os_solaris.cpp revision 61:5a76ab815e34
1/* 2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25// do not include precompiled header file 26# include "incls/_os_solaris.cpp.incl" 27 28// put OS-includes here 29# include <dlfcn.h> 30# include <errno.h> 31# include <link.h> 32# include <poll.h> 33# include <pthread.h> 34# include <pwd.h> 35# include <schedctl.h> 36# include <setjmp.h> 37# include <signal.h> 38# include <stdio.h> 39# include <alloca.h> 40# include <sys/filio.h> 41# include <sys/ipc.h> 42# include <sys/lwp.h> 43# include <sys/machelf.h> // for elf Sym structure used by dladdr1 44# include <sys/mman.h> 45# include <sys/processor.h> 46# include <sys/procset.h> 47# include <sys/pset.h> 48# include <sys/resource.h> 49# include <sys/shm.h> 50# include <sys/socket.h> 51# include <sys/stat.h> 52# include <sys/systeminfo.h> 53# include <sys/time.h> 54# include <sys/times.h> 55# include <sys/types.h> 56# include <sys/wait.h> 57# include <sys/utsname.h> 58# include <thread.h> 59# include <unistd.h> 60# include <sys/priocntl.h> 61# include <sys/rtpriocntl.h> 62# include <sys/tspriocntl.h> 63# include <sys/iapriocntl.h> 64# include <sys/loadavg.h> 65# include <string.h> 66 67# define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 68# include <sys/procfs.h> // see comment in <sys/procfs.h> 69 70#define MAX_PATH (2 * K) 71 72// for timer info max values which include all bits 73#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 74 75#ifdef _GNU_SOURCE 76// See bug #6514594 77extern "C" int madvise(caddr_t, size_t, int); 78extern "C" int memcntl(caddr_t addr, size_t len, int cmd, caddr_t arg, 79 int attr, int mask); 80#endif //_GNU_SOURCE 81 82/* 83 MPSS Changes Start. 84 The JVM binary needs to be built and run on pre-Solaris 9 85 systems, but the constants needed by MPSS are only in Solaris 9 86 header files. They are textually replicated here to allow 87 building on earlier systems. Once building on Solaris 8 is 88 no longer a requirement, these #defines can be replaced by ordinary 89 system .h inclusion. 90 91 In earlier versions of the JDK and Solaris, we used ISM for large pages. 92 But ISM requires shared memory to achieve this and thus has many caveats. 93 MPSS is a fully transparent and is a cleaner way to get large pages. 94 Although we still require keeping ISM for backward compatiblitiy as well as 95 giving the opportunity to use large pages on older systems it is 96 recommended that MPSS be used for Solaris 9 and above. 97 98*/ 99 100#ifndef MC_HAT_ADVISE 101 102struct memcntl_mha { 103 uint_t mha_cmd; /* command(s) */ 104 uint_t mha_flags; 105 size_t mha_pagesize; 106}; 107#define MC_HAT_ADVISE 7 /* advise hat map size */ 108#define MHA_MAPSIZE_VA 0x1 /* set preferred page size */ 109#define MAP_ALIGN 0x200 /* addr specifies alignment */ 110 111#endif 112// MPSS Changes End. 113 114 115// Here are some liblgrp types from sys/lgrp_user.h to be able to 116// compile on older systems without this header file. 117 118#ifndef MADV_ACCESS_LWP 119# define MADV_ACCESS_LWP 7 /* next LWP to access heavily */ 120#endif 121#ifndef MADV_ACCESS_MANY 122# define MADV_ACCESS_MANY 8 /* many processes to access heavily */ 123#endif 124 125// Some more macros from sys/mman.h that are not present in Solaris 8. 126 127#ifndef MAX_MEMINFO_CNT 128/* 129 * info_req request type definitions for meminfo 130 * request types starting with MEMINFO_V are used for Virtual addresses 131 * and should not be mixed with MEMINFO_PLGRP which is targeted for Physical 132 * addresses 133 */ 134# define MEMINFO_SHIFT 16 135# define MEMINFO_MASK (0xFF << MEMINFO_SHIFT) 136# define MEMINFO_VPHYSICAL (0x01 << MEMINFO_SHIFT) /* get physical addr */ 137# define MEMINFO_VLGRP (0x02 << MEMINFO_SHIFT) /* get lgroup */ 138# define MEMINFO_VPAGESIZE (0x03 << MEMINFO_SHIFT) /* size of phys page */ 139# define MEMINFO_VREPLCNT (0x04 << MEMINFO_SHIFT) /* no. of replica */ 140# define MEMINFO_VREPL (0x05 << MEMINFO_SHIFT) /* physical replica */ 141# define MEMINFO_VREPL_LGRP (0x06 << MEMINFO_SHIFT) /* lgrp of replica */ 142# define MEMINFO_PLGRP (0x07 << MEMINFO_SHIFT) /* lgroup for paddr */ 143 144/* maximum number of addresses meminfo() can process at a time */ 145# define MAX_MEMINFO_CNT 256 146 147/* maximum number of request types */ 148# define MAX_MEMINFO_REQ 31 149#endif 150 151// see thr_setprio(3T) for the basis of these numbers 152#define MinimumPriority 0 153#define NormalPriority 64 154#define MaximumPriority 127 155 156// Values for ThreadPriorityPolicy == 1 157int prio_policy1[MaxPriority+1] = { -99999, 0, 16, 32, 48, 64, 158 80, 96, 112, 124, 127 }; 159 160// System parameters used internally 161static clock_t clock_tics_per_sec = 100; 162 163// For diagnostics to print a message once. see run_periodic_checks 164static bool check_addr0_done = false; 165static sigset_t check_signal_done; 166static bool check_signals = true; 167 168address os::Solaris::handler_start; // start pc of thr_sighndlrinfo 169address os::Solaris::handler_end; // end pc of thr_sighndlrinfo 170 171address os::Solaris::_main_stack_base = NULL; // 4352906 workaround 172 173 174// "default" initializers for missing libc APIs 175extern "C" { 176 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 177 static int lwp_mutex_destroy(mutex_t *mx) { return 0; } 178 179 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 180 static int lwp_cond_destroy(cond_t *cv) { return 0; } 181} 182 183// "default" initializers for pthread-based synchronization 184extern "C" { 185 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 186 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 187} 188 189// Thread Local Storage 190// This is common to all Solaris platforms so it is defined here, 191// in this common file. 192// The declarations are in the os_cpu threadLS*.hpp files. 193// 194// Static member initialization for TLS 195Thread* ThreadLocalStorage::_get_thread_cache[ThreadLocalStorage::_pd_cache_size] = {NULL}; 196 197#ifndef PRODUCT 198#define _PCT(n,d) ((100.0*(double)(n))/(double)(d)) 199 200int ThreadLocalStorage::_tcacheHit = 0; 201int ThreadLocalStorage::_tcacheMiss = 0; 202 203void ThreadLocalStorage::print_statistics() { 204 int total = _tcacheMiss+_tcacheHit; 205 tty->print_cr("Thread cache hits %d misses %d total %d percent %f\n", 206 _tcacheHit, _tcacheMiss, total, _PCT(_tcacheHit, total)); 207} 208#undef _PCT 209#endif // PRODUCT 210 211Thread* ThreadLocalStorage::get_thread_via_cache_slowly(uintptr_t raw_id, 212 int index) { 213 Thread *thread = get_thread_slow(); 214 if (thread != NULL) { 215 address sp = os::current_stack_pointer(); 216 guarantee(thread->_stack_base == NULL || 217 (sp <= thread->_stack_base && 218 sp >= thread->_stack_base - thread->_stack_size) || 219 is_error_reported(), 220 "sp must be inside of selected thread stack"); 221 222 thread->_self_raw_id = raw_id; // mark for quick retrieval 223 _get_thread_cache[ index ] = thread; 224 } 225 return thread; 226} 227 228 229static const double all_zero[ sizeof(Thread) / sizeof(double) + 1 ] = {0}; 230#define NO_CACHED_THREAD ((Thread*)all_zero) 231 232void ThreadLocalStorage::pd_set_thread(Thread* thread) { 233 234 // Store the new value before updating the cache to prevent a race 235 // between get_thread_via_cache_slowly() and this store operation. 236 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread); 237 238 // Update thread cache with new thread if setting on thread create, 239 // or NO_CACHED_THREAD (zeroed) thread if resetting thread on exit. 240 uintptr_t raw = pd_raw_thread_id(); 241 int ix = pd_cache_index(raw); 242 _get_thread_cache[ix] = thread == NULL ? NO_CACHED_THREAD : thread; 243} 244 245void ThreadLocalStorage::pd_init() { 246 for (int i = 0; i < _pd_cache_size; i++) { 247 _get_thread_cache[i] = NO_CACHED_THREAD; 248 } 249} 250 251// Invalidate all the caches (happens to be the same as pd_init). 252void ThreadLocalStorage::pd_invalidate_all() { pd_init(); } 253 254#undef NO_CACHED_THREAD 255 256// END Thread Local Storage 257 258static inline size_t adjust_stack_size(address base, size_t size) { 259 if ((ssize_t)size < 0) { 260 // 4759953: Compensate for ridiculous stack size. 261 size = max_intx; 262 } 263 if (size > (size_t)base) { 264 // 4812466: Make sure size doesn't allow the stack to wrap the address space. 265 size = (size_t)base; 266 } 267 return size; 268} 269 270static inline stack_t get_stack_info() { 271 stack_t st; 272 int retval = thr_stksegment(&st); 273 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); 274 assert(retval == 0, "incorrect return value from thr_stksegment"); 275 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 276 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 277 return st; 278} 279 280address os::current_stack_base() { 281 int r = thr_main() ; 282 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ; 283 bool is_primordial_thread = r; 284 285 // Workaround 4352906, avoid calls to thr_stksegment by 286 // thr_main after the first one (it looks like we trash 287 // some data, causing the value for ss_sp to be incorrect). 288 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) { 289 stack_t st = get_stack_info(); 290 if (is_primordial_thread) { 291 // cache initial value of stack base 292 os::Solaris::_main_stack_base = (address)st.ss_sp; 293 } 294 return (address)st.ss_sp; 295 } else { 296 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); 297 return os::Solaris::_main_stack_base; 298 } 299} 300 301size_t os::current_stack_size() { 302 size_t size; 303 304 int r = thr_main() ; 305 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ; 306 if(!r) { 307 size = get_stack_info().ss_size; 308 } else { 309 struct rlimit limits; 310 getrlimit(RLIMIT_STACK, &limits); 311 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); 312 } 313 // base may not be page aligned 314 address base = current_stack_base(); 315 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());; 316 return (size_t)(base - bottom); 317} 318 319// interruptible infrastructure 320 321// setup_interruptible saves the thread state before going into an 322// interruptible system call. 323// The saved state is used to restore the thread to 324// its former state whether or not an interrupt is received. 325// Used by classloader os::read 326// hpi calls skip this layer and stay in _thread_in_native 327 328void os::Solaris::setup_interruptible(JavaThread* thread) { 329 330 JavaThreadState thread_state = thread->thread_state(); 331 332 assert(thread_state != _thread_blocked, "Coming from the wrong thread"); 333 assert(thread_state != _thread_in_native, "Native threads skip setup_interruptible"); 334 OSThread* osthread = thread->osthread(); 335 osthread->set_saved_interrupt_thread_state(thread_state); 336 thread->frame_anchor()->make_walkable(thread); 337 ThreadStateTransition::transition(thread, thread_state, _thread_blocked); 338} 339 340// Version of setup_interruptible() for threads that are already in 341// _thread_blocked. Used by os_sleep(). 342void os::Solaris::setup_interruptible_already_blocked(JavaThread* thread) { 343 thread->frame_anchor()->make_walkable(thread); 344} 345 346JavaThread* os::Solaris::setup_interruptible() { 347 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread(); 348 setup_interruptible(thread); 349 return thread; 350} 351 352void os::Solaris::try_enable_extended_io() { 353 typedef int (*enable_extended_FILE_stdio_t)(int, int); 354 355 if (!UseExtendedFileIO) { 356 return; 357 } 358 359 enable_extended_FILE_stdio_t enabler = 360 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT, 361 "enable_extended_FILE_stdio"); 362 if (enabler) { 363 enabler(-1, -1); 364 } 365} 366 367 368#ifdef ASSERT 369 370JavaThread* os::Solaris::setup_interruptible_native() { 371 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread(); 372 JavaThreadState thread_state = thread->thread_state(); 373 assert(thread_state == _thread_in_native, "Assumed thread_in_native"); 374 return thread; 375} 376 377void os::Solaris::cleanup_interruptible_native(JavaThread* thread) { 378 JavaThreadState thread_state = thread->thread_state(); 379 assert(thread_state == _thread_in_native, "Assumed thread_in_native"); 380} 381#endif 382 383// cleanup_interruptible reverses the effects of setup_interruptible 384// setup_interruptible_already_blocked() does not need any cleanup. 385 386void os::Solaris::cleanup_interruptible(JavaThread* thread) { 387 OSThread* osthread = thread->osthread(); 388 389 ThreadStateTransition::transition(thread, _thread_blocked, osthread->saved_interrupt_thread_state()); 390} 391 392// I/O interruption related counters called in _INTERRUPTIBLE 393 394void os::Solaris::bump_interrupted_before_count() { 395 RuntimeService::record_interrupted_before_count(); 396} 397 398void os::Solaris::bump_interrupted_during_count() { 399 RuntimeService::record_interrupted_during_count(); 400} 401 402static int _processors_online = 0; 403 404 jint os::Solaris::_os_thread_limit = 0; 405volatile jint os::Solaris::_os_thread_count = 0; 406 407julong os::available_memory() { 408 return Solaris::available_memory(); 409} 410 411julong os::Solaris::available_memory() { 412 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); 413} 414 415julong os::Solaris::_physical_memory = 0; 416 417julong os::physical_memory() { 418 return Solaris::physical_memory(); 419} 420 421julong os::allocatable_physical_memory(julong size) { 422#ifdef _LP64 423 return size; 424#else 425 julong result = MIN2(size, (julong)3835*M); 426 if (!is_allocatable(result)) { 427 // Memory allocations will be aligned but the alignment 428 // is not known at this point. Alignments will 429 // be at most to LargePageSizeInBytes. Protect 430 // allocations from alignments up to illegal 431 // values. If at this point 2G is illegal. 432 julong reasonable_size = (julong)2*G - 2 * LargePageSizeInBytes; 433 result = MIN2(size, reasonable_size); 434 } 435 return result; 436#endif 437} 438 439static hrtime_t first_hrtime = 0; 440static const hrtime_t hrtime_hz = 1000*1000*1000; 441const int LOCK_BUSY = 1; 442const int LOCK_FREE = 0; 443const int LOCK_INVALID = -1; 444static volatile hrtime_t max_hrtime = 0; 445static volatile int max_hrtime_lock = LOCK_FREE; // Update counter with LSB as lock-in-progress 446 447 448void os::Solaris::initialize_system_info() { 449 _processor_count = sysconf(_SC_NPROCESSORS_CONF); 450 _processors_online = sysconf (_SC_NPROCESSORS_ONLN); 451 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE); 452} 453 454int os::active_processor_count() { 455 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 456 pid_t pid = getpid(); 457 psetid_t pset = PS_NONE; 458 // Are we running in a processor set? 459 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) { 460 if (pset != PS_NONE) { 461 uint_t pset_cpus; 462 // Query number of cpus in processor set 463 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) { 464 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check"); 465 _processors_online = pset_cpus; 466 return pset_cpus; 467 } 468 } 469 } 470 // Otherwise return number of online cpus 471 return online_cpus; 472} 473 474static bool find_processors_in_pset(psetid_t pset, 475 processorid_t** id_array, 476 uint_t* id_length) { 477 bool result = false; 478 // Find the number of processors in the processor set. 479 if (pset_info(pset, NULL, id_length, NULL) == 0) { 480 // Make up an array to hold their ids. 481 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length); 482 // Fill in the array with their processor ids. 483 if (pset_info(pset, NULL, id_length, *id_array) == 0) { 484 result = true; 485 } 486 } 487 return result; 488} 489 490// Callers of find_processors_online() must tolerate imprecise results -- 491// the system configuration can change asynchronously because of DR 492// or explicit psradm operations. 493// 494// We also need to take care that the loop (below) terminates as the 495// number of processors online can change between the _SC_NPROCESSORS_ONLN 496// request and the loop that builds the list of processor ids. Unfortunately 497// there's no reliable way to determine the maximum valid processor id, 498// so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online 499// man pages, which claim the processor id set is "sparse, but 500// not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually 501// exit the loop. 502// 503// In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's 504// not available on S8.0. 505 506static bool find_processors_online(processorid_t** id_array, 507 uint* id_length) { 508 const processorid_t MAX_PROCESSOR_ID = 100000 ; 509 // Find the number of processors online. 510 *id_length = sysconf(_SC_NPROCESSORS_ONLN); 511 // Make up an array to hold their ids. 512 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length); 513 // Processors need not be numbered consecutively. 514 long found = 0; 515 processorid_t next = 0; 516 while (found < *id_length && next < MAX_PROCESSOR_ID) { 517 processor_info_t info; 518 if (processor_info(next, &info) == 0) { 519 // NB, PI_NOINTR processors are effectively online ... 520 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) { 521 (*id_array)[found] = next; 522 found += 1; 523 } 524 } 525 next += 1; 526 } 527 if (found < *id_length) { 528 // The loop above didn't identify the expected number of processors. 529 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN) 530 // and re-running the loop, above, but there's no guarantee of progress 531 // if the system configuration is in flux. Instead, we just return what 532 // we've got. Note that in the worst case find_processors_online() could 533 // return an empty set. (As a fall-back in the case of the empty set we 534 // could just return the ID of the current processor). 535 *id_length = found ; 536 } 537 538 return true; 539} 540 541static bool assign_distribution(processorid_t* id_array, 542 uint id_length, 543 uint* distribution, 544 uint distribution_length) { 545 // We assume we can assign processorid_t's to uint's. 546 assert(sizeof(processorid_t) == sizeof(uint), 547 "can't convert processorid_t to uint"); 548 // Quick check to see if we won't succeed. 549 if (id_length < distribution_length) { 550 return false; 551 } 552 // Assign processor ids to the distribution. 553 // Try to shuffle processors to distribute work across boards, 554 // assuming 4 processors per board. 555 const uint processors_per_board = ProcessDistributionStride; 556 // Find the maximum processor id. 557 processorid_t max_id = 0; 558 for (uint m = 0; m < id_length; m += 1) { 559 max_id = MAX2(max_id, id_array[m]); 560 } 561 // The next id, to limit loops. 562 const processorid_t limit_id = max_id + 1; 563 // Make up markers for available processors. 564 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id); 565 for (uint c = 0; c < limit_id; c += 1) { 566 available_id[c] = false; 567 } 568 for (uint a = 0; a < id_length; a += 1) { 569 available_id[id_array[a]] = true; 570 } 571 // Step by "boards", then by "slot", copying to "assigned". 572 // NEEDS_CLEANUP: The assignment of processors should be stateful, 573 // remembering which processors have been assigned by 574 // previous calls, etc., so as to distribute several 575 // independent calls of this method. What we'd like is 576 // It would be nice to have an API that let us ask 577 // how many processes are bound to a processor, 578 // but we don't have that, either. 579 // In the short term, "board" is static so that 580 // subsequent distributions don't all start at board 0. 581 static uint board = 0; 582 uint assigned = 0; 583 // Until we've found enough processors .... 584 while (assigned < distribution_length) { 585 // ... find the next available processor in the board. 586 for (uint slot = 0; slot < processors_per_board; slot += 1) { 587 uint try_id = board * processors_per_board + slot; 588 if ((try_id < limit_id) && (available_id[try_id] == true)) { 589 distribution[assigned] = try_id; 590 available_id[try_id] = false; 591 assigned += 1; 592 break; 593 } 594 } 595 board += 1; 596 if (board * processors_per_board + 0 >= limit_id) { 597 board = 0; 598 } 599 } 600 if (available_id != NULL) { 601 FREE_C_HEAP_ARRAY(bool, available_id); 602 } 603 return true; 604} 605 606bool os::distribute_processes(uint length, uint* distribution) { 607 bool result = false; 608 // Find the processor id's of all the available CPUs. 609 processorid_t* id_array = NULL; 610 uint id_length = 0; 611 // There are some races between querying information and using it, 612 // since processor sets can change dynamically. 613 psetid_t pset = PS_NONE; 614 // Are we running in a processor set? 615 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) { 616 result = find_processors_in_pset(pset, &id_array, &id_length); 617 } else { 618 result = find_processors_online(&id_array, &id_length); 619 } 620 if (result == true) { 621 if (id_length >= length) { 622 result = assign_distribution(id_array, id_length, distribution, length); 623 } else { 624 result = false; 625 } 626 } 627 if (id_array != NULL) { 628 FREE_C_HEAP_ARRAY(processorid_t, id_array); 629 } 630 return result; 631} 632 633bool os::bind_to_processor(uint processor_id) { 634 // We assume that a processorid_t can be stored in a uint. 635 assert(sizeof(uint) == sizeof(processorid_t), 636 "can't convert uint to processorid_t"); 637 int bind_result = 638 processor_bind(P_LWPID, // bind LWP. 639 P_MYID, // bind current LWP. 640 (processorid_t) processor_id, // id. 641 NULL); // don't return old binding. 642 return (bind_result == 0); 643} 644 645bool os::getenv(const char* name, char* buffer, int len) { 646 char* val = ::getenv( name ); 647 if ( val == NULL 648 || strlen(val) + 1 > len ) { 649 if (len > 0) buffer[0] = 0; // return a null string 650 return false; 651 } 652 strcpy( buffer, val ); 653 return true; 654} 655 656 657// Return true if user is running as root. 658 659bool os::have_special_privileges() { 660 static bool init = false; 661 static bool privileges = false; 662 if (!init) { 663 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 664 init = true; 665 } 666 return privileges; 667} 668 669 670static char* get_property(char* name, char* buffer, int buffer_size) { 671 if (os::getenv(name, buffer, buffer_size)) { 672 return buffer; 673 } 674 static char empty[] = ""; 675 return empty; 676} 677 678 679void os::init_system_properties_values() { 680 char arch[12]; 681 sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); 682 683 // The next steps are taken in the product version: 684 // 685 // Obtain the JAVA_HOME value from the location of libjvm[_g].so. 686 // This library should be located at: 687 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm[_g].so. 688 // 689 // If "/jre/lib/" appears at the right place in the path, then we 690 // assume libjvm[_g].so is installed in a JDK and we use this path. 691 // 692 // Otherwise exit with message: "Could not create the Java virtual machine." 693 // 694 // The following extra steps are taken in the debugging version: 695 // 696 // If "/jre/lib/" does NOT appear at the right place in the path 697 // instead of exit check for $JAVA_HOME environment variable. 698 // 699 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 700 // then we append a fake suffix "hotspot/libjvm[_g].so" to this path so 701 // it looks like libjvm[_g].so is installed there 702 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm[_g].so. 703 // 704 // Otherwise exit. 705 // 706 // Important note: if the location of libjvm.so changes this 707 // code needs to be changed accordingly. 708 709 // The next few definitions allow the code to be verbatim: 710#define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n)) 711#define free(p) FREE_C_HEAP_ARRAY(char, p) 712#define getenv(n) ::getenv(n) 713 714#define EXTENSIONS_DIR "/lib/ext" 715#define ENDORSED_DIR "/lib/endorsed" 716#define COMMON_DIR "/usr/jdk/packages" 717 718 { 719 /* sysclasspath, java_home, dll_dir */ 720 { 721 char *home_path; 722 char *dll_path; 723 char *pslash; 724 char buf[MAXPATHLEN]; 725 os::jvm_path(buf, sizeof(buf)); 726 727 // Found the full path to libjvm.so. 728 // Now cut the path to <java_home>/jre if we can. 729 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ 730 pslash = strrchr(buf, '/'); 731 if (pslash != NULL) 732 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ 733 dll_path = malloc(strlen(buf) + 1); 734 if (dll_path == NULL) 735 return; 736 strcpy(dll_path, buf); 737 Arguments::set_dll_dir(dll_path); 738 739 if (pslash != NULL) { 740 pslash = strrchr(buf, '/'); 741 if (pslash != NULL) { 742 *pslash = '\0'; /* get rid of /<arch> */ 743 pslash = strrchr(buf, '/'); 744 if (pslash != NULL) 745 *pslash = '\0'; /* get rid of /lib */ 746 } 747 } 748 749 home_path = malloc(strlen(buf) + 1); 750 if (home_path == NULL) 751 return; 752 strcpy(home_path, buf); 753 Arguments::set_java_home(home_path); 754 755 if (!set_boot_path('/', ':')) 756 return; 757 } 758 759 /* 760 * Where to look for native libraries 761 */ 762 { 763 // Use dlinfo() to determine the correct java.library.path. 764 // 765 // If we're launched by the Java launcher, and the user 766 // does not set java.library.path explicitly on the commandline, 767 // the Java launcher sets LD_LIBRARY_PATH for us and unsets 768 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case 769 // dlinfo returns LD_LIBRARY_PATH + crle settings (including 770 // /usr/lib), which is exactly what we want. 771 // 772 // If the user does set java.library.path, it completely 773 // overwrites this setting, and always has. 774 // 775 // If we're not launched by the Java launcher, we may 776 // get here with any/all of the LD_LIBRARY_PATH[_32|64] 777 // settings. Again, dlinfo does exactly what we want. 778 779 Dl_serinfo _info, *info = &_info; 780 Dl_serpath *path; 781 char* library_path; 782 char *common_path; 783 int i; 784 785 // determine search path count and required buffer size 786 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) { 787 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror()); 788 } 789 790 // allocate new buffer and initialize 791 info = (Dl_serinfo*)malloc(_info.dls_size); 792 if (info == NULL) { 793 vm_exit_out_of_memory(_info.dls_size, 794 "init_system_properties_values info"); 795 } 796 info->dls_size = _info.dls_size; 797 info->dls_cnt = _info.dls_cnt; 798 799 // obtain search path information 800 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) { 801 free(info); 802 vm_exit_during_initialization("dlinfo SERINFO request", dlerror()); 803 } 804 805 path = &info->dls_serpath[0]; 806 807 // Note: Due to a legacy implementation, most of the library path 808 // is set in the launcher. This was to accomodate linking restrictions 809 // on legacy Solaris implementations (which are no longer supported). 810 // Eventually, all the library path setting will be done here. 811 // 812 // However, to prevent the proliferation of improperly built native 813 // libraries, the new path component /usr/jdk/packages is added here. 814 815 // Determine the actual CPU architecture. 816 char cpu_arch[12]; 817 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 818#ifdef _LP64 819 // If we are a 64-bit vm, perform the following translations: 820 // sparc -> sparcv9 821 // i386 -> amd64 822 if (strcmp(cpu_arch, "sparc") == 0) 823 strcat(cpu_arch, "v9"); 824 else if (strcmp(cpu_arch, "i386") == 0) 825 strcpy(cpu_arch, "amd64"); 826#endif 827 828 // Construct the invariant part of ld_library_path. Note that the 829 // space for the colon and the trailing null are provided by the 830 // nulls included by the sizeof operator. 831 size_t bufsize = sizeof(COMMON_DIR) + sizeof("/lib/") + strlen(cpu_arch); 832 common_path = malloc(bufsize); 833 if (common_path == NULL) { 834 free(info); 835 vm_exit_out_of_memory(bufsize, 836 "init_system_properties_values common_path"); 837 } 838 sprintf(common_path, COMMON_DIR "/lib/%s", cpu_arch); 839 840 // struct size is more than sufficient for the path components obtained 841 // through the dlinfo() call, so only add additional space for the path 842 // components explicitly added here. 843 bufsize = info->dls_size + strlen(common_path); 844 library_path = malloc(bufsize); 845 if (library_path == NULL) { 846 free(info); 847 free(common_path); 848 vm_exit_out_of_memory(bufsize, 849 "init_system_properties_values library_path"); 850 } 851 library_path[0] = '\0'; 852 853 // Construct the desired Java library path from the linker's library 854 // search path. 855 // 856 // For compatibility, it is optimal that we insert the additional path 857 // components specific to the Java VM after those components specified 858 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so 859 // infrastructure. 860 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it 861 strcpy(library_path, common_path); 862 } else { 863 int inserted = 0; 864 for (i = 0; i < info->dls_cnt; i++, path++) { 865 uint_t flags = path->dls_flags & LA_SER_MASK; 866 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) { 867 strcat(library_path, common_path); 868 strcat(library_path, os::path_separator()); 869 inserted = 1; 870 } 871 strcat(library_path, path->dls_name); 872 strcat(library_path, os::path_separator()); 873 } 874 // eliminate trailing path separator 875 library_path[strlen(library_path)-1] = '\0'; 876 } 877 878 // happens before argument parsing - can't use a trace flag 879 // tty->print_raw("init_system_properties_values: native lib path: "); 880 // tty->print_raw_cr(library_path); 881 882 // callee copies into its own buffer 883 Arguments::set_library_path(library_path); 884 885 free(common_path); 886 free(library_path); 887 free(info); 888 } 889 890 /* 891 * Extensions directories. 892 * 893 * Note that the space for the colon and the trailing null are provided 894 * by the nulls included by the sizeof operator (so actually one byte more 895 * than necessary is allocated). 896 */ 897 { 898 char *buf = (char *) malloc(strlen(Arguments::get_java_home()) + 899 sizeof(EXTENSIONS_DIR) + sizeof(COMMON_DIR) + 900 sizeof(EXTENSIONS_DIR)); 901 sprintf(buf, "%s" EXTENSIONS_DIR ":" COMMON_DIR EXTENSIONS_DIR, 902 Arguments::get_java_home()); 903 Arguments::set_ext_dirs(buf); 904 } 905 906 /* Endorsed standards default directory. */ 907 { 908 char * buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); 909 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); 910 Arguments::set_endorsed_dirs(buf); 911 } 912 } 913 914#undef malloc 915#undef free 916#undef getenv 917#undef EXTENSIONS_DIR 918#undef ENDORSED_DIR 919#undef COMMON_DIR 920 921} 922 923void os::breakpoint() { 924 BREAKPOINT; 925} 926 927bool os::obsolete_option(const JavaVMOption *option) 928{ 929 if (!strncmp(option->optionString, "-Xt", 3)) { 930 return true; 931 } else if (!strncmp(option->optionString, "-Xtm", 4)) { 932 return true; 933 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) { 934 return true; 935 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) { 936 return true; 937 } 938 return false; 939} 940 941bool os::Solaris::valid_stack_address(Thread* thread, address sp) { 942 address stackStart = (address)thread->stack_base(); 943 address stackEnd = (address)(stackStart - (address)thread->stack_size()); 944 if (sp < stackStart && sp >= stackEnd ) return true; 945 return false; 946} 947 948extern "C" void breakpoint() { 949 // use debugger to set breakpoint here 950} 951 952// Returns an estimate of the current stack pointer. Result must be guaranteed to 953// point into the calling threads stack, and be no lower than the current stack 954// pointer. 955address os::current_stack_pointer() { 956 volatile int dummy; 957 address sp = (address)&dummy + 8; // %%%% need to confirm if this is right 958 return sp; 959} 960 961static thread_t main_thread; 962 963// Thread start routine for all new Java threads 964extern "C" void* java_start(void* thread_addr) { 965 // Try to randomize the cache line index of hot stack frames. 966 // This helps when threads of the same stack traces evict each other's 967 // cache lines. The threads can be either from the same JVM instance, or 968 // from different JVM instances. The benefit is especially true for 969 // processors with hyperthreading technology. 970 static int counter = 0; 971 int pid = os::current_process_id(); 972 alloca(((pid ^ counter++) & 7) * 128); 973 974 int prio; 975 Thread* thread = (Thread*)thread_addr; 976 OSThread* osthr = thread->osthread(); 977 978 osthr->set_lwp_id( _lwp_self() ); // Store lwp in case we are bound 979 thread->_schedctl = (void *) schedctl_init () ; 980 981 if (UseNUMA) { 982 int lgrp_id = os::numa_get_group_id(); 983 if (lgrp_id != -1) { 984 thread->set_lgrp_id(lgrp_id); 985 } 986 } 987 988 // If the creator called set priority before we started, 989 // we need to call set priority now that we have an lwp. 990 // Get the priority from libthread and set the priority 991 // for the new Solaris lwp. 992 if ( osthr->thread_id() != -1 ) { 993 if ( UseThreadPriorities ) { 994 thr_getprio(osthr->thread_id(), &prio); 995 if (ThreadPriorityVerbose) { 996 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT ", setting priority: %d\n", 997 osthr->thread_id(), osthr->lwp_id(), prio ); 998 } 999 os::set_native_priority(thread, prio); 1000 } 1001 } else if (ThreadPriorityVerbose) { 1002 warning("Can't set priority in _start routine, thread id hasn't been set\n"); 1003 } 1004 1005 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 1006 1007 // initialize signal mask for this thread 1008 os::Solaris::hotspot_sigmask(thread); 1009 1010 thread->run(); 1011 1012 // One less thread is executing 1013 // When the VMThread gets here, the main thread may have already exited 1014 // which frees the CodeHeap containing the Atomic::dec code 1015 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 1016 Atomic::dec(&os::Solaris::_os_thread_count); 1017 } 1018 1019 if (UseDetachedThreads) { 1020 thr_exit(NULL); 1021 ShouldNotReachHere(); 1022 } 1023 return NULL; 1024} 1025 1026static OSThread* create_os_thread(Thread* thread, thread_t thread_id) { 1027 // Allocate the OSThread object 1028 OSThread* osthread = new OSThread(NULL, NULL); 1029 if (osthread == NULL) return NULL; 1030 1031 // Store info on the Solaris thread into the OSThread 1032 osthread->set_thread_id(thread_id); 1033 osthread->set_lwp_id(_lwp_self()); 1034 thread->_schedctl = (void *) schedctl_init () ; 1035 1036 if (UseNUMA) { 1037 int lgrp_id = os::numa_get_group_id(); 1038 if (lgrp_id != -1) { 1039 thread->set_lgrp_id(lgrp_id); 1040 } 1041 } 1042 1043 if ( ThreadPriorityVerbose ) { 1044 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n", 1045 osthread->thread_id(), osthread->lwp_id() ); 1046 } 1047 1048 // Initial thread state is INITIALIZED, not SUSPENDED 1049 osthread->set_state(INITIALIZED); 1050 1051 return osthread; 1052} 1053 1054void os::Solaris::hotspot_sigmask(Thread* thread) { 1055 1056 //Save caller's signal mask 1057 sigset_t sigmask; 1058 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask); 1059 OSThread *osthread = thread->osthread(); 1060 osthread->set_caller_sigmask(sigmask); 1061 1062 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL); 1063 if (!ReduceSignalUsage) { 1064 if (thread->is_VM_thread()) { 1065 // Only the VM thread handles BREAK_SIGNAL ... 1066 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL); 1067 } else { 1068 // ... all other threads block BREAK_SIGNAL 1069 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked"); 1070 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL); 1071 } 1072 } 1073} 1074 1075bool os::create_attached_thread(JavaThread* thread) { 1076#ifdef ASSERT 1077 thread->verify_not_published(); 1078#endif 1079 OSThread* osthread = create_os_thread(thread, thr_self()); 1080 if (osthread == NULL) { 1081 return false; 1082 } 1083 1084 // Initial thread state is RUNNABLE 1085 osthread->set_state(RUNNABLE); 1086 thread->set_osthread(osthread); 1087 1088 // initialize signal mask for this thread 1089 // and save the caller's signal mask 1090 os::Solaris::hotspot_sigmask(thread); 1091 1092 return true; 1093} 1094 1095bool os::create_main_thread(JavaThread* thread) { 1096#ifdef ASSERT 1097 thread->verify_not_published(); 1098#endif 1099 if (_starting_thread == NULL) { 1100 _starting_thread = create_os_thread(thread, main_thread); 1101 if (_starting_thread == NULL) { 1102 return false; 1103 } 1104 } 1105 1106 // The primodial thread is runnable from the start 1107 _starting_thread->set_state(RUNNABLE); 1108 1109 thread->set_osthread(_starting_thread); 1110 1111 // initialize signal mask for this thread 1112 // and save the caller's signal mask 1113 os::Solaris::hotspot_sigmask(thread); 1114 1115 return true; 1116} 1117 1118// _T2_libthread is true if we believe we are running with the newer 1119// SunSoft lwp/libthread.so (2.8 patch, 2.9 default) 1120bool os::Solaris::_T2_libthread = false; 1121 1122bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 1123 // Allocate the OSThread object 1124 OSThread* osthread = new OSThread(NULL, NULL); 1125 if (osthread == NULL) { 1126 return false; 1127 } 1128 1129 if ( ThreadPriorityVerbose ) { 1130 char *thrtyp; 1131 switch ( thr_type ) { 1132 case vm_thread: 1133 thrtyp = (char *)"vm"; 1134 break; 1135 case cgc_thread: 1136 thrtyp = (char *)"cgc"; 1137 break; 1138 case pgc_thread: 1139 thrtyp = (char *)"pgc"; 1140 break; 1141 case java_thread: 1142 thrtyp = (char *)"java"; 1143 break; 1144 case compiler_thread: 1145 thrtyp = (char *)"compiler"; 1146 break; 1147 case watcher_thread: 1148 thrtyp = (char *)"watcher"; 1149 break; 1150 default: 1151 thrtyp = (char *)"unknown"; 1152 break; 1153 } 1154 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp); 1155 } 1156 1157 // Calculate stack size if it's not specified by caller. 1158 if (stack_size == 0) { 1159 // The default stack size 1M (2M for LP64). 1160 stack_size = (BytesPerWord >> 2) * K * K; 1161 1162 switch (thr_type) { 1163 case os::java_thread: 1164 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 1165 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create(); 1166 break; 1167 case os::compiler_thread: 1168 if (CompilerThreadStackSize > 0) { 1169 stack_size = (size_t)(CompilerThreadStackSize * K); 1170 break; 1171 } // else fall through: 1172 // use VMThreadStackSize if CompilerThreadStackSize is not defined 1173 case os::vm_thread: 1174 case os::pgc_thread: 1175 case os::cgc_thread: 1176 case os::watcher_thread: 1177 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 1178 break; 1179 } 1180 } 1181 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed); 1182 1183 // Initial state is ALLOCATED but not INITIALIZED 1184 osthread->set_state(ALLOCATED); 1185 1186 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) { 1187 // We got lots of threads. Check if we still have some address space left. 1188 // Need to be at least 5Mb of unreserved address space. We do check by 1189 // trying to reserve some. 1190 const size_t VirtualMemoryBangSize = 20*K*K; 1191 char* mem = os::reserve_memory(VirtualMemoryBangSize); 1192 if (mem == NULL) { 1193 delete osthread; 1194 return false; 1195 } else { 1196 // Release the memory again 1197 os::release_memory(mem, VirtualMemoryBangSize); 1198 } 1199 } 1200 1201 // Setup osthread because the child thread may need it. 1202 thread->set_osthread(osthread); 1203 1204 // Create the Solaris thread 1205 // explicit THR_BOUND for T2_libthread case in case 1206 // that assumption is not accurate, but our alternate signal stack 1207 // handling is based on it which must have bound threads 1208 thread_t tid = 0; 1209 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED 1210 | ((UseBoundThreads || os::Solaris::T2_libthread() || 1211 (thr_type == vm_thread) || 1212 (thr_type == cgc_thread) || 1213 (thr_type == pgc_thread) || 1214 (thr_type == compiler_thread && BackgroundCompilation)) ? 1215 THR_BOUND : 0); 1216 int status; 1217 1218 // 4376845 -- libthread/kernel don't provide enough LWPs to utilize all CPUs. 1219 // 1220 // On multiprocessors systems, libthread sometimes under-provisions our 1221 // process with LWPs. On a 30-way systems, for instance, we could have 1222 // 50 user-level threads in ready state and only 2 or 3 LWPs assigned 1223 // to our process. This can result in under utilization of PEs. 1224 // I suspect the problem is related to libthread's LWP 1225 // pool management and to the kernel's SIGBLOCKING "last LWP parked" 1226 // upcall policy. 1227 // 1228 // The following code is palliative -- it attempts to ensure that our 1229 // process has sufficient LWPs to take advantage of multiple PEs. 1230 // Proper long-term cures include using user-level threads bound to LWPs 1231 // (THR_BOUND) or using LWP-based synchronization. Note that there is a 1232 // slight timing window with respect to sampling _os_thread_count, but 1233 // the race is benign. Also, we should periodically recompute 1234 // _processors_online as the min of SC_NPROCESSORS_ONLN and the 1235 // the number of PEs in our partition. You might be tempted to use 1236 // THR_NEW_LWP here, but I'd recommend against it as that could 1237 // result in undesirable growth of the libthread's LWP pool. 1238 // The fix below isn't sufficient; for instance, it doesn't take into count 1239 // LWPs parked on IO. It does, however, help certain CPU-bound benchmarks. 1240 // 1241 // Some pathologies this scheme doesn't handle: 1242 // * Threads can block, releasing the LWPs. The LWPs can age out. 1243 // When a large number of threads become ready again there aren't 1244 // enough LWPs available to service them. This can occur when the 1245 // number of ready threads oscillates. 1246 // * LWPs/Threads park on IO, thus taking the LWP out of circulation. 1247 // 1248 // Finally, we should call thr_setconcurrency() periodically to refresh 1249 // the LWP pool and thwart the LWP age-out mechanism. 1250 // The "+3" term provides a little slop -- we want to slightly overprovision. 1251 1252 if (AdjustConcurrency && os::Solaris::_os_thread_count < (_processors_online+3)) { 1253 if (!(flags & THR_BOUND)) { 1254 thr_setconcurrency (os::Solaris::_os_thread_count); // avoid starvation 1255 } 1256 } 1257 // Although this doesn't hurt, we should warn of undefined behavior 1258 // when using unbound T1 threads with schedctl(). This should never 1259 // happen, as the compiler and VM threads are always created bound 1260 DEBUG_ONLY( 1261 if ((VMThreadHintNoPreempt || CompilerThreadHintNoPreempt) && 1262 (!os::Solaris::T2_libthread() && (!(flags & THR_BOUND))) && 1263 ((thr_type == vm_thread) || (thr_type == cgc_thread) || 1264 (thr_type == pgc_thread) || (thr_type == compiler_thread && BackgroundCompilation))) { 1265 warning("schedctl behavior undefined when Compiler/VM/GC Threads are Unbound"); 1266 } 1267 ); 1268 1269 1270 // Mark that we don't have an lwp or thread id yet. 1271 // In case we attempt to set the priority before the thread starts. 1272 osthread->set_lwp_id(-1); 1273 osthread->set_thread_id(-1); 1274 1275 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid); 1276 if (status != 0) { 1277 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1278 perror("os::create_thread"); 1279 } 1280 thread->set_osthread(NULL); 1281 // Need to clean up stuff we've allocated so far 1282 delete osthread; 1283 return false; 1284 } 1285 1286 Atomic::inc(&os::Solaris::_os_thread_count); 1287 1288 // Store info on the Solaris thread into the OSThread 1289 osthread->set_thread_id(tid); 1290 1291 // Remember that we created this thread so we can set priority on it 1292 osthread->set_vm_created(); 1293 1294 // Set the default thread priority otherwise use NormalPriority 1295 1296 if ( UseThreadPriorities ) { 1297 thr_setprio(tid, (DefaultThreadPriority == -1) ? 1298 java_to_os_priority[NormPriority] : 1299 DefaultThreadPriority); 1300 } 1301 1302 // Initial thread state is INITIALIZED, not SUSPENDED 1303 osthread->set_state(INITIALIZED); 1304 1305 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 1306 return true; 1307} 1308 1309/* defined for >= Solaris 10. This allows builds on earlier versions 1310 * of Solaris to take advantage of the newly reserved Solaris JVM signals 1311 * With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2 1312 * and -XX:+UseAltSigs does nothing since these should have no conflict 1313 */ 1314#if !defined(SIGJVM1) 1315#define SIGJVM1 39 1316#define SIGJVM2 40 1317#endif 1318 1319debug_only(static bool signal_sets_initialized = false); 1320static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 1321int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL; 1322int os::Solaris::_SIGasync = ASYNC_SIGNAL; 1323 1324bool os::Solaris::is_sig_ignored(int sig) { 1325 struct sigaction oact; 1326 sigaction(sig, (struct sigaction*)NULL, &oact); 1327 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 1328 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 1329 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) 1330 return true; 1331 else 1332 return false; 1333} 1334 1335// Note: SIGRTMIN is a macro that calls sysconf() so it will 1336// dynamically detect SIGRTMIN value for the system at runtime, not buildtime 1337static bool isJVM1available() { 1338 return SIGJVM1 < SIGRTMIN; 1339} 1340 1341void os::Solaris::signal_sets_init() { 1342 // Should also have an assertion stating we are still single-threaded. 1343 assert(!signal_sets_initialized, "Already initialized"); 1344 // Fill in signals that are necessarily unblocked for all threads in 1345 // the VM. Currently, we unblock the following signals: 1346 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 1347 // by -Xrs (=ReduceSignalUsage)); 1348 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 1349 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 1350 // the dispositions or masks wrt these signals. 1351 // Programs embedding the VM that want to use the above signals for their 1352 // own purposes must, at this time, use the "-Xrs" option to prevent 1353 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 1354 // (See bug 4345157, and other related bugs). 1355 // In reality, though, unblocking these signals is really a nop, since 1356 // these signals are not blocked by default. 1357 sigemptyset(&unblocked_sigs); 1358 sigemptyset(&allowdebug_blocked_sigs); 1359 sigaddset(&unblocked_sigs, SIGILL); 1360 sigaddset(&unblocked_sigs, SIGSEGV); 1361 sigaddset(&unblocked_sigs, SIGBUS); 1362 sigaddset(&unblocked_sigs, SIGFPE); 1363 1364 if (isJVM1available) { 1365 os::Solaris::set_SIGinterrupt(SIGJVM1); 1366 os::Solaris::set_SIGasync(SIGJVM2); 1367 } else if (UseAltSigs) { 1368 os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL); 1369 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL); 1370 } else { 1371 os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL); 1372 os::Solaris::set_SIGasync(ASYNC_SIGNAL); 1373 } 1374 1375 sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt()); 1376 sigaddset(&unblocked_sigs, os::Solaris::SIGasync()); 1377 1378 if (!ReduceSignalUsage) { 1379 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 1380 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 1381 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 1382 } 1383 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 1384 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 1385 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 1386 } 1387 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 1388 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 1389 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 1390 } 1391 } 1392 // Fill in signals that are blocked by all but the VM thread. 1393 sigemptyset(&vm_sigs); 1394 if (!ReduceSignalUsage) 1395 sigaddset(&vm_sigs, BREAK_SIGNAL); 1396 debug_only(signal_sets_initialized = true); 1397 1398 // For diagnostics only used in run_periodic_checks 1399 sigemptyset(&check_signal_done); 1400} 1401 1402// These are signals that are unblocked while a thread is running Java. 1403// (For some reason, they get blocked by default.) 1404sigset_t* os::Solaris::unblocked_signals() { 1405 assert(signal_sets_initialized, "Not initialized"); 1406 return &unblocked_sigs; 1407} 1408 1409// These are the signals that are blocked while a (non-VM) thread is 1410// running Java. Only the VM thread handles these signals. 1411sigset_t* os::Solaris::vm_signals() { 1412 assert(signal_sets_initialized, "Not initialized"); 1413 return &vm_sigs; 1414} 1415 1416// These are signals that are blocked during cond_wait to allow debugger in 1417sigset_t* os::Solaris::allowdebug_blocked_signals() { 1418 assert(signal_sets_initialized, "Not initialized"); 1419 return &allowdebug_blocked_sigs; 1420} 1421 1422// First crack at OS-specific initialization, from inside the new thread. 1423void os::initialize_thread() { 1424 int r = thr_main() ; 1425 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ; 1426 if (r) { 1427 JavaThread* jt = (JavaThread *)Thread::current(); 1428 assert(jt != NULL,"Sanity check"); 1429 size_t stack_size; 1430 address base = jt->stack_base(); 1431 if (Arguments::created_by_java_launcher()) { 1432 // Use 2MB to allow for Solaris 7 64 bit mode. 1433 stack_size = JavaThread::stack_size_at_create() == 0 1434 ? 2048*K : JavaThread::stack_size_at_create(); 1435 1436 // There are rare cases when we may have already used more than 1437 // the basic stack size allotment before this method is invoked. 1438 // Attempt to allow for a normally sized java_stack. 1439 size_t current_stack_offset = (size_t)(base - (address)&stack_size); 1440 stack_size += ReservedSpace::page_align_size_down(current_stack_offset); 1441 } else { 1442 // 6269555: If we were not created by a Java launcher, i.e. if we are 1443 // running embedded in a native application, treat the primordial thread 1444 // as much like a native attached thread as possible. This means using 1445 // the current stack size from thr_stksegment(), unless it is too large 1446 // to reliably setup guard pages. A reasonable max size is 8MB. 1447 size_t current_size = current_stack_size(); 1448 // This should never happen, but just in case.... 1449 if (current_size == 0) current_size = 2 * K * K; 1450 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size; 1451 } 1452 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());; 1453 stack_size = (size_t)(base - bottom); 1454 1455 assert(stack_size > 0, "Stack size calculation problem"); 1456 1457 if (stack_size > jt->stack_size()) { 1458 NOT_PRODUCT( 1459 struct rlimit limits; 1460 getrlimit(RLIMIT_STACK, &limits); 1461 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur); 1462 assert(size >= jt->stack_size(), "Stack size problem in main thread"); 1463 ) 1464 tty->print_cr( 1465 "Stack size of %d Kb exceeds current limit of %d Kb.\n" 1466 "(Stack sizes are rounded up to a multiple of the system page size.)\n" 1467 "See limit(1) to increase the stack size limit.", 1468 stack_size / K, jt->stack_size() / K); 1469 vm_exit(1); 1470 } 1471 assert(jt->stack_size() >= stack_size, 1472 "Attempt to map more stack than was allocated"); 1473 jt->set_stack_size(stack_size); 1474 } 1475 1476 // 5/22/01: Right now alternate signal stacks do not handle 1477 // throwing stack overflow exceptions, see bug 4463178 1478 // Until a fix is found for this, T2 will NOT imply alternate signal 1479 // stacks. 1480 // If using T2 libthread threads, install an alternate signal stack. 1481 // Because alternate stacks associate with LWPs on Solaris, 1482 // see sigaltstack(2), if using UNBOUND threads, or if UseBoundThreads 1483 // we prefer to explicitly stack bang. 1484 // If not using T2 libthread, but using UseBoundThreads any threads 1485 // (primordial thread, jni_attachCurrentThread) we do not create, 1486 // probably are not bound, therefore they can not have an alternate 1487 // signal stack. Since our stack banging code is generated and 1488 // is shared across threads, all threads must be bound to allow 1489 // using alternate signal stacks. The alternative is to interpose 1490 // on _lwp_create to associate an alt sig stack with each LWP, 1491 // and this could be a problem when the JVM is embedded. 1492 // We would prefer to use alternate signal stacks with T2 1493 // Since there is currently no accurate way to detect T2 1494 // we do not. Assuming T2 when running T1 causes sig 11s or assertions 1495 // on installing alternate signal stacks 1496 1497 1498 // 05/09/03: removed alternate signal stack support for Solaris 1499 // The alternate signal stack mechanism is no longer needed to 1500 // handle stack overflow. This is now handled by allocating 1501 // guard pages (red zone) and stackbanging. 1502 // Initially the alternate signal stack mechanism was removed because 1503 // it did not work with T1 llibthread. Alternate 1504 // signal stacks MUST have all threads bound to lwps. Applications 1505 // can create their own threads and attach them without their being 1506 // bound under T1. This is frequently the case for the primordial thread. 1507 // If we were ever to reenable this mechanism we would need to 1508 // use the dynamic check for T2 libthread. 1509 1510 os::Solaris::init_thread_fpu_state(); 1511} 1512 1513 1514 1515// Free Solaris resources related to the OSThread 1516void os::free_thread(OSThread* osthread) { 1517 assert(osthread != NULL, "os::free_thread but osthread not set"); 1518 1519 1520 // We are told to free resources of the argument thread, 1521 // but we can only really operate on the current thread. 1522 // The main thread must take the VMThread down synchronously 1523 // before the main thread exits and frees up CodeHeap 1524 guarantee((Thread::current()->osthread() == osthread 1525 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread"); 1526 if (Thread::current()->osthread() == osthread) { 1527 // Restore caller's signal mask 1528 sigset_t sigmask = osthread->caller_sigmask(); 1529 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL); 1530 } 1531 delete osthread; 1532} 1533 1534void os::pd_start_thread(Thread* thread) { 1535 int status = thr_continue(thread->osthread()->thread_id()); 1536 assert_status(status == 0, status, "thr_continue failed"); 1537} 1538 1539 1540intx os::current_thread_id() { 1541 return (intx)thr_self(); 1542} 1543 1544static pid_t _initial_pid = 0; 1545 1546int os::current_process_id() { 1547 return (int)(_initial_pid ? _initial_pid : getpid()); 1548} 1549 1550int os::allocate_thread_local_storage() { 1551 // %%% in Win32 this allocates a memory segment pointed to by a 1552 // register. Dan Stein can implement a similar feature in 1553 // Solaris. Alternatively, the VM can do the same thing 1554 // explicitly: malloc some storage and keep the pointer in a 1555 // register (which is part of the thread's context) (or keep it 1556 // in TLS). 1557 // %%% In current versions of Solaris, thr_self and TSD can 1558 // be accessed via short sequences of displaced indirections. 1559 // The value of thr_self is available as %g7(36). 1560 // The value of thr_getspecific(k) is stored in %g7(12)(4)(k*4-4), 1561 // assuming that the current thread already has a value bound to k. 1562 // It may be worth experimenting with such access patterns, 1563 // and later having the parameters formally exported from a Solaris 1564 // interface. I think, however, that it will be faster to 1565 // maintain the invariant that %g2 always contains the 1566 // JavaThread in Java code, and have stubs simply 1567 // treat %g2 as a caller-save register, preserving it in a %lN. 1568 thread_key_t tk; 1569 if (thr_keycreate( &tk, NULL ) ) 1570 fatal1("os::allocate_thread_local_storage: thr_keycreate failed (%s)", strerror(errno)); 1571 return int(tk); 1572} 1573 1574void os::free_thread_local_storage(int index) { 1575 // %%% don't think we need anything here 1576 // if ( pthread_key_delete((pthread_key_t) tk) ) 1577 // fatal("os::free_thread_local_storage: pthread_key_delete failed"); 1578} 1579 1580#define SMALLINT 32 // libthread allocate for tsd_common is a version specific 1581 // small number - point is NO swap space available 1582void os::thread_local_storage_at_put(int index, void* value) { 1583 // %%% this is used only in threadLocalStorage.cpp 1584 if (thr_setspecific((thread_key_t)index, value)) { 1585 if (errno == ENOMEM) { 1586 vm_exit_out_of_memory(SMALLINT, "thr_setspecific: out of swap space"); 1587 } else { 1588 fatal1("os::thread_local_storage_at_put: thr_setspecific failed (%s)", strerror(errno)); 1589 } 1590 } else { 1591 ThreadLocalStorage::set_thread_in_slot ((Thread *) value) ; 1592 } 1593} 1594 1595// This function could be called before TLS is initialized, for example, when 1596// VM receives an async signal or when VM causes a fatal error during 1597// initialization. Return NULL if thr_getspecific() fails. 1598void* os::thread_local_storage_at(int index) { 1599 // %%% this is used only in threadLocalStorage.cpp 1600 void* r = NULL; 1601 return thr_getspecific((thread_key_t)index, &r) != 0 ? NULL : r; 1602} 1603 1604 1605const int NANOSECS_PER_MILLISECS = 1000000; 1606// gethrtime can move backwards if read from one cpu and then a different cpu 1607// getTimeNanos is guaranteed to not move backward on Solaris 1608// local spinloop created as faster for a CAS on an int than 1609// a CAS on a 64bit jlong. Also Atomic::cmpxchg for jlong is not 1610// supported on sparc v8 or pre supports_cx8 intel boxes. 1611// oldgetTimeNanos for systems which do not support CAS on 64bit jlong 1612// i.e. sparc v8 and pre supports_cx8 (i486) intel boxes 1613inline hrtime_t oldgetTimeNanos() { 1614 int gotlock = LOCK_INVALID; 1615 hrtime_t newtime = gethrtime(); 1616 1617 for (;;) { 1618// grab lock for max_hrtime 1619 int curlock = max_hrtime_lock; 1620 if (curlock & LOCK_BUSY) continue; 1621 if (gotlock = Atomic::cmpxchg(LOCK_BUSY, &max_hrtime_lock, LOCK_FREE) != LOCK_FREE) continue; 1622 if (newtime > max_hrtime) { 1623 max_hrtime = newtime; 1624 } else { 1625 newtime = max_hrtime; 1626 } 1627 // release lock 1628 max_hrtime_lock = LOCK_FREE; 1629 return newtime; 1630 } 1631} 1632// gethrtime can move backwards if read from one cpu and then a different cpu 1633// getTimeNanos is guaranteed to not move backward on Solaris 1634inline hrtime_t getTimeNanos() { 1635 if (VM_Version::supports_cx8()) { 1636 bool retry = false; 1637 hrtime_t newtime = gethrtime(); 1638 hrtime_t oldmaxtime = max_hrtime; 1639 hrtime_t retmaxtime = oldmaxtime; 1640 while ((newtime > retmaxtime) && (retry == false || retmaxtime != oldmaxtime)) { 1641 oldmaxtime = retmaxtime; 1642 retmaxtime = Atomic::cmpxchg(newtime, (volatile jlong *)&max_hrtime, oldmaxtime); 1643 retry = true; 1644 } 1645 return (newtime > retmaxtime) ? newtime : retmaxtime; 1646 } else { 1647 return oldgetTimeNanos(); 1648 } 1649} 1650 1651// Time since start-up in seconds to a fine granularity. 1652// Used by VMSelfDestructTimer and the MemProfiler. 1653double os::elapsedTime() { 1654 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1655} 1656 1657jlong os::elapsed_counter() { 1658 return (jlong)(getTimeNanos() - first_hrtime); 1659} 1660 1661jlong os::elapsed_frequency() { 1662 return hrtime_hz; 1663} 1664 1665// Return the real, user, and system times in seconds from an 1666// arbitrary fixed point in the past. 1667bool os::getTimesSecs(double* process_real_time, 1668 double* process_user_time, 1669 double* process_system_time) { 1670 struct tms ticks; 1671 clock_t real_ticks = times(&ticks); 1672 1673 if (real_ticks == (clock_t) (-1)) { 1674 return false; 1675 } else { 1676 double ticks_per_second = (double) clock_tics_per_sec; 1677 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1678 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1679 // For consistency return the real time from getTimeNanos() 1680 // converted to seconds. 1681 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); 1682 1683 return true; 1684 } 1685} 1686 1687// Used internally for comparisons only 1688// getTimeMillis guaranteed to not move backwards on Solaris 1689jlong getTimeMillis() { 1690 jlong nanotime = getTimeNanos(); 1691 return (jlong)(nanotime / NANOSECS_PER_MILLISECS); 1692} 1693 1694// Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 1695jlong os::javaTimeMillis() { 1696 timeval t; 1697 if (gettimeofday( &t, NULL) == -1) 1698 fatal1("os::javaTimeMillis: gettimeofday (%s)", strerror(errno)); 1699 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; 1700} 1701 1702jlong os::javaTimeNanos() { 1703 return (jlong)getTimeNanos(); 1704} 1705 1706void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1707 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits 1708 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1709 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1710 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1711} 1712 1713char * os::local_time_string(char *buf, size_t buflen) { 1714 struct tm t; 1715 time_t long_time; 1716 time(&long_time); 1717 localtime_r(&long_time, &t); 1718 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1719 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1720 t.tm_hour, t.tm_min, t.tm_sec); 1721 return buf; 1722} 1723 1724// Note: os::shutdown() might be called very early during initialization, or 1725// called from signal handler. Before adding something to os::shutdown(), make 1726// sure it is async-safe and can handle partially initialized VM. 1727void os::shutdown() { 1728 1729 // allow PerfMemory to attempt cleanup of any persistent resources 1730 perfMemory_exit(); 1731 1732 // needs to remove object in file system 1733 AttachListener::abort(); 1734 1735 // flush buffered output, finish log files 1736 ostream_abort(); 1737 1738 // Check for abort hook 1739 abort_hook_t abort_hook = Arguments::abort_hook(); 1740 if (abort_hook != NULL) { 1741 abort_hook(); 1742 } 1743} 1744 1745// Note: os::abort() might be called very early during initialization, or 1746// called from signal handler. Before adding something to os::abort(), make 1747// sure it is async-safe and can handle partially initialized VM. 1748void os::abort(bool dump_core) { 1749 os::shutdown(); 1750 if (dump_core) { 1751#ifndef PRODUCT 1752 fdStream out(defaultStream::output_fd()); 1753 out.print_raw("Current thread is "); 1754 char buf[16]; 1755 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1756 out.print_raw_cr(buf); 1757 out.print_raw_cr("Dumping core ..."); 1758#endif 1759 ::abort(); // dump core (for debugging) 1760 } 1761 1762 ::exit(1); 1763} 1764 1765// Die immediately, no exit hook, no abort hook, no cleanup. 1766void os::die() { 1767 _exit(-1); 1768} 1769 1770// unused 1771void os::set_error_file(const char *logfile) {} 1772 1773// DLL functions 1774 1775const char* os::dll_file_extension() { return ".so"; } 1776 1777const char* os::get_temp_directory() { return "/tmp/"; } 1778 1779const char* os::get_current_directory(char *buf, int buflen) { 1780 return getcwd(buf, buflen); 1781} 1782 1783// check if addr is inside libjvm[_g].so 1784bool os::address_is_in_vm(address addr) { 1785 static address libjvm_base_addr; 1786 Dl_info dlinfo; 1787 1788 if (libjvm_base_addr == NULL) { 1789 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); 1790 libjvm_base_addr = (address)dlinfo.dli_fbase; 1791 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1792 } 1793 1794 if (dladdr((void *)addr, &dlinfo)) { 1795 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1796 } 1797 1798 return false; 1799} 1800 1801typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int); 1802static dladdr1_func_type dladdr1_func = NULL; 1803 1804bool os::dll_address_to_function_name(address addr, char *buf, 1805 int buflen, int * offset) { 1806 Dl_info dlinfo; 1807 1808 // dladdr1_func was initialized in os::init() 1809 if (dladdr1_func){ 1810 // yes, we have dladdr1 1811 1812 // Support for dladdr1 is checked at runtime; it may be 1813 // available even if the vm is built on a machine that does 1814 // not have dladdr1 support. Make sure there is a value for 1815 // RTLD_DL_SYMENT. 1816 #ifndef RTLD_DL_SYMENT 1817 #define RTLD_DL_SYMENT 1 1818 #endif 1819 Sym * info; 1820 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1821 RTLD_DL_SYMENT)) { 1822 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1823 if (offset) *offset = addr - (address)dlinfo.dli_saddr; 1824 1825 // check if the returned symbol really covers addr 1826 return ((char *)dlinfo.dli_saddr + info->st_size > (char *)addr); 1827 } else { 1828 if (buf) buf[0] = '\0'; 1829 if (offset) *offset = -1; 1830 return false; 1831 } 1832 } else { 1833 // no, only dladdr is available 1834 if(dladdr((void *)addr, &dlinfo)) { 1835 if (buf) jio_snprintf(buf, buflen, dlinfo.dli_sname); 1836 if (offset) *offset = addr - (address)dlinfo.dli_saddr; 1837 return true; 1838 } else { 1839 if (buf) buf[0] = '\0'; 1840 if (offset) *offset = -1; 1841 return false; 1842 } 1843 } 1844} 1845 1846bool os::dll_address_to_library_name(address addr, char* buf, 1847 int buflen, int* offset) { 1848 Dl_info dlinfo; 1849 1850 if (dladdr((void*)addr, &dlinfo)){ 1851 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1852 if (offset) *offset = addr - (address)dlinfo.dli_fbase; 1853 return true; 1854 } else { 1855 if (buf) buf[0] = '\0'; 1856 if (offset) *offset = -1; 1857 return false; 1858 } 1859} 1860 1861// Prints the names and full paths of all opened dynamic libraries 1862// for current process 1863void os::print_dll_info(outputStream * st) { 1864 Dl_info dli; 1865 void *handle; 1866 Link_map *map; 1867 Link_map *p; 1868 1869 st->print_cr("Dynamic libraries:"); st->flush(); 1870 1871 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { 1872 st->print_cr("Error: Cannot print dynamic libraries."); 1873 return; 1874 } 1875 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1876 if (handle == NULL) { 1877 st->print_cr("Error: Cannot print dynamic libraries."); 1878 return; 1879 } 1880 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1881 if (map == NULL) { 1882 st->print_cr("Error: Cannot print dynamic libraries."); 1883 return; 1884 } 1885 1886 while (map->l_prev != NULL) 1887 map = map->l_prev; 1888 1889 while (map != NULL) { 1890 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); 1891 map = map->l_next; 1892 } 1893 1894 dlclose(handle); 1895} 1896 1897 // Loads .dll/.so and 1898 // in case of error it checks if .dll/.so was built for the 1899 // same architecture as Hotspot is running on 1900 1901void * os::dll_load(const char *filename, char *ebuf, int ebuflen) 1902{ 1903 void * result= ::dlopen(filename, RTLD_LAZY); 1904 if (result != NULL) { 1905 // Successful loading 1906 return result; 1907 } 1908 1909 Elf32_Ehdr elf_head; 1910 1911 // Read system error message into ebuf 1912 // It may or may not be overwritten below 1913 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1914 ebuf[ebuflen-1]='\0'; 1915 int diag_msg_max_length=ebuflen-strlen(ebuf); 1916 char* diag_msg_buf=ebuf+strlen(ebuf); 1917 1918 if (diag_msg_max_length==0) { 1919 // No more space in ebuf for additional diagnostics message 1920 return NULL; 1921 } 1922 1923 1924 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1925 1926 if (file_descriptor < 0) { 1927 // Can't open library, report dlerror() message 1928 return NULL; 1929 } 1930 1931 bool failed_to_read_elf_head= 1932 (sizeof(elf_head)!= 1933 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; 1934 1935 ::close(file_descriptor); 1936 if (failed_to_read_elf_head) { 1937 // file i/o error - report dlerror() msg 1938 return NULL; 1939 } 1940 1941 typedef struct { 1942 Elf32_Half code; // Actual value as defined in elf.h 1943 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1944 char elf_class; // 32 or 64 bit 1945 char endianess; // MSB or LSB 1946 char* name; // String representation 1947 } arch_t; 1948 1949 static const arch_t arch_array[]={ 1950 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1951 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1952 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1953 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1954 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1955 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1956 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1957 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1958 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"} 1959 }; 1960 1961 #if (defined IA32) 1962 static Elf32_Half running_arch_code=EM_386; 1963 #elif (defined AMD64) 1964 static Elf32_Half running_arch_code=EM_X86_64; 1965 #elif (defined IA64) 1966 static Elf32_Half running_arch_code=EM_IA_64; 1967 #elif (defined __sparc) && (defined _LP64) 1968 static Elf32_Half running_arch_code=EM_SPARCV9; 1969 #elif (defined __sparc) && (!defined _LP64) 1970 static Elf32_Half running_arch_code=EM_SPARC; 1971 #elif (defined __powerpc64__) 1972 static Elf32_Half running_arch_code=EM_PPC64; 1973 #elif (defined __powerpc__) 1974 static Elf32_Half running_arch_code=EM_PPC; 1975 #else 1976 #error Method os::dll_load requires that one of following is defined:\ 1977 IA32, AMD64, IA64, __sparc, __powerpc__ 1978 #endif 1979 1980 // Identify compatability class for VM's architecture and library's architecture 1981 // Obtain string descriptions for architectures 1982 1983 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1984 int running_arch_index=-1; 1985 1986 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { 1987 if (running_arch_code == arch_array[i].code) { 1988 running_arch_index = i; 1989 } 1990 if (lib_arch.code == arch_array[i].code) { 1991 lib_arch.compat_class = arch_array[i].compat_class; 1992 lib_arch.name = arch_array[i].name; 1993 } 1994 } 1995 1996 assert(running_arch_index != -1, 1997 "Didn't find running architecture code (running_arch_code) in arch_array"); 1998 if (running_arch_index == -1) { 1999 // Even though running architecture detection failed 2000 // we may still continue with reporting dlerror() message 2001 return NULL; 2002 } 2003 2004 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 2005 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 2006 return NULL; 2007 } 2008 2009 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 2010 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 2011 return NULL; 2012 } 2013 2014 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 2015 if ( lib_arch.name!=NULL ) { 2016 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 2017 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 2018 lib_arch.name, arch_array[running_arch_index].name); 2019 } else { 2020 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 2021 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 2022 lib_arch.code, 2023 arch_array[running_arch_index].name); 2024 } 2025 } 2026 2027 return NULL; 2028} 2029 2030 2031 2032bool _print_ascii_file(const char* filename, outputStream* st) { 2033 int fd = open(filename, O_RDONLY); 2034 if (fd == -1) { 2035 return false; 2036 } 2037 2038 char buf[32]; 2039 int bytes; 2040 while ((bytes = read(fd, buf, sizeof(buf))) > 0) { 2041 st->print_raw(buf, bytes); 2042 } 2043 2044 close(fd); 2045 2046 return true; 2047} 2048 2049void os::print_os_info(outputStream* st) { 2050 st->print("OS:"); 2051 2052 if (!_print_ascii_file("/etc/release", st)) { 2053 st->print("Solaris"); 2054 } 2055 st->cr(); 2056 2057 // kernel 2058 st->print("uname:"); 2059 struct utsname name; 2060 uname(&name); 2061 st->print(name.sysname); st->print(" "); 2062 st->print(name.release); st->print(" "); 2063 st->print(name.version); st->print(" "); 2064 st->print(name.machine); 2065 2066 // libthread 2067 if (os::Solaris::T2_libthread()) st->print(" (T2 libthread)"); 2068 else st->print(" (T1 libthread)"); 2069 st->cr(); 2070 2071 // rlimit 2072 st->print("rlimit:"); 2073 struct rlimit rlim; 2074 2075 st->print(" STACK "); 2076 getrlimit(RLIMIT_STACK, &rlim); 2077 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2078 else st->print("%uk", rlim.rlim_cur >> 10); 2079 2080 st->print(", CORE "); 2081 getrlimit(RLIMIT_CORE, &rlim); 2082 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2083 else st->print("%uk", rlim.rlim_cur >> 10); 2084 2085 st->print(", NOFILE "); 2086 getrlimit(RLIMIT_NOFILE, &rlim); 2087 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2088 else st->print("%d", rlim.rlim_cur); 2089 2090 st->print(", AS "); 2091 getrlimit(RLIMIT_AS, &rlim); 2092 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2093 else st->print("%uk", rlim.rlim_cur >> 10); 2094 st->cr(); 2095 2096 // load average 2097 st->print("load average:"); 2098 double loadavg[3]; 2099 os::loadavg(loadavg, 3); 2100 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); 2101 st->cr(); 2102} 2103 2104 2105static bool check_addr0(outputStream* st) { 2106 jboolean status = false; 2107 int fd = open("/proc/self/map",O_RDONLY); 2108 if (fd >= 0) { 2109 prmap_t p; 2110 while(read(fd, &p, sizeof(p)) > 0) { 2111 if (p.pr_vaddr == 0x0) { 2112 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname); 2113 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname); 2114 st->print("Access:"); 2115 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-"); 2116 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-"); 2117 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-"); 2118 st->cr(); 2119 status = true; 2120 } 2121 close(fd); 2122 } 2123 } 2124 return status; 2125} 2126 2127void os::print_memory_info(outputStream* st) { 2128 st->print("Memory:"); 2129 st->print(" %dk page", os::vm_page_size()>>10); 2130 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 2131 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 2132 st->cr(); 2133 (void) check_addr0(st); 2134} 2135 2136// Taken from /usr/include/sys/machsig.h Supposed to be architecture specific 2137// but they're the same for all the solaris architectures that we support. 2138const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", 2139 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", 2140 "ILL_COPROC", "ILL_BADSTK" }; 2141 2142const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", 2143 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", 2144 "FPE_FLTINV", "FPE_FLTSUB" }; 2145 2146const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; 2147 2148const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; 2149 2150void os::print_siginfo(outputStream* st, void* siginfo) { 2151 st->print("siginfo:"); 2152 2153 const int buflen = 100; 2154 char buf[buflen]; 2155 siginfo_t *si = (siginfo_t*)siginfo; 2156 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); 2157 char *err = strerror(si->si_errno); 2158 if (si->si_errno != 0 && err != NULL) { 2159 st->print("si_errno=%s", err); 2160 } else { 2161 st->print("si_errno=%d", si->si_errno); 2162 } 2163 const int c = si->si_code; 2164 assert(c > 0, "unexpected si_code"); 2165 switch (si->si_signo) { 2166 case SIGILL: 2167 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); 2168 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2169 break; 2170 case SIGFPE: 2171 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); 2172 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2173 break; 2174 case SIGSEGV: 2175 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); 2176 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2177 break; 2178 case SIGBUS: 2179 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); 2180 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2181 break; 2182 default: 2183 st->print(", si_code=%d", si->si_code); 2184 // no si_addr 2185 } 2186 2187 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && 2188 UseSharedSpaces) { 2189 FileMapInfo* mapinfo = FileMapInfo::current_info(); 2190 if (mapinfo->is_in_shared_space(si->si_addr)) { 2191 st->print("\n\nError accessing class data sharing archive." \ 2192 " Mapped file inaccessible during execution, " \ 2193 " possible disk/network problem."); 2194 } 2195 } 2196 st->cr(); 2197} 2198 2199// Moved from whole group, because we need them here for diagnostic 2200// prints. 2201#define OLDMAXSIGNUM 32 2202static int Maxsignum = 0; 2203static int *ourSigFlags = NULL; 2204 2205extern "C" void sigINTRHandler(int, siginfo_t*, void*); 2206 2207int os::Solaris::get_our_sigflags(int sig) { 2208 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 2209 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 2210 return ourSigFlags[sig]; 2211} 2212 2213void os::Solaris::set_our_sigflags(int sig, int flags) { 2214 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 2215 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 2216 ourSigFlags[sig] = flags; 2217} 2218 2219 2220static const char* get_signal_handler_name(address handler, 2221 char* buf, int buflen) { 2222 int offset; 2223 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 2224 if (found) { 2225 // skip directory names 2226 const char *p1, *p2; 2227 p1 = buf; 2228 size_t len = strlen(os::file_separator()); 2229 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 2230 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 2231 } else { 2232 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 2233 } 2234 return buf; 2235} 2236 2237static void print_signal_handler(outputStream* st, int sig, 2238 char* buf, size_t buflen) { 2239 struct sigaction sa; 2240 2241 sigaction(sig, NULL, &sa); 2242 2243 st->print("%s: ", os::exception_name(sig, buf, buflen)); 2244 2245 address handler = (sa.sa_flags & SA_SIGINFO) 2246 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 2247 : CAST_FROM_FN_PTR(address, sa.sa_handler); 2248 2249 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 2250 st->print("SIG_DFL"); 2251 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 2252 st->print("SIG_IGN"); 2253 } else { 2254 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 2255 } 2256 2257 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); 2258 2259 address rh = VMError::get_resetted_sighandler(sig); 2260 // May be, handler was resetted by VMError? 2261 if(rh != NULL) { 2262 handler = rh; 2263 sa.sa_flags = VMError::get_resetted_sigflags(sig); 2264 } 2265 2266 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); 2267 2268 // Check: is it our handler? 2269 if(handler == CAST_FROM_FN_PTR(address, signalHandler) || 2270 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) { 2271 // It is our signal handler 2272 // check for flags 2273 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 2274 st->print( 2275 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 2276 os::Solaris::get_our_sigflags(sig)); 2277 } 2278 } 2279 st->cr(); 2280} 2281 2282void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 2283 st->print_cr("Signal Handlers:"); 2284 print_signal_handler(st, SIGSEGV, buf, buflen); 2285 print_signal_handler(st, SIGBUS , buf, buflen); 2286 print_signal_handler(st, SIGFPE , buf, buflen); 2287 print_signal_handler(st, SIGPIPE, buf, buflen); 2288 print_signal_handler(st, SIGXFSZ, buf, buflen); 2289 print_signal_handler(st, SIGILL , buf, buflen); 2290 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); 2291 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 2292 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 2293 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 2294 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 2295 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 2296 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen); 2297 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen); 2298} 2299 2300static char saved_jvm_path[MAXPATHLEN] = { 0 }; 2301 2302// Find the full path to the current module, libjvm.so or libjvm_g.so 2303void os::jvm_path(char *buf, jint buflen) { 2304 // Error checking. 2305 if (buflen < MAXPATHLEN) { 2306 assert(false, "must use a large-enough buffer"); 2307 buf[0] = '\0'; 2308 return; 2309 } 2310 // Lazy resolve the path to current module. 2311 if (saved_jvm_path[0] != 0) { 2312 strcpy(buf, saved_jvm_path); 2313 return; 2314 } 2315 2316 Dl_info dlinfo; 2317 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 2318 assert(ret != 0, "cannot locate libjvm"); 2319 realpath((char *)dlinfo.dli_fname, buf); 2320 2321 if (strcmp(Arguments::sun_java_launcher(), "gamma") == 0) { 2322 // Support for the gamma launcher. Typical value for buf is 2323 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at 2324 // the right place in the string, then assume we are installed in a JDK and 2325 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix 2326 // up the path so it looks like libjvm.so is installed there (append a 2327 // fake suffix hotspot/libjvm.so). 2328 const char *p = buf + strlen(buf) - 1; 2329 for (int count = 0; p > buf && count < 5; ++count) { 2330 for (--p; p > buf && *p != '/'; --p) 2331 /* empty */ ; 2332 } 2333 2334 if (strncmp(p, "/jre/lib/", 9) != 0) { 2335 // Look for JAVA_HOME in the environment. 2336 char* java_home_var = ::getenv("JAVA_HOME"); 2337 if (java_home_var != NULL && java_home_var[0] != 0) { 2338 char cpu_arch[12]; 2339 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 2340#ifdef _LP64 2341 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9. 2342 if (strcmp(cpu_arch, "sparc") == 0) { 2343 strcat(cpu_arch, "v9"); 2344 } else if (strcmp(cpu_arch, "i386") == 0) { 2345 strcpy(cpu_arch, "amd64"); 2346 } 2347#endif 2348 // Check the current module name "libjvm.so" or "libjvm_g.so". 2349 p = strrchr(buf, '/'); 2350 assert(strstr(p, "/libjvm") == p, "invalid library name"); 2351 p = strstr(p, "_g") ? "_g" : ""; 2352 2353 realpath(java_home_var, buf); 2354 sprintf(buf + strlen(buf), "/jre/lib/%s", cpu_arch); 2355 if (0 == access(buf, F_OK)) { 2356 // Use current module name "libjvm[_g].so" instead of 2357 // "libjvm"debug_only("_g")".so" since for fastdebug version 2358 // we should have "libjvm.so" but debug_only("_g") adds "_g"! 2359 // It is used when we are choosing the HPI library's name 2360 // "libhpi[_g].so" in hpi::initialize_get_interface(). 2361 sprintf(buf + strlen(buf), "/hotspot/libjvm%s.so", p); 2362 } else { 2363 // Go back to path of .so 2364 realpath((char *)dlinfo.dli_fname, buf); 2365 } 2366 } 2367 } 2368 } 2369 2370 strcpy(saved_jvm_path, buf); 2371} 2372 2373 2374void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2375 // no prefix required, not even "_" 2376} 2377 2378 2379void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2380 // no suffix required 2381} 2382 2383 2384// sun.misc.Signal 2385 2386extern "C" { 2387 static void UserHandler(int sig, void *siginfo, void *context) { 2388 // Ctrl-C is pressed during error reporting, likely because the error 2389 // handler fails to abort. Let VM die immediately. 2390 if (sig == SIGINT && is_error_reported()) { 2391 os::die(); 2392 } 2393 2394 os::signal_notify(sig); 2395 // We do not need to reinstate the signal handler each time... 2396 } 2397} 2398 2399void* os::user_handler() { 2400 return CAST_FROM_FN_PTR(void*, UserHandler); 2401} 2402 2403extern "C" { 2404 typedef void (*sa_handler_t)(int); 2405 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2406} 2407 2408void* os::signal(int signal_number, void* handler) { 2409 struct sigaction sigAct, oldSigAct; 2410 sigfillset(&(sigAct.sa_mask)); 2411 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 2412 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2413 2414 if (sigaction(signal_number, &sigAct, &oldSigAct)) 2415 // -1 means registration failed 2416 return (void *)-1; 2417 2418 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2419} 2420 2421void os::signal_raise(int signal_number) { 2422 raise(signal_number); 2423} 2424 2425/* 2426 * The following code is moved from os.cpp for making this 2427 * code platform specific, which it is by its very nature. 2428 */ 2429 2430// a counter for each possible signal value 2431static int Sigexit = 0; 2432static int Maxlibjsigsigs; 2433static jint *pending_signals = NULL; 2434static int *preinstalled_sigs = NULL; 2435static struct sigaction *chainedsigactions = NULL; 2436static sema_t sig_sem; 2437typedef int (*version_getting_t)(); 2438version_getting_t os::Solaris::get_libjsig_version = NULL; 2439static int libjsigversion = NULL; 2440 2441int os::sigexitnum_pd() { 2442 assert(Sigexit > 0, "signal memory not yet initialized"); 2443 return Sigexit; 2444} 2445 2446void os::Solaris::init_signal_mem() { 2447 // Initialize signal structures 2448 Maxsignum = SIGRTMAX; 2449 Sigexit = Maxsignum+1; 2450 assert(Maxsignum >0, "Unable to obtain max signal number"); 2451 2452 Maxlibjsigsigs = Maxsignum; 2453 2454 // pending_signals has one int per signal 2455 // The additional signal is for SIGEXIT - exit signal to signal_thread 2456 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1)); 2457 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 2458 2459 if (UseSignalChaining) { 2460 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 2461 * (Maxsignum + 1)); 2462 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 2463 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1)); 2464 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 2465 } 2466 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 )); 2467 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 2468} 2469 2470void os::signal_init_pd() { 2471 int ret; 2472 2473 ret = ::sema_init(&sig_sem, 0, NULL, NULL); 2474 assert(ret == 0, "sema_init() failed"); 2475} 2476 2477void os::signal_notify(int signal_number) { 2478 int ret; 2479 2480 Atomic::inc(&pending_signals[signal_number]); 2481 ret = ::sema_post(&sig_sem); 2482 assert(ret == 0, "sema_post() failed"); 2483} 2484 2485static int check_pending_signals(bool wait_for_signal) { 2486 int ret; 2487 while (true) { 2488 for (int i = 0; i < Sigexit + 1; i++) { 2489 jint n = pending_signals[i]; 2490 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2491 return i; 2492 } 2493 } 2494 if (!wait_for_signal) { 2495 return -1; 2496 } 2497 JavaThread *thread = JavaThread::current(); 2498 ThreadBlockInVM tbivm(thread); 2499 2500 bool threadIsSuspended; 2501 do { 2502 thread->set_suspend_equivalent(); 2503 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2504 while((ret = ::sema_wait(&sig_sem)) == EINTR) 2505 ; 2506 assert(ret == 0, "sema_wait() failed"); 2507 2508 // were we externally suspended while we were waiting? 2509 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2510 if (threadIsSuspended) { 2511 // 2512 // The semaphore has been incremented, but while we were waiting 2513 // another thread suspended us. We don't want to continue running 2514 // while suspended because that would surprise the thread that 2515 // suspended us. 2516 // 2517 ret = ::sema_post(&sig_sem); 2518 assert(ret == 0, "sema_post() failed"); 2519 2520 thread->java_suspend_self(); 2521 } 2522 } while (threadIsSuspended); 2523 } 2524} 2525 2526int os::signal_lookup() { 2527 return check_pending_signals(false); 2528} 2529 2530int os::signal_wait() { 2531 return check_pending_signals(true); 2532} 2533 2534//////////////////////////////////////////////////////////////////////////////// 2535// Virtual Memory 2536 2537static int page_size = -1; 2538 2539// The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will 2540// clear this var if support is not available. 2541static bool has_map_align = true; 2542 2543int os::vm_page_size() { 2544 assert(page_size != -1, "must call os::init"); 2545 return page_size; 2546} 2547 2548// Solaris allocates memory by pages. 2549int os::vm_allocation_granularity() { 2550 assert(page_size != -1, "must call os::init"); 2551 return page_size; 2552} 2553 2554bool os::commit_memory(char* addr, size_t bytes) { 2555 size_t size = bytes; 2556 return 2557 NULL != Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, 2558 PROT_READ | PROT_WRITE | PROT_EXEC); 2559} 2560 2561bool os::commit_memory(char* addr, size_t bytes, size_t alignment_hint) { 2562 if (commit_memory(addr, bytes)) { 2563 if (UseMPSS && alignment_hint > (size_t)vm_page_size()) { 2564 // If the large page size has been set and the VM 2565 // is using large pages, use the large page size 2566 // if it is smaller than the alignment hint. This is 2567 // a case where the VM wants to use a larger alignment size 2568 // for its own reasons but still want to use large pages 2569 // (which is what matters to setting the mpss range. 2570 size_t page_size = 0; 2571 if (large_page_size() < alignment_hint) { 2572 assert(UseLargePages, "Expected to be here for large page use only"); 2573 page_size = large_page_size(); 2574 } else { 2575 // If the alignment hint is less than the large page 2576 // size, the VM wants a particular alignment (thus the hint) 2577 // for internal reasons. Try to set the mpss range using 2578 // the alignment_hint. 2579 page_size = alignment_hint; 2580 } 2581 // Since this is a hint, ignore any failures. 2582 (void)Solaris::set_mpss_range(addr, bytes, page_size); 2583 } 2584 return true; 2585 } 2586 return false; 2587} 2588 2589// Uncommit the pages in a specified region. 2590void os::free_memory(char* addr, size_t bytes) { 2591 if (madvise(addr, bytes, MADV_FREE) < 0) { 2592 debug_only(warning("MADV_FREE failed.")); 2593 return; 2594 } 2595} 2596 2597// Change the page size in a given range. 2598void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2599 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2600 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2601 Solaris::set_mpss_range(addr, bytes, alignment_hint); 2602} 2603 2604// Tell the OS to make the range local to the first-touching LWP 2605void os::numa_make_local(char *addr, size_t bytes) { 2606 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2607 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2608 debug_only(warning("MADV_ACCESS_LWP failed.")); 2609 } 2610} 2611 2612// Tell the OS that this range would be accessed from different LWPs. 2613void os::numa_make_global(char *addr, size_t bytes) { 2614 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2615 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2616 debug_only(warning("MADV_ACCESS_MANY failed.")); 2617 } 2618} 2619 2620// Get the number of the locality groups. 2621size_t os::numa_get_groups_num() { 2622 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2623 return n != -1 ? n : 1; 2624} 2625 2626// Get a list of leaf locality groups. A leaf lgroup is group that 2627// doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2628// board. An LWP is assigned to one of these groups upon creation. 2629size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2630 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2631 ids[0] = 0; 2632 return 1; 2633 } 2634 int result_size = 0, top = 1, bottom = 0, cur = 0; 2635 for (int k = 0; k < size; k++) { 2636 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2637 (Solaris::lgrp_id_t*)&ids[top], size - top); 2638 if (r == -1) { 2639 ids[0] = 0; 2640 return 1; 2641 } 2642 if (!r) { 2643 assert (bottom <= cur, "Sanity check"); 2644 ids[bottom++] = ids[cur]; 2645 } 2646 top += r; 2647 cur++; 2648 } 2649 return bottom; 2650} 2651 2652// Detect the topology change. Typically happens during CPU pluggin-unplugging. 2653bool os::numa_topology_changed() { 2654 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2655 if (is_stale != -1 && is_stale) { 2656 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2657 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2658 assert(c != 0, "Failure to initialize LGRP API"); 2659 Solaris::set_lgrp_cookie(c); 2660 return true; 2661 } 2662 return false; 2663} 2664 2665// Get the group id of the current LWP. 2666int os::numa_get_group_id() { 2667 int lgrp_id = os::Solaris::lgrp_home(P_LWPID, P_MYID); 2668 if (lgrp_id == -1) { 2669 return 0; 2670 } 2671 return lgrp_id; 2672} 2673 2674// Request information about the page. 2675bool os::get_page_info(char *start, page_info* info) { 2676 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2677 uint64_t addr = (uintptr_t)start; 2678 uint64_t outdata[2]; 2679 uint_t validity = 0; 2680 2681 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2682 return false; 2683 } 2684 2685 info->size = 0; 2686 info->lgrp_id = -1; 2687 2688 if ((validity & 1) != 0) { 2689 if ((validity & 2) != 0) { 2690 info->lgrp_id = outdata[0]; 2691 } 2692 if ((validity & 4) != 0) { 2693 info->size = outdata[1]; 2694 } 2695 return true; 2696 } 2697 return false; 2698} 2699 2700// Scan the pages from start to end until a page different than 2701// the one described in the info parameter is encountered. 2702char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2703 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2704 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2705 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT]; 2706 uint_t validity[MAX_MEMINFO_CNT]; 2707 2708 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2709 uint64_t p = (uint64_t)start; 2710 while (p < (uint64_t)end) { 2711 addrs[0] = p; 2712 size_t addrs_count = 1; 2713 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] < (uint64_t)end) { 2714 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2715 addrs_count++; 2716 } 2717 2718 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2719 return NULL; 2720 } 2721 2722 size_t i = 0; 2723 for (; i < addrs_count; i++) { 2724 if ((validity[i] & 1) != 0) { 2725 if ((validity[i] & 4) != 0) { 2726 if (outdata[types * i + 1] != page_expected->size) { 2727 break; 2728 } 2729 } else 2730 if (page_expected->size != 0) { 2731 break; 2732 } 2733 2734 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2735 if (outdata[types * i] != page_expected->lgrp_id) { 2736 break; 2737 } 2738 } 2739 } else { 2740 return NULL; 2741 } 2742 } 2743 2744 if (i != addrs_count) { 2745 if ((validity[i] & 2) != 0) { 2746 page_found->lgrp_id = outdata[types * i]; 2747 } else { 2748 page_found->lgrp_id = -1; 2749 } 2750 if ((validity[i] & 4) != 0) { 2751 page_found->size = outdata[types * i + 1]; 2752 } else { 2753 page_found->size = 0; 2754 } 2755 return (char*)addrs[i]; 2756 } 2757 2758 p = addrs[addrs_count - 1] + page_size; 2759 } 2760 return end; 2761} 2762 2763bool os::uncommit_memory(char* addr, size_t bytes) { 2764 size_t size = bytes; 2765 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2766 // uncommitted page. Otherwise, the read/write might succeed if we 2767 // have enough swap space to back the physical page. 2768 return 2769 NULL != Solaris::mmap_chunk(addr, size, 2770 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2771 PROT_NONE); 2772} 2773 2774char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2775 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2776 2777 if (b == MAP_FAILED) { 2778 return NULL; 2779 } 2780 return b; 2781} 2782 2783char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) { 2784 char* addr = requested_addr; 2785 int flags = MAP_PRIVATE | MAP_NORESERVE; 2786 2787 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap"); 2788 2789 if (fixed) { 2790 flags |= MAP_FIXED; 2791 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) { 2792 flags |= MAP_ALIGN; 2793 addr = (char*) alignment_hint; 2794 } 2795 2796 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2797 // uncommitted page. Otherwise, the read/write might succeed if we 2798 // have enough swap space to back the physical page. 2799 return mmap_chunk(addr, bytes, flags, PROT_NONE); 2800} 2801 2802char* os::reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { 2803 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL)); 2804 2805 guarantee(requested_addr == NULL || requested_addr == addr, 2806 "OS failed to return requested mmap address."); 2807 return addr; 2808} 2809 2810// Reserve memory at an arbitrary address, only if that area is 2811// available (and not reserved for something else). 2812 2813char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2814 const int max_tries = 10; 2815 char* base[max_tries]; 2816 size_t size[max_tries]; 2817 2818 // Solaris adds a gap between mmap'ed regions. The size of the gap 2819 // is dependent on the requested size and the MMU. Our initial gap 2820 // value here is just a guess and will be corrected later. 2821 bool had_top_overlap = false; 2822 bool have_adjusted_gap = false; 2823 size_t gap = 0x400000; 2824 2825 // Assert only that the size is a multiple of the page size, since 2826 // that's all that mmap requires, and since that's all we really know 2827 // about at this low abstraction level. If we need higher alignment, 2828 // we can either pass an alignment to this method or verify alignment 2829 // in one of the methods further up the call chain. See bug 5044738. 2830 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2831 2832 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 2833 // Give it a try, if the kernel honors the hint we can return immediately. 2834 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 2835 volatile int err = errno; 2836 if (addr == requested_addr) { 2837 return addr; 2838 } else if (addr != NULL) { 2839 unmap_memory(addr, bytes); 2840 } 2841 2842 if (PrintMiscellaneous && Verbose) { 2843 char buf[256]; 2844 buf[0] = '\0'; 2845 if (addr == NULL) { 2846 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err)); 2847 } 2848 warning("attempt_reserve_memory_at: couldn't reserve %d bytes at " 2849 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT 2850 "%s", bytes, requested_addr, addr, buf); 2851 } 2852 2853 // Address hint method didn't work. Fall back to the old method. 2854 // In theory, once SNV becomes our oldest supported platform, this 2855 // code will no longer be needed. 2856 // 2857 // Repeatedly allocate blocks until the block is allocated at the 2858 // right spot. Give up after max_tries. 2859 int i; 2860 for (i = 0; i < max_tries; ++i) { 2861 base[i] = reserve_memory(bytes); 2862 2863 if (base[i] != NULL) { 2864 // Is this the block we wanted? 2865 if (base[i] == requested_addr) { 2866 size[i] = bytes; 2867 break; 2868 } 2869 2870 // check that the gap value is right 2871 if (had_top_overlap && !have_adjusted_gap) { 2872 size_t actual_gap = base[i-1] - base[i] - bytes; 2873 if (gap != actual_gap) { 2874 // adjust the gap value and retry the last 2 allocations 2875 assert(i > 0, "gap adjustment code problem"); 2876 have_adjusted_gap = true; // adjust the gap only once, just in case 2877 gap = actual_gap; 2878 if (PrintMiscellaneous && Verbose) { 2879 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap); 2880 } 2881 unmap_memory(base[i], bytes); 2882 unmap_memory(base[i-1], size[i-1]); 2883 i-=2; 2884 continue; 2885 } 2886 } 2887 2888 // Does this overlap the block we wanted? Give back the overlapped 2889 // parts and try again. 2890 // 2891 // There is still a bug in this code: if top_overlap == bytes, 2892 // the overlap is offset from requested region by the value of gap. 2893 // In this case giving back the overlapped part will not work, 2894 // because we'll give back the entire block at base[i] and 2895 // therefore the subsequent allocation will not generate a new gap. 2896 // This could be fixed with a new algorithm that used larger 2897 // or variable size chunks to find the requested region - 2898 // but such a change would introduce additional complications. 2899 // It's rare enough that the planets align for this bug, 2900 // so we'll just wait for a fix for 6204603/5003415 which 2901 // will provide a mmap flag to allow us to avoid this business. 2902 2903 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2904 if (top_overlap >= 0 && top_overlap < bytes) { 2905 had_top_overlap = true; 2906 unmap_memory(base[i], top_overlap); 2907 base[i] += top_overlap; 2908 size[i] = bytes - top_overlap; 2909 } else { 2910 size_t bottom_overlap = base[i] + bytes - requested_addr; 2911 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2912 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) { 2913 warning("attempt_reserve_memory_at: possible alignment bug"); 2914 } 2915 unmap_memory(requested_addr, bottom_overlap); 2916 size[i] = bytes - bottom_overlap; 2917 } else { 2918 size[i] = bytes; 2919 } 2920 } 2921 } 2922 } 2923 2924 // Give back the unused reserved pieces. 2925 2926 for (int j = 0; j < i; ++j) { 2927 if (base[j] != NULL) { 2928 unmap_memory(base[j], size[j]); 2929 } 2930 } 2931 2932 return (i < max_tries) ? requested_addr : NULL; 2933} 2934 2935bool os::release_memory(char* addr, size_t bytes) { 2936 size_t size = bytes; 2937 return munmap(addr, size) == 0; 2938} 2939 2940static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 2941 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()), 2942 "addr must be page aligned"); 2943 int retVal = mprotect(addr, bytes, prot); 2944 return retVal == 0; 2945} 2946 2947// Protect memory (make it read-only. (Used to pass readonly pages through 2948// JNI GetArray<type>Elements with empty arrays.) 2949bool os::protect_memory(char* addr, size_t bytes) { 2950 return solaris_mprotect(addr, bytes, PROT_READ); 2951} 2952 2953// guard_memory and unguard_memory only happens within stack guard pages. 2954// Since ISM pertains only to the heap, guard and unguard memory should not 2955/// happen with an ISM region. 2956bool os::guard_memory(char* addr, size_t bytes) { 2957 return solaris_mprotect(addr, bytes, PROT_NONE); 2958} 2959 2960bool os::unguard_memory(char* addr, size_t bytes) { 2961 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE|PROT_EXEC); 2962} 2963 2964// Large page support 2965 2966// UseLargePages is the master flag to enable/disable large page memory. 2967// UseMPSS and UseISM are supported for compatibility reasons. Their combined 2968// effects can be described in the following table: 2969// 2970// UseLargePages UseMPSS UseISM 2971// false * * => UseLargePages is the master switch, turning 2972// it off will turn off both UseMPSS and 2973// UseISM. VM will not use large page memory 2974// regardless the settings of UseMPSS/UseISM. 2975// true false false => Unless future Solaris provides other 2976// mechanism to use large page memory, this 2977// combination is equivalent to -UseLargePages, 2978// VM will not use large page memory 2979// true true false => JVM will use MPSS for large page memory. 2980// This is the default behavior. 2981// true false true => JVM will use ISM for large page memory. 2982// true true true => JVM will use ISM if it is available. 2983// Otherwise, JVM will fall back to MPSS. 2984// Becaues ISM is now available on all 2985// supported Solaris versions, this combination 2986// is equivalent to +UseISM -UseMPSS. 2987 2988typedef int (*getpagesizes_func_type) (size_t[], int); 2989static size_t _large_page_size = 0; 2990 2991bool os::Solaris::ism_sanity_check(bool warn, size_t * page_size) { 2992 // x86 uses either 2M or 4M page, depending on whether PAE (Physical Address 2993 // Extensions) mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. Sparc 2994 // can support multiple page sizes. 2995 2996 // Don't bother to probe page size because getpagesizes() comes with MPSS. 2997 // ISM is only recommended on old Solaris where there is no MPSS support. 2998 // Simply choose a conservative value as default. 2999 *page_size = LargePageSizeInBytes ? LargePageSizeInBytes : 3000 SPARC_ONLY(4 * M) IA32_ONLY(4 * M) AMD64_ONLY(2 * M); 3001 3002 // ISM is available on all supported Solaris versions 3003 return true; 3004} 3005 3006// Insertion sort for small arrays (descending order). 3007static void insertion_sort_descending(size_t* array, int len) { 3008 for (int i = 0; i < len; i++) { 3009 size_t val = array[i]; 3010 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 3011 size_t tmp = array[key]; 3012 array[key] = array[key - 1]; 3013 array[key - 1] = tmp; 3014 } 3015 } 3016} 3017 3018bool os::Solaris::mpss_sanity_check(bool warn, size_t * page_size) { 3019 getpagesizes_func_type getpagesizes_func = 3020 CAST_TO_FN_PTR(getpagesizes_func_type, dlsym(RTLD_DEFAULT, "getpagesizes")); 3021 if (getpagesizes_func == NULL) { 3022 if (warn) { 3023 warning("MPSS is not supported by the operating system."); 3024 } 3025 return false; 3026 } 3027 3028 const unsigned int usable_count = VM_Version::page_size_count(); 3029 if (usable_count == 1) { 3030 return false; 3031 } 3032 3033 // Fill the array of page sizes. 3034 int n = getpagesizes_func(_page_sizes, page_sizes_max); 3035 assert(n > 0, "Solaris bug?"); 3036 if (n == page_sizes_max) { 3037 // Add a sentinel value (necessary only if the array was completely filled 3038 // since it is static (zeroed at initialization)). 3039 _page_sizes[--n] = 0; 3040 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 3041 } 3042 assert(_page_sizes[n] == 0, "missing sentinel"); 3043 3044 if (n == 1) return false; // Only one page size available. 3045 3046 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 3047 // select up to usable_count elements. First sort the array, find the first 3048 // acceptable value, then copy the usable sizes to the top of the array and 3049 // trim the rest. Make sure to include the default page size :-). 3050 // 3051 // A better policy could get rid of the 4M limit by taking the sizes of the 3052 // important VM memory regions (java heap and possibly the code cache) into 3053 // account. 3054 insertion_sort_descending(_page_sizes, n); 3055 const size_t size_limit = 3056 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 3057 int beg; 3058 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ; 3059 const int end = MIN2((int)usable_count, n) - 1; 3060 for (int cur = 0; cur < end; ++cur, ++beg) { 3061 _page_sizes[cur] = _page_sizes[beg]; 3062 } 3063 _page_sizes[end] = vm_page_size(); 3064 _page_sizes[end + 1] = 0; 3065 3066 if (_page_sizes[end] > _page_sizes[end - 1]) { 3067 // Default page size is not the smallest; sort again. 3068 insertion_sort_descending(_page_sizes, end + 1); 3069 } 3070 *page_size = _page_sizes[0]; 3071 3072 return true; 3073} 3074 3075bool os::large_page_init() { 3076 if (!UseLargePages) { 3077 UseISM = false; 3078 UseMPSS = false; 3079 return false; 3080 } 3081 3082 // print a warning if any large page related flag is specified on command line 3083 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 3084 !FLAG_IS_DEFAULT(UseISM) || 3085 !FLAG_IS_DEFAULT(UseMPSS) || 3086 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 3087 UseISM = UseISM && 3088 Solaris::ism_sanity_check(warn_on_failure, &_large_page_size); 3089 if (UseISM) { 3090 // ISM disables MPSS to be compatible with old JDK behavior 3091 UseMPSS = false; 3092 } 3093 3094 UseMPSS = UseMPSS && 3095 Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 3096 3097 UseLargePages = UseISM || UseMPSS; 3098 return UseLargePages; 3099} 3100 3101bool os::Solaris::set_mpss_range(caddr_t start, size_t bytes, size_t align) { 3102 // Signal to OS that we want large pages for addresses 3103 // from addr, addr + bytes 3104 struct memcntl_mha mpss_struct; 3105 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 3106 mpss_struct.mha_pagesize = align; 3107 mpss_struct.mha_flags = 0; 3108 if (memcntl(start, bytes, MC_HAT_ADVISE, 3109 (caddr_t) &mpss_struct, 0, 0) < 0) { 3110 debug_only(warning("Attempt to use MPSS failed.")); 3111 return false; 3112 } 3113 return true; 3114} 3115 3116char* os::reserve_memory_special(size_t bytes) { 3117 assert(UseLargePages && UseISM, "only for ISM large pages"); 3118 3119 size_t size = bytes; 3120 char* retAddr = NULL; 3121 int shmid; 3122 key_t ismKey; 3123 3124 bool warn_on_failure = UseISM && 3125 (!FLAG_IS_DEFAULT(UseLargePages) || 3126 !FLAG_IS_DEFAULT(UseISM) || 3127 !FLAG_IS_DEFAULT(LargePageSizeInBytes) 3128 ); 3129 char msg[128]; 3130 3131 ismKey = IPC_PRIVATE; 3132 3133 // Create a large shared memory region to attach to based on size. 3134 // Currently, size is the total size of the heap 3135 shmid = shmget(ismKey, size, SHM_R | SHM_W | IPC_CREAT); 3136 if (shmid == -1){ 3137 if (warn_on_failure) { 3138 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); 3139 warning(msg); 3140 } 3141 return NULL; 3142 } 3143 3144 // Attach to the region 3145 retAddr = (char *) shmat(shmid, 0, SHM_SHARE_MMU | SHM_R | SHM_W); 3146 int err = errno; 3147 3148 // Remove shmid. If shmat() is successful, the actual shared memory segment 3149 // will be deleted when it's detached by shmdt() or when the process 3150 // terminates. If shmat() is not successful this will remove the shared 3151 // segment immediately. 3152 shmctl(shmid, IPC_RMID, NULL); 3153 3154 if (retAddr == (char *) -1) { 3155 if (warn_on_failure) { 3156 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); 3157 warning(msg); 3158 } 3159 return NULL; 3160 } 3161 3162 return retAddr; 3163} 3164 3165bool os::release_memory_special(char* base, size_t bytes) { 3166 // detaching the SHM segment will also delete it, see reserve_memory_special() 3167 int rslt = shmdt(base); 3168 return rslt == 0; 3169} 3170 3171size_t os::large_page_size() { 3172 return _large_page_size; 3173} 3174 3175// MPSS allows application to commit large page memory on demand; with ISM 3176// the entire memory region must be allocated as shared memory. 3177bool os::can_commit_large_page_memory() { 3178 return UseISM ? false : true; 3179} 3180 3181static int os_sleep(jlong millis, bool interruptible) { 3182 const jlong limit = INT_MAX; 3183 jlong prevtime; 3184 int res; 3185 3186 while (millis > limit) { 3187 if ((res = os_sleep(limit, interruptible)) != OS_OK) 3188 return res; 3189 millis -= limit; 3190 } 3191 3192 // Restart interrupted polls with new parameters until the proper delay 3193 // has been completed. 3194 3195 prevtime = getTimeMillis(); 3196 3197 while (millis > 0) { 3198 jlong newtime; 3199 3200 if (!interruptible) { 3201 // Following assert fails for os::yield_all: 3202 // assert(!thread->is_Java_thread(), "must not be java thread"); 3203 res = poll(NULL, 0, millis); 3204 } else { 3205 JavaThread *jt = JavaThread::current(); 3206 3207 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt, 3208 os::Solaris::clear_interrupted); 3209 } 3210 3211 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for 3212 // thread.Interrupt. 3213 3214 if((res == OS_ERR) && (errno == EINTR)) { 3215 newtime = getTimeMillis(); 3216 assert(newtime >= prevtime, "time moving backwards"); 3217 /* Doing prevtime and newtime in microseconds doesn't help precision, 3218 and trying to round up to avoid lost milliseconds can result in a 3219 too-short delay. */ 3220 millis -= newtime - prevtime; 3221 if(millis <= 0) 3222 return OS_OK; 3223 prevtime = newtime; 3224 } else 3225 return res; 3226 } 3227 3228 return OS_OK; 3229} 3230 3231// Read calls from inside the vm need to perform state transitions 3232size_t os::read(int fd, void *buf, unsigned int nBytes) { 3233 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted); 3234} 3235 3236int os::sleep(Thread* thread, jlong millis, bool interruptible) { 3237 assert(thread == Thread::current(), "thread consistency check"); 3238 3239 // TODO-FIXME: this should be removed. 3240 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock 3241 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate 3242 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving 3243 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel 3244 // is fooled into believing that the system is making progress. In the code below we block the 3245 // the watcher thread while safepoint is in progress so that it would not appear as though the 3246 // system is making progress. 3247 if (!Solaris::T2_libthread() && 3248 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) { 3249 // We now try to acquire the threads lock. Since this lock is held by the VM thread during 3250 // the entire safepoint, the watcher thread will line up here during the safepoint. 3251 Threads_lock->lock_without_safepoint_check(); 3252 Threads_lock->unlock(); 3253 } 3254 3255 if (thread->is_Java_thread()) { 3256 // This is a JavaThread so we honor the _thread_blocked protocol 3257 // even for sleeps of 0 milliseconds. This was originally done 3258 // as a workaround for bug 4338139. However, now we also do it 3259 // to honor the suspend-equivalent protocol. 3260 3261 JavaThread *jt = (JavaThread *) thread; 3262 ThreadBlockInVM tbivm(jt); 3263 3264 jt->set_suspend_equivalent(); 3265 // cleared by handle_special_suspend_equivalent_condition() or 3266 // java_suspend_self() via check_and_wait_while_suspended() 3267 3268 int ret_code; 3269 if (millis <= 0) { 3270 thr_yield(); 3271 ret_code = 0; 3272 } else { 3273 // The original sleep() implementation did not create an 3274 // OSThreadWaitState helper for sleeps of 0 milliseconds. 3275 // I'm preserving that decision for now. 3276 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 3277 3278 ret_code = os_sleep(millis, interruptible); 3279 } 3280 3281 // were we externally suspended while we were waiting? 3282 jt->check_and_wait_while_suspended(); 3283 3284 return ret_code; 3285 } 3286 3287 // non-JavaThread from this point on: 3288 3289 if (millis <= 0) { 3290 thr_yield(); 3291 return 0; 3292 } 3293 3294 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 3295 3296 return os_sleep(millis, interruptible); 3297} 3298 3299int os::naked_sleep() { 3300 // %% make the sleep time an integer flag. for now use 1 millisec. 3301 return os_sleep(1, false); 3302} 3303 3304// Sleep forever; naked call to OS-specific sleep; use with CAUTION 3305void os::infinite_sleep() { 3306 while (true) { // sleep forever ... 3307 ::sleep(100); // ... 100 seconds at a time 3308 } 3309} 3310 3311// Used to convert frequent JVM_Yield() to nops 3312bool os::dont_yield() { 3313 if (DontYieldALot) { 3314 static hrtime_t last_time = 0; 3315 hrtime_t diff = getTimeNanos() - last_time; 3316 3317 if (diff < DontYieldALotInterval * 1000000) 3318 return true; 3319 3320 last_time += diff; 3321 3322 return false; 3323 } 3324 else { 3325 return false; 3326 } 3327} 3328 3329// Caveat: Solaris os::yield() causes a thread-state transition whereas 3330// the linux and win32 implementations do not. This should be checked. 3331 3332void os::yield() { 3333 // Yields to all threads with same or greater priority 3334 os::sleep(Thread::current(), 0, false); 3335} 3336 3337// Note that yield semantics are defined by the scheduling class to which 3338// the thread currently belongs. Typically, yield will _not yield to 3339// other equal or higher priority threads that reside on the dispatch queues 3340// of other CPUs. 3341 3342os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; } 3343 3344 3345// On Solaris we found that yield_all doesn't always yield to all other threads. 3346// There have been cases where there is a thread ready to execute but it doesn't 3347// get an lwp as the VM thread continues to spin with sleeps of 1 millisecond. 3348// The 1 millisecond wait doesn't seem long enough for the kernel to issue a 3349// SIGWAITING signal which will cause a new lwp to be created. So we count the 3350// number of times yield_all is called in the one loop and increase the sleep 3351// time after 8 attempts. If this fails too we increase the concurrency level 3352// so that the starving thread would get an lwp 3353 3354void os::yield_all(int attempts) { 3355 // Yields to all threads, including threads with lower priorities 3356 if (attempts == 0) { 3357 os::sleep(Thread::current(), 1, false); 3358 } else { 3359 int iterations = attempts % 30; 3360 if (iterations == 0 && !os::Solaris::T2_libthread()) { 3361 // thr_setconcurrency and _getconcurrency make sense only under T1. 3362 int noofLWPS = thr_getconcurrency(); 3363 if (noofLWPS < (Threads::number_of_threads() + 2)) { 3364 thr_setconcurrency(thr_getconcurrency() + 1); 3365 } 3366 } else if (iterations < 25) { 3367 os::sleep(Thread::current(), 1, false); 3368 } else { 3369 os::sleep(Thread::current(), 10, false); 3370 } 3371 } 3372} 3373 3374// Called from the tight loops to possibly influence time-sharing heuristics 3375void os::loop_breaker(int attempts) { 3376 os::yield_all(attempts); 3377} 3378 3379 3380// Interface for setting lwp priorities. If we are using T2 libthread, 3381// which forces the use of BoundThreads or we manually set UseBoundThreads, 3382// all of our threads will be assigned to real lwp's. Using the thr_setprio 3383// function is meaningless in this mode so we must adjust the real lwp's priority 3384// The routines below implement the getting and setting of lwp priorities. 3385// 3386// Note: There are three priority scales used on Solaris. Java priotities 3387// which range from 1 to 10, libthread "thr_setprio" scale which range 3388// from 0 to 127, and the current scheduling class of the process we 3389// are running in. This is typically from -60 to +60. 3390// The setting of the lwp priorities in done after a call to thr_setprio 3391// so Java priorities are mapped to libthread priorities and we map from 3392// the latter to lwp priorities. We don't keep priorities stored in 3393// Java priorities since some of our worker threads want to set priorities 3394// higher than all Java threads. 3395// 3396// For related information: 3397// (1) man -s 2 priocntl 3398// (2) man -s 4 priocntl 3399// (3) man dispadmin 3400// = librt.so 3401// = libthread/common/rtsched.c - thrp_setlwpprio(). 3402// = ps -cL <pid> ... to validate priority. 3403// = sched_get_priority_min and _max 3404// pthread_create 3405// sched_setparam 3406// pthread_setschedparam 3407// 3408// Assumptions: 3409// + We assume that all threads in the process belong to the same 3410// scheduling class. IE. an homogenous process. 3411// + Must be root or in IA group to change change "interactive" attribute. 3412// Priocntl() will fail silently. The only indication of failure is when 3413// we read-back the value and notice that it hasn't changed. 3414// + Interactive threads enter the runq at the head, non-interactive at the tail. 3415// + For RT, change timeslice as well. Invariant: 3416// constant "priority integral" 3417// Konst == TimeSlice * (60-Priority) 3418// Given a priority, compute appropriate timeslice. 3419// + Higher numerical values have higher priority. 3420 3421// sched class attributes 3422typedef struct { 3423 int schedPolicy; // classID 3424 int maxPrio; 3425 int minPrio; 3426} SchedInfo; 3427 3428 3429static SchedInfo tsLimits, iaLimits, rtLimits; 3430 3431#ifdef ASSERT 3432static int ReadBackValidate = 1; 3433#endif 3434static int myClass = 0; 3435static int myMin = 0; 3436static int myMax = 0; 3437static int myCur = 0; 3438static bool priocntl_enable = false; 3439 3440 3441// Call the version of priocntl suitable for all supported versions 3442// of Solaris. We need to call through this wrapper so that we can 3443// build on Solaris 9 and run on Solaris 8, 9 and 10. 3444// 3445// This code should be removed if we ever stop supporting Solaris 8 3446// and earlier releases. 3447 3448static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg); 3449typedef long (*priocntl_type)(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg); 3450static priocntl_type priocntl_ptr = priocntl_stub; 3451 3452// Stub to set the value of the real pointer, and then call the real 3453// function. 3454 3455static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg) { 3456 // Try Solaris 8- name only. 3457 priocntl_type tmp = (priocntl_type)dlsym(RTLD_DEFAULT, "__priocntl"); 3458 guarantee(tmp != NULL, "priocntl function not found."); 3459 priocntl_ptr = tmp; 3460 return (*priocntl_ptr)(PC_VERSION, idtype, id, cmd, arg); 3461} 3462 3463 3464// lwp_priocntl_init 3465// 3466// Try to determine the priority scale for our process. 3467// 3468// Return errno or 0 if OK. 3469// 3470static 3471int lwp_priocntl_init () 3472{ 3473 int rslt; 3474 pcinfo_t ClassInfo; 3475 pcparms_t ParmInfo; 3476 int i; 3477 3478 if (!UseThreadPriorities) return 0; 3479 3480 // We are using Bound threads, we need to determine our priority ranges 3481 if (os::Solaris::T2_libthread() || UseBoundThreads) { 3482 // If ThreadPriorityPolicy is 1, switch tables 3483 if (ThreadPriorityPolicy == 1) { 3484 for (i = 0 ; i < MaxPriority+1; i++) 3485 os::java_to_os_priority[i] = prio_policy1[i]; 3486 } 3487 } 3488 // Not using Bound Threads, set to ThreadPolicy 1 3489 else { 3490 for ( i = 0 ; i < MaxPriority+1; i++ ) { 3491 os::java_to_os_priority[i] = prio_policy1[i]; 3492 } 3493 return 0; 3494 } 3495 3496 3497 // Get IDs for a set of well-known scheduling classes. 3498 // TODO-FIXME: GETCLINFO returns the current # of classes in the 3499 // the system. We should have a loop that iterates over the 3500 // classID values, which are known to be "small" integers. 3501 3502 strcpy(ClassInfo.pc_clname, "TS"); 3503 ClassInfo.pc_cid = -1; 3504 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3505 if (rslt < 0) return errno; 3506 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 3507 tsLimits.schedPolicy = ClassInfo.pc_cid; 3508 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 3509 tsLimits.minPrio = -tsLimits.maxPrio; 3510 3511 strcpy(ClassInfo.pc_clname, "IA"); 3512 ClassInfo.pc_cid = -1; 3513 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3514 if (rslt < 0) return errno; 3515 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 3516 iaLimits.schedPolicy = ClassInfo.pc_cid; 3517 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 3518 iaLimits.minPrio = -iaLimits.maxPrio; 3519 3520 strcpy(ClassInfo.pc_clname, "RT"); 3521 ClassInfo.pc_cid = -1; 3522 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3523 if (rslt < 0) return errno; 3524 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 3525 rtLimits.schedPolicy = ClassInfo.pc_cid; 3526 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 3527 rtLimits.minPrio = 0; 3528 3529 3530 // Query our "current" scheduling class. 3531 // This will normally be IA,TS or, rarely, RT. 3532 memset (&ParmInfo, 0, sizeof(ParmInfo)); 3533 ParmInfo.pc_cid = PC_CLNULL; 3534 rslt = (*priocntl_ptr) (PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo ); 3535 if ( rslt < 0 ) return errno; 3536 myClass = ParmInfo.pc_cid; 3537 3538 // We now know our scheduling classId, get specific information 3539 // the class. 3540 ClassInfo.pc_cid = myClass; 3541 ClassInfo.pc_clname[0] = 0; 3542 rslt = (*priocntl_ptr) (PC_VERSION, (idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo ); 3543 if ( rslt < 0 ) return errno; 3544 3545 if (ThreadPriorityVerbose) 3546 tty->print_cr ("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 3547 3548 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3549 ParmInfo.pc_cid = PC_CLNULL; 3550 rslt = (*priocntl_ptr)(PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3551 if (rslt < 0) return errno; 3552 3553 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3554 myMin = rtLimits.minPrio; 3555 myMax = rtLimits.maxPrio; 3556 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3557 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3558 myMin = iaLimits.minPrio; 3559 myMax = iaLimits.maxPrio; 3560 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 3561 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3562 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3563 myMin = tsLimits.minPrio; 3564 myMax = tsLimits.maxPrio; 3565 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 3566 } else { 3567 // No clue - punt 3568 if (ThreadPriorityVerbose) 3569 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname); 3570 return EINVAL; // no clue, punt 3571 } 3572 3573 if (ThreadPriorityVerbose) 3574 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax); 3575 3576 priocntl_enable = true; // Enable changing priorities 3577 return 0; 3578} 3579 3580#define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 3581#define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 3582#define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 3583 3584 3585// scale_to_lwp_priority 3586// 3587// Convert from the libthread "thr_setprio" scale to our current 3588// lwp scheduling class scale. 3589// 3590static 3591int scale_to_lwp_priority (int rMin, int rMax, int x) 3592{ 3593 int v; 3594 3595 if (x == 127) return rMax; // avoid round-down 3596 v = (((x*(rMax-rMin)))/128)+rMin; 3597 return v; 3598} 3599 3600 3601// set_lwp_priority 3602// 3603// Set the priority of the lwp. This call should only be made 3604// when using bound threads (T2 threads are bound by default). 3605// 3606int set_lwp_priority (int ThreadID, int lwpid, int newPrio ) 3607{ 3608 int rslt; 3609 int Actual, Expected, prv; 3610 pcparms_t ParmInfo; // for GET-SET 3611#ifdef ASSERT 3612 pcparms_t ReadBack; // for readback 3613#endif 3614 3615 // Set priority via PC_GETPARMS, update, PC_SETPARMS 3616 // Query current values. 3617 // TODO: accelerate this by eliminating the PC_GETPARMS call. 3618 // Cache "pcparms_t" in global ParmCache. 3619 // TODO: elide set-to-same-value 3620 3621 // If something went wrong on init, don't change priorities. 3622 if ( !priocntl_enable ) { 3623 if (ThreadPriorityVerbose) 3624 tty->print_cr("Trying to set priority but init failed, ignoring"); 3625 return EINVAL; 3626 } 3627 3628 3629 // If lwp hasn't started yet, just return 3630 // the _start routine will call us again. 3631 if ( lwpid <= 0 ) { 3632 if (ThreadPriorityVerbose) { 3633 tty->print_cr ("deferring the set_lwp_priority of thread " INTPTR_FORMAT " to %d, lwpid not set", 3634 ThreadID, newPrio); 3635 } 3636 return 0; 3637 } 3638 3639 if (ThreadPriorityVerbose) { 3640 tty->print_cr ("set_lwp_priority(" INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 3641 ThreadID, lwpid, newPrio); 3642 } 3643 3644 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3645 ParmInfo.pc_cid = PC_CLNULL; 3646 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 3647 if (rslt < 0) return errno; 3648 3649 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3650 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 3651 rtInfo->rt_pri = scale_to_lwp_priority (rtLimits.minPrio, rtLimits.maxPrio, newPrio); 3652 rtInfo->rt_tqsecs = RT_NOCHANGE; 3653 rtInfo->rt_tqnsecs = RT_NOCHANGE; 3654 if (ThreadPriorityVerbose) { 3655 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 3656 } 3657 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3658 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3659 int maxClamped = MIN2(iaLimits.maxPrio, (int)iaInfo->ia_uprilim); 3660 iaInfo->ia_upri = scale_to_lwp_priority(iaLimits.minPrio, maxClamped, newPrio); 3661 iaInfo->ia_uprilim = IA_NOCHANGE; 3662 iaInfo->ia_nice = IA_NOCHANGE; 3663 iaInfo->ia_mode = IA_NOCHANGE; 3664 if (ThreadPriorityVerbose) { 3665 tty->print_cr ("IA: [%d...%d] %d->%d\n", 3666 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 3667 } 3668 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3669 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3670 int maxClamped = MIN2(tsLimits.maxPrio, (int)tsInfo->ts_uprilim); 3671 prv = tsInfo->ts_upri; 3672 tsInfo->ts_upri = scale_to_lwp_priority(tsLimits.minPrio, maxClamped, newPrio); 3673 tsInfo->ts_uprilim = IA_NOCHANGE; 3674 if (ThreadPriorityVerbose) { 3675 tty->print_cr ("TS: %d [%d...%d] %d->%d\n", 3676 prv, tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 3677 } 3678 if (prv == tsInfo->ts_upri) return 0; 3679 } else { 3680 if ( ThreadPriorityVerbose ) { 3681 tty->print_cr ("Unknown scheduling class\n"); 3682 } 3683 return EINVAL; // no clue, punt 3684 } 3685 3686 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 3687 if (ThreadPriorityVerbose && rslt) { 3688 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 3689 } 3690 if (rslt < 0) return errno; 3691 3692#ifdef ASSERT 3693 // Sanity check: read back what we just attempted to set. 3694 // In theory it could have changed in the interim ... 3695 // 3696 // The priocntl system call is tricky. 3697 // Sometimes it'll validate the priority value argument and 3698 // return EINVAL if unhappy. At other times it fails silently. 3699 // Readbacks are prudent. 3700 3701 if (!ReadBackValidate) return 0; 3702 3703 memset(&ReadBack, 0, sizeof(pcparms_t)); 3704 ReadBack.pc_cid = PC_CLNULL; 3705 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 3706 assert(rslt >= 0, "priocntl failed"); 3707 Actual = Expected = 0xBAD; 3708 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3709 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3710 Actual = RTPRI(ReadBack)->rt_pri; 3711 Expected = RTPRI(ParmInfo)->rt_pri; 3712 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3713 Actual = IAPRI(ReadBack)->ia_upri; 3714 Expected = IAPRI(ParmInfo)->ia_upri; 3715 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3716 Actual = TSPRI(ReadBack)->ts_upri; 3717 Expected = TSPRI(ParmInfo)->ts_upri; 3718 } else { 3719 if ( ThreadPriorityVerbose ) { 3720 tty->print_cr("set_lwp_priority: unexpected class in readback: %d\n", ParmInfo.pc_cid); 3721 } 3722 } 3723 3724 if (Actual != Expected) { 3725 if ( ThreadPriorityVerbose ) { 3726 tty->print_cr ("set_lwp_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 3727 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 3728 } 3729 } 3730#endif 3731 3732 return 0; 3733} 3734 3735 3736 3737// Solaris only gives access to 128 real priorities at a time, 3738// so we expand Java's ten to fill this range. This would be better 3739// if we dynamically adjusted relative priorities. 3740// 3741// The ThreadPriorityPolicy option allows us to select 2 different 3742// priority scales. 3743// 3744// ThreadPriorityPolicy=0 3745// Since the Solaris' default priority is MaximumPriority, we do not 3746// set a priority lower than Max unless a priority lower than 3747// NormPriority is requested. 3748// 3749// ThreadPriorityPolicy=1 3750// This mode causes the priority table to get filled with 3751// linear values. NormPriority get's mapped to 50% of the 3752// Maximum priority an so on. This will cause VM threads 3753// to get unfair treatment against other Solaris processes 3754// which do not explicitly alter their thread priorities. 3755// 3756 3757 3758int os::java_to_os_priority[MaxPriority + 1] = { 3759 -99999, // 0 Entry should never be used 3760 3761 0, // 1 MinPriority 3762 32, // 2 3763 64, // 3 3764 3765 96, // 4 3766 127, // 5 NormPriority 3767 127, // 6 3768 3769 127, // 7 3770 127, // 8 3771 127, // 9 NearMaxPriority 3772 3773 127 // 10 MaxPriority 3774}; 3775 3776 3777OSReturn os::set_native_priority(Thread* thread, int newpri) { 3778 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 3779 if ( !UseThreadPriorities ) return OS_OK; 3780 int status = thr_setprio(thread->osthread()->thread_id(), newpri); 3781 if ( os::Solaris::T2_libthread() || (UseBoundThreads && thread->osthread()->is_vm_created()) ) 3782 status |= (set_lwp_priority (thread->osthread()->thread_id(), 3783 thread->osthread()->lwp_id(), newpri )); 3784 return (status == 0) ? OS_OK : OS_ERR; 3785} 3786 3787 3788OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 3789 int p; 3790 if ( !UseThreadPriorities ) { 3791 *priority_ptr = NormalPriority; 3792 return OS_OK; 3793 } 3794 int status = thr_getprio(thread->osthread()->thread_id(), &p); 3795 if (status != 0) { 3796 return OS_ERR; 3797 } 3798 *priority_ptr = p; 3799 return OS_OK; 3800} 3801 3802 3803// Hint to the underlying OS that a task switch would not be good. 3804// Void return because it's a hint and can fail. 3805void os::hint_no_preempt() { 3806 schedctl_start(schedctl_init()); 3807} 3808 3809void os::interrupt(Thread* thread) { 3810 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer"); 3811 3812 OSThread* osthread = thread->osthread(); 3813 3814 int isInterrupted = osthread->interrupted(); 3815 if (!isInterrupted) { 3816 osthread->set_interrupted(true); 3817 OrderAccess::fence(); 3818 // os::sleep() is implemented with either poll (NULL,0,timeout) or 3819 // by parking on _SleepEvent. If the former, thr_kill will unwedge 3820 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper. 3821 ParkEvent * const slp = thread->_SleepEvent ; 3822 if (slp != NULL) slp->unpark() ; 3823 } 3824 3825 // For JSR166: unpark after setting status but before thr_kill -dl 3826 if (thread->is_Java_thread()) { 3827 ((JavaThread*)thread)->parker()->unpark(); 3828 } 3829 3830 // Handle interruptible wait() ... 3831 ParkEvent * const ev = thread->_ParkEvent ; 3832 if (ev != NULL) ev->unpark() ; 3833 3834 // When events are used everywhere for os::sleep, then this thr_kill 3835 // will only be needed if UseVMInterruptibleIO is true. 3836 3837 if (!isInterrupted) { 3838 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt()); 3839 assert_status(status == 0, status, "thr_kill"); 3840 3841 // Bump thread interruption counter 3842 RuntimeService::record_thread_interrupt_signaled_count(); 3843 } 3844} 3845 3846 3847bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3848 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer"); 3849 3850 OSThread* osthread = thread->osthread(); 3851 3852 bool res = osthread->interrupted(); 3853 3854 // NOTE that since there is no "lock" around these two operations, 3855 // there is the possibility that the interrupted flag will be 3856 // "false" but that the interrupt event will be set. This is 3857 // intentional. The effect of this is that Object.wait() will appear 3858 // to have a spurious wakeup, which is not harmful, and the 3859 // possibility is so rare that it is not worth the added complexity 3860 // to add yet another lock. It has also been recommended not to put 3861 // the interrupted flag into the os::Solaris::Event structure, 3862 // because it hides the issue. 3863 if (res && clear_interrupted) { 3864 osthread->set_interrupted(false); 3865 } 3866 return res; 3867} 3868 3869 3870void os::print_statistics() { 3871} 3872 3873int os::message_box(const char* title, const char* message) { 3874 int i; 3875 fdStream err(defaultStream::error_fd()); 3876 for (i = 0; i < 78; i++) err.print_raw("="); 3877 err.cr(); 3878 err.print_raw_cr(title); 3879 for (i = 0; i < 78; i++) err.print_raw("-"); 3880 err.cr(); 3881 err.print_raw_cr(message); 3882 for (i = 0; i < 78; i++) err.print_raw("="); 3883 err.cr(); 3884 3885 char buf[16]; 3886 // Prevent process from exiting upon "read error" without consuming all CPU 3887 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3888 3889 return buf[0] == 'y' || buf[0] == 'Y'; 3890} 3891 3892// A lightweight implementation that does not suspend the target thread and 3893// thus returns only a hint. Used for profiling only! 3894ExtendedPC os::get_thread_pc(Thread* thread) { 3895 // Make sure that it is called by the watcher and the Threads lock is owned. 3896 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock"); 3897 // For now, is only used to profile the VM Thread 3898 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3899 ExtendedPC epc; 3900 3901 GetThreadPC_Callback cb(ProfileVM_lock); 3902 OSThread *osthread = thread->osthread(); 3903 const int time_to_wait = 400; // 400ms wait for initial response 3904 int status = cb.interrupt(thread, time_to_wait); 3905 3906 if (cb.is_done() ) { 3907 epc = cb.addr(); 3908 } else { 3909 DEBUG_ONLY(tty->print_cr("Failed to get pc for thread: %d got %d status", 3910 osthread->thread_id(), status);); 3911 // epc is already NULL 3912 } 3913 return epc; 3914} 3915 3916 3917// This does not do anything on Solaris. This is basically a hook for being 3918// able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 3919void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) { 3920 f(value, method, args, thread); 3921} 3922 3923// This routine may be used by user applications as a "hook" to catch signals. 3924// The user-defined signal handler must pass unrecognized signals to this 3925// routine, and if it returns true (non-zero), then the signal handler must 3926// return immediately. If the flag "abort_if_unrecognized" is true, then this 3927// routine will never retun false (zero), but instead will execute a VM panic 3928// routine kill the process. 3929// 3930// If this routine returns false, it is OK to call it again. This allows 3931// the user-defined signal handler to perform checks either before or after 3932// the VM performs its own checks. Naturally, the user code would be making 3933// a serious error if it tried to handle an exception (such as a null check 3934// or breakpoint) that the VM was generating for its own correct operation. 3935// 3936// This routine may recognize any of the following kinds of signals: 3937// SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 3938// os::Solaris::SIGasync 3939// It should be consulted by handlers for any of those signals. 3940// It explicitly does not recognize os::Solaris::SIGinterrupt 3941// 3942// The caller of this routine must pass in the three arguments supplied 3943// to the function referred to in the "sa_sigaction" (not the "sa_handler") 3944// field of the structure passed to sigaction(). This routine assumes that 3945// the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3946// 3947// Note that the VM will print warnings if it detects conflicting signal 3948// handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3949// 3950extern "C" int JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized); 3951 3952 3953void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 3954 JVM_handle_solaris_signal(sig, info, ucVoid, true); 3955} 3956 3957/* Do not delete - if guarantee is ever removed, a signal handler (even empty) 3958 is needed to provoke threads blocked on IO to return an EINTR 3959 Note: this explicitly does NOT call JVM_handle_solaris_signal and 3960 does NOT participate in signal chaining due to requirement for 3961 NOT setting SA_RESTART to make EINTR work. */ 3962extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) { 3963 if (UseSignalChaining) { 3964 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig); 3965 if (actp && actp->sa_handler) { 3966 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs"); 3967 } 3968 } 3969} 3970 3971// This boolean allows users to forward their own non-matching signals 3972// to JVM_handle_solaris_signal, harmlessly. 3973bool os::Solaris::signal_handlers_are_installed = false; 3974 3975// For signal-chaining 3976bool os::Solaris::libjsig_is_loaded = false; 3977typedef struct sigaction *(*get_signal_t)(int); 3978get_signal_t os::Solaris::get_signal_action = NULL; 3979 3980struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 3981 struct sigaction *actp = NULL; 3982 3983 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) { 3984 // Retrieve the old signal handler from libjsig 3985 actp = (*get_signal_action)(sig); 3986 } 3987 if (actp == NULL) { 3988 // Retrieve the preinstalled signal handler from jvm 3989 actp = get_preinstalled_handler(sig); 3990 } 3991 3992 return actp; 3993} 3994 3995static bool call_chained_handler(struct sigaction *actp, int sig, 3996 siginfo_t *siginfo, void *context) { 3997 // Call the old signal handler 3998 if (actp->sa_handler == SIG_DFL) { 3999 // It's more reasonable to let jvm treat it as an unexpected exception 4000 // instead of taking the default action. 4001 return false; 4002 } else if (actp->sa_handler != SIG_IGN) { 4003 if ((actp->sa_flags & SA_NODEFER) == 0) { 4004 // automaticlly block the signal 4005 sigaddset(&(actp->sa_mask), sig); 4006 } 4007 4008 sa_handler_t hand; 4009 sa_sigaction_t sa; 4010 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 4011 // retrieve the chained handler 4012 if (siginfo_flag_set) { 4013 sa = actp->sa_sigaction; 4014 } else { 4015 hand = actp->sa_handler; 4016 } 4017 4018 if ((actp->sa_flags & SA_RESETHAND) != 0) { 4019 actp->sa_handler = SIG_DFL; 4020 } 4021 4022 // try to honor the signal mask 4023 sigset_t oset; 4024 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset); 4025 4026 // call into the chained handler 4027 if (siginfo_flag_set) { 4028 (*sa)(sig, siginfo, context); 4029 } else { 4030 (*hand)(sig); 4031 } 4032 4033 // restore the signal mask 4034 thr_sigsetmask(SIG_SETMASK, &oset, 0); 4035 } 4036 // Tell jvm's signal handler the signal is taken care of. 4037 return true; 4038} 4039 4040bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 4041 bool chained = false; 4042 // signal-chaining 4043 if (UseSignalChaining) { 4044 struct sigaction *actp = get_chained_signal_action(sig); 4045 if (actp != NULL) { 4046 chained = call_chained_handler(actp, sig, siginfo, context); 4047 } 4048 } 4049 return chained; 4050} 4051 4052struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 4053 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized"); 4054 if (preinstalled_sigs[sig] != 0) { 4055 return &chainedsigactions[sig]; 4056 } 4057 return NULL; 4058} 4059 4060void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 4061 4062 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 4063 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized"); 4064 chainedsigactions[sig] = oldAct; 4065 preinstalled_sigs[sig] = 1; 4066} 4067 4068void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) { 4069 // Check for overwrite. 4070 struct sigaction oldAct; 4071 sigaction(sig, (struct sigaction*)NULL, &oldAct); 4072 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4073 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4074 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 4075 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 4076 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 4077 if (AllowUserSignalHandlers || !set_installed) { 4078 // Do not overwrite; user takes responsibility to forward to us. 4079 return; 4080 } else if (UseSignalChaining) { 4081 if (oktochain) { 4082 // save the old handler in jvm 4083 save_preinstalled_handler(sig, oldAct); 4084 } else { 4085 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs."); 4086 } 4087 // libjsig also interposes the sigaction() call below and saves the 4088 // old sigaction on it own. 4089 } else { 4090 fatal2("Encountered unexpected pre-existing sigaction handler %#lx for signal %d.", (long)oldhand, sig); 4091 } 4092 } 4093 4094 struct sigaction sigAct; 4095 sigfillset(&(sigAct.sa_mask)); 4096 sigAct.sa_handler = SIG_DFL; 4097 4098 sigAct.sa_sigaction = signalHandler; 4099 // Handle SIGSEGV on alternate signal stack if 4100 // not using stack banging 4101 if (!UseStackBanging && sig == SIGSEGV) { 4102 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 4103 // Interruptible i/o requires SA_RESTART cleared so EINTR 4104 // is returned instead of restarting system calls 4105 } else if (sig == os::Solaris::SIGinterrupt()) { 4106 sigemptyset(&sigAct.sa_mask); 4107 sigAct.sa_handler = NULL; 4108 sigAct.sa_flags = SA_SIGINFO; 4109 sigAct.sa_sigaction = sigINTRHandler; 4110 } else { 4111 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 4112 } 4113 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 4114 4115 sigaction(sig, &sigAct, &oldAct); 4116 4117 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4118 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4119 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 4120} 4121 4122 4123#define DO_SIGNAL_CHECK(sig) \ 4124 if (!sigismember(&check_signal_done, sig)) \ 4125 os::Solaris::check_signal_handler(sig) 4126 4127// This method is a periodic task to check for misbehaving JNI applications 4128// under CheckJNI, we can add any periodic checks here 4129 4130void os::run_periodic_checks() { 4131 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 4132 // thereby preventing a NULL checks. 4133 if(!check_addr0_done) check_addr0_done = check_addr0(tty); 4134 4135 if (check_signals == false) return; 4136 4137 // SEGV and BUS if overridden could potentially prevent 4138 // generation of hs*.log in the event of a crash, debugging 4139 // such a case can be very challenging, so we absolutely 4140 // check for the following for a good measure: 4141 DO_SIGNAL_CHECK(SIGSEGV); 4142 DO_SIGNAL_CHECK(SIGILL); 4143 DO_SIGNAL_CHECK(SIGFPE); 4144 DO_SIGNAL_CHECK(SIGBUS); 4145 DO_SIGNAL_CHECK(SIGPIPE); 4146 DO_SIGNAL_CHECK(SIGXFSZ); 4147 4148 // ReduceSignalUsage allows the user to override these handlers 4149 // see comments at the very top and jvm_solaris.h 4150 if (!ReduceSignalUsage) { 4151 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 4152 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 4153 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 4154 DO_SIGNAL_CHECK(BREAK_SIGNAL); 4155 } 4156 4157 // See comments above for using JVM1/JVM2 and UseAltSigs 4158 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt()); 4159 DO_SIGNAL_CHECK(os::Solaris::SIGasync()); 4160 4161} 4162 4163typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 4164 4165static os_sigaction_t os_sigaction = NULL; 4166 4167void os::Solaris::check_signal_handler(int sig) { 4168 char buf[O_BUFLEN]; 4169 address jvmHandler = NULL; 4170 4171 struct sigaction act; 4172 if (os_sigaction == NULL) { 4173 // only trust the default sigaction, in case it has been interposed 4174 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 4175 if (os_sigaction == NULL) return; 4176 } 4177 4178 os_sigaction(sig, (struct sigaction*)NULL, &act); 4179 4180 address thisHandler = (act.sa_flags & SA_SIGINFO) 4181 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 4182 : CAST_FROM_FN_PTR(address, act.sa_handler) ; 4183 4184 4185 switch(sig) { 4186 case SIGSEGV: 4187 case SIGBUS: 4188 case SIGFPE: 4189 case SIGPIPE: 4190 case SIGXFSZ: 4191 case SIGILL: 4192 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4193 break; 4194 4195 case SHUTDOWN1_SIGNAL: 4196 case SHUTDOWN2_SIGNAL: 4197 case SHUTDOWN3_SIGNAL: 4198 case BREAK_SIGNAL: 4199 jvmHandler = (address)user_handler(); 4200 break; 4201 4202 default: 4203 int intrsig = os::Solaris::SIGinterrupt(); 4204 int asynsig = os::Solaris::SIGasync(); 4205 4206 if (sig == intrsig) { 4207 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler); 4208 } else if (sig == asynsig) { 4209 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4210 } else { 4211 return; 4212 } 4213 break; 4214 } 4215 4216 4217 if (thisHandler != jvmHandler) { 4218 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 4219 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 4220 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 4221 // No need to check this sig any longer 4222 sigaddset(&check_signal_done, sig); 4223 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 4224 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 4225 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig)); 4226 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); 4227 // No need to check this sig any longer 4228 sigaddset(&check_signal_done, sig); 4229 } 4230 4231 // Print all the signal handler state 4232 if (sigismember(&check_signal_done, sig)) { 4233 print_signal_handlers(tty, buf, O_BUFLEN); 4234 } 4235 4236} 4237 4238void os::Solaris::install_signal_handlers() { 4239 bool libjsigdone = false; 4240 signal_handlers_are_installed = true; 4241 4242 // signal-chaining 4243 typedef void (*signal_setting_t)(); 4244 signal_setting_t begin_signal_setting = NULL; 4245 signal_setting_t end_signal_setting = NULL; 4246 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4247 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 4248 if (begin_signal_setting != NULL) { 4249 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4250 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 4251 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 4252 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 4253 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t, 4254 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version")); 4255 libjsig_is_loaded = true; 4256 if (os::Solaris::get_libjsig_version != NULL) { 4257 libjsigversion = (*os::Solaris::get_libjsig_version)(); 4258 } 4259 assert(UseSignalChaining, "should enable signal-chaining"); 4260 } 4261 if (libjsig_is_loaded) { 4262 // Tell libjsig jvm is setting signal handlers 4263 (*begin_signal_setting)(); 4264 } 4265 4266 set_signal_handler(SIGSEGV, true, true); 4267 set_signal_handler(SIGPIPE, true, true); 4268 set_signal_handler(SIGXFSZ, true, true); 4269 set_signal_handler(SIGBUS, true, true); 4270 set_signal_handler(SIGILL, true, true); 4271 set_signal_handler(SIGFPE, true, true); 4272 4273 4274 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) { 4275 4276 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so 4277 // can not register overridable signals which might be > 32 4278 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) { 4279 // Tell libjsig jvm has finished setting signal handlers 4280 (*end_signal_setting)(); 4281 libjsigdone = true; 4282 } 4283 } 4284 4285 // Never ok to chain our SIGinterrupt 4286 set_signal_handler(os::Solaris::SIGinterrupt(), true, false); 4287 set_signal_handler(os::Solaris::SIGasync(), true, true); 4288 4289 if (libjsig_is_loaded && !libjsigdone) { 4290 // Tell libjsig jvm finishes setting signal handlers 4291 (*end_signal_setting)(); 4292 } 4293 4294 // We don't activate signal checker if libjsig is in place, we trust ourselves 4295 // and if UserSignalHandler is installed all bets are off 4296 if (CheckJNICalls) { 4297 if (libjsig_is_loaded) { 4298 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 4299 check_signals = false; 4300 } 4301 if (AllowUserSignalHandlers) { 4302 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4303 check_signals = false; 4304 } 4305 } 4306} 4307 4308 4309void report_error(const char* file_name, int line_no, const char* title, const char* format, ...); 4310 4311const char * signames[] = { 4312 "SIG0", 4313 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP", 4314 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS", 4315 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM", 4316 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH", 4317 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT", 4318 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU", 4319 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW", 4320 "SIGCANCEL", "SIGLOST" 4321}; 4322 4323const char* os::exception_name(int exception_code, char* buf, size_t size) { 4324 if (0 < exception_code && exception_code <= SIGRTMAX) { 4325 // signal 4326 if (exception_code < sizeof(signames)/sizeof(const char*)) { 4327 jio_snprintf(buf, size, "%s", signames[exception_code]); 4328 } else { 4329 jio_snprintf(buf, size, "SIG%d", exception_code); 4330 } 4331 return buf; 4332 } else { 4333 return NULL; 4334 } 4335} 4336 4337// (Static) wrappers for the new libthread API 4338int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate; 4339int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate; 4340int_fnP_thread_t_i os::Solaris::_thr_setmutator; 4341int_fnP_thread_t os::Solaris::_thr_suspend_mutator; 4342int_fnP_thread_t os::Solaris::_thr_continue_mutator; 4343 4344// (Static) wrappers for the liblgrp API 4345os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 4346os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 4347os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 4348os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 4349os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 4350os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 4351os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 4352os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 4353 4354// (Static) wrapper for meminfo() call. 4355os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0; 4356 4357static address resolve_symbol(const char *name) { 4358 address addr; 4359 4360 addr = (address) dlsym(RTLD_DEFAULT, name); 4361 if(addr == NULL) { 4362 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 4363 addr = (address) dlsym(RTLD_NEXT, name); 4364 if(addr == NULL) { 4365 fatal(dlerror()); 4366 } 4367 } 4368 return addr; 4369} 4370 4371 4372 4373// isT2_libthread() 4374// 4375// Routine to determine if we are currently using the new T2 libthread. 4376// 4377// We determine if we are using T2 by reading /proc/self/lstatus and 4378// looking for a thread with the ASLWP bit set. If we find this status 4379// bit set, we must assume that we are NOT using T2. The T2 team 4380// has approved this algorithm. 4381// 4382// We need to determine if we are running with the new T2 libthread 4383// since setting native thread priorities is handled differently 4384// when using this library. All threads created using T2 are bound 4385// threads. Calling thr_setprio is meaningless in this case. 4386// 4387bool isT2_libthread() { 4388 int i, rslt; 4389 static prheader_t * lwpArray = NULL; 4390 static int lwpSize = 0; 4391 static int lwpFile = -1; 4392 lwpstatus_t * that; 4393 int aslwpcount; 4394 char lwpName [128]; 4395 bool isT2 = false; 4396 4397#define ADR(x) ((uintptr_t)(x)) 4398#define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1)))) 4399 4400 aslwpcount = 0; 4401 lwpSize = 16*1024; 4402 lwpArray = ( prheader_t *)NEW_C_HEAP_ARRAY (char, lwpSize); 4403 lwpFile = open ("/proc/self/lstatus", O_RDONLY, 0); 4404 if (lwpArray == NULL) { 4405 if ( ThreadPriorityVerbose ) warning ("Couldn't allocate T2 Check array\n"); 4406 return(isT2); 4407 } 4408 if (lwpFile < 0) { 4409 if ( ThreadPriorityVerbose ) warning ("Couldn't open /proc/self/lstatus\n"); 4410 return(isT2); 4411 } 4412 for (;;) { 4413 lseek (lwpFile, 0, SEEK_SET); 4414 rslt = read (lwpFile, lwpArray, lwpSize); 4415 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) { 4416 break; 4417 } 4418 FREE_C_HEAP_ARRAY(char, lwpArray); 4419 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize; 4420 lwpArray = ( prheader_t *)NEW_C_HEAP_ARRAY (char, lwpSize); 4421 if (lwpArray == NULL) { 4422 if ( ThreadPriorityVerbose ) warning ("Couldn't allocate T2 Check array\n"); 4423 return(isT2); 4424 } 4425 } 4426 4427 // We got a good snapshot - now iterate over the list. 4428 for (i = 0; i < lwpArray->pr_nent; i++ ) { 4429 that = LWPINDEX(lwpArray,i); 4430 if (that->pr_flags & PR_ASLWP) { 4431 aslwpcount++; 4432 } 4433 } 4434 if ( aslwpcount == 0 ) isT2 = true; 4435 4436 FREE_C_HEAP_ARRAY(char, lwpArray); 4437 close (lwpFile); 4438 if ( ThreadPriorityVerbose ) { 4439 if ( isT2 ) tty->print_cr("We are running with a T2 libthread\n"); 4440 else tty->print_cr("We are not running with a T2 libthread\n"); 4441 } 4442 return (isT2); 4443} 4444 4445 4446void os::Solaris::libthread_init() { 4447 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 4448 4449 // Determine if we are running with the new T2 libthread 4450 os::Solaris::set_T2_libthread(isT2_libthread()); 4451 4452 lwp_priocntl_init(); 4453 4454 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 4455 if(func == NULL) { 4456 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 4457 // Guarantee that this VM is running on an new enough OS (5.6 or 4458 // later) that it will have a new enough libthread.so. 4459 guarantee(func != NULL, "libthread.so is too old."); 4460 } 4461 4462 // Initialize the new libthread getstate API wrappers 4463 func = resolve_symbol("thr_getstate"); 4464 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func)); 4465 4466 func = resolve_symbol("thr_setstate"); 4467 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func)); 4468 4469 func = resolve_symbol("thr_setmutator"); 4470 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func)); 4471 4472 func = resolve_symbol("thr_suspend_mutator"); 4473 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func)); 4474 4475 func = resolve_symbol("thr_continue_mutator"); 4476 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func)); 4477 4478 int size; 4479 void (*handler_info_func)(address *, int *); 4480 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 4481 handler_info_func(&handler_start, &size); 4482 handler_end = handler_start + size; 4483} 4484 4485 4486int_fnP_mutex_tP os::Solaris::_mutex_lock; 4487int_fnP_mutex_tP os::Solaris::_mutex_trylock; 4488int_fnP_mutex_tP os::Solaris::_mutex_unlock; 4489int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 4490int_fnP_mutex_tP os::Solaris::_mutex_destroy; 4491int os::Solaris::_mutex_scope = USYNC_THREAD; 4492 4493int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 4494int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 4495int_fnP_cond_tP os::Solaris::_cond_signal; 4496int_fnP_cond_tP os::Solaris::_cond_broadcast; 4497int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 4498int_fnP_cond_tP os::Solaris::_cond_destroy; 4499int os::Solaris::_cond_scope = USYNC_THREAD; 4500 4501void os::Solaris::synchronization_init() { 4502 if(UseLWPSynchronization) { 4503 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 4504 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 4505 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 4506 os::Solaris::set_mutex_init(lwp_mutex_init); 4507 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 4508 os::Solaris::set_mutex_scope(USYNC_THREAD); 4509 4510 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 4511 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 4512 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 4513 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 4514 os::Solaris::set_cond_init(lwp_cond_init); 4515 os::Solaris::set_cond_destroy(lwp_cond_destroy); 4516 os::Solaris::set_cond_scope(USYNC_THREAD); 4517 } 4518 else { 4519 os::Solaris::set_mutex_scope(USYNC_THREAD); 4520 os::Solaris::set_cond_scope(USYNC_THREAD); 4521 4522 if(UsePthreads) { 4523 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 4524 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 4525 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 4526 os::Solaris::set_mutex_init(pthread_mutex_default_init); 4527 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 4528 4529 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 4530 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 4531 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 4532 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 4533 os::Solaris::set_cond_init(pthread_cond_default_init); 4534 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 4535 } 4536 else { 4537 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 4538 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 4539 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 4540 os::Solaris::set_mutex_init(::mutex_init); 4541 os::Solaris::set_mutex_destroy(::mutex_destroy); 4542 4543 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 4544 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 4545 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 4546 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 4547 os::Solaris::set_cond_init(::cond_init); 4548 os::Solaris::set_cond_destroy(::cond_destroy); 4549 } 4550 } 4551} 4552 4553void os::Solaris::liblgrp_init() { 4554 void *handle = dlopen("liblgrp.so", RTLD_LAZY); 4555 if (handle != NULL) { 4556 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 4557 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 4558 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 4559 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 4560 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 4561 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 4562 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 4563 dlsym(handle, "lgrp_cookie_stale"))); 4564 4565 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 4566 set_lgrp_cookie(c); 4567 } else { 4568 warning("your OS does not support NUMA"); 4569 } 4570} 4571 4572void os::Solaris::misc_sym_init() { 4573 address func = (address)dlsym(RTLD_DEFAULT, "meminfo"); 4574 if(func == NULL) { 4575 func = (address) dlsym(RTLD_NEXT, "meminfo"); 4576 } 4577 if (func != NULL) { 4578 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func)); 4579 } 4580} 4581 4582// Symbol doesn't exist in Solaris 8 pset.h 4583#ifndef PS_MYID 4584#define PS_MYID -3 4585#endif 4586 4587// int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 4588typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 4589static pset_getloadavg_type pset_getloadavg_ptr = NULL; 4590 4591void init_pset_getloadavg_ptr(void) { 4592 pset_getloadavg_ptr = 4593 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 4594 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) { 4595 warning("pset_getloadavg function not found"); 4596 } 4597} 4598 4599int os::Solaris::_dev_zero_fd = -1; 4600 4601// this is called _before_ the global arguments have been parsed 4602void os::init(void) { 4603 _initial_pid = getpid(); 4604 4605 max_hrtime = first_hrtime = gethrtime(); 4606 4607 init_random(1234567); 4608 4609 page_size = sysconf(_SC_PAGESIZE); 4610 if (page_size == -1) 4611 fatal1("os_solaris.cpp: os::init: sysconf failed (%s)", strerror(errno)); 4612 init_page_sizes((size_t) page_size); 4613 4614 Solaris::initialize_system_info(); 4615 4616 int fd = open("/dev/zero", O_RDWR); 4617 if (fd < 0) { 4618 fatal1("os::init: cannot open /dev/zero (%s)", strerror(errno)); 4619 } else { 4620 Solaris::set_dev_zero_fd(fd); 4621 4622 // Close on exec, child won't inherit. 4623 fcntl(fd, F_SETFD, FD_CLOEXEC); 4624 } 4625 4626 clock_tics_per_sec = CLK_TCK; 4627 4628 // check if dladdr1() exists; dladdr1 can provide more information than 4629 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 4630 // and is available on linker patches for 5.7 and 5.8. 4631 // libdl.so must have been loaded, this call is just an entry lookup 4632 void * hdl = dlopen("libdl.so", RTLD_NOW); 4633 if (hdl) 4634 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 4635 4636 // (Solaris only) this switches to calls that actually do locking. 4637 ThreadCritical::initialize(); 4638 4639 main_thread = thr_self(); 4640 4641 // Constant minimum stack size allowed. It must be at least 4642 // the minimum of what the OS supports (thr_min_stack()), and 4643 // enough to allow the thread to get to user bytecode execution. 4644 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed); 4645 // If the pagesize of the VM is greater than 8K determine the appropriate 4646 // number of initial guard pages. The user can change this with the 4647 // command line arguments, if needed. 4648 if (vm_page_size() > 8*K) { 4649 StackYellowPages = 1; 4650 StackRedPages = 1; 4651 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size(); 4652 } 4653} 4654 4655// To install functions for atexit system call 4656extern "C" { 4657 static void perfMemory_exit_helper() { 4658 perfMemory_exit(); 4659 } 4660} 4661 4662// this is called _after_ the global arguments have been parsed 4663jint os::init_2(void) { 4664 // try to enable extended file IO ASAP, see 6431278 4665 os::Solaris::try_enable_extended_io(); 4666 4667 // Allocate a single page and mark it as readable for safepoint polling. Also 4668 // use this first mmap call to check support for MAP_ALIGN. 4669 address polling_page = (address)Solaris::mmap_chunk((char*)page_size, 4670 page_size, 4671 MAP_PRIVATE | MAP_ALIGN, 4672 PROT_READ); 4673 if (polling_page == NULL) { 4674 has_map_align = false; 4675 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, 4676 PROT_READ); 4677 } 4678 4679 os::set_polling_page(polling_page); 4680 4681#ifndef PRODUCT 4682 if( Verbose && PrintMiscellaneous ) 4683 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 4684#endif 4685 4686 if (!UseMembar) { 4687 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE ); 4688 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 4689 os::set_memory_serialize_page( mem_serialize_page ); 4690 4691#ifndef PRODUCT 4692 if(Verbose && PrintMiscellaneous) 4693 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 4694#endif 4695} 4696 4697 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init()); 4698 4699 // Check minimum allowable stack size for thread creation and to initialize 4700 // the java system classes, including StackOverflowError - depends on page 4701 // size. Add a page for compiler2 recursion in main thread. 4702 // Add in BytesPerWord times page size to account for VM stack during 4703 // class initialization depending on 32 or 64 bit VM. 4704 guarantee((Solaris::min_stack_allowed >= 4705 (StackYellowPages+StackRedPages+StackShadowPages+BytesPerWord 4706 COMPILER2_PRESENT(+1)) * page_size), 4707 "need to increase Solaris::min_stack_allowed on this platform"); 4708 4709 size_t threadStackSizeInBytes = ThreadStackSize * K; 4710 if (threadStackSizeInBytes != 0 && 4711 threadStackSizeInBytes < Solaris::min_stack_allowed) { 4712 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk", 4713 Solaris::min_stack_allowed/K); 4714 return JNI_ERR; 4715 } 4716 4717 // For 64kbps there will be a 64kb page size, which makes 4718 // the usable default stack size quite a bit less. Increase the 4719 // stack for 64kb (or any > than 8kb) pages, this increases 4720 // virtual memory fragmentation (since we're not creating the 4721 // stack on a power of 2 boundary. The real fix for this 4722 // should be to fix the guard page mechanism. 4723 4724 if (vm_page_size() > 8*K) { 4725 threadStackSizeInBytes = (threadStackSizeInBytes != 0) 4726 ? threadStackSizeInBytes + 4727 ((StackYellowPages + StackRedPages) * vm_page_size()) 4728 : 0; 4729 ThreadStackSize = threadStackSizeInBytes/K; 4730 } 4731 4732 // Make the stack size a multiple of the page size so that 4733 // the yellow/red zones can be guarded. 4734 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 4735 vm_page_size())); 4736 4737 Solaris::libthread_init(); 4738 if (UseNUMA) { 4739 Solaris::liblgrp_init(); 4740 } 4741 Solaris::misc_sym_init(); 4742 Solaris::signal_sets_init(); 4743 Solaris::init_signal_mem(); 4744 Solaris::install_signal_handlers(); 4745 4746 if (libjsigversion < JSIG_VERSION_1_4_1) { 4747 Maxlibjsigsigs = OLDMAXSIGNUM; 4748 } 4749 4750 // initialize synchronization primitives to use either thread or 4751 // lwp synchronization (controlled by UseLWPSynchronization) 4752 Solaris::synchronization_init(); 4753 4754 if (MaxFDLimit) { 4755 // set the number of file descriptors to max. print out error 4756 // if getrlimit/setrlimit fails but continue regardless. 4757 struct rlimit nbr_files; 4758 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 4759 if (status != 0) { 4760 if (PrintMiscellaneous && (Verbose || WizardMode)) 4761 perror("os::init_2 getrlimit failed"); 4762 } else { 4763 nbr_files.rlim_cur = nbr_files.rlim_max; 4764 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 4765 if (status != 0) { 4766 if (PrintMiscellaneous && (Verbose || WizardMode)) 4767 perror("os::init_2 setrlimit failed"); 4768 } 4769 } 4770 } 4771 4772 // Initialize HPI. 4773 jint hpi_result = hpi::initialize(); 4774 if (hpi_result != JNI_OK) { 4775 tty->print_cr("There was an error trying to initialize the HPI library."); 4776 return hpi_result; 4777 } 4778 4779 // Calculate theoretical max. size of Threads to guard gainst 4780 // artifical out-of-memory situations, where all available address- 4781 // space has been reserved by thread stacks. Default stack size is 1Mb. 4782 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 4783 JavaThread::stack_size_at_create() : (1*K*K); 4784 assert(pre_thread_stack_size != 0, "Must have a stack"); 4785 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 4786 // we should start doing Virtual Memory banging. Currently when the threads will 4787 // have used all but 200Mb of space. 4788 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 4789 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 4790 4791 // at-exit methods are called in the reverse order of their registration. 4792 // In Solaris 7 and earlier, atexit functions are called on return from 4793 // main or as a result of a call to exit(3C). There can be only 32 of 4794 // these functions registered and atexit() does not set errno. In Solaris 4795 // 8 and later, there is no limit to the number of functions registered 4796 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 4797 // functions are called upon dlclose(3DL) in addition to return from main 4798 // and exit(3C). 4799 4800 if (PerfAllowAtExitRegistration) { 4801 // only register atexit functions if PerfAllowAtExitRegistration is set. 4802 // atexit functions can be delayed until process exit time, which 4803 // can be problematic for embedded VM situations. Embedded VMs should 4804 // call DestroyJavaVM() to assure that VM resources are released. 4805 4806 // note: perfMemory_exit_helper atexit function may be removed in 4807 // the future if the appropriate cleanup code can be added to the 4808 // VM_Exit VMOperation's doit method. 4809 if (atexit(perfMemory_exit_helper) != 0) { 4810 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 4811 } 4812 } 4813 4814 // Init pset_loadavg function pointer 4815 init_pset_getloadavg_ptr(); 4816 4817 return JNI_OK; 4818} 4819 4820 4821// Mark the polling page as unreadable 4822void os::make_polling_page_unreadable(void) { 4823 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 ) 4824 fatal("Could not disable polling page"); 4825}; 4826 4827// Mark the polling page as readable 4828void os::make_polling_page_readable(void) { 4829 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 ) 4830 fatal("Could not enable polling page"); 4831}; 4832 4833// OS interface. 4834 4835int os::stat(const char *path, struct stat *sbuf) { 4836 char pathbuf[MAX_PATH]; 4837 if (strlen(path) > MAX_PATH - 1) { 4838 errno = ENAMETOOLONG; 4839 return -1; 4840 } 4841 hpi::native_path(strcpy(pathbuf, path)); 4842 return ::stat(pathbuf, sbuf); 4843} 4844 4845 4846bool os::check_heap(bool force) { return true; } 4847 4848typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr); 4849static vsnprintf_t sol_vsnprintf = NULL; 4850 4851int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) { 4852 if (!sol_vsnprintf) { 4853 //search for the named symbol in the objects that were loaded after libjvm 4854 void* where = RTLD_NEXT; 4855 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL) 4856 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf")); 4857 if (!sol_vsnprintf){ 4858 //search for the named symbol in the objects that were loaded before libjvm 4859 where = RTLD_DEFAULT; 4860 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL) 4861 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf")); 4862 assert(sol_vsnprintf != NULL, "vsnprintf not found"); 4863 } 4864 } 4865 return (*sol_vsnprintf)(buf, count, fmt, argptr); 4866} 4867 4868 4869// Is a (classpath) directory empty? 4870bool os::dir_is_empty(const char* path) { 4871 DIR *dir = NULL; 4872 struct dirent *ptr; 4873 4874 dir = opendir(path); 4875 if (dir == NULL) return true; 4876 4877 /* Scan the directory */ 4878 bool result = true; 4879 char buf[sizeof(struct dirent) + MAX_PATH]; 4880 struct dirent *dbuf = (struct dirent *) buf; 4881 while (result && (ptr = readdir(dir, dbuf)) != NULL) { 4882 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 4883 result = false; 4884 } 4885 } 4886 closedir(dir); 4887 return result; 4888} 4889 4890// create binary file, rewriting existing file if required 4891int os::create_binary_file(const char* path, bool rewrite_existing) { 4892 int oflags = O_WRONLY | O_CREAT; 4893 if (!rewrite_existing) { 4894 oflags |= O_EXCL; 4895 } 4896 return ::open64(path, oflags, S_IREAD | S_IWRITE); 4897} 4898 4899// return current position of file pointer 4900jlong os::current_file_offset(int fd) { 4901 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 4902} 4903 4904// move file pointer to the specified offset 4905jlong os::seek_to_file_offset(int fd, jlong offset) { 4906 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 4907} 4908 4909// Map a block of memory. 4910char* os::map_memory(int fd, const char* file_name, size_t file_offset, 4911 char *addr, size_t bytes, bool read_only, 4912 bool allow_exec) { 4913 int prot; 4914 int flags; 4915 4916 if (read_only) { 4917 prot = PROT_READ; 4918 flags = MAP_SHARED; 4919 } else { 4920 prot = PROT_READ | PROT_WRITE; 4921 flags = MAP_PRIVATE; 4922 } 4923 4924 if (allow_exec) { 4925 prot |= PROT_EXEC; 4926 } 4927 4928 if (addr != NULL) { 4929 flags |= MAP_FIXED; 4930 } 4931 4932 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 4933 fd, file_offset); 4934 if (mapped_address == MAP_FAILED) { 4935 return NULL; 4936 } 4937 return mapped_address; 4938} 4939 4940 4941// Remap a block of memory. 4942char* os::remap_memory(int fd, const char* file_name, size_t file_offset, 4943 char *addr, size_t bytes, bool read_only, 4944 bool allow_exec) { 4945 // same as map_memory() on this OS 4946 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4947 allow_exec); 4948} 4949 4950 4951// Unmap a block of memory. 4952bool os::unmap_memory(char* addr, size_t bytes) { 4953 return munmap(addr, bytes) == 0; 4954} 4955 4956void os::pause() { 4957 char filename[MAX_PATH]; 4958 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4959 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4960 } else { 4961 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4962 } 4963 4964 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4965 if (fd != -1) { 4966 struct stat buf; 4967 close(fd); 4968 while (::stat(filename, &buf) == 0) { 4969 (void)::poll(NULL, 0, 100); 4970 } 4971 } else { 4972 jio_fprintf(stderr, 4973 "Could not open pause file '%s', continuing immediately.\n", filename); 4974 } 4975} 4976 4977#ifndef PRODUCT 4978#ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4979// Turn this on if you need to trace synch operations. 4980// Set RECORD_SYNCH_LIMIT to a large-enough value, 4981// and call record_synch_enable and record_synch_disable 4982// around the computation of interest. 4983 4984void record_synch(char* name, bool returning); // defined below 4985 4986class RecordSynch { 4987 char* _name; 4988 public: 4989 RecordSynch(char* name) :_name(name) 4990 { record_synch(_name, false); } 4991 ~RecordSynch() { record_synch(_name, true); } 4992}; 4993 4994#define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 4995extern "C" ret name params { \ 4996 typedef ret name##_t params; \ 4997 static name##_t* implem = NULL; \ 4998 static int callcount = 0; \ 4999 if (implem == NULL) { \ 5000 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 5001 if (implem == NULL) fatal(dlerror()); \ 5002 } \ 5003 ++callcount; \ 5004 RecordSynch _rs(#name); \ 5005 inner; \ 5006 return implem args; \ 5007} 5008// in dbx, examine callcounts this way: 5009// for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 5010 5011#define CHECK_POINTER_OK(p) \ 5012 (Universe::perm_gen() == NULL || !Universe::is_reserved_heap((oop)(p))) 5013#define CHECK_MU \ 5014 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 5015#define CHECK_CV \ 5016 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 5017#define CHECK_P(p) \ 5018 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 5019 5020#define CHECK_MUTEX(mutex_op) \ 5021CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 5022 5023CHECK_MUTEX( mutex_lock) 5024CHECK_MUTEX( _mutex_lock) 5025CHECK_MUTEX( mutex_unlock) 5026CHECK_MUTEX(_mutex_unlock) 5027CHECK_MUTEX( mutex_trylock) 5028CHECK_MUTEX(_mutex_trylock) 5029 5030#define CHECK_COND(cond_op) \ 5031CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV); 5032 5033CHECK_COND( cond_wait); 5034CHECK_COND(_cond_wait); 5035CHECK_COND(_cond_wait_cancel); 5036 5037#define CHECK_COND2(cond_op) \ 5038CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV); 5039 5040CHECK_COND2( cond_timedwait); 5041CHECK_COND2(_cond_timedwait); 5042CHECK_COND2(_cond_timedwait_cancel); 5043 5044// do the _lwp_* versions too 5045#define mutex_t lwp_mutex_t 5046#define cond_t lwp_cond_t 5047CHECK_MUTEX( _lwp_mutex_lock) 5048CHECK_MUTEX( _lwp_mutex_unlock) 5049CHECK_MUTEX( _lwp_mutex_trylock) 5050CHECK_MUTEX( __lwp_mutex_lock) 5051CHECK_MUTEX( __lwp_mutex_unlock) 5052CHECK_MUTEX( __lwp_mutex_trylock) 5053CHECK_MUTEX(___lwp_mutex_lock) 5054CHECK_MUTEX(___lwp_mutex_unlock) 5055 5056CHECK_COND( _lwp_cond_wait); 5057CHECK_COND( __lwp_cond_wait); 5058CHECK_COND(___lwp_cond_wait); 5059 5060CHECK_COND2( _lwp_cond_timedwait); 5061CHECK_COND2( __lwp_cond_timedwait); 5062#undef mutex_t 5063#undef cond_t 5064 5065CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 5066CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 5067CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 5068CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 5069CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 5070CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 5071CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 5072CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 5073 5074 5075// recording machinery: 5076 5077enum { RECORD_SYNCH_LIMIT = 200 }; 5078char* record_synch_name[RECORD_SYNCH_LIMIT]; 5079void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 5080bool record_synch_returning[RECORD_SYNCH_LIMIT]; 5081thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 5082int record_synch_count = 0; 5083bool record_synch_enabled = false; 5084 5085// in dbx, examine recorded data this way: 5086// for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 5087 5088void record_synch(char* name, bool returning) { 5089 if (record_synch_enabled) { 5090 if (record_synch_count < RECORD_SYNCH_LIMIT) { 5091 record_synch_name[record_synch_count] = name; 5092 record_synch_returning[record_synch_count] = returning; 5093 record_synch_thread[record_synch_count] = thr_self(); 5094 record_synch_arg0ptr[record_synch_count] = &name; 5095 record_synch_count++; 5096 } 5097 // put more checking code here: 5098 // ... 5099 } 5100} 5101 5102void record_synch_enable() { 5103 // start collecting trace data, if not already doing so 5104 if (!record_synch_enabled) record_synch_count = 0; 5105 record_synch_enabled = true; 5106} 5107 5108void record_synch_disable() { 5109 // stop collecting trace data 5110 record_synch_enabled = false; 5111} 5112 5113#endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 5114#endif // PRODUCT 5115 5116const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 5117const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 5118 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 5119 5120 5121// JVMTI & JVM monitoring and management support 5122// The thread_cpu_time() and current_thread_cpu_time() are only 5123// supported if is_thread_cpu_time_supported() returns true. 5124// They are not supported on Solaris T1. 5125 5126// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 5127// are used by JVM M&M and JVMTI to get user+sys or user CPU time 5128// of a thread. 5129// 5130// current_thread_cpu_time() and thread_cpu_time(Thread *) 5131// returns the fast estimate available on the platform. 5132 5133// hrtime_t gethrvtime() return value includes 5134// user time but does not include system time 5135jlong os::current_thread_cpu_time() { 5136 return (jlong) gethrvtime(); 5137} 5138 5139jlong os::thread_cpu_time(Thread *thread) { 5140 // return user level CPU time only to be consistent with 5141 // what current_thread_cpu_time returns. 5142 // thread_cpu_time_info() must be changed if this changes 5143 return os::thread_cpu_time(thread, false /* user time only */); 5144} 5145 5146jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 5147 if (user_sys_cpu_time) { 5148 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 5149 } else { 5150 return os::current_thread_cpu_time(); 5151 } 5152} 5153 5154jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 5155 char proc_name[64]; 5156 int count; 5157 prusage_t prusage; 5158 jlong lwp_time; 5159 int fd; 5160 5161 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 5162 getpid(), 5163 thread->osthread()->lwp_id()); 5164 fd = open(proc_name, O_RDONLY); 5165 if ( fd == -1 ) return -1; 5166 5167 do { 5168 count = pread(fd, 5169 (void *)&prusage.pr_utime, 5170 thr_time_size, 5171 thr_time_off); 5172 } while (count < 0 && errno == EINTR); 5173 close(fd); 5174 if ( count < 0 ) return -1; 5175 5176 if (user_sys_cpu_time) { 5177 // user + system CPU time 5178 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 5179 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 5180 (jlong)prusage.pr_stime.tv_nsec + 5181 (jlong)prusage.pr_utime.tv_nsec; 5182 } else { 5183 // user level CPU time only 5184 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 5185 (jlong)prusage.pr_utime.tv_nsec; 5186 } 5187 5188 return(lwp_time); 5189} 5190 5191void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5192 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5193 info_ptr->may_skip_backward = false; // elapsed time not wall time 5194 info_ptr->may_skip_forward = false; // elapsed time not wall time 5195 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5196} 5197 5198void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5199 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5200 info_ptr->may_skip_backward = false; // elapsed time not wall time 5201 info_ptr->may_skip_forward = false; // elapsed time not wall time 5202 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5203} 5204 5205bool os::is_thread_cpu_time_supported() { 5206 if ( os::Solaris::T2_libthread() || UseBoundThreads ) { 5207 return true; 5208 } else { 5209 return false; 5210 } 5211} 5212 5213// System loadavg support. Returns -1 if load average cannot be obtained. 5214// Return the load average for our processor set if the primitive exists 5215// (Solaris 9 and later). Otherwise just return system wide loadavg. 5216int os::loadavg(double loadavg[], int nelem) { 5217 if (pset_getloadavg_ptr != NULL) { 5218 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 5219 } else { 5220 return ::getloadavg(loadavg, nelem); 5221 } 5222} 5223 5224//--------------------------------------------------------------------------------- 5225#ifndef PRODUCT 5226 5227static address same_page(address x, address y) { 5228 intptr_t page_bits = -os::vm_page_size(); 5229 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits)) 5230 return x; 5231 else if (x > y) 5232 return (address)(intptr_t(y) | ~page_bits) + 1; 5233 else 5234 return (address)(intptr_t(y) & page_bits); 5235} 5236 5237bool os::find(address addr) { 5238 Dl_info dlinfo; 5239 memset(&dlinfo, 0, sizeof(dlinfo)); 5240 if (dladdr(addr, &dlinfo)) { 5241#ifdef _LP64 5242 tty->print("0x%016lx: ", addr); 5243#else 5244 tty->print("0x%08x: ", addr); 5245#endif 5246 if (dlinfo.dli_sname != NULL) 5247 tty->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 5248 else if (dlinfo.dli_fname) 5249 tty->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 5250 else 5251 tty->print("<absolute address>"); 5252 if (dlinfo.dli_fname) tty->print(" in %s", dlinfo.dli_fname); 5253#ifdef _LP64 5254 if (dlinfo.dli_fbase) tty->print(" at 0x%016lx", dlinfo.dli_fbase); 5255#else 5256 if (dlinfo.dli_fbase) tty->print(" at 0x%08x", dlinfo.dli_fbase); 5257#endif 5258 tty->cr(); 5259 5260 if (Verbose) { 5261 // decode some bytes around the PC 5262 address begin = same_page(addr-40, addr); 5263 address end = same_page(addr+40, addr); 5264 address lowest = (address) dlinfo.dli_sname; 5265 if (!lowest) lowest = (address) dlinfo.dli_fbase; 5266 if (begin < lowest) begin = lowest; 5267 Dl_info dlinfo2; 5268 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr 5269 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) 5270 end = (address) dlinfo2.dli_saddr; 5271 Disassembler::decode(begin, end); 5272 } 5273 return true; 5274 } 5275 return false; 5276} 5277 5278#endif 5279 5280 5281// Following function has been added to support HotSparc's libjvm.so running 5282// under Solaris production JDK 1.2.2 / 1.3.0. These came from 5283// src/solaris/hpi/native_threads in the EVM codebase. 5284// 5285// NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 5286// libraries and should thus be removed. We will leave it behind for a while 5287// until we no longer want to able to run on top of 1.3.0 Solaris production 5288// JDK. See 4341971. 5289 5290#define STACK_SLACK 0x800 5291 5292extern "C" { 5293 intptr_t sysThreadAvailableStackWithSlack() { 5294 stack_t st; 5295 intptr_t retval, stack_top; 5296 retval = thr_stksegment(&st); 5297 assert(retval == 0, "incorrect return value from thr_stksegment"); 5298 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 5299 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 5300 stack_top=(intptr_t)st.ss_sp-st.ss_size; 5301 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 5302 } 5303} 5304 5305// Just to get the Kernel build to link on solaris for testing. 5306 5307extern "C" { 5308class ASGCT_CallTrace; 5309void AsyncGetCallTrace(ASGCT_CallTrace *trace, jint depth, void* ucontext) 5310 KERNEL_RETURN; 5311} 5312 5313 5314// ObjectMonitor park-unpark infrastructure ... 5315// 5316// We implement Solaris and Linux PlatformEvents with the 5317// obvious condvar-mutex-flag triple. 5318// Another alternative that works quite well is pipes: 5319// Each PlatformEvent consists of a pipe-pair. 5320// The thread associated with the PlatformEvent 5321// calls park(), which reads from the input end of the pipe. 5322// Unpark() writes into the other end of the pipe. 5323// The write-side of the pipe must be set NDELAY. 5324// Unfortunately pipes consume a large # of handles. 5325// Native solaris lwp_park() and lwp_unpark() work nicely, too. 5326// Using pipes for the 1st few threads might be workable, however. 5327// 5328// park() is permitted to return spuriously. 5329// Callers of park() should wrap the call to park() in 5330// an appropriate loop. A litmus test for the correct 5331// usage of park is the following: if park() were modified 5332// to immediately return 0 your code should still work, 5333// albeit degenerating to a spin loop. 5334// 5335// An interesting optimization for park() is to use a trylock() 5336// to attempt to acquire the mutex. If the trylock() fails 5337// then we know that a concurrent unpark() operation is in-progress. 5338// in that case the park() code could simply set _count to 0 5339// and return immediately. The subsequent park() operation *might* 5340// return immediately. That's harmless as the caller of park() is 5341// expected to loop. By using trylock() we will have avoided a 5342// avoided a context switch caused by contention on the per-thread mutex. 5343// 5344// TODO-FIXME: 5345// 1. Reconcile Doug's JSR166 j.u.c park-unpark with the 5346// objectmonitor implementation. 5347// 2. Collapse the JSR166 parker event, and the 5348// objectmonitor ParkEvent into a single "Event" construct. 5349// 3. In park() and unpark() add: 5350// assert (Thread::current() == AssociatedWith). 5351// 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch. 5352// 1-out-of-N park() operations will return immediately. 5353// 5354// _Event transitions in park() 5355// -1 => -1 : illegal 5356// 1 => 0 : pass - return immediately 5357// 0 => -1 : block 5358// 5359// _Event serves as a restricted-range semaphore. 5360// 5361// Another possible encoding of _Event would be with 5362// explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5363// 5364// TODO-FIXME: add DTRACE probes for: 5365// 1. Tx parks 5366// 2. Ty unparks Tx 5367// 3. Tx resumes from park 5368 5369 5370// value determined through experimentation 5371#define ROUNDINGFIX 11 5372 5373// utility to compute the abstime argument to timedwait. 5374// TODO-FIXME: switch from compute_abstime() to unpackTime(). 5375 5376static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 5377 // millis is the relative timeout time 5378 // abstime will be the absolute timeout time 5379 if (millis < 0) millis = 0; 5380 struct timeval now; 5381 int status = gettimeofday(&now, NULL); 5382 assert(status == 0, "gettimeofday"); 5383 jlong seconds = millis / 1000; 5384 jlong max_wait_period; 5385 5386 if (UseLWPSynchronization) { 5387 // forward port of fix for 4275818 (not sleeping long enough) 5388 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 5389 // _lwp_cond_timedwait() used a round_down algorithm rather 5390 // than a round_up. For millis less than our roundfactor 5391 // it rounded down to 0 which doesn't meet the spec. 5392 // For millis > roundfactor we may return a bit sooner, but 5393 // since we can not accurately identify the patch level and 5394 // this has already been fixed in Solaris 9 and 8 we will 5395 // leave it alone rather than always rounding down. 5396 5397 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 5398 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 5399 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 5400 max_wait_period = 21000000; 5401 } else { 5402 max_wait_period = 50000000; 5403 } 5404 millis %= 1000; 5405 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 5406 seconds = max_wait_period; 5407 } 5408 abstime->tv_sec = now.tv_sec + seconds; 5409 long usec = now.tv_usec + millis * 1000; 5410 if (usec >= 1000000) { 5411 abstime->tv_sec += 1; 5412 usec -= 1000000; 5413 } 5414 abstime->tv_nsec = usec * 1000; 5415 return abstime; 5416} 5417 5418// Test-and-clear _Event, always leaves _Event set to 0, returns immediately. 5419// Conceptually TryPark() should be equivalent to park(0). 5420 5421int os::PlatformEvent::TryPark() { 5422 for (;;) { 5423 const int v = _Event ; 5424 guarantee ((v == 0) || (v == 1), "invariant") ; 5425 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; 5426 } 5427} 5428 5429void os::PlatformEvent::park() { // AKA: down() 5430 // Invariant: Only the thread associated with the Event/PlatformEvent 5431 // may call park(). 5432 int v ; 5433 for (;;) { 5434 v = _Event ; 5435 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 5436 } 5437 guarantee (v >= 0, "invariant") ; 5438 if (v == 0) { 5439 // Do this the hard way by blocking ... 5440 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5441 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5442 // Only for SPARC >= V8PlusA 5443#if defined(__sparc) && defined(COMPILER2) 5444 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 5445#endif 5446 int status = os::Solaris::mutex_lock(_mutex); 5447 assert_status(status == 0, status, "mutex_lock"); 5448 guarantee (_nParked == 0, "invariant") ; 5449 ++ _nParked ; 5450 while (_Event < 0) { 5451 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 5452 // Treat this the same as if the wait was interrupted 5453 // With usr/lib/lwp going to kernel, always handle ETIME 5454 status = os::Solaris::cond_wait(_cond, _mutex); 5455 if (status == ETIME) status = EINTR ; 5456 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 5457 } 5458 -- _nParked ; 5459 _Event = 0 ; 5460 status = os::Solaris::mutex_unlock(_mutex); 5461 assert_status(status == 0, status, "mutex_unlock"); 5462 } 5463} 5464 5465int os::PlatformEvent::park(jlong millis) { 5466 guarantee (_nParked == 0, "invariant") ; 5467 int v ; 5468 for (;;) { 5469 v = _Event ; 5470 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 5471 } 5472 guarantee (v >= 0, "invariant") ; 5473 if (v != 0) return OS_OK ; 5474 5475 int ret = OS_TIMEOUT; 5476 timestruc_t abst; 5477 compute_abstime (&abst, millis); 5478 5479 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5480 // For Solaris SPARC set fprs.FEF=0 prior to parking. 5481 // Only for SPARC >= V8PlusA 5482#if defined(__sparc) && defined(COMPILER2) 5483 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 5484#endif 5485 int status = os::Solaris::mutex_lock(_mutex); 5486 assert_status(status == 0, status, "mutex_lock"); 5487 guarantee (_nParked == 0, "invariant") ; 5488 ++ _nParked ; 5489 while (_Event < 0) { 5490 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 5491 assert_status(status == 0 || status == EINTR || 5492 status == ETIME || status == ETIMEDOUT, 5493 status, "cond_timedwait"); 5494 if (!FilterSpuriousWakeups) break ; // previous semantics 5495 if (status == ETIME || status == ETIMEDOUT) break ; 5496 // We consume and ignore EINTR and spurious wakeups. 5497 } 5498 -- _nParked ; 5499 if (_Event >= 0) ret = OS_OK ; 5500 _Event = 0 ; 5501 status = os::Solaris::mutex_unlock(_mutex); 5502 assert_status(status == 0, status, "mutex_unlock"); 5503 return ret; 5504} 5505 5506void os::PlatformEvent::unpark() { 5507 int v, AnyWaiters; 5508 5509 // Increment _Event. 5510 // Another acceptable implementation would be to simply swap 1 5511 // into _Event: 5512 // if (Swap (&_Event, 1) < 0) { 5513 // mutex_lock (_mutex) ; AnyWaiters = nParked; mutex_unlock (_mutex) ; 5514 // if (AnyWaiters) cond_signal (_cond) ; 5515 // } 5516 5517 for (;;) { 5518 v = _Event ; 5519 if (v > 0) { 5520 // The LD of _Event could have reordered or be satisfied 5521 // by a read-aside from this processor's write buffer. 5522 // To avoid problems execute a barrier and then 5523 // ratify the value. A degenerate CAS() would also work. 5524 // Viz., CAS (v+0, &_Event, v) == v). 5525 OrderAccess::fence() ; 5526 if (_Event == v) return ; 5527 continue ; 5528 } 5529 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; 5530 } 5531 5532 // If the thread associated with the event was parked, wake it. 5533 if (v < 0) { 5534 int status ; 5535 // Wait for the thread assoc with the PlatformEvent to vacate. 5536 status = os::Solaris::mutex_lock(_mutex); 5537 assert_status(status == 0, status, "mutex_lock"); 5538 AnyWaiters = _nParked ; 5539 status = os::Solaris::mutex_unlock(_mutex); 5540 assert_status(status == 0, status, "mutex_unlock"); 5541 guarantee (AnyWaiters == 0 || AnyWaiters == 1, "invariant") ; 5542 if (AnyWaiters != 0) { 5543 // We intentional signal *after* dropping the lock 5544 // to avoid a common class of futile wakeups. 5545 status = os::Solaris::cond_signal(_cond); 5546 assert_status(status == 0, status, "cond_signal"); 5547 } 5548 } 5549} 5550 5551// JSR166 5552// ------------------------------------------------------- 5553 5554/* 5555 * The solaris and linux implementations of park/unpark are fairly 5556 * conservative for now, but can be improved. They currently use a 5557 * mutex/condvar pair, plus _counter. 5558 * Park decrements _counter if > 0, else does a condvar wait. Unpark 5559 * sets count to 1 and signals condvar. Only one thread ever waits 5560 * on the condvar. Contention seen when trying to park implies that someone 5561 * is unparking you, so don't wait. And spurious returns are fine, so there 5562 * is no need to track notifications. 5563 */ 5564 5565#define NANOSECS_PER_SEC 1000000000 5566#define NANOSECS_PER_MILLISEC 1000000 5567#define MAX_SECS 100000000 5568 5569/* 5570 * This code is common to linux and solaris and will be moved to a 5571 * common place in dolphin. 5572 * 5573 * The passed in time value is either a relative time in nanoseconds 5574 * or an absolute time in milliseconds. Either way it has to be unpacked 5575 * into suitable seconds and nanoseconds components and stored in the 5576 * given timespec structure. 5577 * Given time is a 64-bit value and the time_t used in the timespec is only 5578 * a signed-32-bit value (except on 64-bit Linux) we have to watch for 5579 * overflow if times way in the future are given. Further on Solaris versions 5580 * prior to 10 there is a restriction (see cond_timedwait) that the specified 5581 * number of seconds, in abstime, is less than current_time + 100,000,000. 5582 * As it will be 28 years before "now + 100000000" will overflow we can 5583 * ignore overflow and just impose a hard-limit on seconds using the value 5584 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 5585 * years from "now". 5586 */ 5587static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 5588 assert (time > 0, "convertTime"); 5589 5590 struct timeval now; 5591 int status = gettimeofday(&now, NULL); 5592 assert(status == 0, "gettimeofday"); 5593 5594 time_t max_secs = now.tv_sec + MAX_SECS; 5595 5596 if (isAbsolute) { 5597 jlong secs = time / 1000; 5598 if (secs > max_secs) { 5599 absTime->tv_sec = max_secs; 5600 } 5601 else { 5602 absTime->tv_sec = secs; 5603 } 5604 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 5605 } 5606 else { 5607 jlong secs = time / NANOSECS_PER_SEC; 5608 if (secs >= MAX_SECS) { 5609 absTime->tv_sec = max_secs; 5610 absTime->tv_nsec = 0; 5611 } 5612 else { 5613 absTime->tv_sec = now.tv_sec + secs; 5614 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 5615 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 5616 absTime->tv_nsec -= NANOSECS_PER_SEC; 5617 ++absTime->tv_sec; // note: this must be <= max_secs 5618 } 5619 } 5620 } 5621 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 5622 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 5623 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 5624 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 5625} 5626 5627void Parker::park(bool isAbsolute, jlong time) { 5628 5629 // Optional fast-path check: 5630 // Return immediately if a permit is available. 5631 if (_counter > 0) { 5632 _counter = 0 ; 5633 return ; 5634 } 5635 5636 // Optional fast-exit: Check interrupt before trying to wait 5637 Thread* thread = Thread::current(); 5638 assert(thread->is_Java_thread(), "Must be JavaThread"); 5639 JavaThread *jt = (JavaThread *)thread; 5640 if (Thread::is_interrupted(thread, false)) { 5641 return; 5642 } 5643 5644 // First, demultiplex/decode time arguments 5645 timespec absTime; 5646 if (time < 0) { // don't wait at all 5647 return; 5648 } 5649 if (time > 0) { 5650 // Warning: this code might be exposed to the old Solaris time 5651 // round-down bugs. Grep "roundingFix" for details. 5652 unpackTime(&absTime, isAbsolute, time); 5653 } 5654 5655 // Enter safepoint region 5656 // Beware of deadlocks such as 6317397. 5657 // The per-thread Parker:: _mutex is a classic leaf-lock. 5658 // In particular a thread must never block on the Threads_lock while 5659 // holding the Parker:: mutex. If safepoints are pending both the 5660 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 5661 ThreadBlockInVM tbivm(jt); 5662 5663 // Don't wait if cannot get lock since interference arises from 5664 // unblocking. Also. check interrupt before trying wait 5665 if (Thread::is_interrupted(thread, false) || 5666 os::Solaris::mutex_trylock(_mutex) != 0) { 5667 return; 5668 } 5669 5670 int status ; 5671 5672 if (_counter > 0) { // no wait needed 5673 _counter = 0; 5674 status = os::Solaris::mutex_unlock(_mutex); 5675 assert (status == 0, "invariant") ; 5676 return; 5677 } 5678 5679#ifdef ASSERT 5680 // Don't catch signals while blocked; let the running threads have the signals. 5681 // (This allows a debugger to break into the running thread.) 5682 sigset_t oldsigs; 5683 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals(); 5684 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 5685#endif 5686 5687 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5688 jt->set_suspend_equivalent(); 5689 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 5690 5691 // Do this the hard way by blocking ... 5692 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5693 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5694 // Only for SPARC >= V8PlusA 5695#if defined(__sparc) && defined(COMPILER2) 5696 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 5697#endif 5698 5699 if (time == 0) { 5700 status = os::Solaris::cond_wait (_cond, _mutex) ; 5701 } else { 5702 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 5703 } 5704 // Note that an untimed cond_wait() can sometimes return ETIME on older 5705 // versions of the Solaris. 5706 assert_status(status == 0 || status == EINTR || 5707 status == ETIME || status == ETIMEDOUT, 5708 status, "cond_timedwait"); 5709 5710#ifdef ASSERT 5711 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL); 5712#endif 5713 _counter = 0 ; 5714 status = os::Solaris::mutex_unlock(_mutex); 5715 assert_status(status == 0, status, "mutex_unlock") ; 5716 5717 // If externally suspended while waiting, re-suspend 5718 if (jt->handle_special_suspend_equivalent_condition()) { 5719 jt->java_suspend_self(); 5720 } 5721 5722} 5723 5724void Parker::unpark() { 5725 int s, status ; 5726 status = os::Solaris::mutex_lock (_mutex) ; 5727 assert (status == 0, "invariant") ; 5728 s = _counter; 5729 _counter = 1; 5730 status = os::Solaris::mutex_unlock (_mutex) ; 5731 assert (status == 0, "invariant") ; 5732 5733 if (s < 1) { 5734 status = os::Solaris::cond_signal (_cond) ; 5735 assert (status == 0, "invariant") ; 5736 } 5737} 5738 5739extern char** environ; 5740 5741// Run the specified command in a separate process. Return its exit value, 5742// or -1 on failure (e.g. can't fork a new process). 5743// Unlike system(), this function can be called from signal handler. It 5744// doesn't block SIGINT et al. 5745int os::fork_and_exec(char* cmd) { 5746 char * argv[4]; 5747 argv[0] = (char *)"sh"; 5748 argv[1] = (char *)"-c"; 5749 argv[2] = cmd; 5750 argv[3] = NULL; 5751 5752 // fork is async-safe, fork1 is not so can't use in signal handler 5753 pid_t pid; 5754 Thread* t = ThreadLocalStorage::get_thread_slow(); 5755 if (t != NULL && t->is_inside_signal_handler()) { 5756 pid = fork(); 5757 } else { 5758 pid = fork1(); 5759 } 5760 5761 if (pid < 0) { 5762 // fork failed 5763 warning("fork failed: %s", strerror(errno)); 5764 return -1; 5765 5766 } else if (pid == 0) { 5767 // child process 5768 5769 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 5770 execve("/usr/bin/sh", argv, environ); 5771 5772 // execve failed 5773 _exit(-1); 5774 5775 } else { 5776 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5777 // care about the actual exit code, for now. 5778 5779 int status; 5780 5781 // Wait for the child process to exit. This returns immediately if 5782 // the child has already exited. */ 5783 while (waitpid(pid, &status, 0) < 0) { 5784 switch (errno) { 5785 case ECHILD: return 0; 5786 case EINTR: break; 5787 default: return -1; 5788 } 5789 } 5790 5791 if (WIFEXITED(status)) { 5792 // The child exited normally; get its exit code. 5793 return WEXITSTATUS(status); 5794 } else if (WIFSIGNALED(status)) { 5795 // The child exited because of a signal 5796 // The best value to return is 0x80 + signal number, 5797 // because that is what all Unix shells do, and because 5798 // it allows callers to distinguish between process exit and 5799 // process death by signal. 5800 return 0x80 + WTERMSIG(status); 5801 } else { 5802 // Unknown exit code; pass it through 5803 return status; 5804 } 5805 } 5806} 5807