1/* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25// no precompiled headers 26#include "classfile/classLoader.hpp" 27#include "classfile/systemDictionary.hpp" 28#include "classfile/vmSymbols.hpp" 29#include "code/icBuffer.hpp" 30#include "code/vtableStubs.hpp" 31#include "compiler/compileBroker.hpp" 32#include "compiler/disassembler.hpp" 33#include "interpreter/interpreter.hpp" 34#include "jvm_solaris.h" 35#include "logging/log.hpp" 36#include "memory/allocation.inline.hpp" 37#include "memory/filemap.hpp" 38#include "oops/oop.inline.hpp" 39#include "os_share_solaris.hpp" 40#include "os_solaris.inline.hpp" 41#include "prims/jniFastGetField.hpp" 42#include "prims/jvm.h" 43#include "prims/jvm_misc.hpp" 44#include "runtime/arguments.hpp" 45#include "runtime/atomic.hpp" 46#include "runtime/extendedPC.hpp" 47#include "runtime/globals.hpp" 48#include "runtime/interfaceSupport.hpp" 49#include "runtime/java.hpp" 50#include "runtime/javaCalls.hpp" 51#include "runtime/mutexLocker.hpp" 52#include "runtime/objectMonitor.hpp" 53#include "runtime/orderAccess.inline.hpp" 54#include "runtime/osThread.hpp" 55#include "runtime/perfMemory.hpp" 56#include "runtime/sharedRuntime.hpp" 57#include "runtime/statSampler.hpp" 58#include "runtime/stubRoutines.hpp" 59#include "runtime/thread.inline.hpp" 60#include "runtime/threadCritical.hpp" 61#include "runtime/timer.hpp" 62#include "runtime/vm_version.hpp" 63#include "semaphore_posix.hpp" 64#include "services/attachListener.hpp" 65#include "services/memTracker.hpp" 66#include "services/runtimeService.hpp" 67#include "utilities/decoder.hpp" 68#include "utilities/defaultStream.hpp" 69#include "utilities/events.hpp" 70#include "utilities/growableArray.hpp" 71#include "utilities/macros.hpp" 72#include "utilities/vmError.hpp" 73 74// put OS-includes here 75# include <dlfcn.h> 76# include <errno.h> 77# include <exception> 78# include <link.h> 79# include <poll.h> 80# include <pthread.h> 81# include <schedctl.h> 82# include <setjmp.h> 83# include <signal.h> 84# include <stdio.h> 85# include <alloca.h> 86# include <sys/filio.h> 87# include <sys/ipc.h> 88# include <sys/lwp.h> 89# include <sys/machelf.h> // for elf Sym structure used by dladdr1 90# include <sys/mman.h> 91# include <sys/processor.h> 92# include <sys/procset.h> 93# include <sys/pset.h> 94# include <sys/resource.h> 95# include <sys/shm.h> 96# include <sys/socket.h> 97# include <sys/stat.h> 98# include <sys/systeminfo.h> 99# include <sys/time.h> 100# include <sys/times.h> 101# include <sys/types.h> 102# include <sys/wait.h> 103# include <sys/utsname.h> 104# include <thread.h> 105# include <unistd.h> 106# include <sys/priocntl.h> 107# include <sys/rtpriocntl.h> 108# include <sys/tspriocntl.h> 109# include <sys/iapriocntl.h> 110# include <sys/fxpriocntl.h> 111# include <sys/loadavg.h> 112# include <string.h> 113# include <stdio.h> 114 115# define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 116# include <sys/procfs.h> // see comment in <sys/procfs.h> 117 118#define MAX_PATH (2 * K) 119 120// for timer info max values which include all bits 121#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 122 123 124// Here are some liblgrp types from sys/lgrp_user.h to be able to 125// compile on older systems without this header file. 126 127#ifndef MADV_ACCESS_LWP 128 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */ 129#endif 130#ifndef MADV_ACCESS_MANY 131 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */ 132#endif 133 134#ifndef LGRP_RSRC_CPU 135 #define LGRP_RSRC_CPU 0 /* CPU resources */ 136#endif 137#ifndef LGRP_RSRC_MEM 138 #define LGRP_RSRC_MEM 1 /* memory resources */ 139#endif 140 141// Values for ThreadPriorityPolicy == 1 142int prio_policy1[CriticalPriority+1] = { 143 -99999, 0, 16, 32, 48, 64, 144 80, 96, 112, 124, 127, 127 }; 145 146// System parameters used internally 147static clock_t clock_tics_per_sec = 100; 148 149// Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+) 150static bool enabled_extended_FILE_stdio = false; 151 152// For diagnostics to print a message once. see run_periodic_checks 153static bool check_addr0_done = false; 154static sigset_t check_signal_done; 155static bool check_signals = true; 156 157address os::Solaris::handler_start; // start pc of thr_sighndlrinfo 158address os::Solaris::handler_end; // end pc of thr_sighndlrinfo 159 160address os::Solaris::_main_stack_base = NULL; // 4352906 workaround 161 162os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL; 163 164// "default" initializers for missing libc APIs 165extern "C" { 166 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 167 static int lwp_mutex_destroy(mutex_t *mx) { return 0; } 168 169 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 170 static int lwp_cond_destroy(cond_t *cv) { return 0; } 171} 172 173// "default" initializers for pthread-based synchronization 174extern "C" { 175 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 176 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 177} 178 179static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); 180 181static inline size_t adjust_stack_size(address base, size_t size) { 182 if ((ssize_t)size < 0) { 183 // 4759953: Compensate for ridiculous stack size. 184 size = max_intx; 185 } 186 if (size > (size_t)base) { 187 // 4812466: Make sure size doesn't allow the stack to wrap the address space. 188 size = (size_t)base; 189 } 190 return size; 191} 192 193static inline stack_t get_stack_info() { 194 stack_t st; 195 int retval = thr_stksegment(&st); 196 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); 197 assert(retval == 0, "incorrect return value from thr_stksegment"); 198 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 199 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 200 return st; 201} 202 203address os::current_stack_base() { 204 int r = thr_main(); 205 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 206 bool is_primordial_thread = r; 207 208 // Workaround 4352906, avoid calls to thr_stksegment by 209 // thr_main after the first one (it looks like we trash 210 // some data, causing the value for ss_sp to be incorrect). 211 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) { 212 stack_t st = get_stack_info(); 213 if (is_primordial_thread) { 214 // cache initial value of stack base 215 os::Solaris::_main_stack_base = (address)st.ss_sp; 216 } 217 return (address)st.ss_sp; 218 } else { 219 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); 220 return os::Solaris::_main_stack_base; 221 } 222} 223 224size_t os::current_stack_size() { 225 size_t size; 226 227 int r = thr_main(); 228 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 229 if (!r) { 230 size = get_stack_info().ss_size; 231 } else { 232 struct rlimit limits; 233 getrlimit(RLIMIT_STACK, &limits); 234 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); 235 } 236 // base may not be page aligned 237 address base = current_stack_base(); 238 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());; 239 return (size_t)(base - bottom); 240} 241 242struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 243 return localtime_r(clock, res); 244} 245 246void os::Solaris::try_enable_extended_io() { 247 typedef int (*enable_extended_FILE_stdio_t)(int, int); 248 249 if (!UseExtendedFileIO) { 250 return; 251 } 252 253 enable_extended_FILE_stdio_t enabler = 254 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT, 255 "enable_extended_FILE_stdio"); 256 if (enabler) { 257 enabler(-1, -1); 258 } 259} 260 261static int _processors_online = 0; 262 263jint os::Solaris::_os_thread_limit = 0; 264volatile jint os::Solaris::_os_thread_count = 0; 265 266julong os::available_memory() { 267 return Solaris::available_memory(); 268} 269 270julong os::Solaris::available_memory() { 271 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); 272} 273 274julong os::Solaris::_physical_memory = 0; 275 276julong os::physical_memory() { 277 return Solaris::physical_memory(); 278} 279 280static hrtime_t first_hrtime = 0; 281static const hrtime_t hrtime_hz = 1000*1000*1000; 282static volatile hrtime_t max_hrtime = 0; 283 284 285void os::Solaris::initialize_system_info() { 286 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); 287 _processors_online = sysconf(_SC_NPROCESSORS_ONLN); 288 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * 289 (julong)sysconf(_SC_PAGESIZE); 290} 291 292int os::active_processor_count() { 293 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 294 pid_t pid = getpid(); 295 psetid_t pset = PS_NONE; 296 // Are we running in a processor set or is there any processor set around? 297 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) { 298 uint_t pset_cpus; 299 // Query the number of cpus available to us. 300 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) { 301 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check"); 302 _processors_online = pset_cpus; 303 return pset_cpus; 304 } 305 } 306 // Otherwise return number of online cpus 307 return online_cpus; 308} 309 310static bool find_processors_in_pset(psetid_t pset, 311 processorid_t** id_array, 312 uint_t* id_length) { 313 bool result = false; 314 // Find the number of processors in the processor set. 315 if (pset_info(pset, NULL, id_length, NULL) == 0) { 316 // Make up an array to hold their ids. 317 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 318 // Fill in the array with their processor ids. 319 if (pset_info(pset, NULL, id_length, *id_array) == 0) { 320 result = true; 321 } 322 } 323 return result; 324} 325 326// Callers of find_processors_online() must tolerate imprecise results -- 327// the system configuration can change asynchronously because of DR 328// or explicit psradm operations. 329// 330// We also need to take care that the loop (below) terminates as the 331// number of processors online can change between the _SC_NPROCESSORS_ONLN 332// request and the loop that builds the list of processor ids. Unfortunately 333// there's no reliable way to determine the maximum valid processor id, 334// so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online 335// man pages, which claim the processor id set is "sparse, but 336// not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually 337// exit the loop. 338// 339// In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's 340// not available on S8.0. 341 342static bool find_processors_online(processorid_t** id_array, 343 uint* id_length) { 344 const processorid_t MAX_PROCESSOR_ID = 100000; 345 // Find the number of processors online. 346 *id_length = sysconf(_SC_NPROCESSORS_ONLN); 347 // Make up an array to hold their ids. 348 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 349 // Processors need not be numbered consecutively. 350 long found = 0; 351 processorid_t next = 0; 352 while (found < *id_length && next < MAX_PROCESSOR_ID) { 353 processor_info_t info; 354 if (processor_info(next, &info) == 0) { 355 // NB, PI_NOINTR processors are effectively online ... 356 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) { 357 (*id_array)[found] = next; 358 found += 1; 359 } 360 } 361 next += 1; 362 } 363 if (found < *id_length) { 364 // The loop above didn't identify the expected number of processors. 365 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN) 366 // and re-running the loop, above, but there's no guarantee of progress 367 // if the system configuration is in flux. Instead, we just return what 368 // we've got. Note that in the worst case find_processors_online() could 369 // return an empty set. (As a fall-back in the case of the empty set we 370 // could just return the ID of the current processor). 371 *id_length = found; 372 } 373 374 return true; 375} 376 377static bool assign_distribution(processorid_t* id_array, 378 uint id_length, 379 uint* distribution, 380 uint distribution_length) { 381 // We assume we can assign processorid_t's to uint's. 382 assert(sizeof(processorid_t) == sizeof(uint), 383 "can't convert processorid_t to uint"); 384 // Quick check to see if we won't succeed. 385 if (id_length < distribution_length) { 386 return false; 387 } 388 // Assign processor ids to the distribution. 389 // Try to shuffle processors to distribute work across boards, 390 // assuming 4 processors per board. 391 const uint processors_per_board = ProcessDistributionStride; 392 // Find the maximum processor id. 393 processorid_t max_id = 0; 394 for (uint m = 0; m < id_length; m += 1) { 395 max_id = MAX2(max_id, id_array[m]); 396 } 397 // The next id, to limit loops. 398 const processorid_t limit_id = max_id + 1; 399 // Make up markers for available processors. 400 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal); 401 for (uint c = 0; c < limit_id; c += 1) { 402 available_id[c] = false; 403 } 404 for (uint a = 0; a < id_length; a += 1) { 405 available_id[id_array[a]] = true; 406 } 407 // Step by "boards", then by "slot", copying to "assigned". 408 // NEEDS_CLEANUP: The assignment of processors should be stateful, 409 // remembering which processors have been assigned by 410 // previous calls, etc., so as to distribute several 411 // independent calls of this method. What we'd like is 412 // It would be nice to have an API that let us ask 413 // how many processes are bound to a processor, 414 // but we don't have that, either. 415 // In the short term, "board" is static so that 416 // subsequent distributions don't all start at board 0. 417 static uint board = 0; 418 uint assigned = 0; 419 // Until we've found enough processors .... 420 while (assigned < distribution_length) { 421 // ... find the next available processor in the board. 422 for (uint slot = 0; slot < processors_per_board; slot += 1) { 423 uint try_id = board * processors_per_board + slot; 424 if ((try_id < limit_id) && (available_id[try_id] == true)) { 425 distribution[assigned] = try_id; 426 available_id[try_id] = false; 427 assigned += 1; 428 break; 429 } 430 } 431 board += 1; 432 if (board * processors_per_board + 0 >= limit_id) { 433 board = 0; 434 } 435 } 436 if (available_id != NULL) { 437 FREE_C_HEAP_ARRAY(bool, available_id); 438 } 439 return true; 440} 441 442void os::set_native_thread_name(const char *name) { 443 if (Solaris::_pthread_setname_np != NULL) { 444 // Only the first 31 bytes of 'name' are processed by pthread_setname_np 445 // but we explicitly copy into a size-limited buffer to avoid any 446 // possible overflow. 447 char buf[32]; 448 snprintf(buf, sizeof(buf), "%s", name); 449 buf[sizeof(buf) - 1] = '\0'; 450 Solaris::_pthread_setname_np(pthread_self(), buf); 451 } 452} 453 454bool os::distribute_processes(uint length, uint* distribution) { 455 bool result = false; 456 // Find the processor id's of all the available CPUs. 457 processorid_t* id_array = NULL; 458 uint id_length = 0; 459 // There are some races between querying information and using it, 460 // since processor sets can change dynamically. 461 psetid_t pset = PS_NONE; 462 // Are we running in a processor set? 463 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) { 464 result = find_processors_in_pset(pset, &id_array, &id_length); 465 } else { 466 result = find_processors_online(&id_array, &id_length); 467 } 468 if (result == true) { 469 if (id_length >= length) { 470 result = assign_distribution(id_array, id_length, distribution, length); 471 } else { 472 result = false; 473 } 474 } 475 if (id_array != NULL) { 476 FREE_C_HEAP_ARRAY(processorid_t, id_array); 477 } 478 return result; 479} 480 481bool os::bind_to_processor(uint processor_id) { 482 // We assume that a processorid_t can be stored in a uint. 483 assert(sizeof(uint) == sizeof(processorid_t), 484 "can't convert uint to processorid_t"); 485 int bind_result = 486 processor_bind(P_LWPID, // bind LWP. 487 P_MYID, // bind current LWP. 488 (processorid_t) processor_id, // id. 489 NULL); // don't return old binding. 490 return (bind_result == 0); 491} 492 493// Return true if user is running as root. 494 495bool os::have_special_privileges() { 496 static bool init = false; 497 static bool privileges = false; 498 if (!init) { 499 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 500 init = true; 501 } 502 return privileges; 503} 504 505 506void os::init_system_properties_values() { 507 // The next steps are taken in the product version: 508 // 509 // Obtain the JAVA_HOME value from the location of libjvm.so. 510 // This library should be located at: 511 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 512 // 513 // If "/jre/lib/" appears at the right place in the path, then we 514 // assume libjvm.so is installed in a JDK and we use this path. 515 // 516 // Otherwise exit with message: "Could not create the Java virtual machine." 517 // 518 // The following extra steps are taken in the debugging version: 519 // 520 // If "/jre/lib/" does NOT appear at the right place in the path 521 // instead of exit check for $JAVA_HOME environment variable. 522 // 523 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 524 // then we append a fake suffix "hotspot/libjvm.so" to this path so 525 // it looks like libjvm.so is installed there 526 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 527 // 528 // Otherwise exit. 529 // 530 // Important note: if the location of libjvm.so changes this 531 // code needs to be changed accordingly. 532 533// Base path of extensions installed on the system. 534#define SYS_EXT_DIR "/usr/jdk/packages" 535#define EXTENSIONS_DIR "/lib/ext" 536 537 // Buffer that fits several sprintfs. 538 // Note that the space for the colon and the trailing null are provided 539 // by the nulls included by the sizeof operator. 540 const size_t bufsize = 541 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends. 542 sizeof(SYS_EXT_DIR) + sizeof("/lib/"), // invariant ld_library_path 543 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir 544 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 545 546 // sysclasspath, java_home, dll_dir 547 { 548 char *pslash; 549 os::jvm_path(buf, bufsize); 550 551 // Found the full path to libjvm.so. 552 // Now cut the path to <java_home>/jre if we can. 553 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 554 pslash = strrchr(buf, '/'); 555 if (pslash != NULL) { 556 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 557 } 558 Arguments::set_dll_dir(buf); 559 560 if (pslash != NULL) { 561 pslash = strrchr(buf, '/'); 562 if (pslash != NULL) { 563 *pslash = '\0'; // Get rid of /lib. 564 } 565 } 566 Arguments::set_java_home(buf); 567 set_boot_path('/', ':'); 568 } 569 570 // Where to look for native libraries. 571 { 572 // Use dlinfo() to determine the correct java.library.path. 573 // 574 // If we're launched by the Java launcher, and the user 575 // does not set java.library.path explicitly on the commandline, 576 // the Java launcher sets LD_LIBRARY_PATH for us and unsets 577 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case 578 // dlinfo returns LD_LIBRARY_PATH + crle settings (including 579 // /usr/lib), which is exactly what we want. 580 // 581 // If the user does set java.library.path, it completely 582 // overwrites this setting, and always has. 583 // 584 // If we're not launched by the Java launcher, we may 585 // get here with any/all of the LD_LIBRARY_PATH[_32|64] 586 // settings. Again, dlinfo does exactly what we want. 587 588 Dl_serinfo info_sz, *info = &info_sz; 589 Dl_serpath *path; 590 char *library_path; 591 char *common_path = buf; 592 593 // Determine search path count and required buffer size. 594 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) { 595 FREE_C_HEAP_ARRAY(char, buf); 596 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror()); 597 } 598 599 // Allocate new buffer and initialize. 600 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal); 601 info->dls_size = info_sz.dls_size; 602 info->dls_cnt = info_sz.dls_cnt; 603 604 // Obtain search path information. 605 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) { 606 FREE_C_HEAP_ARRAY(char, buf); 607 FREE_C_HEAP_ARRAY(char, info); 608 vm_exit_during_initialization("dlinfo SERINFO request", dlerror()); 609 } 610 611 path = &info->dls_serpath[0]; 612 613 // Note: Due to a legacy implementation, most of the library path 614 // is set in the launcher. This was to accomodate linking restrictions 615 // on legacy Solaris implementations (which are no longer supported). 616 // Eventually, all the library path setting will be done here. 617 // 618 // However, to prevent the proliferation of improperly built native 619 // libraries, the new path component /usr/jdk/packages is added here. 620 621 // Construct the invariant part of ld_library_path. 622 sprintf(common_path, SYS_EXT_DIR "/lib"); 623 624 // Struct size is more than sufficient for the path components obtained 625 // through the dlinfo() call, so only add additional space for the path 626 // components explicitly added here. 627 size_t library_path_size = info->dls_size + strlen(common_path); 628 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal); 629 library_path[0] = '\0'; 630 631 // Construct the desired Java library path from the linker's library 632 // search path. 633 // 634 // For compatibility, it is optimal that we insert the additional path 635 // components specific to the Java VM after those components specified 636 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so 637 // infrastructure. 638 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it. 639 strcpy(library_path, common_path); 640 } else { 641 int inserted = 0; 642 int i; 643 for (i = 0; i < info->dls_cnt; i++, path++) { 644 uint_t flags = path->dls_flags & LA_SER_MASK; 645 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) { 646 strcat(library_path, common_path); 647 strcat(library_path, os::path_separator()); 648 inserted = 1; 649 } 650 strcat(library_path, path->dls_name); 651 strcat(library_path, os::path_separator()); 652 } 653 // Eliminate trailing path separator. 654 library_path[strlen(library_path)-1] = '\0'; 655 } 656 657 // happens before argument parsing - can't use a trace flag 658 // tty->print_raw("init_system_properties_values: native lib path: "); 659 // tty->print_raw_cr(library_path); 660 661 // Callee copies into its own buffer. 662 Arguments::set_library_path(library_path); 663 664 FREE_C_HEAP_ARRAY(char, library_path); 665 FREE_C_HEAP_ARRAY(char, info); 666 } 667 668 // Extensions directories. 669 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); 670 Arguments::set_ext_dirs(buf); 671 672 FREE_C_HEAP_ARRAY(char, buf); 673 674#undef SYS_EXT_DIR 675#undef EXTENSIONS_DIR 676} 677 678void os::breakpoint() { 679 BREAKPOINT; 680} 681 682bool os::obsolete_option(const JavaVMOption *option) { 683 if (!strncmp(option->optionString, "-Xt", 3)) { 684 return true; 685 } else if (!strncmp(option->optionString, "-Xtm", 4)) { 686 return true; 687 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) { 688 return true; 689 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) { 690 return true; 691 } 692 return false; 693} 694 695bool os::Solaris::valid_stack_address(Thread* thread, address sp) { 696 address stackStart = (address)thread->stack_base(); 697 address stackEnd = (address)(stackStart - (address)thread->stack_size()); 698 if (sp < stackStart && sp >= stackEnd) return true; 699 return false; 700} 701 702extern "C" void breakpoint() { 703 // use debugger to set breakpoint here 704} 705 706static thread_t main_thread; 707 708// Thread start routine for all newly created threads 709extern "C" void* thread_native_entry(void* thread_addr) { 710 // Try to randomize the cache line index of hot stack frames. 711 // This helps when threads of the same stack traces evict each other's 712 // cache lines. The threads can be either from the same JVM instance, or 713 // from different JVM instances. The benefit is especially true for 714 // processors with hyperthreading technology. 715 static int counter = 0; 716 int pid = os::current_process_id(); 717 alloca(((pid ^ counter++) & 7) * 128); 718 719 int prio; 720 Thread* thread = (Thread*)thread_addr; 721 722 thread->initialize_thread_current(); 723 724 OSThread* osthr = thread->osthread(); 725 726 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound 727 thread->_schedctl = (void *) schedctl_init(); 728 729 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", 730 os::current_thread_id()); 731 732 if (UseNUMA) { 733 int lgrp_id = os::numa_get_group_id(); 734 if (lgrp_id != -1) { 735 thread->set_lgrp_id(lgrp_id); 736 } 737 } 738 739 // Our priority was set when we were created, and stored in the 740 // osthread, but couldn't be passed through to our LWP until now. 741 // So read back the priority and set it again. 742 743 if (osthr->thread_id() != -1) { 744 if (UseThreadPriorities) { 745 int prio = osthr->native_priority(); 746 if (ThreadPriorityVerbose) { 747 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " 748 INTPTR_FORMAT ", setting priority: %d\n", 749 osthr->thread_id(), osthr->lwp_id(), prio); 750 } 751 os::set_native_priority(thread, prio); 752 } 753 } else if (ThreadPriorityVerbose) { 754 warning("Can't set priority in _start routine, thread id hasn't been set\n"); 755 } 756 757 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 758 759 // initialize signal mask for this thread 760 os::Solaris::hotspot_sigmask(thread); 761 762 thread->run(); 763 764 // One less thread is executing 765 // When the VMThread gets here, the main thread may have already exited 766 // which frees the CodeHeap containing the Atomic::dec code 767 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 768 Atomic::dec(&os::Solaris::_os_thread_count); 769 } 770 771 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id()); 772 773 // If a thread has not deleted itself ("delete this") as part of its 774 // termination sequence, we have to ensure thread-local-storage is 775 // cleared before we actually terminate. No threads should ever be 776 // deleted asynchronously with respect to their termination. 777 if (Thread::current_or_null_safe() != NULL) { 778 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 779 thread->clear_thread_current(); 780 } 781 782 if (UseDetachedThreads) { 783 thr_exit(NULL); 784 ShouldNotReachHere(); 785 } 786 return NULL; 787} 788 789static OSThread* create_os_thread(Thread* thread, thread_t thread_id) { 790 // Allocate the OSThread object 791 OSThread* osthread = new OSThread(NULL, NULL); 792 if (osthread == NULL) return NULL; 793 794 // Store info on the Solaris thread into the OSThread 795 osthread->set_thread_id(thread_id); 796 osthread->set_lwp_id(_lwp_self()); 797 thread->_schedctl = (void *) schedctl_init(); 798 799 if (UseNUMA) { 800 int lgrp_id = os::numa_get_group_id(); 801 if (lgrp_id != -1) { 802 thread->set_lgrp_id(lgrp_id); 803 } 804 } 805 806 if (ThreadPriorityVerbose) { 807 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n", 808 osthread->thread_id(), osthread->lwp_id()); 809 } 810 811 // Initial thread state is INITIALIZED, not SUSPENDED 812 osthread->set_state(INITIALIZED); 813 814 return osthread; 815} 816 817void os::Solaris::hotspot_sigmask(Thread* thread) { 818 //Save caller's signal mask 819 sigset_t sigmask; 820 pthread_sigmask(SIG_SETMASK, NULL, &sigmask); 821 OSThread *osthread = thread->osthread(); 822 osthread->set_caller_sigmask(sigmask); 823 824 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL); 825 if (!ReduceSignalUsage) { 826 if (thread->is_VM_thread()) { 827 // Only the VM thread handles BREAK_SIGNAL ... 828 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 829 } else { 830 // ... all other threads block BREAK_SIGNAL 831 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked"); 832 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 833 } 834 } 835} 836 837bool os::create_attached_thread(JavaThread* thread) { 838#ifdef ASSERT 839 thread->verify_not_published(); 840#endif 841 OSThread* osthread = create_os_thread(thread, thr_self()); 842 if (osthread == NULL) { 843 return false; 844 } 845 846 // Initial thread state is RUNNABLE 847 osthread->set_state(RUNNABLE); 848 thread->set_osthread(osthread); 849 850 // initialize signal mask for this thread 851 // and save the caller's signal mask 852 os::Solaris::hotspot_sigmask(thread); 853 854 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").", 855 os::current_thread_id()); 856 857 return true; 858} 859 860bool os::create_main_thread(JavaThread* thread) { 861#ifdef ASSERT 862 thread->verify_not_published(); 863#endif 864 if (_starting_thread == NULL) { 865 _starting_thread = create_os_thread(thread, main_thread); 866 if (_starting_thread == NULL) { 867 return false; 868 } 869 } 870 871 // The primodial thread is runnable from the start 872 _starting_thread->set_state(RUNNABLE); 873 874 thread->set_osthread(_starting_thread); 875 876 // initialize signal mask for this thread 877 // and save the caller's signal mask 878 os::Solaris::hotspot_sigmask(thread); 879 880 return true; 881} 882 883// Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr() 884static char* describe_thr_create_attributes(char* buf, size_t buflen, 885 size_t stacksize, long flags) { 886 stringStream ss(buf, buflen); 887 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024); 888 ss.print("flags: "); 889 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " "); 890 #define ALL(X) \ 891 X(THR_SUSPENDED) \ 892 X(THR_DETACHED) \ 893 X(THR_BOUND) \ 894 X(THR_NEW_LWP) \ 895 X(THR_DAEMON) 896 ALL(PRINT_FLAG) 897 #undef ALL 898 #undef PRINT_FLAG 899 return buf; 900} 901 902// return default stack size for thr_type 903size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 904 // default stack size when not specified by caller is 1M (2M for LP64) 905 size_t s = (BytesPerWord >> 2) * K * K; 906 return s; 907} 908 909bool os::create_thread(Thread* thread, ThreadType thr_type, 910 size_t req_stack_size) { 911 // Allocate the OSThread object 912 OSThread* osthread = new OSThread(NULL, NULL); 913 if (osthread == NULL) { 914 return false; 915 } 916 917 if (ThreadPriorityVerbose) { 918 char *thrtyp; 919 switch (thr_type) { 920 case vm_thread: 921 thrtyp = (char *)"vm"; 922 break; 923 case cgc_thread: 924 thrtyp = (char *)"cgc"; 925 break; 926 case pgc_thread: 927 thrtyp = (char *)"pgc"; 928 break; 929 case java_thread: 930 thrtyp = (char *)"java"; 931 break; 932 case compiler_thread: 933 thrtyp = (char *)"compiler"; 934 break; 935 case watcher_thread: 936 thrtyp = (char *)"watcher"; 937 break; 938 default: 939 thrtyp = (char *)"unknown"; 940 break; 941 } 942 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp); 943 } 944 945 // calculate stack size if it's not specified by caller 946 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 947 948 // Initial state is ALLOCATED but not INITIALIZED 949 osthread->set_state(ALLOCATED); 950 951 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) { 952 // We got lots of threads. Check if we still have some address space left. 953 // Need to be at least 5Mb of unreserved address space. We do check by 954 // trying to reserve some. 955 const size_t VirtualMemoryBangSize = 20*K*K; 956 char* mem = os::reserve_memory(VirtualMemoryBangSize); 957 if (mem == NULL) { 958 delete osthread; 959 return false; 960 } else { 961 // Release the memory again 962 os::release_memory(mem, VirtualMemoryBangSize); 963 } 964 } 965 966 // Setup osthread because the child thread may need it. 967 thread->set_osthread(osthread); 968 969 // Create the Solaris thread 970 thread_t tid = 0; 971 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED; 972 int status; 973 974 // Mark that we don't have an lwp or thread id yet. 975 // In case we attempt to set the priority before the thread starts. 976 osthread->set_lwp_id(-1); 977 osthread->set_thread_id(-1); 978 979 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid); 980 981 char buf[64]; 982 if (status == 0) { 983 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ", 984 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 985 } else { 986 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.", 987 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 988 } 989 990 if (status != 0) { 991 thread->set_osthread(NULL); 992 // Need to clean up stuff we've allocated so far 993 delete osthread; 994 return false; 995 } 996 997 Atomic::inc(&os::Solaris::_os_thread_count); 998 999 // Store info on the Solaris thread into the OSThread 1000 osthread->set_thread_id(tid); 1001 1002 // Remember that we created this thread so we can set priority on it 1003 osthread->set_vm_created(); 1004 1005 // Most thread types will set an explicit priority before starting the thread, 1006 // but for those that don't we need a valid value to read back in thread_native_entry. 1007 osthread->set_native_priority(NormPriority); 1008 1009 // Initial thread state is INITIALIZED, not SUSPENDED 1010 osthread->set_state(INITIALIZED); 1011 1012 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 1013 return true; 1014} 1015 1016// defined for >= Solaris 10. This allows builds on earlier versions 1017// of Solaris to take advantage of the newly reserved Solaris JVM signals. 1018// With SIGJVM1, SIGJVM2, ASYNC_SIGNAL is SIGJVM2. Previously INTERRUPT_SIGNAL 1019// was SIGJVM1. 1020// 1021#if !defined(SIGJVM1) 1022 #define SIGJVM1 39 1023 #define SIGJVM2 40 1024#endif 1025 1026debug_only(static bool signal_sets_initialized = false); 1027static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 1028 1029int os::Solaris::_SIGasync = ASYNC_SIGNAL; 1030 1031bool os::Solaris::is_sig_ignored(int sig) { 1032 struct sigaction oact; 1033 sigaction(sig, (struct sigaction*)NULL, &oact); 1034 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 1035 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 1036 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) { 1037 return true; 1038 } else { 1039 return false; 1040 } 1041} 1042 1043// Note: SIGRTMIN is a macro that calls sysconf() so it will 1044// dynamically detect SIGRTMIN value for the system at runtime, not buildtime 1045static bool isJVM1available() { 1046 return SIGJVM1 < SIGRTMIN; 1047} 1048 1049void os::Solaris::signal_sets_init() { 1050 // Should also have an assertion stating we are still single-threaded. 1051 assert(!signal_sets_initialized, "Already initialized"); 1052 // Fill in signals that are necessarily unblocked for all threads in 1053 // the VM. Currently, we unblock the following signals: 1054 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 1055 // by -Xrs (=ReduceSignalUsage)); 1056 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 1057 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 1058 // the dispositions or masks wrt these signals. 1059 // Programs embedding the VM that want to use the above signals for their 1060 // own purposes must, at this time, use the "-Xrs" option to prevent 1061 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 1062 // (See bug 4345157, and other related bugs). 1063 // In reality, though, unblocking these signals is really a nop, since 1064 // these signals are not blocked by default. 1065 sigemptyset(&unblocked_sigs); 1066 sigemptyset(&allowdebug_blocked_sigs); 1067 sigaddset(&unblocked_sigs, SIGILL); 1068 sigaddset(&unblocked_sigs, SIGSEGV); 1069 sigaddset(&unblocked_sigs, SIGBUS); 1070 sigaddset(&unblocked_sigs, SIGFPE); 1071 1072 // Always true on Solaris 10+ 1073 guarantee(isJVM1available(), "SIGJVM1/2 missing!"); 1074 os::Solaris::set_SIGasync(SIGJVM2); 1075 1076 sigaddset(&unblocked_sigs, os::Solaris::SIGasync()); 1077 1078 if (!ReduceSignalUsage) { 1079 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 1080 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 1081 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 1082 } 1083 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 1084 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 1085 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 1086 } 1087 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 1088 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 1089 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 1090 } 1091 } 1092 // Fill in signals that are blocked by all but the VM thread. 1093 sigemptyset(&vm_sigs); 1094 if (!ReduceSignalUsage) { 1095 sigaddset(&vm_sigs, BREAK_SIGNAL); 1096 } 1097 debug_only(signal_sets_initialized = true); 1098 1099 // For diagnostics only used in run_periodic_checks 1100 sigemptyset(&check_signal_done); 1101} 1102 1103// These are signals that are unblocked while a thread is running Java. 1104// (For some reason, they get blocked by default.) 1105sigset_t* os::Solaris::unblocked_signals() { 1106 assert(signal_sets_initialized, "Not initialized"); 1107 return &unblocked_sigs; 1108} 1109 1110// These are the signals that are blocked while a (non-VM) thread is 1111// running Java. Only the VM thread handles these signals. 1112sigset_t* os::Solaris::vm_signals() { 1113 assert(signal_sets_initialized, "Not initialized"); 1114 return &vm_sigs; 1115} 1116 1117// These are signals that are blocked during cond_wait to allow debugger in 1118sigset_t* os::Solaris::allowdebug_blocked_signals() { 1119 assert(signal_sets_initialized, "Not initialized"); 1120 return &allowdebug_blocked_sigs; 1121} 1122 1123 1124void _handle_uncaught_cxx_exception() { 1125 VMError::report_and_die("An uncaught C++ exception"); 1126} 1127 1128 1129// First crack at OS-specific initialization, from inside the new thread. 1130void os::initialize_thread(Thread* thr) { 1131 int r = thr_main(); 1132 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 1133 if (r) { 1134 JavaThread* jt = (JavaThread *)thr; 1135 assert(jt != NULL, "Sanity check"); 1136 size_t stack_size; 1137 address base = jt->stack_base(); 1138 if (Arguments::created_by_java_launcher()) { 1139 // Use 2MB to allow for Solaris 7 64 bit mode. 1140 stack_size = JavaThread::stack_size_at_create() == 0 1141 ? 2048*K : JavaThread::stack_size_at_create(); 1142 1143 // There are rare cases when we may have already used more than 1144 // the basic stack size allotment before this method is invoked. 1145 // Attempt to allow for a normally sized java_stack. 1146 size_t current_stack_offset = (size_t)(base - (address)&stack_size); 1147 stack_size += ReservedSpace::page_align_size_down(current_stack_offset); 1148 } else { 1149 // 6269555: If we were not created by a Java launcher, i.e. if we are 1150 // running embedded in a native application, treat the primordial thread 1151 // as much like a native attached thread as possible. This means using 1152 // the current stack size from thr_stksegment(), unless it is too large 1153 // to reliably setup guard pages. A reasonable max size is 8MB. 1154 size_t current_size = current_stack_size(); 1155 // This should never happen, but just in case.... 1156 if (current_size == 0) current_size = 2 * K * K; 1157 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size; 1158 } 1159 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());; 1160 stack_size = (size_t)(base - bottom); 1161 1162 assert(stack_size > 0, "Stack size calculation problem"); 1163 1164 if (stack_size > jt->stack_size()) { 1165#ifndef PRODUCT 1166 struct rlimit limits; 1167 getrlimit(RLIMIT_STACK, &limits); 1168 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur); 1169 assert(size >= jt->stack_size(), "Stack size problem in main thread"); 1170#endif 1171 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n" 1172 "(Stack sizes are rounded up to a multiple of the system page size.)\n" 1173 "See limit(1) to increase the stack size limit.", 1174 stack_size / K, jt->stack_size() / K); 1175 vm_exit(1); 1176 } 1177 assert(jt->stack_size() >= stack_size, 1178 "Attempt to map more stack than was allocated"); 1179 jt->set_stack_size(stack_size); 1180 } 1181 1182 // With the T2 libthread (T1 is no longer supported) threads are always bound 1183 // and we use stackbanging in all cases. 1184 1185 os::Solaris::init_thread_fpu_state(); 1186 std::set_terminate(_handle_uncaught_cxx_exception); 1187} 1188 1189 1190 1191// Free Solaris resources related to the OSThread 1192void os::free_thread(OSThread* osthread) { 1193 assert(osthread != NULL, "os::free_thread but osthread not set"); 1194 1195 // We are told to free resources of the argument thread, 1196 // but we can only really operate on the current thread. 1197 assert(Thread::current()->osthread() == osthread, 1198 "os::free_thread but not current thread"); 1199 1200 // Restore caller's signal mask 1201 sigset_t sigmask = osthread->caller_sigmask(); 1202 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 1203 1204 delete osthread; 1205} 1206 1207void os::pd_start_thread(Thread* thread) { 1208 int status = thr_continue(thread->osthread()->thread_id()); 1209 assert_status(status == 0, status, "thr_continue failed"); 1210} 1211 1212 1213intx os::current_thread_id() { 1214 return (intx)thr_self(); 1215} 1216 1217static pid_t _initial_pid = 0; 1218 1219int os::current_process_id() { 1220 return (int)(_initial_pid ? _initial_pid : getpid()); 1221} 1222 1223// gethrtime() should be monotonic according to the documentation, 1224// but some virtualized platforms are known to break this guarantee. 1225// getTimeNanos() must be guaranteed not to move backwards, so we 1226// are forced to add a check here. 1227inline hrtime_t getTimeNanos() { 1228 const hrtime_t now = gethrtime(); 1229 const hrtime_t prev = max_hrtime; 1230 if (now <= prev) { 1231 return prev; // same or retrograde time; 1232 } 1233 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev); 1234 assert(obsv >= prev, "invariant"); // Monotonicity 1235 // If the CAS succeeded then we're done and return "now". 1236 // If the CAS failed and the observed value "obsv" is >= now then 1237 // we should return "obsv". If the CAS failed and now > obsv > prv then 1238 // some other thread raced this thread and installed a new value, in which case 1239 // we could either (a) retry the entire operation, (b) retry trying to install now 1240 // or (c) just return obsv. We use (c). No loop is required although in some cases 1241 // we might discard a higher "now" value in deference to a slightly lower but freshly 1242 // installed obsv value. That's entirely benign -- it admits no new orderings compared 1243 // to (a) or (b) -- and greatly reduces coherence traffic. 1244 // We might also condition (c) on the magnitude of the delta between obsv and now. 1245 // Avoiding excessive CAS operations to hot RW locations is critical. 1246 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 1247 return (prev == obsv) ? now : obsv; 1248} 1249 1250// Time since start-up in seconds to a fine granularity. 1251// Used by VMSelfDestructTimer and the MemProfiler. 1252double os::elapsedTime() { 1253 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1254} 1255 1256jlong os::elapsed_counter() { 1257 return (jlong)(getTimeNanos() - first_hrtime); 1258} 1259 1260jlong os::elapsed_frequency() { 1261 return hrtime_hz; 1262} 1263 1264// Return the real, user, and system times in seconds from an 1265// arbitrary fixed point in the past. 1266bool os::getTimesSecs(double* process_real_time, 1267 double* process_user_time, 1268 double* process_system_time) { 1269 struct tms ticks; 1270 clock_t real_ticks = times(&ticks); 1271 1272 if (real_ticks == (clock_t) (-1)) { 1273 return false; 1274 } else { 1275 double ticks_per_second = (double) clock_tics_per_sec; 1276 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1277 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1278 // For consistency return the real time from getTimeNanos() 1279 // converted to seconds. 1280 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); 1281 1282 return true; 1283 } 1284} 1285 1286bool os::supports_vtime() { return true; } 1287bool os::enable_vtime() { return false; } 1288bool os::vtime_enabled() { return false; } 1289 1290double os::elapsedVTime() { 1291 return (double)gethrvtime() / (double)hrtime_hz; 1292} 1293 1294// Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 1295jlong os::javaTimeMillis() { 1296 timeval t; 1297 if (gettimeofday(&t, NULL) == -1) { 1298 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno)); 1299 } 1300 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; 1301} 1302 1303// Must return seconds+nanos since Jan 1 1970. This must use the same 1304// time source as javaTimeMillis and can't use get_nsec_fromepoch as 1305// we need better than 1ms accuracy 1306void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 1307 timeval t; 1308 if (gettimeofday(&t, NULL) == -1) { 1309 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno)); 1310 } 1311 seconds = jlong(t.tv_sec); 1312 nanos = jlong(t.tv_usec) * 1000; 1313} 1314 1315 1316jlong os::javaTimeNanos() { 1317 return (jlong)getTimeNanos(); 1318} 1319 1320void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1321 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits 1322 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1323 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1324 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1325} 1326 1327char * os::local_time_string(char *buf, size_t buflen) { 1328 struct tm t; 1329 time_t long_time; 1330 time(&long_time); 1331 localtime_r(&long_time, &t); 1332 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1333 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1334 t.tm_hour, t.tm_min, t.tm_sec); 1335 return buf; 1336} 1337 1338// Note: os::shutdown() might be called very early during initialization, or 1339// called from signal handler. Before adding something to os::shutdown(), make 1340// sure it is async-safe and can handle partially initialized VM. 1341void os::shutdown() { 1342 1343 // allow PerfMemory to attempt cleanup of any persistent resources 1344 perfMemory_exit(); 1345 1346 // needs to remove object in file system 1347 AttachListener::abort(); 1348 1349 // flush buffered output, finish log files 1350 ostream_abort(); 1351 1352 // Check for abort hook 1353 abort_hook_t abort_hook = Arguments::abort_hook(); 1354 if (abort_hook != NULL) { 1355 abort_hook(); 1356 } 1357} 1358 1359// Note: os::abort() might be called very early during initialization, or 1360// called from signal handler. Before adding something to os::abort(), make 1361// sure it is async-safe and can handle partially initialized VM. 1362void os::abort(bool dump_core, void* siginfo, const void* context) { 1363 os::shutdown(); 1364 if (dump_core) { 1365#ifndef PRODUCT 1366 fdStream out(defaultStream::output_fd()); 1367 out.print_raw("Current thread is "); 1368 char buf[16]; 1369 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1370 out.print_raw_cr(buf); 1371 out.print_raw_cr("Dumping core ..."); 1372#endif 1373 ::abort(); // dump core (for debugging) 1374 } 1375 1376 ::exit(1); 1377} 1378 1379// Die immediately, no exit hook, no abort hook, no cleanup. 1380void os::die() { 1381 ::abort(); // dump core (for debugging) 1382} 1383 1384// DLL functions 1385 1386const char* os::dll_file_extension() { return ".so"; } 1387 1388// This must be hard coded because it's the system's temporary 1389// directory not the java application's temp directory, ala java.io.tmpdir. 1390const char* os::get_temp_directory() { return "/tmp"; } 1391 1392static bool file_exists(const char* filename) { 1393 struct stat statbuf; 1394 if (filename == NULL || strlen(filename) == 0) { 1395 return false; 1396 } 1397 return os::stat(filename, &statbuf) == 0; 1398} 1399 1400bool os::dll_build_name(char* buffer, size_t buflen, 1401 const char* pname, const char* fname) { 1402 bool retval = false; 1403 const size_t pnamelen = pname ? strlen(pname) : 0; 1404 1405 // Return error on buffer overflow. 1406 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { 1407 return retval; 1408 } 1409 1410 if (pnamelen == 0) { 1411 snprintf(buffer, buflen, "lib%s.so", fname); 1412 retval = true; 1413 } else if (strchr(pname, *os::path_separator()) != NULL) { 1414 int n; 1415 char** pelements = split_path(pname, &n); 1416 if (pelements == NULL) { 1417 return false; 1418 } 1419 for (int i = 0; i < n; i++) { 1420 // really shouldn't be NULL but what the heck, check can't hurt 1421 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1422 continue; // skip the empty path values 1423 } 1424 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); 1425 if (file_exists(buffer)) { 1426 retval = true; 1427 break; 1428 } 1429 } 1430 // release the storage 1431 for (int i = 0; i < n; i++) { 1432 if (pelements[i] != NULL) { 1433 FREE_C_HEAP_ARRAY(char, pelements[i]); 1434 } 1435 } 1436 if (pelements != NULL) { 1437 FREE_C_HEAP_ARRAY(char*, pelements); 1438 } 1439 } else { 1440 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); 1441 retval = true; 1442 } 1443 return retval; 1444} 1445 1446// check if addr is inside libjvm.so 1447bool os::address_is_in_vm(address addr) { 1448 static address libjvm_base_addr; 1449 Dl_info dlinfo; 1450 1451 if (libjvm_base_addr == NULL) { 1452 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1453 libjvm_base_addr = (address)dlinfo.dli_fbase; 1454 } 1455 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1456 } 1457 1458 if (dladdr((void *)addr, &dlinfo) != 0) { 1459 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1460 } 1461 1462 return false; 1463} 1464 1465typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int); 1466static dladdr1_func_type dladdr1_func = NULL; 1467 1468bool os::dll_address_to_function_name(address addr, char *buf, 1469 int buflen, int * offset, 1470 bool demangle) { 1471 // buf is not optional, but offset is optional 1472 assert(buf != NULL, "sanity check"); 1473 1474 Dl_info dlinfo; 1475 1476 // dladdr1_func was initialized in os::init() 1477 if (dladdr1_func != NULL) { 1478 // yes, we have dladdr1 1479 1480 // Support for dladdr1 is checked at runtime; it may be 1481 // available even if the vm is built on a machine that does 1482 // not have dladdr1 support. Make sure there is a value for 1483 // RTLD_DL_SYMENT. 1484#ifndef RTLD_DL_SYMENT 1485 #define RTLD_DL_SYMENT 1 1486#endif 1487#ifdef _LP64 1488 Elf64_Sym * info; 1489#else 1490 Elf32_Sym * info; 1491#endif 1492 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1493 RTLD_DL_SYMENT) != 0) { 1494 // see if we have a matching symbol that covers our address 1495 if (dlinfo.dli_saddr != NULL && 1496 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) { 1497 if (dlinfo.dli_sname != NULL) { 1498 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1499 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1500 } 1501 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1502 return true; 1503 } 1504 } 1505 // no matching symbol so try for just file info 1506 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1507 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1508 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1509 return true; 1510 } 1511 } 1512 } 1513 buf[0] = '\0'; 1514 if (offset != NULL) *offset = -1; 1515 return false; 1516 } 1517 1518 // no, only dladdr is available 1519 if (dladdr((void *)addr, &dlinfo) != 0) { 1520 // see if we have a matching symbol 1521 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1522 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1523 jio_snprintf(buf, buflen, dlinfo.dli_sname); 1524 } 1525 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1526 return true; 1527 } 1528 // no matching symbol so try for just file info 1529 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1530 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1531 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1532 return true; 1533 } 1534 } 1535 } 1536 buf[0] = '\0'; 1537 if (offset != NULL) *offset = -1; 1538 return false; 1539} 1540 1541bool os::dll_address_to_library_name(address addr, char* buf, 1542 int buflen, int* offset) { 1543 // buf is not optional, but offset is optional 1544 assert(buf != NULL, "sanity check"); 1545 1546 Dl_info dlinfo; 1547 1548 if (dladdr((void*)addr, &dlinfo) != 0) { 1549 if (dlinfo.dli_fname != NULL) { 1550 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1551 } 1552 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1553 *offset = addr - (address)dlinfo.dli_fbase; 1554 } 1555 return true; 1556 } 1557 1558 buf[0] = '\0'; 1559 if (offset) *offset = -1; 1560 return false; 1561} 1562 1563int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1564 Dl_info dli; 1565 // Sanity check? 1566 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 || 1567 dli.dli_fname == NULL) { 1568 return 1; 1569 } 1570 1571 void * handle = dlopen(dli.dli_fname, RTLD_LAZY); 1572 if (handle == NULL) { 1573 return 1; 1574 } 1575 1576 Link_map *map; 1577 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1578 if (map == NULL) { 1579 dlclose(handle); 1580 return 1; 1581 } 1582 1583 while (map->l_prev != NULL) { 1584 map = map->l_prev; 1585 } 1586 1587 while (map != NULL) { 1588 // Iterate through all map entries and call callback with fields of interest 1589 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1590 dlclose(handle); 1591 return 1; 1592 } 1593 map = map->l_next; 1594 } 1595 1596 dlclose(handle); 1597 return 0; 1598} 1599 1600int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1601 outputStream * out = (outputStream *) param; 1602 out->print_cr(PTR_FORMAT " \t%s", base_address, name); 1603 return 0; 1604} 1605 1606void os::print_dll_info(outputStream * st) { 1607 st->print_cr("Dynamic libraries:"); st->flush(); 1608 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1609 st->print_cr("Error: Cannot print dynamic libraries."); 1610 } 1611} 1612 1613// Loads .dll/.so and 1614// in case of error it checks if .dll/.so was built for the 1615// same architecture as Hotspot is running on 1616 1617void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1618 void * result= ::dlopen(filename, RTLD_LAZY); 1619 if (result != NULL) { 1620 // Successful loading 1621 return result; 1622 } 1623 1624 Elf32_Ehdr elf_head; 1625 1626 // Read system error message into ebuf 1627 // It may or may not be overwritten below 1628 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1629 ebuf[ebuflen-1]='\0'; 1630 int diag_msg_max_length=ebuflen-strlen(ebuf); 1631 char* diag_msg_buf=ebuf+strlen(ebuf); 1632 1633 if (diag_msg_max_length==0) { 1634 // No more space in ebuf for additional diagnostics message 1635 return NULL; 1636 } 1637 1638 1639 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1640 1641 if (file_descriptor < 0) { 1642 // Can't open library, report dlerror() message 1643 return NULL; 1644 } 1645 1646 bool failed_to_read_elf_head= 1647 (sizeof(elf_head)!= 1648 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1649 1650 ::close(file_descriptor); 1651 if (failed_to_read_elf_head) { 1652 // file i/o error - report dlerror() msg 1653 return NULL; 1654 } 1655 1656 typedef struct { 1657 Elf32_Half code; // Actual value as defined in elf.h 1658 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1659 char elf_class; // 32 or 64 bit 1660 char endianess; // MSB or LSB 1661 char* name; // String representation 1662 } arch_t; 1663 1664 static const arch_t arch_array[]={ 1665 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1666 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1667 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1668 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1669 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1670 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1671 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1672 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1673 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1674 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"} 1675 }; 1676 1677#if (defined IA32) 1678 static Elf32_Half running_arch_code=EM_386; 1679#elif (defined AMD64) 1680 static Elf32_Half running_arch_code=EM_X86_64; 1681#elif (defined IA64) 1682 static Elf32_Half running_arch_code=EM_IA_64; 1683#elif (defined __sparc) && (defined _LP64) 1684 static Elf32_Half running_arch_code=EM_SPARCV9; 1685#elif (defined __sparc) && (!defined _LP64) 1686 static Elf32_Half running_arch_code=EM_SPARC; 1687#elif (defined __powerpc64__) 1688 static Elf32_Half running_arch_code=EM_PPC64; 1689#elif (defined __powerpc__) 1690 static Elf32_Half running_arch_code=EM_PPC; 1691#elif (defined ARM) 1692 static Elf32_Half running_arch_code=EM_ARM; 1693#else 1694 #error Method os::dll_load requires that one of following is defined:\ 1695 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM 1696#endif 1697 1698 // Identify compatability class for VM's architecture and library's architecture 1699 // Obtain string descriptions for architectures 1700 1701 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1702 int running_arch_index=-1; 1703 1704 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1705 if (running_arch_code == arch_array[i].code) { 1706 running_arch_index = i; 1707 } 1708 if (lib_arch.code == arch_array[i].code) { 1709 lib_arch.compat_class = arch_array[i].compat_class; 1710 lib_arch.name = arch_array[i].name; 1711 } 1712 } 1713 1714 assert(running_arch_index != -1, 1715 "Didn't find running architecture code (running_arch_code) in arch_array"); 1716 if (running_arch_index == -1) { 1717 // Even though running architecture detection failed 1718 // we may still continue with reporting dlerror() message 1719 return NULL; 1720 } 1721 1722 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1723 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1724 return NULL; 1725 } 1726 1727 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1728 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1729 return NULL; 1730 } 1731 1732 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1733 if (lib_arch.name!=NULL) { 1734 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1735 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1736 lib_arch.name, arch_array[running_arch_index].name); 1737 } else { 1738 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1739 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1740 lib_arch.code, 1741 arch_array[running_arch_index].name); 1742 } 1743 } 1744 1745 return NULL; 1746} 1747 1748void* os::dll_lookup(void* handle, const char* name) { 1749 return dlsym(handle, name); 1750} 1751 1752void* os::get_default_process_handle() { 1753 return (void*)::dlopen(NULL, RTLD_LAZY); 1754} 1755 1756int os::stat(const char *path, struct stat *sbuf) { 1757 char pathbuf[MAX_PATH]; 1758 if (strlen(path) > MAX_PATH - 1) { 1759 errno = ENAMETOOLONG; 1760 return -1; 1761 } 1762 os::native_path(strcpy(pathbuf, path)); 1763 return ::stat(pathbuf, sbuf); 1764} 1765 1766static inline time_t get_mtime(const char* filename) { 1767 struct stat st; 1768 int ret = os::stat(filename, &st); 1769 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 1770 return st.st_mtime; 1771} 1772 1773int os::compare_file_modified_times(const char* file1, const char* file2) { 1774 time_t t1 = get_mtime(file1); 1775 time_t t2 = get_mtime(file2); 1776 return t1 - t2; 1777} 1778 1779static bool _print_ascii_file(const char* filename, outputStream* st) { 1780 int fd = ::open(filename, O_RDONLY); 1781 if (fd == -1) { 1782 return false; 1783 } 1784 1785 char buf[32]; 1786 int bytes; 1787 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1788 st->print_raw(buf, bytes); 1789 } 1790 1791 ::close(fd); 1792 1793 return true; 1794} 1795 1796void os::print_os_info_brief(outputStream* st) { 1797 os::Solaris::print_distro_info(st); 1798 1799 os::Posix::print_uname_info(st); 1800 1801 os::Solaris::print_libversion_info(st); 1802} 1803 1804void os::print_os_info(outputStream* st) { 1805 st->print("OS:"); 1806 1807 os::Solaris::print_distro_info(st); 1808 1809 os::Posix::print_uname_info(st); 1810 1811 os::Solaris::print_libversion_info(st); 1812 1813 os::Posix::print_rlimit_info(st); 1814 1815 os::Posix::print_load_average(st); 1816} 1817 1818void os::Solaris::print_distro_info(outputStream* st) { 1819 if (!_print_ascii_file("/etc/release", st)) { 1820 st->print("Solaris"); 1821 } 1822 st->cr(); 1823} 1824 1825void os::get_summary_os_info(char* buf, size_t buflen) { 1826 strncpy(buf, "Solaris", buflen); // default to plain solaris 1827 FILE* fp = fopen("/etc/release", "r"); 1828 if (fp != NULL) { 1829 char tmp[256]; 1830 // Only get the first line and chop out everything but the os name. 1831 if (fgets(tmp, sizeof(tmp), fp)) { 1832 char* ptr = tmp; 1833 // skip past whitespace characters 1834 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++; 1835 if (*ptr != '\0') { 1836 char* nl = strchr(ptr, '\n'); 1837 if (nl != NULL) *nl = '\0'; 1838 strncpy(buf, ptr, buflen); 1839 } 1840 } 1841 fclose(fp); 1842 } 1843} 1844 1845void os::Solaris::print_libversion_info(outputStream* st) { 1846 st->print(" (T2 libthread)"); 1847 st->cr(); 1848} 1849 1850static bool check_addr0(outputStream* st) { 1851 jboolean status = false; 1852 const int read_chunk = 200; 1853 int ret = 0; 1854 int nmap = 0; 1855 int fd = ::open("/proc/self/map",O_RDONLY); 1856 if (fd >= 0) { 1857 prmap_t *p = NULL; 1858 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t)); 1859 if (NULL == mbuff) { 1860 ::close(fd); 1861 return status; 1862 } 1863 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) { 1864 //check if read() has not read partial data 1865 if( 0 != ret % sizeof(prmap_t)){ 1866 break; 1867 } 1868 nmap = ret / sizeof(prmap_t); 1869 p = (prmap_t *)mbuff; 1870 for(int i = 0; i < nmap; i++){ 1871 if (p->pr_vaddr == 0x0) { 1872 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024); 1873 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname); 1874 st->print("Access: "); 1875 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-"); 1876 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-"); 1877 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-"); 1878 st->cr(); 1879 status = true; 1880 } 1881 p++; 1882 } 1883 } 1884 free(mbuff); 1885 ::close(fd); 1886 } 1887 return status; 1888} 1889 1890void os::get_summary_cpu_info(char* buf, size_t buflen) { 1891 // Get MHz with system call. We don't seem to already have this. 1892 processor_info_t stats; 1893 processorid_t id = getcpuid(); 1894 int clock = 0; 1895 if (processor_info(id, &stats) != -1) { 1896 clock = stats.pi_clock; // pi_processor_type isn't more informative than below 1897 } 1898#ifdef AMD64 1899 snprintf(buf, buflen, "x86 64 bit %d MHz", clock); 1900#else 1901 // must be sparc 1902 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock); 1903#endif 1904} 1905 1906void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1907 // Nothing to do for now. 1908} 1909 1910void os::print_memory_info(outputStream* st) { 1911 st->print("Memory:"); 1912 st->print(" %dk page", os::vm_page_size()>>10); 1913 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 1914 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 1915 st->cr(); 1916 (void) check_addr0(st); 1917} 1918 1919// Moved from whole group, because we need them here for diagnostic 1920// prints. 1921#define OLDMAXSIGNUM 32 1922static int Maxsignum = 0; 1923static int *ourSigFlags = NULL; 1924 1925int os::Solaris::get_our_sigflags(int sig) { 1926 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1927 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1928 return ourSigFlags[sig]; 1929} 1930 1931void os::Solaris::set_our_sigflags(int sig, int flags) { 1932 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1933 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1934 ourSigFlags[sig] = flags; 1935} 1936 1937 1938static const char* get_signal_handler_name(address handler, 1939 char* buf, int buflen) { 1940 int offset; 1941 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 1942 if (found) { 1943 // skip directory names 1944 const char *p1, *p2; 1945 p1 = buf; 1946 size_t len = strlen(os::file_separator()); 1947 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 1948 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 1949 } else { 1950 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 1951 } 1952 return buf; 1953} 1954 1955static void print_signal_handler(outputStream* st, int sig, 1956 char* buf, size_t buflen) { 1957 struct sigaction sa; 1958 1959 sigaction(sig, NULL, &sa); 1960 1961 st->print("%s: ", os::exception_name(sig, buf, buflen)); 1962 1963 address handler = (sa.sa_flags & SA_SIGINFO) 1964 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 1965 : CAST_FROM_FN_PTR(address, sa.sa_handler); 1966 1967 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 1968 st->print("SIG_DFL"); 1969 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 1970 st->print("SIG_IGN"); 1971 } else { 1972 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 1973 } 1974 1975 st->print(", sa_mask[0]="); 1976 os::Posix::print_signal_set_short(st, &sa.sa_mask); 1977 1978 address rh = VMError::get_resetted_sighandler(sig); 1979 // May be, handler was resetted by VMError? 1980 if (rh != NULL) { 1981 handler = rh; 1982 sa.sa_flags = VMError::get_resetted_sigflags(sig); 1983 } 1984 1985 st->print(", sa_flags="); 1986 os::Posix::print_sa_flags(st, sa.sa_flags); 1987 1988 // Check: is it our handler? 1989 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) { 1990 // It is our signal handler 1991 // check for flags 1992 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 1993 st->print( 1994 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 1995 os::Solaris::get_our_sigflags(sig)); 1996 } 1997 } 1998 st->cr(); 1999} 2000 2001void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 2002 st->print_cr("Signal Handlers:"); 2003 print_signal_handler(st, SIGSEGV, buf, buflen); 2004 print_signal_handler(st, SIGBUS , buf, buflen); 2005 print_signal_handler(st, SIGFPE , buf, buflen); 2006 print_signal_handler(st, SIGPIPE, buf, buflen); 2007 print_signal_handler(st, SIGXFSZ, buf, buflen); 2008 print_signal_handler(st, SIGILL , buf, buflen); 2009 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 2010 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 2011 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 2012 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 2013 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 2014 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen); 2015} 2016 2017static char saved_jvm_path[MAXPATHLEN] = { 0 }; 2018 2019// Find the full path to the current module, libjvm.so 2020void os::jvm_path(char *buf, jint buflen) { 2021 // Error checking. 2022 if (buflen < MAXPATHLEN) { 2023 assert(false, "must use a large-enough buffer"); 2024 buf[0] = '\0'; 2025 return; 2026 } 2027 // Lazy resolve the path to current module. 2028 if (saved_jvm_path[0] != 0) { 2029 strcpy(buf, saved_jvm_path); 2030 return; 2031 } 2032 2033 Dl_info dlinfo; 2034 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 2035 assert(ret != 0, "cannot locate libjvm"); 2036 if (ret != 0 && dlinfo.dli_fname != NULL) { 2037 realpath((char *)dlinfo.dli_fname, buf); 2038 } else { 2039 buf[0] = '\0'; 2040 return; 2041 } 2042 2043 if (Arguments::sun_java_launcher_is_altjvm()) { 2044 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 2045 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". 2046 // If "/jre/lib/" appears at the right place in the string, then 2047 // assume we are installed in a JDK and we're done. Otherwise, check 2048 // for a JAVA_HOME environment variable and fix up the path so it 2049 // looks like libjvm.so is installed there (append a fake suffix 2050 // hotspot/libjvm.so). 2051 const char *p = buf + strlen(buf) - 1; 2052 for (int count = 0; p > buf && count < 5; ++count) { 2053 for (--p; p > buf && *p != '/'; --p) 2054 /* empty */ ; 2055 } 2056 2057 if (strncmp(p, "/jre/lib/", 9) != 0) { 2058 // Look for JAVA_HOME in the environment. 2059 char* java_home_var = ::getenv("JAVA_HOME"); 2060 if (java_home_var != NULL && java_home_var[0] != 0) { 2061 char* jrelib_p; 2062 int len; 2063 2064 // Check the current module name "libjvm.so". 2065 p = strrchr(buf, '/'); 2066 assert(strstr(p, "/libjvm") == p, "invalid library name"); 2067 2068 realpath(java_home_var, buf); 2069 // determine if this is a legacy image or modules image 2070 // modules image doesn't have "jre" subdirectory 2071 len = strlen(buf); 2072 assert(len < buflen, "Ran out of buffer space"); 2073 jrelib_p = buf + len; 2074 snprintf(jrelib_p, buflen-len, "/jre/lib"); 2075 if (0 != access(buf, F_OK)) { 2076 snprintf(jrelib_p, buflen-len, "/lib"); 2077 } 2078 2079 if (0 == access(buf, F_OK)) { 2080 // Use current module name "libjvm.so" 2081 len = strlen(buf); 2082 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 2083 } else { 2084 // Go back to path of .so 2085 realpath((char *)dlinfo.dli_fname, buf); 2086 } 2087 } 2088 } 2089 } 2090 2091 strncpy(saved_jvm_path, buf, MAXPATHLEN); 2092 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 2093} 2094 2095 2096void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2097 // no prefix required, not even "_" 2098} 2099 2100 2101void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2102 // no suffix required 2103} 2104 2105// This method is a copy of JDK's sysGetLastErrorString 2106// from src/solaris/hpi/src/system_md.c 2107 2108size_t os::lasterror(char *buf, size_t len) { 2109 if (errno == 0) return 0; 2110 2111 const char *s = os::strerror(errno); 2112 size_t n = ::strlen(s); 2113 if (n >= len) { 2114 n = len - 1; 2115 } 2116 ::strncpy(buf, s, n); 2117 buf[n] = '\0'; 2118 return n; 2119} 2120 2121 2122// sun.misc.Signal 2123 2124extern "C" { 2125 static void UserHandler(int sig, void *siginfo, void *context) { 2126 // Ctrl-C is pressed during error reporting, likely because the error 2127 // handler fails to abort. Let VM die immediately. 2128 if (sig == SIGINT && is_error_reported()) { 2129 os::die(); 2130 } 2131 2132 os::signal_notify(sig); 2133 // We do not need to reinstate the signal handler each time... 2134 } 2135} 2136 2137void* os::user_handler() { 2138 return CAST_FROM_FN_PTR(void*, UserHandler); 2139} 2140 2141struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) { 2142 struct timespec ts; 2143 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 2144 2145 return ts; 2146} 2147 2148extern "C" { 2149 typedef void (*sa_handler_t)(int); 2150 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2151} 2152 2153void* os::signal(int signal_number, void* handler) { 2154 struct sigaction sigAct, oldSigAct; 2155 sigfillset(&(sigAct.sa_mask)); 2156 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 2157 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2158 2159 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 2160 // -1 means registration failed 2161 return (void *)-1; 2162 } 2163 2164 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2165} 2166 2167void os::signal_raise(int signal_number) { 2168 raise(signal_number); 2169} 2170 2171// The following code is moved from os.cpp for making this 2172// code platform specific, which it is by its very nature. 2173 2174// a counter for each possible signal value 2175static int Sigexit = 0; 2176static int Maxlibjsigsigs; 2177static jint *pending_signals = NULL; 2178static int *preinstalled_sigs = NULL; 2179static struct sigaction *chainedsigactions = NULL; 2180static sema_t sig_sem; 2181typedef int (*version_getting_t)(); 2182version_getting_t os::Solaris::get_libjsig_version = NULL; 2183static int libjsigversion = NULL; 2184 2185int os::sigexitnum_pd() { 2186 assert(Sigexit > 0, "signal memory not yet initialized"); 2187 return Sigexit; 2188} 2189 2190void os::Solaris::init_signal_mem() { 2191 // Initialize signal structures 2192 Maxsignum = SIGRTMAX; 2193 Sigexit = Maxsignum+1; 2194 assert(Maxsignum >0, "Unable to obtain max signal number"); 2195 2196 Maxlibjsigsigs = Maxsignum; 2197 2198 // pending_signals has one int per signal 2199 // The additional signal is for SIGEXIT - exit signal to signal_thread 2200 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); 2201 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 2202 2203 if (UseSignalChaining) { 2204 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 2205 * (Maxsignum + 1), mtInternal); 2206 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 2207 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2208 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 2209 } 2210 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2211 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 2212} 2213 2214void os::signal_init_pd() { 2215 int ret; 2216 2217 ret = ::sema_init(&sig_sem, 0, NULL, NULL); 2218 assert(ret == 0, "sema_init() failed"); 2219} 2220 2221void os::signal_notify(int signal_number) { 2222 int ret; 2223 2224 Atomic::inc(&pending_signals[signal_number]); 2225 ret = ::sema_post(&sig_sem); 2226 assert(ret == 0, "sema_post() failed"); 2227} 2228 2229static int check_pending_signals(bool wait_for_signal) { 2230 int ret; 2231 while (true) { 2232 for (int i = 0; i < Sigexit + 1; i++) { 2233 jint n = pending_signals[i]; 2234 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2235 return i; 2236 } 2237 } 2238 if (!wait_for_signal) { 2239 return -1; 2240 } 2241 JavaThread *thread = JavaThread::current(); 2242 ThreadBlockInVM tbivm(thread); 2243 2244 bool threadIsSuspended; 2245 do { 2246 thread->set_suspend_equivalent(); 2247 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2248 while ((ret = ::sema_wait(&sig_sem)) == EINTR) 2249 ; 2250 assert(ret == 0, "sema_wait() failed"); 2251 2252 // were we externally suspended while we were waiting? 2253 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2254 if (threadIsSuspended) { 2255 // The semaphore has been incremented, but while we were waiting 2256 // another thread suspended us. We don't want to continue running 2257 // while suspended because that would surprise the thread that 2258 // suspended us. 2259 ret = ::sema_post(&sig_sem); 2260 assert(ret == 0, "sema_post() failed"); 2261 2262 thread->java_suspend_self(); 2263 } 2264 } while (threadIsSuspended); 2265 } 2266} 2267 2268int os::signal_lookup() { 2269 return check_pending_signals(false); 2270} 2271 2272int os::signal_wait() { 2273 return check_pending_signals(true); 2274} 2275 2276//////////////////////////////////////////////////////////////////////////////// 2277// Virtual Memory 2278 2279static int page_size = -1; 2280 2281// The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will 2282// clear this var if support is not available. 2283static bool has_map_align = true; 2284 2285int os::vm_page_size() { 2286 assert(page_size != -1, "must call os::init"); 2287 return page_size; 2288} 2289 2290// Solaris allocates memory by pages. 2291int os::vm_allocation_granularity() { 2292 assert(page_size != -1, "must call os::init"); 2293 return page_size; 2294} 2295 2296static bool recoverable_mmap_error(int err) { 2297 // See if the error is one we can let the caller handle. This 2298 // list of errno values comes from the Solaris mmap(2) man page. 2299 switch (err) { 2300 case EBADF: 2301 case EINVAL: 2302 case ENOTSUP: 2303 // let the caller deal with these errors 2304 return true; 2305 2306 default: 2307 // Any remaining errors on this OS can cause our reserved mapping 2308 // to be lost. That can cause confusion where different data 2309 // structures think they have the same memory mapped. The worst 2310 // scenario is if both the VM and a library think they have the 2311 // same memory mapped. 2312 return false; 2313 } 2314} 2315 2316static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec, 2317 int err) { 2318 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2319 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec, 2320 os::strerror(err), err); 2321} 2322 2323static void warn_fail_commit_memory(char* addr, size_t bytes, 2324 size_t alignment_hint, bool exec, 2325 int err) { 2326 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2327 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes, 2328 alignment_hint, exec, os::strerror(err), err); 2329} 2330 2331int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) { 2332 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2333 size_t size = bytes; 2334 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2335 if (res != NULL) { 2336 if (UseNUMAInterleaving) { 2337 numa_make_global(addr, bytes); 2338 } 2339 return 0; 2340 } 2341 2342 int err = errno; // save errno from mmap() call in mmap_chunk() 2343 2344 if (!recoverable_mmap_error(err)) { 2345 warn_fail_commit_memory(addr, bytes, exec, err); 2346 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory."); 2347 } 2348 2349 return err; 2350} 2351 2352bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 2353 return Solaris::commit_memory_impl(addr, bytes, exec) == 0; 2354} 2355 2356void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec, 2357 const char* mesg) { 2358 assert(mesg != NULL, "mesg must be specified"); 2359 int err = os::Solaris::commit_memory_impl(addr, bytes, exec); 2360 if (err != 0) { 2361 // the caller wants all commit errors to exit with the specified mesg: 2362 warn_fail_commit_memory(addr, bytes, exec, err); 2363 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2364 } 2365} 2366 2367size_t os::Solaris::page_size_for_alignment(size_t alignment) { 2368 assert(is_size_aligned(alignment, (size_t) vm_page_size()), 2369 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, 2370 alignment, (size_t) vm_page_size()); 2371 2372 for (int i = 0; _page_sizes[i] != 0; i++) { 2373 if (is_size_aligned(alignment, _page_sizes[i])) { 2374 return _page_sizes[i]; 2375 } 2376 } 2377 2378 return (size_t) vm_page_size(); 2379} 2380 2381int os::Solaris::commit_memory_impl(char* addr, size_t bytes, 2382 size_t alignment_hint, bool exec) { 2383 int err = Solaris::commit_memory_impl(addr, bytes, exec); 2384 if (err == 0 && UseLargePages && alignment_hint > 0) { 2385 assert(is_size_aligned(bytes, alignment_hint), 2386 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint); 2387 2388 // The syscall memcntl requires an exact page size (see man memcntl for details). 2389 size_t page_size = page_size_for_alignment(alignment_hint); 2390 if (page_size > (size_t) vm_page_size()) { 2391 (void)Solaris::setup_large_pages(addr, bytes, page_size); 2392 } 2393 } 2394 return err; 2395} 2396 2397bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2398 bool exec) { 2399 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0; 2400} 2401 2402void os::pd_commit_memory_or_exit(char* addr, size_t bytes, 2403 size_t alignment_hint, bool exec, 2404 const char* mesg) { 2405 assert(mesg != NULL, "mesg must be specified"); 2406 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec); 2407 if (err != 0) { 2408 // the caller wants all commit errors to exit with the specified mesg: 2409 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err); 2410 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2411 } 2412} 2413 2414// Uncommit the pages in a specified region. 2415void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { 2416 if (madvise(addr, bytes, MADV_FREE) < 0) { 2417 debug_only(warning("MADV_FREE failed.")); 2418 return; 2419 } 2420} 2421 2422bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2423 return os::commit_memory(addr, size, !ExecMem); 2424} 2425 2426bool os::remove_stack_guard_pages(char* addr, size_t size) { 2427 return os::uncommit_memory(addr, size); 2428} 2429 2430// Change the page size in a given range. 2431void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2432 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2433 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2434 if (UseLargePages) { 2435 size_t page_size = Solaris::page_size_for_alignment(alignment_hint); 2436 if (page_size > (size_t) vm_page_size()) { 2437 Solaris::setup_large_pages(addr, bytes, page_size); 2438 } 2439 } 2440} 2441 2442// Tell the OS to make the range local to the first-touching LWP 2443void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2444 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2445 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2446 debug_only(warning("MADV_ACCESS_LWP failed.")); 2447 } 2448} 2449 2450// Tell the OS that this range would be accessed from different LWPs. 2451void os::numa_make_global(char *addr, size_t bytes) { 2452 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2453 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2454 debug_only(warning("MADV_ACCESS_MANY failed.")); 2455 } 2456} 2457 2458// Get the number of the locality groups. 2459size_t os::numa_get_groups_num() { 2460 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2461 return n != -1 ? n : 1; 2462} 2463 2464// Get a list of leaf locality groups. A leaf lgroup is group that 2465// doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2466// board. An LWP is assigned to one of these groups upon creation. 2467size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2468 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2469 ids[0] = 0; 2470 return 1; 2471 } 2472 int result_size = 0, top = 1, bottom = 0, cur = 0; 2473 for (int k = 0; k < size; k++) { 2474 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2475 (Solaris::lgrp_id_t*)&ids[top], size - top); 2476 if (r == -1) { 2477 ids[0] = 0; 2478 return 1; 2479 } 2480 if (!r) { 2481 // That's a leaf node. 2482 assert(bottom <= cur, "Sanity check"); 2483 // Check if the node has memory 2484 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2485 NULL, 0, LGRP_RSRC_MEM) > 0) { 2486 ids[bottom++] = ids[cur]; 2487 } 2488 } 2489 top += r; 2490 cur++; 2491 } 2492 if (bottom == 0) { 2493 // Handle a situation, when the OS reports no memory available. 2494 // Assume UMA architecture. 2495 ids[0] = 0; 2496 return 1; 2497 } 2498 return bottom; 2499} 2500 2501// Detect the topology change. Typically happens during CPU plugging-unplugging. 2502bool os::numa_topology_changed() { 2503 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2504 if (is_stale != -1 && is_stale) { 2505 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2506 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2507 assert(c != 0, "Failure to initialize LGRP API"); 2508 Solaris::set_lgrp_cookie(c); 2509 return true; 2510 } 2511 return false; 2512} 2513 2514// Get the group id of the current LWP. 2515int os::numa_get_group_id() { 2516 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2517 if (lgrp_id == -1) { 2518 return 0; 2519 } 2520 const int size = os::numa_get_groups_num(); 2521 int *ids = (int*)alloca(size * sizeof(int)); 2522 2523 // Get the ids of all lgroups with memory; r is the count. 2524 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2525 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2526 if (r <= 0) { 2527 return 0; 2528 } 2529 return ids[os::random() % r]; 2530} 2531 2532// Request information about the page. 2533bool os::get_page_info(char *start, page_info* info) { 2534 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2535 uint64_t addr = (uintptr_t)start; 2536 uint64_t outdata[2]; 2537 uint_t validity = 0; 2538 2539 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2540 return false; 2541 } 2542 2543 info->size = 0; 2544 info->lgrp_id = -1; 2545 2546 if ((validity & 1) != 0) { 2547 if ((validity & 2) != 0) { 2548 info->lgrp_id = outdata[0]; 2549 } 2550 if ((validity & 4) != 0) { 2551 info->size = outdata[1]; 2552 } 2553 return true; 2554 } 2555 return false; 2556} 2557 2558// Scan the pages from start to end until a page different than 2559// the one described in the info parameter is encountered. 2560char *os::scan_pages(char *start, char* end, page_info* page_expected, 2561 page_info* page_found) { 2562 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2563 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2564 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1]; 2565 uint_t validity[MAX_MEMINFO_CNT]; 2566 2567 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2568 uint64_t p = (uint64_t)start; 2569 while (p < (uint64_t)end) { 2570 addrs[0] = p; 2571 size_t addrs_count = 1; 2572 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { 2573 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2574 addrs_count++; 2575 } 2576 2577 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2578 return NULL; 2579 } 2580 2581 size_t i = 0; 2582 for (; i < addrs_count; i++) { 2583 if ((validity[i] & 1) != 0) { 2584 if ((validity[i] & 4) != 0) { 2585 if (outdata[types * i + 1] != page_expected->size) { 2586 break; 2587 } 2588 } else if (page_expected->size != 0) { 2589 break; 2590 } 2591 2592 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2593 if (outdata[types * i] != page_expected->lgrp_id) { 2594 break; 2595 } 2596 } 2597 } else { 2598 return NULL; 2599 } 2600 } 2601 2602 if (i < addrs_count) { 2603 if ((validity[i] & 2) != 0) { 2604 page_found->lgrp_id = outdata[types * i]; 2605 } else { 2606 page_found->lgrp_id = -1; 2607 } 2608 if ((validity[i] & 4) != 0) { 2609 page_found->size = outdata[types * i + 1]; 2610 } else { 2611 page_found->size = 0; 2612 } 2613 return (char*)addrs[i]; 2614 } 2615 2616 p = addrs[addrs_count - 1] + page_size; 2617 } 2618 return end; 2619} 2620 2621bool os::pd_uncommit_memory(char* addr, size_t bytes) { 2622 size_t size = bytes; 2623 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2624 // uncommitted page. Otherwise, the read/write might succeed if we 2625 // have enough swap space to back the physical page. 2626 return 2627 NULL != Solaris::mmap_chunk(addr, size, 2628 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2629 PROT_NONE); 2630} 2631 2632char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2633 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2634 2635 if (b == MAP_FAILED) { 2636 return NULL; 2637 } 2638 return b; 2639} 2640 2641char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, 2642 size_t alignment_hint, bool fixed) { 2643 char* addr = requested_addr; 2644 int flags = MAP_PRIVATE | MAP_NORESERVE; 2645 2646 assert(!(fixed && (alignment_hint > 0)), 2647 "alignment hint meaningless with fixed mmap"); 2648 2649 if (fixed) { 2650 flags |= MAP_FIXED; 2651 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) { 2652 flags |= MAP_ALIGN; 2653 addr = (char*) alignment_hint; 2654 } 2655 2656 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2657 // uncommitted page. Otherwise, the read/write might succeed if we 2658 // have enough swap space to back the physical page. 2659 return mmap_chunk(addr, bytes, flags, PROT_NONE); 2660} 2661 2662char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2663 size_t alignment_hint) { 2664 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, 2665 (requested_addr != NULL)); 2666 2667 guarantee(requested_addr == NULL || requested_addr == addr, 2668 "OS failed to return requested mmap address."); 2669 return addr; 2670} 2671 2672// Reserve memory at an arbitrary address, only if that area is 2673// available (and not reserved for something else). 2674 2675char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2676 const int max_tries = 10; 2677 char* base[max_tries]; 2678 size_t size[max_tries]; 2679 2680 // Solaris adds a gap between mmap'ed regions. The size of the gap 2681 // is dependent on the requested size and the MMU. Our initial gap 2682 // value here is just a guess and will be corrected later. 2683 bool had_top_overlap = false; 2684 bool have_adjusted_gap = false; 2685 size_t gap = 0x400000; 2686 2687 // Assert only that the size is a multiple of the page size, since 2688 // that's all that mmap requires, and since that's all we really know 2689 // about at this low abstraction level. If we need higher alignment, 2690 // we can either pass an alignment to this method or verify alignment 2691 // in one of the methods further up the call chain. See bug 5044738. 2692 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2693 2694 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 2695 // Give it a try, if the kernel honors the hint we can return immediately. 2696 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 2697 2698 volatile int err = errno; 2699 if (addr == requested_addr) { 2700 return addr; 2701 } else if (addr != NULL) { 2702 pd_unmap_memory(addr, bytes); 2703 } 2704 2705 if (log_is_enabled(Warning, os)) { 2706 char buf[256]; 2707 buf[0] = '\0'; 2708 if (addr == NULL) { 2709 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err)); 2710 } 2711 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at " 2712 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT 2713 "%s", bytes, requested_addr, addr, buf); 2714 } 2715 2716 // Address hint method didn't work. Fall back to the old method. 2717 // In theory, once SNV becomes our oldest supported platform, this 2718 // code will no longer be needed. 2719 // 2720 // Repeatedly allocate blocks until the block is allocated at the 2721 // right spot. Give up after max_tries. 2722 int i; 2723 for (i = 0; i < max_tries; ++i) { 2724 base[i] = reserve_memory(bytes); 2725 2726 if (base[i] != NULL) { 2727 // Is this the block we wanted? 2728 if (base[i] == requested_addr) { 2729 size[i] = bytes; 2730 break; 2731 } 2732 2733 // check that the gap value is right 2734 if (had_top_overlap && !have_adjusted_gap) { 2735 size_t actual_gap = base[i-1] - base[i] - bytes; 2736 if (gap != actual_gap) { 2737 // adjust the gap value and retry the last 2 allocations 2738 assert(i > 0, "gap adjustment code problem"); 2739 have_adjusted_gap = true; // adjust the gap only once, just in case 2740 gap = actual_gap; 2741 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap); 2742 unmap_memory(base[i], bytes); 2743 unmap_memory(base[i-1], size[i-1]); 2744 i-=2; 2745 continue; 2746 } 2747 } 2748 2749 // Does this overlap the block we wanted? Give back the overlapped 2750 // parts and try again. 2751 // 2752 // There is still a bug in this code: if top_overlap == bytes, 2753 // the overlap is offset from requested region by the value of gap. 2754 // In this case giving back the overlapped part will not work, 2755 // because we'll give back the entire block at base[i] and 2756 // therefore the subsequent allocation will not generate a new gap. 2757 // This could be fixed with a new algorithm that used larger 2758 // or variable size chunks to find the requested region - 2759 // but such a change would introduce additional complications. 2760 // It's rare enough that the planets align for this bug, 2761 // so we'll just wait for a fix for 6204603/5003415 which 2762 // will provide a mmap flag to allow us to avoid this business. 2763 2764 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2765 if (top_overlap >= 0 && top_overlap < bytes) { 2766 had_top_overlap = true; 2767 unmap_memory(base[i], top_overlap); 2768 base[i] += top_overlap; 2769 size[i] = bytes - top_overlap; 2770 } else { 2771 size_t bottom_overlap = base[i] + bytes - requested_addr; 2772 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2773 if (bottom_overlap == 0) { 2774 log_info(os)("attempt_reserve_memory_at: possible alignment bug"); 2775 } 2776 unmap_memory(requested_addr, bottom_overlap); 2777 size[i] = bytes - bottom_overlap; 2778 } else { 2779 size[i] = bytes; 2780 } 2781 } 2782 } 2783 } 2784 2785 // Give back the unused reserved pieces. 2786 2787 for (int j = 0; j < i; ++j) { 2788 if (base[j] != NULL) { 2789 unmap_memory(base[j], size[j]); 2790 } 2791 } 2792 2793 return (i < max_tries) ? requested_addr : NULL; 2794} 2795 2796bool os::pd_release_memory(char* addr, size_t bytes) { 2797 size_t size = bytes; 2798 return munmap(addr, size) == 0; 2799} 2800 2801static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 2802 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()), 2803 "addr must be page aligned"); 2804 int retVal = mprotect(addr, bytes, prot); 2805 return retVal == 0; 2806} 2807 2808// Protect memory (Used to pass readonly pages through 2809// JNI GetArray<type>Elements with empty arrays.) 2810// Also, used for serialization page and for compressed oops null pointer 2811// checking. 2812bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2813 bool is_committed) { 2814 unsigned int p = 0; 2815 switch (prot) { 2816 case MEM_PROT_NONE: p = PROT_NONE; break; 2817 case MEM_PROT_READ: p = PROT_READ; break; 2818 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2819 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2820 default: 2821 ShouldNotReachHere(); 2822 } 2823 // is_committed is unused. 2824 return solaris_mprotect(addr, bytes, p); 2825} 2826 2827// guard_memory and unguard_memory only happens within stack guard pages. 2828// Since ISM pertains only to the heap, guard and unguard memory should not 2829/// happen with an ISM region. 2830bool os::guard_memory(char* addr, size_t bytes) { 2831 return solaris_mprotect(addr, bytes, PROT_NONE); 2832} 2833 2834bool os::unguard_memory(char* addr, size_t bytes) { 2835 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 2836} 2837 2838// Large page support 2839static size_t _large_page_size = 0; 2840 2841// Insertion sort for small arrays (descending order). 2842static void insertion_sort_descending(size_t* array, int len) { 2843 for (int i = 0; i < len; i++) { 2844 size_t val = array[i]; 2845 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 2846 size_t tmp = array[key]; 2847 array[key] = array[key - 1]; 2848 array[key - 1] = tmp; 2849 } 2850 } 2851} 2852 2853bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) { 2854 const unsigned int usable_count = VM_Version::page_size_count(); 2855 if (usable_count == 1) { 2856 return false; 2857 } 2858 2859 // Find the right getpagesizes interface. When solaris 11 is the minimum 2860 // build platform, getpagesizes() (without the '2') can be called directly. 2861 typedef int (*gps_t)(size_t[], int); 2862 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); 2863 if (gps_func == NULL) { 2864 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); 2865 if (gps_func == NULL) { 2866 if (warn) { 2867 warning("MPSS is not supported by the operating system."); 2868 } 2869 return false; 2870 } 2871 } 2872 2873 // Fill the array of page sizes. 2874 int n = (*gps_func)(_page_sizes, page_sizes_max); 2875 assert(n > 0, "Solaris bug?"); 2876 2877 if (n == page_sizes_max) { 2878 // Add a sentinel value (necessary only if the array was completely filled 2879 // since it is static (zeroed at initialization)). 2880 _page_sizes[--n] = 0; 2881 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 2882 } 2883 assert(_page_sizes[n] == 0, "missing sentinel"); 2884 trace_page_sizes("available page sizes", _page_sizes, n); 2885 2886 if (n == 1) return false; // Only one page size available. 2887 2888 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 2889 // select up to usable_count elements. First sort the array, find the first 2890 // acceptable value, then copy the usable sizes to the top of the array and 2891 // trim the rest. Make sure to include the default page size :-). 2892 // 2893 // A better policy could get rid of the 4M limit by taking the sizes of the 2894 // important VM memory regions (java heap and possibly the code cache) into 2895 // account. 2896 insertion_sort_descending(_page_sizes, n); 2897 const size_t size_limit = 2898 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 2899 int beg; 2900 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */; 2901 const int end = MIN2((int)usable_count, n) - 1; 2902 for (int cur = 0; cur < end; ++cur, ++beg) { 2903 _page_sizes[cur] = _page_sizes[beg]; 2904 } 2905 _page_sizes[end] = vm_page_size(); 2906 _page_sizes[end + 1] = 0; 2907 2908 if (_page_sizes[end] > _page_sizes[end - 1]) { 2909 // Default page size is not the smallest; sort again. 2910 insertion_sort_descending(_page_sizes, end + 1); 2911 } 2912 *page_size = _page_sizes[0]; 2913 2914 trace_page_sizes("usable page sizes", _page_sizes, end + 1); 2915 return true; 2916} 2917 2918void os::large_page_init() { 2919 if (UseLargePages) { 2920 // print a warning if any large page related flag is specified on command line 2921 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2922 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2923 2924 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 2925 } 2926} 2927 2928bool os::Solaris::is_valid_page_size(size_t bytes) { 2929 for (int i = 0; _page_sizes[i] != 0; i++) { 2930 if (_page_sizes[i] == bytes) { 2931 return true; 2932 } 2933 } 2934 return false; 2935} 2936 2937bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) { 2938 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align); 2939 assert(is_ptr_aligned((void*) start, align), 2940 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align); 2941 assert(is_size_aligned(bytes, align), 2942 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align); 2943 2944 // Signal to OS that we want large pages for addresses 2945 // from addr, addr + bytes 2946 struct memcntl_mha mpss_struct; 2947 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 2948 mpss_struct.mha_pagesize = align; 2949 mpss_struct.mha_flags = 0; 2950 // Upon successful completion, memcntl() returns 0 2951 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) { 2952 debug_only(warning("Attempt to use MPSS failed.")); 2953 return false; 2954 } 2955 return true; 2956} 2957 2958char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) { 2959 fatal("os::reserve_memory_special should not be called on Solaris."); 2960 return NULL; 2961} 2962 2963bool os::release_memory_special(char* base, size_t bytes) { 2964 fatal("os::release_memory_special should not be called on Solaris."); 2965 return false; 2966} 2967 2968size_t os::large_page_size() { 2969 return _large_page_size; 2970} 2971 2972// MPSS allows application to commit large page memory on demand; with ISM 2973// the entire memory region must be allocated as shared memory. 2974bool os::can_commit_large_page_memory() { 2975 return true; 2976} 2977 2978bool os::can_execute_large_page_memory() { 2979 return true; 2980} 2981 2982// Read calls from inside the vm need to perform state transitions 2983size_t os::read(int fd, void *buf, unsigned int nBytes) { 2984 size_t res; 2985 JavaThread* thread = (JavaThread*)Thread::current(); 2986 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 2987 ThreadBlockInVM tbiv(thread); 2988 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 2989 return res; 2990} 2991 2992size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 2993 size_t res; 2994 JavaThread* thread = (JavaThread*)Thread::current(); 2995 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 2996 ThreadBlockInVM tbiv(thread); 2997 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res); 2998 return res; 2999} 3000 3001size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) { 3002 size_t res; 3003 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 3004 "Assumed _thread_in_native"); 3005 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 3006 return res; 3007} 3008 3009void os::naked_short_sleep(jlong ms) { 3010 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3011 3012 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but 3013 // Solaris requires -lrt for this. 3014 usleep((ms * 1000)); 3015 3016 return; 3017} 3018 3019// Sleep forever; naked call to OS-specific sleep; use with CAUTION 3020void os::infinite_sleep() { 3021 while (true) { // sleep forever ... 3022 ::sleep(100); // ... 100 seconds at a time 3023 } 3024} 3025 3026// Used to convert frequent JVM_Yield() to nops 3027bool os::dont_yield() { 3028 if (DontYieldALot) { 3029 static hrtime_t last_time = 0; 3030 hrtime_t diff = getTimeNanos() - last_time; 3031 3032 if (diff < DontYieldALotInterval * 1000000) { 3033 return true; 3034 } 3035 3036 last_time += diff; 3037 3038 return false; 3039 } else { 3040 return false; 3041 } 3042} 3043 3044// Note that yield semantics are defined by the scheduling class to which 3045// the thread currently belongs. Typically, yield will _not yield to 3046// other equal or higher priority threads that reside on the dispatch queues 3047// of other CPUs. 3048 3049void os::naked_yield() { 3050 thr_yield(); 3051} 3052 3053// Interface for setting lwp priorities. If we are using T2 libthread, 3054// which forces the use of BoundThreads or we manually set UseBoundThreads, 3055// all of our threads will be assigned to real lwp's. Using the thr_setprio 3056// function is meaningless in this mode so we must adjust the real lwp's priority 3057// The routines below implement the getting and setting of lwp priorities. 3058// 3059// Note: T2 is now the only supported libthread. UseBoundThreads flag is 3060// being deprecated and all threads are now BoundThreads 3061// 3062// Note: There are three priority scales used on Solaris. Java priotities 3063// which range from 1 to 10, libthread "thr_setprio" scale which range 3064// from 0 to 127, and the current scheduling class of the process we 3065// are running in. This is typically from -60 to +60. 3066// The setting of the lwp priorities in done after a call to thr_setprio 3067// so Java priorities are mapped to libthread priorities and we map from 3068// the latter to lwp priorities. We don't keep priorities stored in 3069// Java priorities since some of our worker threads want to set priorities 3070// higher than all Java threads. 3071// 3072// For related information: 3073// (1) man -s 2 priocntl 3074// (2) man -s 4 priocntl 3075// (3) man dispadmin 3076// = librt.so 3077// = libthread/common/rtsched.c - thrp_setlwpprio(). 3078// = ps -cL <pid> ... to validate priority. 3079// = sched_get_priority_min and _max 3080// pthread_create 3081// sched_setparam 3082// pthread_setschedparam 3083// 3084// Assumptions: 3085// + We assume that all threads in the process belong to the same 3086// scheduling class. IE. an homogenous process. 3087// + Must be root or in IA group to change change "interactive" attribute. 3088// Priocntl() will fail silently. The only indication of failure is when 3089// we read-back the value and notice that it hasn't changed. 3090// + Interactive threads enter the runq at the head, non-interactive at the tail. 3091// + For RT, change timeslice as well. Invariant: 3092// constant "priority integral" 3093// Konst == TimeSlice * (60-Priority) 3094// Given a priority, compute appropriate timeslice. 3095// + Higher numerical values have higher priority. 3096 3097// sched class attributes 3098typedef struct { 3099 int schedPolicy; // classID 3100 int maxPrio; 3101 int minPrio; 3102} SchedInfo; 3103 3104 3105static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; 3106 3107#ifdef ASSERT 3108static int ReadBackValidate = 1; 3109#endif 3110static int myClass = 0; 3111static int myMin = 0; 3112static int myMax = 0; 3113static int myCur = 0; 3114static bool priocntl_enable = false; 3115 3116static const int criticalPrio = FXCriticalPriority; 3117static int java_MaxPriority_to_os_priority = 0; // Saved mapping 3118 3119 3120// lwp_priocntl_init 3121// 3122// Try to determine the priority scale for our process. 3123// 3124// Return errno or 0 if OK. 3125// 3126static int lwp_priocntl_init() { 3127 int rslt; 3128 pcinfo_t ClassInfo; 3129 pcparms_t ParmInfo; 3130 int i; 3131 3132 if (!UseThreadPriorities) return 0; 3133 3134 // If ThreadPriorityPolicy is 1, switch tables 3135 if (ThreadPriorityPolicy == 1) { 3136 for (i = 0; i < CriticalPriority+1; i++) 3137 os::java_to_os_priority[i] = prio_policy1[i]; 3138 } 3139 if (UseCriticalJavaThreadPriority) { 3140 // MaxPriority always maps to the FX scheduling class and criticalPrio. 3141 // See set_native_priority() and set_lwp_class_and_priority(). 3142 // Save original MaxPriority mapping in case attempt to 3143 // use critical priority fails. 3144 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; 3145 // Set negative to distinguish from other priorities 3146 os::java_to_os_priority[MaxPriority] = -criticalPrio; 3147 } 3148 3149 // Get IDs for a set of well-known scheduling classes. 3150 // TODO-FIXME: GETCLINFO returns the current # of classes in the 3151 // the system. We should have a loop that iterates over the 3152 // classID values, which are known to be "small" integers. 3153 3154 strcpy(ClassInfo.pc_clname, "TS"); 3155 ClassInfo.pc_cid = -1; 3156 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3157 if (rslt < 0) return errno; 3158 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 3159 tsLimits.schedPolicy = ClassInfo.pc_cid; 3160 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 3161 tsLimits.minPrio = -tsLimits.maxPrio; 3162 3163 strcpy(ClassInfo.pc_clname, "IA"); 3164 ClassInfo.pc_cid = -1; 3165 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3166 if (rslt < 0) return errno; 3167 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 3168 iaLimits.schedPolicy = ClassInfo.pc_cid; 3169 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 3170 iaLimits.minPrio = -iaLimits.maxPrio; 3171 3172 strcpy(ClassInfo.pc_clname, "RT"); 3173 ClassInfo.pc_cid = -1; 3174 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3175 if (rslt < 0) return errno; 3176 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 3177 rtLimits.schedPolicy = ClassInfo.pc_cid; 3178 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 3179 rtLimits.minPrio = 0; 3180 3181 strcpy(ClassInfo.pc_clname, "FX"); 3182 ClassInfo.pc_cid = -1; 3183 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3184 if (rslt < 0) return errno; 3185 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); 3186 fxLimits.schedPolicy = ClassInfo.pc_cid; 3187 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; 3188 fxLimits.minPrio = 0; 3189 3190 // Query our "current" scheduling class. 3191 // This will normally be IA, TS or, rarely, FX or RT. 3192 memset(&ParmInfo, 0, sizeof(ParmInfo)); 3193 ParmInfo.pc_cid = PC_CLNULL; 3194 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3195 if (rslt < 0) return errno; 3196 myClass = ParmInfo.pc_cid; 3197 3198 // We now know our scheduling classId, get specific information 3199 // about the class. 3200 ClassInfo.pc_cid = myClass; 3201 ClassInfo.pc_clname[0] = 0; 3202 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); 3203 if (rslt < 0) return errno; 3204 3205 if (ThreadPriorityVerbose) { 3206 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 3207 } 3208 3209 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3210 ParmInfo.pc_cid = PC_CLNULL; 3211 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3212 if (rslt < 0) return errno; 3213 3214 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3215 myMin = rtLimits.minPrio; 3216 myMax = rtLimits.maxPrio; 3217 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3218 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3219 myMin = iaLimits.minPrio; 3220 myMax = iaLimits.maxPrio; 3221 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 3222 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3223 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3224 myMin = tsLimits.minPrio; 3225 myMax = tsLimits.maxPrio; 3226 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 3227 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3228 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3229 myMin = fxLimits.minPrio; 3230 myMax = fxLimits.maxPrio; 3231 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict 3232 } else { 3233 // No clue - punt 3234 if (ThreadPriorityVerbose) { 3235 tty->print_cr("Unknown scheduling class: %s ... \n", 3236 ClassInfo.pc_clname); 3237 } 3238 return EINVAL; // no clue, punt 3239 } 3240 3241 if (ThreadPriorityVerbose) { 3242 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax); 3243 } 3244 3245 priocntl_enable = true; // Enable changing priorities 3246 return 0; 3247} 3248 3249#define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 3250#define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 3251#define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 3252#define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) 3253 3254 3255// scale_to_lwp_priority 3256// 3257// Convert from the libthread "thr_setprio" scale to our current 3258// lwp scheduling class scale. 3259// 3260static int scale_to_lwp_priority(int rMin, int rMax, int x) { 3261 int v; 3262 3263 if (x == 127) return rMax; // avoid round-down 3264 v = (((x*(rMax-rMin)))/128)+rMin; 3265 return v; 3266} 3267 3268 3269// set_lwp_class_and_priority 3270int set_lwp_class_and_priority(int ThreadID, int lwpid, 3271 int newPrio, int new_class, bool scale) { 3272 int rslt; 3273 int Actual, Expected, prv; 3274 pcparms_t ParmInfo; // for GET-SET 3275#ifdef ASSERT 3276 pcparms_t ReadBack; // for readback 3277#endif 3278 3279 // Set priority via PC_GETPARMS, update, PC_SETPARMS 3280 // Query current values. 3281 // TODO: accelerate this by eliminating the PC_GETPARMS call. 3282 // Cache "pcparms_t" in global ParmCache. 3283 // TODO: elide set-to-same-value 3284 3285 // If something went wrong on init, don't change priorities. 3286 if (!priocntl_enable) { 3287 if (ThreadPriorityVerbose) { 3288 tty->print_cr("Trying to set priority but init failed, ignoring"); 3289 } 3290 return EINVAL; 3291 } 3292 3293 // If lwp hasn't started yet, just return 3294 // the _start routine will call us again. 3295 if (lwpid <= 0) { 3296 if (ThreadPriorityVerbose) { 3297 tty->print_cr("deferring the set_lwp_class_and_priority of thread " 3298 INTPTR_FORMAT " to %d, lwpid not set", 3299 ThreadID, newPrio); 3300 } 3301 return 0; 3302 } 3303 3304 if (ThreadPriorityVerbose) { 3305 tty->print_cr ("set_lwp_class_and_priority(" 3306 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 3307 ThreadID, lwpid, newPrio); 3308 } 3309 3310 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3311 ParmInfo.pc_cid = PC_CLNULL; 3312 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 3313 if (rslt < 0) return errno; 3314 3315 int cur_class = ParmInfo.pc_cid; 3316 ParmInfo.pc_cid = (id_t)new_class; 3317 3318 if (new_class == rtLimits.schedPolicy) { 3319 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 3320 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, 3321 rtLimits.maxPrio, newPrio) 3322 : newPrio; 3323 rtInfo->rt_tqsecs = RT_NOCHANGE; 3324 rtInfo->rt_tqnsecs = RT_NOCHANGE; 3325 if (ThreadPriorityVerbose) { 3326 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 3327 } 3328 } else if (new_class == iaLimits.schedPolicy) { 3329 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3330 int maxClamped = MIN2(iaLimits.maxPrio, 3331 cur_class == new_class 3332 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); 3333 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, 3334 maxClamped, newPrio) 3335 : newPrio; 3336 iaInfo->ia_uprilim = cur_class == new_class 3337 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; 3338 iaInfo->ia_mode = IA_NOCHANGE; 3339 if (ThreadPriorityVerbose) { 3340 tty->print_cr("IA: [%d...%d] %d->%d\n", 3341 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 3342 } 3343 } else if (new_class == tsLimits.schedPolicy) { 3344 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3345 int maxClamped = MIN2(tsLimits.maxPrio, 3346 cur_class == new_class 3347 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); 3348 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, 3349 maxClamped, newPrio) 3350 : newPrio; 3351 tsInfo->ts_uprilim = cur_class == new_class 3352 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; 3353 if (ThreadPriorityVerbose) { 3354 tty->print_cr("TS: [%d...%d] %d->%d\n", 3355 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 3356 } 3357 } else if (new_class == fxLimits.schedPolicy) { 3358 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3359 int maxClamped = MIN2(fxLimits.maxPrio, 3360 cur_class == new_class 3361 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); 3362 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, 3363 maxClamped, newPrio) 3364 : newPrio; 3365 fxInfo->fx_uprilim = cur_class == new_class 3366 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; 3367 fxInfo->fx_tqsecs = FX_NOCHANGE; 3368 fxInfo->fx_tqnsecs = FX_NOCHANGE; 3369 if (ThreadPriorityVerbose) { 3370 tty->print_cr("FX: [%d...%d] %d->%d\n", 3371 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); 3372 } 3373 } else { 3374 if (ThreadPriorityVerbose) { 3375 tty->print_cr("Unknown new scheduling class %d\n", new_class); 3376 } 3377 return EINVAL; // no clue, punt 3378 } 3379 3380 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 3381 if (ThreadPriorityVerbose && rslt) { 3382 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 3383 } 3384 if (rslt < 0) return errno; 3385 3386#ifdef ASSERT 3387 // Sanity check: read back what we just attempted to set. 3388 // In theory it could have changed in the interim ... 3389 // 3390 // The priocntl system call is tricky. 3391 // Sometimes it'll validate the priority value argument and 3392 // return EINVAL if unhappy. At other times it fails silently. 3393 // Readbacks are prudent. 3394 3395 if (!ReadBackValidate) return 0; 3396 3397 memset(&ReadBack, 0, sizeof(pcparms_t)); 3398 ReadBack.pc_cid = PC_CLNULL; 3399 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 3400 assert(rslt >= 0, "priocntl failed"); 3401 Actual = Expected = 0xBAD; 3402 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3403 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3404 Actual = RTPRI(ReadBack)->rt_pri; 3405 Expected = RTPRI(ParmInfo)->rt_pri; 3406 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3407 Actual = IAPRI(ReadBack)->ia_upri; 3408 Expected = IAPRI(ParmInfo)->ia_upri; 3409 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3410 Actual = TSPRI(ReadBack)->ts_upri; 3411 Expected = TSPRI(ParmInfo)->ts_upri; 3412 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3413 Actual = FXPRI(ReadBack)->fx_upri; 3414 Expected = FXPRI(ParmInfo)->fx_upri; 3415 } else { 3416 if (ThreadPriorityVerbose) { 3417 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", 3418 ParmInfo.pc_cid); 3419 } 3420 } 3421 3422 if (Actual != Expected) { 3423 if (ThreadPriorityVerbose) { 3424 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 3425 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 3426 } 3427 } 3428#endif 3429 3430 return 0; 3431} 3432 3433// Solaris only gives access to 128 real priorities at a time, 3434// so we expand Java's ten to fill this range. This would be better 3435// if we dynamically adjusted relative priorities. 3436// 3437// The ThreadPriorityPolicy option allows us to select 2 different 3438// priority scales. 3439// 3440// ThreadPriorityPolicy=0 3441// Since the Solaris' default priority is MaximumPriority, we do not 3442// set a priority lower than Max unless a priority lower than 3443// NormPriority is requested. 3444// 3445// ThreadPriorityPolicy=1 3446// This mode causes the priority table to get filled with 3447// linear values. NormPriority get's mapped to 50% of the 3448// Maximum priority an so on. This will cause VM threads 3449// to get unfair treatment against other Solaris processes 3450// which do not explicitly alter their thread priorities. 3451 3452int os::java_to_os_priority[CriticalPriority + 1] = { 3453 -99999, // 0 Entry should never be used 3454 3455 0, // 1 MinPriority 3456 32, // 2 3457 64, // 3 3458 3459 96, // 4 3460 127, // 5 NormPriority 3461 127, // 6 3462 3463 127, // 7 3464 127, // 8 3465 127, // 9 NearMaxPriority 3466 3467 127, // 10 MaxPriority 3468 3469 -criticalPrio // 11 CriticalPriority 3470}; 3471 3472OSReturn os::set_native_priority(Thread* thread, int newpri) { 3473 OSThread* osthread = thread->osthread(); 3474 3475 // Save requested priority in case the thread hasn't been started 3476 osthread->set_native_priority(newpri); 3477 3478 // Check for critical priority request 3479 bool fxcritical = false; 3480 if (newpri == -criticalPrio) { 3481 fxcritical = true; 3482 newpri = criticalPrio; 3483 } 3484 3485 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 3486 if (!UseThreadPriorities) return OS_OK; 3487 3488 int status = 0; 3489 3490 if (!fxcritical) { 3491 // Use thr_setprio only if we have a priority that thr_setprio understands 3492 status = thr_setprio(thread->osthread()->thread_id(), newpri); 3493 } 3494 3495 int lwp_status = 3496 set_lwp_class_and_priority(osthread->thread_id(), 3497 osthread->lwp_id(), 3498 newpri, 3499 fxcritical ? fxLimits.schedPolicy : myClass, 3500 !fxcritical); 3501 if (lwp_status != 0 && fxcritical) { 3502 // Try again, this time without changing the scheduling class 3503 newpri = java_MaxPriority_to_os_priority; 3504 lwp_status = set_lwp_class_and_priority(osthread->thread_id(), 3505 osthread->lwp_id(), 3506 newpri, myClass, false); 3507 } 3508 status |= lwp_status; 3509 return (status == 0) ? OS_OK : OS_ERR; 3510} 3511 3512 3513OSReturn os::get_native_priority(const Thread* const thread, 3514 int *priority_ptr) { 3515 int p; 3516 if (!UseThreadPriorities) { 3517 *priority_ptr = NormalPriority; 3518 return OS_OK; 3519 } 3520 int status = thr_getprio(thread->osthread()->thread_id(), &p); 3521 if (status != 0) { 3522 return OS_ERR; 3523 } 3524 *priority_ptr = p; 3525 return OS_OK; 3526} 3527 3528 3529// Hint to the underlying OS that a task switch would not be good. 3530// Void return because it's a hint and can fail. 3531void os::hint_no_preempt() { 3532 schedctl_start(schedctl_init()); 3533} 3534 3535static void resume_clear_context(OSThread *osthread) { 3536 osthread->set_ucontext(NULL); 3537} 3538 3539static void suspend_save_context(OSThread *osthread, ucontext_t* context) { 3540 osthread->set_ucontext(context); 3541} 3542 3543static PosixSemaphore sr_semaphore; 3544 3545void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) { 3546 // Save and restore errno to avoid confusing native code with EINTR 3547 // after sigsuspend. 3548 int old_errno = errno; 3549 3550 OSThread* osthread = thread->osthread(); 3551 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 3552 3553 os::SuspendResume::State current = osthread->sr.state(); 3554 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 3555 suspend_save_context(osthread, uc); 3556 3557 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 3558 os::SuspendResume::State state = osthread->sr.suspended(); 3559 if (state == os::SuspendResume::SR_SUSPENDED) { 3560 sigset_t suspend_set; // signals for sigsuspend() 3561 3562 // get current set of blocked signals and unblock resume signal 3563 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 3564 sigdelset(&suspend_set, os::Solaris::SIGasync()); 3565 3566 sr_semaphore.signal(); 3567 // wait here until we are resumed 3568 while (1) { 3569 sigsuspend(&suspend_set); 3570 3571 os::SuspendResume::State result = osthread->sr.running(); 3572 if (result == os::SuspendResume::SR_RUNNING) { 3573 sr_semaphore.signal(); 3574 break; 3575 } 3576 } 3577 3578 } else if (state == os::SuspendResume::SR_RUNNING) { 3579 // request was cancelled, continue 3580 } else { 3581 ShouldNotReachHere(); 3582 } 3583 3584 resume_clear_context(osthread); 3585 } else if (current == os::SuspendResume::SR_RUNNING) { 3586 // request was cancelled, continue 3587 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 3588 // ignore 3589 } else { 3590 // ignore 3591 } 3592 3593 errno = old_errno; 3594} 3595 3596void os::print_statistics() { 3597} 3598 3599bool os::message_box(const char* title, const char* message) { 3600 int i; 3601 fdStream err(defaultStream::error_fd()); 3602 for (i = 0; i < 78; i++) err.print_raw("="); 3603 err.cr(); 3604 err.print_raw_cr(title); 3605 for (i = 0; i < 78; i++) err.print_raw("-"); 3606 err.cr(); 3607 err.print_raw_cr(message); 3608 for (i = 0; i < 78; i++) err.print_raw("="); 3609 err.cr(); 3610 3611 char buf[16]; 3612 // Prevent process from exiting upon "read error" without consuming all CPU 3613 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3614 3615 return buf[0] == 'y' || buf[0] == 'Y'; 3616} 3617 3618static int sr_notify(OSThread* osthread) { 3619 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync()); 3620 assert_status(status == 0, status, "thr_kill"); 3621 return status; 3622} 3623 3624// "Randomly" selected value for how long we want to spin 3625// before bailing out on suspending a thread, also how often 3626// we send a signal to a thread we want to resume 3627static const int RANDOMLY_LARGE_INTEGER = 1000000; 3628static const int RANDOMLY_LARGE_INTEGER2 = 100; 3629 3630static bool do_suspend(OSThread* osthread) { 3631 assert(osthread->sr.is_running(), "thread should be running"); 3632 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 3633 3634 // mark as suspended and send signal 3635 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 3636 // failed to switch, state wasn't running? 3637 ShouldNotReachHere(); 3638 return false; 3639 } 3640 3641 if (sr_notify(osthread) != 0) { 3642 ShouldNotReachHere(); 3643 } 3644 3645 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 3646 while (true) { 3647 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) { 3648 break; 3649 } else { 3650 // timeout 3651 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 3652 if (cancelled == os::SuspendResume::SR_RUNNING) { 3653 return false; 3654 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 3655 // make sure that we consume the signal on the semaphore as well 3656 sr_semaphore.wait(); 3657 break; 3658 } else { 3659 ShouldNotReachHere(); 3660 return false; 3661 } 3662 } 3663 } 3664 3665 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 3666 return true; 3667} 3668 3669static void do_resume(OSThread* osthread) { 3670 assert(osthread->sr.is_suspended(), "thread should be suspended"); 3671 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 3672 3673 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 3674 // failed to switch to WAKEUP_REQUEST 3675 ShouldNotReachHere(); 3676 return; 3677 } 3678 3679 while (true) { 3680 if (sr_notify(osthread) == 0) { 3681 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 3682 if (osthread->sr.is_running()) { 3683 return; 3684 } 3685 } 3686 } else { 3687 ShouldNotReachHere(); 3688 } 3689 } 3690 3691 guarantee(osthread->sr.is_running(), "Must be running!"); 3692} 3693 3694void os::SuspendedThreadTask::internal_do_task() { 3695 if (do_suspend(_thread->osthread())) { 3696 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3697 do_task(context); 3698 do_resume(_thread->osthread()); 3699 } 3700} 3701 3702class PcFetcher : public os::SuspendedThreadTask { 3703 public: 3704 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} 3705 ExtendedPC result(); 3706 protected: 3707 void do_task(const os::SuspendedThreadTaskContext& context); 3708 private: 3709 ExtendedPC _epc; 3710}; 3711 3712ExtendedPC PcFetcher::result() { 3713 guarantee(is_done(), "task is not done yet."); 3714 return _epc; 3715} 3716 3717void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { 3718 Thread* thread = context.thread(); 3719 OSThread* osthread = thread->osthread(); 3720 if (osthread->ucontext() != NULL) { 3721 _epc = os::Solaris::ucontext_get_pc((const ucontext_t *) context.ucontext()); 3722 } else { 3723 // NULL context is unexpected, double-check this is the VMThread 3724 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 3725 } 3726} 3727 3728// A lightweight implementation that does not suspend the target thread and 3729// thus returns only a hint. Used for profiling only! 3730ExtendedPC os::get_thread_pc(Thread* thread) { 3731 // Make sure that it is called by the watcher and the Threads lock is owned. 3732 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock"); 3733 // For now, is only used to profile the VM Thread 3734 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3735 PcFetcher fetcher(thread); 3736 fetcher.run(); 3737 return fetcher.result(); 3738} 3739 3740 3741// This does not do anything on Solaris. This is basically a hook for being 3742// able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 3743void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3744 const methodHandle& method, JavaCallArguments* args, 3745 Thread* thread) { 3746 f(value, method, args, thread); 3747} 3748 3749// This routine may be used by user applications as a "hook" to catch signals. 3750// The user-defined signal handler must pass unrecognized signals to this 3751// routine, and if it returns true (non-zero), then the signal handler must 3752// return immediately. If the flag "abort_if_unrecognized" is true, then this 3753// routine will never retun false (zero), but instead will execute a VM panic 3754// routine kill the process. 3755// 3756// If this routine returns false, it is OK to call it again. This allows 3757// the user-defined signal handler to perform checks either before or after 3758// the VM performs its own checks. Naturally, the user code would be making 3759// a serious error if it tried to handle an exception (such as a null check 3760// or breakpoint) that the VM was generating for its own correct operation. 3761// 3762// This routine may recognize any of the following kinds of signals: 3763// SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 3764// os::Solaris::SIGasync 3765// It should be consulted by handlers for any of those signals. 3766// 3767// The caller of this routine must pass in the three arguments supplied 3768// to the function referred to in the "sa_sigaction" (not the "sa_handler") 3769// field of the structure passed to sigaction(). This routine assumes that 3770// the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3771// 3772// Note that the VM will print warnings if it detects conflicting signal 3773// handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3774// 3775extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo, 3776 siginfo_t* siginfo, 3777 void* ucontext, 3778 int abort_if_unrecognized); 3779 3780 3781void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 3782 int orig_errno = errno; // Preserve errno value over signal handler. 3783 JVM_handle_solaris_signal(sig, info, ucVoid, true); 3784 errno = orig_errno; 3785} 3786 3787// This boolean allows users to forward their own non-matching signals 3788// to JVM_handle_solaris_signal, harmlessly. 3789bool os::Solaris::signal_handlers_are_installed = false; 3790 3791// For signal-chaining 3792bool os::Solaris::libjsig_is_loaded = false; 3793typedef struct sigaction *(*get_signal_t)(int); 3794get_signal_t os::Solaris::get_signal_action = NULL; 3795 3796struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 3797 struct sigaction *actp = NULL; 3798 3799 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) { 3800 // Retrieve the old signal handler from libjsig 3801 actp = (*get_signal_action)(sig); 3802 } 3803 if (actp == NULL) { 3804 // Retrieve the preinstalled signal handler from jvm 3805 actp = get_preinstalled_handler(sig); 3806 } 3807 3808 return actp; 3809} 3810 3811static bool call_chained_handler(struct sigaction *actp, int sig, 3812 siginfo_t *siginfo, void *context) { 3813 // Call the old signal handler 3814 if (actp->sa_handler == SIG_DFL) { 3815 // It's more reasonable to let jvm treat it as an unexpected exception 3816 // instead of taking the default action. 3817 return false; 3818 } else if (actp->sa_handler != SIG_IGN) { 3819 if ((actp->sa_flags & SA_NODEFER) == 0) { 3820 // automaticlly block the signal 3821 sigaddset(&(actp->sa_mask), sig); 3822 } 3823 3824 sa_handler_t hand; 3825 sa_sigaction_t sa; 3826 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3827 // retrieve the chained handler 3828 if (siginfo_flag_set) { 3829 sa = actp->sa_sigaction; 3830 } else { 3831 hand = actp->sa_handler; 3832 } 3833 3834 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3835 actp->sa_handler = SIG_DFL; 3836 } 3837 3838 // try to honor the signal mask 3839 sigset_t oset; 3840 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3841 3842 // call into the chained handler 3843 if (siginfo_flag_set) { 3844 (*sa)(sig, siginfo, context); 3845 } else { 3846 (*hand)(sig); 3847 } 3848 3849 // restore the signal mask 3850 pthread_sigmask(SIG_SETMASK, &oset, 0); 3851 } 3852 // Tell jvm's signal handler the signal is taken care of. 3853 return true; 3854} 3855 3856bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3857 bool chained = false; 3858 // signal-chaining 3859 if (UseSignalChaining) { 3860 struct sigaction *actp = get_chained_signal_action(sig); 3861 if (actp != NULL) { 3862 chained = call_chained_handler(actp, sig, siginfo, context); 3863 } 3864 } 3865 return chained; 3866} 3867 3868struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 3869 assert((chainedsigactions != (struct sigaction *)NULL) && 3870 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3871 if (preinstalled_sigs[sig] != 0) { 3872 return &chainedsigactions[sig]; 3873 } 3874 return NULL; 3875} 3876 3877void os::Solaris::save_preinstalled_handler(int sig, 3878 struct sigaction& oldAct) { 3879 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 3880 assert((chainedsigactions != (struct sigaction *)NULL) && 3881 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3882 chainedsigactions[sig] = oldAct; 3883 preinstalled_sigs[sig] = 1; 3884} 3885 3886void os::Solaris::set_signal_handler(int sig, bool set_installed, 3887 bool oktochain) { 3888 // Check for overwrite. 3889 struct sigaction oldAct; 3890 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3891 void* oldhand = 3892 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3893 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3894 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3895 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3896 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 3897 if (AllowUserSignalHandlers || !set_installed) { 3898 // Do not overwrite; user takes responsibility to forward to us. 3899 return; 3900 } else if (UseSignalChaining) { 3901 if (oktochain) { 3902 // save the old handler in jvm 3903 save_preinstalled_handler(sig, oldAct); 3904 } else { 3905 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal."); 3906 } 3907 // libjsig also interposes the sigaction() call below and saves the 3908 // old sigaction on it own. 3909 } else { 3910 fatal("Encountered unexpected pre-existing sigaction handler " 3911 "%#lx for signal %d.", (long)oldhand, sig); 3912 } 3913 } 3914 3915 struct sigaction sigAct; 3916 sigfillset(&(sigAct.sa_mask)); 3917 sigAct.sa_handler = SIG_DFL; 3918 3919 sigAct.sa_sigaction = signalHandler; 3920 // Handle SIGSEGV on alternate signal stack if 3921 // not using stack banging 3922 if (!UseStackBanging && sig == SIGSEGV) { 3923 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 3924 } else { 3925 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 3926 } 3927 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 3928 3929 sigaction(sig, &sigAct, &oldAct); 3930 3931 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3932 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3933 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3934} 3935 3936 3937#define DO_SIGNAL_CHECK(sig) \ 3938 do { \ 3939 if (!sigismember(&check_signal_done, sig)) { \ 3940 os::Solaris::check_signal_handler(sig); \ 3941 } \ 3942 } while (0) 3943 3944// This method is a periodic task to check for misbehaving JNI applications 3945// under CheckJNI, we can add any periodic checks here 3946 3947void os::run_periodic_checks() { 3948 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 3949 // thereby preventing a NULL checks. 3950 if (!check_addr0_done) check_addr0_done = check_addr0(tty); 3951 3952 if (check_signals == false) return; 3953 3954 // SEGV and BUS if overridden could potentially prevent 3955 // generation of hs*.log in the event of a crash, debugging 3956 // such a case can be very challenging, so we absolutely 3957 // check for the following for a good measure: 3958 DO_SIGNAL_CHECK(SIGSEGV); 3959 DO_SIGNAL_CHECK(SIGILL); 3960 DO_SIGNAL_CHECK(SIGFPE); 3961 DO_SIGNAL_CHECK(SIGBUS); 3962 DO_SIGNAL_CHECK(SIGPIPE); 3963 DO_SIGNAL_CHECK(SIGXFSZ); 3964 3965 // ReduceSignalUsage allows the user to override these handlers 3966 // see comments at the very top and jvm_solaris.h 3967 if (!ReduceSignalUsage) { 3968 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3969 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3970 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3971 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3972 } 3973 3974 // See comments above for using JVM1/JVM2 3975 DO_SIGNAL_CHECK(os::Solaris::SIGasync()); 3976 3977} 3978 3979typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3980 3981static os_sigaction_t os_sigaction = NULL; 3982 3983void os::Solaris::check_signal_handler(int sig) { 3984 char buf[O_BUFLEN]; 3985 address jvmHandler = NULL; 3986 3987 struct sigaction act; 3988 if (os_sigaction == NULL) { 3989 // only trust the default sigaction, in case it has been interposed 3990 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3991 if (os_sigaction == NULL) return; 3992 } 3993 3994 os_sigaction(sig, (struct sigaction*)NULL, &act); 3995 3996 address thisHandler = (act.sa_flags & SA_SIGINFO) 3997 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3998 : CAST_FROM_FN_PTR(address, act.sa_handler); 3999 4000 4001 switch (sig) { 4002 case SIGSEGV: 4003 case SIGBUS: 4004 case SIGFPE: 4005 case SIGPIPE: 4006 case SIGXFSZ: 4007 case SIGILL: 4008 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4009 break; 4010 4011 case SHUTDOWN1_SIGNAL: 4012 case SHUTDOWN2_SIGNAL: 4013 case SHUTDOWN3_SIGNAL: 4014 case BREAK_SIGNAL: 4015 jvmHandler = (address)user_handler(); 4016 break; 4017 4018 default: 4019 int asynsig = os::Solaris::SIGasync(); 4020 4021 if (sig == asynsig) { 4022 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4023 } else { 4024 return; 4025 } 4026 break; 4027 } 4028 4029 4030 if (thisHandler != jvmHandler) { 4031 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 4032 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 4033 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 4034 // No need to check this sig any longer 4035 sigaddset(&check_signal_done, sig); 4036 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 4037 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 4038 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 4039 exception_name(sig, buf, O_BUFLEN)); 4040 } 4041 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 4042 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 4043 tty->print("expected:"); 4044 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig)); 4045 tty->cr(); 4046 tty->print(" found:"); 4047 os::Posix::print_sa_flags(tty, act.sa_flags); 4048 tty->cr(); 4049 // No need to check this sig any longer 4050 sigaddset(&check_signal_done, sig); 4051 } 4052 4053 // Print all the signal handler state 4054 if (sigismember(&check_signal_done, sig)) { 4055 print_signal_handlers(tty, buf, O_BUFLEN); 4056 } 4057 4058} 4059 4060void os::Solaris::install_signal_handlers() { 4061 bool libjsigdone = false; 4062 signal_handlers_are_installed = true; 4063 4064 // signal-chaining 4065 typedef void (*signal_setting_t)(); 4066 signal_setting_t begin_signal_setting = NULL; 4067 signal_setting_t end_signal_setting = NULL; 4068 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4069 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 4070 if (begin_signal_setting != NULL) { 4071 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4072 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 4073 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 4074 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 4075 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t, 4076 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version")); 4077 libjsig_is_loaded = true; 4078 if (os::Solaris::get_libjsig_version != NULL) { 4079 libjsigversion = (*os::Solaris::get_libjsig_version)(); 4080 } 4081 assert(UseSignalChaining, "should enable signal-chaining"); 4082 } 4083 if (libjsig_is_loaded) { 4084 // Tell libjsig jvm is setting signal handlers 4085 (*begin_signal_setting)(); 4086 } 4087 4088 set_signal_handler(SIGSEGV, true, true); 4089 set_signal_handler(SIGPIPE, true, true); 4090 set_signal_handler(SIGXFSZ, true, true); 4091 set_signal_handler(SIGBUS, true, true); 4092 set_signal_handler(SIGILL, true, true); 4093 set_signal_handler(SIGFPE, true, true); 4094 4095 4096 if (os::Solaris::SIGasync() > OLDMAXSIGNUM) { 4097 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so 4098 // can not register overridable signals which might be > 32 4099 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) { 4100 // Tell libjsig jvm has finished setting signal handlers 4101 (*end_signal_setting)(); 4102 libjsigdone = true; 4103 } 4104 } 4105 4106 set_signal_handler(os::Solaris::SIGasync(), true, true); 4107 4108 if (libjsig_is_loaded && !libjsigdone) { 4109 // Tell libjsig jvm finishes setting signal handlers 4110 (*end_signal_setting)(); 4111 } 4112 4113 // We don't activate signal checker if libjsig is in place, we trust ourselves 4114 // and if UserSignalHandler is installed all bets are off. 4115 // Log that signal checking is off only if -verbose:jni is specified. 4116 if (CheckJNICalls) { 4117 if (libjsig_is_loaded) { 4118 if (PrintJNIResolving) { 4119 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 4120 } 4121 check_signals = false; 4122 } 4123 if (AllowUserSignalHandlers) { 4124 if (PrintJNIResolving) { 4125 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4126 } 4127 check_signals = false; 4128 } 4129 } 4130} 4131 4132 4133void report_error(const char* file_name, int line_no, const char* title, 4134 const char* format, ...); 4135 4136// (Static) wrappers for the liblgrp API 4137os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 4138os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 4139os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 4140os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 4141os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 4142os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 4143os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 4144os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 4145os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 4146 4147static address resolve_symbol_lazy(const char* name) { 4148 address addr = (address) dlsym(RTLD_DEFAULT, name); 4149 if (addr == NULL) { 4150 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 4151 addr = (address) dlsym(RTLD_NEXT, name); 4152 } 4153 return addr; 4154} 4155 4156static address resolve_symbol(const char* name) { 4157 address addr = resolve_symbol_lazy(name); 4158 if (addr == NULL) { 4159 fatal(dlerror()); 4160 } 4161 return addr; 4162} 4163 4164void os::Solaris::libthread_init() { 4165 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 4166 4167 lwp_priocntl_init(); 4168 4169 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 4170 if (func == NULL) { 4171 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 4172 // Guarantee that this VM is running on an new enough OS (5.6 or 4173 // later) that it will have a new enough libthread.so. 4174 guarantee(func != NULL, "libthread.so is too old."); 4175 } 4176 4177 int size; 4178 void (*handler_info_func)(address *, int *); 4179 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 4180 handler_info_func(&handler_start, &size); 4181 handler_end = handler_start + size; 4182} 4183 4184 4185int_fnP_mutex_tP os::Solaris::_mutex_lock; 4186int_fnP_mutex_tP os::Solaris::_mutex_trylock; 4187int_fnP_mutex_tP os::Solaris::_mutex_unlock; 4188int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 4189int_fnP_mutex_tP os::Solaris::_mutex_destroy; 4190int os::Solaris::_mutex_scope = USYNC_THREAD; 4191 4192int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 4193int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 4194int_fnP_cond_tP os::Solaris::_cond_signal; 4195int_fnP_cond_tP os::Solaris::_cond_broadcast; 4196int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 4197int_fnP_cond_tP os::Solaris::_cond_destroy; 4198int os::Solaris::_cond_scope = USYNC_THREAD; 4199 4200void os::Solaris::synchronization_init() { 4201 if (UseLWPSynchronization) { 4202 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 4203 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 4204 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 4205 os::Solaris::set_mutex_init(lwp_mutex_init); 4206 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 4207 os::Solaris::set_mutex_scope(USYNC_THREAD); 4208 4209 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 4210 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 4211 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 4212 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 4213 os::Solaris::set_cond_init(lwp_cond_init); 4214 os::Solaris::set_cond_destroy(lwp_cond_destroy); 4215 os::Solaris::set_cond_scope(USYNC_THREAD); 4216 } else { 4217 os::Solaris::set_mutex_scope(USYNC_THREAD); 4218 os::Solaris::set_cond_scope(USYNC_THREAD); 4219 4220 if (UsePthreads) { 4221 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 4222 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 4223 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 4224 os::Solaris::set_mutex_init(pthread_mutex_default_init); 4225 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 4226 4227 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 4228 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 4229 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 4230 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 4231 os::Solaris::set_cond_init(pthread_cond_default_init); 4232 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 4233 } else { 4234 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 4235 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 4236 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 4237 os::Solaris::set_mutex_init(::mutex_init); 4238 os::Solaris::set_mutex_destroy(::mutex_destroy); 4239 4240 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 4241 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 4242 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 4243 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 4244 os::Solaris::set_cond_init(::cond_init); 4245 os::Solaris::set_cond_destroy(::cond_destroy); 4246 } 4247 } 4248} 4249 4250bool os::Solaris::liblgrp_init() { 4251 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 4252 if (handle != NULL) { 4253 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 4254 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 4255 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 4256 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 4257 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 4258 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 4259 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 4260 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 4261 dlsym(handle, "lgrp_cookie_stale"))); 4262 4263 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 4264 set_lgrp_cookie(c); 4265 return true; 4266 } 4267 return false; 4268} 4269 4270// int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 4271typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 4272static pset_getloadavg_type pset_getloadavg_ptr = NULL; 4273 4274void init_pset_getloadavg_ptr(void) { 4275 pset_getloadavg_ptr = 4276 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 4277 if (pset_getloadavg_ptr == NULL) { 4278 log_warning(os)("pset_getloadavg function not found"); 4279 } 4280} 4281 4282int os::Solaris::_dev_zero_fd = -1; 4283 4284// this is called _before_ the global arguments have been parsed 4285void os::init(void) { 4286 _initial_pid = getpid(); 4287 4288 max_hrtime = first_hrtime = gethrtime(); 4289 4290 init_random(1234567); 4291 4292 page_size = sysconf(_SC_PAGESIZE); 4293 if (page_size == -1) { 4294 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 4295 } 4296 init_page_sizes((size_t) page_size); 4297 4298 Solaris::initialize_system_info(); 4299 4300 int fd = ::open("/dev/zero", O_RDWR); 4301 if (fd < 0) { 4302 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno)); 4303 } else { 4304 Solaris::set_dev_zero_fd(fd); 4305 4306 // Close on exec, child won't inherit. 4307 fcntl(fd, F_SETFD, FD_CLOEXEC); 4308 } 4309 4310 clock_tics_per_sec = CLK_TCK; 4311 4312 // check if dladdr1() exists; dladdr1 can provide more information than 4313 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 4314 // and is available on linker patches for 5.7 and 5.8. 4315 // libdl.so must have been loaded, this call is just an entry lookup 4316 void * hdl = dlopen("libdl.so", RTLD_NOW); 4317 if (hdl) { 4318 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 4319 } 4320 4321 // (Solaris only) this switches to calls that actually do locking. 4322 ThreadCritical::initialize(); 4323 4324 main_thread = thr_self(); 4325 4326 // Constant minimum stack size allowed. It must be at least 4327 // the minimum of what the OS supports (thr_min_stack()), and 4328 // enough to allow the thread to get to user bytecode execution. 4329 Posix::_compiler_thread_min_stack_allowed = MAX2(thr_min_stack(), 4330 Posix::_compiler_thread_min_stack_allowed); 4331 Posix::_java_thread_min_stack_allowed = MAX2(thr_min_stack(), 4332 Posix::_java_thread_min_stack_allowed); 4333 Posix::_vm_internal_thread_min_stack_allowed = MAX2(thr_min_stack(), 4334 Posix::_vm_internal_thread_min_stack_allowed); 4335 4336 // dynamic lookup of functions that may not be available in our lowest 4337 // supported Solaris release 4338 void * handle = dlopen("libc.so.1", RTLD_LAZY); 4339 if (handle != NULL) { 4340 Solaris::_pthread_setname_np = // from 11.3 4341 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np"); 4342 } 4343} 4344 4345// To install functions for atexit system call 4346extern "C" { 4347 static void perfMemory_exit_helper() { 4348 perfMemory_exit(); 4349 } 4350} 4351 4352// this is called _after_ the global arguments have been parsed 4353jint os::init_2(void) { 4354 // try to enable extended file IO ASAP, see 6431278 4355 os::Solaris::try_enable_extended_io(); 4356 4357 // Allocate a single page and mark it as readable for safepoint polling. Also 4358 // use this first mmap call to check support for MAP_ALIGN. 4359 address polling_page = (address)Solaris::mmap_chunk((char*)page_size, 4360 page_size, 4361 MAP_PRIVATE | MAP_ALIGN, 4362 PROT_READ); 4363 if (polling_page == NULL) { 4364 has_map_align = false; 4365 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, 4366 PROT_READ); 4367 } 4368 4369 os::set_polling_page(polling_page); 4370 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page)); 4371 4372 if (!UseMembar) { 4373 address mem_serialize_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE); 4374 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 4375 os::set_memory_serialize_page(mem_serialize_page); 4376 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page)); 4377 } 4378 4379 // Check and sets minimum stack sizes against command line options 4380 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 4381 return JNI_ERR; 4382 } 4383 4384 Solaris::libthread_init(); 4385 4386 if (UseNUMA) { 4387 if (!Solaris::liblgrp_init()) { 4388 UseNUMA = false; 4389 } else { 4390 size_t lgrp_limit = os::numa_get_groups_num(); 4391 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); 4392 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 4393 FREE_C_HEAP_ARRAY(int, lgrp_ids); 4394 if (lgrp_num < 2) { 4395 // There's only one locality group, disable NUMA. 4396 UseNUMA = false; 4397 } 4398 } 4399 if (!UseNUMA && ForceNUMA) { 4400 UseNUMA = true; 4401 } 4402 } 4403 4404 Solaris::signal_sets_init(); 4405 Solaris::init_signal_mem(); 4406 Solaris::install_signal_handlers(); 4407 4408 if (libjsigversion < JSIG_VERSION_1_4_1) { 4409 Maxlibjsigsigs = OLDMAXSIGNUM; 4410 } 4411 4412 // initialize synchronization primitives to use either thread or 4413 // lwp synchronization (controlled by UseLWPSynchronization) 4414 Solaris::synchronization_init(); 4415 4416 if (MaxFDLimit) { 4417 // set the number of file descriptors to max. print out error 4418 // if getrlimit/setrlimit fails but continue regardless. 4419 struct rlimit nbr_files; 4420 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 4421 if (status != 0) { 4422 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 4423 } else { 4424 nbr_files.rlim_cur = nbr_files.rlim_max; 4425 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 4426 if (status != 0) { 4427 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 4428 } 4429 } 4430 } 4431 4432 // Calculate theoretical max. size of Threads to guard gainst 4433 // artifical out-of-memory situations, where all available address- 4434 // space has been reserved by thread stacks. Default stack size is 1Mb. 4435 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 4436 JavaThread::stack_size_at_create() : (1*K*K); 4437 assert(pre_thread_stack_size != 0, "Must have a stack"); 4438 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 4439 // we should start doing Virtual Memory banging. Currently when the threads will 4440 // have used all but 200Mb of space. 4441 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 4442 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 4443 4444 // at-exit methods are called in the reverse order of their registration. 4445 // In Solaris 7 and earlier, atexit functions are called on return from 4446 // main or as a result of a call to exit(3C). There can be only 32 of 4447 // these functions registered and atexit() does not set errno. In Solaris 4448 // 8 and later, there is no limit to the number of functions registered 4449 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 4450 // functions are called upon dlclose(3DL) in addition to return from main 4451 // and exit(3C). 4452 4453 if (PerfAllowAtExitRegistration) { 4454 // only register atexit functions if PerfAllowAtExitRegistration is set. 4455 // atexit functions can be delayed until process exit time, which 4456 // can be problematic for embedded VM situations. Embedded VMs should 4457 // call DestroyJavaVM() to assure that VM resources are released. 4458 4459 // note: perfMemory_exit_helper atexit function may be removed in 4460 // the future if the appropriate cleanup code can be added to the 4461 // VM_Exit VMOperation's doit method. 4462 if (atexit(perfMemory_exit_helper) != 0) { 4463 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 4464 } 4465 } 4466 4467 // Init pset_loadavg function pointer 4468 init_pset_getloadavg_ptr(); 4469 4470 return JNI_OK; 4471} 4472 4473// Mark the polling page as unreadable 4474void os::make_polling_page_unreadable(void) { 4475 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) { 4476 fatal("Could not disable polling page"); 4477 } 4478} 4479 4480// Mark the polling page as readable 4481void os::make_polling_page_readable(void) { 4482 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) { 4483 fatal("Could not enable polling page"); 4484 } 4485} 4486 4487// Is a (classpath) directory empty? 4488bool os::dir_is_empty(const char* path) { 4489 DIR *dir = NULL; 4490 struct dirent *ptr; 4491 4492 dir = opendir(path); 4493 if (dir == NULL) return true; 4494 4495 // Scan the directory 4496 bool result = true; 4497 char buf[sizeof(struct dirent) + MAX_PATH]; 4498 struct dirent *dbuf = (struct dirent *) buf; 4499 while (result && (ptr = readdir(dir, dbuf)) != NULL) { 4500 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 4501 result = false; 4502 } 4503 } 4504 closedir(dir); 4505 return result; 4506} 4507 4508// This code originates from JDK's sysOpen and open64_w 4509// from src/solaris/hpi/src/system_md.c 4510 4511int os::open(const char *path, int oflag, int mode) { 4512 if (strlen(path) > MAX_PATH - 1) { 4513 errno = ENAMETOOLONG; 4514 return -1; 4515 } 4516 int fd; 4517 4518 fd = ::open64(path, oflag, mode); 4519 if (fd == -1) return -1; 4520 4521 // If the open succeeded, the file might still be a directory 4522 { 4523 struct stat64 buf64; 4524 int ret = ::fstat64(fd, &buf64); 4525 int st_mode = buf64.st_mode; 4526 4527 if (ret != -1) { 4528 if ((st_mode & S_IFMT) == S_IFDIR) { 4529 errno = EISDIR; 4530 ::close(fd); 4531 return -1; 4532 } 4533 } else { 4534 ::close(fd); 4535 return -1; 4536 } 4537 } 4538 4539 // 32-bit Solaris systems suffer from: 4540 // 4541 // - an historical default soft limit of 256 per-process file 4542 // descriptors that is too low for many Java programs. 4543 // 4544 // - a design flaw where file descriptors created using stdio 4545 // fopen must be less than 256, _even_ when the first limit above 4546 // has been raised. This can cause calls to fopen (but not calls to 4547 // open, for example) to fail mysteriously, perhaps in 3rd party 4548 // native code (although the JDK itself uses fopen). One can hardly 4549 // criticize them for using this most standard of all functions. 4550 // 4551 // We attempt to make everything work anyways by: 4552 // 4553 // - raising the soft limit on per-process file descriptors beyond 4554 // 256 4555 // 4556 // - As of Solaris 10u4, we can request that Solaris raise the 256 4557 // stdio fopen limit by calling function enable_extended_FILE_stdio. 4558 // This is done in init_2 and recorded in enabled_extended_FILE_stdio 4559 // 4560 // - If we are stuck on an old (pre 10u4) Solaris system, we can 4561 // workaround the bug by remapping non-stdio file descriptors below 4562 // 256 to ones beyond 256, which is done below. 4563 // 4564 // See: 4565 // 1085341: 32-bit stdio routines should support file descriptors >255 4566 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files 4567 // 6431278: Netbeans crash on 32 bit Solaris: need to call 4568 // enable_extended_FILE_stdio() in VM initialisation 4569 // Giri Mandalika's blog 4570 // http://technopark02.blogspot.com/2005_05_01_archive.html 4571 // 4572#ifndef _LP64 4573 if ((!enabled_extended_FILE_stdio) && fd < 256) { 4574 int newfd = ::fcntl(fd, F_DUPFD, 256); 4575 if (newfd != -1) { 4576 ::close(fd); 4577 fd = newfd; 4578 } 4579 } 4580#endif // 32-bit Solaris 4581 4582 // All file descriptors that are opened in the JVM and not 4583 // specifically destined for a subprocess should have the 4584 // close-on-exec flag set. If we don't set it, then careless 3rd 4585 // party native code might fork and exec without closing all 4586 // appropriate file descriptors (e.g. as we do in closeDescriptors in 4587 // UNIXProcess.c), and this in turn might: 4588 // 4589 // - cause end-of-file to fail to be detected on some file 4590 // descriptors, resulting in mysterious hangs, or 4591 // 4592 // - might cause an fopen in the subprocess to fail on a system 4593 // suffering from bug 1085341. 4594 // 4595 // (Yes, the default setting of the close-on-exec flag is a Unix 4596 // design flaw) 4597 // 4598 // See: 4599 // 1085341: 32-bit stdio routines should support file descriptors >255 4600 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 4601 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 4602 // 4603#ifdef FD_CLOEXEC 4604 { 4605 int flags = ::fcntl(fd, F_GETFD); 4606 if (flags != -1) { 4607 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 4608 } 4609 } 4610#endif 4611 4612 return fd; 4613} 4614 4615// create binary file, rewriting existing file if required 4616int os::create_binary_file(const char* path, bool rewrite_existing) { 4617 int oflags = O_WRONLY | O_CREAT; 4618 if (!rewrite_existing) { 4619 oflags |= O_EXCL; 4620 } 4621 return ::open64(path, oflags, S_IREAD | S_IWRITE); 4622} 4623 4624// return current position of file pointer 4625jlong os::current_file_offset(int fd) { 4626 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 4627} 4628 4629// move file pointer to the specified offset 4630jlong os::seek_to_file_offset(int fd, jlong offset) { 4631 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 4632} 4633 4634jlong os::lseek(int fd, jlong offset, int whence) { 4635 return (jlong) ::lseek64(fd, offset, whence); 4636} 4637 4638char * os::native_path(char *path) { 4639 return path; 4640} 4641 4642int os::ftruncate(int fd, jlong length) { 4643 return ::ftruncate64(fd, length); 4644} 4645 4646int os::fsync(int fd) { 4647 RESTARTABLE_RETURN_INT(::fsync(fd)); 4648} 4649 4650int os::available(int fd, jlong *bytes) { 4651 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 4652 "Assumed _thread_in_native"); 4653 jlong cur, end; 4654 int mode; 4655 struct stat64 buf64; 4656 4657 if (::fstat64(fd, &buf64) >= 0) { 4658 mode = buf64.st_mode; 4659 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 4660 int n,ioctl_return; 4661 4662 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return); 4663 if (ioctl_return>= 0) { 4664 *bytes = n; 4665 return 1; 4666 } 4667 } 4668 } 4669 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 4670 return 0; 4671 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 4672 return 0; 4673 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 4674 return 0; 4675 } 4676 *bytes = end - cur; 4677 return 1; 4678} 4679 4680// Map a block of memory. 4681char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4682 char *addr, size_t bytes, bool read_only, 4683 bool allow_exec) { 4684 int prot; 4685 int flags; 4686 4687 if (read_only) { 4688 prot = PROT_READ; 4689 flags = MAP_SHARED; 4690 } else { 4691 prot = PROT_READ | PROT_WRITE; 4692 flags = MAP_PRIVATE; 4693 } 4694 4695 if (allow_exec) { 4696 prot |= PROT_EXEC; 4697 } 4698 4699 if (addr != NULL) { 4700 flags |= MAP_FIXED; 4701 } 4702 4703 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 4704 fd, file_offset); 4705 if (mapped_address == MAP_FAILED) { 4706 return NULL; 4707 } 4708 return mapped_address; 4709} 4710 4711 4712// Remap a block of memory. 4713char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4714 char *addr, size_t bytes, bool read_only, 4715 bool allow_exec) { 4716 // same as map_memory() on this OS 4717 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4718 allow_exec); 4719} 4720 4721 4722// Unmap a block of memory. 4723bool os::pd_unmap_memory(char* addr, size_t bytes) { 4724 return munmap(addr, bytes) == 0; 4725} 4726 4727void os::pause() { 4728 char filename[MAX_PATH]; 4729 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4730 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4731 } else { 4732 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4733 } 4734 4735 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4736 if (fd != -1) { 4737 struct stat buf; 4738 ::close(fd); 4739 while (::stat(filename, &buf) == 0) { 4740 (void)::poll(NULL, 0, 100); 4741 } 4742 } else { 4743 jio_fprintf(stderr, 4744 "Could not open pause file '%s', continuing immediately.\n", filename); 4745 } 4746} 4747 4748#ifndef PRODUCT 4749#ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4750// Turn this on if you need to trace synch operations. 4751// Set RECORD_SYNCH_LIMIT to a large-enough value, 4752// and call record_synch_enable and record_synch_disable 4753// around the computation of interest. 4754 4755void record_synch(char* name, bool returning); // defined below 4756 4757class RecordSynch { 4758 char* _name; 4759 public: 4760 RecordSynch(char* name) :_name(name) { record_synch(_name, false); } 4761 ~RecordSynch() { record_synch(_name, true); } 4762}; 4763 4764#define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 4765extern "C" ret name params { \ 4766 typedef ret name##_t params; \ 4767 static name##_t* implem = NULL; \ 4768 static int callcount = 0; \ 4769 if (implem == NULL) { \ 4770 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 4771 if (implem == NULL) fatal(dlerror()); \ 4772 } \ 4773 ++callcount; \ 4774 RecordSynch _rs(#name); \ 4775 inner; \ 4776 return implem args; \ 4777} 4778// in dbx, examine callcounts this way: 4779// for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 4780 4781#define CHECK_POINTER_OK(p) \ 4782 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) 4783#define CHECK_MU \ 4784 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 4785#define CHECK_CV \ 4786 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 4787#define CHECK_P(p) \ 4788 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 4789 4790#define CHECK_MUTEX(mutex_op) \ 4791 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 4792 4793CHECK_MUTEX( mutex_lock) 4794CHECK_MUTEX( _mutex_lock) 4795CHECK_MUTEX( mutex_unlock) 4796CHECK_MUTEX(_mutex_unlock) 4797CHECK_MUTEX( mutex_trylock) 4798CHECK_MUTEX(_mutex_trylock) 4799 4800#define CHECK_COND(cond_op) \ 4801 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV); 4802 4803CHECK_COND( cond_wait); 4804CHECK_COND(_cond_wait); 4805CHECK_COND(_cond_wait_cancel); 4806 4807#define CHECK_COND2(cond_op) \ 4808 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV); 4809 4810CHECK_COND2( cond_timedwait); 4811CHECK_COND2(_cond_timedwait); 4812CHECK_COND2(_cond_timedwait_cancel); 4813 4814// do the _lwp_* versions too 4815#define mutex_t lwp_mutex_t 4816#define cond_t lwp_cond_t 4817CHECK_MUTEX( _lwp_mutex_lock) 4818CHECK_MUTEX( _lwp_mutex_unlock) 4819CHECK_MUTEX( _lwp_mutex_trylock) 4820CHECK_MUTEX( __lwp_mutex_lock) 4821CHECK_MUTEX( __lwp_mutex_unlock) 4822CHECK_MUTEX( __lwp_mutex_trylock) 4823CHECK_MUTEX(___lwp_mutex_lock) 4824CHECK_MUTEX(___lwp_mutex_unlock) 4825 4826CHECK_COND( _lwp_cond_wait); 4827CHECK_COND( __lwp_cond_wait); 4828CHECK_COND(___lwp_cond_wait); 4829 4830CHECK_COND2( _lwp_cond_timedwait); 4831CHECK_COND2( __lwp_cond_timedwait); 4832#undef mutex_t 4833#undef cond_t 4834 4835CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4836CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4837CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 4838CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 4839CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4840CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4841CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4842CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4843 4844 4845// recording machinery: 4846 4847enum { RECORD_SYNCH_LIMIT = 200 }; 4848char* record_synch_name[RECORD_SYNCH_LIMIT]; 4849void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 4850bool record_synch_returning[RECORD_SYNCH_LIMIT]; 4851thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 4852int record_synch_count = 0; 4853bool record_synch_enabled = false; 4854 4855// in dbx, examine recorded data this way: 4856// for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 4857 4858void record_synch(char* name, bool returning) { 4859 if (record_synch_enabled) { 4860 if (record_synch_count < RECORD_SYNCH_LIMIT) { 4861 record_synch_name[record_synch_count] = name; 4862 record_synch_returning[record_synch_count] = returning; 4863 record_synch_thread[record_synch_count] = thr_self(); 4864 record_synch_arg0ptr[record_synch_count] = &name; 4865 record_synch_count++; 4866 } 4867 // put more checking code here: 4868 // ... 4869 } 4870} 4871 4872void record_synch_enable() { 4873 // start collecting trace data, if not already doing so 4874 if (!record_synch_enabled) record_synch_count = 0; 4875 record_synch_enabled = true; 4876} 4877 4878void record_synch_disable() { 4879 // stop collecting trace data 4880 record_synch_enabled = false; 4881} 4882 4883#endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4884#endif // PRODUCT 4885 4886const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4887const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 4888 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4889 4890 4891// JVMTI & JVM monitoring and management support 4892// The thread_cpu_time() and current_thread_cpu_time() are only 4893// supported if is_thread_cpu_time_supported() returns true. 4894// They are not supported on Solaris T1. 4895 4896// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4897// are used by JVM M&M and JVMTI to get user+sys or user CPU time 4898// of a thread. 4899// 4900// current_thread_cpu_time() and thread_cpu_time(Thread *) 4901// returns the fast estimate available on the platform. 4902 4903// hrtime_t gethrvtime() return value includes 4904// user time but does not include system time 4905jlong os::current_thread_cpu_time() { 4906 return (jlong) gethrvtime(); 4907} 4908 4909jlong os::thread_cpu_time(Thread *thread) { 4910 // return user level CPU time only to be consistent with 4911 // what current_thread_cpu_time returns. 4912 // thread_cpu_time_info() must be changed if this changes 4913 return os::thread_cpu_time(thread, false /* user time only */); 4914} 4915 4916jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4917 if (user_sys_cpu_time) { 4918 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4919 } else { 4920 return os::current_thread_cpu_time(); 4921 } 4922} 4923 4924jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 4925 char proc_name[64]; 4926 int count; 4927 prusage_t prusage; 4928 jlong lwp_time; 4929 int fd; 4930 4931 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 4932 getpid(), 4933 thread->osthread()->lwp_id()); 4934 fd = ::open(proc_name, O_RDONLY); 4935 if (fd == -1) return -1; 4936 4937 do { 4938 count = ::pread(fd, 4939 (void *)&prusage.pr_utime, 4940 thr_time_size, 4941 thr_time_off); 4942 } while (count < 0 && errno == EINTR); 4943 ::close(fd); 4944 if (count < 0) return -1; 4945 4946 if (user_sys_cpu_time) { 4947 // user + system CPU time 4948 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 4949 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 4950 (jlong)prusage.pr_stime.tv_nsec + 4951 (jlong)prusage.pr_utime.tv_nsec; 4952 } else { 4953 // user level CPU time only 4954 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 4955 (jlong)prusage.pr_utime.tv_nsec; 4956 } 4957 4958 return (lwp_time); 4959} 4960 4961void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4962 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4963 info_ptr->may_skip_backward = false; // elapsed time not wall time 4964 info_ptr->may_skip_forward = false; // elapsed time not wall time 4965 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4966} 4967 4968void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4969 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4970 info_ptr->may_skip_backward = false; // elapsed time not wall time 4971 info_ptr->may_skip_forward = false; // elapsed time not wall time 4972 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4973} 4974 4975bool os::is_thread_cpu_time_supported() { 4976 return true; 4977} 4978 4979// System loadavg support. Returns -1 if load average cannot be obtained. 4980// Return the load average for our processor set if the primitive exists 4981// (Solaris 9 and later). Otherwise just return system wide loadavg. 4982int os::loadavg(double loadavg[], int nelem) { 4983 if (pset_getloadavg_ptr != NULL) { 4984 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 4985 } else { 4986 return ::getloadavg(loadavg, nelem); 4987 } 4988} 4989 4990//--------------------------------------------------------------------------------- 4991 4992bool os::find(address addr, outputStream* st) { 4993 Dl_info dlinfo; 4994 memset(&dlinfo, 0, sizeof(dlinfo)); 4995 if (dladdr(addr, &dlinfo) != 0) { 4996 st->print(PTR_FORMAT ": ", addr); 4997 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 4998 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 4999 } else if (dlinfo.dli_fbase != NULL) { 5000 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 5001 } else { 5002 st->print("<absolute address>"); 5003 } 5004 if (dlinfo.dli_fname != NULL) { 5005 st->print(" in %s", dlinfo.dli_fname); 5006 } 5007 if (dlinfo.dli_fbase != NULL) { 5008 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 5009 } 5010 st->cr(); 5011 5012 if (Verbose) { 5013 // decode some bytes around the PC 5014 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 5015 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 5016 address lowest = (address) dlinfo.dli_sname; 5017 if (!lowest) lowest = (address) dlinfo.dli_fbase; 5018 if (begin < lowest) begin = lowest; 5019 Dl_info dlinfo2; 5020 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 5021 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 5022 end = (address) dlinfo2.dli_saddr; 5023 } 5024 Disassembler::decode(begin, end, st); 5025 } 5026 return true; 5027 } 5028 return false; 5029} 5030 5031// Following function has been added to support HotSparc's libjvm.so running 5032// under Solaris production JDK 1.2.2 / 1.3.0. These came from 5033// src/solaris/hpi/native_threads in the EVM codebase. 5034// 5035// NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 5036// libraries and should thus be removed. We will leave it behind for a while 5037// until we no longer want to able to run on top of 1.3.0 Solaris production 5038// JDK. See 4341971. 5039 5040#define STACK_SLACK 0x800 5041 5042extern "C" { 5043 intptr_t sysThreadAvailableStackWithSlack() { 5044 stack_t st; 5045 intptr_t retval, stack_top; 5046 retval = thr_stksegment(&st); 5047 assert(retval == 0, "incorrect return value from thr_stksegment"); 5048 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 5049 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 5050 stack_top=(intptr_t)st.ss_sp-st.ss_size; 5051 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 5052 } 5053} 5054 5055// ObjectMonitor park-unpark infrastructure ... 5056// 5057// We implement Solaris and Linux PlatformEvents with the 5058// obvious condvar-mutex-flag triple. 5059// Another alternative that works quite well is pipes: 5060// Each PlatformEvent consists of a pipe-pair. 5061// The thread associated with the PlatformEvent 5062// calls park(), which reads from the input end of the pipe. 5063// Unpark() writes into the other end of the pipe. 5064// The write-side of the pipe must be set NDELAY. 5065// Unfortunately pipes consume a large # of handles. 5066// Native solaris lwp_park() and lwp_unpark() work nicely, too. 5067// Using pipes for the 1st few threads might be workable, however. 5068// 5069// park() is permitted to return spuriously. 5070// Callers of park() should wrap the call to park() in 5071// an appropriate loop. A litmus test for the correct 5072// usage of park is the following: if park() were modified 5073// to immediately return 0 your code should still work, 5074// albeit degenerating to a spin loop. 5075// 5076// In a sense, park()-unpark() just provides more polite spinning 5077// and polling with the key difference over naive spinning being 5078// that a parked thread needs to be explicitly unparked() in order 5079// to wake up and to poll the underlying condition. 5080// 5081// Assumption: 5082// Only one parker can exist on an event, which is why we allocate 5083// them per-thread. Multiple unparkers can coexist. 5084// 5085// _Event transitions in park() 5086// -1 => -1 : illegal 5087// 1 => 0 : pass - return immediately 5088// 0 => -1 : block; then set _Event to 0 before returning 5089// 5090// _Event transitions in unpark() 5091// 0 => 1 : just return 5092// 1 => 1 : just return 5093// -1 => either 0 or 1; must signal target thread 5094// That is, we can safely transition _Event from -1 to either 5095// 0 or 1. 5096// 5097// _Event serves as a restricted-range semaphore. 5098// -1 : thread is blocked, i.e. there is a waiter 5099// 0 : neutral: thread is running or ready, 5100// could have been signaled after a wait started 5101// 1 : signaled - thread is running or ready 5102// 5103// Another possible encoding of _Event would be with 5104// explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5105// 5106// TODO-FIXME: add DTRACE probes for: 5107// 1. Tx parks 5108// 2. Ty unparks Tx 5109// 3. Tx resumes from park 5110 5111 5112// value determined through experimentation 5113#define ROUNDINGFIX 11 5114 5115// utility to compute the abstime argument to timedwait. 5116// TODO-FIXME: switch from compute_abstime() to unpackTime(). 5117 5118static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 5119 // millis is the relative timeout time 5120 // abstime will be the absolute timeout time 5121 if (millis < 0) millis = 0; 5122 struct timeval now; 5123 int status = gettimeofday(&now, NULL); 5124 assert(status == 0, "gettimeofday"); 5125 jlong seconds = millis / 1000; 5126 jlong max_wait_period; 5127 5128 if (UseLWPSynchronization) { 5129 // forward port of fix for 4275818 (not sleeping long enough) 5130 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 5131 // _lwp_cond_timedwait() used a round_down algorithm rather 5132 // than a round_up. For millis less than our roundfactor 5133 // it rounded down to 0 which doesn't meet the spec. 5134 // For millis > roundfactor we may return a bit sooner, but 5135 // since we can not accurately identify the patch level and 5136 // this has already been fixed in Solaris 9 and 8 we will 5137 // leave it alone rather than always rounding down. 5138 5139 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 5140 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 5141 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 5142 max_wait_period = 21000000; 5143 } else { 5144 max_wait_period = 50000000; 5145 } 5146 millis %= 1000; 5147 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 5148 seconds = max_wait_period; 5149 } 5150 abstime->tv_sec = now.tv_sec + seconds; 5151 long usec = now.tv_usec + millis * 1000; 5152 if (usec >= 1000000) { 5153 abstime->tv_sec += 1; 5154 usec -= 1000000; 5155 } 5156 abstime->tv_nsec = usec * 1000; 5157 return abstime; 5158} 5159 5160void os::PlatformEvent::park() { // AKA: down() 5161 // Transitions for _Event: 5162 // -1 => -1 : illegal 5163 // 1 => 0 : pass - return immediately 5164 // 0 => -1 : block; then set _Event to 0 before returning 5165 5166 // Invariant: Only the thread associated with the Event/PlatformEvent 5167 // may call park(). 5168 assert(_nParked == 0, "invariant"); 5169 5170 int v; 5171 for (;;) { 5172 v = _Event; 5173 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5174 } 5175 guarantee(v >= 0, "invariant"); 5176 if (v == 0) { 5177 // Do this the hard way by blocking ... 5178 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5179 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5180 // Only for SPARC >= V8PlusA 5181#if defined(__sparc) && defined(COMPILER2) 5182 if (ClearFPUAtPark) { _mark_fpu_nosave(); } 5183#endif 5184 int status = os::Solaris::mutex_lock(_mutex); 5185 assert_status(status == 0, status, "mutex_lock"); 5186 guarantee(_nParked == 0, "invariant"); 5187 ++_nParked; 5188 while (_Event < 0) { 5189 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 5190 // Treat this the same as if the wait was interrupted 5191 // With usr/lib/lwp going to kernel, always handle ETIME 5192 status = os::Solaris::cond_wait(_cond, _mutex); 5193 if (status == ETIME) status = EINTR; 5194 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 5195 } 5196 --_nParked; 5197 _Event = 0; 5198 status = os::Solaris::mutex_unlock(_mutex); 5199 assert_status(status == 0, status, "mutex_unlock"); 5200 // Paranoia to ensure our locked and lock-free paths interact 5201 // correctly with each other. 5202 OrderAccess::fence(); 5203 } 5204} 5205 5206int os::PlatformEvent::park(jlong millis) { 5207 // Transitions for _Event: 5208 // -1 => -1 : illegal 5209 // 1 => 0 : pass - return immediately 5210 // 0 => -1 : block; then set _Event to 0 before returning 5211 5212 guarantee(_nParked == 0, "invariant"); 5213 int v; 5214 for (;;) { 5215 v = _Event; 5216 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5217 } 5218 guarantee(v >= 0, "invariant"); 5219 if (v != 0) return OS_OK; 5220 5221 int ret = OS_TIMEOUT; 5222 timestruc_t abst; 5223 compute_abstime(&abst, millis); 5224 5225 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5226 // For Solaris SPARC set fprs.FEF=0 prior to parking. 5227 // Only for SPARC >= V8PlusA 5228#if defined(__sparc) && defined(COMPILER2) 5229 if (ClearFPUAtPark) { _mark_fpu_nosave(); } 5230#endif 5231 int status = os::Solaris::mutex_lock(_mutex); 5232 assert_status(status == 0, status, "mutex_lock"); 5233 guarantee(_nParked == 0, "invariant"); 5234 ++_nParked; 5235 while (_Event < 0) { 5236 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 5237 assert_status(status == 0 || status == EINTR || 5238 status == ETIME || status == ETIMEDOUT, 5239 status, "cond_timedwait"); 5240 if (!FilterSpuriousWakeups) break; // previous semantics 5241 if (status == ETIME || status == ETIMEDOUT) break; 5242 // We consume and ignore EINTR and spurious wakeups. 5243 } 5244 --_nParked; 5245 if (_Event >= 0) ret = OS_OK; 5246 _Event = 0; 5247 status = os::Solaris::mutex_unlock(_mutex); 5248 assert_status(status == 0, status, "mutex_unlock"); 5249 // Paranoia to ensure our locked and lock-free paths interact 5250 // correctly with each other. 5251 OrderAccess::fence(); 5252 return ret; 5253} 5254 5255void os::PlatformEvent::unpark() { 5256 // Transitions for _Event: 5257 // 0 => 1 : just return 5258 // 1 => 1 : just return 5259 // -1 => either 0 or 1; must signal target thread 5260 // That is, we can safely transition _Event from -1 to either 5261 // 0 or 1. 5262 // See also: "Semaphores in Plan 9" by Mullender & Cox 5263 // 5264 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5265 // that it will take two back-to-back park() calls for the owning 5266 // thread to block. This has the benefit of forcing a spurious return 5267 // from the first park() call after an unpark() call which will help 5268 // shake out uses of park() and unpark() without condition variables. 5269 5270 if (Atomic::xchg(1, &_Event) >= 0) return; 5271 5272 // If the thread associated with the event was parked, wake it. 5273 // Wait for the thread assoc with the PlatformEvent to vacate. 5274 int status = os::Solaris::mutex_lock(_mutex); 5275 assert_status(status == 0, status, "mutex_lock"); 5276 int AnyWaiters = _nParked; 5277 status = os::Solaris::mutex_unlock(_mutex); 5278 assert_status(status == 0, status, "mutex_unlock"); 5279 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 5280 if (AnyWaiters != 0) { 5281 // Note that we signal() *after* dropping the lock for "immortal" Events. 5282 // This is safe and avoids a common class of futile wakeups. In rare 5283 // circumstances this can cause a thread to return prematurely from 5284 // cond_{timed}wait() but the spurious wakeup is benign and the victim 5285 // will simply re-test the condition and re-park itself. 5286 // This provides particular benefit if the underlying platform does not 5287 // provide wait morphing. 5288 status = os::Solaris::cond_signal(_cond); 5289 assert_status(status == 0, status, "cond_signal"); 5290 } 5291} 5292 5293// JSR166 5294// ------------------------------------------------------- 5295 5296// The solaris and linux implementations of park/unpark are fairly 5297// conservative for now, but can be improved. They currently use a 5298// mutex/condvar pair, plus _counter. 5299// Park decrements _counter if > 0, else does a condvar wait. Unpark 5300// sets count to 1 and signals condvar. Only one thread ever waits 5301// on the condvar. Contention seen when trying to park implies that someone 5302// is unparking you, so don't wait. And spurious returns are fine, so there 5303// is no need to track notifications. 5304 5305#define MAX_SECS 100000000 5306 5307// This code is common to linux and solaris and will be moved to a 5308// common place in dolphin. 5309// 5310// The passed in time value is either a relative time in nanoseconds 5311// or an absolute time in milliseconds. Either way it has to be unpacked 5312// into suitable seconds and nanoseconds components and stored in the 5313// given timespec structure. 5314// Given time is a 64-bit value and the time_t used in the timespec is only 5315// a signed-32-bit value (except on 64-bit Linux) we have to watch for 5316// overflow if times way in the future are given. Further on Solaris versions 5317// prior to 10 there is a restriction (see cond_timedwait) that the specified 5318// number of seconds, in abstime, is less than current_time + 100,000,000. 5319// As it will be 28 years before "now + 100000000" will overflow we can 5320// ignore overflow and just impose a hard-limit on seconds using the value 5321// of "now + 100,000,000". This places a limit on the timeout of about 3.17 5322// years from "now". 5323// 5324static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 5325 assert(time > 0, "convertTime"); 5326 5327 struct timeval now; 5328 int status = gettimeofday(&now, NULL); 5329 assert(status == 0, "gettimeofday"); 5330 5331 time_t max_secs = now.tv_sec + MAX_SECS; 5332 5333 if (isAbsolute) { 5334 jlong secs = time / 1000; 5335 if (secs > max_secs) { 5336 absTime->tv_sec = max_secs; 5337 } else { 5338 absTime->tv_sec = secs; 5339 } 5340 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 5341 } else { 5342 jlong secs = time / NANOSECS_PER_SEC; 5343 if (secs >= MAX_SECS) { 5344 absTime->tv_sec = max_secs; 5345 absTime->tv_nsec = 0; 5346 } else { 5347 absTime->tv_sec = now.tv_sec + secs; 5348 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 5349 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 5350 absTime->tv_nsec -= NANOSECS_PER_SEC; 5351 ++absTime->tv_sec; // note: this must be <= max_secs 5352 } 5353 } 5354 } 5355 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 5356 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 5357 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 5358 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 5359} 5360 5361void Parker::park(bool isAbsolute, jlong time) { 5362 // Ideally we'd do something useful while spinning, such 5363 // as calling unpackTime(). 5364 5365 // Optional fast-path check: 5366 // Return immediately if a permit is available. 5367 // We depend on Atomic::xchg() having full barrier semantics 5368 // since we are doing a lock-free update to _counter. 5369 if (Atomic::xchg(0, &_counter) > 0) return; 5370 5371 // Optional fast-exit: Check interrupt before trying to wait 5372 Thread* thread = Thread::current(); 5373 assert(thread->is_Java_thread(), "Must be JavaThread"); 5374 JavaThread *jt = (JavaThread *)thread; 5375 if (Thread::is_interrupted(thread, false)) { 5376 return; 5377 } 5378 5379 // First, demultiplex/decode time arguments 5380 timespec absTime; 5381 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all 5382 return; 5383 } 5384 if (time > 0) { 5385 // Warning: this code might be exposed to the old Solaris time 5386 // round-down bugs. Grep "roundingFix" for details. 5387 unpackTime(&absTime, isAbsolute, time); 5388 } 5389 5390 // Enter safepoint region 5391 // Beware of deadlocks such as 6317397. 5392 // The per-thread Parker:: _mutex is a classic leaf-lock. 5393 // In particular a thread must never block on the Threads_lock while 5394 // holding the Parker:: mutex. If safepoints are pending both the 5395 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 5396 ThreadBlockInVM tbivm(jt); 5397 5398 // Don't wait if cannot get lock since interference arises from 5399 // unblocking. Also. check interrupt before trying wait 5400 if (Thread::is_interrupted(thread, false) || 5401 os::Solaris::mutex_trylock(_mutex) != 0) { 5402 return; 5403 } 5404 5405 int status; 5406 5407 if (_counter > 0) { // no wait needed 5408 _counter = 0; 5409 status = os::Solaris::mutex_unlock(_mutex); 5410 assert(status == 0, "invariant"); 5411 // Paranoia to ensure our locked and lock-free paths interact 5412 // correctly with each other and Java-level accesses. 5413 OrderAccess::fence(); 5414 return; 5415 } 5416 5417#ifdef ASSERT 5418 // Don't catch signals while blocked; let the running threads have the signals. 5419 // (This allows a debugger to break into the running thread.) 5420 sigset_t oldsigs; 5421 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals(); 5422 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 5423#endif 5424 5425 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5426 jt->set_suspend_equivalent(); 5427 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 5428 5429 // Do this the hard way by blocking ... 5430 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5431 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5432 // Only for SPARC >= V8PlusA 5433#if defined(__sparc) && defined(COMPILER2) 5434 if (ClearFPUAtPark) { _mark_fpu_nosave(); } 5435#endif 5436 5437 if (time == 0) { 5438 status = os::Solaris::cond_wait(_cond, _mutex); 5439 } else { 5440 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 5441 } 5442 // Note that an untimed cond_wait() can sometimes return ETIME on older 5443 // versions of the Solaris. 5444 assert_status(status == 0 || status == EINTR || 5445 status == ETIME || status == ETIMEDOUT, 5446 status, "cond_timedwait"); 5447 5448#ifdef ASSERT 5449 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); 5450#endif 5451 _counter = 0; 5452 status = os::Solaris::mutex_unlock(_mutex); 5453 assert_status(status == 0, status, "mutex_unlock"); 5454 // Paranoia to ensure our locked and lock-free paths interact 5455 // correctly with each other and Java-level accesses. 5456 OrderAccess::fence(); 5457 5458 // If externally suspended while waiting, re-suspend 5459 if (jt->handle_special_suspend_equivalent_condition()) { 5460 jt->java_suspend_self(); 5461 } 5462} 5463 5464void Parker::unpark() { 5465 int status = os::Solaris::mutex_lock(_mutex); 5466 assert(status == 0, "invariant"); 5467 const int s = _counter; 5468 _counter = 1; 5469 status = os::Solaris::mutex_unlock(_mutex); 5470 assert(status == 0, "invariant"); 5471 5472 if (s < 1) { 5473 status = os::Solaris::cond_signal(_cond); 5474 assert(status == 0, "invariant"); 5475 } 5476} 5477 5478extern char** environ; 5479 5480// Run the specified command in a separate process. Return its exit value, 5481// or -1 on failure (e.g. can't fork a new process). 5482// Unlike system(), this function can be called from signal handler. It 5483// doesn't block SIGINT et al. 5484int os::fork_and_exec(char* cmd) { 5485 char * argv[4]; 5486 argv[0] = (char *)"sh"; 5487 argv[1] = (char *)"-c"; 5488 argv[2] = cmd; 5489 argv[3] = NULL; 5490 5491 // fork is async-safe, fork1 is not so can't use in signal handler 5492 pid_t pid; 5493 Thread* t = Thread::current_or_null_safe(); 5494 if (t != NULL && t->is_inside_signal_handler()) { 5495 pid = fork(); 5496 } else { 5497 pid = fork1(); 5498 } 5499 5500 if (pid < 0) { 5501 // fork failed 5502 warning("fork failed: %s", os::strerror(errno)); 5503 return -1; 5504 5505 } else if (pid == 0) { 5506 // child process 5507 5508 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 5509 execve("/usr/bin/sh", argv, environ); 5510 5511 // execve failed 5512 _exit(-1); 5513 5514 } else { 5515 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5516 // care about the actual exit code, for now. 5517 5518 int status; 5519 5520 // Wait for the child process to exit. This returns immediately if 5521 // the child has already exited. */ 5522 while (waitpid(pid, &status, 0) < 0) { 5523 switch (errno) { 5524 case ECHILD: return 0; 5525 case EINTR: break; 5526 default: return -1; 5527 } 5528 } 5529 5530 if (WIFEXITED(status)) { 5531 // The child exited normally; get its exit code. 5532 return WEXITSTATUS(status); 5533 } else if (WIFSIGNALED(status)) { 5534 // The child exited because of a signal 5535 // The best value to return is 0x80 + signal number, 5536 // because that is what all Unix shells do, and because 5537 // it allows callers to distinguish between process exit and 5538 // process death by signal. 5539 return 0x80 + WTERMSIG(status); 5540 } else { 5541 // Unknown exit code; pass it through 5542 return status; 5543 } 5544 } 5545} 5546 5547// is_headless_jre() 5548// 5549// Test for the existence of xawt/libmawt.so or libawt_xawt.so 5550// in order to report if we are running in a headless jre 5551// 5552// Since JDK8 xawt/libmawt.so was moved into the same directory 5553// as libawt.so, and renamed libawt_xawt.so 5554// 5555bool os::is_headless_jre() { 5556 struct stat statbuf; 5557 char buf[MAXPATHLEN]; 5558 char libmawtpath[MAXPATHLEN]; 5559 const char *xawtstr = "/xawt/libmawt.so"; 5560 const char *new_xawtstr = "/libawt_xawt.so"; 5561 char *p; 5562 5563 // Get path to libjvm.so 5564 os::jvm_path(buf, sizeof(buf)); 5565 5566 // Get rid of libjvm.so 5567 p = strrchr(buf, '/'); 5568 if (p == NULL) { 5569 return false; 5570 } else { 5571 *p = '\0'; 5572 } 5573 5574 // Get rid of client or server 5575 p = strrchr(buf, '/'); 5576 if (p == NULL) { 5577 return false; 5578 } else { 5579 *p = '\0'; 5580 } 5581 5582 // check xawt/libmawt.so 5583 strcpy(libmawtpath, buf); 5584 strcat(libmawtpath, xawtstr); 5585 if (::stat(libmawtpath, &statbuf) == 0) return false; 5586 5587 // check libawt_xawt.so 5588 strcpy(libmawtpath, buf); 5589 strcat(libmawtpath, new_xawtstr); 5590 if (::stat(libmawtpath, &statbuf) == 0) return false; 5591 5592 return true; 5593} 5594 5595size_t os::write(int fd, const void *buf, unsigned int nBytes) { 5596 size_t res; 5597 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res); 5598 return res; 5599} 5600 5601int os::close(int fd) { 5602 return ::close(fd); 5603} 5604 5605int os::socket_close(int fd) { 5606 return ::close(fd); 5607} 5608 5609int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5610 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5611 "Assumed _thread_in_native"); 5612 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags)); 5613} 5614 5615int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5616 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5617 "Assumed _thread_in_native"); 5618 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5619} 5620 5621int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5622 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5623} 5624 5625// As both poll and select can be interrupted by signals, we have to be 5626// prepared to restart the system call after updating the timeout, unless 5627// a poll() is done with timeout == -1, in which case we repeat with this 5628// "wait forever" value. 5629 5630int os::connect(int fd, struct sockaddr *him, socklen_t len) { 5631 int _result; 5632 _result = ::connect(fd, him, len); 5633 5634 // On Solaris, when a connect() call is interrupted, the connection 5635 // can be established asynchronously (see 6343810). Subsequent calls 5636 // to connect() must check the errno value which has the semantic 5637 // described below (copied from the connect() man page). Handling 5638 // of asynchronously established connections is required for both 5639 // blocking and non-blocking sockets. 5640 // EINTR The connection attempt was interrupted 5641 // before any data arrived by the delivery of 5642 // a signal. The connection, however, will be 5643 // established asynchronously. 5644 // 5645 // EINPROGRESS The socket is non-blocking, and the connec- 5646 // tion cannot be completed immediately. 5647 // 5648 // EALREADY The socket is non-blocking, and a previous 5649 // connection attempt has not yet been com- 5650 // pleted. 5651 // 5652 // EISCONN The socket is already connected. 5653 if (_result == OS_ERR && errno == EINTR) { 5654 // restarting a connect() changes its errno semantics 5655 RESTARTABLE(::connect(fd, him, len), _result); 5656 // undo these changes 5657 if (_result == OS_ERR) { 5658 if (errno == EALREADY) { 5659 errno = EINPROGRESS; // fall through 5660 } else if (errno == EISCONN) { 5661 errno = 0; 5662 return OS_OK; 5663 } 5664 } 5665 } 5666 return _result; 5667} 5668 5669// Get the default path to the core file 5670// Returns the length of the string 5671int os::get_core_path(char* buffer, size_t bufferSize) { 5672 const char* p = get_current_directory(buffer, bufferSize); 5673 5674 if (p == NULL) { 5675 assert(p != NULL, "failed to get current directory"); 5676 return 0; 5677 } 5678 5679 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 5680 p, current_process_id()); 5681 5682 return strlen(buffer); 5683} 5684 5685#ifndef PRODUCT 5686void TestReserveMemorySpecial_test() { 5687 // No tests available for this platform 5688} 5689#endif 5690 5691bool os::start_debugging(char *buf, int buflen) { 5692 int len = (int)strlen(buf); 5693 char *p = &buf[len]; 5694 5695 jio_snprintf(p, buflen-len, 5696 "\n\n" 5697 "Do you want to debug the problem?\n\n" 5698 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n" 5699 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 5700 "Otherwise, press RETURN to abort...", 5701 os::current_process_id(), os::current_thread_id()); 5702 5703 bool yes = os::message_box("Unexpected Error", buf); 5704 5705 if (yes) { 5706 // yes, user asked VM to launch debugger 5707 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id()); 5708 5709 os::fork_and_exec(buf); 5710 yes = false; 5711 } 5712 return yes; 5713} 5714