os_solaris.cpp revision 11618:1fba59da0199
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 "mutex_solaris.inline.hpp" 39#include "oops/oop.inline.hpp" 40#include "os_share_solaris.hpp" 41#include "os_solaris.inline.hpp" 42#include "prims/jniFastGetField.hpp" 43#include "prims/jvm.h" 44#include "prims/jvm_misc.hpp" 45#include "runtime/arguments.hpp" 46#include "runtime/atomic.inline.hpp" 47#include "runtime/extendedPC.hpp" 48#include "runtime/globals.hpp" 49#include "runtime/interfaceSupport.hpp" 50#include "runtime/java.hpp" 51#include "runtime/javaCalls.hpp" 52#include "runtime/mutexLocker.hpp" 53#include "runtime/objectMonitor.hpp" 54#include "runtime/orderAccess.inline.hpp" 55#include "runtime/osThread.hpp" 56#include "runtime/perfMemory.hpp" 57#include "runtime/sharedRuntime.hpp" 58#include "runtime/statSampler.hpp" 59#include "runtime/stubRoutines.hpp" 60#include "runtime/thread.inline.hpp" 61#include "runtime/threadCritical.hpp" 62#include "runtime/timer.hpp" 63#include "runtime/vm_version.hpp" 64#include "semaphore_posix.hpp" 65#include "services/attachListener.hpp" 66#include "services/memTracker.hpp" 67#include "services/runtimeService.hpp" 68#include "utilities/decoder.hpp" 69#include "utilities/defaultStream.hpp" 70#include "utilities/events.hpp" 71#include "utilities/growableArray.hpp" 72#include "utilities/macros.hpp" 73#include "utilities/vmError.hpp" 74 75// put OS-includes here 76# include <dlfcn.h> 77# include <errno.h> 78# include <exception> 79# include <link.h> 80# include <poll.h> 81# include <pthread.h> 82# include <schedctl.h> 83# include <setjmp.h> 84# include <signal.h> 85# include <stdio.h> 86# include <alloca.h> 87# include <sys/filio.h> 88# include <sys/ipc.h> 89# include <sys/lwp.h> 90# include <sys/machelf.h> // for elf Sym structure used by dladdr1 91# include <sys/mman.h> 92# include <sys/processor.h> 93# include <sys/procset.h> 94# include <sys/pset.h> 95# include <sys/resource.h> 96# include <sys/shm.h> 97# include <sys/socket.h> 98# include <sys/stat.h> 99# include <sys/systeminfo.h> 100# include <sys/time.h> 101# include <sys/times.h> 102# include <sys/types.h> 103# include <sys/wait.h> 104# include <sys/utsname.h> 105# include <thread.h> 106# include <unistd.h> 107# include <sys/priocntl.h> 108# include <sys/rtpriocntl.h> 109# include <sys/tspriocntl.h> 110# include <sys/iapriocntl.h> 111# include <sys/fxpriocntl.h> 112# include <sys/loadavg.h> 113# include <string.h> 114# include <stdio.h> 115 116# define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 117# include <sys/procfs.h> // see comment in <sys/procfs.h> 118 119#define MAX_PATH (2 * K) 120 121// for timer info max values which include all bits 122#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 123 124 125// Here are some liblgrp types from sys/lgrp_user.h to be able to 126// compile on older systems without this header file. 127 128#ifndef MADV_ACCESS_LWP 129 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */ 130#endif 131#ifndef MADV_ACCESS_MANY 132 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */ 133#endif 134 135#ifndef LGRP_RSRC_CPU 136 #define LGRP_RSRC_CPU 0 /* CPU resources */ 137#endif 138#ifndef LGRP_RSRC_MEM 139 #define LGRP_RSRC_MEM 1 /* memory resources */ 140#endif 141 142// Values for ThreadPriorityPolicy == 1 143int prio_policy1[CriticalPriority+1] = { 144 -99999, 0, 16, 32, 48, 64, 145 80, 96, 112, 124, 127, 127 }; 146 147// System parameters used internally 148static clock_t clock_tics_per_sec = 100; 149 150// Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+) 151static bool enabled_extended_FILE_stdio = false; 152 153// For diagnostics to print a message once. see run_periodic_checks 154static bool check_addr0_done = false; 155static sigset_t check_signal_done; 156static bool check_signals = true; 157 158address os::Solaris::handler_start; // start pc of thr_sighndlrinfo 159address os::Solaris::handler_end; // end pc of thr_sighndlrinfo 160 161address os::Solaris::_main_stack_base = NULL; // 4352906 workaround 162 163os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL; 164 165// "default" initializers for missing libc APIs 166extern "C" { 167 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 168 static int lwp_mutex_destroy(mutex_t *mx) { return 0; } 169 170 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 171 static int lwp_cond_destroy(cond_t *cv) { return 0; } 172} 173 174// "default" initializers for pthread-based synchronization 175extern "C" { 176 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 177 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 178} 179 180static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); 181 182static inline size_t adjust_stack_size(address base, size_t size) { 183 if ((ssize_t)size < 0) { 184 // 4759953: Compensate for ridiculous stack size. 185 size = max_intx; 186 } 187 if (size > (size_t)base) { 188 // 4812466: Make sure size doesn't allow the stack to wrap the address space. 189 size = (size_t)base; 190 } 191 return size; 192} 193 194static inline stack_t get_stack_info() { 195 stack_t st; 196 int retval = thr_stksegment(&st); 197 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); 198 assert(retval == 0, "incorrect return value from thr_stksegment"); 199 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 200 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 201 return st; 202} 203 204address os::current_stack_base() { 205 int r = thr_main(); 206 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 207 bool is_primordial_thread = r; 208 209 // Workaround 4352906, avoid calls to thr_stksegment by 210 // thr_main after the first one (it looks like we trash 211 // some data, causing the value for ss_sp to be incorrect). 212 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) { 213 stack_t st = get_stack_info(); 214 if (is_primordial_thread) { 215 // cache initial value of stack base 216 os::Solaris::_main_stack_base = (address)st.ss_sp; 217 } 218 return (address)st.ss_sp; 219 } else { 220 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); 221 return os::Solaris::_main_stack_base; 222 } 223} 224 225size_t os::current_stack_size() { 226 size_t size; 227 228 int r = thr_main(); 229 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 230 if (!r) { 231 size = get_stack_info().ss_size; 232 } else { 233 struct rlimit limits; 234 getrlimit(RLIMIT_STACK, &limits); 235 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); 236 } 237 // base may not be page aligned 238 address base = current_stack_base(); 239 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());; 240 return (size_t)(base - bottom); 241} 242 243struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 244 return localtime_r(clock, res); 245} 246 247void os::Solaris::try_enable_extended_io() { 248 typedef int (*enable_extended_FILE_stdio_t)(int, int); 249 250 if (!UseExtendedFileIO) { 251 return; 252 } 253 254 enable_extended_FILE_stdio_t enabler = 255 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT, 256 "enable_extended_FILE_stdio"); 257 if (enabler) { 258 enabler(-1, -1); 259 } 260} 261 262static int _processors_online = 0; 263 264jint os::Solaris::_os_thread_limit = 0; 265volatile jint os::Solaris::_os_thread_count = 0; 266 267julong os::available_memory() { 268 return Solaris::available_memory(); 269} 270 271julong os::Solaris::available_memory() { 272 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); 273} 274 275julong os::Solaris::_physical_memory = 0; 276 277julong os::physical_memory() { 278 return Solaris::physical_memory(); 279} 280 281static hrtime_t first_hrtime = 0; 282static const hrtime_t hrtime_hz = 1000*1000*1000; 283static volatile hrtime_t max_hrtime = 0; 284 285 286void os::Solaris::initialize_system_info() { 287 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); 288 _processors_online = sysconf(_SC_NPROCESSORS_ONLN); 289 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * 290 (julong)sysconf(_SC_PAGESIZE); 291} 292 293int os::active_processor_count() { 294 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 295 pid_t pid = getpid(); 296 psetid_t pset = PS_NONE; 297 // Are we running in a processor set or is there any processor set around? 298 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) { 299 uint_t pset_cpus; 300 // Query the number of cpus available to us. 301 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) { 302 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check"); 303 _processors_online = pset_cpus; 304 return pset_cpus; 305 } 306 } 307 // Otherwise return number of online cpus 308 return online_cpus; 309} 310 311static bool find_processors_in_pset(psetid_t pset, 312 processorid_t** id_array, 313 uint_t* id_length) { 314 bool result = false; 315 // Find the number of processors in the processor set. 316 if (pset_info(pset, NULL, id_length, NULL) == 0) { 317 // Make up an array to hold their ids. 318 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 319 // Fill in the array with their processor ids. 320 if (pset_info(pset, NULL, id_length, *id_array) == 0) { 321 result = true; 322 } 323 } 324 return result; 325} 326 327// Callers of find_processors_online() must tolerate imprecise results -- 328// the system configuration can change asynchronously because of DR 329// or explicit psradm operations. 330// 331// We also need to take care that the loop (below) terminates as the 332// number of processors online can change between the _SC_NPROCESSORS_ONLN 333// request and the loop that builds the list of processor ids. Unfortunately 334// there's no reliable way to determine the maximum valid processor id, 335// so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online 336// man pages, which claim the processor id set is "sparse, but 337// not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually 338// exit the loop. 339// 340// In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's 341// not available on S8.0. 342 343static bool find_processors_online(processorid_t** id_array, 344 uint* id_length) { 345 const processorid_t MAX_PROCESSOR_ID = 100000; 346 // Find the number of processors online. 347 *id_length = sysconf(_SC_NPROCESSORS_ONLN); 348 // Make up an array to hold their ids. 349 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 350 // Processors need not be numbered consecutively. 351 long found = 0; 352 processorid_t next = 0; 353 while (found < *id_length && next < MAX_PROCESSOR_ID) { 354 processor_info_t info; 355 if (processor_info(next, &info) == 0) { 356 // NB, PI_NOINTR processors are effectively online ... 357 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) { 358 (*id_array)[found] = next; 359 found += 1; 360 } 361 } 362 next += 1; 363 } 364 if (found < *id_length) { 365 // The loop above didn't identify the expected number of processors. 366 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN) 367 // and re-running the loop, above, but there's no guarantee of progress 368 // if the system configuration is in flux. Instead, we just return what 369 // we've got. Note that in the worst case find_processors_online() could 370 // return an empty set. (As a fall-back in the case of the empty set we 371 // could just return the ID of the current processor). 372 *id_length = found; 373 } 374 375 return true; 376} 377 378static bool assign_distribution(processorid_t* id_array, 379 uint id_length, 380 uint* distribution, 381 uint distribution_length) { 382 // We assume we can assign processorid_t's to uint's. 383 assert(sizeof(processorid_t) == sizeof(uint), 384 "can't convert processorid_t to uint"); 385 // Quick check to see if we won't succeed. 386 if (id_length < distribution_length) { 387 return false; 388 } 389 // Assign processor ids to the distribution. 390 // Try to shuffle processors to distribute work across boards, 391 // assuming 4 processors per board. 392 const uint processors_per_board = ProcessDistributionStride; 393 // Find the maximum processor id. 394 processorid_t max_id = 0; 395 for (uint m = 0; m < id_length; m += 1) { 396 max_id = MAX2(max_id, id_array[m]); 397 } 398 // The next id, to limit loops. 399 const processorid_t limit_id = max_id + 1; 400 // Make up markers for available processors. 401 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal); 402 for (uint c = 0; c < limit_id; c += 1) { 403 available_id[c] = false; 404 } 405 for (uint a = 0; a < id_length; a += 1) { 406 available_id[id_array[a]] = true; 407 } 408 // Step by "boards", then by "slot", copying to "assigned". 409 // NEEDS_CLEANUP: The assignment of processors should be stateful, 410 // remembering which processors have been assigned by 411 // previous calls, etc., so as to distribute several 412 // independent calls of this method. What we'd like is 413 // It would be nice to have an API that let us ask 414 // how many processes are bound to a processor, 415 // but we don't have that, either. 416 // In the short term, "board" is static so that 417 // subsequent distributions don't all start at board 0. 418 static uint board = 0; 419 uint assigned = 0; 420 // Until we've found enough processors .... 421 while (assigned < distribution_length) { 422 // ... find the next available processor in the board. 423 for (uint slot = 0; slot < processors_per_board; slot += 1) { 424 uint try_id = board * processors_per_board + slot; 425 if ((try_id < limit_id) && (available_id[try_id] == true)) { 426 distribution[assigned] = try_id; 427 available_id[try_id] = false; 428 assigned += 1; 429 break; 430 } 431 } 432 board += 1; 433 if (board * processors_per_board + 0 >= limit_id) { 434 board = 0; 435 } 436 } 437 if (available_id != NULL) { 438 FREE_C_HEAP_ARRAY(bool, available_id); 439 } 440 return true; 441} 442 443void os::set_native_thread_name(const char *name) { 444 if (Solaris::_pthread_setname_np != NULL) { 445 // Only the first 31 bytes of 'name' are processed by pthread_setname_np 446 // but we explicitly copy into a size-limited buffer to avoid any 447 // possible overflow. 448 char buf[32]; 449 snprintf(buf, sizeof(buf), "%s", name); 450 buf[sizeof(buf) - 1] = '\0'; 451 Solaris::_pthread_setname_np(pthread_self(), buf); 452 } 453} 454 455bool os::distribute_processes(uint length, uint* distribution) { 456 bool result = false; 457 // Find the processor id's of all the available CPUs. 458 processorid_t* id_array = NULL; 459 uint id_length = 0; 460 // There are some races between querying information and using it, 461 // since processor sets can change dynamically. 462 psetid_t pset = PS_NONE; 463 // Are we running in a processor set? 464 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) { 465 result = find_processors_in_pset(pset, &id_array, &id_length); 466 } else { 467 result = find_processors_online(&id_array, &id_length); 468 } 469 if (result == true) { 470 if (id_length >= length) { 471 result = assign_distribution(id_array, id_length, distribution, length); 472 } else { 473 result = false; 474 } 475 } 476 if (id_array != NULL) { 477 FREE_C_HEAP_ARRAY(processorid_t, id_array); 478 } 479 return result; 480} 481 482bool os::bind_to_processor(uint processor_id) { 483 // We assume that a processorid_t can be stored in a uint. 484 assert(sizeof(uint) == sizeof(processorid_t), 485 "can't convert uint to processorid_t"); 486 int bind_result = 487 processor_bind(P_LWPID, // bind LWP. 488 P_MYID, // bind current LWP. 489 (processorid_t) processor_id, // id. 490 NULL); // don't return old binding. 491 return (bind_result == 0); 492} 493 494// Return true if user is running as root. 495 496bool os::have_special_privileges() { 497 static bool init = false; 498 static bool privileges = false; 499 if (!init) { 500 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 501 init = true; 502 } 503 return privileges; 504} 505 506 507void os::init_system_properties_values() { 508 // The next steps are taken in the product version: 509 // 510 // Obtain the JAVA_HOME value from the location of libjvm.so. 511 // This library should be located at: 512 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 513 // 514 // If "/jre/lib/" appears at the right place in the path, then we 515 // assume libjvm.so is installed in a JDK and we use this path. 516 // 517 // Otherwise exit with message: "Could not create the Java virtual machine." 518 // 519 // The following extra steps are taken in the debugging version: 520 // 521 // If "/jre/lib/" does NOT appear at the right place in the path 522 // instead of exit check for $JAVA_HOME environment variable. 523 // 524 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 525 // then we append a fake suffix "hotspot/libjvm.so" to this path so 526 // it looks like libjvm.so is installed there 527 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 528 // 529 // Otherwise exit. 530 // 531 // Important note: if the location of libjvm.so changes this 532 // code needs to be changed accordingly. 533 534// Base path of extensions installed on the system. 535#define SYS_EXT_DIR "/usr/jdk/packages" 536#define EXTENSIONS_DIR "/lib/ext" 537 538 char cpu_arch[12]; 539 // Buffer that fits several sprintfs. 540 // Note that the space for the colon and the trailing null are provided 541 // by the nulls included by the sizeof operator. 542 const size_t bufsize = 543 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends. 544 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch), // invariant ld_library_path 545 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir 546 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 547 548 // sysclasspath, java_home, dll_dir 549 { 550 char *pslash; 551 os::jvm_path(buf, bufsize); 552 553 // Found the full path to libjvm.so. 554 // Now cut the path to <java_home>/jre if we can. 555 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 556 pslash = strrchr(buf, '/'); 557 if (pslash != NULL) { 558 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 559 } 560 Arguments::set_dll_dir(buf); 561 562 if (pslash != NULL) { 563 pslash = strrchr(buf, '/'); 564 if (pslash != NULL) { 565 *pslash = '\0'; // Get rid of /<arch>. 566 pslash = strrchr(buf, '/'); 567 if (pslash != NULL) { 568 *pslash = '\0'; // Get rid of /lib. 569 } 570 } 571 } 572 Arguments::set_java_home(buf); 573 set_boot_path('/', ':'); 574 } 575 576 // Where to look for native libraries. 577 { 578 // Use dlinfo() to determine the correct java.library.path. 579 // 580 // If we're launched by the Java launcher, and the user 581 // does not set java.library.path explicitly on the commandline, 582 // the Java launcher sets LD_LIBRARY_PATH for us and unsets 583 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case 584 // dlinfo returns LD_LIBRARY_PATH + crle settings (including 585 // /usr/lib), which is exactly what we want. 586 // 587 // If the user does set java.library.path, it completely 588 // overwrites this setting, and always has. 589 // 590 // If we're not launched by the Java launcher, we may 591 // get here with any/all of the LD_LIBRARY_PATH[_32|64] 592 // settings. Again, dlinfo does exactly what we want. 593 594 Dl_serinfo info_sz, *info = &info_sz; 595 Dl_serpath *path; 596 char *library_path; 597 char *common_path = buf; 598 599 // Determine search path count and required buffer size. 600 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) { 601 FREE_C_HEAP_ARRAY(char, buf); 602 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror()); 603 } 604 605 // Allocate new buffer and initialize. 606 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal); 607 info->dls_size = info_sz.dls_size; 608 info->dls_cnt = info_sz.dls_cnt; 609 610 // Obtain search path information. 611 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) { 612 FREE_C_HEAP_ARRAY(char, buf); 613 FREE_C_HEAP_ARRAY(char, info); 614 vm_exit_during_initialization("dlinfo SERINFO request", dlerror()); 615 } 616 617 path = &info->dls_serpath[0]; 618 619 // Note: Due to a legacy implementation, most of the library path 620 // is set in the launcher. This was to accomodate linking restrictions 621 // on legacy Solaris implementations (which are no longer supported). 622 // Eventually, all the library path setting will be done here. 623 // 624 // However, to prevent the proliferation of improperly built native 625 // libraries, the new path component /usr/jdk/packages is added here. 626 627 // Determine the actual CPU architecture. 628 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 629#ifdef _LP64 630 // If we are a 64-bit vm, perform the following translations: 631 // sparc -> sparcv9 632 // i386 -> amd64 633 if (strcmp(cpu_arch, "sparc") == 0) { 634 strcat(cpu_arch, "v9"); 635 } else if (strcmp(cpu_arch, "i386") == 0) { 636 strcpy(cpu_arch, "amd64"); 637 } 638#endif 639 640 // Construct the invariant part of ld_library_path. 641 sprintf(common_path, SYS_EXT_DIR "/lib/%s", cpu_arch); 642 643 // Struct size is more than sufficient for the path components obtained 644 // through the dlinfo() call, so only add additional space for the path 645 // components explicitly added here. 646 size_t library_path_size = info->dls_size + strlen(common_path); 647 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal); 648 library_path[0] = '\0'; 649 650 // Construct the desired Java library path from the linker's library 651 // search path. 652 // 653 // For compatibility, it is optimal that we insert the additional path 654 // components specific to the Java VM after those components specified 655 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so 656 // infrastructure. 657 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it. 658 strcpy(library_path, common_path); 659 } else { 660 int inserted = 0; 661 int i; 662 for (i = 0; i < info->dls_cnt; i++, path++) { 663 uint_t flags = path->dls_flags & LA_SER_MASK; 664 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) { 665 strcat(library_path, common_path); 666 strcat(library_path, os::path_separator()); 667 inserted = 1; 668 } 669 strcat(library_path, path->dls_name); 670 strcat(library_path, os::path_separator()); 671 } 672 // Eliminate trailing path separator. 673 library_path[strlen(library_path)-1] = '\0'; 674 } 675 676 // happens before argument parsing - can't use a trace flag 677 // tty->print_raw("init_system_properties_values: native lib path: "); 678 // tty->print_raw_cr(library_path); 679 680 // Callee copies into its own buffer. 681 Arguments::set_library_path(library_path); 682 683 FREE_C_HEAP_ARRAY(char, library_path); 684 FREE_C_HEAP_ARRAY(char, info); 685 } 686 687 // Extensions directories. 688 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); 689 Arguments::set_ext_dirs(buf); 690 691 FREE_C_HEAP_ARRAY(char, buf); 692 693#undef SYS_EXT_DIR 694#undef EXTENSIONS_DIR 695} 696 697void os::breakpoint() { 698 BREAKPOINT; 699} 700 701bool os::obsolete_option(const JavaVMOption *option) { 702 if (!strncmp(option->optionString, "-Xt", 3)) { 703 return true; 704 } else if (!strncmp(option->optionString, "-Xtm", 4)) { 705 return true; 706 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) { 707 return true; 708 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) { 709 return true; 710 } 711 return false; 712} 713 714bool os::Solaris::valid_stack_address(Thread* thread, address sp) { 715 address stackStart = (address)thread->stack_base(); 716 address stackEnd = (address)(stackStart - (address)thread->stack_size()); 717 if (sp < stackStart && sp >= stackEnd) return true; 718 return false; 719} 720 721extern "C" void breakpoint() { 722 // use debugger to set breakpoint here 723} 724 725static thread_t main_thread; 726 727// Thread start routine for all newly created threads 728extern "C" void* thread_native_entry(void* thread_addr) { 729 // Try to randomize the cache line index of hot stack frames. 730 // This helps when threads of the same stack traces evict each other's 731 // cache lines. The threads can be either from the same JVM instance, or 732 // from different JVM instances. The benefit is especially true for 733 // processors with hyperthreading technology. 734 static int counter = 0; 735 int pid = os::current_process_id(); 736 alloca(((pid ^ counter++) & 7) * 128); 737 738 int prio; 739 Thread* thread = (Thread*)thread_addr; 740 741 thread->initialize_thread_current(); 742 743 OSThread* osthr = thread->osthread(); 744 745 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound 746 thread->_schedctl = (void *) schedctl_init(); 747 748 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", 749 os::current_thread_id()); 750 751 if (UseNUMA) { 752 int lgrp_id = os::numa_get_group_id(); 753 if (lgrp_id != -1) { 754 thread->set_lgrp_id(lgrp_id); 755 } 756 } 757 758 // Our priority was set when we were created, and stored in the 759 // osthread, but couldn't be passed through to our LWP until now. 760 // So read back the priority and set it again. 761 762 if (osthr->thread_id() != -1) { 763 if (UseThreadPriorities) { 764 int prio = osthr->native_priority(); 765 if (ThreadPriorityVerbose) { 766 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " 767 INTPTR_FORMAT ", setting priority: %d\n", 768 osthr->thread_id(), osthr->lwp_id(), prio); 769 } 770 os::set_native_priority(thread, prio); 771 } 772 } else if (ThreadPriorityVerbose) { 773 warning("Can't set priority in _start routine, thread id hasn't been set\n"); 774 } 775 776 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 777 778 // initialize signal mask for this thread 779 os::Solaris::hotspot_sigmask(thread); 780 781 thread->run(); 782 783 // One less thread is executing 784 // When the VMThread gets here, the main thread may have already exited 785 // which frees the CodeHeap containing the Atomic::dec code 786 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 787 Atomic::dec(&os::Solaris::_os_thread_count); 788 } 789 790 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id()); 791 792 // If a thread has not deleted itself ("delete this") as part of its 793 // termination sequence, we have to ensure thread-local-storage is 794 // cleared before we actually terminate. No threads should ever be 795 // deleted asynchronously with respect to their termination. 796 if (Thread::current_or_null_safe() != NULL) { 797 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 798 thread->clear_thread_current(); 799 } 800 801 if (UseDetachedThreads) { 802 thr_exit(NULL); 803 ShouldNotReachHere(); 804 } 805 return NULL; 806} 807 808static OSThread* create_os_thread(Thread* thread, thread_t thread_id) { 809 // Allocate the OSThread object 810 OSThread* osthread = new OSThread(NULL, NULL); 811 if (osthread == NULL) return NULL; 812 813 // Store info on the Solaris thread into the OSThread 814 osthread->set_thread_id(thread_id); 815 osthread->set_lwp_id(_lwp_self()); 816 thread->_schedctl = (void *) schedctl_init(); 817 818 if (UseNUMA) { 819 int lgrp_id = os::numa_get_group_id(); 820 if (lgrp_id != -1) { 821 thread->set_lgrp_id(lgrp_id); 822 } 823 } 824 825 if (ThreadPriorityVerbose) { 826 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n", 827 osthread->thread_id(), osthread->lwp_id()); 828 } 829 830 // Initial thread state is INITIALIZED, not SUSPENDED 831 osthread->set_state(INITIALIZED); 832 833 return osthread; 834} 835 836void os::Solaris::hotspot_sigmask(Thread* thread) { 837 //Save caller's signal mask 838 sigset_t sigmask; 839 pthread_sigmask(SIG_SETMASK, NULL, &sigmask); 840 OSThread *osthread = thread->osthread(); 841 osthread->set_caller_sigmask(sigmask); 842 843 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL); 844 if (!ReduceSignalUsage) { 845 if (thread->is_VM_thread()) { 846 // Only the VM thread handles BREAK_SIGNAL ... 847 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 848 } else { 849 // ... all other threads block BREAK_SIGNAL 850 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked"); 851 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 852 } 853 } 854} 855 856bool os::create_attached_thread(JavaThread* thread) { 857#ifdef ASSERT 858 thread->verify_not_published(); 859#endif 860 OSThread* osthread = create_os_thread(thread, thr_self()); 861 if (osthread == NULL) { 862 return false; 863 } 864 865 // Initial thread state is RUNNABLE 866 osthread->set_state(RUNNABLE); 867 thread->set_osthread(osthread); 868 869 // initialize signal mask for this thread 870 // and save the caller's signal mask 871 os::Solaris::hotspot_sigmask(thread); 872 873 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").", 874 os::current_thread_id()); 875 876 return true; 877} 878 879bool os::create_main_thread(JavaThread* thread) { 880#ifdef ASSERT 881 thread->verify_not_published(); 882#endif 883 if (_starting_thread == NULL) { 884 _starting_thread = create_os_thread(thread, main_thread); 885 if (_starting_thread == NULL) { 886 return false; 887 } 888 } 889 890 // The primodial thread is runnable from the start 891 _starting_thread->set_state(RUNNABLE); 892 893 thread->set_osthread(_starting_thread); 894 895 // initialize signal mask for this thread 896 // and save the caller's signal mask 897 os::Solaris::hotspot_sigmask(thread); 898 899 return true; 900} 901 902// Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr() 903static char* describe_thr_create_attributes(char* buf, size_t buflen, 904 size_t stacksize, long flags) { 905 stringStream ss(buf, buflen); 906 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024); 907 ss.print("flags: "); 908 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " "); 909 #define ALL(X) \ 910 X(THR_SUSPENDED) \ 911 X(THR_DETACHED) \ 912 X(THR_BOUND) \ 913 X(THR_NEW_LWP) \ 914 X(THR_DAEMON) 915 ALL(PRINT_FLAG) 916 #undef ALL 917 #undef PRINT_FLAG 918 return buf; 919} 920 921bool os::create_thread(Thread* thread, ThreadType thr_type, 922 size_t stack_size) { 923 // Allocate the OSThread object 924 OSThread* osthread = new OSThread(NULL, NULL); 925 if (osthread == NULL) { 926 return false; 927 } 928 929 if (ThreadPriorityVerbose) { 930 char *thrtyp; 931 switch (thr_type) { 932 case vm_thread: 933 thrtyp = (char *)"vm"; 934 break; 935 case cgc_thread: 936 thrtyp = (char *)"cgc"; 937 break; 938 case pgc_thread: 939 thrtyp = (char *)"pgc"; 940 break; 941 case java_thread: 942 thrtyp = (char *)"java"; 943 break; 944 case compiler_thread: 945 thrtyp = (char *)"compiler"; 946 break; 947 case watcher_thread: 948 thrtyp = (char *)"watcher"; 949 break; 950 default: 951 thrtyp = (char *)"unknown"; 952 break; 953 } 954 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp); 955 } 956 957 // Calculate stack size if it's not specified by caller. 958 if (stack_size == 0) { 959 // The default stack size 1M (2M for LP64). 960 stack_size = (BytesPerWord >> 2) * K * K; 961 962 switch (thr_type) { 963 case os::java_thread: 964 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 965 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create(); 966 break; 967 case os::compiler_thread: 968 if (CompilerThreadStackSize > 0) { 969 stack_size = (size_t)(CompilerThreadStackSize * K); 970 break; 971 } // else fall through: 972 // use VMThreadStackSize if CompilerThreadStackSize is not defined 973 case os::vm_thread: 974 case os::pgc_thread: 975 case os::cgc_thread: 976 case os::watcher_thread: 977 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 978 break; 979 } 980 } 981 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed); 982 983 // Initial state is ALLOCATED but not INITIALIZED 984 osthread->set_state(ALLOCATED); 985 986 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) { 987 // We got lots of threads. Check if we still have some address space left. 988 // Need to be at least 5Mb of unreserved address space. We do check by 989 // trying to reserve some. 990 const size_t VirtualMemoryBangSize = 20*K*K; 991 char* mem = os::reserve_memory(VirtualMemoryBangSize); 992 if (mem == NULL) { 993 delete osthread; 994 return false; 995 } else { 996 // Release the memory again 997 os::release_memory(mem, VirtualMemoryBangSize); 998 } 999 } 1000 1001 // Setup osthread because the child thread may need it. 1002 thread->set_osthread(osthread); 1003 1004 // Create the Solaris thread 1005 thread_t tid = 0; 1006 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED; 1007 int status; 1008 1009 // Mark that we don't have an lwp or thread id yet. 1010 // In case we attempt to set the priority before the thread starts. 1011 osthread->set_lwp_id(-1); 1012 osthread->set_thread_id(-1); 1013 1014 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid); 1015 1016 char buf[64]; 1017 if (status == 0) { 1018 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ", 1019 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 1020 } else { 1021 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.", 1022 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 1023 } 1024 1025 if (status != 0) { 1026 thread->set_osthread(NULL); 1027 // Need to clean up stuff we've allocated so far 1028 delete osthread; 1029 return false; 1030 } 1031 1032 Atomic::inc(&os::Solaris::_os_thread_count); 1033 1034 // Store info on the Solaris thread into the OSThread 1035 osthread->set_thread_id(tid); 1036 1037 // Remember that we created this thread so we can set priority on it 1038 osthread->set_vm_created(); 1039 1040 // Most thread types will set an explicit priority before starting the thread, 1041 // but for those that don't we need a valid value to read back in thread_native_entry. 1042 osthread->set_native_priority(NormPriority); 1043 1044 // Initial thread state is INITIALIZED, not SUSPENDED 1045 osthread->set_state(INITIALIZED); 1046 1047 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 1048 return true; 1049} 1050 1051// defined for >= Solaris 10. This allows builds on earlier versions 1052// of Solaris to take advantage of the newly reserved Solaris JVM signals. 1053// With SIGJVM1, SIGJVM2, ASYNC_SIGNAL is SIGJVM2. Previously INTERRUPT_SIGNAL 1054// was SIGJVM1. 1055// 1056#if !defined(SIGJVM1) 1057 #define SIGJVM1 39 1058 #define SIGJVM2 40 1059#endif 1060 1061debug_only(static bool signal_sets_initialized = false); 1062static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 1063 1064int os::Solaris::_SIGasync = ASYNC_SIGNAL; 1065 1066bool os::Solaris::is_sig_ignored(int sig) { 1067 struct sigaction oact; 1068 sigaction(sig, (struct sigaction*)NULL, &oact); 1069 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 1070 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 1071 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) { 1072 return true; 1073 } else { 1074 return false; 1075 } 1076} 1077 1078// Note: SIGRTMIN is a macro that calls sysconf() so it will 1079// dynamically detect SIGRTMIN value for the system at runtime, not buildtime 1080static bool isJVM1available() { 1081 return SIGJVM1 < SIGRTMIN; 1082} 1083 1084void os::Solaris::signal_sets_init() { 1085 // Should also have an assertion stating we are still single-threaded. 1086 assert(!signal_sets_initialized, "Already initialized"); 1087 // Fill in signals that are necessarily unblocked for all threads in 1088 // the VM. Currently, we unblock the following signals: 1089 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 1090 // by -Xrs (=ReduceSignalUsage)); 1091 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 1092 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 1093 // the dispositions or masks wrt these signals. 1094 // Programs embedding the VM that want to use the above signals for their 1095 // own purposes must, at this time, use the "-Xrs" option to prevent 1096 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 1097 // (See bug 4345157, and other related bugs). 1098 // In reality, though, unblocking these signals is really a nop, since 1099 // these signals are not blocked by default. 1100 sigemptyset(&unblocked_sigs); 1101 sigemptyset(&allowdebug_blocked_sigs); 1102 sigaddset(&unblocked_sigs, SIGILL); 1103 sigaddset(&unblocked_sigs, SIGSEGV); 1104 sigaddset(&unblocked_sigs, SIGBUS); 1105 sigaddset(&unblocked_sigs, SIGFPE); 1106 1107 // Always true on Solaris 10+ 1108 guarantee(isJVM1available(), "SIGJVM1/2 missing!"); 1109 os::Solaris::set_SIGasync(SIGJVM2); 1110 1111 sigaddset(&unblocked_sigs, os::Solaris::SIGasync()); 1112 1113 if (!ReduceSignalUsage) { 1114 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 1115 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 1116 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 1117 } 1118 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 1119 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 1120 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 1121 } 1122 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 1123 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 1124 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 1125 } 1126 } 1127 // Fill in signals that are blocked by all but the VM thread. 1128 sigemptyset(&vm_sigs); 1129 if (!ReduceSignalUsage) { 1130 sigaddset(&vm_sigs, BREAK_SIGNAL); 1131 } 1132 debug_only(signal_sets_initialized = true); 1133 1134 // For diagnostics only used in run_periodic_checks 1135 sigemptyset(&check_signal_done); 1136} 1137 1138// These are signals that are unblocked while a thread is running Java. 1139// (For some reason, they get blocked by default.) 1140sigset_t* os::Solaris::unblocked_signals() { 1141 assert(signal_sets_initialized, "Not initialized"); 1142 return &unblocked_sigs; 1143} 1144 1145// These are the signals that are blocked while a (non-VM) thread is 1146// running Java. Only the VM thread handles these signals. 1147sigset_t* os::Solaris::vm_signals() { 1148 assert(signal_sets_initialized, "Not initialized"); 1149 return &vm_sigs; 1150} 1151 1152// These are signals that are blocked during cond_wait to allow debugger in 1153sigset_t* os::Solaris::allowdebug_blocked_signals() { 1154 assert(signal_sets_initialized, "Not initialized"); 1155 return &allowdebug_blocked_sigs; 1156} 1157 1158 1159void _handle_uncaught_cxx_exception() { 1160 VMError::report_and_die("An uncaught C++ exception"); 1161} 1162 1163 1164// First crack at OS-specific initialization, from inside the new thread. 1165void os::initialize_thread(Thread* thr) { 1166 int r = thr_main(); 1167 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 1168 if (r) { 1169 JavaThread* jt = (JavaThread *)thr; 1170 assert(jt != NULL, "Sanity check"); 1171 size_t stack_size; 1172 address base = jt->stack_base(); 1173 if (Arguments::created_by_java_launcher()) { 1174 // Use 2MB to allow for Solaris 7 64 bit mode. 1175 stack_size = JavaThread::stack_size_at_create() == 0 1176 ? 2048*K : JavaThread::stack_size_at_create(); 1177 1178 // There are rare cases when we may have already used more than 1179 // the basic stack size allotment before this method is invoked. 1180 // Attempt to allow for a normally sized java_stack. 1181 size_t current_stack_offset = (size_t)(base - (address)&stack_size); 1182 stack_size += ReservedSpace::page_align_size_down(current_stack_offset); 1183 } else { 1184 // 6269555: If we were not created by a Java launcher, i.e. if we are 1185 // running embedded in a native application, treat the primordial thread 1186 // as much like a native attached thread as possible. This means using 1187 // the current stack size from thr_stksegment(), unless it is too large 1188 // to reliably setup guard pages. A reasonable max size is 8MB. 1189 size_t current_size = current_stack_size(); 1190 // This should never happen, but just in case.... 1191 if (current_size == 0) current_size = 2 * K * K; 1192 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size; 1193 } 1194 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());; 1195 stack_size = (size_t)(base - bottom); 1196 1197 assert(stack_size > 0, "Stack size calculation problem"); 1198 1199 if (stack_size > jt->stack_size()) { 1200#ifndef PRODUCT 1201 struct rlimit limits; 1202 getrlimit(RLIMIT_STACK, &limits); 1203 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur); 1204 assert(size >= jt->stack_size(), "Stack size problem in main thread"); 1205#endif 1206 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n" 1207 "(Stack sizes are rounded up to a multiple of the system page size.)\n" 1208 "See limit(1) to increase the stack size limit.", 1209 stack_size / K, jt->stack_size() / K); 1210 vm_exit(1); 1211 } 1212 assert(jt->stack_size() >= stack_size, 1213 "Attempt to map more stack than was allocated"); 1214 jt->set_stack_size(stack_size); 1215 } 1216 1217 // With the T2 libthread (T1 is no longer supported) threads are always bound 1218 // and we use stackbanging in all cases. 1219 1220 os::Solaris::init_thread_fpu_state(); 1221 std::set_terminate(_handle_uncaught_cxx_exception); 1222} 1223 1224 1225 1226// Free Solaris resources related to the OSThread 1227void os::free_thread(OSThread* osthread) { 1228 assert(osthread != NULL, "os::free_thread but osthread not set"); 1229 1230 // We are told to free resources of the argument thread, 1231 // but we can only really operate on the current thread. 1232 assert(Thread::current()->osthread() == osthread, 1233 "os::free_thread but not current thread"); 1234 1235 // Restore caller's signal mask 1236 sigset_t sigmask = osthread->caller_sigmask(); 1237 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 1238 1239 delete osthread; 1240} 1241 1242void os::pd_start_thread(Thread* thread) { 1243 int status = thr_continue(thread->osthread()->thread_id()); 1244 assert_status(status == 0, status, "thr_continue failed"); 1245} 1246 1247 1248intx os::current_thread_id() { 1249 return (intx)thr_self(); 1250} 1251 1252static pid_t _initial_pid = 0; 1253 1254int os::current_process_id() { 1255 return (int)(_initial_pid ? _initial_pid : getpid()); 1256} 1257 1258// gethrtime() should be monotonic according to the documentation, 1259// but some virtualized platforms are known to break this guarantee. 1260// getTimeNanos() must be guaranteed not to move backwards, so we 1261// are forced to add a check here. 1262inline hrtime_t getTimeNanos() { 1263 const hrtime_t now = gethrtime(); 1264 const hrtime_t prev = max_hrtime; 1265 if (now <= prev) { 1266 return prev; // same or retrograde time; 1267 } 1268 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev); 1269 assert(obsv >= prev, "invariant"); // Monotonicity 1270 // If the CAS succeeded then we're done and return "now". 1271 // If the CAS failed and the observed value "obsv" is >= now then 1272 // we should return "obsv". If the CAS failed and now > obsv > prv then 1273 // some other thread raced this thread and installed a new value, in which case 1274 // we could either (a) retry the entire operation, (b) retry trying to install now 1275 // or (c) just return obsv. We use (c). No loop is required although in some cases 1276 // we might discard a higher "now" value in deference to a slightly lower but freshly 1277 // installed obsv value. That's entirely benign -- it admits no new orderings compared 1278 // to (a) or (b) -- and greatly reduces coherence traffic. 1279 // We might also condition (c) on the magnitude of the delta between obsv and now. 1280 // Avoiding excessive CAS operations to hot RW locations is critical. 1281 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 1282 return (prev == obsv) ? now : obsv; 1283} 1284 1285// Time since start-up in seconds to a fine granularity. 1286// Used by VMSelfDestructTimer and the MemProfiler. 1287double os::elapsedTime() { 1288 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1289} 1290 1291jlong os::elapsed_counter() { 1292 return (jlong)(getTimeNanos() - first_hrtime); 1293} 1294 1295jlong os::elapsed_frequency() { 1296 return hrtime_hz; 1297} 1298 1299// Return the real, user, and system times in seconds from an 1300// arbitrary fixed point in the past. 1301bool os::getTimesSecs(double* process_real_time, 1302 double* process_user_time, 1303 double* process_system_time) { 1304 struct tms ticks; 1305 clock_t real_ticks = times(&ticks); 1306 1307 if (real_ticks == (clock_t) (-1)) { 1308 return false; 1309 } else { 1310 double ticks_per_second = (double) clock_tics_per_sec; 1311 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1312 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1313 // For consistency return the real time from getTimeNanos() 1314 // converted to seconds. 1315 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); 1316 1317 return true; 1318 } 1319} 1320 1321bool os::supports_vtime() { return true; } 1322bool os::enable_vtime() { return false; } 1323bool os::vtime_enabled() { return false; } 1324 1325double os::elapsedVTime() { 1326 return (double)gethrvtime() / (double)hrtime_hz; 1327} 1328 1329// Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 1330jlong os::javaTimeMillis() { 1331 timeval t; 1332 if (gettimeofday(&t, NULL) == -1) { 1333 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno)); 1334 } 1335 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; 1336} 1337 1338// Must return seconds+nanos since Jan 1 1970. This must use the same 1339// time source as javaTimeMillis and can't use get_nsec_fromepoch as 1340// we need better than 1ms accuracy 1341void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 1342 timeval t; 1343 if (gettimeofday(&t, NULL) == -1) { 1344 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno)); 1345 } 1346 seconds = jlong(t.tv_sec); 1347 nanos = jlong(t.tv_usec) * 1000; 1348} 1349 1350 1351jlong os::javaTimeNanos() { 1352 return (jlong)getTimeNanos(); 1353} 1354 1355void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1356 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits 1357 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1358 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1359 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1360} 1361 1362char * os::local_time_string(char *buf, size_t buflen) { 1363 struct tm t; 1364 time_t long_time; 1365 time(&long_time); 1366 localtime_r(&long_time, &t); 1367 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1368 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1369 t.tm_hour, t.tm_min, t.tm_sec); 1370 return buf; 1371} 1372 1373// Note: os::shutdown() might be called very early during initialization, or 1374// called from signal handler. Before adding something to os::shutdown(), make 1375// sure it is async-safe and can handle partially initialized VM. 1376void os::shutdown() { 1377 1378 // allow PerfMemory to attempt cleanup of any persistent resources 1379 perfMemory_exit(); 1380 1381 // needs to remove object in file system 1382 AttachListener::abort(); 1383 1384 // flush buffered output, finish log files 1385 ostream_abort(); 1386 1387 // Check for abort hook 1388 abort_hook_t abort_hook = Arguments::abort_hook(); 1389 if (abort_hook != NULL) { 1390 abort_hook(); 1391 } 1392} 1393 1394// Note: os::abort() might be called very early during initialization, or 1395// called from signal handler. Before adding something to os::abort(), make 1396// sure it is async-safe and can handle partially initialized VM. 1397void os::abort(bool dump_core, void* siginfo, const void* context) { 1398 os::shutdown(); 1399 if (dump_core) { 1400#ifndef PRODUCT 1401 fdStream out(defaultStream::output_fd()); 1402 out.print_raw("Current thread is "); 1403 char buf[16]; 1404 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1405 out.print_raw_cr(buf); 1406 out.print_raw_cr("Dumping core ..."); 1407#endif 1408 ::abort(); // dump core (for debugging) 1409 } 1410 1411 ::exit(1); 1412} 1413 1414// Die immediately, no exit hook, no abort hook, no cleanup. 1415void os::die() { 1416 ::abort(); // dump core (for debugging) 1417} 1418 1419// DLL functions 1420 1421const char* os::dll_file_extension() { return ".so"; } 1422 1423// This must be hard coded because it's the system's temporary 1424// directory not the java application's temp directory, ala java.io.tmpdir. 1425const char* os::get_temp_directory() { return "/tmp"; } 1426 1427static bool file_exists(const char* filename) { 1428 struct stat statbuf; 1429 if (filename == NULL || strlen(filename) == 0) { 1430 return false; 1431 } 1432 return os::stat(filename, &statbuf) == 0; 1433} 1434 1435bool os::dll_build_name(char* buffer, size_t buflen, 1436 const char* pname, const char* fname) { 1437 bool retval = false; 1438 const size_t pnamelen = pname ? strlen(pname) : 0; 1439 1440 // Return error on buffer overflow. 1441 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { 1442 return retval; 1443 } 1444 1445 if (pnamelen == 0) { 1446 snprintf(buffer, buflen, "lib%s.so", fname); 1447 retval = true; 1448 } else if (strchr(pname, *os::path_separator()) != NULL) { 1449 int n; 1450 char** pelements = split_path(pname, &n); 1451 if (pelements == NULL) { 1452 return false; 1453 } 1454 for (int i = 0; i < n; i++) { 1455 // really shouldn't be NULL but what the heck, check can't hurt 1456 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1457 continue; // skip the empty path values 1458 } 1459 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); 1460 if (file_exists(buffer)) { 1461 retval = true; 1462 break; 1463 } 1464 } 1465 // release the storage 1466 for (int i = 0; i < n; i++) { 1467 if (pelements[i] != NULL) { 1468 FREE_C_HEAP_ARRAY(char, pelements[i]); 1469 } 1470 } 1471 if (pelements != NULL) { 1472 FREE_C_HEAP_ARRAY(char*, pelements); 1473 } 1474 } else { 1475 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); 1476 retval = true; 1477 } 1478 return retval; 1479} 1480 1481// check if addr is inside libjvm.so 1482bool os::address_is_in_vm(address addr) { 1483 static address libjvm_base_addr; 1484 Dl_info dlinfo; 1485 1486 if (libjvm_base_addr == NULL) { 1487 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1488 libjvm_base_addr = (address)dlinfo.dli_fbase; 1489 } 1490 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1491 } 1492 1493 if (dladdr((void *)addr, &dlinfo) != 0) { 1494 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1495 } 1496 1497 return false; 1498} 1499 1500typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int); 1501static dladdr1_func_type dladdr1_func = NULL; 1502 1503bool os::dll_address_to_function_name(address addr, char *buf, 1504 int buflen, int * offset, 1505 bool demangle) { 1506 // buf is not optional, but offset is optional 1507 assert(buf != NULL, "sanity check"); 1508 1509 Dl_info dlinfo; 1510 1511 // dladdr1_func was initialized in os::init() 1512 if (dladdr1_func != NULL) { 1513 // yes, we have dladdr1 1514 1515 // Support for dladdr1 is checked at runtime; it may be 1516 // available even if the vm is built on a machine that does 1517 // not have dladdr1 support. Make sure there is a value for 1518 // RTLD_DL_SYMENT. 1519#ifndef RTLD_DL_SYMENT 1520 #define RTLD_DL_SYMENT 1 1521#endif 1522#ifdef _LP64 1523 Elf64_Sym * info; 1524#else 1525 Elf32_Sym * info; 1526#endif 1527 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1528 RTLD_DL_SYMENT) != 0) { 1529 // see if we have a matching symbol that covers our address 1530 if (dlinfo.dli_saddr != NULL && 1531 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) { 1532 if (dlinfo.dli_sname != NULL) { 1533 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1534 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1535 } 1536 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1537 return true; 1538 } 1539 } 1540 // no matching symbol so try for just file info 1541 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1542 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1543 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1544 return true; 1545 } 1546 } 1547 } 1548 buf[0] = '\0'; 1549 if (offset != NULL) *offset = -1; 1550 return false; 1551 } 1552 1553 // no, only dladdr is available 1554 if (dladdr((void *)addr, &dlinfo) != 0) { 1555 // see if we have a matching symbol 1556 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1557 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1558 jio_snprintf(buf, buflen, dlinfo.dli_sname); 1559 } 1560 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1561 return true; 1562 } 1563 // no matching symbol so try for just file info 1564 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1565 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1566 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1567 return true; 1568 } 1569 } 1570 } 1571 buf[0] = '\0'; 1572 if (offset != NULL) *offset = -1; 1573 return false; 1574} 1575 1576bool os::dll_address_to_library_name(address addr, char* buf, 1577 int buflen, int* offset) { 1578 // buf is not optional, but offset is optional 1579 assert(buf != NULL, "sanity check"); 1580 1581 Dl_info dlinfo; 1582 1583 if (dladdr((void*)addr, &dlinfo) != 0) { 1584 if (dlinfo.dli_fname != NULL) { 1585 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1586 } 1587 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1588 *offset = addr - (address)dlinfo.dli_fbase; 1589 } 1590 return true; 1591 } 1592 1593 buf[0] = '\0'; 1594 if (offset) *offset = -1; 1595 return false; 1596} 1597 1598int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1599 Dl_info dli; 1600 // Sanity check? 1601 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 || 1602 dli.dli_fname == NULL) { 1603 return 1; 1604 } 1605 1606 void * handle = dlopen(dli.dli_fname, RTLD_LAZY); 1607 if (handle == NULL) { 1608 return 1; 1609 } 1610 1611 Link_map *map; 1612 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1613 if (map == NULL) { 1614 dlclose(handle); 1615 return 1; 1616 } 1617 1618 while (map->l_prev != NULL) { 1619 map = map->l_prev; 1620 } 1621 1622 while (map != NULL) { 1623 // Iterate through all map entries and call callback with fields of interest 1624 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1625 dlclose(handle); 1626 return 1; 1627 } 1628 map = map->l_next; 1629 } 1630 1631 dlclose(handle); 1632 return 0; 1633} 1634 1635int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1636 outputStream * out = (outputStream *) param; 1637 out->print_cr(PTR_FORMAT " \t%s", base_address, name); 1638 return 0; 1639} 1640 1641void os::print_dll_info(outputStream * st) { 1642 st->print_cr("Dynamic libraries:"); st->flush(); 1643 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1644 st->print_cr("Error: Cannot print dynamic libraries."); 1645 } 1646} 1647 1648// Loads .dll/.so and 1649// in case of error it checks if .dll/.so was built for the 1650// same architecture as Hotspot is running on 1651 1652void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1653 void * result= ::dlopen(filename, RTLD_LAZY); 1654 if (result != NULL) { 1655 // Successful loading 1656 return result; 1657 } 1658 1659 Elf32_Ehdr elf_head; 1660 1661 // Read system error message into ebuf 1662 // It may or may not be overwritten below 1663 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1664 ebuf[ebuflen-1]='\0'; 1665 int diag_msg_max_length=ebuflen-strlen(ebuf); 1666 char* diag_msg_buf=ebuf+strlen(ebuf); 1667 1668 if (diag_msg_max_length==0) { 1669 // No more space in ebuf for additional diagnostics message 1670 return NULL; 1671 } 1672 1673 1674 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1675 1676 if (file_descriptor < 0) { 1677 // Can't open library, report dlerror() message 1678 return NULL; 1679 } 1680 1681 bool failed_to_read_elf_head= 1682 (sizeof(elf_head)!= 1683 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1684 1685 ::close(file_descriptor); 1686 if (failed_to_read_elf_head) { 1687 // file i/o error - report dlerror() msg 1688 return NULL; 1689 } 1690 1691 typedef struct { 1692 Elf32_Half code; // Actual value as defined in elf.h 1693 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1694 char elf_class; // 32 or 64 bit 1695 char endianess; // MSB or LSB 1696 char* name; // String representation 1697 } arch_t; 1698 1699 static const arch_t arch_array[]={ 1700 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1701 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1702 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1703 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1704 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1705 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1706 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1707 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1708 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1709 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"} 1710 }; 1711 1712#if (defined IA32) 1713 static Elf32_Half running_arch_code=EM_386; 1714#elif (defined AMD64) 1715 static Elf32_Half running_arch_code=EM_X86_64; 1716#elif (defined IA64) 1717 static Elf32_Half running_arch_code=EM_IA_64; 1718#elif (defined __sparc) && (defined _LP64) 1719 static Elf32_Half running_arch_code=EM_SPARCV9; 1720#elif (defined __sparc) && (!defined _LP64) 1721 static Elf32_Half running_arch_code=EM_SPARC; 1722#elif (defined __powerpc64__) 1723 static Elf32_Half running_arch_code=EM_PPC64; 1724#elif (defined __powerpc__) 1725 static Elf32_Half running_arch_code=EM_PPC; 1726#elif (defined ARM) 1727 static Elf32_Half running_arch_code=EM_ARM; 1728#else 1729 #error Method os::dll_load requires that one of following is defined:\ 1730 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM 1731#endif 1732 1733 // Identify compatability class for VM's architecture and library's architecture 1734 // Obtain string descriptions for architectures 1735 1736 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1737 int running_arch_index=-1; 1738 1739 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1740 if (running_arch_code == arch_array[i].code) { 1741 running_arch_index = i; 1742 } 1743 if (lib_arch.code == arch_array[i].code) { 1744 lib_arch.compat_class = arch_array[i].compat_class; 1745 lib_arch.name = arch_array[i].name; 1746 } 1747 } 1748 1749 assert(running_arch_index != -1, 1750 "Didn't find running architecture code (running_arch_code) in arch_array"); 1751 if (running_arch_index == -1) { 1752 // Even though running architecture detection failed 1753 // we may still continue with reporting dlerror() message 1754 return NULL; 1755 } 1756 1757 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1758 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1759 return NULL; 1760 } 1761 1762 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1763 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1764 return NULL; 1765 } 1766 1767 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1768 if (lib_arch.name!=NULL) { 1769 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1770 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1771 lib_arch.name, arch_array[running_arch_index].name); 1772 } else { 1773 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1774 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1775 lib_arch.code, 1776 arch_array[running_arch_index].name); 1777 } 1778 } 1779 1780 return NULL; 1781} 1782 1783void* os::dll_lookup(void* handle, const char* name) { 1784 return dlsym(handle, name); 1785} 1786 1787void* os::get_default_process_handle() { 1788 return (void*)::dlopen(NULL, RTLD_LAZY); 1789} 1790 1791int os::stat(const char *path, struct stat *sbuf) { 1792 char pathbuf[MAX_PATH]; 1793 if (strlen(path) > MAX_PATH - 1) { 1794 errno = ENAMETOOLONG; 1795 return -1; 1796 } 1797 os::native_path(strcpy(pathbuf, path)); 1798 return ::stat(pathbuf, sbuf); 1799} 1800 1801static inline time_t get_mtime(const char* filename) { 1802 struct stat st; 1803 int ret = os::stat(filename, &st); 1804 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 1805 return st.st_mtime; 1806} 1807 1808int os::compare_file_modified_times(const char* file1, const char* file2) { 1809 time_t t1 = get_mtime(file1); 1810 time_t t2 = get_mtime(file2); 1811 return t1 - t2; 1812} 1813 1814static bool _print_ascii_file(const char* filename, outputStream* st) { 1815 int fd = ::open(filename, O_RDONLY); 1816 if (fd == -1) { 1817 return false; 1818 } 1819 1820 char buf[32]; 1821 int bytes; 1822 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1823 st->print_raw(buf, bytes); 1824 } 1825 1826 ::close(fd); 1827 1828 return true; 1829} 1830 1831void os::print_os_info_brief(outputStream* st) { 1832 os::Solaris::print_distro_info(st); 1833 1834 os::Posix::print_uname_info(st); 1835 1836 os::Solaris::print_libversion_info(st); 1837} 1838 1839void os::print_os_info(outputStream* st) { 1840 st->print("OS:"); 1841 1842 os::Solaris::print_distro_info(st); 1843 1844 os::Posix::print_uname_info(st); 1845 1846 os::Solaris::print_libversion_info(st); 1847 1848 os::Posix::print_rlimit_info(st); 1849 1850 os::Posix::print_load_average(st); 1851} 1852 1853void os::Solaris::print_distro_info(outputStream* st) { 1854 if (!_print_ascii_file("/etc/release", st)) { 1855 st->print("Solaris"); 1856 } 1857 st->cr(); 1858} 1859 1860void os::get_summary_os_info(char* buf, size_t buflen) { 1861 strncpy(buf, "Solaris", buflen); // default to plain solaris 1862 FILE* fp = fopen("/etc/release", "r"); 1863 if (fp != NULL) { 1864 char tmp[256]; 1865 // Only get the first line and chop out everything but the os name. 1866 if (fgets(tmp, sizeof(tmp), fp)) { 1867 char* ptr = tmp; 1868 // skip past whitespace characters 1869 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++; 1870 if (*ptr != '\0') { 1871 char* nl = strchr(ptr, '\n'); 1872 if (nl != NULL) *nl = '\0'; 1873 strncpy(buf, ptr, buflen); 1874 } 1875 } 1876 fclose(fp); 1877 } 1878} 1879 1880void os::Solaris::print_libversion_info(outputStream* st) { 1881 st->print(" (T2 libthread)"); 1882 st->cr(); 1883} 1884 1885static bool check_addr0(outputStream* st) { 1886 jboolean status = false; 1887 const int read_chunk = 200; 1888 int ret = 0; 1889 int nmap = 0; 1890 int fd = ::open("/proc/self/map",O_RDONLY); 1891 if (fd >= 0) { 1892 prmap_t *p = NULL; 1893 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t)); 1894 if (NULL == mbuff) { 1895 ::close(fd); 1896 return status; 1897 } 1898 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) { 1899 //check if read() has not read partial data 1900 if( 0 != ret % sizeof(prmap_t)){ 1901 break; 1902 } 1903 nmap = ret / sizeof(prmap_t); 1904 p = (prmap_t *)mbuff; 1905 for(int i = 0; i < nmap; i++){ 1906 if (p->pr_vaddr == 0x0) { 1907 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024); 1908 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname); 1909 st->print("Access: "); 1910 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-"); 1911 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-"); 1912 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-"); 1913 st->cr(); 1914 status = true; 1915 } 1916 p++; 1917 } 1918 } 1919 free(mbuff); 1920 ::close(fd); 1921 } 1922 return status; 1923} 1924 1925void os::get_summary_cpu_info(char* buf, size_t buflen) { 1926 // Get MHz with system call. We don't seem to already have this. 1927 processor_info_t stats; 1928 processorid_t id = getcpuid(); 1929 int clock = 0; 1930 if (processor_info(id, &stats) != -1) { 1931 clock = stats.pi_clock; // pi_processor_type isn't more informative than below 1932 } 1933#ifdef AMD64 1934 snprintf(buf, buflen, "x86 64 bit %d MHz", clock); 1935#else 1936 // must be sparc 1937 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock); 1938#endif 1939} 1940 1941void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1942 // Nothing to do for now. 1943} 1944 1945void os::print_memory_info(outputStream* st) { 1946 st->print("Memory:"); 1947 st->print(" %dk page", os::vm_page_size()>>10); 1948 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 1949 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 1950 st->cr(); 1951 (void) check_addr0(st); 1952} 1953 1954// Moved from whole group, because we need them here for diagnostic 1955// prints. 1956#define OLDMAXSIGNUM 32 1957static int Maxsignum = 0; 1958static int *ourSigFlags = NULL; 1959 1960int os::Solaris::get_our_sigflags(int sig) { 1961 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1962 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1963 return ourSigFlags[sig]; 1964} 1965 1966void os::Solaris::set_our_sigflags(int sig, int flags) { 1967 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1968 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1969 ourSigFlags[sig] = flags; 1970} 1971 1972 1973static const char* get_signal_handler_name(address handler, 1974 char* buf, int buflen) { 1975 int offset; 1976 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 1977 if (found) { 1978 // skip directory names 1979 const char *p1, *p2; 1980 p1 = buf; 1981 size_t len = strlen(os::file_separator()); 1982 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 1983 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 1984 } else { 1985 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 1986 } 1987 return buf; 1988} 1989 1990static void print_signal_handler(outputStream* st, int sig, 1991 char* buf, size_t buflen) { 1992 struct sigaction sa; 1993 1994 sigaction(sig, NULL, &sa); 1995 1996 st->print("%s: ", os::exception_name(sig, buf, buflen)); 1997 1998 address handler = (sa.sa_flags & SA_SIGINFO) 1999 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 2000 : CAST_FROM_FN_PTR(address, sa.sa_handler); 2001 2002 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 2003 st->print("SIG_DFL"); 2004 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 2005 st->print("SIG_IGN"); 2006 } else { 2007 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 2008 } 2009 2010 st->print(", sa_mask[0]="); 2011 os::Posix::print_signal_set_short(st, &sa.sa_mask); 2012 2013 address rh = VMError::get_resetted_sighandler(sig); 2014 // May be, handler was resetted by VMError? 2015 if (rh != NULL) { 2016 handler = rh; 2017 sa.sa_flags = VMError::get_resetted_sigflags(sig); 2018 } 2019 2020 st->print(", sa_flags="); 2021 os::Posix::print_sa_flags(st, sa.sa_flags); 2022 2023 // Check: is it our handler? 2024 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) { 2025 // It is our signal handler 2026 // check for flags 2027 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 2028 st->print( 2029 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 2030 os::Solaris::get_our_sigflags(sig)); 2031 } 2032 } 2033 st->cr(); 2034} 2035 2036void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 2037 st->print_cr("Signal Handlers:"); 2038 print_signal_handler(st, SIGSEGV, buf, buflen); 2039 print_signal_handler(st, SIGBUS , buf, buflen); 2040 print_signal_handler(st, SIGFPE , buf, buflen); 2041 print_signal_handler(st, SIGPIPE, buf, buflen); 2042 print_signal_handler(st, SIGXFSZ, buf, buflen); 2043 print_signal_handler(st, SIGILL , buf, buflen); 2044 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 2045 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 2046 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 2047 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 2048 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 2049 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen); 2050} 2051 2052static char saved_jvm_path[MAXPATHLEN] = { 0 }; 2053 2054// Find the full path to the current module, libjvm.so 2055void os::jvm_path(char *buf, jint buflen) { 2056 // Error checking. 2057 if (buflen < MAXPATHLEN) { 2058 assert(false, "must use a large-enough buffer"); 2059 buf[0] = '\0'; 2060 return; 2061 } 2062 // Lazy resolve the path to current module. 2063 if (saved_jvm_path[0] != 0) { 2064 strcpy(buf, saved_jvm_path); 2065 return; 2066 } 2067 2068 Dl_info dlinfo; 2069 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 2070 assert(ret != 0, "cannot locate libjvm"); 2071 if (ret != 0 && dlinfo.dli_fname != NULL) { 2072 realpath((char *)dlinfo.dli_fname, buf); 2073 } else { 2074 buf[0] = '\0'; 2075 return; 2076 } 2077 2078 if (Arguments::sun_java_launcher_is_altjvm()) { 2079 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 2080 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". 2081 // If "/jre/lib/" appears at the right place in the string, then 2082 // assume we are installed in a JDK and we're done. Otherwise, check 2083 // for a JAVA_HOME environment variable and fix up the path so it 2084 // looks like libjvm.so is installed there (append a fake suffix 2085 // hotspot/libjvm.so). 2086 const char *p = buf + strlen(buf) - 1; 2087 for (int count = 0; p > buf && count < 5; ++count) { 2088 for (--p; p > buf && *p != '/'; --p) 2089 /* empty */ ; 2090 } 2091 2092 if (strncmp(p, "/jre/lib/", 9) != 0) { 2093 // Look for JAVA_HOME in the environment. 2094 char* java_home_var = ::getenv("JAVA_HOME"); 2095 if (java_home_var != NULL && java_home_var[0] != 0) { 2096 char cpu_arch[12]; 2097 char* jrelib_p; 2098 int len; 2099 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 2100#ifdef _LP64 2101 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9. 2102 if (strcmp(cpu_arch, "sparc") == 0) { 2103 strcat(cpu_arch, "v9"); 2104 } else if (strcmp(cpu_arch, "i386") == 0) { 2105 strcpy(cpu_arch, "amd64"); 2106 } 2107#endif 2108 // Check the current module name "libjvm.so". 2109 p = strrchr(buf, '/'); 2110 assert(strstr(p, "/libjvm") == p, "invalid library name"); 2111 2112 realpath(java_home_var, buf); 2113 // determine if this is a legacy image or modules image 2114 // modules image doesn't have "jre" subdirectory 2115 len = strlen(buf); 2116 assert(len < buflen, "Ran out of buffer space"); 2117 jrelib_p = buf + len; 2118 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); 2119 if (0 != access(buf, F_OK)) { 2120 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); 2121 } 2122 2123 if (0 == access(buf, F_OK)) { 2124 // Use current module name "libjvm.so" 2125 len = strlen(buf); 2126 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 2127 } else { 2128 // Go back to path of .so 2129 realpath((char *)dlinfo.dli_fname, buf); 2130 } 2131 } 2132 } 2133 } 2134 2135 strncpy(saved_jvm_path, buf, MAXPATHLEN); 2136 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 2137} 2138 2139 2140void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2141 // no prefix required, not even "_" 2142} 2143 2144 2145void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2146 // no suffix required 2147} 2148 2149// This method is a copy of JDK's sysGetLastErrorString 2150// from src/solaris/hpi/src/system_md.c 2151 2152size_t os::lasterror(char *buf, size_t len) { 2153 if (errno == 0) return 0; 2154 2155 const char *s = os::strerror(errno); 2156 size_t n = ::strlen(s); 2157 if (n >= len) { 2158 n = len - 1; 2159 } 2160 ::strncpy(buf, s, n); 2161 buf[n] = '\0'; 2162 return n; 2163} 2164 2165 2166// sun.misc.Signal 2167 2168extern "C" { 2169 static void UserHandler(int sig, void *siginfo, void *context) { 2170 // Ctrl-C is pressed during error reporting, likely because the error 2171 // handler fails to abort. Let VM die immediately. 2172 if (sig == SIGINT && is_error_reported()) { 2173 os::die(); 2174 } 2175 2176 os::signal_notify(sig); 2177 // We do not need to reinstate the signal handler each time... 2178 } 2179} 2180 2181void* os::user_handler() { 2182 return CAST_FROM_FN_PTR(void*, UserHandler); 2183} 2184 2185struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) { 2186 struct timespec ts; 2187 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 2188 2189 return ts; 2190} 2191 2192extern "C" { 2193 typedef void (*sa_handler_t)(int); 2194 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2195} 2196 2197void* os::signal(int signal_number, void* handler) { 2198 struct sigaction sigAct, oldSigAct; 2199 sigfillset(&(sigAct.sa_mask)); 2200 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 2201 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2202 2203 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 2204 // -1 means registration failed 2205 return (void *)-1; 2206 } 2207 2208 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2209} 2210 2211void os::signal_raise(int signal_number) { 2212 raise(signal_number); 2213} 2214 2215// The following code is moved from os.cpp for making this 2216// code platform specific, which it is by its very nature. 2217 2218// a counter for each possible signal value 2219static int Sigexit = 0; 2220static int Maxlibjsigsigs; 2221static jint *pending_signals = NULL; 2222static int *preinstalled_sigs = NULL; 2223static struct sigaction *chainedsigactions = NULL; 2224static sema_t sig_sem; 2225typedef int (*version_getting_t)(); 2226version_getting_t os::Solaris::get_libjsig_version = NULL; 2227static int libjsigversion = NULL; 2228 2229int os::sigexitnum_pd() { 2230 assert(Sigexit > 0, "signal memory not yet initialized"); 2231 return Sigexit; 2232} 2233 2234void os::Solaris::init_signal_mem() { 2235 // Initialize signal structures 2236 Maxsignum = SIGRTMAX; 2237 Sigexit = Maxsignum+1; 2238 assert(Maxsignum >0, "Unable to obtain max signal number"); 2239 2240 Maxlibjsigsigs = Maxsignum; 2241 2242 // pending_signals has one int per signal 2243 // The additional signal is for SIGEXIT - exit signal to signal_thread 2244 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); 2245 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 2246 2247 if (UseSignalChaining) { 2248 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 2249 * (Maxsignum + 1), mtInternal); 2250 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 2251 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2252 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 2253 } 2254 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2255 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 2256} 2257 2258void os::signal_init_pd() { 2259 int ret; 2260 2261 ret = ::sema_init(&sig_sem, 0, NULL, NULL); 2262 assert(ret == 0, "sema_init() failed"); 2263} 2264 2265void os::signal_notify(int signal_number) { 2266 int ret; 2267 2268 Atomic::inc(&pending_signals[signal_number]); 2269 ret = ::sema_post(&sig_sem); 2270 assert(ret == 0, "sema_post() failed"); 2271} 2272 2273static int check_pending_signals(bool wait_for_signal) { 2274 int ret; 2275 while (true) { 2276 for (int i = 0; i < Sigexit + 1; i++) { 2277 jint n = pending_signals[i]; 2278 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2279 return i; 2280 } 2281 } 2282 if (!wait_for_signal) { 2283 return -1; 2284 } 2285 JavaThread *thread = JavaThread::current(); 2286 ThreadBlockInVM tbivm(thread); 2287 2288 bool threadIsSuspended; 2289 do { 2290 thread->set_suspend_equivalent(); 2291 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2292 while ((ret = ::sema_wait(&sig_sem)) == EINTR) 2293 ; 2294 assert(ret == 0, "sema_wait() failed"); 2295 2296 // were we externally suspended while we were waiting? 2297 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2298 if (threadIsSuspended) { 2299 // The semaphore has been incremented, but while we were waiting 2300 // another thread suspended us. We don't want to continue running 2301 // while suspended because that would surprise the thread that 2302 // suspended us. 2303 ret = ::sema_post(&sig_sem); 2304 assert(ret == 0, "sema_post() failed"); 2305 2306 thread->java_suspend_self(); 2307 } 2308 } while (threadIsSuspended); 2309 } 2310} 2311 2312int os::signal_lookup() { 2313 return check_pending_signals(false); 2314} 2315 2316int os::signal_wait() { 2317 return check_pending_signals(true); 2318} 2319 2320//////////////////////////////////////////////////////////////////////////////// 2321// Virtual Memory 2322 2323static int page_size = -1; 2324 2325// The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will 2326// clear this var if support is not available. 2327static bool has_map_align = true; 2328 2329int os::vm_page_size() { 2330 assert(page_size != -1, "must call os::init"); 2331 return page_size; 2332} 2333 2334// Solaris allocates memory by pages. 2335int os::vm_allocation_granularity() { 2336 assert(page_size != -1, "must call os::init"); 2337 return page_size; 2338} 2339 2340static bool recoverable_mmap_error(int err) { 2341 // See if the error is one we can let the caller handle. This 2342 // list of errno values comes from the Solaris mmap(2) man page. 2343 switch (err) { 2344 case EBADF: 2345 case EINVAL: 2346 case ENOTSUP: 2347 // let the caller deal with these errors 2348 return true; 2349 2350 default: 2351 // Any remaining errors on this OS can cause our reserved mapping 2352 // to be lost. That can cause confusion where different data 2353 // structures think they have the same memory mapped. The worst 2354 // scenario is if both the VM and a library think they have the 2355 // same memory mapped. 2356 return false; 2357 } 2358} 2359 2360static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec, 2361 int err) { 2362 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2363 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec, 2364 os::strerror(err), err); 2365} 2366 2367static void warn_fail_commit_memory(char* addr, size_t bytes, 2368 size_t alignment_hint, bool exec, 2369 int err) { 2370 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2371 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes, 2372 alignment_hint, exec, os::strerror(err), err); 2373} 2374 2375int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) { 2376 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2377 size_t size = bytes; 2378 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2379 if (res != NULL) { 2380 if (UseNUMAInterleaving) { 2381 numa_make_global(addr, bytes); 2382 } 2383 return 0; 2384 } 2385 2386 int err = errno; // save errno from mmap() call in mmap_chunk() 2387 2388 if (!recoverable_mmap_error(err)) { 2389 warn_fail_commit_memory(addr, bytes, exec, err); 2390 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory."); 2391 } 2392 2393 return err; 2394} 2395 2396bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 2397 return Solaris::commit_memory_impl(addr, bytes, exec) == 0; 2398} 2399 2400void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec, 2401 const char* mesg) { 2402 assert(mesg != NULL, "mesg must be specified"); 2403 int err = os::Solaris::commit_memory_impl(addr, bytes, exec); 2404 if (err != 0) { 2405 // the caller wants all commit errors to exit with the specified mesg: 2406 warn_fail_commit_memory(addr, bytes, exec, err); 2407 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2408 } 2409} 2410 2411size_t os::Solaris::page_size_for_alignment(size_t alignment) { 2412 assert(is_size_aligned(alignment, (size_t) vm_page_size()), 2413 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, 2414 alignment, (size_t) vm_page_size()); 2415 2416 for (int i = 0; _page_sizes[i] != 0; i++) { 2417 if (is_size_aligned(alignment, _page_sizes[i])) { 2418 return _page_sizes[i]; 2419 } 2420 } 2421 2422 return (size_t) vm_page_size(); 2423} 2424 2425int os::Solaris::commit_memory_impl(char* addr, size_t bytes, 2426 size_t alignment_hint, bool exec) { 2427 int err = Solaris::commit_memory_impl(addr, bytes, exec); 2428 if (err == 0 && UseLargePages && alignment_hint > 0) { 2429 assert(is_size_aligned(bytes, alignment_hint), 2430 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint); 2431 2432 // The syscall memcntl requires an exact page size (see man memcntl for details). 2433 size_t page_size = page_size_for_alignment(alignment_hint); 2434 if (page_size > (size_t) vm_page_size()) { 2435 (void)Solaris::setup_large_pages(addr, bytes, page_size); 2436 } 2437 } 2438 return err; 2439} 2440 2441bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2442 bool exec) { 2443 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0; 2444} 2445 2446void os::pd_commit_memory_or_exit(char* addr, size_t bytes, 2447 size_t alignment_hint, bool exec, 2448 const char* mesg) { 2449 assert(mesg != NULL, "mesg must be specified"); 2450 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec); 2451 if (err != 0) { 2452 // the caller wants all commit errors to exit with the specified mesg: 2453 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err); 2454 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2455 } 2456} 2457 2458// Uncommit the pages in a specified region. 2459void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { 2460 if (madvise(addr, bytes, MADV_FREE) < 0) { 2461 debug_only(warning("MADV_FREE failed.")); 2462 return; 2463 } 2464} 2465 2466bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2467 return os::commit_memory(addr, size, !ExecMem); 2468} 2469 2470bool os::remove_stack_guard_pages(char* addr, size_t size) { 2471 return os::uncommit_memory(addr, size); 2472} 2473 2474// Change the page size in a given range. 2475void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2476 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2477 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2478 if (UseLargePages) { 2479 size_t page_size = Solaris::page_size_for_alignment(alignment_hint); 2480 if (page_size > (size_t) vm_page_size()) { 2481 Solaris::setup_large_pages(addr, bytes, page_size); 2482 } 2483 } 2484} 2485 2486// Tell the OS to make the range local to the first-touching LWP 2487void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2488 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2489 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2490 debug_only(warning("MADV_ACCESS_LWP failed.")); 2491 } 2492} 2493 2494// Tell the OS that this range would be accessed from different LWPs. 2495void os::numa_make_global(char *addr, size_t bytes) { 2496 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2497 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2498 debug_only(warning("MADV_ACCESS_MANY failed.")); 2499 } 2500} 2501 2502// Get the number of the locality groups. 2503size_t os::numa_get_groups_num() { 2504 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2505 return n != -1 ? n : 1; 2506} 2507 2508// Get a list of leaf locality groups. A leaf lgroup is group that 2509// doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2510// board. An LWP is assigned to one of these groups upon creation. 2511size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2512 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2513 ids[0] = 0; 2514 return 1; 2515 } 2516 int result_size = 0, top = 1, bottom = 0, cur = 0; 2517 for (int k = 0; k < size; k++) { 2518 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2519 (Solaris::lgrp_id_t*)&ids[top], size - top); 2520 if (r == -1) { 2521 ids[0] = 0; 2522 return 1; 2523 } 2524 if (!r) { 2525 // That's a leaf node. 2526 assert(bottom <= cur, "Sanity check"); 2527 // Check if the node has memory 2528 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2529 NULL, 0, LGRP_RSRC_MEM) > 0) { 2530 ids[bottom++] = ids[cur]; 2531 } 2532 } 2533 top += r; 2534 cur++; 2535 } 2536 if (bottom == 0) { 2537 // Handle a situation, when the OS reports no memory available. 2538 // Assume UMA architecture. 2539 ids[0] = 0; 2540 return 1; 2541 } 2542 return bottom; 2543} 2544 2545// Detect the topology change. Typically happens during CPU plugging-unplugging. 2546bool os::numa_topology_changed() { 2547 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2548 if (is_stale != -1 && is_stale) { 2549 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2550 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2551 assert(c != 0, "Failure to initialize LGRP API"); 2552 Solaris::set_lgrp_cookie(c); 2553 return true; 2554 } 2555 return false; 2556} 2557 2558// Get the group id of the current LWP. 2559int os::numa_get_group_id() { 2560 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2561 if (lgrp_id == -1) { 2562 return 0; 2563 } 2564 const int size = os::numa_get_groups_num(); 2565 int *ids = (int*)alloca(size * sizeof(int)); 2566 2567 // Get the ids of all lgroups with memory; r is the count. 2568 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2569 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2570 if (r <= 0) { 2571 return 0; 2572 } 2573 return ids[os::random() % r]; 2574} 2575 2576// Request information about the page. 2577bool os::get_page_info(char *start, page_info* info) { 2578 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2579 uint64_t addr = (uintptr_t)start; 2580 uint64_t outdata[2]; 2581 uint_t validity = 0; 2582 2583 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2584 return false; 2585 } 2586 2587 info->size = 0; 2588 info->lgrp_id = -1; 2589 2590 if ((validity & 1) != 0) { 2591 if ((validity & 2) != 0) { 2592 info->lgrp_id = outdata[0]; 2593 } 2594 if ((validity & 4) != 0) { 2595 info->size = outdata[1]; 2596 } 2597 return true; 2598 } 2599 return false; 2600} 2601 2602// Scan the pages from start to end until a page different than 2603// the one described in the info parameter is encountered. 2604char *os::scan_pages(char *start, char* end, page_info* page_expected, 2605 page_info* page_found) { 2606 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2607 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2608 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1]; 2609 uint_t validity[MAX_MEMINFO_CNT]; 2610 2611 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2612 uint64_t p = (uint64_t)start; 2613 while (p < (uint64_t)end) { 2614 addrs[0] = p; 2615 size_t addrs_count = 1; 2616 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { 2617 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2618 addrs_count++; 2619 } 2620 2621 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2622 return NULL; 2623 } 2624 2625 size_t i = 0; 2626 for (; i < addrs_count; i++) { 2627 if ((validity[i] & 1) != 0) { 2628 if ((validity[i] & 4) != 0) { 2629 if (outdata[types * i + 1] != page_expected->size) { 2630 break; 2631 } 2632 } else if (page_expected->size != 0) { 2633 break; 2634 } 2635 2636 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2637 if (outdata[types * i] != page_expected->lgrp_id) { 2638 break; 2639 } 2640 } 2641 } else { 2642 return NULL; 2643 } 2644 } 2645 2646 if (i < addrs_count) { 2647 if ((validity[i] & 2) != 0) { 2648 page_found->lgrp_id = outdata[types * i]; 2649 } else { 2650 page_found->lgrp_id = -1; 2651 } 2652 if ((validity[i] & 4) != 0) { 2653 page_found->size = outdata[types * i + 1]; 2654 } else { 2655 page_found->size = 0; 2656 } 2657 return (char*)addrs[i]; 2658 } 2659 2660 p = addrs[addrs_count - 1] + page_size; 2661 } 2662 return end; 2663} 2664 2665bool os::pd_uncommit_memory(char* addr, size_t bytes) { 2666 size_t size = bytes; 2667 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2668 // uncommitted page. Otherwise, the read/write might succeed if we 2669 // have enough swap space to back the physical page. 2670 return 2671 NULL != Solaris::mmap_chunk(addr, size, 2672 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2673 PROT_NONE); 2674} 2675 2676char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2677 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2678 2679 if (b == MAP_FAILED) { 2680 return NULL; 2681 } 2682 return b; 2683} 2684 2685char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, 2686 size_t alignment_hint, bool fixed) { 2687 char* addr = requested_addr; 2688 int flags = MAP_PRIVATE | MAP_NORESERVE; 2689 2690 assert(!(fixed && (alignment_hint > 0)), 2691 "alignment hint meaningless with fixed mmap"); 2692 2693 if (fixed) { 2694 flags |= MAP_FIXED; 2695 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) { 2696 flags |= MAP_ALIGN; 2697 addr = (char*) alignment_hint; 2698 } 2699 2700 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2701 // uncommitted page. Otherwise, the read/write might succeed if we 2702 // have enough swap space to back the physical page. 2703 return mmap_chunk(addr, bytes, flags, PROT_NONE); 2704} 2705 2706char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2707 size_t alignment_hint) { 2708 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, 2709 (requested_addr != NULL)); 2710 2711 guarantee(requested_addr == NULL || requested_addr == addr, 2712 "OS failed to return requested mmap address."); 2713 return addr; 2714} 2715 2716// Reserve memory at an arbitrary address, only if that area is 2717// available (and not reserved for something else). 2718 2719char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2720 const int max_tries = 10; 2721 char* base[max_tries]; 2722 size_t size[max_tries]; 2723 2724 // Solaris adds a gap between mmap'ed regions. The size of the gap 2725 // is dependent on the requested size and the MMU. Our initial gap 2726 // value here is just a guess and will be corrected later. 2727 bool had_top_overlap = false; 2728 bool have_adjusted_gap = false; 2729 size_t gap = 0x400000; 2730 2731 // Assert only that the size is a multiple of the page size, since 2732 // that's all that mmap requires, and since that's all we really know 2733 // about at this low abstraction level. If we need higher alignment, 2734 // we can either pass an alignment to this method or verify alignment 2735 // in one of the methods further up the call chain. See bug 5044738. 2736 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2737 2738 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 2739 // Give it a try, if the kernel honors the hint we can return immediately. 2740 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 2741 2742 volatile int err = errno; 2743 if (addr == requested_addr) { 2744 return addr; 2745 } else if (addr != NULL) { 2746 pd_unmap_memory(addr, bytes); 2747 } 2748 2749 if (log_is_enabled(Warning, os)) { 2750 char buf[256]; 2751 buf[0] = '\0'; 2752 if (addr == NULL) { 2753 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err)); 2754 } 2755 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at " 2756 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT 2757 "%s", bytes, requested_addr, addr, buf); 2758 } 2759 2760 // Address hint method didn't work. Fall back to the old method. 2761 // In theory, once SNV becomes our oldest supported platform, this 2762 // code will no longer be needed. 2763 // 2764 // Repeatedly allocate blocks until the block is allocated at the 2765 // right spot. Give up after max_tries. 2766 int i; 2767 for (i = 0; i < max_tries; ++i) { 2768 base[i] = reserve_memory(bytes); 2769 2770 if (base[i] != NULL) { 2771 // Is this the block we wanted? 2772 if (base[i] == requested_addr) { 2773 size[i] = bytes; 2774 break; 2775 } 2776 2777 // check that the gap value is right 2778 if (had_top_overlap && !have_adjusted_gap) { 2779 size_t actual_gap = base[i-1] - base[i] - bytes; 2780 if (gap != actual_gap) { 2781 // adjust the gap value and retry the last 2 allocations 2782 assert(i > 0, "gap adjustment code problem"); 2783 have_adjusted_gap = true; // adjust the gap only once, just in case 2784 gap = actual_gap; 2785 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap); 2786 unmap_memory(base[i], bytes); 2787 unmap_memory(base[i-1], size[i-1]); 2788 i-=2; 2789 continue; 2790 } 2791 } 2792 2793 // Does this overlap the block we wanted? Give back the overlapped 2794 // parts and try again. 2795 // 2796 // There is still a bug in this code: if top_overlap == bytes, 2797 // the overlap is offset from requested region by the value of gap. 2798 // In this case giving back the overlapped part will not work, 2799 // because we'll give back the entire block at base[i] and 2800 // therefore the subsequent allocation will not generate a new gap. 2801 // This could be fixed with a new algorithm that used larger 2802 // or variable size chunks to find the requested region - 2803 // but such a change would introduce additional complications. 2804 // It's rare enough that the planets align for this bug, 2805 // so we'll just wait for a fix for 6204603/5003415 which 2806 // will provide a mmap flag to allow us to avoid this business. 2807 2808 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2809 if (top_overlap >= 0 && top_overlap < bytes) { 2810 had_top_overlap = true; 2811 unmap_memory(base[i], top_overlap); 2812 base[i] += top_overlap; 2813 size[i] = bytes - top_overlap; 2814 } else { 2815 size_t bottom_overlap = base[i] + bytes - requested_addr; 2816 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2817 if (bottom_overlap == 0) { 2818 log_info(os)("attempt_reserve_memory_at: possible alignment bug"); 2819 } 2820 unmap_memory(requested_addr, bottom_overlap); 2821 size[i] = bytes - bottom_overlap; 2822 } else { 2823 size[i] = bytes; 2824 } 2825 } 2826 } 2827 } 2828 2829 // Give back the unused reserved pieces. 2830 2831 for (int j = 0; j < i; ++j) { 2832 if (base[j] != NULL) { 2833 unmap_memory(base[j], size[j]); 2834 } 2835 } 2836 2837 return (i < max_tries) ? requested_addr : NULL; 2838} 2839 2840bool os::pd_release_memory(char* addr, size_t bytes) { 2841 size_t size = bytes; 2842 return munmap(addr, size) == 0; 2843} 2844 2845static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 2846 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()), 2847 "addr must be page aligned"); 2848 int retVal = mprotect(addr, bytes, prot); 2849 return retVal == 0; 2850} 2851 2852// Protect memory (Used to pass readonly pages through 2853// JNI GetArray<type>Elements with empty arrays.) 2854// Also, used for serialization page and for compressed oops null pointer 2855// checking. 2856bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2857 bool is_committed) { 2858 unsigned int p = 0; 2859 switch (prot) { 2860 case MEM_PROT_NONE: p = PROT_NONE; break; 2861 case MEM_PROT_READ: p = PROT_READ; break; 2862 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2863 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2864 default: 2865 ShouldNotReachHere(); 2866 } 2867 // is_committed is unused. 2868 return solaris_mprotect(addr, bytes, p); 2869} 2870 2871// guard_memory and unguard_memory only happens within stack guard pages. 2872// Since ISM pertains only to the heap, guard and unguard memory should not 2873/// happen with an ISM region. 2874bool os::guard_memory(char* addr, size_t bytes) { 2875 return solaris_mprotect(addr, bytes, PROT_NONE); 2876} 2877 2878bool os::unguard_memory(char* addr, size_t bytes) { 2879 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 2880} 2881 2882// Large page support 2883static size_t _large_page_size = 0; 2884 2885// Insertion sort for small arrays (descending order). 2886static void insertion_sort_descending(size_t* array, int len) { 2887 for (int i = 0; i < len; i++) { 2888 size_t val = array[i]; 2889 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 2890 size_t tmp = array[key]; 2891 array[key] = array[key - 1]; 2892 array[key - 1] = tmp; 2893 } 2894 } 2895} 2896 2897bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) { 2898 const unsigned int usable_count = VM_Version::page_size_count(); 2899 if (usable_count == 1) { 2900 return false; 2901 } 2902 2903 // Find the right getpagesizes interface. When solaris 11 is the minimum 2904 // build platform, getpagesizes() (without the '2') can be called directly. 2905 typedef int (*gps_t)(size_t[], int); 2906 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); 2907 if (gps_func == NULL) { 2908 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); 2909 if (gps_func == NULL) { 2910 if (warn) { 2911 warning("MPSS is not supported by the operating system."); 2912 } 2913 return false; 2914 } 2915 } 2916 2917 // Fill the array of page sizes. 2918 int n = (*gps_func)(_page_sizes, page_sizes_max); 2919 assert(n > 0, "Solaris bug?"); 2920 2921 if (n == page_sizes_max) { 2922 // Add a sentinel value (necessary only if the array was completely filled 2923 // since it is static (zeroed at initialization)). 2924 _page_sizes[--n] = 0; 2925 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 2926 } 2927 assert(_page_sizes[n] == 0, "missing sentinel"); 2928 trace_page_sizes("available page sizes", _page_sizes, n); 2929 2930 if (n == 1) return false; // Only one page size available. 2931 2932 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 2933 // select up to usable_count elements. First sort the array, find the first 2934 // acceptable value, then copy the usable sizes to the top of the array and 2935 // trim the rest. Make sure to include the default page size :-). 2936 // 2937 // A better policy could get rid of the 4M limit by taking the sizes of the 2938 // important VM memory regions (java heap and possibly the code cache) into 2939 // account. 2940 insertion_sort_descending(_page_sizes, n); 2941 const size_t size_limit = 2942 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 2943 int beg; 2944 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */; 2945 const int end = MIN2((int)usable_count, n) - 1; 2946 for (int cur = 0; cur < end; ++cur, ++beg) { 2947 _page_sizes[cur] = _page_sizes[beg]; 2948 } 2949 _page_sizes[end] = vm_page_size(); 2950 _page_sizes[end + 1] = 0; 2951 2952 if (_page_sizes[end] > _page_sizes[end - 1]) { 2953 // Default page size is not the smallest; sort again. 2954 insertion_sort_descending(_page_sizes, end + 1); 2955 } 2956 *page_size = _page_sizes[0]; 2957 2958 trace_page_sizes("usable page sizes", _page_sizes, end + 1); 2959 return true; 2960} 2961 2962void os::large_page_init() { 2963 if (UseLargePages) { 2964 // print a warning if any large page related flag is specified on command line 2965 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2966 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2967 2968 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 2969 } 2970} 2971 2972bool os::Solaris::is_valid_page_size(size_t bytes) { 2973 for (int i = 0; _page_sizes[i] != 0; i++) { 2974 if (_page_sizes[i] == bytes) { 2975 return true; 2976 } 2977 } 2978 return false; 2979} 2980 2981bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) { 2982 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align); 2983 assert(is_ptr_aligned((void*) start, align), 2984 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align); 2985 assert(is_size_aligned(bytes, align), 2986 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align); 2987 2988 // Signal to OS that we want large pages for addresses 2989 // from addr, addr + bytes 2990 struct memcntl_mha mpss_struct; 2991 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 2992 mpss_struct.mha_pagesize = align; 2993 mpss_struct.mha_flags = 0; 2994 // Upon successful completion, memcntl() returns 0 2995 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) { 2996 debug_only(warning("Attempt to use MPSS failed.")); 2997 return false; 2998 } 2999 return true; 3000} 3001 3002char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) { 3003 fatal("os::reserve_memory_special should not be called on Solaris."); 3004 return NULL; 3005} 3006 3007bool os::release_memory_special(char* base, size_t bytes) { 3008 fatal("os::release_memory_special should not be called on Solaris."); 3009 return false; 3010} 3011 3012size_t os::large_page_size() { 3013 return _large_page_size; 3014} 3015 3016// MPSS allows application to commit large page memory on demand; with ISM 3017// the entire memory region must be allocated as shared memory. 3018bool os::can_commit_large_page_memory() { 3019 return true; 3020} 3021 3022bool os::can_execute_large_page_memory() { 3023 return true; 3024} 3025 3026// Read calls from inside the vm need to perform state transitions 3027size_t os::read(int fd, void *buf, unsigned int nBytes) { 3028 size_t res; 3029 JavaThread* thread = (JavaThread*)Thread::current(); 3030 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 3031 ThreadBlockInVM tbiv(thread); 3032 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 3033 return res; 3034} 3035 3036size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 3037 size_t res; 3038 JavaThread* thread = (JavaThread*)Thread::current(); 3039 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 3040 ThreadBlockInVM tbiv(thread); 3041 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res); 3042 return res; 3043} 3044 3045size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) { 3046 size_t res; 3047 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 3048 "Assumed _thread_in_native"); 3049 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 3050 return res; 3051} 3052 3053void os::naked_short_sleep(jlong ms) { 3054 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3055 3056 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but 3057 // Solaris requires -lrt for this. 3058 usleep((ms * 1000)); 3059 3060 return; 3061} 3062 3063// Sleep forever; naked call to OS-specific sleep; use with CAUTION 3064void os::infinite_sleep() { 3065 while (true) { // sleep forever ... 3066 ::sleep(100); // ... 100 seconds at a time 3067 } 3068} 3069 3070// Used to convert frequent JVM_Yield() to nops 3071bool os::dont_yield() { 3072 if (DontYieldALot) { 3073 static hrtime_t last_time = 0; 3074 hrtime_t diff = getTimeNanos() - last_time; 3075 3076 if (diff < DontYieldALotInterval * 1000000) { 3077 return true; 3078 } 3079 3080 last_time += diff; 3081 3082 return false; 3083 } else { 3084 return false; 3085 } 3086} 3087 3088// Note that yield semantics are defined by the scheduling class to which 3089// the thread currently belongs. Typically, yield will _not yield to 3090// other equal or higher priority threads that reside on the dispatch queues 3091// of other CPUs. 3092 3093void os::naked_yield() { 3094 thr_yield(); 3095} 3096 3097// Interface for setting lwp priorities. If we are using T2 libthread, 3098// which forces the use of BoundThreads or we manually set UseBoundThreads, 3099// all of our threads will be assigned to real lwp's. Using the thr_setprio 3100// function is meaningless in this mode so we must adjust the real lwp's priority 3101// The routines below implement the getting and setting of lwp priorities. 3102// 3103// Note: T2 is now the only supported libthread. UseBoundThreads flag is 3104// being deprecated and all threads are now BoundThreads 3105// 3106// Note: There are three priority scales used on Solaris. Java priotities 3107// which range from 1 to 10, libthread "thr_setprio" scale which range 3108// from 0 to 127, and the current scheduling class of the process we 3109// are running in. This is typically from -60 to +60. 3110// The setting of the lwp priorities in done after a call to thr_setprio 3111// so Java priorities are mapped to libthread priorities and we map from 3112// the latter to lwp priorities. We don't keep priorities stored in 3113// Java priorities since some of our worker threads want to set priorities 3114// higher than all Java threads. 3115// 3116// For related information: 3117// (1) man -s 2 priocntl 3118// (2) man -s 4 priocntl 3119// (3) man dispadmin 3120// = librt.so 3121// = libthread/common/rtsched.c - thrp_setlwpprio(). 3122// = ps -cL <pid> ... to validate priority. 3123// = sched_get_priority_min and _max 3124// pthread_create 3125// sched_setparam 3126// pthread_setschedparam 3127// 3128// Assumptions: 3129// + We assume that all threads in the process belong to the same 3130// scheduling class. IE. an homogenous process. 3131// + Must be root or in IA group to change change "interactive" attribute. 3132// Priocntl() will fail silently. The only indication of failure is when 3133// we read-back the value and notice that it hasn't changed. 3134// + Interactive threads enter the runq at the head, non-interactive at the tail. 3135// + For RT, change timeslice as well. Invariant: 3136// constant "priority integral" 3137// Konst == TimeSlice * (60-Priority) 3138// Given a priority, compute appropriate timeslice. 3139// + Higher numerical values have higher priority. 3140 3141// sched class attributes 3142typedef struct { 3143 int schedPolicy; // classID 3144 int maxPrio; 3145 int minPrio; 3146} SchedInfo; 3147 3148 3149static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; 3150 3151#ifdef ASSERT 3152static int ReadBackValidate = 1; 3153#endif 3154static int myClass = 0; 3155static int myMin = 0; 3156static int myMax = 0; 3157static int myCur = 0; 3158static bool priocntl_enable = false; 3159 3160static const int criticalPrio = FXCriticalPriority; 3161static int java_MaxPriority_to_os_priority = 0; // Saved mapping 3162 3163 3164// lwp_priocntl_init 3165// 3166// Try to determine the priority scale for our process. 3167// 3168// Return errno or 0 if OK. 3169// 3170static int lwp_priocntl_init() { 3171 int rslt; 3172 pcinfo_t ClassInfo; 3173 pcparms_t ParmInfo; 3174 int i; 3175 3176 if (!UseThreadPriorities) return 0; 3177 3178 // If ThreadPriorityPolicy is 1, switch tables 3179 if (ThreadPriorityPolicy == 1) { 3180 for (i = 0; i < CriticalPriority+1; i++) 3181 os::java_to_os_priority[i] = prio_policy1[i]; 3182 } 3183 if (UseCriticalJavaThreadPriority) { 3184 // MaxPriority always maps to the FX scheduling class and criticalPrio. 3185 // See set_native_priority() and set_lwp_class_and_priority(). 3186 // Save original MaxPriority mapping in case attempt to 3187 // use critical priority fails. 3188 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; 3189 // Set negative to distinguish from other priorities 3190 os::java_to_os_priority[MaxPriority] = -criticalPrio; 3191 } 3192 3193 // Get IDs for a set of well-known scheduling classes. 3194 // TODO-FIXME: GETCLINFO returns the current # of classes in the 3195 // the system. We should have a loop that iterates over the 3196 // classID values, which are known to be "small" integers. 3197 3198 strcpy(ClassInfo.pc_clname, "TS"); 3199 ClassInfo.pc_cid = -1; 3200 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3201 if (rslt < 0) return errno; 3202 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 3203 tsLimits.schedPolicy = ClassInfo.pc_cid; 3204 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 3205 tsLimits.minPrio = -tsLimits.maxPrio; 3206 3207 strcpy(ClassInfo.pc_clname, "IA"); 3208 ClassInfo.pc_cid = -1; 3209 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3210 if (rslt < 0) return errno; 3211 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 3212 iaLimits.schedPolicy = ClassInfo.pc_cid; 3213 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 3214 iaLimits.minPrio = -iaLimits.maxPrio; 3215 3216 strcpy(ClassInfo.pc_clname, "RT"); 3217 ClassInfo.pc_cid = -1; 3218 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3219 if (rslt < 0) return errno; 3220 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 3221 rtLimits.schedPolicy = ClassInfo.pc_cid; 3222 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 3223 rtLimits.minPrio = 0; 3224 3225 strcpy(ClassInfo.pc_clname, "FX"); 3226 ClassInfo.pc_cid = -1; 3227 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3228 if (rslt < 0) return errno; 3229 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); 3230 fxLimits.schedPolicy = ClassInfo.pc_cid; 3231 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; 3232 fxLimits.minPrio = 0; 3233 3234 // Query our "current" scheduling class. 3235 // This will normally be IA, TS or, rarely, FX or RT. 3236 memset(&ParmInfo, 0, sizeof(ParmInfo)); 3237 ParmInfo.pc_cid = PC_CLNULL; 3238 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3239 if (rslt < 0) return errno; 3240 myClass = ParmInfo.pc_cid; 3241 3242 // We now know our scheduling classId, get specific information 3243 // about the class. 3244 ClassInfo.pc_cid = myClass; 3245 ClassInfo.pc_clname[0] = 0; 3246 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); 3247 if (rslt < 0) return errno; 3248 3249 if (ThreadPriorityVerbose) { 3250 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 3251 } 3252 3253 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3254 ParmInfo.pc_cid = PC_CLNULL; 3255 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3256 if (rslt < 0) return errno; 3257 3258 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3259 myMin = rtLimits.minPrio; 3260 myMax = rtLimits.maxPrio; 3261 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3262 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3263 myMin = iaLimits.minPrio; 3264 myMax = iaLimits.maxPrio; 3265 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 3266 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3267 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3268 myMin = tsLimits.minPrio; 3269 myMax = tsLimits.maxPrio; 3270 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 3271 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3272 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3273 myMin = fxLimits.minPrio; 3274 myMax = fxLimits.maxPrio; 3275 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict 3276 } else { 3277 // No clue - punt 3278 if (ThreadPriorityVerbose) { 3279 tty->print_cr("Unknown scheduling class: %s ... \n", 3280 ClassInfo.pc_clname); 3281 } 3282 return EINVAL; // no clue, punt 3283 } 3284 3285 if (ThreadPriorityVerbose) { 3286 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax); 3287 } 3288 3289 priocntl_enable = true; // Enable changing priorities 3290 return 0; 3291} 3292 3293#define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 3294#define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 3295#define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 3296#define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) 3297 3298 3299// scale_to_lwp_priority 3300// 3301// Convert from the libthread "thr_setprio" scale to our current 3302// lwp scheduling class scale. 3303// 3304static int scale_to_lwp_priority(int rMin, int rMax, int x) { 3305 int v; 3306 3307 if (x == 127) return rMax; // avoid round-down 3308 v = (((x*(rMax-rMin)))/128)+rMin; 3309 return v; 3310} 3311 3312 3313// set_lwp_class_and_priority 3314int set_lwp_class_and_priority(int ThreadID, int lwpid, 3315 int newPrio, int new_class, bool scale) { 3316 int rslt; 3317 int Actual, Expected, prv; 3318 pcparms_t ParmInfo; // for GET-SET 3319#ifdef ASSERT 3320 pcparms_t ReadBack; // for readback 3321#endif 3322 3323 // Set priority via PC_GETPARMS, update, PC_SETPARMS 3324 // Query current values. 3325 // TODO: accelerate this by eliminating the PC_GETPARMS call. 3326 // Cache "pcparms_t" in global ParmCache. 3327 // TODO: elide set-to-same-value 3328 3329 // If something went wrong on init, don't change priorities. 3330 if (!priocntl_enable) { 3331 if (ThreadPriorityVerbose) { 3332 tty->print_cr("Trying to set priority but init failed, ignoring"); 3333 } 3334 return EINVAL; 3335 } 3336 3337 // If lwp hasn't started yet, just return 3338 // the _start routine will call us again. 3339 if (lwpid <= 0) { 3340 if (ThreadPriorityVerbose) { 3341 tty->print_cr("deferring the set_lwp_class_and_priority of thread " 3342 INTPTR_FORMAT " to %d, lwpid not set", 3343 ThreadID, newPrio); 3344 } 3345 return 0; 3346 } 3347 3348 if (ThreadPriorityVerbose) { 3349 tty->print_cr ("set_lwp_class_and_priority(" 3350 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 3351 ThreadID, lwpid, newPrio); 3352 } 3353 3354 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3355 ParmInfo.pc_cid = PC_CLNULL; 3356 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 3357 if (rslt < 0) return errno; 3358 3359 int cur_class = ParmInfo.pc_cid; 3360 ParmInfo.pc_cid = (id_t)new_class; 3361 3362 if (new_class == rtLimits.schedPolicy) { 3363 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 3364 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, 3365 rtLimits.maxPrio, newPrio) 3366 : newPrio; 3367 rtInfo->rt_tqsecs = RT_NOCHANGE; 3368 rtInfo->rt_tqnsecs = RT_NOCHANGE; 3369 if (ThreadPriorityVerbose) { 3370 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 3371 } 3372 } else if (new_class == iaLimits.schedPolicy) { 3373 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3374 int maxClamped = MIN2(iaLimits.maxPrio, 3375 cur_class == new_class 3376 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); 3377 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, 3378 maxClamped, newPrio) 3379 : newPrio; 3380 iaInfo->ia_uprilim = cur_class == new_class 3381 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; 3382 iaInfo->ia_mode = IA_NOCHANGE; 3383 if (ThreadPriorityVerbose) { 3384 tty->print_cr("IA: [%d...%d] %d->%d\n", 3385 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 3386 } 3387 } else if (new_class == tsLimits.schedPolicy) { 3388 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3389 int maxClamped = MIN2(tsLimits.maxPrio, 3390 cur_class == new_class 3391 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); 3392 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, 3393 maxClamped, newPrio) 3394 : newPrio; 3395 tsInfo->ts_uprilim = cur_class == new_class 3396 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; 3397 if (ThreadPriorityVerbose) { 3398 tty->print_cr("TS: [%d...%d] %d->%d\n", 3399 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 3400 } 3401 } else if (new_class == fxLimits.schedPolicy) { 3402 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3403 int maxClamped = MIN2(fxLimits.maxPrio, 3404 cur_class == new_class 3405 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); 3406 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, 3407 maxClamped, newPrio) 3408 : newPrio; 3409 fxInfo->fx_uprilim = cur_class == new_class 3410 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; 3411 fxInfo->fx_tqsecs = FX_NOCHANGE; 3412 fxInfo->fx_tqnsecs = FX_NOCHANGE; 3413 if (ThreadPriorityVerbose) { 3414 tty->print_cr("FX: [%d...%d] %d->%d\n", 3415 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); 3416 } 3417 } else { 3418 if (ThreadPriorityVerbose) { 3419 tty->print_cr("Unknown new scheduling class %d\n", new_class); 3420 } 3421 return EINVAL; // no clue, punt 3422 } 3423 3424 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 3425 if (ThreadPriorityVerbose && rslt) { 3426 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 3427 } 3428 if (rslt < 0) return errno; 3429 3430#ifdef ASSERT 3431 // Sanity check: read back what we just attempted to set. 3432 // In theory it could have changed in the interim ... 3433 // 3434 // The priocntl system call is tricky. 3435 // Sometimes it'll validate the priority value argument and 3436 // return EINVAL if unhappy. At other times it fails silently. 3437 // Readbacks are prudent. 3438 3439 if (!ReadBackValidate) return 0; 3440 3441 memset(&ReadBack, 0, sizeof(pcparms_t)); 3442 ReadBack.pc_cid = PC_CLNULL; 3443 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 3444 assert(rslt >= 0, "priocntl failed"); 3445 Actual = Expected = 0xBAD; 3446 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3447 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3448 Actual = RTPRI(ReadBack)->rt_pri; 3449 Expected = RTPRI(ParmInfo)->rt_pri; 3450 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3451 Actual = IAPRI(ReadBack)->ia_upri; 3452 Expected = IAPRI(ParmInfo)->ia_upri; 3453 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3454 Actual = TSPRI(ReadBack)->ts_upri; 3455 Expected = TSPRI(ParmInfo)->ts_upri; 3456 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3457 Actual = FXPRI(ReadBack)->fx_upri; 3458 Expected = FXPRI(ParmInfo)->fx_upri; 3459 } else { 3460 if (ThreadPriorityVerbose) { 3461 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", 3462 ParmInfo.pc_cid); 3463 } 3464 } 3465 3466 if (Actual != Expected) { 3467 if (ThreadPriorityVerbose) { 3468 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 3469 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 3470 } 3471 } 3472#endif 3473 3474 return 0; 3475} 3476 3477// Solaris only gives access to 128 real priorities at a time, 3478// so we expand Java's ten to fill this range. This would be better 3479// if we dynamically adjusted relative priorities. 3480// 3481// The ThreadPriorityPolicy option allows us to select 2 different 3482// priority scales. 3483// 3484// ThreadPriorityPolicy=0 3485// Since the Solaris' default priority is MaximumPriority, we do not 3486// set a priority lower than Max unless a priority lower than 3487// NormPriority is requested. 3488// 3489// ThreadPriorityPolicy=1 3490// This mode causes the priority table to get filled with 3491// linear values. NormPriority get's mapped to 50% of the 3492// Maximum priority an so on. This will cause VM threads 3493// to get unfair treatment against other Solaris processes 3494// which do not explicitly alter their thread priorities. 3495 3496int os::java_to_os_priority[CriticalPriority + 1] = { 3497 -99999, // 0 Entry should never be used 3498 3499 0, // 1 MinPriority 3500 32, // 2 3501 64, // 3 3502 3503 96, // 4 3504 127, // 5 NormPriority 3505 127, // 6 3506 3507 127, // 7 3508 127, // 8 3509 127, // 9 NearMaxPriority 3510 3511 127, // 10 MaxPriority 3512 3513 -criticalPrio // 11 CriticalPriority 3514}; 3515 3516OSReturn os::set_native_priority(Thread* thread, int newpri) { 3517 OSThread* osthread = thread->osthread(); 3518 3519 // Save requested priority in case the thread hasn't been started 3520 osthread->set_native_priority(newpri); 3521 3522 // Check for critical priority request 3523 bool fxcritical = false; 3524 if (newpri == -criticalPrio) { 3525 fxcritical = true; 3526 newpri = criticalPrio; 3527 } 3528 3529 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 3530 if (!UseThreadPriorities) return OS_OK; 3531 3532 int status = 0; 3533 3534 if (!fxcritical) { 3535 // Use thr_setprio only if we have a priority that thr_setprio understands 3536 status = thr_setprio(thread->osthread()->thread_id(), newpri); 3537 } 3538 3539 int lwp_status = 3540 set_lwp_class_and_priority(osthread->thread_id(), 3541 osthread->lwp_id(), 3542 newpri, 3543 fxcritical ? fxLimits.schedPolicy : myClass, 3544 !fxcritical); 3545 if (lwp_status != 0 && fxcritical) { 3546 // Try again, this time without changing the scheduling class 3547 newpri = java_MaxPriority_to_os_priority; 3548 lwp_status = set_lwp_class_and_priority(osthread->thread_id(), 3549 osthread->lwp_id(), 3550 newpri, myClass, false); 3551 } 3552 status |= lwp_status; 3553 return (status == 0) ? OS_OK : OS_ERR; 3554} 3555 3556 3557OSReturn os::get_native_priority(const Thread* const thread, 3558 int *priority_ptr) { 3559 int p; 3560 if (!UseThreadPriorities) { 3561 *priority_ptr = NormalPriority; 3562 return OS_OK; 3563 } 3564 int status = thr_getprio(thread->osthread()->thread_id(), &p); 3565 if (status != 0) { 3566 return OS_ERR; 3567 } 3568 *priority_ptr = p; 3569 return OS_OK; 3570} 3571 3572 3573// Hint to the underlying OS that a task switch would not be good. 3574// Void return because it's a hint and can fail. 3575void os::hint_no_preempt() { 3576 schedctl_start(schedctl_init()); 3577} 3578 3579static void resume_clear_context(OSThread *osthread) { 3580 osthread->set_ucontext(NULL); 3581} 3582 3583static void suspend_save_context(OSThread *osthread, ucontext_t* context) { 3584 osthread->set_ucontext(context); 3585} 3586 3587static PosixSemaphore sr_semaphore; 3588 3589void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) { 3590 // Save and restore errno to avoid confusing native code with EINTR 3591 // after sigsuspend. 3592 int old_errno = errno; 3593 3594 OSThread* osthread = thread->osthread(); 3595 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 3596 3597 os::SuspendResume::State current = osthread->sr.state(); 3598 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 3599 suspend_save_context(osthread, uc); 3600 3601 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 3602 os::SuspendResume::State state = osthread->sr.suspended(); 3603 if (state == os::SuspendResume::SR_SUSPENDED) { 3604 sigset_t suspend_set; // signals for sigsuspend() 3605 3606 // get current set of blocked signals and unblock resume signal 3607 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 3608 sigdelset(&suspend_set, os::Solaris::SIGasync()); 3609 3610 sr_semaphore.signal(); 3611 // wait here until we are resumed 3612 while (1) { 3613 sigsuspend(&suspend_set); 3614 3615 os::SuspendResume::State result = osthread->sr.running(); 3616 if (result == os::SuspendResume::SR_RUNNING) { 3617 sr_semaphore.signal(); 3618 break; 3619 } 3620 } 3621 3622 } else if (state == os::SuspendResume::SR_RUNNING) { 3623 // request was cancelled, continue 3624 } else { 3625 ShouldNotReachHere(); 3626 } 3627 3628 resume_clear_context(osthread); 3629 } else if (current == os::SuspendResume::SR_RUNNING) { 3630 // request was cancelled, continue 3631 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 3632 // ignore 3633 } else { 3634 // ignore 3635 } 3636 3637 errno = old_errno; 3638} 3639 3640void os::print_statistics() { 3641} 3642 3643bool os::message_box(const char* title, const char* message) { 3644 int i; 3645 fdStream err(defaultStream::error_fd()); 3646 for (i = 0; i < 78; i++) err.print_raw("="); 3647 err.cr(); 3648 err.print_raw_cr(title); 3649 for (i = 0; i < 78; i++) err.print_raw("-"); 3650 err.cr(); 3651 err.print_raw_cr(message); 3652 for (i = 0; i < 78; i++) err.print_raw("="); 3653 err.cr(); 3654 3655 char buf[16]; 3656 // Prevent process from exiting upon "read error" without consuming all CPU 3657 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3658 3659 return buf[0] == 'y' || buf[0] == 'Y'; 3660} 3661 3662static int sr_notify(OSThread* osthread) { 3663 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync()); 3664 assert_status(status == 0, status, "thr_kill"); 3665 return status; 3666} 3667 3668// "Randomly" selected value for how long we want to spin 3669// before bailing out on suspending a thread, also how often 3670// we send a signal to a thread we want to resume 3671static const int RANDOMLY_LARGE_INTEGER = 1000000; 3672static const int RANDOMLY_LARGE_INTEGER2 = 100; 3673 3674static bool do_suspend(OSThread* osthread) { 3675 assert(osthread->sr.is_running(), "thread should be running"); 3676 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 3677 3678 // mark as suspended and send signal 3679 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 3680 // failed to switch, state wasn't running? 3681 ShouldNotReachHere(); 3682 return false; 3683 } 3684 3685 if (sr_notify(osthread) != 0) { 3686 ShouldNotReachHere(); 3687 } 3688 3689 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 3690 while (true) { 3691 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) { 3692 break; 3693 } else { 3694 // timeout 3695 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 3696 if (cancelled == os::SuspendResume::SR_RUNNING) { 3697 return false; 3698 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 3699 // make sure that we consume the signal on the semaphore as well 3700 sr_semaphore.wait(); 3701 break; 3702 } else { 3703 ShouldNotReachHere(); 3704 return false; 3705 } 3706 } 3707 } 3708 3709 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 3710 return true; 3711} 3712 3713static void do_resume(OSThread* osthread) { 3714 assert(osthread->sr.is_suspended(), "thread should be suspended"); 3715 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 3716 3717 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 3718 // failed to switch to WAKEUP_REQUEST 3719 ShouldNotReachHere(); 3720 return; 3721 } 3722 3723 while (true) { 3724 if (sr_notify(osthread) == 0) { 3725 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 3726 if (osthread->sr.is_running()) { 3727 return; 3728 } 3729 } 3730 } else { 3731 ShouldNotReachHere(); 3732 } 3733 } 3734 3735 guarantee(osthread->sr.is_running(), "Must be running!"); 3736} 3737 3738void os::SuspendedThreadTask::internal_do_task() { 3739 if (do_suspend(_thread->osthread())) { 3740 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3741 do_task(context); 3742 do_resume(_thread->osthread()); 3743 } 3744} 3745 3746class PcFetcher : public os::SuspendedThreadTask { 3747 public: 3748 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} 3749 ExtendedPC result(); 3750 protected: 3751 void do_task(const os::SuspendedThreadTaskContext& context); 3752 private: 3753 ExtendedPC _epc; 3754}; 3755 3756ExtendedPC PcFetcher::result() { 3757 guarantee(is_done(), "task is not done yet."); 3758 return _epc; 3759} 3760 3761void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { 3762 Thread* thread = context.thread(); 3763 OSThread* osthread = thread->osthread(); 3764 if (osthread->ucontext() != NULL) { 3765 _epc = os::Solaris::ucontext_get_pc((const ucontext_t *) context.ucontext()); 3766 } else { 3767 // NULL context is unexpected, double-check this is the VMThread 3768 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 3769 } 3770} 3771 3772// A lightweight implementation that does not suspend the target thread and 3773// thus returns only a hint. Used for profiling only! 3774ExtendedPC os::get_thread_pc(Thread* thread) { 3775 // Make sure that it is called by the watcher and the Threads lock is owned. 3776 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock"); 3777 // For now, is only used to profile the VM Thread 3778 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3779 PcFetcher fetcher(thread); 3780 fetcher.run(); 3781 return fetcher.result(); 3782} 3783 3784 3785// This does not do anything on Solaris. This is basically a hook for being 3786// able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 3787void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3788 const methodHandle& method, JavaCallArguments* args, 3789 Thread* thread) { 3790 f(value, method, args, thread); 3791} 3792 3793// This routine may be used by user applications as a "hook" to catch signals. 3794// The user-defined signal handler must pass unrecognized signals to this 3795// routine, and if it returns true (non-zero), then the signal handler must 3796// return immediately. If the flag "abort_if_unrecognized" is true, then this 3797// routine will never retun false (zero), but instead will execute a VM panic 3798// routine kill the process. 3799// 3800// If this routine returns false, it is OK to call it again. This allows 3801// the user-defined signal handler to perform checks either before or after 3802// the VM performs its own checks. Naturally, the user code would be making 3803// a serious error if it tried to handle an exception (such as a null check 3804// or breakpoint) that the VM was generating for its own correct operation. 3805// 3806// This routine may recognize any of the following kinds of signals: 3807// SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 3808// os::Solaris::SIGasync 3809// It should be consulted by handlers for any of those signals. 3810// 3811// The caller of this routine must pass in the three arguments supplied 3812// to the function referred to in the "sa_sigaction" (not the "sa_handler") 3813// field of the structure passed to sigaction(). This routine assumes that 3814// the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3815// 3816// Note that the VM will print warnings if it detects conflicting signal 3817// handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3818// 3819extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo, 3820 siginfo_t* siginfo, 3821 void* ucontext, 3822 int abort_if_unrecognized); 3823 3824 3825void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 3826 int orig_errno = errno; // Preserve errno value over signal handler. 3827 JVM_handle_solaris_signal(sig, info, ucVoid, true); 3828 errno = orig_errno; 3829} 3830 3831// This boolean allows users to forward their own non-matching signals 3832// to JVM_handle_solaris_signal, harmlessly. 3833bool os::Solaris::signal_handlers_are_installed = false; 3834 3835// For signal-chaining 3836bool os::Solaris::libjsig_is_loaded = false; 3837typedef struct sigaction *(*get_signal_t)(int); 3838get_signal_t os::Solaris::get_signal_action = NULL; 3839 3840struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 3841 struct sigaction *actp = NULL; 3842 3843 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) { 3844 // Retrieve the old signal handler from libjsig 3845 actp = (*get_signal_action)(sig); 3846 } 3847 if (actp == NULL) { 3848 // Retrieve the preinstalled signal handler from jvm 3849 actp = get_preinstalled_handler(sig); 3850 } 3851 3852 return actp; 3853} 3854 3855static bool call_chained_handler(struct sigaction *actp, int sig, 3856 siginfo_t *siginfo, void *context) { 3857 // Call the old signal handler 3858 if (actp->sa_handler == SIG_DFL) { 3859 // It's more reasonable to let jvm treat it as an unexpected exception 3860 // instead of taking the default action. 3861 return false; 3862 } else if (actp->sa_handler != SIG_IGN) { 3863 if ((actp->sa_flags & SA_NODEFER) == 0) { 3864 // automaticlly block the signal 3865 sigaddset(&(actp->sa_mask), sig); 3866 } 3867 3868 sa_handler_t hand; 3869 sa_sigaction_t sa; 3870 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3871 // retrieve the chained handler 3872 if (siginfo_flag_set) { 3873 sa = actp->sa_sigaction; 3874 } else { 3875 hand = actp->sa_handler; 3876 } 3877 3878 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3879 actp->sa_handler = SIG_DFL; 3880 } 3881 3882 // try to honor the signal mask 3883 sigset_t oset; 3884 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3885 3886 // call into the chained handler 3887 if (siginfo_flag_set) { 3888 (*sa)(sig, siginfo, context); 3889 } else { 3890 (*hand)(sig); 3891 } 3892 3893 // restore the signal mask 3894 pthread_sigmask(SIG_SETMASK, &oset, 0); 3895 } 3896 // Tell jvm's signal handler the signal is taken care of. 3897 return true; 3898} 3899 3900bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3901 bool chained = false; 3902 // signal-chaining 3903 if (UseSignalChaining) { 3904 struct sigaction *actp = get_chained_signal_action(sig); 3905 if (actp != NULL) { 3906 chained = call_chained_handler(actp, sig, siginfo, context); 3907 } 3908 } 3909 return chained; 3910} 3911 3912struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 3913 assert((chainedsigactions != (struct sigaction *)NULL) && 3914 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3915 if (preinstalled_sigs[sig] != 0) { 3916 return &chainedsigactions[sig]; 3917 } 3918 return NULL; 3919} 3920 3921void os::Solaris::save_preinstalled_handler(int sig, 3922 struct sigaction& oldAct) { 3923 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 3924 assert((chainedsigactions != (struct sigaction *)NULL) && 3925 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3926 chainedsigactions[sig] = oldAct; 3927 preinstalled_sigs[sig] = 1; 3928} 3929 3930void os::Solaris::set_signal_handler(int sig, bool set_installed, 3931 bool oktochain) { 3932 // Check for overwrite. 3933 struct sigaction oldAct; 3934 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3935 void* oldhand = 3936 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3937 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3938 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3939 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3940 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 3941 if (AllowUserSignalHandlers || !set_installed) { 3942 // Do not overwrite; user takes responsibility to forward to us. 3943 return; 3944 } else if (UseSignalChaining) { 3945 if (oktochain) { 3946 // save the old handler in jvm 3947 save_preinstalled_handler(sig, oldAct); 3948 } else { 3949 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal."); 3950 } 3951 // libjsig also interposes the sigaction() call below and saves the 3952 // old sigaction on it own. 3953 } else { 3954 fatal("Encountered unexpected pre-existing sigaction handler " 3955 "%#lx for signal %d.", (long)oldhand, sig); 3956 } 3957 } 3958 3959 struct sigaction sigAct; 3960 sigfillset(&(sigAct.sa_mask)); 3961 sigAct.sa_handler = SIG_DFL; 3962 3963 sigAct.sa_sigaction = signalHandler; 3964 // Handle SIGSEGV on alternate signal stack if 3965 // not using stack banging 3966 if (!UseStackBanging && sig == SIGSEGV) { 3967 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 3968 } else { 3969 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 3970 } 3971 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 3972 3973 sigaction(sig, &sigAct, &oldAct); 3974 3975 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3976 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3977 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3978} 3979 3980 3981#define DO_SIGNAL_CHECK(sig) \ 3982 do { \ 3983 if (!sigismember(&check_signal_done, sig)) { \ 3984 os::Solaris::check_signal_handler(sig); \ 3985 } \ 3986 } while (0) 3987 3988// This method is a periodic task to check for misbehaving JNI applications 3989// under CheckJNI, we can add any periodic checks here 3990 3991void os::run_periodic_checks() { 3992 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 3993 // thereby preventing a NULL checks. 3994 if (!check_addr0_done) check_addr0_done = check_addr0(tty); 3995 3996 if (check_signals == false) return; 3997 3998 // SEGV and BUS if overridden could potentially prevent 3999 // generation of hs*.log in the event of a crash, debugging 4000 // such a case can be very challenging, so we absolutely 4001 // check for the following for a good measure: 4002 DO_SIGNAL_CHECK(SIGSEGV); 4003 DO_SIGNAL_CHECK(SIGILL); 4004 DO_SIGNAL_CHECK(SIGFPE); 4005 DO_SIGNAL_CHECK(SIGBUS); 4006 DO_SIGNAL_CHECK(SIGPIPE); 4007 DO_SIGNAL_CHECK(SIGXFSZ); 4008 4009 // ReduceSignalUsage allows the user to override these handlers 4010 // see comments at the very top and jvm_solaris.h 4011 if (!ReduceSignalUsage) { 4012 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 4013 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 4014 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 4015 DO_SIGNAL_CHECK(BREAK_SIGNAL); 4016 } 4017 4018 // See comments above for using JVM1/JVM2 4019 DO_SIGNAL_CHECK(os::Solaris::SIGasync()); 4020 4021} 4022 4023typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 4024 4025static os_sigaction_t os_sigaction = NULL; 4026 4027void os::Solaris::check_signal_handler(int sig) { 4028 char buf[O_BUFLEN]; 4029 address jvmHandler = NULL; 4030 4031 struct sigaction act; 4032 if (os_sigaction == NULL) { 4033 // only trust the default sigaction, in case it has been interposed 4034 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 4035 if (os_sigaction == NULL) return; 4036 } 4037 4038 os_sigaction(sig, (struct sigaction*)NULL, &act); 4039 4040 address thisHandler = (act.sa_flags & SA_SIGINFO) 4041 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 4042 : CAST_FROM_FN_PTR(address, act.sa_handler); 4043 4044 4045 switch (sig) { 4046 case SIGSEGV: 4047 case SIGBUS: 4048 case SIGFPE: 4049 case SIGPIPE: 4050 case SIGXFSZ: 4051 case SIGILL: 4052 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4053 break; 4054 4055 case SHUTDOWN1_SIGNAL: 4056 case SHUTDOWN2_SIGNAL: 4057 case SHUTDOWN3_SIGNAL: 4058 case BREAK_SIGNAL: 4059 jvmHandler = (address)user_handler(); 4060 break; 4061 4062 default: 4063 int asynsig = os::Solaris::SIGasync(); 4064 4065 if (sig == asynsig) { 4066 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4067 } else { 4068 return; 4069 } 4070 break; 4071 } 4072 4073 4074 if (thisHandler != jvmHandler) { 4075 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 4076 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 4077 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 4078 // No need to check this sig any longer 4079 sigaddset(&check_signal_done, sig); 4080 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 4081 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 4082 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 4083 exception_name(sig, buf, O_BUFLEN)); 4084 } 4085 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 4086 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 4087 tty->print("expected:"); 4088 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig)); 4089 tty->cr(); 4090 tty->print(" found:"); 4091 os::Posix::print_sa_flags(tty, act.sa_flags); 4092 tty->cr(); 4093 // No need to check this sig any longer 4094 sigaddset(&check_signal_done, sig); 4095 } 4096 4097 // Print all the signal handler state 4098 if (sigismember(&check_signal_done, sig)) { 4099 print_signal_handlers(tty, buf, O_BUFLEN); 4100 } 4101 4102} 4103 4104void os::Solaris::install_signal_handlers() { 4105 bool libjsigdone = false; 4106 signal_handlers_are_installed = true; 4107 4108 // signal-chaining 4109 typedef void (*signal_setting_t)(); 4110 signal_setting_t begin_signal_setting = NULL; 4111 signal_setting_t end_signal_setting = NULL; 4112 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4113 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 4114 if (begin_signal_setting != NULL) { 4115 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4116 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 4117 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 4118 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 4119 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t, 4120 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version")); 4121 libjsig_is_loaded = true; 4122 if (os::Solaris::get_libjsig_version != NULL) { 4123 libjsigversion = (*os::Solaris::get_libjsig_version)(); 4124 } 4125 assert(UseSignalChaining, "should enable signal-chaining"); 4126 } 4127 if (libjsig_is_loaded) { 4128 // Tell libjsig jvm is setting signal handlers 4129 (*begin_signal_setting)(); 4130 } 4131 4132 set_signal_handler(SIGSEGV, true, true); 4133 set_signal_handler(SIGPIPE, true, true); 4134 set_signal_handler(SIGXFSZ, true, true); 4135 set_signal_handler(SIGBUS, true, true); 4136 set_signal_handler(SIGILL, true, true); 4137 set_signal_handler(SIGFPE, true, true); 4138 4139 4140 if (os::Solaris::SIGasync() > OLDMAXSIGNUM) { 4141 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so 4142 // can not register overridable signals which might be > 32 4143 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) { 4144 // Tell libjsig jvm has finished setting signal handlers 4145 (*end_signal_setting)(); 4146 libjsigdone = true; 4147 } 4148 } 4149 4150 set_signal_handler(os::Solaris::SIGasync(), true, true); 4151 4152 if (libjsig_is_loaded && !libjsigdone) { 4153 // Tell libjsig jvm finishes setting signal handlers 4154 (*end_signal_setting)(); 4155 } 4156 4157 // We don't activate signal checker if libjsig is in place, we trust ourselves 4158 // and if UserSignalHandler is installed all bets are off. 4159 // Log that signal checking is off only if -verbose:jni is specified. 4160 if (CheckJNICalls) { 4161 if (libjsig_is_loaded) { 4162 if (PrintJNIResolving) { 4163 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 4164 } 4165 check_signals = false; 4166 } 4167 if (AllowUserSignalHandlers) { 4168 if (PrintJNIResolving) { 4169 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4170 } 4171 check_signals = false; 4172 } 4173 } 4174} 4175 4176 4177void report_error(const char* file_name, int line_no, const char* title, 4178 const char* format, ...); 4179 4180// (Static) wrapper for getisax(2) call. 4181os::Solaris::getisax_func_t os::Solaris::_getisax = 0; 4182 4183// (Static) wrappers for the liblgrp API 4184os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 4185os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 4186os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 4187os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 4188os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 4189os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 4190os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 4191os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 4192os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 4193 4194// (Static) wrapper for meminfo() call. 4195os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0; 4196 4197static address resolve_symbol_lazy(const char* name) { 4198 address addr = (address) dlsym(RTLD_DEFAULT, name); 4199 if (addr == NULL) { 4200 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 4201 addr = (address) dlsym(RTLD_NEXT, name); 4202 } 4203 return addr; 4204} 4205 4206static address resolve_symbol(const char* name) { 4207 address addr = resolve_symbol_lazy(name); 4208 if (addr == NULL) { 4209 fatal(dlerror()); 4210 } 4211 return addr; 4212} 4213 4214void os::Solaris::libthread_init() { 4215 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 4216 4217 lwp_priocntl_init(); 4218 4219 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 4220 if (func == NULL) { 4221 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 4222 // Guarantee that this VM is running on an new enough OS (5.6 or 4223 // later) that it will have a new enough libthread.so. 4224 guarantee(func != NULL, "libthread.so is too old."); 4225 } 4226 4227 int size; 4228 void (*handler_info_func)(address *, int *); 4229 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 4230 handler_info_func(&handler_start, &size); 4231 handler_end = handler_start + size; 4232} 4233 4234 4235int_fnP_mutex_tP os::Solaris::_mutex_lock; 4236int_fnP_mutex_tP os::Solaris::_mutex_trylock; 4237int_fnP_mutex_tP os::Solaris::_mutex_unlock; 4238int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 4239int_fnP_mutex_tP os::Solaris::_mutex_destroy; 4240int os::Solaris::_mutex_scope = USYNC_THREAD; 4241 4242int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 4243int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 4244int_fnP_cond_tP os::Solaris::_cond_signal; 4245int_fnP_cond_tP os::Solaris::_cond_broadcast; 4246int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 4247int_fnP_cond_tP os::Solaris::_cond_destroy; 4248int os::Solaris::_cond_scope = USYNC_THREAD; 4249 4250void os::Solaris::synchronization_init() { 4251 if (UseLWPSynchronization) { 4252 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 4253 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 4254 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 4255 os::Solaris::set_mutex_init(lwp_mutex_init); 4256 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 4257 os::Solaris::set_mutex_scope(USYNC_THREAD); 4258 4259 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 4260 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 4261 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 4262 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 4263 os::Solaris::set_cond_init(lwp_cond_init); 4264 os::Solaris::set_cond_destroy(lwp_cond_destroy); 4265 os::Solaris::set_cond_scope(USYNC_THREAD); 4266 } else { 4267 os::Solaris::set_mutex_scope(USYNC_THREAD); 4268 os::Solaris::set_cond_scope(USYNC_THREAD); 4269 4270 if (UsePthreads) { 4271 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 4272 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 4273 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 4274 os::Solaris::set_mutex_init(pthread_mutex_default_init); 4275 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 4276 4277 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 4278 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 4279 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 4280 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 4281 os::Solaris::set_cond_init(pthread_cond_default_init); 4282 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 4283 } else { 4284 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 4285 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 4286 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 4287 os::Solaris::set_mutex_init(::mutex_init); 4288 os::Solaris::set_mutex_destroy(::mutex_destroy); 4289 4290 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 4291 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 4292 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 4293 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 4294 os::Solaris::set_cond_init(::cond_init); 4295 os::Solaris::set_cond_destroy(::cond_destroy); 4296 } 4297 } 4298} 4299 4300bool os::Solaris::liblgrp_init() { 4301 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 4302 if (handle != NULL) { 4303 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 4304 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 4305 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 4306 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 4307 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 4308 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 4309 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 4310 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 4311 dlsym(handle, "lgrp_cookie_stale"))); 4312 4313 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 4314 set_lgrp_cookie(c); 4315 return true; 4316 } 4317 return false; 4318} 4319 4320void os::Solaris::misc_sym_init() { 4321 address func; 4322 4323 // getisax 4324 func = resolve_symbol_lazy("getisax"); 4325 if (func != NULL) { 4326 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func); 4327 } 4328 4329 // meminfo 4330 func = resolve_symbol_lazy("meminfo"); 4331 if (func != NULL) { 4332 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func)); 4333 } 4334} 4335 4336uint_t os::Solaris::getisax(uint32_t* array, uint_t n) { 4337 assert(_getisax != NULL, "_getisax not set"); 4338 return _getisax(array, n); 4339} 4340 4341// int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 4342typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 4343static pset_getloadavg_type pset_getloadavg_ptr = NULL; 4344 4345void init_pset_getloadavg_ptr(void) { 4346 pset_getloadavg_ptr = 4347 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 4348 if (pset_getloadavg_ptr == NULL) { 4349 log_warning(os)("pset_getloadavg function not found"); 4350 } 4351} 4352 4353int os::Solaris::_dev_zero_fd = -1; 4354 4355// this is called _before_ the global arguments have been parsed 4356void os::init(void) { 4357 _initial_pid = getpid(); 4358 4359 max_hrtime = first_hrtime = gethrtime(); 4360 4361 init_random(1234567); 4362 4363 page_size = sysconf(_SC_PAGESIZE); 4364 if (page_size == -1) { 4365 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 4366 } 4367 init_page_sizes((size_t) page_size); 4368 4369 Solaris::initialize_system_info(); 4370 4371 // Initialize misc. symbols as soon as possible, so we can use them 4372 // if we need them. 4373 Solaris::misc_sym_init(); 4374 4375 int fd = ::open("/dev/zero", O_RDWR); 4376 if (fd < 0) { 4377 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno)); 4378 } else { 4379 Solaris::set_dev_zero_fd(fd); 4380 4381 // Close on exec, child won't inherit. 4382 fcntl(fd, F_SETFD, FD_CLOEXEC); 4383 } 4384 4385 clock_tics_per_sec = CLK_TCK; 4386 4387 // check if dladdr1() exists; dladdr1 can provide more information than 4388 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 4389 // and is available on linker patches for 5.7 and 5.8. 4390 // libdl.so must have been loaded, this call is just an entry lookup 4391 void * hdl = dlopen("libdl.so", RTLD_NOW); 4392 if (hdl) { 4393 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 4394 } 4395 4396 // (Solaris only) this switches to calls that actually do locking. 4397 ThreadCritical::initialize(); 4398 4399 main_thread = thr_self(); 4400 4401 // Constant minimum stack size allowed. It must be at least 4402 // the minimum of what the OS supports (thr_min_stack()), and 4403 // enough to allow the thread to get to user bytecode execution. 4404 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed); 4405 4406 // dynamic lookup of functions that may not be available in our lowest 4407 // supported Solaris release 4408 void * handle = dlopen("libc.so.1", RTLD_LAZY); 4409 if (handle != NULL) { 4410 Solaris::_pthread_setname_np = // from 11.3 4411 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np"); 4412 } 4413} 4414 4415// To install functions for atexit system call 4416extern "C" { 4417 static void perfMemory_exit_helper() { 4418 perfMemory_exit(); 4419 } 4420} 4421 4422// this is called _after_ the global arguments have been parsed 4423jint os::init_2(void) { 4424 // try to enable extended file IO ASAP, see 6431278 4425 os::Solaris::try_enable_extended_io(); 4426 4427 // Allocate a single page and mark it as readable for safepoint polling. Also 4428 // use this first mmap call to check support for MAP_ALIGN. 4429 address polling_page = (address)Solaris::mmap_chunk((char*)page_size, 4430 page_size, 4431 MAP_PRIVATE | MAP_ALIGN, 4432 PROT_READ); 4433 if (polling_page == NULL) { 4434 has_map_align = false; 4435 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, 4436 PROT_READ); 4437 } 4438 4439 os::set_polling_page(polling_page); 4440 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page)); 4441 4442 if (!UseMembar) { 4443 address mem_serialize_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE); 4444 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 4445 os::set_memory_serialize_page(mem_serialize_page); 4446 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page)); 4447 } 4448 4449 // Check minimum allowable stack size for thread creation and to initialize 4450 // the java system classes, including StackOverflowError - depends on page 4451 // size. Add two 4K pages for compiler2 recursion in main thread. 4452 // Add in 4*BytesPerWord 4K pages to account for VM stack during 4453 // class initialization depending on 32 or 64 bit VM. 4454 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed, 4455 JavaThread::stack_guard_zone_size() + 4456 JavaThread::stack_shadow_zone_size() + 4457 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K); 4458 4459 os::Solaris::min_stack_allowed = align_size_up(os::Solaris::min_stack_allowed, os::vm_page_size()); 4460 4461 size_t threadStackSizeInBytes = ThreadStackSize * K; 4462 if (threadStackSizeInBytes != 0 && 4463 threadStackSizeInBytes < os::Solaris::min_stack_allowed) { 4464 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk", 4465 os::Solaris::min_stack_allowed/K); 4466 return JNI_ERR; 4467 } 4468 4469 // For 64kbps there will be a 64kb page size, which makes 4470 // the usable default stack size quite a bit less. Increase the 4471 // stack for 64kb (or any > than 8kb) pages, this increases 4472 // virtual memory fragmentation (since we're not creating the 4473 // stack on a power of 2 boundary. The real fix for this 4474 // should be to fix the guard page mechanism. 4475 4476 if (vm_page_size() > 8*K) { 4477 threadStackSizeInBytes = (threadStackSizeInBytes != 0) 4478 ? threadStackSizeInBytes + 4479 JavaThread::stack_red_zone_size() + 4480 JavaThread::stack_yellow_zone_size() 4481 : 0; 4482 ThreadStackSize = threadStackSizeInBytes/K; 4483 } 4484 4485 // Make the stack size a multiple of the page size so that 4486 // the yellow/red zones can be guarded. 4487 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 4488 vm_page_size())); 4489 4490 Solaris::libthread_init(); 4491 4492 if (UseNUMA) { 4493 if (!Solaris::liblgrp_init()) { 4494 UseNUMA = false; 4495 } else { 4496 size_t lgrp_limit = os::numa_get_groups_num(); 4497 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); 4498 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 4499 FREE_C_HEAP_ARRAY(int, lgrp_ids); 4500 if (lgrp_num < 2) { 4501 // There's only one locality group, disable NUMA. 4502 UseNUMA = false; 4503 } 4504 } 4505 if (!UseNUMA && ForceNUMA) { 4506 UseNUMA = true; 4507 } 4508 } 4509 4510 Solaris::signal_sets_init(); 4511 Solaris::init_signal_mem(); 4512 Solaris::install_signal_handlers(); 4513 4514 if (libjsigversion < JSIG_VERSION_1_4_1) { 4515 Maxlibjsigsigs = OLDMAXSIGNUM; 4516 } 4517 4518 // initialize synchronization primitives to use either thread or 4519 // lwp synchronization (controlled by UseLWPSynchronization) 4520 Solaris::synchronization_init(); 4521 4522 if (MaxFDLimit) { 4523 // set the number of file descriptors to max. print out error 4524 // if getrlimit/setrlimit fails but continue regardless. 4525 struct rlimit nbr_files; 4526 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 4527 if (status != 0) { 4528 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 4529 } else { 4530 nbr_files.rlim_cur = nbr_files.rlim_max; 4531 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 4532 if (status != 0) { 4533 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 4534 } 4535 } 4536 } 4537 4538 // Calculate theoretical max. size of Threads to guard gainst 4539 // artifical out-of-memory situations, where all available address- 4540 // space has been reserved by thread stacks. Default stack size is 1Mb. 4541 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 4542 JavaThread::stack_size_at_create() : (1*K*K); 4543 assert(pre_thread_stack_size != 0, "Must have a stack"); 4544 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 4545 // we should start doing Virtual Memory banging. Currently when the threads will 4546 // have used all but 200Mb of space. 4547 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 4548 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 4549 4550 // at-exit methods are called in the reverse order of their registration. 4551 // In Solaris 7 and earlier, atexit functions are called on return from 4552 // main or as a result of a call to exit(3C). There can be only 32 of 4553 // these functions registered and atexit() does not set errno. In Solaris 4554 // 8 and later, there is no limit to the number of functions registered 4555 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 4556 // functions are called upon dlclose(3DL) in addition to return from main 4557 // and exit(3C). 4558 4559 if (PerfAllowAtExitRegistration) { 4560 // only register atexit functions if PerfAllowAtExitRegistration is set. 4561 // atexit functions can be delayed until process exit time, which 4562 // can be problematic for embedded VM situations. Embedded VMs should 4563 // call DestroyJavaVM() to assure that VM resources are released. 4564 4565 // note: perfMemory_exit_helper atexit function may be removed in 4566 // the future if the appropriate cleanup code can be added to the 4567 // VM_Exit VMOperation's doit method. 4568 if (atexit(perfMemory_exit_helper) != 0) { 4569 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 4570 } 4571 } 4572 4573 // Init pset_loadavg function pointer 4574 init_pset_getloadavg_ptr(); 4575 4576 return JNI_OK; 4577} 4578 4579// Mark the polling page as unreadable 4580void os::make_polling_page_unreadable(void) { 4581 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) { 4582 fatal("Could not disable polling page"); 4583 } 4584} 4585 4586// Mark the polling page as readable 4587void os::make_polling_page_readable(void) { 4588 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) { 4589 fatal("Could not enable polling page"); 4590 } 4591} 4592 4593// OS interface. 4594 4595bool os::check_heap(bool force) { return true; } 4596 4597// Is a (classpath) directory empty? 4598bool os::dir_is_empty(const char* path) { 4599 DIR *dir = NULL; 4600 struct dirent *ptr; 4601 4602 dir = opendir(path); 4603 if (dir == NULL) return true; 4604 4605 // Scan the directory 4606 bool result = true; 4607 char buf[sizeof(struct dirent) + MAX_PATH]; 4608 struct dirent *dbuf = (struct dirent *) buf; 4609 while (result && (ptr = readdir(dir, dbuf)) != NULL) { 4610 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 4611 result = false; 4612 } 4613 } 4614 closedir(dir); 4615 return result; 4616} 4617 4618// This code originates from JDK's sysOpen and open64_w 4619// from src/solaris/hpi/src/system_md.c 4620 4621int os::open(const char *path, int oflag, int mode) { 4622 if (strlen(path) > MAX_PATH - 1) { 4623 errno = ENAMETOOLONG; 4624 return -1; 4625 } 4626 int fd; 4627 4628 fd = ::open64(path, oflag, mode); 4629 if (fd == -1) return -1; 4630 4631 // If the open succeeded, the file might still be a directory 4632 { 4633 struct stat64 buf64; 4634 int ret = ::fstat64(fd, &buf64); 4635 int st_mode = buf64.st_mode; 4636 4637 if (ret != -1) { 4638 if ((st_mode & S_IFMT) == S_IFDIR) { 4639 errno = EISDIR; 4640 ::close(fd); 4641 return -1; 4642 } 4643 } else { 4644 ::close(fd); 4645 return -1; 4646 } 4647 } 4648 4649 // 32-bit Solaris systems suffer from: 4650 // 4651 // - an historical default soft limit of 256 per-process file 4652 // descriptors that is too low for many Java programs. 4653 // 4654 // - a design flaw where file descriptors created using stdio 4655 // fopen must be less than 256, _even_ when the first limit above 4656 // has been raised. This can cause calls to fopen (but not calls to 4657 // open, for example) to fail mysteriously, perhaps in 3rd party 4658 // native code (although the JDK itself uses fopen). One can hardly 4659 // criticize them for using this most standard of all functions. 4660 // 4661 // We attempt to make everything work anyways by: 4662 // 4663 // - raising the soft limit on per-process file descriptors beyond 4664 // 256 4665 // 4666 // - As of Solaris 10u4, we can request that Solaris raise the 256 4667 // stdio fopen limit by calling function enable_extended_FILE_stdio. 4668 // This is done in init_2 and recorded in enabled_extended_FILE_stdio 4669 // 4670 // - If we are stuck on an old (pre 10u4) Solaris system, we can 4671 // workaround the bug by remapping non-stdio file descriptors below 4672 // 256 to ones beyond 256, which is done below. 4673 // 4674 // See: 4675 // 1085341: 32-bit stdio routines should support file descriptors >255 4676 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files 4677 // 6431278: Netbeans crash on 32 bit Solaris: need to call 4678 // enable_extended_FILE_stdio() in VM initialisation 4679 // Giri Mandalika's blog 4680 // http://technopark02.blogspot.com/2005_05_01_archive.html 4681 // 4682#ifndef _LP64 4683 if ((!enabled_extended_FILE_stdio) && fd < 256) { 4684 int newfd = ::fcntl(fd, F_DUPFD, 256); 4685 if (newfd != -1) { 4686 ::close(fd); 4687 fd = newfd; 4688 } 4689 } 4690#endif // 32-bit Solaris 4691 4692 // All file descriptors that are opened in the JVM and not 4693 // specifically destined for a subprocess should have the 4694 // close-on-exec flag set. If we don't set it, then careless 3rd 4695 // party native code might fork and exec without closing all 4696 // appropriate file descriptors (e.g. as we do in closeDescriptors in 4697 // UNIXProcess.c), and this in turn might: 4698 // 4699 // - cause end-of-file to fail to be detected on some file 4700 // descriptors, resulting in mysterious hangs, or 4701 // 4702 // - might cause an fopen in the subprocess to fail on a system 4703 // suffering from bug 1085341. 4704 // 4705 // (Yes, the default setting of the close-on-exec flag is a Unix 4706 // design flaw) 4707 // 4708 // See: 4709 // 1085341: 32-bit stdio routines should support file descriptors >255 4710 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 4711 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 4712 // 4713#ifdef FD_CLOEXEC 4714 { 4715 int flags = ::fcntl(fd, F_GETFD); 4716 if (flags != -1) { 4717 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 4718 } 4719 } 4720#endif 4721 4722 return fd; 4723} 4724 4725// create binary file, rewriting existing file if required 4726int os::create_binary_file(const char* path, bool rewrite_existing) { 4727 int oflags = O_WRONLY | O_CREAT; 4728 if (!rewrite_existing) { 4729 oflags |= O_EXCL; 4730 } 4731 return ::open64(path, oflags, S_IREAD | S_IWRITE); 4732} 4733 4734// return current position of file pointer 4735jlong os::current_file_offset(int fd) { 4736 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 4737} 4738 4739// move file pointer to the specified offset 4740jlong os::seek_to_file_offset(int fd, jlong offset) { 4741 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 4742} 4743 4744jlong os::lseek(int fd, jlong offset, int whence) { 4745 return (jlong) ::lseek64(fd, offset, whence); 4746} 4747 4748char * os::native_path(char *path) { 4749 return path; 4750} 4751 4752int os::ftruncate(int fd, jlong length) { 4753 return ::ftruncate64(fd, length); 4754} 4755 4756int os::fsync(int fd) { 4757 RESTARTABLE_RETURN_INT(::fsync(fd)); 4758} 4759 4760int os::available(int fd, jlong *bytes) { 4761 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 4762 "Assumed _thread_in_native"); 4763 jlong cur, end; 4764 int mode; 4765 struct stat64 buf64; 4766 4767 if (::fstat64(fd, &buf64) >= 0) { 4768 mode = buf64.st_mode; 4769 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 4770 int n,ioctl_return; 4771 4772 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return); 4773 if (ioctl_return>= 0) { 4774 *bytes = n; 4775 return 1; 4776 } 4777 } 4778 } 4779 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 4780 return 0; 4781 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 4782 return 0; 4783 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 4784 return 0; 4785 } 4786 *bytes = end - cur; 4787 return 1; 4788} 4789 4790// Map a block of memory. 4791char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4792 char *addr, size_t bytes, bool read_only, 4793 bool allow_exec) { 4794 int prot; 4795 int flags; 4796 4797 if (read_only) { 4798 prot = PROT_READ; 4799 flags = MAP_SHARED; 4800 } else { 4801 prot = PROT_READ | PROT_WRITE; 4802 flags = MAP_PRIVATE; 4803 } 4804 4805 if (allow_exec) { 4806 prot |= PROT_EXEC; 4807 } 4808 4809 if (addr != NULL) { 4810 flags |= MAP_FIXED; 4811 } 4812 4813 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 4814 fd, file_offset); 4815 if (mapped_address == MAP_FAILED) { 4816 return NULL; 4817 } 4818 return mapped_address; 4819} 4820 4821 4822// Remap a block of memory. 4823char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4824 char *addr, size_t bytes, bool read_only, 4825 bool allow_exec) { 4826 // same as map_memory() on this OS 4827 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4828 allow_exec); 4829} 4830 4831 4832// Unmap a block of memory. 4833bool os::pd_unmap_memory(char* addr, size_t bytes) { 4834 return munmap(addr, bytes) == 0; 4835} 4836 4837void os::pause() { 4838 char filename[MAX_PATH]; 4839 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4840 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4841 } else { 4842 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4843 } 4844 4845 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4846 if (fd != -1) { 4847 struct stat buf; 4848 ::close(fd); 4849 while (::stat(filename, &buf) == 0) { 4850 (void)::poll(NULL, 0, 100); 4851 } 4852 } else { 4853 jio_fprintf(stderr, 4854 "Could not open pause file '%s', continuing immediately.\n", filename); 4855 } 4856} 4857 4858#ifndef PRODUCT 4859#ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4860// Turn this on if you need to trace synch operations. 4861// Set RECORD_SYNCH_LIMIT to a large-enough value, 4862// and call record_synch_enable and record_synch_disable 4863// around the computation of interest. 4864 4865void record_synch(char* name, bool returning); // defined below 4866 4867class RecordSynch { 4868 char* _name; 4869 public: 4870 RecordSynch(char* name) :_name(name) { record_synch(_name, false); } 4871 ~RecordSynch() { record_synch(_name, true); } 4872}; 4873 4874#define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 4875extern "C" ret name params { \ 4876 typedef ret name##_t params; \ 4877 static name##_t* implem = NULL; \ 4878 static int callcount = 0; \ 4879 if (implem == NULL) { \ 4880 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 4881 if (implem == NULL) fatal(dlerror()); \ 4882 } \ 4883 ++callcount; \ 4884 RecordSynch _rs(#name); \ 4885 inner; \ 4886 return implem args; \ 4887} 4888// in dbx, examine callcounts this way: 4889// for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 4890 4891#define CHECK_POINTER_OK(p) \ 4892 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) 4893#define CHECK_MU \ 4894 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 4895#define CHECK_CV \ 4896 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 4897#define CHECK_P(p) \ 4898 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 4899 4900#define CHECK_MUTEX(mutex_op) \ 4901 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 4902 4903CHECK_MUTEX( mutex_lock) 4904CHECK_MUTEX( _mutex_lock) 4905CHECK_MUTEX( mutex_unlock) 4906CHECK_MUTEX(_mutex_unlock) 4907CHECK_MUTEX( mutex_trylock) 4908CHECK_MUTEX(_mutex_trylock) 4909 4910#define CHECK_COND(cond_op) \ 4911 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV); 4912 4913CHECK_COND( cond_wait); 4914CHECK_COND(_cond_wait); 4915CHECK_COND(_cond_wait_cancel); 4916 4917#define CHECK_COND2(cond_op) \ 4918 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV); 4919 4920CHECK_COND2( cond_timedwait); 4921CHECK_COND2(_cond_timedwait); 4922CHECK_COND2(_cond_timedwait_cancel); 4923 4924// do the _lwp_* versions too 4925#define mutex_t lwp_mutex_t 4926#define cond_t lwp_cond_t 4927CHECK_MUTEX( _lwp_mutex_lock) 4928CHECK_MUTEX( _lwp_mutex_unlock) 4929CHECK_MUTEX( _lwp_mutex_trylock) 4930CHECK_MUTEX( __lwp_mutex_lock) 4931CHECK_MUTEX( __lwp_mutex_unlock) 4932CHECK_MUTEX( __lwp_mutex_trylock) 4933CHECK_MUTEX(___lwp_mutex_lock) 4934CHECK_MUTEX(___lwp_mutex_unlock) 4935 4936CHECK_COND( _lwp_cond_wait); 4937CHECK_COND( __lwp_cond_wait); 4938CHECK_COND(___lwp_cond_wait); 4939 4940CHECK_COND2( _lwp_cond_timedwait); 4941CHECK_COND2( __lwp_cond_timedwait); 4942#undef mutex_t 4943#undef cond_t 4944 4945CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4946CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4947CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 4948CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 4949CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4950CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4951CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4952CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4953 4954 4955// recording machinery: 4956 4957enum { RECORD_SYNCH_LIMIT = 200 }; 4958char* record_synch_name[RECORD_SYNCH_LIMIT]; 4959void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 4960bool record_synch_returning[RECORD_SYNCH_LIMIT]; 4961thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 4962int record_synch_count = 0; 4963bool record_synch_enabled = false; 4964 4965// in dbx, examine recorded data this way: 4966// for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 4967 4968void record_synch(char* name, bool returning) { 4969 if (record_synch_enabled) { 4970 if (record_synch_count < RECORD_SYNCH_LIMIT) { 4971 record_synch_name[record_synch_count] = name; 4972 record_synch_returning[record_synch_count] = returning; 4973 record_synch_thread[record_synch_count] = thr_self(); 4974 record_synch_arg0ptr[record_synch_count] = &name; 4975 record_synch_count++; 4976 } 4977 // put more checking code here: 4978 // ... 4979 } 4980} 4981 4982void record_synch_enable() { 4983 // start collecting trace data, if not already doing so 4984 if (!record_synch_enabled) record_synch_count = 0; 4985 record_synch_enabled = true; 4986} 4987 4988void record_synch_disable() { 4989 // stop collecting trace data 4990 record_synch_enabled = false; 4991} 4992 4993#endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4994#endif // PRODUCT 4995 4996const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4997const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 4998 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4999 5000 5001// JVMTI & JVM monitoring and management support 5002// The thread_cpu_time() and current_thread_cpu_time() are only 5003// supported if is_thread_cpu_time_supported() returns true. 5004// They are not supported on Solaris T1. 5005 5006// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 5007// are used by JVM M&M and JVMTI to get user+sys or user CPU time 5008// of a thread. 5009// 5010// current_thread_cpu_time() and thread_cpu_time(Thread *) 5011// returns the fast estimate available on the platform. 5012 5013// hrtime_t gethrvtime() return value includes 5014// user time but does not include system time 5015jlong os::current_thread_cpu_time() { 5016 return (jlong) gethrvtime(); 5017} 5018 5019jlong os::thread_cpu_time(Thread *thread) { 5020 // return user level CPU time only to be consistent with 5021 // what current_thread_cpu_time returns. 5022 // thread_cpu_time_info() must be changed if this changes 5023 return os::thread_cpu_time(thread, false /* user time only */); 5024} 5025 5026jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 5027 if (user_sys_cpu_time) { 5028 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 5029 } else { 5030 return os::current_thread_cpu_time(); 5031 } 5032} 5033 5034jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 5035 char proc_name[64]; 5036 int count; 5037 prusage_t prusage; 5038 jlong lwp_time; 5039 int fd; 5040 5041 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 5042 getpid(), 5043 thread->osthread()->lwp_id()); 5044 fd = ::open(proc_name, O_RDONLY); 5045 if (fd == -1) return -1; 5046 5047 do { 5048 count = ::pread(fd, 5049 (void *)&prusage.pr_utime, 5050 thr_time_size, 5051 thr_time_off); 5052 } while (count < 0 && errno == EINTR); 5053 ::close(fd); 5054 if (count < 0) return -1; 5055 5056 if (user_sys_cpu_time) { 5057 // user + system CPU time 5058 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 5059 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 5060 (jlong)prusage.pr_stime.tv_nsec + 5061 (jlong)prusage.pr_utime.tv_nsec; 5062 } else { 5063 // user level CPU time only 5064 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 5065 (jlong)prusage.pr_utime.tv_nsec; 5066 } 5067 5068 return (lwp_time); 5069} 5070 5071void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5072 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5073 info_ptr->may_skip_backward = false; // elapsed time not wall time 5074 info_ptr->may_skip_forward = false; // elapsed time not wall time 5075 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5076} 5077 5078void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5079 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5080 info_ptr->may_skip_backward = false; // elapsed time not wall time 5081 info_ptr->may_skip_forward = false; // elapsed time not wall time 5082 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5083} 5084 5085bool os::is_thread_cpu_time_supported() { 5086 return true; 5087} 5088 5089// System loadavg support. Returns -1 if load average cannot be obtained. 5090// Return the load average for our processor set if the primitive exists 5091// (Solaris 9 and later). Otherwise just return system wide loadavg. 5092int os::loadavg(double loadavg[], int nelem) { 5093 if (pset_getloadavg_ptr != NULL) { 5094 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 5095 } else { 5096 return ::getloadavg(loadavg, nelem); 5097 } 5098} 5099 5100//--------------------------------------------------------------------------------- 5101 5102bool os::find(address addr, outputStream* st) { 5103 Dl_info dlinfo; 5104 memset(&dlinfo, 0, sizeof(dlinfo)); 5105 if (dladdr(addr, &dlinfo) != 0) { 5106 st->print(PTR_FORMAT ": ", addr); 5107 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 5108 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 5109 } else if (dlinfo.dli_fbase != NULL) { 5110 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 5111 } else { 5112 st->print("<absolute address>"); 5113 } 5114 if (dlinfo.dli_fname != NULL) { 5115 st->print(" in %s", dlinfo.dli_fname); 5116 } 5117 if (dlinfo.dli_fbase != NULL) { 5118 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 5119 } 5120 st->cr(); 5121 5122 if (Verbose) { 5123 // decode some bytes around the PC 5124 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 5125 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 5126 address lowest = (address) dlinfo.dli_sname; 5127 if (!lowest) lowest = (address) dlinfo.dli_fbase; 5128 if (begin < lowest) begin = lowest; 5129 Dl_info dlinfo2; 5130 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 5131 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 5132 end = (address) dlinfo2.dli_saddr; 5133 } 5134 Disassembler::decode(begin, end, st); 5135 } 5136 return true; 5137 } 5138 return false; 5139} 5140 5141// Following function has been added to support HotSparc's libjvm.so running 5142// under Solaris production JDK 1.2.2 / 1.3.0. These came from 5143// src/solaris/hpi/native_threads in the EVM codebase. 5144// 5145// NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 5146// libraries and should thus be removed. We will leave it behind for a while 5147// until we no longer want to able to run on top of 1.3.0 Solaris production 5148// JDK. See 4341971. 5149 5150#define STACK_SLACK 0x800 5151 5152extern "C" { 5153 intptr_t sysThreadAvailableStackWithSlack() { 5154 stack_t st; 5155 intptr_t retval, stack_top; 5156 retval = thr_stksegment(&st); 5157 assert(retval == 0, "incorrect return value from thr_stksegment"); 5158 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 5159 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 5160 stack_top=(intptr_t)st.ss_sp-st.ss_size; 5161 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 5162 } 5163} 5164 5165// ObjectMonitor park-unpark infrastructure ... 5166// 5167// We implement Solaris and Linux PlatformEvents with the 5168// obvious condvar-mutex-flag triple. 5169// Another alternative that works quite well is pipes: 5170// Each PlatformEvent consists of a pipe-pair. 5171// The thread associated with the PlatformEvent 5172// calls park(), which reads from the input end of the pipe. 5173// Unpark() writes into the other end of the pipe. 5174// The write-side of the pipe must be set NDELAY. 5175// Unfortunately pipes consume a large # of handles. 5176// Native solaris lwp_park() and lwp_unpark() work nicely, too. 5177// Using pipes for the 1st few threads might be workable, however. 5178// 5179// park() is permitted to return spuriously. 5180// Callers of park() should wrap the call to park() in 5181// an appropriate loop. A litmus test for the correct 5182// usage of park is the following: if park() were modified 5183// to immediately return 0 your code should still work, 5184// albeit degenerating to a spin loop. 5185// 5186// In a sense, park()-unpark() just provides more polite spinning 5187// and polling with the key difference over naive spinning being 5188// that a parked thread needs to be explicitly unparked() in order 5189// to wake up and to poll the underlying condition. 5190// 5191// Assumption: 5192// Only one parker can exist on an event, which is why we allocate 5193// them per-thread. Multiple unparkers can coexist. 5194// 5195// _Event transitions in park() 5196// -1 => -1 : illegal 5197// 1 => 0 : pass - return immediately 5198// 0 => -1 : block; then set _Event to 0 before returning 5199// 5200// _Event transitions in unpark() 5201// 0 => 1 : just return 5202// 1 => 1 : just return 5203// -1 => either 0 or 1; must signal target thread 5204// That is, we can safely transition _Event from -1 to either 5205// 0 or 1. 5206// 5207// _Event serves as a restricted-range semaphore. 5208// -1 : thread is blocked, i.e. there is a waiter 5209// 0 : neutral: thread is running or ready, 5210// could have been signaled after a wait started 5211// 1 : signaled - thread is running or ready 5212// 5213// Another possible encoding of _Event would be with 5214// explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5215// 5216// TODO-FIXME: add DTRACE probes for: 5217// 1. Tx parks 5218// 2. Ty unparks Tx 5219// 3. Tx resumes from park 5220 5221 5222// value determined through experimentation 5223#define ROUNDINGFIX 11 5224 5225// utility to compute the abstime argument to timedwait. 5226// TODO-FIXME: switch from compute_abstime() to unpackTime(). 5227 5228static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 5229 // millis is the relative timeout time 5230 // abstime will be the absolute timeout time 5231 if (millis < 0) millis = 0; 5232 struct timeval now; 5233 int status = gettimeofday(&now, NULL); 5234 assert(status == 0, "gettimeofday"); 5235 jlong seconds = millis / 1000; 5236 jlong max_wait_period; 5237 5238 if (UseLWPSynchronization) { 5239 // forward port of fix for 4275818 (not sleeping long enough) 5240 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 5241 // _lwp_cond_timedwait() used a round_down algorithm rather 5242 // than a round_up. For millis less than our roundfactor 5243 // it rounded down to 0 which doesn't meet the spec. 5244 // For millis > roundfactor we may return a bit sooner, but 5245 // since we can not accurately identify the patch level and 5246 // this has already been fixed in Solaris 9 and 8 we will 5247 // leave it alone rather than always rounding down. 5248 5249 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 5250 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 5251 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 5252 max_wait_period = 21000000; 5253 } else { 5254 max_wait_period = 50000000; 5255 } 5256 millis %= 1000; 5257 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 5258 seconds = max_wait_period; 5259 } 5260 abstime->tv_sec = now.tv_sec + seconds; 5261 long usec = now.tv_usec + millis * 1000; 5262 if (usec >= 1000000) { 5263 abstime->tv_sec += 1; 5264 usec -= 1000000; 5265 } 5266 abstime->tv_nsec = usec * 1000; 5267 return abstime; 5268} 5269 5270void os::PlatformEvent::park() { // AKA: down() 5271 // Transitions for _Event: 5272 // -1 => -1 : illegal 5273 // 1 => 0 : pass - return immediately 5274 // 0 => -1 : block; then set _Event to 0 before returning 5275 5276 // Invariant: Only the thread associated with the Event/PlatformEvent 5277 // may call park(). 5278 assert(_nParked == 0, "invariant"); 5279 5280 int v; 5281 for (;;) { 5282 v = _Event; 5283 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5284 } 5285 guarantee(v >= 0, "invariant"); 5286 if (v == 0) { 5287 // Do this the hard way by blocking ... 5288 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5289 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5290 // Only for SPARC >= V8PlusA 5291#if defined(__sparc) && defined(COMPILER2) 5292 if (ClearFPUAtPark) { _mark_fpu_nosave(); } 5293#endif 5294 int status = os::Solaris::mutex_lock(_mutex); 5295 assert_status(status == 0, status, "mutex_lock"); 5296 guarantee(_nParked == 0, "invariant"); 5297 ++_nParked; 5298 while (_Event < 0) { 5299 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 5300 // Treat this the same as if the wait was interrupted 5301 // With usr/lib/lwp going to kernel, always handle ETIME 5302 status = os::Solaris::cond_wait(_cond, _mutex); 5303 if (status == ETIME) status = EINTR; 5304 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 5305 } 5306 --_nParked; 5307 _Event = 0; 5308 status = os::Solaris::mutex_unlock(_mutex); 5309 assert_status(status == 0, status, "mutex_unlock"); 5310 // Paranoia to ensure our locked and lock-free paths interact 5311 // correctly with each other. 5312 OrderAccess::fence(); 5313 } 5314} 5315 5316int os::PlatformEvent::park(jlong millis) { 5317 // Transitions for _Event: 5318 // -1 => -1 : illegal 5319 // 1 => 0 : pass - return immediately 5320 // 0 => -1 : block; then set _Event to 0 before returning 5321 5322 guarantee(_nParked == 0, "invariant"); 5323 int v; 5324 for (;;) { 5325 v = _Event; 5326 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5327 } 5328 guarantee(v >= 0, "invariant"); 5329 if (v != 0) return OS_OK; 5330 5331 int ret = OS_TIMEOUT; 5332 timestruc_t abst; 5333 compute_abstime(&abst, millis); 5334 5335 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5336 // For Solaris SPARC set fprs.FEF=0 prior to parking. 5337 // Only for SPARC >= V8PlusA 5338#if defined(__sparc) && defined(COMPILER2) 5339 if (ClearFPUAtPark) { _mark_fpu_nosave(); } 5340#endif 5341 int status = os::Solaris::mutex_lock(_mutex); 5342 assert_status(status == 0, status, "mutex_lock"); 5343 guarantee(_nParked == 0, "invariant"); 5344 ++_nParked; 5345 while (_Event < 0) { 5346 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 5347 assert_status(status == 0 || status == EINTR || 5348 status == ETIME || status == ETIMEDOUT, 5349 status, "cond_timedwait"); 5350 if (!FilterSpuriousWakeups) break; // previous semantics 5351 if (status == ETIME || status == ETIMEDOUT) break; 5352 // We consume and ignore EINTR and spurious wakeups. 5353 } 5354 --_nParked; 5355 if (_Event >= 0) ret = OS_OK; 5356 _Event = 0; 5357 status = os::Solaris::mutex_unlock(_mutex); 5358 assert_status(status == 0, status, "mutex_unlock"); 5359 // Paranoia to ensure our locked and lock-free paths interact 5360 // correctly with each other. 5361 OrderAccess::fence(); 5362 return ret; 5363} 5364 5365void os::PlatformEvent::unpark() { 5366 // Transitions for _Event: 5367 // 0 => 1 : just return 5368 // 1 => 1 : just return 5369 // -1 => either 0 or 1; must signal target thread 5370 // That is, we can safely transition _Event from -1 to either 5371 // 0 or 1. 5372 // See also: "Semaphores in Plan 9" by Mullender & Cox 5373 // 5374 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5375 // that it will take two back-to-back park() calls for the owning 5376 // thread to block. This has the benefit of forcing a spurious return 5377 // from the first park() call after an unpark() call which will help 5378 // shake out uses of park() and unpark() without condition variables. 5379 5380 if (Atomic::xchg(1, &_Event) >= 0) return; 5381 5382 // If the thread associated with the event was parked, wake it. 5383 // Wait for the thread assoc with the PlatformEvent to vacate. 5384 int status = os::Solaris::mutex_lock(_mutex); 5385 assert_status(status == 0, status, "mutex_lock"); 5386 int AnyWaiters = _nParked; 5387 status = os::Solaris::mutex_unlock(_mutex); 5388 assert_status(status == 0, status, "mutex_unlock"); 5389 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 5390 if (AnyWaiters != 0) { 5391 // Note that we signal() *after* dropping the lock for "immortal" Events. 5392 // This is safe and avoids a common class of futile wakeups. In rare 5393 // circumstances this can cause a thread to return prematurely from 5394 // cond_{timed}wait() but the spurious wakeup is benign and the victim 5395 // will simply re-test the condition and re-park itself. 5396 // This provides particular benefit if the underlying platform does not 5397 // provide wait morphing. 5398 status = os::Solaris::cond_signal(_cond); 5399 assert_status(status == 0, status, "cond_signal"); 5400 } 5401} 5402 5403// JSR166 5404// ------------------------------------------------------- 5405 5406// The solaris and linux implementations of park/unpark are fairly 5407// conservative for now, but can be improved. They currently use a 5408// mutex/condvar pair, plus _counter. 5409// Park decrements _counter if > 0, else does a condvar wait. Unpark 5410// sets count to 1 and signals condvar. Only one thread ever waits 5411// on the condvar. Contention seen when trying to park implies that someone 5412// is unparking you, so don't wait. And spurious returns are fine, so there 5413// is no need to track notifications. 5414 5415#define MAX_SECS 100000000 5416 5417// This code is common to linux and solaris and will be moved to a 5418// common place in dolphin. 5419// 5420// The passed in time value is either a relative time in nanoseconds 5421// or an absolute time in milliseconds. Either way it has to be unpacked 5422// into suitable seconds and nanoseconds components and stored in the 5423// given timespec structure. 5424// Given time is a 64-bit value and the time_t used in the timespec is only 5425// a signed-32-bit value (except on 64-bit Linux) we have to watch for 5426// overflow if times way in the future are given. Further on Solaris versions 5427// prior to 10 there is a restriction (see cond_timedwait) that the specified 5428// number of seconds, in abstime, is less than current_time + 100,000,000. 5429// As it will be 28 years before "now + 100000000" will overflow we can 5430// ignore overflow and just impose a hard-limit on seconds using the value 5431// of "now + 100,000,000". This places a limit on the timeout of about 3.17 5432// years from "now". 5433// 5434static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 5435 assert(time > 0, "convertTime"); 5436 5437 struct timeval now; 5438 int status = gettimeofday(&now, NULL); 5439 assert(status == 0, "gettimeofday"); 5440 5441 time_t max_secs = now.tv_sec + MAX_SECS; 5442 5443 if (isAbsolute) { 5444 jlong secs = time / 1000; 5445 if (secs > max_secs) { 5446 absTime->tv_sec = max_secs; 5447 } else { 5448 absTime->tv_sec = secs; 5449 } 5450 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 5451 } else { 5452 jlong secs = time / NANOSECS_PER_SEC; 5453 if (secs >= MAX_SECS) { 5454 absTime->tv_sec = max_secs; 5455 absTime->tv_nsec = 0; 5456 } else { 5457 absTime->tv_sec = now.tv_sec + secs; 5458 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 5459 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 5460 absTime->tv_nsec -= NANOSECS_PER_SEC; 5461 ++absTime->tv_sec; // note: this must be <= max_secs 5462 } 5463 } 5464 } 5465 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 5466 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 5467 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 5468 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 5469} 5470 5471void Parker::park(bool isAbsolute, jlong time) { 5472 // Ideally we'd do something useful while spinning, such 5473 // as calling unpackTime(). 5474 5475 // Optional fast-path check: 5476 // Return immediately if a permit is available. 5477 // We depend on Atomic::xchg() having full barrier semantics 5478 // since we are doing a lock-free update to _counter. 5479 if (Atomic::xchg(0, &_counter) > 0) return; 5480 5481 // Optional fast-exit: Check interrupt before trying to wait 5482 Thread* thread = Thread::current(); 5483 assert(thread->is_Java_thread(), "Must be JavaThread"); 5484 JavaThread *jt = (JavaThread *)thread; 5485 if (Thread::is_interrupted(thread, false)) { 5486 return; 5487 } 5488 5489 // First, demultiplex/decode time arguments 5490 timespec absTime; 5491 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all 5492 return; 5493 } 5494 if (time > 0) { 5495 // Warning: this code might be exposed to the old Solaris time 5496 // round-down bugs. Grep "roundingFix" for details. 5497 unpackTime(&absTime, isAbsolute, time); 5498 } 5499 5500 // Enter safepoint region 5501 // Beware of deadlocks such as 6317397. 5502 // The per-thread Parker:: _mutex is a classic leaf-lock. 5503 // In particular a thread must never block on the Threads_lock while 5504 // holding the Parker:: mutex. If safepoints are pending both the 5505 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 5506 ThreadBlockInVM tbivm(jt); 5507 5508 // Don't wait if cannot get lock since interference arises from 5509 // unblocking. Also. check interrupt before trying wait 5510 if (Thread::is_interrupted(thread, false) || 5511 os::Solaris::mutex_trylock(_mutex) != 0) { 5512 return; 5513 } 5514 5515 int status; 5516 5517 if (_counter > 0) { // no wait needed 5518 _counter = 0; 5519 status = os::Solaris::mutex_unlock(_mutex); 5520 assert(status == 0, "invariant"); 5521 // Paranoia to ensure our locked and lock-free paths interact 5522 // correctly with each other and Java-level accesses. 5523 OrderAccess::fence(); 5524 return; 5525 } 5526 5527#ifdef ASSERT 5528 // Don't catch signals while blocked; let the running threads have the signals. 5529 // (This allows a debugger to break into the running thread.) 5530 sigset_t oldsigs; 5531 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals(); 5532 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 5533#endif 5534 5535 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5536 jt->set_suspend_equivalent(); 5537 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 5538 5539 // Do this the hard way by blocking ... 5540 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5541 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5542 // Only for SPARC >= V8PlusA 5543#if defined(__sparc) && defined(COMPILER2) 5544 if (ClearFPUAtPark) { _mark_fpu_nosave(); } 5545#endif 5546 5547 if (time == 0) { 5548 status = os::Solaris::cond_wait(_cond, _mutex); 5549 } else { 5550 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 5551 } 5552 // Note that an untimed cond_wait() can sometimes return ETIME on older 5553 // versions of the Solaris. 5554 assert_status(status == 0 || status == EINTR || 5555 status == ETIME || status == ETIMEDOUT, 5556 status, "cond_timedwait"); 5557 5558#ifdef ASSERT 5559 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); 5560#endif 5561 _counter = 0; 5562 status = os::Solaris::mutex_unlock(_mutex); 5563 assert_status(status == 0, status, "mutex_unlock"); 5564 // Paranoia to ensure our locked and lock-free paths interact 5565 // correctly with each other and Java-level accesses. 5566 OrderAccess::fence(); 5567 5568 // If externally suspended while waiting, re-suspend 5569 if (jt->handle_special_suspend_equivalent_condition()) { 5570 jt->java_suspend_self(); 5571 } 5572} 5573 5574void Parker::unpark() { 5575 int status = os::Solaris::mutex_lock(_mutex); 5576 assert(status == 0, "invariant"); 5577 const int s = _counter; 5578 _counter = 1; 5579 status = os::Solaris::mutex_unlock(_mutex); 5580 assert(status == 0, "invariant"); 5581 5582 if (s < 1) { 5583 status = os::Solaris::cond_signal(_cond); 5584 assert(status == 0, "invariant"); 5585 } 5586} 5587 5588extern char** environ; 5589 5590// Run the specified command in a separate process. Return its exit value, 5591// or -1 on failure (e.g. can't fork a new process). 5592// Unlike system(), this function can be called from signal handler. It 5593// doesn't block SIGINT et al. 5594int os::fork_and_exec(char* cmd) { 5595 char * argv[4]; 5596 argv[0] = (char *)"sh"; 5597 argv[1] = (char *)"-c"; 5598 argv[2] = cmd; 5599 argv[3] = NULL; 5600 5601 // fork is async-safe, fork1 is not so can't use in signal handler 5602 pid_t pid; 5603 Thread* t = Thread::current_or_null_safe(); 5604 if (t != NULL && t->is_inside_signal_handler()) { 5605 pid = fork(); 5606 } else { 5607 pid = fork1(); 5608 } 5609 5610 if (pid < 0) { 5611 // fork failed 5612 warning("fork failed: %s", os::strerror(errno)); 5613 return -1; 5614 5615 } else if (pid == 0) { 5616 // child process 5617 5618 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 5619 execve("/usr/bin/sh", argv, environ); 5620 5621 // execve failed 5622 _exit(-1); 5623 5624 } else { 5625 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5626 // care about the actual exit code, for now. 5627 5628 int status; 5629 5630 // Wait for the child process to exit. This returns immediately if 5631 // the child has already exited. */ 5632 while (waitpid(pid, &status, 0) < 0) { 5633 switch (errno) { 5634 case ECHILD: return 0; 5635 case EINTR: break; 5636 default: return -1; 5637 } 5638 } 5639 5640 if (WIFEXITED(status)) { 5641 // The child exited normally; get its exit code. 5642 return WEXITSTATUS(status); 5643 } else if (WIFSIGNALED(status)) { 5644 // The child exited because of a signal 5645 // The best value to return is 0x80 + signal number, 5646 // because that is what all Unix shells do, and because 5647 // it allows callers to distinguish between process exit and 5648 // process death by signal. 5649 return 0x80 + WTERMSIG(status); 5650 } else { 5651 // Unknown exit code; pass it through 5652 return status; 5653 } 5654 } 5655} 5656 5657// is_headless_jre() 5658// 5659// Test for the existence of xawt/libmawt.so or libawt_xawt.so 5660// in order to report if we are running in a headless jre 5661// 5662// Since JDK8 xawt/libmawt.so was moved into the same directory 5663// as libawt.so, and renamed libawt_xawt.so 5664// 5665bool os::is_headless_jre() { 5666 struct stat statbuf; 5667 char buf[MAXPATHLEN]; 5668 char libmawtpath[MAXPATHLEN]; 5669 const char *xawtstr = "/xawt/libmawt.so"; 5670 const char *new_xawtstr = "/libawt_xawt.so"; 5671 char *p; 5672 5673 // Get path to libjvm.so 5674 os::jvm_path(buf, sizeof(buf)); 5675 5676 // Get rid of libjvm.so 5677 p = strrchr(buf, '/'); 5678 if (p == NULL) { 5679 return false; 5680 } else { 5681 *p = '\0'; 5682 } 5683 5684 // Get rid of client or server 5685 p = strrchr(buf, '/'); 5686 if (p == NULL) { 5687 return false; 5688 } else { 5689 *p = '\0'; 5690 } 5691 5692 // check xawt/libmawt.so 5693 strcpy(libmawtpath, buf); 5694 strcat(libmawtpath, xawtstr); 5695 if (::stat(libmawtpath, &statbuf) == 0) return false; 5696 5697 // check libawt_xawt.so 5698 strcpy(libmawtpath, buf); 5699 strcat(libmawtpath, new_xawtstr); 5700 if (::stat(libmawtpath, &statbuf) == 0) return false; 5701 5702 return true; 5703} 5704 5705size_t os::write(int fd, const void *buf, unsigned int nBytes) { 5706 size_t res; 5707 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res); 5708 return res; 5709} 5710 5711int os::close(int fd) { 5712 return ::close(fd); 5713} 5714 5715int os::socket_close(int fd) { 5716 return ::close(fd); 5717} 5718 5719int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5720 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5721 "Assumed _thread_in_native"); 5722 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags)); 5723} 5724 5725int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5726 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5727 "Assumed _thread_in_native"); 5728 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5729} 5730 5731int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5732 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5733} 5734 5735// As both poll and select can be interrupted by signals, we have to be 5736// prepared to restart the system call after updating the timeout, unless 5737// a poll() is done with timeout == -1, in which case we repeat with this 5738// "wait forever" value. 5739 5740int os::connect(int fd, struct sockaddr *him, socklen_t len) { 5741 int _result; 5742 _result = ::connect(fd, him, len); 5743 5744 // On Solaris, when a connect() call is interrupted, the connection 5745 // can be established asynchronously (see 6343810). Subsequent calls 5746 // to connect() must check the errno value which has the semantic 5747 // described below (copied from the connect() man page). Handling 5748 // of asynchronously established connections is required for both 5749 // blocking and non-blocking sockets. 5750 // EINTR The connection attempt was interrupted 5751 // before any data arrived by the delivery of 5752 // a signal. The connection, however, will be 5753 // established asynchronously. 5754 // 5755 // EINPROGRESS The socket is non-blocking, and the connec- 5756 // tion cannot be completed immediately. 5757 // 5758 // EALREADY The socket is non-blocking, and a previous 5759 // connection attempt has not yet been com- 5760 // pleted. 5761 // 5762 // EISCONN The socket is already connected. 5763 if (_result == OS_ERR && errno == EINTR) { 5764 // restarting a connect() changes its errno semantics 5765 RESTARTABLE(::connect(fd, him, len), _result); 5766 // undo these changes 5767 if (_result == OS_ERR) { 5768 if (errno == EALREADY) { 5769 errno = EINPROGRESS; // fall through 5770 } else if (errno == EISCONN) { 5771 errno = 0; 5772 return OS_OK; 5773 } 5774 } 5775 } 5776 return _result; 5777} 5778 5779// Get the default path to the core file 5780// Returns the length of the string 5781int os::get_core_path(char* buffer, size_t bufferSize) { 5782 const char* p = get_current_directory(buffer, bufferSize); 5783 5784 if (p == NULL) { 5785 assert(p != NULL, "failed to get current directory"); 5786 return 0; 5787 } 5788 5789 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 5790 p, current_process_id()); 5791 5792 return strlen(buffer); 5793} 5794 5795#ifndef PRODUCT 5796void TestReserveMemorySpecial_test() { 5797 // No tests available for this platform 5798} 5799#endif 5800 5801bool os::start_debugging(char *buf, int buflen) { 5802 int len = (int)strlen(buf); 5803 char *p = &buf[len]; 5804 5805 jio_snprintf(p, buflen-len, 5806 "\n\n" 5807 "Do you want to debug the problem?\n\n" 5808 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n" 5809 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 5810 "Otherwise, press RETURN to abort...", 5811 os::current_process_id(), os::current_thread_id()); 5812 5813 bool yes = os::message_box("Unexpected Error", buf); 5814 5815 if (yes) { 5816 // yes, user asked VM to launch debugger 5817 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id()); 5818 5819 os::fork_and_exec(buf); 5820 yes = false; 5821 } 5822 return yes; 5823} 5824