os_solaris.cpp revision 11271:e62bbe48bd66
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 <pwd.h> 83# include <schedctl.h> 84# include <setjmp.h> 85# include <signal.h> 86# include <stdio.h> 87# include <alloca.h> 88# include <sys/filio.h> 89# include <sys/ipc.h> 90# include <sys/lwp.h> 91# include <sys/machelf.h> // for elf Sym structure used by dladdr1 92# include <sys/mman.h> 93# include <sys/processor.h> 94# include <sys/procset.h> 95# include <sys/pset.h> 96# include <sys/resource.h> 97# include <sys/shm.h> 98# include <sys/socket.h> 99# include <sys/stat.h> 100# include <sys/systeminfo.h> 101# include <sys/time.h> 102# include <sys/times.h> 103# include <sys/types.h> 104# include <sys/wait.h> 105# include <sys/utsname.h> 106# include <thread.h> 107# include <unistd.h> 108# include <sys/priocntl.h> 109# include <sys/rtpriocntl.h> 110# include <sys/tspriocntl.h> 111# include <sys/iapriocntl.h> 112# include <sys/fxpriocntl.h> 113# include <sys/loadavg.h> 114# include <string.h> 115# include <stdio.h> 116 117# define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 118# include <sys/procfs.h> // see comment in <sys/procfs.h> 119 120#define MAX_PATH (2 * K) 121 122// for timer info max values which include all bits 123#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 124 125 126// Here are some liblgrp types from sys/lgrp_user.h to be able to 127// compile on older systems without this header file. 128 129#ifndef MADV_ACCESS_LWP 130 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */ 131#endif 132#ifndef MADV_ACCESS_MANY 133 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */ 134#endif 135 136#ifndef LGRP_RSRC_CPU 137 #define LGRP_RSRC_CPU 0 /* CPU resources */ 138#endif 139#ifndef LGRP_RSRC_MEM 140 #define LGRP_RSRC_MEM 1 /* memory resources */ 141#endif 142 143// Values for ThreadPriorityPolicy == 1 144int prio_policy1[CriticalPriority+1] = { 145 -99999, 0, 16, 32, 48, 64, 146 80, 96, 112, 124, 127, 127 }; 147 148// System parameters used internally 149static clock_t clock_tics_per_sec = 100; 150 151// Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+) 152static bool enabled_extended_FILE_stdio = false; 153 154// For diagnostics to print a message once. see run_periodic_checks 155static bool check_addr0_done = false; 156static sigset_t check_signal_done; 157static bool check_signals = true; 158 159address os::Solaris::handler_start; // start pc of thr_sighndlrinfo 160address os::Solaris::handler_end; // end pc of thr_sighndlrinfo 161 162address os::Solaris::_main_stack_base = NULL; // 4352906 workaround 163 164os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL; 165 166// "default" initializers for missing libc APIs 167extern "C" { 168 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 169 static int lwp_mutex_destroy(mutex_t *mx) { return 0; } 170 171 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 172 static int lwp_cond_destroy(cond_t *cv) { return 0; } 173} 174 175// "default" initializers for pthread-based synchronization 176extern "C" { 177 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 178 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 179} 180 181static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); 182 183static inline size_t adjust_stack_size(address base, size_t size) { 184 if ((ssize_t)size < 0) { 185 // 4759953: Compensate for ridiculous stack size. 186 size = max_intx; 187 } 188 if (size > (size_t)base) { 189 // 4812466: Make sure size doesn't allow the stack to wrap the address space. 190 size = (size_t)base; 191 } 192 return size; 193} 194 195static inline stack_t get_stack_info() { 196 stack_t st; 197 int retval = thr_stksegment(&st); 198 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); 199 assert(retval == 0, "incorrect return value from thr_stksegment"); 200 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 201 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 202 return st; 203} 204 205address os::current_stack_base() { 206 int r = thr_main(); 207 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 208 bool is_primordial_thread = r; 209 210 // Workaround 4352906, avoid calls to thr_stksegment by 211 // thr_main after the first one (it looks like we trash 212 // some data, causing the value for ss_sp to be incorrect). 213 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) { 214 stack_t st = get_stack_info(); 215 if (is_primordial_thread) { 216 // cache initial value of stack base 217 os::Solaris::_main_stack_base = (address)st.ss_sp; 218 } 219 return (address)st.ss_sp; 220 } else { 221 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); 222 return os::Solaris::_main_stack_base; 223 } 224} 225 226size_t os::current_stack_size() { 227 size_t size; 228 229 int r = thr_main(); 230 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 231 if (!r) { 232 size = get_stack_info().ss_size; 233 } else { 234 struct rlimit limits; 235 getrlimit(RLIMIT_STACK, &limits); 236 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); 237 } 238 // base may not be page aligned 239 address base = current_stack_base(); 240 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());; 241 return (size_t)(base - bottom); 242} 243 244struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 245 return localtime_r(clock, res); 246} 247 248void os::Solaris::try_enable_extended_io() { 249 typedef int (*enable_extended_FILE_stdio_t)(int, int); 250 251 if (!UseExtendedFileIO) { 252 return; 253 } 254 255 enable_extended_FILE_stdio_t enabler = 256 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT, 257 "enable_extended_FILE_stdio"); 258 if (enabler) { 259 enabler(-1, -1); 260 } 261} 262 263static int _processors_online = 0; 264 265jint os::Solaris::_os_thread_limit = 0; 266volatile jint os::Solaris::_os_thread_count = 0; 267 268julong os::available_memory() { 269 return Solaris::available_memory(); 270} 271 272julong os::Solaris::available_memory() { 273 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); 274} 275 276julong os::Solaris::_physical_memory = 0; 277 278julong os::physical_memory() { 279 return Solaris::physical_memory(); 280} 281 282static hrtime_t first_hrtime = 0; 283static const hrtime_t hrtime_hz = 1000*1000*1000; 284static volatile hrtime_t max_hrtime = 0; 285 286 287void os::Solaris::initialize_system_info() { 288 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); 289 _processors_online = sysconf(_SC_NPROCESSORS_ONLN); 290 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * 291 (julong)sysconf(_SC_PAGESIZE); 292} 293 294int os::active_processor_count() { 295 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 296 pid_t pid = getpid(); 297 psetid_t pset = PS_NONE; 298 // Are we running in a processor set or is there any processor set around? 299 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) { 300 uint_t pset_cpus; 301 // Query the number of cpus available to us. 302 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) { 303 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check"); 304 _processors_online = pset_cpus; 305 return pset_cpus; 306 } 307 } 308 // Otherwise return number of online cpus 309 return online_cpus; 310} 311 312static bool find_processors_in_pset(psetid_t pset, 313 processorid_t** id_array, 314 uint_t* id_length) { 315 bool result = false; 316 // Find the number of processors in the processor set. 317 if (pset_info(pset, NULL, id_length, NULL) == 0) { 318 // Make up an array to hold their ids. 319 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 320 // Fill in the array with their processor ids. 321 if (pset_info(pset, NULL, id_length, *id_array) == 0) { 322 result = true; 323 } 324 } 325 return result; 326} 327 328// Callers of find_processors_online() must tolerate imprecise results -- 329// the system configuration can change asynchronously because of DR 330// or explicit psradm operations. 331// 332// We also need to take care that the loop (below) terminates as the 333// number of processors online can change between the _SC_NPROCESSORS_ONLN 334// request and the loop that builds the list of processor ids. Unfortunately 335// there's no reliable way to determine the maximum valid processor id, 336// so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online 337// man pages, which claim the processor id set is "sparse, but 338// not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually 339// exit the loop. 340// 341// In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's 342// not available on S8.0. 343 344static bool find_processors_online(processorid_t** id_array, 345 uint* id_length) { 346 const processorid_t MAX_PROCESSOR_ID = 100000; 347 // Find the number of processors online. 348 *id_length = sysconf(_SC_NPROCESSORS_ONLN); 349 // Make up an array to hold their ids. 350 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 351 // Processors need not be numbered consecutively. 352 long found = 0; 353 processorid_t next = 0; 354 while (found < *id_length && next < MAX_PROCESSOR_ID) { 355 processor_info_t info; 356 if (processor_info(next, &info) == 0) { 357 // NB, PI_NOINTR processors are effectively online ... 358 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) { 359 (*id_array)[found] = next; 360 found += 1; 361 } 362 } 363 next += 1; 364 } 365 if (found < *id_length) { 366 // The loop above didn't identify the expected number of processors. 367 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN) 368 // and re-running the loop, above, but there's no guarantee of progress 369 // if the system configuration is in flux. Instead, we just return what 370 // we've got. Note that in the worst case find_processors_online() could 371 // return an empty set. (As a fall-back in the case of the empty set we 372 // could just return the ID of the current processor). 373 *id_length = found; 374 } 375 376 return true; 377} 378 379static bool assign_distribution(processorid_t* id_array, 380 uint id_length, 381 uint* distribution, 382 uint distribution_length) { 383 // We assume we can assign processorid_t's to uint's. 384 assert(sizeof(processorid_t) == sizeof(uint), 385 "can't convert processorid_t to uint"); 386 // Quick check to see if we won't succeed. 387 if (id_length < distribution_length) { 388 return false; 389 } 390 // Assign processor ids to the distribution. 391 // Try to shuffle processors to distribute work across boards, 392 // assuming 4 processors per board. 393 const uint processors_per_board = ProcessDistributionStride; 394 // Find the maximum processor id. 395 processorid_t max_id = 0; 396 for (uint m = 0; m < id_length; m += 1) { 397 max_id = MAX2(max_id, id_array[m]); 398 } 399 // The next id, to limit loops. 400 const processorid_t limit_id = max_id + 1; 401 // Make up markers for available processors. 402 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal); 403 for (uint c = 0; c < limit_id; c += 1) { 404 available_id[c] = false; 405 } 406 for (uint a = 0; a < id_length; a += 1) { 407 available_id[id_array[a]] = true; 408 } 409 // Step by "boards", then by "slot", copying to "assigned". 410 // NEEDS_CLEANUP: The assignment of processors should be stateful, 411 // remembering which processors have been assigned by 412 // previous calls, etc., so as to distribute several 413 // independent calls of this method. What we'd like is 414 // It would be nice to have an API that let us ask 415 // how many processes are bound to a processor, 416 // but we don't have that, either. 417 // In the short term, "board" is static so that 418 // subsequent distributions don't all start at board 0. 419 static uint board = 0; 420 uint assigned = 0; 421 // Until we've found enough processors .... 422 while (assigned < distribution_length) { 423 // ... find the next available processor in the board. 424 for (uint slot = 0; slot < processors_per_board; slot += 1) { 425 uint try_id = board * processors_per_board + slot; 426 if ((try_id < limit_id) && (available_id[try_id] == true)) { 427 distribution[assigned] = try_id; 428 available_id[try_id] = false; 429 assigned += 1; 430 break; 431 } 432 } 433 board += 1; 434 if (board * processors_per_board + 0 >= limit_id) { 435 board = 0; 436 } 437 } 438 if (available_id != NULL) { 439 FREE_C_HEAP_ARRAY(bool, available_id); 440 } 441 return true; 442} 443 444void os::set_native_thread_name(const char *name) { 445 if (Solaris::_pthread_setname_np != NULL) { 446 // Only the first 31 bytes of 'name' are processed by pthread_setname_np 447 // but we explicitly copy into a size-limited buffer to avoid any 448 // possible overflow. 449 char buf[32]; 450 snprintf(buf, sizeof(buf), "%s", name); 451 buf[sizeof(buf) - 1] = '\0'; 452 Solaris::_pthread_setname_np(pthread_self(), buf); 453 } 454} 455 456bool os::distribute_processes(uint length, uint* distribution) { 457 bool result = false; 458 // Find the processor id's of all the available CPUs. 459 processorid_t* id_array = NULL; 460 uint id_length = 0; 461 // There are some races between querying information and using it, 462 // since processor sets can change dynamically. 463 psetid_t pset = PS_NONE; 464 // Are we running in a processor set? 465 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) { 466 result = find_processors_in_pset(pset, &id_array, &id_length); 467 } else { 468 result = find_processors_online(&id_array, &id_length); 469 } 470 if (result == true) { 471 if (id_length >= length) { 472 result = assign_distribution(id_array, id_length, distribution, length); 473 } else { 474 result = false; 475 } 476 } 477 if (id_array != NULL) { 478 FREE_C_HEAP_ARRAY(processorid_t, id_array); 479 } 480 return result; 481} 482 483bool os::bind_to_processor(uint processor_id) { 484 // We assume that a processorid_t can be stored in a uint. 485 assert(sizeof(uint) == sizeof(processorid_t), 486 "can't convert uint to processorid_t"); 487 int bind_result = 488 processor_bind(P_LWPID, // bind LWP. 489 P_MYID, // bind current LWP. 490 (processorid_t) processor_id, // id. 491 NULL); // don't return old binding. 492 return (bind_result == 0); 493} 494 495// Return true if user is running as root. 496 497bool os::have_special_privileges() { 498 static bool init = false; 499 static bool privileges = false; 500 if (!init) { 501 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 502 init = true; 503 } 504 return privileges; 505} 506 507 508void os::init_system_properties_values() { 509 // The next steps are taken in the product version: 510 // 511 // Obtain the JAVA_HOME value from the location of libjvm.so. 512 // This library should be located at: 513 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 514 // 515 // If "/jre/lib/" appears at the right place in the path, then we 516 // assume libjvm.so is installed in a JDK and we use this path. 517 // 518 // Otherwise exit with message: "Could not create the Java virtual machine." 519 // 520 // The following extra steps are taken in the debugging version: 521 // 522 // If "/jre/lib/" does NOT appear at the right place in the path 523 // instead of exit check for $JAVA_HOME environment variable. 524 // 525 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 526 // then we append a fake suffix "hotspot/libjvm.so" to this path so 527 // it looks like libjvm.so is installed there 528 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 529 // 530 // Otherwise exit. 531 // 532 // Important note: if the location of libjvm.so changes this 533 // code needs to be changed accordingly. 534 535// Base path of extensions installed on the system. 536#define SYS_EXT_DIR "/usr/jdk/packages" 537#define EXTENSIONS_DIR "/lib/ext" 538 539 char cpu_arch[12]; 540 // Buffer that fits several sprintfs. 541 // Note that the space for the colon and the trailing null are provided 542 // by the nulls included by the sizeof operator. 543 const size_t bufsize = 544 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends. 545 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch), // invariant ld_library_path 546 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir 547 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 548 549 // sysclasspath, java_home, dll_dir 550 { 551 char *pslash; 552 os::jvm_path(buf, bufsize); 553 554 // Found the full path to libjvm.so. 555 // Now cut the path to <java_home>/jre if we can. 556 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 557 pslash = strrchr(buf, '/'); 558 if (pslash != NULL) { 559 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 560 } 561 Arguments::set_dll_dir(buf); 562 563 if (pslash != NULL) { 564 pslash = strrchr(buf, '/'); 565 if (pslash != NULL) { 566 *pslash = '\0'; // Get rid of /<arch>. 567 pslash = strrchr(buf, '/'); 568 if (pslash != NULL) { 569 *pslash = '\0'; // Get rid of /lib. 570 } 571 } 572 } 573 Arguments::set_java_home(buf); 574 set_boot_path('/', ':'); 575 } 576 577 // Where to look for native libraries. 578 { 579 // Use dlinfo() to determine the correct java.library.path. 580 // 581 // If we're launched by the Java launcher, and the user 582 // does not set java.library.path explicitly on the commandline, 583 // the Java launcher sets LD_LIBRARY_PATH for us and unsets 584 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case 585 // dlinfo returns LD_LIBRARY_PATH + crle settings (including 586 // /usr/lib), which is exactly what we want. 587 // 588 // If the user does set java.library.path, it completely 589 // overwrites this setting, and always has. 590 // 591 // If we're not launched by the Java launcher, we may 592 // get here with any/all of the LD_LIBRARY_PATH[_32|64] 593 // settings. Again, dlinfo does exactly what we want. 594 595 Dl_serinfo info_sz, *info = &info_sz; 596 Dl_serpath *path; 597 char *library_path; 598 char *common_path = buf; 599 600 // Determine search path count and required buffer size. 601 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) { 602 FREE_C_HEAP_ARRAY(char, buf); 603 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror()); 604 } 605 606 // Allocate new buffer and initialize. 607 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal); 608 info->dls_size = info_sz.dls_size; 609 info->dls_cnt = info_sz.dls_cnt; 610 611 // Obtain search path information. 612 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) { 613 FREE_C_HEAP_ARRAY(char, buf); 614 FREE_C_HEAP_ARRAY(char, info); 615 vm_exit_during_initialization("dlinfo SERINFO request", dlerror()); 616 } 617 618 path = &info->dls_serpath[0]; 619 620 // Note: Due to a legacy implementation, most of the library path 621 // is set in the launcher. This was to accomodate linking restrictions 622 // on legacy Solaris implementations (which are no longer supported). 623 // Eventually, all the library path setting will be done here. 624 // 625 // However, to prevent the proliferation of improperly built native 626 // libraries, the new path component /usr/jdk/packages is added here. 627 628 // Determine the actual CPU architecture. 629 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 630#ifdef _LP64 631 // If we are a 64-bit vm, perform the following translations: 632 // sparc -> sparcv9 633 // i386 -> amd64 634 if (strcmp(cpu_arch, "sparc") == 0) { 635 strcat(cpu_arch, "v9"); 636 } else if (strcmp(cpu_arch, "i386") == 0) { 637 strcpy(cpu_arch, "amd64"); 638 } 639#endif 640 641 // Construct the invariant part of ld_library_path. 642 sprintf(common_path, SYS_EXT_DIR "/lib/%s", cpu_arch); 643 644 // Struct size is more than sufficient for the path components obtained 645 // through the dlinfo() call, so only add additional space for the path 646 // components explicitly added here. 647 size_t library_path_size = info->dls_size + strlen(common_path); 648 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal); 649 library_path[0] = '\0'; 650 651 // Construct the desired Java library path from the linker's library 652 // search path. 653 // 654 // For compatibility, it is optimal that we insert the additional path 655 // components specific to the Java VM after those components specified 656 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so 657 // infrastructure. 658 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it. 659 strcpy(library_path, common_path); 660 } else { 661 int inserted = 0; 662 int i; 663 for (i = 0; i < info->dls_cnt; i++, path++) { 664 uint_t flags = path->dls_flags & LA_SER_MASK; 665 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) { 666 strcat(library_path, common_path); 667 strcat(library_path, os::path_separator()); 668 inserted = 1; 669 } 670 strcat(library_path, path->dls_name); 671 strcat(library_path, os::path_separator()); 672 } 673 // Eliminate trailing path separator. 674 library_path[strlen(library_path)-1] = '\0'; 675 } 676 677 // happens before argument parsing - can't use a trace flag 678 // tty->print_raw("init_system_properties_values: native lib path: "); 679 // tty->print_raw_cr(library_path); 680 681 // Callee copies into its own buffer. 682 Arguments::set_library_path(library_path); 683 684 FREE_C_HEAP_ARRAY(char, library_path); 685 FREE_C_HEAP_ARRAY(char, info); 686 } 687 688 // Extensions directories. 689 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); 690 Arguments::set_ext_dirs(buf); 691 692 FREE_C_HEAP_ARRAY(char, buf); 693 694#undef SYS_EXT_DIR 695#undef EXTENSIONS_DIR 696} 697 698void os::breakpoint() { 699 BREAKPOINT; 700} 701 702bool os::obsolete_option(const JavaVMOption *option) { 703 if (!strncmp(option->optionString, "-Xt", 3)) { 704 return true; 705 } else if (!strncmp(option->optionString, "-Xtm", 4)) { 706 return true; 707 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) { 708 return true; 709 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) { 710 return true; 711 } 712 return false; 713} 714 715bool os::Solaris::valid_stack_address(Thread* thread, address sp) { 716 address stackStart = (address)thread->stack_base(); 717 address stackEnd = (address)(stackStart - (address)thread->stack_size()); 718 if (sp < stackStart && sp >= stackEnd) return true; 719 return false; 720} 721 722extern "C" void breakpoint() { 723 // use debugger to set breakpoint here 724} 725 726static thread_t main_thread; 727 728// Thread start routine for all newly created threads 729extern "C" void* thread_native_entry(void* thread_addr) { 730 // Try to randomize the cache line index of hot stack frames. 731 // This helps when threads of the same stack traces evict each other's 732 // cache lines. The threads can be either from the same JVM instance, or 733 // from different JVM instances. The benefit is especially true for 734 // processors with hyperthreading technology. 735 static int counter = 0; 736 int pid = os::current_process_id(); 737 alloca(((pid ^ counter++) & 7) * 128); 738 739 int prio; 740 Thread* thread = (Thread*)thread_addr; 741 742 thread->initialize_thread_current(); 743 744 OSThread* osthr = thread->osthread(); 745 746 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound 747 thread->_schedctl = (void *) schedctl_init(); 748 749 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", 750 os::current_thread_id()); 751 752 if (UseNUMA) { 753 int lgrp_id = os::numa_get_group_id(); 754 if (lgrp_id != -1) { 755 thread->set_lgrp_id(lgrp_id); 756 } 757 } 758 759 // Our priority was set when we were created, and stored in the 760 // osthread, but couldn't be passed through to our LWP until now. 761 // So read back the priority and set it again. 762 763 if (osthr->thread_id() != -1) { 764 if (UseThreadPriorities) { 765 int prio = osthr->native_priority(); 766 if (ThreadPriorityVerbose) { 767 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " 768 INTPTR_FORMAT ", setting priority: %d\n", 769 osthr->thread_id(), osthr->lwp_id(), prio); 770 } 771 os::set_native_priority(thread, prio); 772 } 773 } else if (ThreadPriorityVerbose) { 774 warning("Can't set priority in _start routine, thread id hasn't been set\n"); 775 } 776 777 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 778 779 // initialize signal mask for this thread 780 os::Solaris::hotspot_sigmask(thread); 781 782 thread->run(); 783 784 // One less thread is executing 785 // When the VMThread gets here, the main thread may have already exited 786 // which frees the CodeHeap containing the Atomic::dec code 787 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 788 Atomic::dec(&os::Solaris::_os_thread_count); 789 } 790 791 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id()); 792 793 // If a thread has not deleted itself ("delete this") as part of its 794 // termination sequence, we have to ensure thread-local-storage is 795 // cleared before we actually terminate. No threads should ever be 796 // deleted asynchronously with respect to their termination. 797 if (Thread::current_or_null_safe() != NULL) { 798 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 799 thread->clear_thread_current(); 800 } 801 802 if (UseDetachedThreads) { 803 thr_exit(NULL); 804 ShouldNotReachHere(); 805 } 806 return NULL; 807} 808 809static OSThread* create_os_thread(Thread* thread, thread_t thread_id) { 810 // Allocate the OSThread object 811 OSThread* osthread = new OSThread(NULL, NULL); 812 if (osthread == NULL) return NULL; 813 814 // Store info on the Solaris thread into the OSThread 815 osthread->set_thread_id(thread_id); 816 osthread->set_lwp_id(_lwp_self()); 817 thread->_schedctl = (void *) schedctl_init(); 818 819 if (UseNUMA) { 820 int lgrp_id = os::numa_get_group_id(); 821 if (lgrp_id != -1) { 822 thread->set_lgrp_id(lgrp_id); 823 } 824 } 825 826 if (ThreadPriorityVerbose) { 827 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n", 828 osthread->thread_id(), osthread->lwp_id()); 829 } 830 831 // Initial thread state is INITIALIZED, not SUSPENDED 832 osthread->set_state(INITIALIZED); 833 834 return osthread; 835} 836 837void os::Solaris::hotspot_sigmask(Thread* thread) { 838 //Save caller's signal mask 839 sigset_t sigmask; 840 pthread_sigmask(SIG_SETMASK, NULL, &sigmask); 841 OSThread *osthread = thread->osthread(); 842 osthread->set_caller_sigmask(sigmask); 843 844 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL); 845 if (!ReduceSignalUsage) { 846 if (thread->is_VM_thread()) { 847 // Only the VM thread handles BREAK_SIGNAL ... 848 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 849 } else { 850 // ... all other threads block BREAK_SIGNAL 851 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked"); 852 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 853 } 854 } 855} 856 857bool os::create_attached_thread(JavaThread* thread) { 858#ifdef ASSERT 859 thread->verify_not_published(); 860#endif 861 OSThread* osthread = create_os_thread(thread, thr_self()); 862 if (osthread == NULL) { 863 return false; 864 } 865 866 // Initial thread state is RUNNABLE 867 osthread->set_state(RUNNABLE); 868 thread->set_osthread(osthread); 869 870 // initialize signal mask for this thread 871 // and save the caller's signal mask 872 os::Solaris::hotspot_sigmask(thread); 873 874 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").", 875 os::current_thread_id()); 876 877 return true; 878} 879 880bool os::create_main_thread(JavaThread* thread) { 881#ifdef ASSERT 882 thread->verify_not_published(); 883#endif 884 if (_starting_thread == NULL) { 885 _starting_thread = create_os_thread(thread, main_thread); 886 if (_starting_thread == NULL) { 887 return false; 888 } 889 } 890 891 // The primodial thread is runnable from the start 892 _starting_thread->set_state(RUNNABLE); 893 894 thread->set_osthread(_starting_thread); 895 896 // initialize signal mask for this thread 897 // and save the caller's signal mask 898 os::Solaris::hotspot_sigmask(thread); 899 900 return true; 901} 902 903// Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr() 904static char* describe_thr_create_attributes(char* buf, size_t buflen, 905 size_t stacksize, long flags) { 906 stringStream ss(buf, buflen); 907 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024); 908 ss.print("flags: "); 909 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " "); 910 #define ALL(X) \ 911 X(THR_SUSPENDED) \ 912 X(THR_DETACHED) \ 913 X(THR_BOUND) \ 914 X(THR_NEW_LWP) \ 915 X(THR_DAEMON) 916 ALL(PRINT_FLAG) 917 #undef ALL 918 #undef PRINT_FLAG 919 return buf; 920} 921 922bool os::create_thread(Thread* thread, ThreadType thr_type, 923 size_t stack_size) { 924 // Allocate the OSThread object 925 OSThread* osthread = new OSThread(NULL, NULL); 926 if (osthread == NULL) { 927 return false; 928 } 929 930 if (ThreadPriorityVerbose) { 931 char *thrtyp; 932 switch (thr_type) { 933 case vm_thread: 934 thrtyp = (char *)"vm"; 935 break; 936 case cgc_thread: 937 thrtyp = (char *)"cgc"; 938 break; 939 case pgc_thread: 940 thrtyp = (char *)"pgc"; 941 break; 942 case java_thread: 943 thrtyp = (char *)"java"; 944 break; 945 case compiler_thread: 946 thrtyp = (char *)"compiler"; 947 break; 948 case watcher_thread: 949 thrtyp = (char *)"watcher"; 950 break; 951 default: 952 thrtyp = (char *)"unknown"; 953 break; 954 } 955 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp); 956 } 957 958 // Calculate stack size if it's not specified by caller. 959 if (stack_size == 0) { 960 // The default stack size 1M (2M for LP64). 961 stack_size = (BytesPerWord >> 2) * K * K; 962 963 switch (thr_type) { 964 case os::java_thread: 965 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 966 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create(); 967 break; 968 case os::compiler_thread: 969 if (CompilerThreadStackSize > 0) { 970 stack_size = (size_t)(CompilerThreadStackSize * K); 971 break; 972 } // else fall through: 973 // use VMThreadStackSize if CompilerThreadStackSize is not defined 974 case os::vm_thread: 975 case os::pgc_thread: 976 case os::cgc_thread: 977 case os::watcher_thread: 978 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 979 break; 980 } 981 } 982 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed); 983 984 // Initial state is ALLOCATED but not INITIALIZED 985 osthread->set_state(ALLOCATED); 986 987 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) { 988 // We got lots of threads. Check if we still have some address space left. 989 // Need to be at least 5Mb of unreserved address space. We do check by 990 // trying to reserve some. 991 const size_t VirtualMemoryBangSize = 20*K*K; 992 char* mem = os::reserve_memory(VirtualMemoryBangSize); 993 if (mem == NULL) { 994 delete osthread; 995 return false; 996 } else { 997 // Release the memory again 998 os::release_memory(mem, VirtualMemoryBangSize); 999 } 1000 } 1001 1002 // Setup osthread because the child thread may need it. 1003 thread->set_osthread(osthread); 1004 1005 // Create the Solaris thread 1006 thread_t tid = 0; 1007 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED; 1008 int status; 1009 1010 // Mark that we don't have an lwp or thread id yet. 1011 // In case we attempt to set the priority before the thread starts. 1012 osthread->set_lwp_id(-1); 1013 osthread->set_thread_id(-1); 1014 1015 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid); 1016 1017 char buf[64]; 1018 if (status == 0) { 1019 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ", 1020 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 1021 } else { 1022 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.", 1023 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 1024 } 1025 1026 if (status != 0) { 1027 thread->set_osthread(NULL); 1028 // Need to clean up stuff we've allocated so far 1029 delete osthread; 1030 return false; 1031 } 1032 1033 Atomic::inc(&os::Solaris::_os_thread_count); 1034 1035 // Store info on the Solaris thread into the OSThread 1036 osthread->set_thread_id(tid); 1037 1038 // Remember that we created this thread so we can set priority on it 1039 osthread->set_vm_created(); 1040 1041 // Most thread types will set an explicit priority before starting the thread, 1042 // but for those that don't we need a valid value to read back in thread_native_entry. 1043 osthread->set_native_priority(NormPriority); 1044 1045 // Initial thread state is INITIALIZED, not SUSPENDED 1046 osthread->set_state(INITIALIZED); 1047 1048 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 1049 return true; 1050} 1051 1052// defined for >= Solaris 10. This allows builds on earlier versions 1053// of Solaris to take advantage of the newly reserved Solaris JVM signals. 1054// With SIGJVM1, SIGJVM2, ASYNC_SIGNAL is SIGJVM2. Previously INTERRUPT_SIGNAL 1055// was SIGJVM1. 1056// 1057#if !defined(SIGJVM1) 1058 #define SIGJVM1 39 1059 #define SIGJVM2 40 1060#endif 1061 1062debug_only(static bool signal_sets_initialized = false); 1063static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 1064 1065int os::Solaris::_SIGasync = ASYNC_SIGNAL; 1066 1067bool os::Solaris::is_sig_ignored(int sig) { 1068 struct sigaction oact; 1069 sigaction(sig, (struct sigaction*)NULL, &oact); 1070 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 1071 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 1072 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) { 1073 return true; 1074 } else { 1075 return false; 1076 } 1077} 1078 1079// Note: SIGRTMIN is a macro that calls sysconf() so it will 1080// dynamically detect SIGRTMIN value for the system at runtime, not buildtime 1081static bool isJVM1available() { 1082 return SIGJVM1 < SIGRTMIN; 1083} 1084 1085void os::Solaris::signal_sets_init() { 1086 // Should also have an assertion stating we are still single-threaded. 1087 assert(!signal_sets_initialized, "Already initialized"); 1088 // Fill in signals that are necessarily unblocked for all threads in 1089 // the VM. Currently, we unblock the following signals: 1090 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 1091 // by -Xrs (=ReduceSignalUsage)); 1092 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 1093 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 1094 // the dispositions or masks wrt these signals. 1095 // Programs embedding the VM that want to use the above signals for their 1096 // own purposes must, at this time, use the "-Xrs" option to prevent 1097 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 1098 // (See bug 4345157, and other related bugs). 1099 // In reality, though, unblocking these signals is really a nop, since 1100 // these signals are not blocked by default. 1101 sigemptyset(&unblocked_sigs); 1102 sigemptyset(&allowdebug_blocked_sigs); 1103 sigaddset(&unblocked_sigs, SIGILL); 1104 sigaddset(&unblocked_sigs, SIGSEGV); 1105 sigaddset(&unblocked_sigs, SIGBUS); 1106 sigaddset(&unblocked_sigs, SIGFPE); 1107 1108 // Always true on Solaris 10+ 1109 guarantee(isJVM1available(), "SIGJVM1/2 missing!"); 1110 os::Solaris::set_SIGasync(SIGJVM2); 1111 1112 sigaddset(&unblocked_sigs, os::Solaris::SIGasync()); 1113 1114 if (!ReduceSignalUsage) { 1115 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 1116 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 1117 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 1118 } 1119 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 1120 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 1121 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 1122 } 1123 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 1124 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 1125 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 1126 } 1127 } 1128 // Fill in signals that are blocked by all but the VM thread. 1129 sigemptyset(&vm_sigs); 1130 if (!ReduceSignalUsage) { 1131 sigaddset(&vm_sigs, BREAK_SIGNAL); 1132 } 1133 debug_only(signal_sets_initialized = true); 1134 1135 // For diagnostics only used in run_periodic_checks 1136 sigemptyset(&check_signal_done); 1137} 1138 1139// These are signals that are unblocked while a thread is running Java. 1140// (For some reason, they get blocked by default.) 1141sigset_t* os::Solaris::unblocked_signals() { 1142 assert(signal_sets_initialized, "Not initialized"); 1143 return &unblocked_sigs; 1144} 1145 1146// These are the signals that are blocked while a (non-VM) thread is 1147// running Java. Only the VM thread handles these signals. 1148sigset_t* os::Solaris::vm_signals() { 1149 assert(signal_sets_initialized, "Not initialized"); 1150 return &vm_sigs; 1151} 1152 1153// These are signals that are blocked during cond_wait to allow debugger in 1154sigset_t* os::Solaris::allowdebug_blocked_signals() { 1155 assert(signal_sets_initialized, "Not initialized"); 1156 return &allowdebug_blocked_sigs; 1157} 1158 1159 1160void _handle_uncaught_cxx_exception() { 1161 VMError::report_and_die("An uncaught C++ exception"); 1162} 1163 1164 1165// First crack at OS-specific initialization, from inside the new thread. 1166void os::initialize_thread(Thread* thr) { 1167 int r = thr_main(); 1168 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 1169 if (r) { 1170 JavaThread* jt = (JavaThread *)thr; 1171 assert(jt != NULL, "Sanity check"); 1172 size_t stack_size; 1173 address base = jt->stack_base(); 1174 if (Arguments::created_by_java_launcher()) { 1175 // Use 2MB to allow for Solaris 7 64 bit mode. 1176 stack_size = JavaThread::stack_size_at_create() == 0 1177 ? 2048*K : JavaThread::stack_size_at_create(); 1178 1179 // There are rare cases when we may have already used more than 1180 // the basic stack size allotment before this method is invoked. 1181 // Attempt to allow for a normally sized java_stack. 1182 size_t current_stack_offset = (size_t)(base - (address)&stack_size); 1183 stack_size += ReservedSpace::page_align_size_down(current_stack_offset); 1184 } else { 1185 // 6269555: If we were not created by a Java launcher, i.e. if we are 1186 // running embedded in a native application, treat the primordial thread 1187 // as much like a native attached thread as possible. This means using 1188 // the current stack size from thr_stksegment(), unless it is too large 1189 // to reliably setup guard pages. A reasonable max size is 8MB. 1190 size_t current_size = current_stack_size(); 1191 // This should never happen, but just in case.... 1192 if (current_size == 0) current_size = 2 * K * K; 1193 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size; 1194 } 1195 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());; 1196 stack_size = (size_t)(base - bottom); 1197 1198 assert(stack_size > 0, "Stack size calculation problem"); 1199 1200 if (stack_size > jt->stack_size()) { 1201#ifndef PRODUCT 1202 struct rlimit limits; 1203 getrlimit(RLIMIT_STACK, &limits); 1204 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur); 1205 assert(size >= jt->stack_size(), "Stack size problem in main thread"); 1206#endif 1207 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n" 1208 "(Stack sizes are rounded up to a multiple of the system page size.)\n" 1209 "See limit(1) to increase the stack size limit.", 1210 stack_size / K, jt->stack_size() / K); 1211 vm_exit(1); 1212 } 1213 assert(jt->stack_size() >= stack_size, 1214 "Attempt to map more stack than was allocated"); 1215 jt->set_stack_size(stack_size); 1216 } 1217 1218 // With the T2 libthread (T1 is no longer supported) threads are always bound 1219 // and we use stackbanging in all cases. 1220 1221 os::Solaris::init_thread_fpu_state(); 1222 std::set_terminate(_handle_uncaught_cxx_exception); 1223} 1224 1225 1226 1227// Free Solaris resources related to the OSThread 1228void os::free_thread(OSThread* osthread) { 1229 assert(osthread != NULL, "os::free_thread but osthread not set"); 1230 1231 // We are told to free resources of the argument thread, 1232 // but we can only really operate on the current thread. 1233 assert(Thread::current()->osthread() == osthread, 1234 "os::free_thread but not current thread"); 1235 1236 // Restore caller's signal mask 1237 sigset_t sigmask = osthread->caller_sigmask(); 1238 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 1239 1240 delete osthread; 1241} 1242 1243void os::pd_start_thread(Thread* thread) { 1244 int status = thr_continue(thread->osthread()->thread_id()); 1245 assert_status(status == 0, status, "thr_continue failed"); 1246} 1247 1248 1249intx os::current_thread_id() { 1250 return (intx)thr_self(); 1251} 1252 1253static pid_t _initial_pid = 0; 1254 1255int os::current_process_id() { 1256 return (int)(_initial_pid ? _initial_pid : getpid()); 1257} 1258 1259// gethrtime() should be monotonic according to the documentation, 1260// but some virtualized platforms are known to break this guarantee. 1261// getTimeNanos() must be guaranteed not to move backwards, so we 1262// are forced to add a check here. 1263inline hrtime_t getTimeNanos() { 1264 const hrtime_t now = gethrtime(); 1265 const hrtime_t prev = max_hrtime; 1266 if (now <= prev) { 1267 return prev; // same or retrograde time; 1268 } 1269 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev); 1270 assert(obsv >= prev, "invariant"); // Monotonicity 1271 // If the CAS succeeded then we're done and return "now". 1272 // If the CAS failed and the observed value "obsv" is >= now then 1273 // we should return "obsv". If the CAS failed and now > obsv > prv then 1274 // some other thread raced this thread and installed a new value, in which case 1275 // we could either (a) retry the entire operation, (b) retry trying to install now 1276 // or (c) just return obsv. We use (c). No loop is required although in some cases 1277 // we might discard a higher "now" value in deference to a slightly lower but freshly 1278 // installed obsv value. That's entirely benign -- it admits no new orderings compared 1279 // to (a) or (b) -- and greatly reduces coherence traffic. 1280 // We might also condition (c) on the magnitude of the delta between obsv and now. 1281 // Avoiding excessive CAS operations to hot RW locations is critical. 1282 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 1283 return (prev == obsv) ? now : obsv; 1284} 1285 1286// Time since start-up in seconds to a fine granularity. 1287// Used by VMSelfDestructTimer and the MemProfiler. 1288double os::elapsedTime() { 1289 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1290} 1291 1292jlong os::elapsed_counter() { 1293 return (jlong)(getTimeNanos() - first_hrtime); 1294} 1295 1296jlong os::elapsed_frequency() { 1297 return hrtime_hz; 1298} 1299 1300// Return the real, user, and system times in seconds from an 1301// arbitrary fixed point in the past. 1302bool os::getTimesSecs(double* process_real_time, 1303 double* process_user_time, 1304 double* process_system_time) { 1305 struct tms ticks; 1306 clock_t real_ticks = times(&ticks); 1307 1308 if (real_ticks == (clock_t) (-1)) { 1309 return false; 1310 } else { 1311 double ticks_per_second = (double) clock_tics_per_sec; 1312 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1313 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1314 // For consistency return the real time from getTimeNanos() 1315 // converted to seconds. 1316 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); 1317 1318 return true; 1319 } 1320} 1321 1322bool os::supports_vtime() { return true; } 1323 1324bool os::enable_vtime() { 1325 int fd = ::open("/proc/self/ctl", O_WRONLY); 1326 if (fd == -1) { 1327 return false; 1328 } 1329 1330 long cmd[] = { PCSET, PR_MSACCT }; 1331 int res = ::write(fd, cmd, sizeof(long) * 2); 1332 ::close(fd); 1333 if (res != sizeof(long) * 2) { 1334 return false; 1335 } 1336 return true; 1337} 1338 1339bool os::vtime_enabled() { 1340 int fd = ::open("/proc/self/status", O_RDONLY); 1341 if (fd == -1) { 1342 return false; 1343 } 1344 1345 pstatus_t status; 1346 int res = os::read(fd, (void*) &status, sizeof(pstatus_t)); 1347 ::close(fd); 1348 if (res != sizeof(pstatus_t)) { 1349 return false; 1350 } 1351 return status.pr_flags & PR_MSACCT; 1352} 1353 1354double os::elapsedVTime() { 1355 return (double)gethrvtime() / (double)hrtime_hz; 1356} 1357 1358// in-memory timestamp support - has update accuracy of 1ms 1359typedef void (*_get_nsec_fromepoch_func_t)(hrtime_t*); 1360static _get_nsec_fromepoch_func_t _get_nsec_fromepoch = NULL; 1361 1362// Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 1363jlong os::javaTimeMillis() { 1364 if (_get_nsec_fromepoch != NULL) { 1365 hrtime_t now; 1366 _get_nsec_fromepoch(&now); 1367 return now / NANOSECS_PER_MILLISEC; 1368 } 1369 else { 1370 timeval t; 1371 if (gettimeofday(&t, NULL) == -1) { 1372 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno)); 1373 } 1374 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; 1375 } 1376} 1377 1378void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 1379 timeval t; 1380 // can't use get_nsec_fromepoch here as we need better accuracy than 1ms 1381 if (gettimeofday(&t, NULL) == -1) { 1382 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno)); 1383 } 1384 seconds = jlong(t.tv_sec); 1385 nanos = jlong(t.tv_usec) * 1000; 1386} 1387 1388 1389jlong os::javaTimeNanos() { 1390 return (jlong)getTimeNanos(); 1391} 1392 1393void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1394 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits 1395 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1396 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1397 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1398} 1399 1400char * os::local_time_string(char *buf, size_t buflen) { 1401 struct tm t; 1402 time_t long_time; 1403 time(&long_time); 1404 localtime_r(&long_time, &t); 1405 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1406 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1407 t.tm_hour, t.tm_min, t.tm_sec); 1408 return buf; 1409} 1410 1411// Note: os::shutdown() might be called very early during initialization, or 1412// called from signal handler. Before adding something to os::shutdown(), make 1413// sure it is async-safe and can handle partially initialized VM. 1414void os::shutdown() { 1415 1416 // allow PerfMemory to attempt cleanup of any persistent resources 1417 perfMemory_exit(); 1418 1419 // needs to remove object in file system 1420 AttachListener::abort(); 1421 1422 // flush buffered output, finish log files 1423 ostream_abort(); 1424 1425 // Check for abort hook 1426 abort_hook_t abort_hook = Arguments::abort_hook(); 1427 if (abort_hook != NULL) { 1428 abort_hook(); 1429 } 1430} 1431 1432// Note: os::abort() might be called very early during initialization, or 1433// called from signal handler. Before adding something to os::abort(), make 1434// sure it is async-safe and can handle partially initialized VM. 1435void os::abort(bool dump_core, void* siginfo, const void* context) { 1436 os::shutdown(); 1437 if (dump_core) { 1438#ifndef PRODUCT 1439 fdStream out(defaultStream::output_fd()); 1440 out.print_raw("Current thread is "); 1441 char buf[16]; 1442 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1443 out.print_raw_cr(buf); 1444 out.print_raw_cr("Dumping core ..."); 1445#endif 1446 ::abort(); // dump core (for debugging) 1447 } 1448 1449 ::exit(1); 1450} 1451 1452// Die immediately, no exit hook, no abort hook, no cleanup. 1453void os::die() { 1454 ::abort(); // dump core (for debugging) 1455} 1456 1457// DLL functions 1458 1459const char* os::dll_file_extension() { return ".so"; } 1460 1461// This must be hard coded because it's the system's temporary 1462// directory not the java application's temp directory, ala java.io.tmpdir. 1463const char* os::get_temp_directory() { return "/tmp"; } 1464 1465static bool file_exists(const char* filename) { 1466 struct stat statbuf; 1467 if (filename == NULL || strlen(filename) == 0) { 1468 return false; 1469 } 1470 return os::stat(filename, &statbuf) == 0; 1471} 1472 1473bool os::dll_build_name(char* buffer, size_t buflen, 1474 const char* pname, const char* fname) { 1475 bool retval = false; 1476 const size_t pnamelen = pname ? strlen(pname) : 0; 1477 1478 // Return error on buffer overflow. 1479 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { 1480 return retval; 1481 } 1482 1483 if (pnamelen == 0) { 1484 snprintf(buffer, buflen, "lib%s.so", fname); 1485 retval = true; 1486 } else if (strchr(pname, *os::path_separator()) != NULL) { 1487 int n; 1488 char** pelements = split_path(pname, &n); 1489 if (pelements == NULL) { 1490 return false; 1491 } 1492 for (int i = 0; i < n; i++) { 1493 // really shouldn't be NULL but what the heck, check can't hurt 1494 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1495 continue; // skip the empty path values 1496 } 1497 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); 1498 if (file_exists(buffer)) { 1499 retval = true; 1500 break; 1501 } 1502 } 1503 // release the storage 1504 for (int i = 0; i < n; i++) { 1505 if (pelements[i] != NULL) { 1506 FREE_C_HEAP_ARRAY(char, pelements[i]); 1507 } 1508 } 1509 if (pelements != NULL) { 1510 FREE_C_HEAP_ARRAY(char*, pelements); 1511 } 1512 } else { 1513 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); 1514 retval = true; 1515 } 1516 return retval; 1517} 1518 1519// check if addr is inside libjvm.so 1520bool os::address_is_in_vm(address addr) { 1521 static address libjvm_base_addr; 1522 Dl_info dlinfo; 1523 1524 if (libjvm_base_addr == NULL) { 1525 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1526 libjvm_base_addr = (address)dlinfo.dli_fbase; 1527 } 1528 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1529 } 1530 1531 if (dladdr((void *)addr, &dlinfo) != 0) { 1532 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1533 } 1534 1535 return false; 1536} 1537 1538typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int); 1539static dladdr1_func_type dladdr1_func = NULL; 1540 1541bool os::dll_address_to_function_name(address addr, char *buf, 1542 int buflen, int * offset, 1543 bool demangle) { 1544 // buf is not optional, but offset is optional 1545 assert(buf != NULL, "sanity check"); 1546 1547 Dl_info dlinfo; 1548 1549 // dladdr1_func was initialized in os::init() 1550 if (dladdr1_func != NULL) { 1551 // yes, we have dladdr1 1552 1553 // Support for dladdr1 is checked at runtime; it may be 1554 // available even if the vm is built on a machine that does 1555 // not have dladdr1 support. Make sure there is a value for 1556 // RTLD_DL_SYMENT. 1557#ifndef RTLD_DL_SYMENT 1558 #define RTLD_DL_SYMENT 1 1559#endif 1560#ifdef _LP64 1561 Elf64_Sym * info; 1562#else 1563 Elf32_Sym * info; 1564#endif 1565 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1566 RTLD_DL_SYMENT) != 0) { 1567 // see if we have a matching symbol that covers our address 1568 if (dlinfo.dli_saddr != NULL && 1569 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) { 1570 if (dlinfo.dli_sname != NULL) { 1571 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1572 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1573 } 1574 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1575 return true; 1576 } 1577 } 1578 // no matching symbol so try for just file info 1579 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1580 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1581 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1582 return true; 1583 } 1584 } 1585 } 1586 buf[0] = '\0'; 1587 if (offset != NULL) *offset = -1; 1588 return false; 1589 } 1590 1591 // no, only dladdr is available 1592 if (dladdr((void *)addr, &dlinfo) != 0) { 1593 // see if we have a matching symbol 1594 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1595 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1596 jio_snprintf(buf, buflen, dlinfo.dli_sname); 1597 } 1598 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1599 return true; 1600 } 1601 // no matching symbol so try for just file info 1602 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1603 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1604 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1605 return true; 1606 } 1607 } 1608 } 1609 buf[0] = '\0'; 1610 if (offset != NULL) *offset = -1; 1611 return false; 1612} 1613 1614bool os::dll_address_to_library_name(address addr, char* buf, 1615 int buflen, int* offset) { 1616 // buf is not optional, but offset is optional 1617 assert(buf != NULL, "sanity check"); 1618 1619 Dl_info dlinfo; 1620 1621 if (dladdr((void*)addr, &dlinfo) != 0) { 1622 if (dlinfo.dli_fname != NULL) { 1623 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1624 } 1625 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1626 *offset = addr - (address)dlinfo.dli_fbase; 1627 } 1628 return true; 1629 } 1630 1631 buf[0] = '\0'; 1632 if (offset) *offset = -1; 1633 return false; 1634} 1635 1636int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1637 Dl_info dli; 1638 // Sanity check? 1639 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 || 1640 dli.dli_fname == NULL) { 1641 return 1; 1642 } 1643 1644 void * handle = dlopen(dli.dli_fname, RTLD_LAZY); 1645 if (handle == NULL) { 1646 return 1; 1647 } 1648 1649 Link_map *map; 1650 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1651 if (map == NULL) { 1652 dlclose(handle); 1653 return 1; 1654 } 1655 1656 while (map->l_prev != NULL) { 1657 map = map->l_prev; 1658 } 1659 1660 while (map != NULL) { 1661 // Iterate through all map entries and call callback with fields of interest 1662 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1663 dlclose(handle); 1664 return 1; 1665 } 1666 map = map->l_next; 1667 } 1668 1669 dlclose(handle); 1670 return 0; 1671} 1672 1673int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1674 outputStream * out = (outputStream *) param; 1675 out->print_cr(PTR_FORMAT " \t%s", base_address, name); 1676 return 0; 1677} 1678 1679void os::print_dll_info(outputStream * st) { 1680 st->print_cr("Dynamic libraries:"); st->flush(); 1681 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1682 st->print_cr("Error: Cannot print dynamic libraries."); 1683 } 1684} 1685 1686// Loads .dll/.so and 1687// in case of error it checks if .dll/.so was built for the 1688// same architecture as Hotspot is running on 1689 1690void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1691 void * result= ::dlopen(filename, RTLD_LAZY); 1692 if (result != NULL) { 1693 // Successful loading 1694 return result; 1695 } 1696 1697 Elf32_Ehdr elf_head; 1698 1699 // Read system error message into ebuf 1700 // It may or may not be overwritten below 1701 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1702 ebuf[ebuflen-1]='\0'; 1703 int diag_msg_max_length=ebuflen-strlen(ebuf); 1704 char* diag_msg_buf=ebuf+strlen(ebuf); 1705 1706 if (diag_msg_max_length==0) { 1707 // No more space in ebuf for additional diagnostics message 1708 return NULL; 1709 } 1710 1711 1712 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1713 1714 if (file_descriptor < 0) { 1715 // Can't open library, report dlerror() message 1716 return NULL; 1717 } 1718 1719 bool failed_to_read_elf_head= 1720 (sizeof(elf_head)!= 1721 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1722 1723 ::close(file_descriptor); 1724 if (failed_to_read_elf_head) { 1725 // file i/o error - report dlerror() msg 1726 return NULL; 1727 } 1728 1729 typedef struct { 1730 Elf32_Half code; // Actual value as defined in elf.h 1731 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1732 char elf_class; // 32 or 64 bit 1733 char endianess; // MSB or LSB 1734 char* name; // String representation 1735 } arch_t; 1736 1737 static const arch_t arch_array[]={ 1738 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1739 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1740 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1741 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1742 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1743 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1744 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1745 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1746 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1747 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"} 1748 }; 1749 1750#if (defined IA32) 1751 static Elf32_Half running_arch_code=EM_386; 1752#elif (defined AMD64) 1753 static Elf32_Half running_arch_code=EM_X86_64; 1754#elif (defined IA64) 1755 static Elf32_Half running_arch_code=EM_IA_64; 1756#elif (defined __sparc) && (defined _LP64) 1757 static Elf32_Half running_arch_code=EM_SPARCV9; 1758#elif (defined __sparc) && (!defined _LP64) 1759 static Elf32_Half running_arch_code=EM_SPARC; 1760#elif (defined __powerpc64__) 1761 static Elf32_Half running_arch_code=EM_PPC64; 1762#elif (defined __powerpc__) 1763 static Elf32_Half running_arch_code=EM_PPC; 1764#elif (defined ARM) 1765 static Elf32_Half running_arch_code=EM_ARM; 1766#else 1767 #error Method os::dll_load requires that one of following is defined:\ 1768 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM 1769#endif 1770 1771 // Identify compatability class for VM's architecture and library's architecture 1772 // Obtain string descriptions for architectures 1773 1774 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1775 int running_arch_index=-1; 1776 1777 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1778 if (running_arch_code == arch_array[i].code) { 1779 running_arch_index = i; 1780 } 1781 if (lib_arch.code == arch_array[i].code) { 1782 lib_arch.compat_class = arch_array[i].compat_class; 1783 lib_arch.name = arch_array[i].name; 1784 } 1785 } 1786 1787 assert(running_arch_index != -1, 1788 "Didn't find running architecture code (running_arch_code) in arch_array"); 1789 if (running_arch_index == -1) { 1790 // Even though running architecture detection failed 1791 // we may still continue with reporting dlerror() message 1792 return NULL; 1793 } 1794 1795 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1796 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1797 return NULL; 1798 } 1799 1800 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1801 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1802 return NULL; 1803 } 1804 1805 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1806 if (lib_arch.name!=NULL) { 1807 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1808 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1809 lib_arch.name, arch_array[running_arch_index].name); 1810 } else { 1811 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1812 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1813 lib_arch.code, 1814 arch_array[running_arch_index].name); 1815 } 1816 } 1817 1818 return NULL; 1819} 1820 1821void* os::dll_lookup(void* handle, const char* name) { 1822 return dlsym(handle, name); 1823} 1824 1825void* os::get_default_process_handle() { 1826 return (void*)::dlopen(NULL, RTLD_LAZY); 1827} 1828 1829int os::stat(const char *path, struct stat *sbuf) { 1830 char pathbuf[MAX_PATH]; 1831 if (strlen(path) > MAX_PATH - 1) { 1832 errno = ENAMETOOLONG; 1833 return -1; 1834 } 1835 os::native_path(strcpy(pathbuf, path)); 1836 return ::stat(pathbuf, sbuf); 1837} 1838 1839static inline time_t get_mtime(const char* filename) { 1840 struct stat st; 1841 int ret = os::stat(filename, &st); 1842 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 1843 return st.st_mtime; 1844} 1845 1846int os::compare_file_modified_times(const char* file1, const char* file2) { 1847 time_t t1 = get_mtime(file1); 1848 time_t t2 = get_mtime(file2); 1849 return t1 - t2; 1850} 1851 1852static bool _print_ascii_file(const char* filename, outputStream* st) { 1853 int fd = ::open(filename, O_RDONLY); 1854 if (fd == -1) { 1855 return false; 1856 } 1857 1858 char buf[32]; 1859 int bytes; 1860 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1861 st->print_raw(buf, bytes); 1862 } 1863 1864 ::close(fd); 1865 1866 return true; 1867} 1868 1869void os::print_os_info_brief(outputStream* st) { 1870 os::Solaris::print_distro_info(st); 1871 1872 os::Posix::print_uname_info(st); 1873 1874 os::Solaris::print_libversion_info(st); 1875} 1876 1877void os::print_os_info(outputStream* st) { 1878 st->print("OS:"); 1879 1880 os::Solaris::print_distro_info(st); 1881 1882 os::Posix::print_uname_info(st); 1883 1884 os::Solaris::print_libversion_info(st); 1885 1886 os::Posix::print_rlimit_info(st); 1887 1888 os::Posix::print_load_average(st); 1889} 1890 1891void os::Solaris::print_distro_info(outputStream* st) { 1892 if (!_print_ascii_file("/etc/release", st)) { 1893 st->print("Solaris"); 1894 } 1895 st->cr(); 1896} 1897 1898void os::get_summary_os_info(char* buf, size_t buflen) { 1899 strncpy(buf, "Solaris", buflen); // default to plain solaris 1900 FILE* fp = fopen("/etc/release", "r"); 1901 if (fp != NULL) { 1902 char tmp[256]; 1903 // Only get the first line and chop out everything but the os name. 1904 if (fgets(tmp, sizeof(tmp), fp)) { 1905 char* ptr = tmp; 1906 // skip past whitespace characters 1907 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++; 1908 if (*ptr != '\0') { 1909 char* nl = strchr(ptr, '\n'); 1910 if (nl != NULL) *nl = '\0'; 1911 strncpy(buf, ptr, buflen); 1912 } 1913 } 1914 fclose(fp); 1915 } 1916} 1917 1918void os::Solaris::print_libversion_info(outputStream* st) { 1919 st->print(" (T2 libthread)"); 1920 st->cr(); 1921} 1922 1923static bool check_addr0(outputStream* st) { 1924 jboolean status = false; 1925 const int read_chunk = 200; 1926 int ret = 0; 1927 int nmap = 0; 1928 int fd = ::open("/proc/self/map",O_RDONLY); 1929 if (fd >= 0) { 1930 prmap_t *p = NULL; 1931 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t)); 1932 if (NULL == mbuff) { 1933 ::close(fd); 1934 return status; 1935 } 1936 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) { 1937 //check if read() has not read partial data 1938 if( 0 != ret % sizeof(prmap_t)){ 1939 break; 1940 } 1941 nmap = ret / sizeof(prmap_t); 1942 p = (prmap_t *)mbuff; 1943 for(int i = 0; i < nmap; i++){ 1944 if (p->pr_vaddr == 0x0) { 1945 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024); 1946 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname); 1947 st->print("Access: "); 1948 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-"); 1949 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-"); 1950 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-"); 1951 st->cr(); 1952 status = true; 1953 } 1954 p++; 1955 } 1956 } 1957 free(mbuff); 1958 ::close(fd); 1959 } 1960 return status; 1961} 1962 1963void os::get_summary_cpu_info(char* buf, size_t buflen) { 1964 // Get MHz with system call. We don't seem to already have this. 1965 processor_info_t stats; 1966 processorid_t id = getcpuid(); 1967 int clock = 0; 1968 if (processor_info(id, &stats) != -1) { 1969 clock = stats.pi_clock; // pi_processor_type isn't more informative than below 1970 } 1971#ifdef AMD64 1972 snprintf(buf, buflen, "x86 64 bit %d MHz", clock); 1973#else 1974 // must be sparc 1975 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock); 1976#endif 1977} 1978 1979void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1980 // Nothing to do for now. 1981} 1982 1983void os::print_memory_info(outputStream* st) { 1984 st->print("Memory:"); 1985 st->print(" %dk page", os::vm_page_size()>>10); 1986 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 1987 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 1988 st->cr(); 1989 (void) check_addr0(st); 1990} 1991 1992// Moved from whole group, because we need them here for diagnostic 1993// prints. 1994#define OLDMAXSIGNUM 32 1995static int Maxsignum = 0; 1996static int *ourSigFlags = NULL; 1997 1998int os::Solaris::get_our_sigflags(int sig) { 1999 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 2000 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 2001 return ourSigFlags[sig]; 2002} 2003 2004void os::Solaris::set_our_sigflags(int sig, int flags) { 2005 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 2006 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 2007 ourSigFlags[sig] = flags; 2008} 2009 2010 2011static const char* get_signal_handler_name(address handler, 2012 char* buf, int buflen) { 2013 int offset; 2014 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 2015 if (found) { 2016 // skip directory names 2017 const char *p1, *p2; 2018 p1 = buf; 2019 size_t len = strlen(os::file_separator()); 2020 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 2021 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 2022 } else { 2023 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 2024 } 2025 return buf; 2026} 2027 2028static void print_signal_handler(outputStream* st, int sig, 2029 char* buf, size_t buflen) { 2030 struct sigaction sa; 2031 2032 sigaction(sig, NULL, &sa); 2033 2034 st->print("%s: ", os::exception_name(sig, buf, buflen)); 2035 2036 address handler = (sa.sa_flags & SA_SIGINFO) 2037 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 2038 : CAST_FROM_FN_PTR(address, sa.sa_handler); 2039 2040 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 2041 st->print("SIG_DFL"); 2042 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 2043 st->print("SIG_IGN"); 2044 } else { 2045 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 2046 } 2047 2048 st->print(", sa_mask[0]="); 2049 os::Posix::print_signal_set_short(st, &sa.sa_mask); 2050 2051 address rh = VMError::get_resetted_sighandler(sig); 2052 // May be, handler was resetted by VMError? 2053 if (rh != NULL) { 2054 handler = rh; 2055 sa.sa_flags = VMError::get_resetted_sigflags(sig); 2056 } 2057 2058 st->print(", sa_flags="); 2059 os::Posix::print_sa_flags(st, sa.sa_flags); 2060 2061 // Check: is it our handler? 2062 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) { 2063 // It is our signal handler 2064 // check for flags 2065 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 2066 st->print( 2067 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 2068 os::Solaris::get_our_sigflags(sig)); 2069 } 2070 } 2071 st->cr(); 2072} 2073 2074void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 2075 st->print_cr("Signal Handlers:"); 2076 print_signal_handler(st, SIGSEGV, buf, buflen); 2077 print_signal_handler(st, SIGBUS , buf, buflen); 2078 print_signal_handler(st, SIGFPE , buf, buflen); 2079 print_signal_handler(st, SIGPIPE, buf, buflen); 2080 print_signal_handler(st, SIGXFSZ, buf, buflen); 2081 print_signal_handler(st, SIGILL , buf, buflen); 2082 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 2083 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 2084 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 2085 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 2086 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 2087 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen); 2088} 2089 2090static char saved_jvm_path[MAXPATHLEN] = { 0 }; 2091 2092// Find the full path to the current module, libjvm.so 2093void os::jvm_path(char *buf, jint buflen) { 2094 // Error checking. 2095 if (buflen < MAXPATHLEN) { 2096 assert(false, "must use a large-enough buffer"); 2097 buf[0] = '\0'; 2098 return; 2099 } 2100 // Lazy resolve the path to current module. 2101 if (saved_jvm_path[0] != 0) { 2102 strcpy(buf, saved_jvm_path); 2103 return; 2104 } 2105 2106 Dl_info dlinfo; 2107 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 2108 assert(ret != 0, "cannot locate libjvm"); 2109 if (ret != 0 && dlinfo.dli_fname != NULL) { 2110 realpath((char *)dlinfo.dli_fname, buf); 2111 } else { 2112 buf[0] = '\0'; 2113 return; 2114 } 2115 2116 if (Arguments::sun_java_launcher_is_altjvm()) { 2117 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 2118 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". 2119 // If "/jre/lib/" appears at the right place in the string, then 2120 // assume we are installed in a JDK and we're done. Otherwise, check 2121 // for a JAVA_HOME environment variable and fix up the path so it 2122 // looks like libjvm.so is installed there (append a fake suffix 2123 // hotspot/libjvm.so). 2124 const char *p = buf + strlen(buf) - 1; 2125 for (int count = 0; p > buf && count < 5; ++count) { 2126 for (--p; p > buf && *p != '/'; --p) 2127 /* empty */ ; 2128 } 2129 2130 if (strncmp(p, "/jre/lib/", 9) != 0) { 2131 // Look for JAVA_HOME in the environment. 2132 char* java_home_var = ::getenv("JAVA_HOME"); 2133 if (java_home_var != NULL && java_home_var[0] != 0) { 2134 char cpu_arch[12]; 2135 char* jrelib_p; 2136 int len; 2137 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 2138#ifdef _LP64 2139 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9. 2140 if (strcmp(cpu_arch, "sparc") == 0) { 2141 strcat(cpu_arch, "v9"); 2142 } else if (strcmp(cpu_arch, "i386") == 0) { 2143 strcpy(cpu_arch, "amd64"); 2144 } 2145#endif 2146 // Check the current module name "libjvm.so". 2147 p = strrchr(buf, '/'); 2148 assert(strstr(p, "/libjvm") == p, "invalid library name"); 2149 2150 realpath(java_home_var, buf); 2151 // determine if this is a legacy image or modules image 2152 // modules image doesn't have "jre" subdirectory 2153 len = strlen(buf); 2154 assert(len < buflen, "Ran out of buffer space"); 2155 jrelib_p = buf + len; 2156 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); 2157 if (0 != access(buf, F_OK)) { 2158 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); 2159 } 2160 2161 if (0 == access(buf, F_OK)) { 2162 // Use current module name "libjvm.so" 2163 len = strlen(buf); 2164 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 2165 } else { 2166 // Go back to path of .so 2167 realpath((char *)dlinfo.dli_fname, buf); 2168 } 2169 } 2170 } 2171 } 2172 2173 strncpy(saved_jvm_path, buf, MAXPATHLEN); 2174 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 2175} 2176 2177 2178void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2179 // no prefix required, not even "_" 2180} 2181 2182 2183void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2184 // no suffix required 2185} 2186 2187// This method is a copy of JDK's sysGetLastErrorString 2188// from src/solaris/hpi/src/system_md.c 2189 2190size_t os::lasterror(char *buf, size_t len) { 2191 if (errno == 0) return 0; 2192 2193 const char *s = os::strerror(errno); 2194 size_t n = ::strlen(s); 2195 if (n >= len) { 2196 n = len - 1; 2197 } 2198 ::strncpy(buf, s, n); 2199 buf[n] = '\0'; 2200 return n; 2201} 2202 2203 2204// sun.misc.Signal 2205 2206extern "C" { 2207 static void UserHandler(int sig, void *siginfo, void *context) { 2208 // Ctrl-C is pressed during error reporting, likely because the error 2209 // handler fails to abort. Let VM die immediately. 2210 if (sig == SIGINT && is_error_reported()) { 2211 os::die(); 2212 } 2213 2214 os::signal_notify(sig); 2215 // We do not need to reinstate the signal handler each time... 2216 } 2217} 2218 2219void* os::user_handler() { 2220 return CAST_FROM_FN_PTR(void*, UserHandler); 2221} 2222 2223struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) { 2224 struct timespec ts; 2225 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 2226 2227 return ts; 2228} 2229 2230extern "C" { 2231 typedef void (*sa_handler_t)(int); 2232 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2233} 2234 2235void* os::signal(int signal_number, void* handler) { 2236 struct sigaction sigAct, oldSigAct; 2237 sigfillset(&(sigAct.sa_mask)); 2238 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 2239 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2240 2241 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 2242 // -1 means registration failed 2243 return (void *)-1; 2244 } 2245 2246 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2247} 2248 2249void os::signal_raise(int signal_number) { 2250 raise(signal_number); 2251} 2252 2253// The following code is moved from os.cpp for making this 2254// code platform specific, which it is by its very nature. 2255 2256// a counter for each possible signal value 2257static int Sigexit = 0; 2258static int Maxlibjsigsigs; 2259static jint *pending_signals = NULL; 2260static int *preinstalled_sigs = NULL; 2261static struct sigaction *chainedsigactions = NULL; 2262static sema_t sig_sem; 2263typedef int (*version_getting_t)(); 2264version_getting_t os::Solaris::get_libjsig_version = NULL; 2265static int libjsigversion = NULL; 2266 2267int os::sigexitnum_pd() { 2268 assert(Sigexit > 0, "signal memory not yet initialized"); 2269 return Sigexit; 2270} 2271 2272void os::Solaris::init_signal_mem() { 2273 // Initialize signal structures 2274 Maxsignum = SIGRTMAX; 2275 Sigexit = Maxsignum+1; 2276 assert(Maxsignum >0, "Unable to obtain max signal number"); 2277 2278 Maxlibjsigsigs = Maxsignum; 2279 2280 // pending_signals has one int per signal 2281 // The additional signal is for SIGEXIT - exit signal to signal_thread 2282 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); 2283 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 2284 2285 if (UseSignalChaining) { 2286 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 2287 * (Maxsignum + 1), mtInternal); 2288 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 2289 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2290 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 2291 } 2292 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2293 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 2294} 2295 2296void os::signal_init_pd() { 2297 int ret; 2298 2299 ret = ::sema_init(&sig_sem, 0, NULL, NULL); 2300 assert(ret == 0, "sema_init() failed"); 2301} 2302 2303void os::signal_notify(int signal_number) { 2304 int ret; 2305 2306 Atomic::inc(&pending_signals[signal_number]); 2307 ret = ::sema_post(&sig_sem); 2308 assert(ret == 0, "sema_post() failed"); 2309} 2310 2311static int check_pending_signals(bool wait_for_signal) { 2312 int ret; 2313 while (true) { 2314 for (int i = 0; i < Sigexit + 1; i++) { 2315 jint n = pending_signals[i]; 2316 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2317 return i; 2318 } 2319 } 2320 if (!wait_for_signal) { 2321 return -1; 2322 } 2323 JavaThread *thread = JavaThread::current(); 2324 ThreadBlockInVM tbivm(thread); 2325 2326 bool threadIsSuspended; 2327 do { 2328 thread->set_suspend_equivalent(); 2329 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2330 while ((ret = ::sema_wait(&sig_sem)) == EINTR) 2331 ; 2332 assert(ret == 0, "sema_wait() failed"); 2333 2334 // were we externally suspended while we were waiting? 2335 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2336 if (threadIsSuspended) { 2337 // The semaphore has been incremented, but while we were waiting 2338 // another thread suspended us. We don't want to continue running 2339 // while suspended because that would surprise the thread that 2340 // suspended us. 2341 ret = ::sema_post(&sig_sem); 2342 assert(ret == 0, "sema_post() failed"); 2343 2344 thread->java_suspend_self(); 2345 } 2346 } while (threadIsSuspended); 2347 } 2348} 2349 2350int os::signal_lookup() { 2351 return check_pending_signals(false); 2352} 2353 2354int os::signal_wait() { 2355 return check_pending_signals(true); 2356} 2357 2358//////////////////////////////////////////////////////////////////////////////// 2359// Virtual Memory 2360 2361static int page_size = -1; 2362 2363// The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will 2364// clear this var if support is not available. 2365static bool has_map_align = true; 2366 2367int os::vm_page_size() { 2368 assert(page_size != -1, "must call os::init"); 2369 return page_size; 2370} 2371 2372// Solaris allocates memory by pages. 2373int os::vm_allocation_granularity() { 2374 assert(page_size != -1, "must call os::init"); 2375 return page_size; 2376} 2377 2378static bool recoverable_mmap_error(int err) { 2379 // See if the error is one we can let the caller handle. This 2380 // list of errno values comes from the Solaris mmap(2) man page. 2381 switch (err) { 2382 case EBADF: 2383 case EINVAL: 2384 case ENOTSUP: 2385 // let the caller deal with these errors 2386 return true; 2387 2388 default: 2389 // Any remaining errors on this OS can cause our reserved mapping 2390 // to be lost. That can cause confusion where different data 2391 // structures think they have the same memory mapped. The worst 2392 // scenario is if both the VM and a library think they have the 2393 // same memory mapped. 2394 return false; 2395 } 2396} 2397 2398static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec, 2399 int err) { 2400 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2401 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec, 2402 os::strerror(err), err); 2403} 2404 2405static void warn_fail_commit_memory(char* addr, size_t bytes, 2406 size_t alignment_hint, bool exec, 2407 int err) { 2408 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2409 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes, 2410 alignment_hint, exec, os::strerror(err), err); 2411} 2412 2413int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) { 2414 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2415 size_t size = bytes; 2416 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2417 if (res != NULL) { 2418 if (UseNUMAInterleaving) { 2419 numa_make_global(addr, bytes); 2420 } 2421 return 0; 2422 } 2423 2424 int err = errno; // save errno from mmap() call in mmap_chunk() 2425 2426 if (!recoverable_mmap_error(err)) { 2427 warn_fail_commit_memory(addr, bytes, exec, err); 2428 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory."); 2429 } 2430 2431 return err; 2432} 2433 2434bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 2435 return Solaris::commit_memory_impl(addr, bytes, exec) == 0; 2436} 2437 2438void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec, 2439 const char* mesg) { 2440 assert(mesg != NULL, "mesg must be specified"); 2441 int err = os::Solaris::commit_memory_impl(addr, bytes, exec); 2442 if (err != 0) { 2443 // the caller wants all commit errors to exit with the specified mesg: 2444 warn_fail_commit_memory(addr, bytes, exec, err); 2445 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2446 } 2447} 2448 2449size_t os::Solaris::page_size_for_alignment(size_t alignment) { 2450 assert(is_size_aligned(alignment, (size_t) vm_page_size()), 2451 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, 2452 alignment, (size_t) vm_page_size()); 2453 2454 for (int i = 0; _page_sizes[i] != 0; i++) { 2455 if (is_size_aligned(alignment, _page_sizes[i])) { 2456 return _page_sizes[i]; 2457 } 2458 } 2459 2460 return (size_t) vm_page_size(); 2461} 2462 2463int os::Solaris::commit_memory_impl(char* addr, size_t bytes, 2464 size_t alignment_hint, bool exec) { 2465 int err = Solaris::commit_memory_impl(addr, bytes, exec); 2466 if (err == 0 && UseLargePages && alignment_hint > 0) { 2467 assert(is_size_aligned(bytes, alignment_hint), 2468 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint); 2469 2470 // The syscall memcntl requires an exact page size (see man memcntl for details). 2471 size_t page_size = page_size_for_alignment(alignment_hint); 2472 if (page_size > (size_t) vm_page_size()) { 2473 (void)Solaris::setup_large_pages(addr, bytes, page_size); 2474 } 2475 } 2476 return err; 2477} 2478 2479bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2480 bool exec) { 2481 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0; 2482} 2483 2484void os::pd_commit_memory_or_exit(char* addr, size_t bytes, 2485 size_t alignment_hint, bool exec, 2486 const char* mesg) { 2487 assert(mesg != NULL, "mesg must be specified"); 2488 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec); 2489 if (err != 0) { 2490 // the caller wants all commit errors to exit with the specified mesg: 2491 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err); 2492 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2493 } 2494} 2495 2496// Uncommit the pages in a specified region. 2497void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { 2498 if (madvise(addr, bytes, MADV_FREE) < 0) { 2499 debug_only(warning("MADV_FREE failed.")); 2500 return; 2501 } 2502} 2503 2504bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2505 return os::commit_memory(addr, size, !ExecMem); 2506} 2507 2508bool os::remove_stack_guard_pages(char* addr, size_t size) { 2509 return os::uncommit_memory(addr, size); 2510} 2511 2512// Change the page size in a given range. 2513void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2514 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2515 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2516 if (UseLargePages) { 2517 size_t page_size = Solaris::page_size_for_alignment(alignment_hint); 2518 if (page_size > (size_t) vm_page_size()) { 2519 Solaris::setup_large_pages(addr, bytes, page_size); 2520 } 2521 } 2522} 2523 2524// Tell the OS to make the range local to the first-touching LWP 2525void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2526 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2527 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2528 debug_only(warning("MADV_ACCESS_LWP failed.")); 2529 } 2530} 2531 2532// Tell the OS that this range would be accessed from different LWPs. 2533void os::numa_make_global(char *addr, size_t bytes) { 2534 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2535 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2536 debug_only(warning("MADV_ACCESS_MANY failed.")); 2537 } 2538} 2539 2540// Get the number of the locality groups. 2541size_t os::numa_get_groups_num() { 2542 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2543 return n != -1 ? n : 1; 2544} 2545 2546// Get a list of leaf locality groups. A leaf lgroup is group that 2547// doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2548// board. An LWP is assigned to one of these groups upon creation. 2549size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2550 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2551 ids[0] = 0; 2552 return 1; 2553 } 2554 int result_size = 0, top = 1, bottom = 0, cur = 0; 2555 for (int k = 0; k < size; k++) { 2556 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2557 (Solaris::lgrp_id_t*)&ids[top], size - top); 2558 if (r == -1) { 2559 ids[0] = 0; 2560 return 1; 2561 } 2562 if (!r) { 2563 // That's a leaf node. 2564 assert(bottom <= cur, "Sanity check"); 2565 // Check if the node has memory 2566 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2567 NULL, 0, LGRP_RSRC_MEM) > 0) { 2568 ids[bottom++] = ids[cur]; 2569 } 2570 } 2571 top += r; 2572 cur++; 2573 } 2574 if (bottom == 0) { 2575 // Handle a situation, when the OS reports no memory available. 2576 // Assume UMA architecture. 2577 ids[0] = 0; 2578 return 1; 2579 } 2580 return bottom; 2581} 2582 2583// Detect the topology change. Typically happens during CPU plugging-unplugging. 2584bool os::numa_topology_changed() { 2585 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2586 if (is_stale != -1 && is_stale) { 2587 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2588 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2589 assert(c != 0, "Failure to initialize LGRP API"); 2590 Solaris::set_lgrp_cookie(c); 2591 return true; 2592 } 2593 return false; 2594} 2595 2596// Get the group id of the current LWP. 2597int os::numa_get_group_id() { 2598 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2599 if (lgrp_id == -1) { 2600 return 0; 2601 } 2602 const int size = os::numa_get_groups_num(); 2603 int *ids = (int*)alloca(size * sizeof(int)); 2604 2605 // Get the ids of all lgroups with memory; r is the count. 2606 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2607 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2608 if (r <= 0) { 2609 return 0; 2610 } 2611 return ids[os::random() % r]; 2612} 2613 2614// Request information about the page. 2615bool os::get_page_info(char *start, page_info* info) { 2616 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2617 uint64_t addr = (uintptr_t)start; 2618 uint64_t outdata[2]; 2619 uint_t validity = 0; 2620 2621 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2622 return false; 2623 } 2624 2625 info->size = 0; 2626 info->lgrp_id = -1; 2627 2628 if ((validity & 1) != 0) { 2629 if ((validity & 2) != 0) { 2630 info->lgrp_id = outdata[0]; 2631 } 2632 if ((validity & 4) != 0) { 2633 info->size = outdata[1]; 2634 } 2635 return true; 2636 } 2637 return false; 2638} 2639 2640// Scan the pages from start to end until a page different than 2641// the one described in the info parameter is encountered. 2642char *os::scan_pages(char *start, char* end, page_info* page_expected, 2643 page_info* page_found) { 2644 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2645 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2646 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1]; 2647 uint_t validity[MAX_MEMINFO_CNT]; 2648 2649 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2650 uint64_t p = (uint64_t)start; 2651 while (p < (uint64_t)end) { 2652 addrs[0] = p; 2653 size_t addrs_count = 1; 2654 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { 2655 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2656 addrs_count++; 2657 } 2658 2659 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2660 return NULL; 2661 } 2662 2663 size_t i = 0; 2664 for (; i < addrs_count; i++) { 2665 if ((validity[i] & 1) != 0) { 2666 if ((validity[i] & 4) != 0) { 2667 if (outdata[types * i + 1] != page_expected->size) { 2668 break; 2669 } 2670 } else if (page_expected->size != 0) { 2671 break; 2672 } 2673 2674 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2675 if (outdata[types * i] != page_expected->lgrp_id) { 2676 break; 2677 } 2678 } 2679 } else { 2680 return NULL; 2681 } 2682 } 2683 2684 if (i < addrs_count) { 2685 if ((validity[i] & 2) != 0) { 2686 page_found->lgrp_id = outdata[types * i]; 2687 } else { 2688 page_found->lgrp_id = -1; 2689 } 2690 if ((validity[i] & 4) != 0) { 2691 page_found->size = outdata[types * i + 1]; 2692 } else { 2693 page_found->size = 0; 2694 } 2695 return (char*)addrs[i]; 2696 } 2697 2698 p = addrs[addrs_count - 1] + page_size; 2699 } 2700 return end; 2701} 2702 2703bool os::pd_uncommit_memory(char* addr, size_t bytes) { 2704 size_t size = bytes; 2705 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2706 // uncommitted page. Otherwise, the read/write might succeed if we 2707 // have enough swap space to back the physical page. 2708 return 2709 NULL != Solaris::mmap_chunk(addr, size, 2710 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2711 PROT_NONE); 2712} 2713 2714char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2715 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2716 2717 if (b == MAP_FAILED) { 2718 return NULL; 2719 } 2720 return b; 2721} 2722 2723char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, 2724 size_t alignment_hint, bool fixed) { 2725 char* addr = requested_addr; 2726 int flags = MAP_PRIVATE | MAP_NORESERVE; 2727 2728 assert(!(fixed && (alignment_hint > 0)), 2729 "alignment hint meaningless with fixed mmap"); 2730 2731 if (fixed) { 2732 flags |= MAP_FIXED; 2733 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) { 2734 flags |= MAP_ALIGN; 2735 addr = (char*) alignment_hint; 2736 } 2737 2738 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2739 // uncommitted page. Otherwise, the read/write might succeed if we 2740 // have enough swap space to back the physical page. 2741 return mmap_chunk(addr, bytes, flags, PROT_NONE); 2742} 2743 2744char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2745 size_t alignment_hint) { 2746 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, 2747 (requested_addr != NULL)); 2748 2749 guarantee(requested_addr == NULL || requested_addr == addr, 2750 "OS failed to return requested mmap address."); 2751 return addr; 2752} 2753 2754// Reserve memory at an arbitrary address, only if that area is 2755// available (and not reserved for something else). 2756 2757char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2758 const int max_tries = 10; 2759 char* base[max_tries]; 2760 size_t size[max_tries]; 2761 2762 // Solaris adds a gap between mmap'ed regions. The size of the gap 2763 // is dependent on the requested size and the MMU. Our initial gap 2764 // value here is just a guess and will be corrected later. 2765 bool had_top_overlap = false; 2766 bool have_adjusted_gap = false; 2767 size_t gap = 0x400000; 2768 2769 // Assert only that the size is a multiple of the page size, since 2770 // that's all that mmap requires, and since that's all we really know 2771 // about at this low abstraction level. If we need higher alignment, 2772 // we can either pass an alignment to this method or verify alignment 2773 // in one of the methods further up the call chain. See bug 5044738. 2774 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2775 2776 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 2777 // Give it a try, if the kernel honors the hint we can return immediately. 2778 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 2779 2780 volatile int err = errno; 2781 if (addr == requested_addr) { 2782 return addr; 2783 } else if (addr != NULL) { 2784 pd_unmap_memory(addr, bytes); 2785 } 2786 2787 if (log_is_enabled(Warning, os)) { 2788 char buf[256]; 2789 buf[0] = '\0'; 2790 if (addr == NULL) { 2791 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err)); 2792 } 2793 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at " 2794 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT 2795 "%s", bytes, requested_addr, addr, buf); 2796 } 2797 2798 // Address hint method didn't work. Fall back to the old method. 2799 // In theory, once SNV becomes our oldest supported platform, this 2800 // code will no longer be needed. 2801 // 2802 // Repeatedly allocate blocks until the block is allocated at the 2803 // right spot. Give up after max_tries. 2804 int i; 2805 for (i = 0; i < max_tries; ++i) { 2806 base[i] = reserve_memory(bytes); 2807 2808 if (base[i] != NULL) { 2809 // Is this the block we wanted? 2810 if (base[i] == requested_addr) { 2811 size[i] = bytes; 2812 break; 2813 } 2814 2815 // check that the gap value is right 2816 if (had_top_overlap && !have_adjusted_gap) { 2817 size_t actual_gap = base[i-1] - base[i] - bytes; 2818 if (gap != actual_gap) { 2819 // adjust the gap value and retry the last 2 allocations 2820 assert(i > 0, "gap adjustment code problem"); 2821 have_adjusted_gap = true; // adjust the gap only once, just in case 2822 gap = actual_gap; 2823 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap); 2824 unmap_memory(base[i], bytes); 2825 unmap_memory(base[i-1], size[i-1]); 2826 i-=2; 2827 continue; 2828 } 2829 } 2830 2831 // Does this overlap the block we wanted? Give back the overlapped 2832 // parts and try again. 2833 // 2834 // There is still a bug in this code: if top_overlap == bytes, 2835 // the overlap is offset from requested region by the value of gap. 2836 // In this case giving back the overlapped part will not work, 2837 // because we'll give back the entire block at base[i] and 2838 // therefore the subsequent allocation will not generate a new gap. 2839 // This could be fixed with a new algorithm that used larger 2840 // or variable size chunks to find the requested region - 2841 // but such a change would introduce additional complications. 2842 // It's rare enough that the planets align for this bug, 2843 // so we'll just wait for a fix for 6204603/5003415 which 2844 // will provide a mmap flag to allow us to avoid this business. 2845 2846 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2847 if (top_overlap >= 0 && top_overlap < bytes) { 2848 had_top_overlap = true; 2849 unmap_memory(base[i], top_overlap); 2850 base[i] += top_overlap; 2851 size[i] = bytes - top_overlap; 2852 } else { 2853 size_t bottom_overlap = base[i] + bytes - requested_addr; 2854 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2855 if (bottom_overlap == 0) { 2856 log_info(os)("attempt_reserve_memory_at: possible alignment bug"); 2857 } 2858 unmap_memory(requested_addr, bottom_overlap); 2859 size[i] = bytes - bottom_overlap; 2860 } else { 2861 size[i] = bytes; 2862 } 2863 } 2864 } 2865 } 2866 2867 // Give back the unused reserved pieces. 2868 2869 for (int j = 0; j < i; ++j) { 2870 if (base[j] != NULL) { 2871 unmap_memory(base[j], size[j]); 2872 } 2873 } 2874 2875 return (i < max_tries) ? requested_addr : NULL; 2876} 2877 2878bool os::pd_release_memory(char* addr, size_t bytes) { 2879 size_t size = bytes; 2880 return munmap(addr, size) == 0; 2881} 2882 2883static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 2884 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()), 2885 "addr must be page aligned"); 2886 int retVal = mprotect(addr, bytes, prot); 2887 return retVal == 0; 2888} 2889 2890// Protect memory (Used to pass readonly pages through 2891// JNI GetArray<type>Elements with empty arrays.) 2892// Also, used for serialization page and for compressed oops null pointer 2893// checking. 2894bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2895 bool is_committed) { 2896 unsigned int p = 0; 2897 switch (prot) { 2898 case MEM_PROT_NONE: p = PROT_NONE; break; 2899 case MEM_PROT_READ: p = PROT_READ; break; 2900 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2901 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2902 default: 2903 ShouldNotReachHere(); 2904 } 2905 // is_committed is unused. 2906 return solaris_mprotect(addr, bytes, p); 2907} 2908 2909// guard_memory and unguard_memory only happens within stack guard pages. 2910// Since ISM pertains only to the heap, guard and unguard memory should not 2911/// happen with an ISM region. 2912bool os::guard_memory(char* addr, size_t bytes) { 2913 return solaris_mprotect(addr, bytes, PROT_NONE); 2914} 2915 2916bool os::unguard_memory(char* addr, size_t bytes) { 2917 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 2918} 2919 2920// Large page support 2921static size_t _large_page_size = 0; 2922 2923// Insertion sort for small arrays (descending order). 2924static void insertion_sort_descending(size_t* array, int len) { 2925 for (int i = 0; i < len; i++) { 2926 size_t val = array[i]; 2927 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 2928 size_t tmp = array[key]; 2929 array[key] = array[key - 1]; 2930 array[key - 1] = tmp; 2931 } 2932 } 2933} 2934 2935bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) { 2936 const unsigned int usable_count = VM_Version::page_size_count(); 2937 if (usable_count == 1) { 2938 return false; 2939 } 2940 2941 // Find the right getpagesizes interface. When solaris 11 is the minimum 2942 // build platform, getpagesizes() (without the '2') can be called directly. 2943 typedef int (*gps_t)(size_t[], int); 2944 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); 2945 if (gps_func == NULL) { 2946 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); 2947 if (gps_func == NULL) { 2948 if (warn) { 2949 warning("MPSS is not supported by the operating system."); 2950 } 2951 return false; 2952 } 2953 } 2954 2955 // Fill the array of page sizes. 2956 int n = (*gps_func)(_page_sizes, page_sizes_max); 2957 assert(n > 0, "Solaris bug?"); 2958 2959 if (n == page_sizes_max) { 2960 // Add a sentinel value (necessary only if the array was completely filled 2961 // since it is static (zeroed at initialization)). 2962 _page_sizes[--n] = 0; 2963 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 2964 } 2965 assert(_page_sizes[n] == 0, "missing sentinel"); 2966 trace_page_sizes("available page sizes", _page_sizes, n); 2967 2968 if (n == 1) return false; // Only one page size available. 2969 2970 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 2971 // select up to usable_count elements. First sort the array, find the first 2972 // acceptable value, then copy the usable sizes to the top of the array and 2973 // trim the rest. Make sure to include the default page size :-). 2974 // 2975 // A better policy could get rid of the 4M limit by taking the sizes of the 2976 // important VM memory regions (java heap and possibly the code cache) into 2977 // account. 2978 insertion_sort_descending(_page_sizes, n); 2979 const size_t size_limit = 2980 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 2981 int beg; 2982 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */; 2983 const int end = MIN2((int)usable_count, n) - 1; 2984 for (int cur = 0; cur < end; ++cur, ++beg) { 2985 _page_sizes[cur] = _page_sizes[beg]; 2986 } 2987 _page_sizes[end] = vm_page_size(); 2988 _page_sizes[end + 1] = 0; 2989 2990 if (_page_sizes[end] > _page_sizes[end - 1]) { 2991 // Default page size is not the smallest; sort again. 2992 insertion_sort_descending(_page_sizes, end + 1); 2993 } 2994 *page_size = _page_sizes[0]; 2995 2996 trace_page_sizes("usable page sizes", _page_sizes, end + 1); 2997 return true; 2998} 2999 3000void os::large_page_init() { 3001 if (UseLargePages) { 3002 // print a warning if any large page related flag is specified on command line 3003 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 3004 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 3005 3006 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 3007 } 3008} 3009 3010bool os::Solaris::is_valid_page_size(size_t bytes) { 3011 for (int i = 0; _page_sizes[i] != 0; i++) { 3012 if (_page_sizes[i] == bytes) { 3013 return true; 3014 } 3015 } 3016 return false; 3017} 3018 3019bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) { 3020 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align); 3021 assert(is_ptr_aligned((void*) start, align), 3022 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align); 3023 assert(is_size_aligned(bytes, align), 3024 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align); 3025 3026 // Signal to OS that we want large pages for addresses 3027 // from addr, addr + bytes 3028 struct memcntl_mha mpss_struct; 3029 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 3030 mpss_struct.mha_pagesize = align; 3031 mpss_struct.mha_flags = 0; 3032 // Upon successful completion, memcntl() returns 0 3033 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) { 3034 debug_only(warning("Attempt to use MPSS failed.")); 3035 return false; 3036 } 3037 return true; 3038} 3039 3040char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) { 3041 fatal("os::reserve_memory_special should not be called on Solaris."); 3042 return NULL; 3043} 3044 3045bool os::release_memory_special(char* base, size_t bytes) { 3046 fatal("os::release_memory_special should not be called on Solaris."); 3047 return false; 3048} 3049 3050size_t os::large_page_size() { 3051 return _large_page_size; 3052} 3053 3054// MPSS allows application to commit large page memory on demand; with ISM 3055// the entire memory region must be allocated as shared memory. 3056bool os::can_commit_large_page_memory() { 3057 return true; 3058} 3059 3060bool os::can_execute_large_page_memory() { 3061 return true; 3062} 3063 3064// Read calls from inside the vm need to perform state transitions 3065size_t os::read(int fd, void *buf, unsigned int nBytes) { 3066 size_t res; 3067 JavaThread* thread = (JavaThread*)Thread::current(); 3068 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 3069 ThreadBlockInVM tbiv(thread); 3070 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 3071 return res; 3072} 3073 3074size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 3075 size_t res; 3076 JavaThread* thread = (JavaThread*)Thread::current(); 3077 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 3078 ThreadBlockInVM tbiv(thread); 3079 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res); 3080 return res; 3081} 3082 3083size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) { 3084 size_t res; 3085 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 3086 "Assumed _thread_in_native"); 3087 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 3088 return res; 3089} 3090 3091void os::naked_short_sleep(jlong ms) { 3092 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3093 3094 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but 3095 // Solaris requires -lrt for this. 3096 usleep((ms * 1000)); 3097 3098 return; 3099} 3100 3101// Sleep forever; naked call to OS-specific sleep; use with CAUTION 3102void os::infinite_sleep() { 3103 while (true) { // sleep forever ... 3104 ::sleep(100); // ... 100 seconds at a time 3105 } 3106} 3107 3108// Used to convert frequent JVM_Yield() to nops 3109bool os::dont_yield() { 3110 if (DontYieldALot) { 3111 static hrtime_t last_time = 0; 3112 hrtime_t diff = getTimeNanos() - last_time; 3113 3114 if (diff < DontYieldALotInterval * 1000000) { 3115 return true; 3116 } 3117 3118 last_time += diff; 3119 3120 return false; 3121 } else { 3122 return false; 3123 } 3124} 3125 3126// Note that yield semantics are defined by the scheduling class to which 3127// the thread currently belongs. Typically, yield will _not yield to 3128// other equal or higher priority threads that reside on the dispatch queues 3129// of other CPUs. 3130 3131void os::naked_yield() { 3132 thr_yield(); 3133} 3134 3135// Interface for setting lwp priorities. If we are using T2 libthread, 3136// which forces the use of BoundThreads or we manually set UseBoundThreads, 3137// all of our threads will be assigned to real lwp's. Using the thr_setprio 3138// function is meaningless in this mode so we must adjust the real lwp's priority 3139// The routines below implement the getting and setting of lwp priorities. 3140// 3141// Note: T2 is now the only supported libthread. UseBoundThreads flag is 3142// being deprecated and all threads are now BoundThreads 3143// 3144// Note: There are three priority scales used on Solaris. Java priotities 3145// which range from 1 to 10, libthread "thr_setprio" scale which range 3146// from 0 to 127, and the current scheduling class of the process we 3147// are running in. This is typically from -60 to +60. 3148// The setting of the lwp priorities in done after a call to thr_setprio 3149// so Java priorities are mapped to libthread priorities and we map from 3150// the latter to lwp priorities. We don't keep priorities stored in 3151// Java priorities since some of our worker threads want to set priorities 3152// higher than all Java threads. 3153// 3154// For related information: 3155// (1) man -s 2 priocntl 3156// (2) man -s 4 priocntl 3157// (3) man dispadmin 3158// = librt.so 3159// = libthread/common/rtsched.c - thrp_setlwpprio(). 3160// = ps -cL <pid> ... to validate priority. 3161// = sched_get_priority_min and _max 3162// pthread_create 3163// sched_setparam 3164// pthread_setschedparam 3165// 3166// Assumptions: 3167// + We assume that all threads in the process belong to the same 3168// scheduling class. IE. an homogenous process. 3169// + Must be root or in IA group to change change "interactive" attribute. 3170// Priocntl() will fail silently. The only indication of failure is when 3171// we read-back the value and notice that it hasn't changed. 3172// + Interactive threads enter the runq at the head, non-interactive at the tail. 3173// + For RT, change timeslice as well. Invariant: 3174// constant "priority integral" 3175// Konst == TimeSlice * (60-Priority) 3176// Given a priority, compute appropriate timeslice. 3177// + Higher numerical values have higher priority. 3178 3179// sched class attributes 3180typedef struct { 3181 int schedPolicy; // classID 3182 int maxPrio; 3183 int minPrio; 3184} SchedInfo; 3185 3186 3187static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; 3188 3189#ifdef ASSERT 3190static int ReadBackValidate = 1; 3191#endif 3192static int myClass = 0; 3193static int myMin = 0; 3194static int myMax = 0; 3195static int myCur = 0; 3196static bool priocntl_enable = false; 3197 3198static const int criticalPrio = FXCriticalPriority; 3199static int java_MaxPriority_to_os_priority = 0; // Saved mapping 3200 3201 3202// lwp_priocntl_init 3203// 3204// Try to determine the priority scale for our process. 3205// 3206// Return errno or 0 if OK. 3207// 3208static int lwp_priocntl_init() { 3209 int rslt; 3210 pcinfo_t ClassInfo; 3211 pcparms_t ParmInfo; 3212 int i; 3213 3214 if (!UseThreadPriorities) return 0; 3215 3216 // If ThreadPriorityPolicy is 1, switch tables 3217 if (ThreadPriorityPolicy == 1) { 3218 for (i = 0; i < CriticalPriority+1; i++) 3219 os::java_to_os_priority[i] = prio_policy1[i]; 3220 } 3221 if (UseCriticalJavaThreadPriority) { 3222 // MaxPriority always maps to the FX scheduling class and criticalPrio. 3223 // See set_native_priority() and set_lwp_class_and_priority(). 3224 // Save original MaxPriority mapping in case attempt to 3225 // use critical priority fails. 3226 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; 3227 // Set negative to distinguish from other priorities 3228 os::java_to_os_priority[MaxPriority] = -criticalPrio; 3229 } 3230 3231 // Get IDs for a set of well-known scheduling classes. 3232 // TODO-FIXME: GETCLINFO returns the current # of classes in the 3233 // the system. We should have a loop that iterates over the 3234 // classID values, which are known to be "small" integers. 3235 3236 strcpy(ClassInfo.pc_clname, "TS"); 3237 ClassInfo.pc_cid = -1; 3238 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3239 if (rslt < 0) return errno; 3240 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 3241 tsLimits.schedPolicy = ClassInfo.pc_cid; 3242 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 3243 tsLimits.minPrio = -tsLimits.maxPrio; 3244 3245 strcpy(ClassInfo.pc_clname, "IA"); 3246 ClassInfo.pc_cid = -1; 3247 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3248 if (rslt < 0) return errno; 3249 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 3250 iaLimits.schedPolicy = ClassInfo.pc_cid; 3251 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 3252 iaLimits.minPrio = -iaLimits.maxPrio; 3253 3254 strcpy(ClassInfo.pc_clname, "RT"); 3255 ClassInfo.pc_cid = -1; 3256 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3257 if (rslt < 0) return errno; 3258 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 3259 rtLimits.schedPolicy = ClassInfo.pc_cid; 3260 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 3261 rtLimits.minPrio = 0; 3262 3263 strcpy(ClassInfo.pc_clname, "FX"); 3264 ClassInfo.pc_cid = -1; 3265 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3266 if (rslt < 0) return errno; 3267 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); 3268 fxLimits.schedPolicy = ClassInfo.pc_cid; 3269 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; 3270 fxLimits.minPrio = 0; 3271 3272 // Query our "current" scheduling class. 3273 // This will normally be IA, TS or, rarely, FX or RT. 3274 memset(&ParmInfo, 0, sizeof(ParmInfo)); 3275 ParmInfo.pc_cid = PC_CLNULL; 3276 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3277 if (rslt < 0) return errno; 3278 myClass = ParmInfo.pc_cid; 3279 3280 // We now know our scheduling classId, get specific information 3281 // about the class. 3282 ClassInfo.pc_cid = myClass; 3283 ClassInfo.pc_clname[0] = 0; 3284 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); 3285 if (rslt < 0) return errno; 3286 3287 if (ThreadPriorityVerbose) { 3288 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 3289 } 3290 3291 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3292 ParmInfo.pc_cid = PC_CLNULL; 3293 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3294 if (rslt < 0) return errno; 3295 3296 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3297 myMin = rtLimits.minPrio; 3298 myMax = rtLimits.maxPrio; 3299 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3300 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3301 myMin = iaLimits.minPrio; 3302 myMax = iaLimits.maxPrio; 3303 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 3304 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3305 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3306 myMin = tsLimits.minPrio; 3307 myMax = tsLimits.maxPrio; 3308 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 3309 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3310 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3311 myMin = fxLimits.minPrio; 3312 myMax = fxLimits.maxPrio; 3313 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict 3314 } else { 3315 // No clue - punt 3316 if (ThreadPriorityVerbose) { 3317 tty->print_cr("Unknown scheduling class: %s ... \n", 3318 ClassInfo.pc_clname); 3319 } 3320 return EINVAL; // no clue, punt 3321 } 3322 3323 if (ThreadPriorityVerbose) { 3324 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax); 3325 } 3326 3327 priocntl_enable = true; // Enable changing priorities 3328 return 0; 3329} 3330 3331#define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 3332#define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 3333#define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 3334#define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) 3335 3336 3337// scale_to_lwp_priority 3338// 3339// Convert from the libthread "thr_setprio" scale to our current 3340// lwp scheduling class scale. 3341// 3342static int scale_to_lwp_priority(int rMin, int rMax, int x) { 3343 int v; 3344 3345 if (x == 127) return rMax; // avoid round-down 3346 v = (((x*(rMax-rMin)))/128)+rMin; 3347 return v; 3348} 3349 3350 3351// set_lwp_class_and_priority 3352int set_lwp_class_and_priority(int ThreadID, int lwpid, 3353 int newPrio, int new_class, bool scale) { 3354 int rslt; 3355 int Actual, Expected, prv; 3356 pcparms_t ParmInfo; // for GET-SET 3357#ifdef ASSERT 3358 pcparms_t ReadBack; // for readback 3359#endif 3360 3361 // Set priority via PC_GETPARMS, update, PC_SETPARMS 3362 // Query current values. 3363 // TODO: accelerate this by eliminating the PC_GETPARMS call. 3364 // Cache "pcparms_t" in global ParmCache. 3365 // TODO: elide set-to-same-value 3366 3367 // If something went wrong on init, don't change priorities. 3368 if (!priocntl_enable) { 3369 if (ThreadPriorityVerbose) { 3370 tty->print_cr("Trying to set priority but init failed, ignoring"); 3371 } 3372 return EINVAL; 3373 } 3374 3375 // If lwp hasn't started yet, just return 3376 // the _start routine will call us again. 3377 if (lwpid <= 0) { 3378 if (ThreadPriorityVerbose) { 3379 tty->print_cr("deferring the set_lwp_class_and_priority of thread " 3380 INTPTR_FORMAT " to %d, lwpid not set", 3381 ThreadID, newPrio); 3382 } 3383 return 0; 3384 } 3385 3386 if (ThreadPriorityVerbose) { 3387 tty->print_cr ("set_lwp_class_and_priority(" 3388 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 3389 ThreadID, lwpid, newPrio); 3390 } 3391 3392 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3393 ParmInfo.pc_cid = PC_CLNULL; 3394 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 3395 if (rslt < 0) return errno; 3396 3397 int cur_class = ParmInfo.pc_cid; 3398 ParmInfo.pc_cid = (id_t)new_class; 3399 3400 if (new_class == rtLimits.schedPolicy) { 3401 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 3402 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, 3403 rtLimits.maxPrio, newPrio) 3404 : newPrio; 3405 rtInfo->rt_tqsecs = RT_NOCHANGE; 3406 rtInfo->rt_tqnsecs = RT_NOCHANGE; 3407 if (ThreadPriorityVerbose) { 3408 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 3409 } 3410 } else if (new_class == iaLimits.schedPolicy) { 3411 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3412 int maxClamped = MIN2(iaLimits.maxPrio, 3413 cur_class == new_class 3414 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); 3415 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, 3416 maxClamped, newPrio) 3417 : newPrio; 3418 iaInfo->ia_uprilim = cur_class == new_class 3419 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; 3420 iaInfo->ia_mode = IA_NOCHANGE; 3421 if (ThreadPriorityVerbose) { 3422 tty->print_cr("IA: [%d...%d] %d->%d\n", 3423 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 3424 } 3425 } else if (new_class == tsLimits.schedPolicy) { 3426 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3427 int maxClamped = MIN2(tsLimits.maxPrio, 3428 cur_class == new_class 3429 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); 3430 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, 3431 maxClamped, newPrio) 3432 : newPrio; 3433 tsInfo->ts_uprilim = cur_class == new_class 3434 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; 3435 if (ThreadPriorityVerbose) { 3436 tty->print_cr("TS: [%d...%d] %d->%d\n", 3437 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 3438 } 3439 } else if (new_class == fxLimits.schedPolicy) { 3440 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3441 int maxClamped = MIN2(fxLimits.maxPrio, 3442 cur_class == new_class 3443 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); 3444 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, 3445 maxClamped, newPrio) 3446 : newPrio; 3447 fxInfo->fx_uprilim = cur_class == new_class 3448 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; 3449 fxInfo->fx_tqsecs = FX_NOCHANGE; 3450 fxInfo->fx_tqnsecs = FX_NOCHANGE; 3451 if (ThreadPriorityVerbose) { 3452 tty->print_cr("FX: [%d...%d] %d->%d\n", 3453 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); 3454 } 3455 } else { 3456 if (ThreadPriorityVerbose) { 3457 tty->print_cr("Unknown new scheduling class %d\n", new_class); 3458 } 3459 return EINVAL; // no clue, punt 3460 } 3461 3462 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 3463 if (ThreadPriorityVerbose && rslt) { 3464 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 3465 } 3466 if (rslt < 0) return errno; 3467 3468#ifdef ASSERT 3469 // Sanity check: read back what we just attempted to set. 3470 // In theory it could have changed in the interim ... 3471 // 3472 // The priocntl system call is tricky. 3473 // Sometimes it'll validate the priority value argument and 3474 // return EINVAL if unhappy. At other times it fails silently. 3475 // Readbacks are prudent. 3476 3477 if (!ReadBackValidate) return 0; 3478 3479 memset(&ReadBack, 0, sizeof(pcparms_t)); 3480 ReadBack.pc_cid = PC_CLNULL; 3481 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 3482 assert(rslt >= 0, "priocntl failed"); 3483 Actual = Expected = 0xBAD; 3484 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3485 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3486 Actual = RTPRI(ReadBack)->rt_pri; 3487 Expected = RTPRI(ParmInfo)->rt_pri; 3488 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3489 Actual = IAPRI(ReadBack)->ia_upri; 3490 Expected = IAPRI(ParmInfo)->ia_upri; 3491 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3492 Actual = TSPRI(ReadBack)->ts_upri; 3493 Expected = TSPRI(ParmInfo)->ts_upri; 3494 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3495 Actual = FXPRI(ReadBack)->fx_upri; 3496 Expected = FXPRI(ParmInfo)->fx_upri; 3497 } else { 3498 if (ThreadPriorityVerbose) { 3499 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", 3500 ParmInfo.pc_cid); 3501 } 3502 } 3503 3504 if (Actual != Expected) { 3505 if (ThreadPriorityVerbose) { 3506 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 3507 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 3508 } 3509 } 3510#endif 3511 3512 return 0; 3513} 3514 3515// Solaris only gives access to 128 real priorities at a time, 3516// so we expand Java's ten to fill this range. This would be better 3517// if we dynamically adjusted relative priorities. 3518// 3519// The ThreadPriorityPolicy option allows us to select 2 different 3520// priority scales. 3521// 3522// ThreadPriorityPolicy=0 3523// Since the Solaris' default priority is MaximumPriority, we do not 3524// set a priority lower than Max unless a priority lower than 3525// NormPriority is requested. 3526// 3527// ThreadPriorityPolicy=1 3528// This mode causes the priority table to get filled with 3529// linear values. NormPriority get's mapped to 50% of the 3530// Maximum priority an so on. This will cause VM threads 3531// to get unfair treatment against other Solaris processes 3532// which do not explicitly alter their thread priorities. 3533 3534int os::java_to_os_priority[CriticalPriority + 1] = { 3535 -99999, // 0 Entry should never be used 3536 3537 0, // 1 MinPriority 3538 32, // 2 3539 64, // 3 3540 3541 96, // 4 3542 127, // 5 NormPriority 3543 127, // 6 3544 3545 127, // 7 3546 127, // 8 3547 127, // 9 NearMaxPriority 3548 3549 127, // 10 MaxPriority 3550 3551 -criticalPrio // 11 CriticalPriority 3552}; 3553 3554OSReturn os::set_native_priority(Thread* thread, int newpri) { 3555 OSThread* osthread = thread->osthread(); 3556 3557 // Save requested priority in case the thread hasn't been started 3558 osthread->set_native_priority(newpri); 3559 3560 // Check for critical priority request 3561 bool fxcritical = false; 3562 if (newpri == -criticalPrio) { 3563 fxcritical = true; 3564 newpri = criticalPrio; 3565 } 3566 3567 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 3568 if (!UseThreadPriorities) return OS_OK; 3569 3570 int status = 0; 3571 3572 if (!fxcritical) { 3573 // Use thr_setprio only if we have a priority that thr_setprio understands 3574 status = thr_setprio(thread->osthread()->thread_id(), newpri); 3575 } 3576 3577 int lwp_status = 3578 set_lwp_class_and_priority(osthread->thread_id(), 3579 osthread->lwp_id(), 3580 newpri, 3581 fxcritical ? fxLimits.schedPolicy : myClass, 3582 !fxcritical); 3583 if (lwp_status != 0 && fxcritical) { 3584 // Try again, this time without changing the scheduling class 3585 newpri = java_MaxPriority_to_os_priority; 3586 lwp_status = set_lwp_class_and_priority(osthread->thread_id(), 3587 osthread->lwp_id(), 3588 newpri, myClass, false); 3589 } 3590 status |= lwp_status; 3591 return (status == 0) ? OS_OK : OS_ERR; 3592} 3593 3594 3595OSReturn os::get_native_priority(const Thread* const thread, 3596 int *priority_ptr) { 3597 int p; 3598 if (!UseThreadPriorities) { 3599 *priority_ptr = NormalPriority; 3600 return OS_OK; 3601 } 3602 int status = thr_getprio(thread->osthread()->thread_id(), &p); 3603 if (status != 0) { 3604 return OS_ERR; 3605 } 3606 *priority_ptr = p; 3607 return OS_OK; 3608} 3609 3610 3611// Hint to the underlying OS that a task switch would not be good. 3612// Void return because it's a hint and can fail. 3613void os::hint_no_preempt() { 3614 schedctl_start(schedctl_init()); 3615} 3616 3617static void resume_clear_context(OSThread *osthread) { 3618 osthread->set_ucontext(NULL); 3619} 3620 3621static void suspend_save_context(OSThread *osthread, ucontext_t* context) { 3622 osthread->set_ucontext(context); 3623} 3624 3625static PosixSemaphore sr_semaphore; 3626 3627void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) { 3628 // Save and restore errno to avoid confusing native code with EINTR 3629 // after sigsuspend. 3630 int old_errno = errno; 3631 3632 OSThread* osthread = thread->osthread(); 3633 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 3634 3635 os::SuspendResume::State current = osthread->sr.state(); 3636 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 3637 suspend_save_context(osthread, uc); 3638 3639 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 3640 os::SuspendResume::State state = osthread->sr.suspended(); 3641 if (state == os::SuspendResume::SR_SUSPENDED) { 3642 sigset_t suspend_set; // signals for sigsuspend() 3643 3644 // get current set of blocked signals and unblock resume signal 3645 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 3646 sigdelset(&suspend_set, os::Solaris::SIGasync()); 3647 3648 sr_semaphore.signal(); 3649 // wait here until we are resumed 3650 while (1) { 3651 sigsuspend(&suspend_set); 3652 3653 os::SuspendResume::State result = osthread->sr.running(); 3654 if (result == os::SuspendResume::SR_RUNNING) { 3655 sr_semaphore.signal(); 3656 break; 3657 } 3658 } 3659 3660 } else if (state == os::SuspendResume::SR_RUNNING) { 3661 // request was cancelled, continue 3662 } else { 3663 ShouldNotReachHere(); 3664 } 3665 3666 resume_clear_context(osthread); 3667 } else if (current == os::SuspendResume::SR_RUNNING) { 3668 // request was cancelled, continue 3669 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 3670 // ignore 3671 } else { 3672 // ignore 3673 } 3674 3675 errno = old_errno; 3676} 3677 3678void os::print_statistics() { 3679} 3680 3681bool os::message_box(const char* title, const char* message) { 3682 int i; 3683 fdStream err(defaultStream::error_fd()); 3684 for (i = 0; i < 78; i++) err.print_raw("="); 3685 err.cr(); 3686 err.print_raw_cr(title); 3687 for (i = 0; i < 78; i++) err.print_raw("-"); 3688 err.cr(); 3689 err.print_raw_cr(message); 3690 for (i = 0; i < 78; i++) err.print_raw("="); 3691 err.cr(); 3692 3693 char buf[16]; 3694 // Prevent process from exiting upon "read error" without consuming all CPU 3695 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3696 3697 return buf[0] == 'y' || buf[0] == 'Y'; 3698} 3699 3700static int sr_notify(OSThread* osthread) { 3701 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync()); 3702 assert_status(status == 0, status, "thr_kill"); 3703 return status; 3704} 3705 3706// "Randomly" selected value for how long we want to spin 3707// before bailing out on suspending a thread, also how often 3708// we send a signal to a thread we want to resume 3709static const int RANDOMLY_LARGE_INTEGER = 1000000; 3710static const int RANDOMLY_LARGE_INTEGER2 = 100; 3711 3712static bool do_suspend(OSThread* osthread) { 3713 assert(osthread->sr.is_running(), "thread should be running"); 3714 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 3715 3716 // mark as suspended and send signal 3717 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 3718 // failed to switch, state wasn't running? 3719 ShouldNotReachHere(); 3720 return false; 3721 } 3722 3723 if (sr_notify(osthread) != 0) { 3724 ShouldNotReachHere(); 3725 } 3726 3727 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 3728 while (true) { 3729 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) { 3730 break; 3731 } else { 3732 // timeout 3733 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 3734 if (cancelled == os::SuspendResume::SR_RUNNING) { 3735 return false; 3736 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 3737 // make sure that we consume the signal on the semaphore as well 3738 sr_semaphore.wait(); 3739 break; 3740 } else { 3741 ShouldNotReachHere(); 3742 return false; 3743 } 3744 } 3745 } 3746 3747 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 3748 return true; 3749} 3750 3751static void do_resume(OSThread* osthread) { 3752 assert(osthread->sr.is_suspended(), "thread should be suspended"); 3753 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 3754 3755 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 3756 // failed to switch to WAKEUP_REQUEST 3757 ShouldNotReachHere(); 3758 return; 3759 } 3760 3761 while (true) { 3762 if (sr_notify(osthread) == 0) { 3763 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 3764 if (osthread->sr.is_running()) { 3765 return; 3766 } 3767 } 3768 } else { 3769 ShouldNotReachHere(); 3770 } 3771 } 3772 3773 guarantee(osthread->sr.is_running(), "Must be running!"); 3774} 3775 3776void os::SuspendedThreadTask::internal_do_task() { 3777 if (do_suspend(_thread->osthread())) { 3778 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3779 do_task(context); 3780 do_resume(_thread->osthread()); 3781 } 3782} 3783 3784class PcFetcher : public os::SuspendedThreadTask { 3785 public: 3786 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} 3787 ExtendedPC result(); 3788 protected: 3789 void do_task(const os::SuspendedThreadTaskContext& context); 3790 private: 3791 ExtendedPC _epc; 3792}; 3793 3794ExtendedPC PcFetcher::result() { 3795 guarantee(is_done(), "task is not done yet."); 3796 return _epc; 3797} 3798 3799void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { 3800 Thread* thread = context.thread(); 3801 OSThread* osthread = thread->osthread(); 3802 if (osthread->ucontext() != NULL) { 3803 _epc = os::Solaris::ucontext_get_pc((const ucontext_t *) context.ucontext()); 3804 } else { 3805 // NULL context is unexpected, double-check this is the VMThread 3806 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 3807 } 3808} 3809 3810// A lightweight implementation that does not suspend the target thread and 3811// thus returns only a hint. Used for profiling only! 3812ExtendedPC os::get_thread_pc(Thread* thread) { 3813 // Make sure that it is called by the watcher and the Threads lock is owned. 3814 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock"); 3815 // For now, is only used to profile the VM Thread 3816 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3817 PcFetcher fetcher(thread); 3818 fetcher.run(); 3819 return fetcher.result(); 3820} 3821 3822 3823// This does not do anything on Solaris. This is basically a hook for being 3824// able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 3825void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3826 const methodHandle& method, JavaCallArguments* args, 3827 Thread* thread) { 3828 f(value, method, args, thread); 3829} 3830 3831// This routine may be used by user applications as a "hook" to catch signals. 3832// The user-defined signal handler must pass unrecognized signals to this 3833// routine, and if it returns true (non-zero), then the signal handler must 3834// return immediately. If the flag "abort_if_unrecognized" is true, then this 3835// routine will never retun false (zero), but instead will execute a VM panic 3836// routine kill the process. 3837// 3838// If this routine returns false, it is OK to call it again. This allows 3839// the user-defined signal handler to perform checks either before or after 3840// the VM performs its own checks. Naturally, the user code would be making 3841// a serious error if it tried to handle an exception (such as a null check 3842// or breakpoint) that the VM was generating for its own correct operation. 3843// 3844// This routine may recognize any of the following kinds of signals: 3845// SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 3846// os::Solaris::SIGasync 3847// It should be consulted by handlers for any of those signals. 3848// 3849// The caller of this routine must pass in the three arguments supplied 3850// to the function referred to in the "sa_sigaction" (not the "sa_handler") 3851// field of the structure passed to sigaction(). This routine assumes that 3852// the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3853// 3854// Note that the VM will print warnings if it detects conflicting signal 3855// handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3856// 3857extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo, 3858 siginfo_t* siginfo, 3859 void* ucontext, 3860 int abort_if_unrecognized); 3861 3862 3863void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 3864 int orig_errno = errno; // Preserve errno value over signal handler. 3865 JVM_handle_solaris_signal(sig, info, ucVoid, true); 3866 errno = orig_errno; 3867} 3868 3869// This boolean allows users to forward their own non-matching signals 3870// to JVM_handle_solaris_signal, harmlessly. 3871bool os::Solaris::signal_handlers_are_installed = false; 3872 3873// For signal-chaining 3874bool os::Solaris::libjsig_is_loaded = false; 3875typedef struct sigaction *(*get_signal_t)(int); 3876get_signal_t os::Solaris::get_signal_action = NULL; 3877 3878struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 3879 struct sigaction *actp = NULL; 3880 3881 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) { 3882 // Retrieve the old signal handler from libjsig 3883 actp = (*get_signal_action)(sig); 3884 } 3885 if (actp == NULL) { 3886 // Retrieve the preinstalled signal handler from jvm 3887 actp = get_preinstalled_handler(sig); 3888 } 3889 3890 return actp; 3891} 3892 3893static bool call_chained_handler(struct sigaction *actp, int sig, 3894 siginfo_t *siginfo, void *context) { 3895 // Call the old signal handler 3896 if (actp->sa_handler == SIG_DFL) { 3897 // It's more reasonable to let jvm treat it as an unexpected exception 3898 // instead of taking the default action. 3899 return false; 3900 } else if (actp->sa_handler != SIG_IGN) { 3901 if ((actp->sa_flags & SA_NODEFER) == 0) { 3902 // automaticlly block the signal 3903 sigaddset(&(actp->sa_mask), sig); 3904 } 3905 3906 sa_handler_t hand; 3907 sa_sigaction_t sa; 3908 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3909 // retrieve the chained handler 3910 if (siginfo_flag_set) { 3911 sa = actp->sa_sigaction; 3912 } else { 3913 hand = actp->sa_handler; 3914 } 3915 3916 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3917 actp->sa_handler = SIG_DFL; 3918 } 3919 3920 // try to honor the signal mask 3921 sigset_t oset; 3922 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3923 3924 // call into the chained handler 3925 if (siginfo_flag_set) { 3926 (*sa)(sig, siginfo, context); 3927 } else { 3928 (*hand)(sig); 3929 } 3930 3931 // restore the signal mask 3932 pthread_sigmask(SIG_SETMASK, &oset, 0); 3933 } 3934 // Tell jvm's signal handler the signal is taken care of. 3935 return true; 3936} 3937 3938bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3939 bool chained = false; 3940 // signal-chaining 3941 if (UseSignalChaining) { 3942 struct sigaction *actp = get_chained_signal_action(sig); 3943 if (actp != NULL) { 3944 chained = call_chained_handler(actp, sig, siginfo, context); 3945 } 3946 } 3947 return chained; 3948} 3949 3950struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 3951 assert((chainedsigactions != (struct sigaction *)NULL) && 3952 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3953 if (preinstalled_sigs[sig] != 0) { 3954 return &chainedsigactions[sig]; 3955 } 3956 return NULL; 3957} 3958 3959void os::Solaris::save_preinstalled_handler(int sig, 3960 struct sigaction& oldAct) { 3961 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 3962 assert((chainedsigactions != (struct sigaction *)NULL) && 3963 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3964 chainedsigactions[sig] = oldAct; 3965 preinstalled_sigs[sig] = 1; 3966} 3967 3968void os::Solaris::set_signal_handler(int sig, bool set_installed, 3969 bool oktochain) { 3970 // Check for overwrite. 3971 struct sigaction oldAct; 3972 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3973 void* oldhand = 3974 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3975 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3976 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3977 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3978 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 3979 if (AllowUserSignalHandlers || !set_installed) { 3980 // Do not overwrite; user takes responsibility to forward to us. 3981 return; 3982 } else if (UseSignalChaining) { 3983 if (oktochain) { 3984 // save the old handler in jvm 3985 save_preinstalled_handler(sig, oldAct); 3986 } else { 3987 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal."); 3988 } 3989 // libjsig also interposes the sigaction() call below and saves the 3990 // old sigaction on it own. 3991 } else { 3992 fatal("Encountered unexpected pre-existing sigaction handler " 3993 "%#lx for signal %d.", (long)oldhand, sig); 3994 } 3995 } 3996 3997 struct sigaction sigAct; 3998 sigfillset(&(sigAct.sa_mask)); 3999 sigAct.sa_handler = SIG_DFL; 4000 4001 sigAct.sa_sigaction = signalHandler; 4002 // Handle SIGSEGV on alternate signal stack if 4003 // not using stack banging 4004 if (!UseStackBanging && sig == SIGSEGV) { 4005 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 4006 } else { 4007 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 4008 } 4009 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 4010 4011 sigaction(sig, &sigAct, &oldAct); 4012 4013 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4014 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4015 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 4016} 4017 4018 4019#define DO_SIGNAL_CHECK(sig) \ 4020 do { \ 4021 if (!sigismember(&check_signal_done, sig)) { \ 4022 os::Solaris::check_signal_handler(sig); \ 4023 } \ 4024 } while (0) 4025 4026// This method is a periodic task to check for misbehaving JNI applications 4027// under CheckJNI, we can add any periodic checks here 4028 4029void os::run_periodic_checks() { 4030 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 4031 // thereby preventing a NULL checks. 4032 if (!check_addr0_done) check_addr0_done = check_addr0(tty); 4033 4034 if (check_signals == false) return; 4035 4036 // SEGV and BUS if overridden could potentially prevent 4037 // generation of hs*.log in the event of a crash, debugging 4038 // such a case can be very challenging, so we absolutely 4039 // check for the following for a good measure: 4040 DO_SIGNAL_CHECK(SIGSEGV); 4041 DO_SIGNAL_CHECK(SIGILL); 4042 DO_SIGNAL_CHECK(SIGFPE); 4043 DO_SIGNAL_CHECK(SIGBUS); 4044 DO_SIGNAL_CHECK(SIGPIPE); 4045 DO_SIGNAL_CHECK(SIGXFSZ); 4046 4047 // ReduceSignalUsage allows the user to override these handlers 4048 // see comments at the very top and jvm_solaris.h 4049 if (!ReduceSignalUsage) { 4050 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 4051 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 4052 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 4053 DO_SIGNAL_CHECK(BREAK_SIGNAL); 4054 } 4055 4056 // See comments above for using JVM1/JVM2 4057 DO_SIGNAL_CHECK(os::Solaris::SIGasync()); 4058 4059} 4060 4061typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 4062 4063static os_sigaction_t os_sigaction = NULL; 4064 4065void os::Solaris::check_signal_handler(int sig) { 4066 char buf[O_BUFLEN]; 4067 address jvmHandler = NULL; 4068 4069 struct sigaction act; 4070 if (os_sigaction == NULL) { 4071 // only trust the default sigaction, in case it has been interposed 4072 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 4073 if (os_sigaction == NULL) return; 4074 } 4075 4076 os_sigaction(sig, (struct sigaction*)NULL, &act); 4077 4078 address thisHandler = (act.sa_flags & SA_SIGINFO) 4079 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 4080 : CAST_FROM_FN_PTR(address, act.sa_handler); 4081 4082 4083 switch (sig) { 4084 case SIGSEGV: 4085 case SIGBUS: 4086 case SIGFPE: 4087 case SIGPIPE: 4088 case SIGXFSZ: 4089 case SIGILL: 4090 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4091 break; 4092 4093 case SHUTDOWN1_SIGNAL: 4094 case SHUTDOWN2_SIGNAL: 4095 case SHUTDOWN3_SIGNAL: 4096 case BREAK_SIGNAL: 4097 jvmHandler = (address)user_handler(); 4098 break; 4099 4100 default: 4101 int asynsig = os::Solaris::SIGasync(); 4102 4103 if (sig == asynsig) { 4104 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4105 } else { 4106 return; 4107 } 4108 break; 4109 } 4110 4111 4112 if (thisHandler != jvmHandler) { 4113 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 4114 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 4115 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 4116 // No need to check this sig any longer 4117 sigaddset(&check_signal_done, sig); 4118 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 4119 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 4120 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 4121 exception_name(sig, buf, O_BUFLEN)); 4122 } 4123 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 4124 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 4125 tty->print("expected:"); 4126 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig)); 4127 tty->cr(); 4128 tty->print(" found:"); 4129 os::Posix::print_sa_flags(tty, act.sa_flags); 4130 tty->cr(); 4131 // No need to check this sig any longer 4132 sigaddset(&check_signal_done, sig); 4133 } 4134 4135 // Print all the signal handler state 4136 if (sigismember(&check_signal_done, sig)) { 4137 print_signal_handlers(tty, buf, O_BUFLEN); 4138 } 4139 4140} 4141 4142void os::Solaris::install_signal_handlers() { 4143 bool libjsigdone = false; 4144 signal_handlers_are_installed = true; 4145 4146 // signal-chaining 4147 typedef void (*signal_setting_t)(); 4148 signal_setting_t begin_signal_setting = NULL; 4149 signal_setting_t end_signal_setting = NULL; 4150 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4151 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 4152 if (begin_signal_setting != NULL) { 4153 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4154 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 4155 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 4156 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 4157 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t, 4158 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version")); 4159 libjsig_is_loaded = true; 4160 if (os::Solaris::get_libjsig_version != NULL) { 4161 libjsigversion = (*os::Solaris::get_libjsig_version)(); 4162 } 4163 assert(UseSignalChaining, "should enable signal-chaining"); 4164 } 4165 if (libjsig_is_loaded) { 4166 // Tell libjsig jvm is setting signal handlers 4167 (*begin_signal_setting)(); 4168 } 4169 4170 set_signal_handler(SIGSEGV, true, true); 4171 set_signal_handler(SIGPIPE, true, true); 4172 set_signal_handler(SIGXFSZ, true, true); 4173 set_signal_handler(SIGBUS, true, true); 4174 set_signal_handler(SIGILL, true, true); 4175 set_signal_handler(SIGFPE, true, true); 4176 4177 4178 if (os::Solaris::SIGasync() > OLDMAXSIGNUM) { 4179 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so 4180 // can not register overridable signals which might be > 32 4181 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) { 4182 // Tell libjsig jvm has finished setting signal handlers 4183 (*end_signal_setting)(); 4184 libjsigdone = true; 4185 } 4186 } 4187 4188 set_signal_handler(os::Solaris::SIGasync(), true, true); 4189 4190 if (libjsig_is_loaded && !libjsigdone) { 4191 // Tell libjsig jvm finishes setting signal handlers 4192 (*end_signal_setting)(); 4193 } 4194 4195 // We don't activate signal checker if libjsig is in place, we trust ourselves 4196 // and if UserSignalHandler is installed all bets are off. 4197 // Log that signal checking is off only if -verbose:jni is specified. 4198 if (CheckJNICalls) { 4199 if (libjsig_is_loaded) { 4200 if (PrintJNIResolving) { 4201 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 4202 } 4203 check_signals = false; 4204 } 4205 if (AllowUserSignalHandlers) { 4206 if (PrintJNIResolving) { 4207 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4208 } 4209 check_signals = false; 4210 } 4211 } 4212} 4213 4214 4215void report_error(const char* file_name, int line_no, const char* title, 4216 const char* format, ...); 4217 4218// (Static) wrapper for getisax(2) call. 4219os::Solaris::getisax_func_t os::Solaris::_getisax = 0; 4220 4221// (Static) wrappers for the liblgrp API 4222os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 4223os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 4224os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 4225os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 4226os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 4227os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 4228os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 4229os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 4230os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 4231 4232// (Static) wrapper for meminfo() call. 4233os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0; 4234 4235static address resolve_symbol_lazy(const char* name) { 4236 address addr = (address) dlsym(RTLD_DEFAULT, name); 4237 if (addr == NULL) { 4238 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 4239 addr = (address) dlsym(RTLD_NEXT, name); 4240 } 4241 return addr; 4242} 4243 4244static address resolve_symbol(const char* name) { 4245 address addr = resolve_symbol_lazy(name); 4246 if (addr == NULL) { 4247 fatal(dlerror()); 4248 } 4249 return addr; 4250} 4251 4252void os::Solaris::libthread_init() { 4253 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 4254 4255 lwp_priocntl_init(); 4256 4257 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 4258 if (func == NULL) { 4259 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 4260 // Guarantee that this VM is running on an new enough OS (5.6 or 4261 // later) that it will have a new enough libthread.so. 4262 guarantee(func != NULL, "libthread.so is too old."); 4263 } 4264 4265 int size; 4266 void (*handler_info_func)(address *, int *); 4267 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 4268 handler_info_func(&handler_start, &size); 4269 handler_end = handler_start + size; 4270} 4271 4272 4273int_fnP_mutex_tP os::Solaris::_mutex_lock; 4274int_fnP_mutex_tP os::Solaris::_mutex_trylock; 4275int_fnP_mutex_tP os::Solaris::_mutex_unlock; 4276int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 4277int_fnP_mutex_tP os::Solaris::_mutex_destroy; 4278int os::Solaris::_mutex_scope = USYNC_THREAD; 4279 4280int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 4281int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 4282int_fnP_cond_tP os::Solaris::_cond_signal; 4283int_fnP_cond_tP os::Solaris::_cond_broadcast; 4284int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 4285int_fnP_cond_tP os::Solaris::_cond_destroy; 4286int os::Solaris::_cond_scope = USYNC_THREAD; 4287 4288void os::Solaris::synchronization_init() { 4289 if (UseLWPSynchronization) { 4290 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 4291 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 4292 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 4293 os::Solaris::set_mutex_init(lwp_mutex_init); 4294 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 4295 os::Solaris::set_mutex_scope(USYNC_THREAD); 4296 4297 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 4298 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 4299 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 4300 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 4301 os::Solaris::set_cond_init(lwp_cond_init); 4302 os::Solaris::set_cond_destroy(lwp_cond_destroy); 4303 os::Solaris::set_cond_scope(USYNC_THREAD); 4304 } else { 4305 os::Solaris::set_mutex_scope(USYNC_THREAD); 4306 os::Solaris::set_cond_scope(USYNC_THREAD); 4307 4308 if (UsePthreads) { 4309 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 4310 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 4311 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 4312 os::Solaris::set_mutex_init(pthread_mutex_default_init); 4313 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 4314 4315 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 4316 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 4317 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 4318 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 4319 os::Solaris::set_cond_init(pthread_cond_default_init); 4320 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 4321 } else { 4322 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 4323 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 4324 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 4325 os::Solaris::set_mutex_init(::mutex_init); 4326 os::Solaris::set_mutex_destroy(::mutex_destroy); 4327 4328 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 4329 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 4330 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 4331 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 4332 os::Solaris::set_cond_init(::cond_init); 4333 os::Solaris::set_cond_destroy(::cond_destroy); 4334 } 4335 } 4336} 4337 4338bool os::Solaris::liblgrp_init() { 4339 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 4340 if (handle != NULL) { 4341 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 4342 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 4343 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 4344 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 4345 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 4346 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 4347 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 4348 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 4349 dlsym(handle, "lgrp_cookie_stale"))); 4350 4351 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 4352 set_lgrp_cookie(c); 4353 return true; 4354 } 4355 return false; 4356} 4357 4358void os::Solaris::misc_sym_init() { 4359 address func; 4360 4361 // getisax 4362 func = resolve_symbol_lazy("getisax"); 4363 if (func != NULL) { 4364 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func); 4365 } 4366 4367 // meminfo 4368 func = resolve_symbol_lazy("meminfo"); 4369 if (func != NULL) { 4370 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func)); 4371 } 4372} 4373 4374uint_t os::Solaris::getisax(uint32_t* array, uint_t n) { 4375 assert(_getisax != NULL, "_getisax not set"); 4376 return _getisax(array, n); 4377} 4378 4379// int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 4380typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 4381static pset_getloadavg_type pset_getloadavg_ptr = NULL; 4382 4383void init_pset_getloadavg_ptr(void) { 4384 pset_getloadavg_ptr = 4385 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 4386 if (pset_getloadavg_ptr == NULL) { 4387 log_warning(os)("pset_getloadavg function not found"); 4388 } 4389} 4390 4391int os::Solaris::_dev_zero_fd = -1; 4392 4393// this is called _before_ the global arguments have been parsed 4394void os::init(void) { 4395 _initial_pid = getpid(); 4396 4397 max_hrtime = first_hrtime = gethrtime(); 4398 4399 init_random(1234567); 4400 4401 page_size = sysconf(_SC_PAGESIZE); 4402 if (page_size == -1) { 4403 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 4404 } 4405 init_page_sizes((size_t) page_size); 4406 4407 Solaris::initialize_system_info(); 4408 4409 // Initialize misc. symbols as soon as possible, so we can use them 4410 // if we need them. 4411 Solaris::misc_sym_init(); 4412 4413 int fd = ::open("/dev/zero", O_RDWR); 4414 if (fd < 0) { 4415 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno)); 4416 } else { 4417 Solaris::set_dev_zero_fd(fd); 4418 4419 // Close on exec, child won't inherit. 4420 fcntl(fd, F_SETFD, FD_CLOEXEC); 4421 } 4422 4423 clock_tics_per_sec = CLK_TCK; 4424 4425 // check if dladdr1() exists; dladdr1 can provide more information than 4426 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 4427 // and is available on linker patches for 5.7 and 5.8. 4428 // libdl.so must have been loaded, this call is just an entry lookup 4429 void * hdl = dlopen("libdl.so", RTLD_NOW); 4430 if (hdl) { 4431 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 4432 } 4433 4434 // (Solaris only) this switches to calls that actually do locking. 4435 ThreadCritical::initialize(); 4436 4437 main_thread = thr_self(); 4438 4439 // Constant minimum stack size allowed. It must be at least 4440 // the minimum of what the OS supports (thr_min_stack()), and 4441 // enough to allow the thread to get to user bytecode execution. 4442 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed); 4443 4444 // dynamic lookup of functions that may not be available in our lowest 4445 // supported Solaris release 4446 void * handle = dlopen("libc.so.1", RTLD_LAZY); 4447 if (handle != NULL) { 4448 Solaris::_pthread_setname_np = // from 11.3 4449 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np"); 4450 4451 _get_nsec_fromepoch = // from 11.3.6 4452 (_get_nsec_fromepoch_func_t) dlsym(handle, "get_nsec_fromepoch"); 4453 } 4454} 4455 4456// To install functions for atexit system call 4457extern "C" { 4458 static void perfMemory_exit_helper() { 4459 perfMemory_exit(); 4460 } 4461} 4462 4463// this is called _after_ the global arguments have been parsed 4464jint os::init_2(void) { 4465 // try to enable extended file IO ASAP, see 6431278 4466 os::Solaris::try_enable_extended_io(); 4467 4468 // Allocate a single page and mark it as readable for safepoint polling. Also 4469 // use this first mmap call to check support for MAP_ALIGN. 4470 address polling_page = (address)Solaris::mmap_chunk((char*)page_size, 4471 page_size, 4472 MAP_PRIVATE | MAP_ALIGN, 4473 PROT_READ); 4474 if (polling_page == NULL) { 4475 has_map_align = false; 4476 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, 4477 PROT_READ); 4478 } 4479 4480 os::set_polling_page(polling_page); 4481 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page)); 4482 4483 if (!UseMembar) { 4484 address mem_serialize_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE); 4485 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 4486 os::set_memory_serialize_page(mem_serialize_page); 4487 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page)); 4488 } 4489 4490 // Check minimum allowable stack size for thread creation and to initialize 4491 // the java system classes, including StackOverflowError - depends on page 4492 // size. Add a page for compiler2 recursion in main thread. 4493 // Add in 2*BytesPerWord times page size to account for VM stack during 4494 // class initialization depending on 32 or 64 bit VM. 4495 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed, 4496 JavaThread::stack_guard_zone_size() + 4497 JavaThread::stack_shadow_zone_size() + 4498 (2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size); 4499 4500 size_t threadStackSizeInBytes = ThreadStackSize * K; 4501 if (threadStackSizeInBytes != 0 && 4502 threadStackSizeInBytes < os::Solaris::min_stack_allowed) { 4503 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk", 4504 os::Solaris::min_stack_allowed/K); 4505 return JNI_ERR; 4506 } 4507 4508 // For 64kbps there will be a 64kb page size, which makes 4509 // the usable default stack size quite a bit less. Increase the 4510 // stack for 64kb (or any > than 8kb) pages, this increases 4511 // virtual memory fragmentation (since we're not creating the 4512 // stack on a power of 2 boundary. The real fix for this 4513 // should be to fix the guard page mechanism. 4514 4515 if (vm_page_size() > 8*K) { 4516 threadStackSizeInBytes = (threadStackSizeInBytes != 0) 4517 ? threadStackSizeInBytes + 4518 JavaThread::stack_red_zone_size() + 4519 JavaThread::stack_yellow_zone_size() 4520 : 0; 4521 ThreadStackSize = threadStackSizeInBytes/K; 4522 } 4523 4524 // Make the stack size a multiple of the page size so that 4525 // the yellow/red zones can be guarded. 4526 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 4527 vm_page_size())); 4528 4529 Solaris::libthread_init(); 4530 4531 if (UseNUMA) { 4532 if (!Solaris::liblgrp_init()) { 4533 UseNUMA = false; 4534 } else { 4535 size_t lgrp_limit = os::numa_get_groups_num(); 4536 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); 4537 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 4538 FREE_C_HEAP_ARRAY(int, lgrp_ids); 4539 if (lgrp_num < 2) { 4540 // There's only one locality group, disable NUMA. 4541 UseNUMA = false; 4542 } 4543 } 4544 if (!UseNUMA && ForceNUMA) { 4545 UseNUMA = true; 4546 } 4547 } 4548 4549 Solaris::signal_sets_init(); 4550 Solaris::init_signal_mem(); 4551 Solaris::install_signal_handlers(); 4552 4553 if (libjsigversion < JSIG_VERSION_1_4_1) { 4554 Maxlibjsigsigs = OLDMAXSIGNUM; 4555 } 4556 4557 // initialize synchronization primitives to use either thread or 4558 // lwp synchronization (controlled by UseLWPSynchronization) 4559 Solaris::synchronization_init(); 4560 4561 if (MaxFDLimit) { 4562 // set the number of file descriptors to max. print out error 4563 // if getrlimit/setrlimit fails but continue regardless. 4564 struct rlimit nbr_files; 4565 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 4566 if (status != 0) { 4567 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 4568 } else { 4569 nbr_files.rlim_cur = nbr_files.rlim_max; 4570 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 4571 if (status != 0) { 4572 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 4573 } 4574 } 4575 } 4576 4577 // Calculate theoretical max. size of Threads to guard gainst 4578 // artifical out-of-memory situations, where all available address- 4579 // space has been reserved by thread stacks. Default stack size is 1Mb. 4580 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 4581 JavaThread::stack_size_at_create() : (1*K*K); 4582 assert(pre_thread_stack_size != 0, "Must have a stack"); 4583 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 4584 // we should start doing Virtual Memory banging. Currently when the threads will 4585 // have used all but 200Mb of space. 4586 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 4587 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 4588 4589 // at-exit methods are called in the reverse order of their registration. 4590 // In Solaris 7 and earlier, atexit functions are called on return from 4591 // main or as a result of a call to exit(3C). There can be only 32 of 4592 // these functions registered and atexit() does not set errno. In Solaris 4593 // 8 and later, there is no limit to the number of functions registered 4594 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 4595 // functions are called upon dlclose(3DL) in addition to return from main 4596 // and exit(3C). 4597 4598 if (PerfAllowAtExitRegistration) { 4599 // only register atexit functions if PerfAllowAtExitRegistration is set. 4600 // atexit functions can be delayed until process exit time, which 4601 // can be problematic for embedded VM situations. Embedded VMs should 4602 // call DestroyJavaVM() to assure that VM resources are released. 4603 4604 // note: perfMemory_exit_helper atexit function may be removed in 4605 // the future if the appropriate cleanup code can be added to the 4606 // VM_Exit VMOperation's doit method. 4607 if (atexit(perfMemory_exit_helper) != 0) { 4608 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 4609 } 4610 } 4611 4612 // Init pset_loadavg function pointer 4613 init_pset_getloadavg_ptr(); 4614 4615 return JNI_OK; 4616} 4617 4618// Mark the polling page as unreadable 4619void os::make_polling_page_unreadable(void) { 4620 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) { 4621 fatal("Could not disable polling page"); 4622 } 4623} 4624 4625// Mark the polling page as readable 4626void os::make_polling_page_readable(void) { 4627 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) { 4628 fatal("Could not enable polling page"); 4629 } 4630} 4631 4632// OS interface. 4633 4634bool os::check_heap(bool force) { return true; } 4635 4636// Is a (classpath) directory empty? 4637bool os::dir_is_empty(const char* path) { 4638 DIR *dir = NULL; 4639 struct dirent *ptr; 4640 4641 dir = opendir(path); 4642 if (dir == NULL) return true; 4643 4644 // Scan the directory 4645 bool result = true; 4646 char buf[sizeof(struct dirent) + MAX_PATH]; 4647 struct dirent *dbuf = (struct dirent *) buf; 4648 while (result && (ptr = readdir(dir, dbuf)) != NULL) { 4649 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 4650 result = false; 4651 } 4652 } 4653 closedir(dir); 4654 return result; 4655} 4656 4657// This code originates from JDK's sysOpen and open64_w 4658// from src/solaris/hpi/src/system_md.c 4659 4660int os::open(const char *path, int oflag, int mode) { 4661 if (strlen(path) > MAX_PATH - 1) { 4662 errno = ENAMETOOLONG; 4663 return -1; 4664 } 4665 int fd; 4666 4667 fd = ::open64(path, oflag, mode); 4668 if (fd == -1) return -1; 4669 4670 // If the open succeeded, the file might still be a directory 4671 { 4672 struct stat64 buf64; 4673 int ret = ::fstat64(fd, &buf64); 4674 int st_mode = buf64.st_mode; 4675 4676 if (ret != -1) { 4677 if ((st_mode & S_IFMT) == S_IFDIR) { 4678 errno = EISDIR; 4679 ::close(fd); 4680 return -1; 4681 } 4682 } else { 4683 ::close(fd); 4684 return -1; 4685 } 4686 } 4687 4688 // 32-bit Solaris systems suffer from: 4689 // 4690 // - an historical default soft limit of 256 per-process file 4691 // descriptors that is too low for many Java programs. 4692 // 4693 // - a design flaw where file descriptors created using stdio 4694 // fopen must be less than 256, _even_ when the first limit above 4695 // has been raised. This can cause calls to fopen (but not calls to 4696 // open, for example) to fail mysteriously, perhaps in 3rd party 4697 // native code (although the JDK itself uses fopen). One can hardly 4698 // criticize them for using this most standard of all functions. 4699 // 4700 // We attempt to make everything work anyways by: 4701 // 4702 // - raising the soft limit on per-process file descriptors beyond 4703 // 256 4704 // 4705 // - As of Solaris 10u4, we can request that Solaris raise the 256 4706 // stdio fopen limit by calling function enable_extended_FILE_stdio. 4707 // This is done in init_2 and recorded in enabled_extended_FILE_stdio 4708 // 4709 // - If we are stuck on an old (pre 10u4) Solaris system, we can 4710 // workaround the bug by remapping non-stdio file descriptors below 4711 // 256 to ones beyond 256, which is done below. 4712 // 4713 // See: 4714 // 1085341: 32-bit stdio routines should support file descriptors >255 4715 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files 4716 // 6431278: Netbeans crash on 32 bit Solaris: need to call 4717 // enable_extended_FILE_stdio() in VM initialisation 4718 // Giri Mandalika's blog 4719 // http://technopark02.blogspot.com/2005_05_01_archive.html 4720 // 4721#ifndef _LP64 4722 if ((!enabled_extended_FILE_stdio) && fd < 256) { 4723 int newfd = ::fcntl(fd, F_DUPFD, 256); 4724 if (newfd != -1) { 4725 ::close(fd); 4726 fd = newfd; 4727 } 4728 } 4729#endif // 32-bit Solaris 4730 4731 // All file descriptors that are opened in the JVM and not 4732 // specifically destined for a subprocess should have the 4733 // close-on-exec flag set. If we don't set it, then careless 3rd 4734 // party native code might fork and exec without closing all 4735 // appropriate file descriptors (e.g. as we do in closeDescriptors in 4736 // UNIXProcess.c), and this in turn might: 4737 // 4738 // - cause end-of-file to fail to be detected on some file 4739 // descriptors, resulting in mysterious hangs, or 4740 // 4741 // - might cause an fopen in the subprocess to fail on a system 4742 // suffering from bug 1085341. 4743 // 4744 // (Yes, the default setting of the close-on-exec flag is a Unix 4745 // design flaw) 4746 // 4747 // See: 4748 // 1085341: 32-bit stdio routines should support file descriptors >255 4749 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 4750 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 4751 // 4752#ifdef FD_CLOEXEC 4753 { 4754 int flags = ::fcntl(fd, F_GETFD); 4755 if (flags != -1) { 4756 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 4757 } 4758 } 4759#endif 4760 4761 return fd; 4762} 4763 4764// create binary file, rewriting existing file if required 4765int os::create_binary_file(const char* path, bool rewrite_existing) { 4766 int oflags = O_WRONLY | O_CREAT; 4767 if (!rewrite_existing) { 4768 oflags |= O_EXCL; 4769 } 4770 return ::open64(path, oflags, S_IREAD | S_IWRITE); 4771} 4772 4773// return current position of file pointer 4774jlong os::current_file_offset(int fd) { 4775 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 4776} 4777 4778// move file pointer to the specified offset 4779jlong os::seek_to_file_offset(int fd, jlong offset) { 4780 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 4781} 4782 4783jlong os::lseek(int fd, jlong offset, int whence) { 4784 return (jlong) ::lseek64(fd, offset, whence); 4785} 4786 4787char * os::native_path(char *path) { 4788 return path; 4789} 4790 4791int os::ftruncate(int fd, jlong length) { 4792 return ::ftruncate64(fd, length); 4793} 4794 4795int os::fsync(int fd) { 4796 RESTARTABLE_RETURN_INT(::fsync(fd)); 4797} 4798 4799int os::available(int fd, jlong *bytes) { 4800 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 4801 "Assumed _thread_in_native"); 4802 jlong cur, end; 4803 int mode; 4804 struct stat64 buf64; 4805 4806 if (::fstat64(fd, &buf64) >= 0) { 4807 mode = buf64.st_mode; 4808 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 4809 int n,ioctl_return; 4810 4811 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return); 4812 if (ioctl_return>= 0) { 4813 *bytes = n; 4814 return 1; 4815 } 4816 } 4817 } 4818 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 4819 return 0; 4820 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 4821 return 0; 4822 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 4823 return 0; 4824 } 4825 *bytes = end - cur; 4826 return 1; 4827} 4828 4829// Map a block of memory. 4830char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4831 char *addr, size_t bytes, bool read_only, 4832 bool allow_exec) { 4833 int prot; 4834 int flags; 4835 4836 if (read_only) { 4837 prot = PROT_READ; 4838 flags = MAP_SHARED; 4839 } else { 4840 prot = PROT_READ | PROT_WRITE; 4841 flags = MAP_PRIVATE; 4842 } 4843 4844 if (allow_exec) { 4845 prot |= PROT_EXEC; 4846 } 4847 4848 if (addr != NULL) { 4849 flags |= MAP_FIXED; 4850 } 4851 4852 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 4853 fd, file_offset); 4854 if (mapped_address == MAP_FAILED) { 4855 return NULL; 4856 } 4857 return mapped_address; 4858} 4859 4860 4861// Remap a block of memory. 4862char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4863 char *addr, size_t bytes, bool read_only, 4864 bool allow_exec) { 4865 // same as map_memory() on this OS 4866 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4867 allow_exec); 4868} 4869 4870 4871// Unmap a block of memory. 4872bool os::pd_unmap_memory(char* addr, size_t bytes) { 4873 return munmap(addr, bytes) == 0; 4874} 4875 4876void os::pause() { 4877 char filename[MAX_PATH]; 4878 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4879 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4880 } else { 4881 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4882 } 4883 4884 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4885 if (fd != -1) { 4886 struct stat buf; 4887 ::close(fd); 4888 while (::stat(filename, &buf) == 0) { 4889 (void)::poll(NULL, 0, 100); 4890 } 4891 } else { 4892 jio_fprintf(stderr, 4893 "Could not open pause file '%s', continuing immediately.\n", filename); 4894 } 4895} 4896 4897#ifndef PRODUCT 4898#ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4899// Turn this on if you need to trace synch operations. 4900// Set RECORD_SYNCH_LIMIT to a large-enough value, 4901// and call record_synch_enable and record_synch_disable 4902// around the computation of interest. 4903 4904void record_synch(char* name, bool returning); // defined below 4905 4906class RecordSynch { 4907 char* _name; 4908 public: 4909 RecordSynch(char* name) :_name(name) { record_synch(_name, false); } 4910 ~RecordSynch() { record_synch(_name, true); } 4911}; 4912 4913#define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 4914extern "C" ret name params { \ 4915 typedef ret name##_t params; \ 4916 static name##_t* implem = NULL; \ 4917 static int callcount = 0; \ 4918 if (implem == NULL) { \ 4919 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 4920 if (implem == NULL) fatal(dlerror()); \ 4921 } \ 4922 ++callcount; \ 4923 RecordSynch _rs(#name); \ 4924 inner; \ 4925 return implem args; \ 4926} 4927// in dbx, examine callcounts this way: 4928// for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 4929 4930#define CHECK_POINTER_OK(p) \ 4931 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) 4932#define CHECK_MU \ 4933 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 4934#define CHECK_CV \ 4935 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 4936#define CHECK_P(p) \ 4937 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 4938 4939#define CHECK_MUTEX(mutex_op) \ 4940 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 4941 4942CHECK_MUTEX( mutex_lock) 4943CHECK_MUTEX( _mutex_lock) 4944CHECK_MUTEX( mutex_unlock) 4945CHECK_MUTEX(_mutex_unlock) 4946CHECK_MUTEX( mutex_trylock) 4947CHECK_MUTEX(_mutex_trylock) 4948 4949#define CHECK_COND(cond_op) \ 4950 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV); 4951 4952CHECK_COND( cond_wait); 4953CHECK_COND(_cond_wait); 4954CHECK_COND(_cond_wait_cancel); 4955 4956#define CHECK_COND2(cond_op) \ 4957 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV); 4958 4959CHECK_COND2( cond_timedwait); 4960CHECK_COND2(_cond_timedwait); 4961CHECK_COND2(_cond_timedwait_cancel); 4962 4963// do the _lwp_* versions too 4964#define mutex_t lwp_mutex_t 4965#define cond_t lwp_cond_t 4966CHECK_MUTEX( _lwp_mutex_lock) 4967CHECK_MUTEX( _lwp_mutex_unlock) 4968CHECK_MUTEX( _lwp_mutex_trylock) 4969CHECK_MUTEX( __lwp_mutex_lock) 4970CHECK_MUTEX( __lwp_mutex_unlock) 4971CHECK_MUTEX( __lwp_mutex_trylock) 4972CHECK_MUTEX(___lwp_mutex_lock) 4973CHECK_MUTEX(___lwp_mutex_unlock) 4974 4975CHECK_COND( _lwp_cond_wait); 4976CHECK_COND( __lwp_cond_wait); 4977CHECK_COND(___lwp_cond_wait); 4978 4979CHECK_COND2( _lwp_cond_timedwait); 4980CHECK_COND2( __lwp_cond_timedwait); 4981#undef mutex_t 4982#undef cond_t 4983 4984CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4985CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4986CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 4987CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 4988CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4989CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4990CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4991CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4992 4993 4994// recording machinery: 4995 4996enum { RECORD_SYNCH_LIMIT = 200 }; 4997char* record_synch_name[RECORD_SYNCH_LIMIT]; 4998void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 4999bool record_synch_returning[RECORD_SYNCH_LIMIT]; 5000thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 5001int record_synch_count = 0; 5002bool record_synch_enabled = false; 5003 5004// in dbx, examine recorded data this way: 5005// for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 5006 5007void record_synch(char* name, bool returning) { 5008 if (record_synch_enabled) { 5009 if (record_synch_count < RECORD_SYNCH_LIMIT) { 5010 record_synch_name[record_synch_count] = name; 5011 record_synch_returning[record_synch_count] = returning; 5012 record_synch_thread[record_synch_count] = thr_self(); 5013 record_synch_arg0ptr[record_synch_count] = &name; 5014 record_synch_count++; 5015 } 5016 // put more checking code here: 5017 // ... 5018 } 5019} 5020 5021void record_synch_enable() { 5022 // start collecting trace data, if not already doing so 5023 if (!record_synch_enabled) record_synch_count = 0; 5024 record_synch_enabled = true; 5025} 5026 5027void record_synch_disable() { 5028 // stop collecting trace data 5029 record_synch_enabled = false; 5030} 5031 5032#endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 5033#endif // PRODUCT 5034 5035const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 5036const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 5037 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 5038 5039 5040// JVMTI & JVM monitoring and management support 5041// The thread_cpu_time() and current_thread_cpu_time() are only 5042// supported if is_thread_cpu_time_supported() returns true. 5043// They are not supported on Solaris T1. 5044 5045// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 5046// are used by JVM M&M and JVMTI to get user+sys or user CPU time 5047// of a thread. 5048// 5049// current_thread_cpu_time() and thread_cpu_time(Thread *) 5050// returns the fast estimate available on the platform. 5051 5052// hrtime_t gethrvtime() return value includes 5053// user time but does not include system time 5054jlong os::current_thread_cpu_time() { 5055 return (jlong) gethrvtime(); 5056} 5057 5058jlong os::thread_cpu_time(Thread *thread) { 5059 // return user level CPU time only to be consistent with 5060 // what current_thread_cpu_time returns. 5061 // thread_cpu_time_info() must be changed if this changes 5062 return os::thread_cpu_time(thread, false /* user time only */); 5063} 5064 5065jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 5066 if (user_sys_cpu_time) { 5067 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 5068 } else { 5069 return os::current_thread_cpu_time(); 5070 } 5071} 5072 5073jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 5074 char proc_name[64]; 5075 int count; 5076 prusage_t prusage; 5077 jlong lwp_time; 5078 int fd; 5079 5080 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 5081 getpid(), 5082 thread->osthread()->lwp_id()); 5083 fd = ::open(proc_name, O_RDONLY); 5084 if (fd == -1) return -1; 5085 5086 do { 5087 count = ::pread(fd, 5088 (void *)&prusage.pr_utime, 5089 thr_time_size, 5090 thr_time_off); 5091 } while (count < 0 && errno == EINTR); 5092 ::close(fd); 5093 if (count < 0) return -1; 5094 5095 if (user_sys_cpu_time) { 5096 // user + system CPU time 5097 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 5098 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 5099 (jlong)prusage.pr_stime.tv_nsec + 5100 (jlong)prusage.pr_utime.tv_nsec; 5101 } else { 5102 // user level CPU time only 5103 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 5104 (jlong)prusage.pr_utime.tv_nsec; 5105 } 5106 5107 return (lwp_time); 5108} 5109 5110void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5111 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5112 info_ptr->may_skip_backward = false; // elapsed time not wall time 5113 info_ptr->may_skip_forward = false; // elapsed time not wall time 5114 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5115} 5116 5117void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5118 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5119 info_ptr->may_skip_backward = false; // elapsed time not wall time 5120 info_ptr->may_skip_forward = false; // elapsed time not wall time 5121 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5122} 5123 5124bool os::is_thread_cpu_time_supported() { 5125 return true; 5126} 5127 5128// System loadavg support. Returns -1 if load average cannot be obtained. 5129// Return the load average for our processor set if the primitive exists 5130// (Solaris 9 and later). Otherwise just return system wide loadavg. 5131int os::loadavg(double loadavg[], int nelem) { 5132 if (pset_getloadavg_ptr != NULL) { 5133 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 5134 } else { 5135 return ::getloadavg(loadavg, nelem); 5136 } 5137} 5138 5139//--------------------------------------------------------------------------------- 5140 5141bool os::find(address addr, outputStream* st) { 5142 Dl_info dlinfo; 5143 memset(&dlinfo, 0, sizeof(dlinfo)); 5144 if (dladdr(addr, &dlinfo) != 0) { 5145 st->print(PTR_FORMAT ": ", addr); 5146 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 5147 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 5148 } else if (dlinfo.dli_fbase != NULL) { 5149 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 5150 } else { 5151 st->print("<absolute address>"); 5152 } 5153 if (dlinfo.dli_fname != NULL) { 5154 st->print(" in %s", dlinfo.dli_fname); 5155 } 5156 if (dlinfo.dli_fbase != NULL) { 5157 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 5158 } 5159 st->cr(); 5160 5161 if (Verbose) { 5162 // decode some bytes around the PC 5163 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 5164 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 5165 address lowest = (address) dlinfo.dli_sname; 5166 if (!lowest) lowest = (address) dlinfo.dli_fbase; 5167 if (begin < lowest) begin = lowest; 5168 Dl_info dlinfo2; 5169 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 5170 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 5171 end = (address) dlinfo2.dli_saddr; 5172 } 5173 Disassembler::decode(begin, end, st); 5174 } 5175 return true; 5176 } 5177 return false; 5178} 5179 5180// Following function has been added to support HotSparc's libjvm.so running 5181// under Solaris production JDK 1.2.2 / 1.3.0. These came from 5182// src/solaris/hpi/native_threads in the EVM codebase. 5183// 5184// NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 5185// libraries and should thus be removed. We will leave it behind for a while 5186// until we no longer want to able to run on top of 1.3.0 Solaris production 5187// JDK. See 4341971. 5188 5189#define STACK_SLACK 0x800 5190 5191extern "C" { 5192 intptr_t sysThreadAvailableStackWithSlack() { 5193 stack_t st; 5194 intptr_t retval, stack_top; 5195 retval = thr_stksegment(&st); 5196 assert(retval == 0, "incorrect return value from thr_stksegment"); 5197 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 5198 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 5199 stack_top=(intptr_t)st.ss_sp-st.ss_size; 5200 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 5201 } 5202} 5203 5204// ObjectMonitor park-unpark infrastructure ... 5205// 5206// We implement Solaris and Linux PlatformEvents with the 5207// obvious condvar-mutex-flag triple. 5208// Another alternative that works quite well is pipes: 5209// Each PlatformEvent consists of a pipe-pair. 5210// The thread associated with the PlatformEvent 5211// calls park(), which reads from the input end of the pipe. 5212// Unpark() writes into the other end of the pipe. 5213// The write-side of the pipe must be set NDELAY. 5214// Unfortunately pipes consume a large # of handles. 5215// Native solaris lwp_park() and lwp_unpark() work nicely, too. 5216// Using pipes for the 1st few threads might be workable, however. 5217// 5218// park() is permitted to return spuriously. 5219// Callers of park() should wrap the call to park() in 5220// an appropriate loop. A litmus test for the correct 5221// usage of park is the following: if park() were modified 5222// to immediately return 0 your code should still work, 5223// albeit degenerating to a spin loop. 5224// 5225// In a sense, park()-unpark() just provides more polite spinning 5226// and polling with the key difference over naive spinning being 5227// that a parked thread needs to be explicitly unparked() in order 5228// to wake up and to poll the underlying condition. 5229// 5230// Assumption: 5231// Only one parker can exist on an event, which is why we allocate 5232// them per-thread. Multiple unparkers can coexist. 5233// 5234// _Event transitions in park() 5235// -1 => -1 : illegal 5236// 1 => 0 : pass - return immediately 5237// 0 => -1 : block; then set _Event to 0 before returning 5238// 5239// _Event transitions in unpark() 5240// 0 => 1 : just return 5241// 1 => 1 : just return 5242// -1 => either 0 or 1; must signal target thread 5243// That is, we can safely transition _Event from -1 to either 5244// 0 or 1. 5245// 5246// _Event serves as a restricted-range semaphore. 5247// -1 : thread is blocked, i.e. there is a waiter 5248// 0 : neutral: thread is running or ready, 5249// could have been signaled after a wait started 5250// 1 : signaled - thread is running or ready 5251// 5252// Another possible encoding of _Event would be with 5253// explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5254// 5255// TODO-FIXME: add DTRACE probes for: 5256// 1. Tx parks 5257// 2. Ty unparks Tx 5258// 3. Tx resumes from park 5259 5260 5261// value determined through experimentation 5262#define ROUNDINGFIX 11 5263 5264// utility to compute the abstime argument to timedwait. 5265// TODO-FIXME: switch from compute_abstime() to unpackTime(). 5266 5267static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 5268 // millis is the relative timeout time 5269 // abstime will be the absolute timeout time 5270 if (millis < 0) millis = 0; 5271 struct timeval now; 5272 int status = gettimeofday(&now, NULL); 5273 assert(status == 0, "gettimeofday"); 5274 jlong seconds = millis / 1000; 5275 jlong max_wait_period; 5276 5277 if (UseLWPSynchronization) { 5278 // forward port of fix for 4275818 (not sleeping long enough) 5279 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 5280 // _lwp_cond_timedwait() used a round_down algorithm rather 5281 // than a round_up. For millis less than our roundfactor 5282 // it rounded down to 0 which doesn't meet the spec. 5283 // For millis > roundfactor we may return a bit sooner, but 5284 // since we can not accurately identify the patch level and 5285 // this has already been fixed in Solaris 9 and 8 we will 5286 // leave it alone rather than always rounding down. 5287 5288 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 5289 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 5290 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 5291 max_wait_period = 21000000; 5292 } else { 5293 max_wait_period = 50000000; 5294 } 5295 millis %= 1000; 5296 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 5297 seconds = max_wait_period; 5298 } 5299 abstime->tv_sec = now.tv_sec + seconds; 5300 long usec = now.tv_usec + millis * 1000; 5301 if (usec >= 1000000) { 5302 abstime->tv_sec += 1; 5303 usec -= 1000000; 5304 } 5305 abstime->tv_nsec = usec * 1000; 5306 return abstime; 5307} 5308 5309void os::PlatformEvent::park() { // AKA: down() 5310 // Transitions for _Event: 5311 // -1 => -1 : illegal 5312 // 1 => 0 : pass - return immediately 5313 // 0 => -1 : block; then set _Event to 0 before returning 5314 5315 // Invariant: Only the thread associated with the Event/PlatformEvent 5316 // may call park(). 5317 assert(_nParked == 0, "invariant"); 5318 5319 int v; 5320 for (;;) { 5321 v = _Event; 5322 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5323 } 5324 guarantee(v >= 0, "invariant"); 5325 if (v == 0) { 5326 // Do this the hard way by blocking ... 5327 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5328 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5329 // Only for SPARC >= V8PlusA 5330#if defined(__sparc) && defined(COMPILER2) 5331 if (ClearFPUAtPark) { _mark_fpu_nosave(); } 5332#endif 5333 int status = os::Solaris::mutex_lock(_mutex); 5334 assert_status(status == 0, status, "mutex_lock"); 5335 guarantee(_nParked == 0, "invariant"); 5336 ++_nParked; 5337 while (_Event < 0) { 5338 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 5339 // Treat this the same as if the wait was interrupted 5340 // With usr/lib/lwp going to kernel, always handle ETIME 5341 status = os::Solaris::cond_wait(_cond, _mutex); 5342 if (status == ETIME) status = EINTR; 5343 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 5344 } 5345 --_nParked; 5346 _Event = 0; 5347 status = os::Solaris::mutex_unlock(_mutex); 5348 assert_status(status == 0, status, "mutex_unlock"); 5349 // Paranoia to ensure our locked and lock-free paths interact 5350 // correctly with each other. 5351 OrderAccess::fence(); 5352 } 5353} 5354 5355int os::PlatformEvent::park(jlong millis) { 5356 // Transitions for _Event: 5357 // -1 => -1 : illegal 5358 // 1 => 0 : pass - return immediately 5359 // 0 => -1 : block; then set _Event to 0 before returning 5360 5361 guarantee(_nParked == 0, "invariant"); 5362 int v; 5363 for (;;) { 5364 v = _Event; 5365 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5366 } 5367 guarantee(v >= 0, "invariant"); 5368 if (v != 0) return OS_OK; 5369 5370 int ret = OS_TIMEOUT; 5371 timestruc_t abst; 5372 compute_abstime(&abst, millis); 5373 5374 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5375 // For Solaris SPARC set fprs.FEF=0 prior to parking. 5376 // Only for SPARC >= V8PlusA 5377#if defined(__sparc) && defined(COMPILER2) 5378 if (ClearFPUAtPark) { _mark_fpu_nosave(); } 5379#endif 5380 int status = os::Solaris::mutex_lock(_mutex); 5381 assert_status(status == 0, status, "mutex_lock"); 5382 guarantee(_nParked == 0, "invariant"); 5383 ++_nParked; 5384 while (_Event < 0) { 5385 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 5386 assert_status(status == 0 || status == EINTR || 5387 status == ETIME || status == ETIMEDOUT, 5388 status, "cond_timedwait"); 5389 if (!FilterSpuriousWakeups) break; // previous semantics 5390 if (status == ETIME || status == ETIMEDOUT) break; 5391 // We consume and ignore EINTR and spurious wakeups. 5392 } 5393 --_nParked; 5394 if (_Event >= 0) ret = OS_OK; 5395 _Event = 0; 5396 status = os::Solaris::mutex_unlock(_mutex); 5397 assert_status(status == 0, status, "mutex_unlock"); 5398 // Paranoia to ensure our locked and lock-free paths interact 5399 // correctly with each other. 5400 OrderAccess::fence(); 5401 return ret; 5402} 5403 5404void os::PlatformEvent::unpark() { 5405 // Transitions for _Event: 5406 // 0 => 1 : just return 5407 // 1 => 1 : just return 5408 // -1 => either 0 or 1; must signal target thread 5409 // That is, we can safely transition _Event from -1 to either 5410 // 0 or 1. 5411 // See also: "Semaphores in Plan 9" by Mullender & Cox 5412 // 5413 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5414 // that it will take two back-to-back park() calls for the owning 5415 // thread to block. This has the benefit of forcing a spurious return 5416 // from the first park() call after an unpark() call which will help 5417 // shake out uses of park() and unpark() without condition variables. 5418 5419 if (Atomic::xchg(1, &_Event) >= 0) return; 5420 5421 // If the thread associated with the event was parked, wake it. 5422 // Wait for the thread assoc with the PlatformEvent to vacate. 5423 int status = os::Solaris::mutex_lock(_mutex); 5424 assert_status(status == 0, status, "mutex_lock"); 5425 int AnyWaiters = _nParked; 5426 status = os::Solaris::mutex_unlock(_mutex); 5427 assert_status(status == 0, status, "mutex_unlock"); 5428 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 5429 if (AnyWaiters != 0) { 5430 // Note that we signal() *after* dropping the lock for "immortal" Events. 5431 // This is safe and avoids a common class of futile wakeups. In rare 5432 // circumstances this can cause a thread to return prematurely from 5433 // cond_{timed}wait() but the spurious wakeup is benign and the victim 5434 // will simply re-test the condition and re-park itself. 5435 // This provides particular benefit if the underlying platform does not 5436 // provide wait morphing. 5437 status = os::Solaris::cond_signal(_cond); 5438 assert_status(status == 0, status, "cond_signal"); 5439 } 5440} 5441 5442// JSR166 5443// ------------------------------------------------------- 5444 5445// The solaris and linux implementations of park/unpark are fairly 5446// conservative for now, but can be improved. They currently use a 5447// mutex/condvar pair, plus _counter. 5448// Park decrements _counter if > 0, else does a condvar wait. Unpark 5449// sets count to 1 and signals condvar. Only one thread ever waits 5450// on the condvar. Contention seen when trying to park implies that someone 5451// is unparking you, so don't wait. And spurious returns are fine, so there 5452// is no need to track notifications. 5453 5454#define MAX_SECS 100000000 5455 5456// This code is common to linux and solaris and will be moved to a 5457// common place in dolphin. 5458// 5459// The passed in time value is either a relative time in nanoseconds 5460// or an absolute time in milliseconds. Either way it has to be unpacked 5461// into suitable seconds and nanoseconds components and stored in the 5462// given timespec structure. 5463// Given time is a 64-bit value and the time_t used in the timespec is only 5464// a signed-32-bit value (except on 64-bit Linux) we have to watch for 5465// overflow if times way in the future are given. Further on Solaris versions 5466// prior to 10 there is a restriction (see cond_timedwait) that the specified 5467// number of seconds, in abstime, is less than current_time + 100,000,000. 5468// As it will be 28 years before "now + 100000000" will overflow we can 5469// ignore overflow and just impose a hard-limit on seconds using the value 5470// of "now + 100,000,000". This places a limit on the timeout of about 3.17 5471// years from "now". 5472// 5473static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 5474 assert(time > 0, "convertTime"); 5475 5476 struct timeval now; 5477 int status = gettimeofday(&now, NULL); 5478 assert(status == 0, "gettimeofday"); 5479 5480 time_t max_secs = now.tv_sec + MAX_SECS; 5481 5482 if (isAbsolute) { 5483 jlong secs = time / 1000; 5484 if (secs > max_secs) { 5485 absTime->tv_sec = max_secs; 5486 } else { 5487 absTime->tv_sec = secs; 5488 } 5489 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 5490 } else { 5491 jlong secs = time / NANOSECS_PER_SEC; 5492 if (secs >= MAX_SECS) { 5493 absTime->tv_sec = max_secs; 5494 absTime->tv_nsec = 0; 5495 } else { 5496 absTime->tv_sec = now.tv_sec + secs; 5497 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 5498 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 5499 absTime->tv_nsec -= NANOSECS_PER_SEC; 5500 ++absTime->tv_sec; // note: this must be <= max_secs 5501 } 5502 } 5503 } 5504 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 5505 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 5506 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 5507 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 5508} 5509 5510void Parker::park(bool isAbsolute, jlong time) { 5511 // Ideally we'd do something useful while spinning, such 5512 // as calling unpackTime(). 5513 5514 // Optional fast-path check: 5515 // Return immediately if a permit is available. 5516 // We depend on Atomic::xchg() having full barrier semantics 5517 // since we are doing a lock-free update to _counter. 5518 if (Atomic::xchg(0, &_counter) > 0) return; 5519 5520 // Optional fast-exit: Check interrupt before trying to wait 5521 Thread* thread = Thread::current(); 5522 assert(thread->is_Java_thread(), "Must be JavaThread"); 5523 JavaThread *jt = (JavaThread *)thread; 5524 if (Thread::is_interrupted(thread, false)) { 5525 return; 5526 } 5527 5528 // First, demultiplex/decode time arguments 5529 timespec absTime; 5530 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all 5531 return; 5532 } 5533 if (time > 0) { 5534 // Warning: this code might be exposed to the old Solaris time 5535 // round-down bugs. Grep "roundingFix" for details. 5536 unpackTime(&absTime, isAbsolute, time); 5537 } 5538 5539 // Enter safepoint region 5540 // Beware of deadlocks such as 6317397. 5541 // The per-thread Parker:: _mutex is a classic leaf-lock. 5542 // In particular a thread must never block on the Threads_lock while 5543 // holding the Parker:: mutex. If safepoints are pending both the 5544 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 5545 ThreadBlockInVM tbivm(jt); 5546 5547 // Don't wait if cannot get lock since interference arises from 5548 // unblocking. Also. check interrupt before trying wait 5549 if (Thread::is_interrupted(thread, false) || 5550 os::Solaris::mutex_trylock(_mutex) != 0) { 5551 return; 5552 } 5553 5554 int status; 5555 5556 if (_counter > 0) { // no wait needed 5557 _counter = 0; 5558 status = os::Solaris::mutex_unlock(_mutex); 5559 assert(status == 0, "invariant"); 5560 // Paranoia to ensure our locked and lock-free paths interact 5561 // correctly with each other and Java-level accesses. 5562 OrderAccess::fence(); 5563 return; 5564 } 5565 5566#ifdef ASSERT 5567 // Don't catch signals while blocked; let the running threads have the signals. 5568 // (This allows a debugger to break into the running thread.) 5569 sigset_t oldsigs; 5570 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals(); 5571 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 5572#endif 5573 5574 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5575 jt->set_suspend_equivalent(); 5576 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 5577 5578 // Do this the hard way by blocking ... 5579 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5580 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5581 // Only for SPARC >= V8PlusA 5582#if defined(__sparc) && defined(COMPILER2) 5583 if (ClearFPUAtPark) { _mark_fpu_nosave(); } 5584#endif 5585 5586 if (time == 0) { 5587 status = os::Solaris::cond_wait(_cond, _mutex); 5588 } else { 5589 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 5590 } 5591 // Note that an untimed cond_wait() can sometimes return ETIME on older 5592 // versions of the Solaris. 5593 assert_status(status == 0 || status == EINTR || 5594 status == ETIME || status == ETIMEDOUT, 5595 status, "cond_timedwait"); 5596 5597#ifdef ASSERT 5598 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); 5599#endif 5600 _counter = 0; 5601 status = os::Solaris::mutex_unlock(_mutex); 5602 assert_status(status == 0, status, "mutex_unlock"); 5603 // Paranoia to ensure our locked and lock-free paths interact 5604 // correctly with each other and Java-level accesses. 5605 OrderAccess::fence(); 5606 5607 // If externally suspended while waiting, re-suspend 5608 if (jt->handle_special_suspend_equivalent_condition()) { 5609 jt->java_suspend_self(); 5610 } 5611} 5612 5613void Parker::unpark() { 5614 int status = os::Solaris::mutex_lock(_mutex); 5615 assert(status == 0, "invariant"); 5616 const int s = _counter; 5617 _counter = 1; 5618 status = os::Solaris::mutex_unlock(_mutex); 5619 assert(status == 0, "invariant"); 5620 5621 if (s < 1) { 5622 status = os::Solaris::cond_signal(_cond); 5623 assert(status == 0, "invariant"); 5624 } 5625} 5626 5627extern char** environ; 5628 5629// Run the specified command in a separate process. Return its exit value, 5630// or -1 on failure (e.g. can't fork a new process). 5631// Unlike system(), this function can be called from signal handler. It 5632// doesn't block SIGINT et al. 5633int os::fork_and_exec(char* cmd) { 5634 char * argv[4]; 5635 argv[0] = (char *)"sh"; 5636 argv[1] = (char *)"-c"; 5637 argv[2] = cmd; 5638 argv[3] = NULL; 5639 5640 // fork is async-safe, fork1 is not so can't use in signal handler 5641 pid_t pid; 5642 Thread* t = Thread::current_or_null_safe(); 5643 if (t != NULL && t->is_inside_signal_handler()) { 5644 pid = fork(); 5645 } else { 5646 pid = fork1(); 5647 } 5648 5649 if (pid < 0) { 5650 // fork failed 5651 warning("fork failed: %s", os::strerror(errno)); 5652 return -1; 5653 5654 } else if (pid == 0) { 5655 // child process 5656 5657 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 5658 execve("/usr/bin/sh", argv, environ); 5659 5660 // execve failed 5661 _exit(-1); 5662 5663 } else { 5664 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5665 // care about the actual exit code, for now. 5666 5667 int status; 5668 5669 // Wait for the child process to exit. This returns immediately if 5670 // the child has already exited. */ 5671 while (waitpid(pid, &status, 0) < 0) { 5672 switch (errno) { 5673 case ECHILD: return 0; 5674 case EINTR: break; 5675 default: return -1; 5676 } 5677 } 5678 5679 if (WIFEXITED(status)) { 5680 // The child exited normally; get its exit code. 5681 return WEXITSTATUS(status); 5682 } else if (WIFSIGNALED(status)) { 5683 // The child exited because of a signal 5684 // The best value to return is 0x80 + signal number, 5685 // because that is what all Unix shells do, and because 5686 // it allows callers to distinguish between process exit and 5687 // process death by signal. 5688 return 0x80 + WTERMSIG(status); 5689 } else { 5690 // Unknown exit code; pass it through 5691 return status; 5692 } 5693 } 5694} 5695 5696// is_headless_jre() 5697// 5698// Test for the existence of xawt/libmawt.so or libawt_xawt.so 5699// in order to report if we are running in a headless jre 5700// 5701// Since JDK8 xawt/libmawt.so was moved into the same directory 5702// as libawt.so, and renamed libawt_xawt.so 5703// 5704bool os::is_headless_jre() { 5705 struct stat statbuf; 5706 char buf[MAXPATHLEN]; 5707 char libmawtpath[MAXPATHLEN]; 5708 const char *xawtstr = "/xawt/libmawt.so"; 5709 const char *new_xawtstr = "/libawt_xawt.so"; 5710 char *p; 5711 5712 // Get path to libjvm.so 5713 os::jvm_path(buf, sizeof(buf)); 5714 5715 // Get rid of libjvm.so 5716 p = strrchr(buf, '/'); 5717 if (p == NULL) { 5718 return false; 5719 } else { 5720 *p = '\0'; 5721 } 5722 5723 // Get rid of client or server 5724 p = strrchr(buf, '/'); 5725 if (p == NULL) { 5726 return false; 5727 } else { 5728 *p = '\0'; 5729 } 5730 5731 // check xawt/libmawt.so 5732 strcpy(libmawtpath, buf); 5733 strcat(libmawtpath, xawtstr); 5734 if (::stat(libmawtpath, &statbuf) == 0) return false; 5735 5736 // check libawt_xawt.so 5737 strcpy(libmawtpath, buf); 5738 strcat(libmawtpath, new_xawtstr); 5739 if (::stat(libmawtpath, &statbuf) == 0) return false; 5740 5741 return true; 5742} 5743 5744size_t os::write(int fd, const void *buf, unsigned int nBytes) { 5745 size_t res; 5746 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res); 5747 return res; 5748} 5749 5750int os::close(int fd) { 5751 return ::close(fd); 5752} 5753 5754int os::socket_close(int fd) { 5755 return ::close(fd); 5756} 5757 5758int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5759 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5760 "Assumed _thread_in_native"); 5761 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags)); 5762} 5763 5764int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5765 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5766 "Assumed _thread_in_native"); 5767 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5768} 5769 5770int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5771 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5772} 5773 5774// As both poll and select can be interrupted by signals, we have to be 5775// prepared to restart the system call after updating the timeout, unless 5776// a poll() is done with timeout == -1, in which case we repeat with this 5777// "wait forever" value. 5778 5779int os::connect(int fd, struct sockaddr *him, socklen_t len) { 5780 int _result; 5781 _result = ::connect(fd, him, len); 5782 5783 // On Solaris, when a connect() call is interrupted, the connection 5784 // can be established asynchronously (see 6343810). Subsequent calls 5785 // to connect() must check the errno value which has the semantic 5786 // described below (copied from the connect() man page). Handling 5787 // of asynchronously established connections is required for both 5788 // blocking and non-blocking sockets. 5789 // EINTR The connection attempt was interrupted 5790 // before any data arrived by the delivery of 5791 // a signal. The connection, however, will be 5792 // established asynchronously. 5793 // 5794 // EINPROGRESS The socket is non-blocking, and the connec- 5795 // tion cannot be completed immediately. 5796 // 5797 // EALREADY The socket is non-blocking, and a previous 5798 // connection attempt has not yet been com- 5799 // pleted. 5800 // 5801 // EISCONN The socket is already connected. 5802 if (_result == OS_ERR && errno == EINTR) { 5803 // restarting a connect() changes its errno semantics 5804 RESTARTABLE(::connect(fd, him, len), _result); 5805 // undo these changes 5806 if (_result == OS_ERR) { 5807 if (errno == EALREADY) { 5808 errno = EINPROGRESS; // fall through 5809 } else if (errno == EISCONN) { 5810 errno = 0; 5811 return OS_OK; 5812 } 5813 } 5814 } 5815 return _result; 5816} 5817 5818// Get the default path to the core file 5819// Returns the length of the string 5820int os::get_core_path(char* buffer, size_t bufferSize) { 5821 const char* p = get_current_directory(buffer, bufferSize); 5822 5823 if (p == NULL) { 5824 assert(p != NULL, "failed to get current directory"); 5825 return 0; 5826 } 5827 5828 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 5829 p, current_process_id()); 5830 5831 return strlen(buffer); 5832} 5833 5834#ifndef PRODUCT 5835void TestReserveMemorySpecial_test() { 5836 // No tests available for this platform 5837} 5838#endif 5839 5840bool os::start_debugging(char *buf, int buflen) { 5841 int len = (int)strlen(buf); 5842 char *p = &buf[len]; 5843 5844 jio_snprintf(p, buflen-len, 5845 "\n\n" 5846 "Do you want to debug the problem?\n\n" 5847 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n" 5848 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 5849 "Otherwise, press RETURN to abort...", 5850 os::current_process_id(), os::current_thread_id()); 5851 5852 bool yes = os::message_box("Unexpected Error", buf); 5853 5854 if (yes) { 5855 // yes, user asked VM to launch debugger 5856 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id()); 5857 5858 os::fork_and_exec(buf); 5859 yes = false; 5860 } 5861 return yes; 5862} 5863