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