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