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 "logging/logStream.hpp" 37 #include "memory/allocation.inline.hpp" 38 #include "memory/filemap.hpp" 39 #include "oops/oop.inline.hpp" 40 #include "os_share_solaris.hpp" 41 #include "os_solaris.inline.hpp" 42 #include "prims/jniFastGetField.hpp" 43 #include "prims/jvm_misc.hpp" 44 #include "runtime/arguments.hpp" 45 #include "runtime/atomic.hpp" 46 #include "runtime/extendedPC.hpp" 47 #include "runtime/globals.hpp" 48 #include "runtime/interfaceSupport.inline.hpp" 49 #include "runtime/java.hpp" 50 #include "runtime/javaCalls.hpp" 51 #include "runtime/mutexLocker.hpp" 52 #include "runtime/objectMonitor.hpp" 53 #include "runtime/orderAccess.hpp" 54 #include "runtime/osThread.hpp" 55 #include "runtime/perfMemory.hpp" 56 #include "runtime/sharedRuntime.hpp" 57 #include "runtime/statSampler.hpp" 58 #include "runtime/stubRoutines.hpp" 59 #include "runtime/thread.inline.hpp" 60 #include "runtime/threadCritical.hpp" 61 #include "runtime/timer.hpp" 62 #include "runtime/vm_version.hpp" 63 #include "semaphore_posix.hpp" 64 #include "services/attachListener.hpp" 65 #include "services/memTracker.hpp" 66 #include "services/runtimeService.hpp" 67 #include "utilities/align.hpp" 68 #include "utilities/decoder.hpp" 69 #include "utilities/defaultStream.hpp" 70 #include "utilities/events.hpp" 71 #include "utilities/growableArray.hpp" 72 #include "utilities/macros.hpp" 73 #include "utilities/vmError.hpp" 74 75 // put OS-includes here 76 # include <dlfcn.h> 77 # include <errno.h> 78 # include <exception> 79 # include <link.h> 80 # include <poll.h> 81 # include <pthread.h> 82 # include <schedctl.h> 83 # include <setjmp.h> 84 # include <signal.h> 85 # include <stdio.h> 86 # include <alloca.h> 87 # include <sys/filio.h> 88 # include <sys/ipc.h> 89 # include <sys/lwp.h> 90 # include <sys/machelf.h> // for elf Sym structure used by dladdr1 91 # include <sys/mman.h> 92 # include <sys/processor.h> 93 # include <sys/procset.h> 94 # include <sys/pset.h> 95 # include <sys/resource.h> 96 # include <sys/shm.h> 97 # include <sys/socket.h> 98 # include <sys/stat.h> 99 # include <sys/systeminfo.h> 100 # include <sys/time.h> 101 # include <sys/times.h> 102 # include <sys/types.h> 103 # include <sys/wait.h> 104 # include <sys/utsname.h> 105 # include <thread.h> 106 # include <unistd.h> 107 # include <sys/priocntl.h> 108 # include <sys/rtpriocntl.h> 109 # include <sys/tspriocntl.h> 110 # include <sys/iapriocntl.h> 111 # include <sys/fxpriocntl.h> 112 # include <sys/loadavg.h> 113 # include <string.h> 114 # include <stdio.h> 115 116 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 117 # include <sys/procfs.h> // see comment in <sys/procfs.h> 118 119 #define MAX_PATH (2 * K) 120 121 // for timer info max values which include all bits 122 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 123 124 125 // Here are some liblgrp types from sys/lgrp_user.h to be able to 126 // compile on older systems without this header file. 127 128 #ifndef MADV_ACCESS_LWP 129 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */ 130 #endif 131 #ifndef MADV_ACCESS_MANY 132 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */ 133 #endif 134 135 #ifndef LGRP_RSRC_CPU 136 #define LGRP_RSRC_CPU 0 /* CPU resources */ 137 #endif 138 #ifndef LGRP_RSRC_MEM 139 #define LGRP_RSRC_MEM 1 /* memory resources */ 140 #endif 141 142 // Values for ThreadPriorityPolicy == 1 143 int prio_policy1[CriticalPriority+1] = { 144 -99999, 0, 16, 32, 48, 64, 145 80, 96, 112, 124, 127, 127 }; 146 147 // System parameters used internally 148 static clock_t clock_tics_per_sec = 100; 149 150 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+) 151 static bool enabled_extended_FILE_stdio = false; 152 153 // For diagnostics to print a message once. see run_periodic_checks 154 static bool check_addr0_done = false; 155 static sigset_t check_signal_done; 156 static bool check_signals = true; 157 158 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo 159 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo 160 161 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround 162 163 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL; 164 165 // "default" initializers for missing libc APIs 166 extern "C" { 167 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 168 static int lwp_mutex_destroy(mutex_t *mx) { return 0; } 169 170 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 171 static int lwp_cond_destroy(cond_t *cv) { return 0; } 172 } 173 174 // "default" initializers for pthread-based synchronization 175 extern "C" { 176 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 177 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 178 } 179 180 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); 181 182 static inline size_t adjust_stack_size(address base, size_t size) { 183 if ((ssize_t)size < 0) { 184 // 4759953: Compensate for ridiculous stack size. 185 size = max_intx; 186 } 187 if (size > (size_t)base) { 188 // 4812466: Make sure size doesn't allow the stack to wrap the address space. 189 size = (size_t)base; 190 } 191 return size; 192 } 193 194 static inline stack_t get_stack_info() { 195 stack_t st; 196 int retval = thr_stksegment(&st); 197 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); 198 assert(retval == 0, "incorrect return value from thr_stksegment"); 199 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 200 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 201 return st; 202 } 203 204 static void _handle_uncaught_cxx_exception() { 205 VMError::report_and_die("An uncaught C++ exception"); 206 } 207 208 bool os::is_primordial_thread(void) { 209 int r = thr_main(); 210 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 211 return r == 1; 212 } 213 214 address os::current_stack_base() { 215 bool _is_primordial_thread = is_primordial_thread(); 216 217 // Workaround 4352906, avoid calls to thr_stksegment by 218 // thr_main after the first one (it looks like we trash 219 // some data, causing the value for ss_sp to be incorrect). 220 if (!_is_primordial_thread || os::Solaris::_main_stack_base == NULL) { 221 stack_t st = get_stack_info(); 222 if (_is_primordial_thread) { 223 // cache initial value of stack base 224 os::Solaris::_main_stack_base = (address)st.ss_sp; 225 } 226 return (address)st.ss_sp; 227 } else { 228 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); 229 return os::Solaris::_main_stack_base; 230 } 231 } 232 233 size_t os::current_stack_size() { 234 size_t size; 235 236 if (!is_primordial_thread()) { 237 size = get_stack_info().ss_size; 238 } else { 239 struct rlimit limits; 240 getrlimit(RLIMIT_STACK, &limits); 241 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); 242 } 243 // base may not be page aligned 244 address base = current_stack_base(); 245 address bottom = align_up(base - size, os::vm_page_size());; 246 return (size_t)(base - bottom); 247 } 248 249 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 250 return localtime_r(clock, res); 251 } 252 253 void os::Solaris::try_enable_extended_io() { 254 typedef int (*enable_extended_FILE_stdio_t)(int, int); 255 256 if (!UseExtendedFileIO) { 257 return; 258 } 259 260 enable_extended_FILE_stdio_t enabler = 261 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT, 262 "enable_extended_FILE_stdio"); 263 if (enabler) { 264 enabler(-1, -1); 265 } 266 } 267 268 static int _processors_online = 0; 269 270 jint os::Solaris::_os_thread_limit = 0; 271 volatile jint os::Solaris::_os_thread_count = 0; 272 273 julong os::available_memory() { 274 return Solaris::available_memory(); 275 } 276 277 julong os::Solaris::available_memory() { 278 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); 279 } 280 281 julong os::Solaris::_physical_memory = 0; 282 283 julong os::physical_memory() { 284 return Solaris::physical_memory(); 285 } 286 287 static hrtime_t first_hrtime = 0; 288 static const hrtime_t hrtime_hz = 1000*1000*1000; 289 static volatile hrtime_t max_hrtime = 0; 290 291 292 void os::Solaris::initialize_system_info() { 293 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); 294 _processors_online = sysconf(_SC_NPROCESSORS_ONLN); 295 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * 296 (julong)sysconf(_SC_PAGESIZE); 297 } 298 299 uint os::processor_id() { 300 const processorid_t id = ::getcpuid(); 301 assert(id >= 0 && id < _processor_count, "Invalid processor id"); 302 return (uint)id; 303 } 304 305 int os::active_processor_count() { 306 // User has overridden the number of active processors 307 if (ActiveProcessorCount > 0) { 308 log_trace(os)("active_processor_count: " 309 "active processor count set by user : %d", 310 ActiveProcessorCount); 311 return ActiveProcessorCount; 312 } 313 314 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 315 pid_t pid = getpid(); 316 psetid_t pset = PS_NONE; 317 // Are we running in a processor set or is there any processor set around? 318 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) { 319 uint_t pset_cpus; 320 // Query the number of cpus available to us. 321 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) { 322 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check"); 323 _processors_online = pset_cpus; 324 return pset_cpus; 325 } 326 } 327 // Otherwise return number of online cpus 328 return online_cpus; 329 } 330 331 static bool find_processors_in_pset(psetid_t pset, 332 processorid_t** id_array, 333 uint_t* id_length) { 334 bool result = false; 335 // Find the number of processors in the processor set. 336 if (pset_info(pset, NULL, id_length, NULL) == 0) { 337 // Make up an array to hold their ids. 338 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 339 // Fill in the array with their processor ids. 340 if (pset_info(pset, NULL, id_length, *id_array) == 0) { 341 result = true; 342 } 343 } 344 return result; 345 } 346 347 // Callers of find_processors_online() must tolerate imprecise results -- 348 // the system configuration can change asynchronously because of DR 349 // or explicit psradm operations. 350 // 351 // We also need to take care that the loop (below) terminates as the 352 // number of processors online can change between the _SC_NPROCESSORS_ONLN 353 // request and the loop that builds the list of processor ids. Unfortunately 354 // there's no reliable way to determine the maximum valid processor id, 355 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online 356 // man pages, which claim the processor id set is "sparse, but 357 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually 358 // exit the loop. 359 // 360 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's 361 // not available on S8.0. 362 363 static bool find_processors_online(processorid_t** id_array, 364 uint* id_length) { 365 const processorid_t MAX_PROCESSOR_ID = 100000; 366 // Find the number of processors online. 367 *id_length = sysconf(_SC_NPROCESSORS_ONLN); 368 // Make up an array to hold their ids. 369 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 370 // Processors need not be numbered consecutively. 371 long found = 0; 372 processorid_t next = 0; 373 while (found < *id_length && next < MAX_PROCESSOR_ID) { 374 processor_info_t info; 375 if (processor_info(next, &info) == 0) { 376 // NB, PI_NOINTR processors are effectively online ... 377 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) { 378 (*id_array)[found] = next; 379 found += 1; 380 } 381 } 382 next += 1; 383 } 384 if (found < *id_length) { 385 // The loop above didn't identify the expected number of processors. 386 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN) 387 // and re-running the loop, above, but there's no guarantee of progress 388 // if the system configuration is in flux. Instead, we just return what 389 // we've got. Note that in the worst case find_processors_online() could 390 // return an empty set. (As a fall-back in the case of the empty set we 391 // could just return the ID of the current processor). 392 *id_length = found; 393 } 394 395 return true; 396 } 397 398 static bool assign_distribution(processorid_t* id_array, 399 uint id_length, 400 uint* distribution, 401 uint distribution_length) { 402 // We assume we can assign processorid_t's to uint's. 403 assert(sizeof(processorid_t) == sizeof(uint), 404 "can't convert processorid_t to uint"); 405 // Quick check to see if we won't succeed. 406 if (id_length < distribution_length) { 407 return false; 408 } 409 // Assign processor ids to the distribution. 410 // Try to shuffle processors to distribute work across boards, 411 // assuming 4 processors per board. 412 const uint processors_per_board = ProcessDistributionStride; 413 // Find the maximum processor id. 414 processorid_t max_id = 0; 415 for (uint m = 0; m < id_length; m += 1) { 416 max_id = MAX2(max_id, id_array[m]); 417 } 418 // The next id, to limit loops. 419 const processorid_t limit_id = max_id + 1; 420 // Make up markers for available processors. 421 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal); 422 for (uint c = 0; c < limit_id; c += 1) { 423 available_id[c] = false; 424 } 425 for (uint a = 0; a < id_length; a += 1) { 426 available_id[id_array[a]] = true; 427 } 428 // Step by "boards", then by "slot", copying to "assigned". 429 // NEEDS_CLEANUP: The assignment of processors should be stateful, 430 // remembering which processors have been assigned by 431 // previous calls, etc., so as to distribute several 432 // independent calls of this method. What we'd like is 433 // It would be nice to have an API that let us ask 434 // how many processes are bound to a processor, 435 // but we don't have that, either. 436 // In the short term, "board" is static so that 437 // subsequent distributions don't all start at board 0. 438 static uint board = 0; 439 uint assigned = 0; 440 // Until we've found enough processors .... 441 while (assigned < distribution_length) { 442 // ... find the next available processor in the board. 443 for (uint slot = 0; slot < processors_per_board; slot += 1) { 444 uint try_id = board * processors_per_board + slot; 445 if ((try_id < limit_id) && (available_id[try_id] == true)) { 446 distribution[assigned] = try_id; 447 available_id[try_id] = false; 448 assigned += 1; 449 break; 450 } 451 } 452 board += 1; 453 if (board * processors_per_board + 0 >= limit_id) { 454 board = 0; 455 } 456 } 457 if (available_id != NULL) { 458 FREE_C_HEAP_ARRAY(bool, available_id); 459 } 460 return true; 461 } 462 463 void os::set_native_thread_name(const char *name) { 464 if (Solaris::_pthread_setname_np != NULL) { 465 // Only the first 31 bytes of 'name' are processed by pthread_setname_np 466 // but we explicitly copy into a size-limited buffer to avoid any 467 // possible overflow. 468 char buf[32]; 469 snprintf(buf, sizeof(buf), "%s", name); 470 buf[sizeof(buf) - 1] = '\0'; 471 Solaris::_pthread_setname_np(pthread_self(), buf); 472 } 473 } 474 475 bool os::distribute_processes(uint length, uint* distribution) { 476 bool result = false; 477 // Find the processor id's of all the available CPUs. 478 processorid_t* id_array = NULL; 479 uint id_length = 0; 480 // There are some races between querying information and using it, 481 // since processor sets can change dynamically. 482 psetid_t pset = PS_NONE; 483 // Are we running in a processor set? 484 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) { 485 result = find_processors_in_pset(pset, &id_array, &id_length); 486 } else { 487 result = find_processors_online(&id_array, &id_length); 488 } 489 if (result == true) { 490 if (id_length >= length) { 491 result = assign_distribution(id_array, id_length, distribution, length); 492 } else { 493 result = false; 494 } 495 } 496 if (id_array != NULL) { 497 FREE_C_HEAP_ARRAY(processorid_t, id_array); 498 } 499 return result; 500 } 501 502 bool os::bind_to_processor(uint processor_id) { 503 // We assume that a processorid_t can be stored in a uint. 504 assert(sizeof(uint) == sizeof(processorid_t), 505 "can't convert uint to processorid_t"); 506 int bind_result = 507 processor_bind(P_LWPID, // bind LWP. 508 P_MYID, // bind current LWP. 509 (processorid_t) processor_id, // id. 510 NULL); // don't return old binding. 511 return (bind_result == 0); 512 } 513 514 // Return true if user is running as root. 515 516 bool os::have_special_privileges() { 517 static bool init = false; 518 static bool privileges = false; 519 if (!init) { 520 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 521 init = true; 522 } 523 return privileges; 524 } 525 526 527 void os::init_system_properties_values() { 528 // The next steps are taken in the product version: 529 // 530 // Obtain the JAVA_HOME value from the location of libjvm.so. 531 // This library should be located at: 532 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 533 // 534 // If "/jre/lib/" appears at the right place in the path, then we 535 // assume libjvm.so is installed in a JDK and we use this path. 536 // 537 // Otherwise exit with message: "Could not create the Java virtual machine." 538 // 539 // The following extra steps are taken in the debugging version: 540 // 541 // If "/jre/lib/" does NOT appear at the right place in the path 542 // instead of exit check for $JAVA_HOME environment variable. 543 // 544 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 545 // then we append a fake suffix "hotspot/libjvm.so" to this path so 546 // it looks like libjvm.so is installed there 547 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 548 // 549 // Otherwise exit. 550 // 551 // Important note: if the location of libjvm.so changes this 552 // code needs to be changed accordingly. 553 554 // Base path of extensions installed on the system. 555 #define SYS_EXT_DIR "/usr/jdk/packages" 556 #define EXTENSIONS_DIR "/lib/ext" 557 558 // Buffer that fits several sprintfs. 559 // Note that the space for the colon and the trailing null are provided 560 // by the nulls included by the sizeof operator. 561 const size_t bufsize = 562 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends. 563 sizeof(SYS_EXT_DIR) + sizeof("/lib/"), // invariant ld_library_path 564 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir 565 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 566 567 // sysclasspath, java_home, dll_dir 568 { 569 char *pslash; 570 os::jvm_path(buf, bufsize); 571 572 // Found the full path to libjvm.so. 573 // Now cut the path to <java_home>/jre if we can. 574 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 575 pslash = strrchr(buf, '/'); 576 if (pslash != NULL) { 577 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 578 } 579 Arguments::set_dll_dir(buf); 580 581 if (pslash != NULL) { 582 pslash = strrchr(buf, '/'); 583 if (pslash != NULL) { 584 *pslash = '\0'; // Get rid of /lib. 585 } 586 } 587 Arguments::set_java_home(buf); 588 set_boot_path('/', ':'); 589 } 590 591 // Where to look for native libraries. 592 { 593 // Use dlinfo() to determine the correct java.library.path. 594 // 595 // If we're launched by the Java launcher, and the user 596 // does not set java.library.path explicitly on the commandline, 597 // the Java launcher sets LD_LIBRARY_PATH for us and unsets 598 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case 599 // dlinfo returns LD_LIBRARY_PATH + crle settings (including 600 // /usr/lib), which is exactly what we want. 601 // 602 // If the user does set java.library.path, it completely 603 // overwrites this setting, and always has. 604 // 605 // If we're not launched by the Java launcher, we may 606 // get here with any/all of the LD_LIBRARY_PATH[_32|64] 607 // settings. Again, dlinfo does exactly what we want. 608 609 Dl_serinfo info_sz, *info = &info_sz; 610 Dl_serpath *path; 611 char *library_path; 612 char *common_path = buf; 613 614 // Determine search path count and required buffer size. 615 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) { 616 FREE_C_HEAP_ARRAY(char, buf); 617 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror()); 618 } 619 620 // Allocate new buffer and initialize. 621 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal); 622 info->dls_size = info_sz.dls_size; 623 info->dls_cnt = info_sz.dls_cnt; 624 625 // Obtain search path information. 626 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) { 627 FREE_C_HEAP_ARRAY(char, buf); 628 FREE_C_HEAP_ARRAY(char, info); 629 vm_exit_during_initialization("dlinfo SERINFO request", dlerror()); 630 } 631 632 path = &info->dls_serpath[0]; 633 634 // Note: Due to a legacy implementation, most of the library path 635 // is set in the launcher. This was to accomodate linking restrictions 636 // on legacy Solaris implementations (which are no longer supported). 637 // Eventually, all the library path setting will be done here. 638 // 639 // However, to prevent the proliferation of improperly built native 640 // libraries, the new path component /usr/jdk/packages is added here. 641 642 // Construct the invariant part of ld_library_path. 643 sprintf(common_path, SYS_EXT_DIR "/lib"); 644 645 // Struct size is more than sufficient for the path components obtained 646 // through the dlinfo() call, so only add additional space for the path 647 // components explicitly added here. 648 size_t library_path_size = info->dls_size + strlen(common_path); 649 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal); 650 library_path[0] = '\0'; 651 652 // Construct the desired Java library path from the linker's library 653 // search path. 654 // 655 // For compatibility, it is optimal that we insert the additional path 656 // components specific to the Java VM after those components specified 657 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so 658 // infrastructure. 659 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it. 660 strcpy(library_path, common_path); 661 } else { 662 int inserted = 0; 663 int i; 664 for (i = 0; i < info->dls_cnt; i++, path++) { 665 uint_t flags = path->dls_flags & LA_SER_MASK; 666 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) { 667 strcat(library_path, common_path); 668 strcat(library_path, os::path_separator()); 669 inserted = 1; 670 } 671 strcat(library_path, path->dls_name); 672 strcat(library_path, os::path_separator()); 673 } 674 // Eliminate trailing path separator. 675 library_path[strlen(library_path)-1] = '\0'; 676 } 677 678 // happens before argument parsing - can't use a trace flag 679 // tty->print_raw("init_system_properties_values: native lib path: "); 680 // tty->print_raw_cr(library_path); 681 682 // Callee copies into its own buffer. 683 Arguments::set_library_path(library_path); 684 685 FREE_C_HEAP_ARRAY(char, library_path); 686 FREE_C_HEAP_ARRAY(char, info); 687 } 688 689 // Extensions directories. 690 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); 691 Arguments::set_ext_dirs(buf); 692 693 FREE_C_HEAP_ARRAY(char, buf); 694 695 #undef SYS_EXT_DIR 696 #undef EXTENSIONS_DIR 697 } 698 699 void os::breakpoint() { 700 BREAKPOINT; 701 } 702 703 bool os::obsolete_option(const JavaVMOption *option) { 704 if (!strncmp(option->optionString, "-Xt", 3)) { 705 return true; 706 } else if (!strncmp(option->optionString, "-Xtm", 4)) { 707 return true; 708 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) { 709 return true; 710 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) { 711 return true; 712 } 713 return false; 714 } 715 716 bool os::Solaris::valid_stack_address(Thread* thread, address sp) { 717 address stackStart = (address)thread->stack_base(); 718 address stackEnd = (address)(stackStart - (address)thread->stack_size()); 719 if (sp < stackStart && sp >= stackEnd) return true; 720 return false; 721 } 722 723 extern "C" void breakpoint() { 724 // use debugger to set breakpoint here 725 } 726 727 static thread_t main_thread; 728 729 // Thread start routine for all newly created threads 730 extern "C" void* thread_native_entry(void* thread_addr) { 731 732 Thread* thread = (Thread*)thread_addr; 733 734 thread->record_stack_base_and_size(); 735 736 // Try to randomize the cache line index of hot stack frames. 737 // This helps when threads of the same stack traces evict each other's 738 // cache lines. The threads can be either from the same JVM instance, or 739 // from different JVM instances. The benefit is especially true for 740 // processors with hyperthreading technology. 741 static int counter = 0; 742 int pid = os::current_process_id(); 743 alloca(((pid ^ counter++) & 7) * 128); 744 745 int prio; 746 747 thread->initialize_thread_current(); 748 749 OSThread* osthr = thread->osthread(); 750 751 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound 752 thread->_schedctl = (void *) schedctl_init(); 753 754 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", 755 os::current_thread_id()); 756 757 if (UseNUMA) { 758 int lgrp_id = os::numa_get_group_id(); 759 if (lgrp_id != -1) { 760 thread->set_lgrp_id(lgrp_id); 761 } 762 } 763 764 // Our priority was set when we were created, and stored in the 765 // osthread, but couldn't be passed through to our LWP until now. 766 // So read back the priority and set it again. 767 768 if (osthr->thread_id() != -1) { 769 if (UseThreadPriorities) { 770 int prio = osthr->native_priority(); 771 if (ThreadPriorityVerbose) { 772 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " 773 INTPTR_FORMAT ", setting priority: %d\n", 774 osthr->thread_id(), osthr->lwp_id(), prio); 775 } 776 os::set_native_priority(thread, prio); 777 } 778 } else if (ThreadPriorityVerbose) { 779 warning("Can't set priority in _start routine, thread id hasn't been set\n"); 780 } 781 782 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 783 784 // initialize signal mask for this thread 785 os::Solaris::hotspot_sigmask(thread); 786 787 os::Solaris::init_thread_fpu_state(); 788 std::set_terminate(_handle_uncaught_cxx_exception); 789 790 thread->call_run(); 791 792 // Note: at this point the thread object may already have deleted itself. 793 // Do not dereference it from here on out. 794 795 // One less thread is executing 796 // When the VMThread gets here, the main thread may have already exited 797 // which frees the CodeHeap containing the Atomic::dec code 798 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 799 Atomic::dec(&os::Solaris::_os_thread_count); 800 } 801 802 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id()); 803 804 if (UseDetachedThreads) { 805 thr_exit(NULL); 806 ShouldNotReachHere(); 807 } 808 return NULL; 809 } 810 811 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) { 812 // Allocate the OSThread object 813 OSThread* osthread = new OSThread(NULL, NULL); 814 if (osthread == NULL) return NULL; 815 816 // Store info on the Solaris thread into the OSThread 817 osthread->set_thread_id(thread_id); 818 osthread->set_lwp_id(_lwp_self()); 819 thread->_schedctl = (void *) schedctl_init(); 820 821 if (UseNUMA) { 822 int lgrp_id = os::numa_get_group_id(); 823 if (lgrp_id != -1) { 824 thread->set_lgrp_id(lgrp_id); 825 } 826 } 827 828 if (ThreadPriorityVerbose) { 829 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n", 830 osthread->thread_id(), osthread->lwp_id()); 831 } 832 833 // Initial thread state is INITIALIZED, not SUSPENDED 834 osthread->set_state(INITIALIZED); 835 836 return osthread; 837 } 838 839 void os::Solaris::hotspot_sigmask(Thread* thread) { 840 //Save caller's signal mask 841 sigset_t sigmask; 842 pthread_sigmask(SIG_SETMASK, NULL, &sigmask); 843 OSThread *osthread = thread->osthread(); 844 osthread->set_caller_sigmask(sigmask); 845 846 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL); 847 if (!ReduceSignalUsage) { 848 if (thread->is_VM_thread()) { 849 // Only the VM thread handles BREAK_SIGNAL ... 850 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 851 } else { 852 // ... all other threads block BREAK_SIGNAL 853 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked"); 854 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 855 } 856 } 857 } 858 859 bool os::create_attached_thread(JavaThread* thread) { 860 #ifdef ASSERT 861 thread->verify_not_published(); 862 #endif 863 OSThread* osthread = create_os_thread(thread, thr_self()); 864 if (osthread == NULL) { 865 return false; 866 } 867 868 // Initial thread state is RUNNABLE 869 osthread->set_state(RUNNABLE); 870 thread->set_osthread(osthread); 871 872 // initialize signal mask for this thread 873 // and save the caller's signal mask 874 os::Solaris::hotspot_sigmask(thread); 875 876 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").", 877 os::current_thread_id()); 878 879 return true; 880 } 881 882 bool os::create_main_thread(JavaThread* thread) { 883 #ifdef ASSERT 884 thread->verify_not_published(); 885 #endif 886 if (_starting_thread == NULL) { 887 _starting_thread = create_os_thread(thread, main_thread); 888 if (_starting_thread == NULL) { 889 return false; 890 } 891 } 892 893 // The primodial thread is runnable from the start 894 _starting_thread->set_state(RUNNABLE); 895 896 thread->set_osthread(_starting_thread); 897 898 // initialize signal mask for this thread 899 // and save the caller's signal mask 900 os::Solaris::hotspot_sigmask(thread); 901 902 return true; 903 } 904 905 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr() 906 static char* describe_thr_create_attributes(char* buf, size_t buflen, 907 size_t stacksize, long flags) { 908 stringStream ss(buf, buflen); 909 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024); 910 ss.print("flags: "); 911 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " "); 912 #define ALL(X) \ 913 X(THR_SUSPENDED) \ 914 X(THR_DETACHED) \ 915 X(THR_BOUND) \ 916 X(THR_NEW_LWP) \ 917 X(THR_DAEMON) 918 ALL(PRINT_FLAG) 919 #undef ALL 920 #undef PRINT_FLAG 921 return buf; 922 } 923 924 // return default stack size for thr_type 925 size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 926 // default stack size when not specified by caller is 1M (2M for LP64) 927 size_t s = (BytesPerWord >> 2) * K * K; 928 return s; 929 } 930 931 bool os::create_thread(Thread* thread, ThreadType thr_type, 932 size_t req_stack_size) { 933 // Allocate the OSThread object 934 OSThread* osthread = new OSThread(NULL, NULL); 935 if (osthread == NULL) { 936 return false; 937 } 938 939 if (ThreadPriorityVerbose) { 940 char *thrtyp; 941 switch (thr_type) { 942 case vm_thread: 943 thrtyp = (char *)"vm"; 944 break; 945 case cgc_thread: 946 thrtyp = (char *)"cgc"; 947 break; 948 case pgc_thread: 949 thrtyp = (char *)"pgc"; 950 break; 951 case java_thread: 952 thrtyp = (char *)"java"; 953 break; 954 case compiler_thread: 955 thrtyp = (char *)"compiler"; 956 break; 957 case watcher_thread: 958 thrtyp = (char *)"watcher"; 959 break; 960 default: 961 thrtyp = (char *)"unknown"; 962 break; 963 } 964 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp); 965 } 966 967 // calculate stack size if it's not specified by caller 968 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 969 970 // Initial state is ALLOCATED but not INITIALIZED 971 osthread->set_state(ALLOCATED); 972 973 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) { 974 // We got lots of threads. Check if we still have some address space left. 975 // Need to be at least 5Mb of unreserved address space. We do check by 976 // trying to reserve some. 977 const size_t VirtualMemoryBangSize = 20*K*K; 978 char* mem = os::reserve_memory(VirtualMemoryBangSize); 979 if (mem == NULL) { 980 delete osthread; 981 return false; 982 } else { 983 // Release the memory again 984 os::release_memory(mem, VirtualMemoryBangSize); 985 } 986 } 987 988 // Setup osthread because the child thread may need it. 989 thread->set_osthread(osthread); 990 991 // Create the Solaris thread 992 thread_t tid = 0; 993 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED; 994 int status; 995 996 // Mark that we don't have an lwp or thread id yet. 997 // In case we attempt to set the priority before the thread starts. 998 osthread->set_lwp_id(-1); 999 osthread->set_thread_id(-1); 1000 1001 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid); 1002 1003 char buf[64]; 1004 if (status == 0) { 1005 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ", 1006 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 1007 } else { 1008 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.", 1009 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 1010 // Log some OS information which might explain why creating the thread failed. 1011 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads()); 1012 LogStream st(Log(os, thread)::info()); 1013 os::Posix::print_rlimit_info(&st); 1014 os::print_memory_info(&st); 1015 } 1016 1017 if (status != 0) { 1018 thread->set_osthread(NULL); 1019 // Need to clean up stuff we've allocated so far 1020 delete osthread; 1021 return false; 1022 } 1023 1024 Atomic::inc(&os::Solaris::_os_thread_count); 1025 1026 // Store info on the Solaris thread into the OSThread 1027 osthread->set_thread_id(tid); 1028 1029 // Remember that we created this thread so we can set priority on it 1030 osthread->set_vm_created(); 1031 1032 // Most thread types will set an explicit priority before starting the thread, 1033 // but for those that don't we need a valid value to read back in thread_native_entry. 1034 osthread->set_native_priority(NormPriority); 1035 1036 // Initial thread state is INITIALIZED, not SUSPENDED 1037 osthread->set_state(INITIALIZED); 1038 1039 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 1040 return true; 1041 } 1042 1043 debug_only(static bool signal_sets_initialized = false); 1044 static sigset_t unblocked_sigs, vm_sigs; 1045 1046 void os::Solaris::signal_sets_init() { 1047 // Should also have an assertion stating we are still single-threaded. 1048 assert(!signal_sets_initialized, "Already initialized"); 1049 // Fill in signals that are necessarily unblocked for all threads in 1050 // the VM. Currently, we unblock the following signals: 1051 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 1052 // by -Xrs (=ReduceSignalUsage)); 1053 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 1054 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 1055 // the dispositions or masks wrt these signals. 1056 // Programs embedding the VM that want to use the above signals for their 1057 // own purposes must, at this time, use the "-Xrs" option to prevent 1058 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 1059 // (See bug 4345157, and other related bugs). 1060 // In reality, though, unblocking these signals is really a nop, since 1061 // these signals are not blocked by default. 1062 sigemptyset(&unblocked_sigs); 1063 sigaddset(&unblocked_sigs, SIGILL); 1064 sigaddset(&unblocked_sigs, SIGSEGV); 1065 sigaddset(&unblocked_sigs, SIGBUS); 1066 sigaddset(&unblocked_sigs, SIGFPE); 1067 sigaddset(&unblocked_sigs, ASYNC_SIGNAL); 1068 1069 if (!ReduceSignalUsage) { 1070 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 1071 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 1072 } 1073 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 1074 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 1075 } 1076 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 1077 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 1078 } 1079 } 1080 // Fill in signals that are blocked by all but the VM thread. 1081 sigemptyset(&vm_sigs); 1082 if (!ReduceSignalUsage) { 1083 sigaddset(&vm_sigs, BREAK_SIGNAL); 1084 } 1085 debug_only(signal_sets_initialized = true); 1086 1087 // For diagnostics only used in run_periodic_checks 1088 sigemptyset(&check_signal_done); 1089 } 1090 1091 // These are signals that are unblocked while a thread is running Java. 1092 // (For some reason, they get blocked by default.) 1093 sigset_t* os::Solaris::unblocked_signals() { 1094 assert(signal_sets_initialized, "Not initialized"); 1095 return &unblocked_sigs; 1096 } 1097 1098 // These are the signals that are blocked while a (non-VM) thread is 1099 // running Java. Only the VM thread handles these signals. 1100 sigset_t* os::Solaris::vm_signals() { 1101 assert(signal_sets_initialized, "Not initialized"); 1102 return &vm_sigs; 1103 } 1104 1105 // CR 7190089: on Solaris, primordial thread's stack needs adjusting. 1106 // Without the adjustment, stack size is incorrect if stack is set to unlimited (ulimit -s unlimited). 1107 void os::Solaris::correct_stack_boundaries_for_primordial_thread(Thread* thr) { 1108 assert(is_primordial_thread(), "Call only for primordial thread"); 1109 1110 JavaThread* jt = (JavaThread *)thr; 1111 assert(jt != NULL, "Sanity check"); 1112 size_t stack_size; 1113 address base = jt->stack_base(); 1114 if (Arguments::created_by_java_launcher()) { 1115 // Use 2MB to allow for Solaris 7 64 bit mode. 1116 stack_size = JavaThread::stack_size_at_create() == 0 1117 ? 2048*K : JavaThread::stack_size_at_create(); 1118 1119 // There are rare cases when we may have already used more than 1120 // the basic stack size allotment before this method is invoked. 1121 // Attempt to allow for a normally sized java_stack. 1122 size_t current_stack_offset = (size_t)(base - (address)&stack_size); 1123 stack_size += ReservedSpace::page_align_size_down(current_stack_offset); 1124 } else { 1125 // 6269555: If we were not created by a Java launcher, i.e. if we are 1126 // running embedded in a native application, treat the primordial thread 1127 // as much like a native attached thread as possible. This means using 1128 // the current stack size from thr_stksegment(), unless it is too large 1129 // to reliably setup guard pages. A reasonable max size is 8MB. 1130 size_t current_size = os::current_stack_size(); 1131 // This should never happen, but just in case.... 1132 if (current_size == 0) current_size = 2 * K * K; 1133 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size; 1134 } 1135 address bottom = align_up(base - stack_size, os::vm_page_size());; 1136 stack_size = (size_t)(base - bottom); 1137 1138 assert(stack_size > 0, "Stack size calculation problem"); 1139 1140 if (stack_size > jt->stack_size()) { 1141 #ifndef PRODUCT 1142 struct rlimit limits; 1143 getrlimit(RLIMIT_STACK, &limits); 1144 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur); 1145 assert(size >= jt->stack_size(), "Stack size problem in main thread"); 1146 #endif 1147 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n" 1148 "(Stack sizes are rounded up to a multiple of the system page size.)\n" 1149 "See limit(1) to increase the stack size limit.", 1150 stack_size / K, jt->stack_size() / K); 1151 vm_exit(1); 1152 } 1153 assert(jt->stack_size() >= stack_size, 1154 "Attempt to map more stack than was allocated"); 1155 jt->set_stack_size(stack_size); 1156 1157 } 1158 1159 1160 1161 // Free Solaris resources related to the OSThread 1162 void os::free_thread(OSThread* osthread) { 1163 assert(osthread != NULL, "os::free_thread but osthread not set"); 1164 1165 // We are told to free resources of the argument thread, 1166 // but we can only really operate on the current thread. 1167 assert(Thread::current()->osthread() == osthread, 1168 "os::free_thread but not current thread"); 1169 1170 // Restore caller's signal mask 1171 sigset_t sigmask = osthread->caller_sigmask(); 1172 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 1173 1174 delete osthread; 1175 } 1176 1177 void os::pd_start_thread(Thread* thread) { 1178 int status = thr_continue(thread->osthread()->thread_id()); 1179 assert_status(status == 0, status, "thr_continue failed"); 1180 } 1181 1182 1183 intx os::current_thread_id() { 1184 return (intx)thr_self(); 1185 } 1186 1187 static pid_t _initial_pid = 0; 1188 1189 int os::current_process_id() { 1190 return (int)(_initial_pid ? _initial_pid : getpid()); 1191 } 1192 1193 // gethrtime() should be monotonic according to the documentation, 1194 // but some virtualized platforms are known to break this guarantee. 1195 // getTimeNanos() must be guaranteed not to move backwards, so we 1196 // are forced to add a check here. 1197 inline hrtime_t getTimeNanos() { 1198 const hrtime_t now = gethrtime(); 1199 const hrtime_t prev = max_hrtime; 1200 if (now <= prev) { 1201 return prev; // same or retrograde time; 1202 } 1203 const hrtime_t obsv = Atomic::cmpxchg(now, &max_hrtime, prev); 1204 assert(obsv >= prev, "invariant"); // Monotonicity 1205 // If the CAS succeeded then we're done and return "now". 1206 // If the CAS failed and the observed value "obsv" is >= now then 1207 // we should return "obsv". If the CAS failed and now > obsv > prv then 1208 // some other thread raced this thread and installed a new value, in which case 1209 // we could either (a) retry the entire operation, (b) retry trying to install now 1210 // or (c) just return obsv. We use (c). No loop is required although in some cases 1211 // we might discard a higher "now" value in deference to a slightly lower but freshly 1212 // installed obsv value. That's entirely benign -- it admits no new orderings compared 1213 // to (a) or (b) -- and greatly reduces coherence traffic. 1214 // We might also condition (c) on the magnitude of the delta between obsv and now. 1215 // Avoiding excessive CAS operations to hot RW locations is critical. 1216 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 1217 return (prev == obsv) ? now : obsv; 1218 } 1219 1220 // Time since start-up in seconds to a fine granularity. 1221 // Used by VMSelfDestructTimer and the MemProfiler. 1222 double os::elapsedTime() { 1223 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1224 } 1225 1226 jlong os::elapsed_counter() { 1227 return (jlong)(getTimeNanos() - first_hrtime); 1228 } 1229 1230 jlong os::elapsed_frequency() { 1231 return hrtime_hz; 1232 } 1233 1234 // Return the real, user, and system times in seconds from an 1235 // arbitrary fixed point in the past. 1236 bool os::getTimesSecs(double* process_real_time, 1237 double* process_user_time, 1238 double* process_system_time) { 1239 struct tms ticks; 1240 clock_t real_ticks = times(&ticks); 1241 1242 if (real_ticks == (clock_t) (-1)) { 1243 return false; 1244 } else { 1245 double ticks_per_second = (double) clock_tics_per_sec; 1246 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1247 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1248 // For consistency return the real time from getTimeNanos() 1249 // converted to seconds. 1250 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); 1251 1252 return true; 1253 } 1254 } 1255 1256 bool os::supports_vtime() { return true; } 1257 bool os::enable_vtime() { return false; } 1258 bool os::vtime_enabled() { return false; } 1259 1260 double os::elapsedVTime() { 1261 return (double)gethrvtime() / (double)hrtime_hz; 1262 } 1263 1264 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 1265 jlong os::javaTimeMillis() { 1266 timeval t; 1267 if (gettimeofday(&t, NULL) == -1) { 1268 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno)); 1269 } 1270 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; 1271 } 1272 1273 // Must return seconds+nanos since Jan 1 1970. This must use the same 1274 // time source as javaTimeMillis and can't use get_nsec_fromepoch as 1275 // we need better than 1ms accuracy 1276 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 1277 timeval t; 1278 if (gettimeofday(&t, NULL) == -1) { 1279 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno)); 1280 } 1281 seconds = jlong(t.tv_sec); 1282 nanos = jlong(t.tv_usec) * 1000; 1283 } 1284 1285 1286 jlong os::javaTimeNanos() { 1287 return (jlong)getTimeNanos(); 1288 } 1289 1290 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1291 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits 1292 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1293 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1294 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1295 } 1296 1297 char * os::local_time_string(char *buf, size_t buflen) { 1298 struct tm t; 1299 time_t long_time; 1300 time(&long_time); 1301 localtime_r(&long_time, &t); 1302 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1303 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1304 t.tm_hour, t.tm_min, t.tm_sec); 1305 return buf; 1306 } 1307 1308 // Note: os::shutdown() might be called very early during initialization, or 1309 // called from signal handler. Before adding something to os::shutdown(), make 1310 // sure it is async-safe and can handle partially initialized VM. 1311 void os::shutdown() { 1312 1313 // allow PerfMemory to attempt cleanup of any persistent resources 1314 perfMemory_exit(); 1315 1316 // needs to remove object in file system 1317 AttachListener::abort(); 1318 1319 // flush buffered output, finish log files 1320 ostream_abort(); 1321 1322 // Check for abort hook 1323 abort_hook_t abort_hook = Arguments::abort_hook(); 1324 if (abort_hook != NULL) { 1325 abort_hook(); 1326 } 1327 } 1328 1329 // Note: os::abort() might be called very early during initialization, or 1330 // called from signal handler. Before adding something to os::abort(), make 1331 // sure it is async-safe and can handle partially initialized VM. 1332 void os::abort(bool dump_core, void* siginfo, const void* context) { 1333 os::shutdown(); 1334 if (dump_core) { 1335 #ifndef PRODUCT 1336 fdStream out(defaultStream::output_fd()); 1337 out.print_raw("Current thread is "); 1338 char buf[16]; 1339 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1340 out.print_raw_cr(buf); 1341 out.print_raw_cr("Dumping core ..."); 1342 #endif 1343 ::abort(); // dump core (for debugging) 1344 } 1345 1346 ::exit(1); 1347 } 1348 1349 // Die immediately, no exit hook, no abort hook, no cleanup. 1350 void os::die() { 1351 ::abort(); // dump core (for debugging) 1352 } 1353 1354 // DLL functions 1355 1356 const char* os::dll_file_extension() { return ".so"; } 1357 1358 // This must be hard coded because it's the system's temporary 1359 // directory not the java application's temp directory, ala java.io.tmpdir. 1360 const char* os::get_temp_directory() { return "/tmp"; } 1361 1362 // check if addr is inside libjvm.so 1363 bool os::address_is_in_vm(address addr) { 1364 static address libjvm_base_addr; 1365 Dl_info dlinfo; 1366 1367 if (libjvm_base_addr == NULL) { 1368 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1369 libjvm_base_addr = (address)dlinfo.dli_fbase; 1370 } 1371 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1372 } 1373 1374 if (dladdr((void *)addr, &dlinfo) != 0) { 1375 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1376 } 1377 1378 return false; 1379 } 1380 1381 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int); 1382 static dladdr1_func_type dladdr1_func = NULL; 1383 1384 bool os::dll_address_to_function_name(address addr, char *buf, 1385 int buflen, int * offset, 1386 bool demangle) { 1387 // buf is not optional, but offset is optional 1388 assert(buf != NULL, "sanity check"); 1389 1390 Dl_info dlinfo; 1391 1392 // dladdr1_func was initialized in os::init() 1393 if (dladdr1_func != NULL) { 1394 // yes, we have dladdr1 1395 1396 // Support for dladdr1 is checked at runtime; it may be 1397 // available even if the vm is built on a machine that does 1398 // not have dladdr1 support. Make sure there is a value for 1399 // RTLD_DL_SYMENT. 1400 #ifndef RTLD_DL_SYMENT 1401 #define RTLD_DL_SYMENT 1 1402 #endif 1403 #ifdef _LP64 1404 Elf64_Sym * info; 1405 #else 1406 Elf32_Sym * info; 1407 #endif 1408 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1409 RTLD_DL_SYMENT) != 0) { 1410 // see if we have a matching symbol that covers our address 1411 if (dlinfo.dli_saddr != NULL && 1412 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) { 1413 if (dlinfo.dli_sname != NULL) { 1414 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1415 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1416 } 1417 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1418 return true; 1419 } 1420 } 1421 // no matching symbol so try for just file info 1422 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1423 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1424 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1425 return true; 1426 } 1427 } 1428 } 1429 buf[0] = '\0'; 1430 if (offset != NULL) *offset = -1; 1431 return false; 1432 } 1433 1434 // no, only dladdr is available 1435 if (dladdr((void *)addr, &dlinfo) != 0) { 1436 // see if we have a matching symbol 1437 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1438 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1439 jio_snprintf(buf, buflen, dlinfo.dli_sname); 1440 } 1441 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1442 return true; 1443 } 1444 // no matching symbol so try for just file info 1445 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1446 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1447 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1448 return true; 1449 } 1450 } 1451 } 1452 buf[0] = '\0'; 1453 if (offset != NULL) *offset = -1; 1454 return false; 1455 } 1456 1457 bool os::dll_address_to_library_name(address addr, char* buf, 1458 int buflen, int* offset) { 1459 // buf is not optional, but offset is optional 1460 assert(buf != NULL, "sanity check"); 1461 1462 Dl_info dlinfo; 1463 1464 if (dladdr((void*)addr, &dlinfo) != 0) { 1465 if (dlinfo.dli_fname != NULL) { 1466 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1467 } 1468 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1469 *offset = addr - (address)dlinfo.dli_fbase; 1470 } 1471 return true; 1472 } 1473 1474 buf[0] = '\0'; 1475 if (offset) *offset = -1; 1476 return false; 1477 } 1478 1479 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1480 Dl_info dli; 1481 // Sanity check? 1482 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 || 1483 dli.dli_fname == NULL) { 1484 return 1; 1485 } 1486 1487 void * handle = dlopen(dli.dli_fname, RTLD_LAZY); 1488 if (handle == NULL) { 1489 return 1; 1490 } 1491 1492 Link_map *map; 1493 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1494 if (map == NULL) { 1495 dlclose(handle); 1496 return 1; 1497 } 1498 1499 while (map->l_prev != NULL) { 1500 map = map->l_prev; 1501 } 1502 1503 while (map != NULL) { 1504 // Iterate through all map entries and call callback with fields of interest 1505 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1506 dlclose(handle); 1507 return 1; 1508 } 1509 map = map->l_next; 1510 } 1511 1512 dlclose(handle); 1513 return 0; 1514 } 1515 1516 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1517 outputStream * out = (outputStream *) param; 1518 out->print_cr(PTR_FORMAT " \t%s", base_address, name); 1519 return 0; 1520 } 1521 1522 void os::print_dll_info(outputStream * st) { 1523 st->print_cr("Dynamic libraries:"); st->flush(); 1524 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1525 st->print_cr("Error: Cannot print dynamic libraries."); 1526 } 1527 } 1528 1529 // Loads .dll/.so and 1530 // in case of error it checks if .dll/.so was built for the 1531 // same architecture as Hotspot is running on 1532 1533 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1534 void * result= ::dlopen(filename, RTLD_LAZY); 1535 if (result != NULL) { 1536 // Successful loading 1537 return result; 1538 } 1539 1540 Elf32_Ehdr elf_head; 1541 1542 // Read system error message into ebuf 1543 // It may or may not be overwritten below 1544 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1545 ebuf[ebuflen-1]='\0'; 1546 int diag_msg_max_length=ebuflen-strlen(ebuf); 1547 char* diag_msg_buf=ebuf+strlen(ebuf); 1548 1549 if (diag_msg_max_length==0) { 1550 // No more space in ebuf for additional diagnostics message 1551 return NULL; 1552 } 1553 1554 1555 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1556 1557 if (file_descriptor < 0) { 1558 // Can't open library, report dlerror() message 1559 return NULL; 1560 } 1561 1562 bool failed_to_read_elf_head= 1563 (sizeof(elf_head)!= 1564 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1565 1566 ::close(file_descriptor); 1567 if (failed_to_read_elf_head) { 1568 // file i/o error - report dlerror() msg 1569 return NULL; 1570 } 1571 1572 typedef struct { 1573 Elf32_Half code; // Actual value as defined in elf.h 1574 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1575 char elf_class; // 32 or 64 bit 1576 char endianess; // MSB or LSB 1577 char* name; // String representation 1578 } arch_t; 1579 1580 static const arch_t arch_array[]={ 1581 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1582 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1583 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1584 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1585 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1586 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1587 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1588 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1589 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1590 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"} 1591 }; 1592 1593 #if (defined IA32) 1594 static Elf32_Half running_arch_code=EM_386; 1595 #elif (defined AMD64) 1596 static Elf32_Half running_arch_code=EM_X86_64; 1597 #elif (defined IA64) 1598 static Elf32_Half running_arch_code=EM_IA_64; 1599 #elif (defined __sparc) && (defined _LP64) 1600 static Elf32_Half running_arch_code=EM_SPARCV9; 1601 #elif (defined __sparc) && (!defined _LP64) 1602 static Elf32_Half running_arch_code=EM_SPARC; 1603 #elif (defined __powerpc64__) 1604 static Elf32_Half running_arch_code=EM_PPC64; 1605 #elif (defined __powerpc__) 1606 static Elf32_Half running_arch_code=EM_PPC; 1607 #elif (defined ARM) 1608 static Elf32_Half running_arch_code=EM_ARM; 1609 #else 1610 #error Method os::dll_load requires that one of following is defined:\ 1611 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM 1612 #endif 1613 1614 // Identify compatability class for VM's architecture and library's architecture 1615 // Obtain string descriptions for architectures 1616 1617 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1618 int running_arch_index=-1; 1619 1620 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1621 if (running_arch_code == arch_array[i].code) { 1622 running_arch_index = i; 1623 } 1624 if (lib_arch.code == arch_array[i].code) { 1625 lib_arch.compat_class = arch_array[i].compat_class; 1626 lib_arch.name = arch_array[i].name; 1627 } 1628 } 1629 1630 assert(running_arch_index != -1, 1631 "Didn't find running architecture code (running_arch_code) in arch_array"); 1632 if (running_arch_index == -1) { 1633 // Even though running architecture detection failed 1634 // we may still continue with reporting dlerror() message 1635 return NULL; 1636 } 1637 1638 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1639 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1640 return NULL; 1641 } 1642 1643 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1644 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1645 return NULL; 1646 } 1647 1648 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1649 if (lib_arch.name!=NULL) { 1650 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1651 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1652 lib_arch.name, arch_array[running_arch_index].name); 1653 } else { 1654 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1655 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1656 lib_arch.code, 1657 arch_array[running_arch_index].name); 1658 } 1659 } 1660 1661 return NULL; 1662 } 1663 1664 void* os::dll_lookup(void* handle, const char* name) { 1665 return dlsym(handle, name); 1666 } 1667 1668 void* os::get_default_process_handle() { 1669 return (void*)::dlopen(NULL, RTLD_LAZY); 1670 } 1671 1672 static inline time_t get_mtime(const char* filename) { 1673 struct stat st; 1674 int ret = os::stat(filename, &st); 1675 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 1676 return st.st_mtime; 1677 } 1678 1679 int os::compare_file_modified_times(const char* file1, const char* file2) { 1680 time_t t1 = get_mtime(file1); 1681 time_t t2 = get_mtime(file2); 1682 return t1 - t2; 1683 } 1684 1685 static bool _print_ascii_file(const char* filename, outputStream* st) { 1686 int fd = ::open(filename, O_RDONLY); 1687 if (fd == -1) { 1688 return false; 1689 } 1690 1691 char buf[32]; 1692 int bytes; 1693 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1694 st->print_raw(buf, bytes); 1695 } 1696 1697 ::close(fd); 1698 1699 return true; 1700 } 1701 1702 void os::print_os_info_brief(outputStream* st) { 1703 os::Solaris::print_distro_info(st); 1704 1705 os::Posix::print_uname_info(st); 1706 1707 os::Solaris::print_libversion_info(st); 1708 } 1709 1710 void os::print_os_info(outputStream* st) { 1711 st->print("OS:"); 1712 1713 os::Solaris::print_distro_info(st); 1714 1715 os::Posix::print_uname_info(st); 1716 1717 os::Solaris::print_libversion_info(st); 1718 1719 os::Posix::print_rlimit_info(st); 1720 1721 os::Posix::print_load_average(st); 1722 } 1723 1724 void os::Solaris::print_distro_info(outputStream* st) { 1725 if (!_print_ascii_file("/etc/release", st)) { 1726 st->print("Solaris"); 1727 } 1728 st->cr(); 1729 } 1730 1731 void os::get_summary_os_info(char* buf, size_t buflen) { 1732 strncpy(buf, "Solaris", buflen); // default to plain solaris 1733 FILE* fp = fopen("/etc/release", "r"); 1734 if (fp != NULL) { 1735 char tmp[256]; 1736 // Only get the first line and chop out everything but the os name. 1737 if (fgets(tmp, sizeof(tmp), fp)) { 1738 char* ptr = tmp; 1739 // skip past whitespace characters 1740 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++; 1741 if (*ptr != '\0') { 1742 char* nl = strchr(ptr, '\n'); 1743 if (nl != NULL) *nl = '\0'; 1744 strncpy(buf, ptr, buflen); 1745 } 1746 } 1747 fclose(fp); 1748 } 1749 } 1750 1751 void os::Solaris::print_libversion_info(outputStream* st) { 1752 st->print(" (T2 libthread)"); 1753 st->cr(); 1754 } 1755 1756 static bool check_addr0(outputStream* st) { 1757 jboolean status = false; 1758 const int read_chunk = 200; 1759 int ret = 0; 1760 int nmap = 0; 1761 int fd = ::open("/proc/self/map",O_RDONLY); 1762 if (fd >= 0) { 1763 prmap_t *p = NULL; 1764 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t)); 1765 if (NULL == mbuff) { 1766 ::close(fd); 1767 return status; 1768 } 1769 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) { 1770 //check if read() has not read partial data 1771 if( 0 != ret % sizeof(prmap_t)){ 1772 break; 1773 } 1774 nmap = ret / sizeof(prmap_t); 1775 p = (prmap_t *)mbuff; 1776 for(int i = 0; i < nmap; i++){ 1777 if (p->pr_vaddr == 0x0) { 1778 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024); 1779 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname); 1780 st->print("Access: "); 1781 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-"); 1782 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-"); 1783 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-"); 1784 st->cr(); 1785 status = true; 1786 } 1787 p++; 1788 } 1789 } 1790 free(mbuff); 1791 ::close(fd); 1792 } 1793 return status; 1794 } 1795 1796 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1797 // Get MHz with system call. We don't seem to already have this. 1798 processor_info_t stats; 1799 processorid_t id = getcpuid(); 1800 int clock = 0; 1801 if (processor_info(id, &stats) != -1) { 1802 clock = stats.pi_clock; // pi_processor_type isn't more informative than below 1803 } 1804 #ifdef AMD64 1805 snprintf(buf, buflen, "x86 64 bit %d MHz", clock); 1806 #else 1807 // must be sparc 1808 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock); 1809 #endif 1810 } 1811 1812 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1813 // Nothing to do for now. 1814 } 1815 1816 void os::print_memory_info(outputStream* st) { 1817 st->print("Memory:"); 1818 st->print(" %dk page", os::vm_page_size()>>10); 1819 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 1820 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 1821 st->cr(); 1822 (void) check_addr0(st); 1823 } 1824 1825 // Moved from whole group, because we need them here for diagnostic 1826 // prints. 1827 static int Maxsignum = 0; 1828 static int *ourSigFlags = NULL; 1829 1830 int os::Solaris::get_our_sigflags(int sig) { 1831 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1832 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1833 return ourSigFlags[sig]; 1834 } 1835 1836 void os::Solaris::set_our_sigflags(int sig, int flags) { 1837 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1838 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1839 ourSigFlags[sig] = flags; 1840 } 1841 1842 1843 static const char* get_signal_handler_name(address handler, 1844 char* buf, int buflen) { 1845 int offset; 1846 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 1847 if (found) { 1848 // skip directory names 1849 const char *p1, *p2; 1850 p1 = buf; 1851 size_t len = strlen(os::file_separator()); 1852 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 1853 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 1854 } else { 1855 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 1856 } 1857 return buf; 1858 } 1859 1860 static void print_signal_handler(outputStream* st, int sig, 1861 char* buf, size_t buflen) { 1862 struct sigaction sa; 1863 1864 sigaction(sig, NULL, &sa); 1865 1866 st->print("%s: ", os::exception_name(sig, buf, buflen)); 1867 1868 address handler = (sa.sa_flags & SA_SIGINFO) 1869 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 1870 : CAST_FROM_FN_PTR(address, sa.sa_handler); 1871 1872 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 1873 st->print("SIG_DFL"); 1874 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 1875 st->print("SIG_IGN"); 1876 } else { 1877 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 1878 } 1879 1880 st->print(", sa_mask[0]="); 1881 os::Posix::print_signal_set_short(st, &sa.sa_mask); 1882 1883 address rh = VMError::get_resetted_sighandler(sig); 1884 // May be, handler was resetted by VMError? 1885 if (rh != NULL) { 1886 handler = rh; 1887 sa.sa_flags = VMError::get_resetted_sigflags(sig); 1888 } 1889 1890 st->print(", sa_flags="); 1891 os::Posix::print_sa_flags(st, sa.sa_flags); 1892 1893 // Check: is it our handler? 1894 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) { 1895 // It is our signal handler 1896 // check for flags 1897 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 1898 st->print( 1899 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 1900 os::Solaris::get_our_sigflags(sig)); 1901 } 1902 } 1903 st->cr(); 1904 } 1905 1906 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1907 st->print_cr("Signal Handlers:"); 1908 print_signal_handler(st, SIGSEGV, buf, buflen); 1909 print_signal_handler(st, SIGBUS , buf, buflen); 1910 print_signal_handler(st, SIGFPE , buf, buflen); 1911 print_signal_handler(st, SIGPIPE, buf, buflen); 1912 print_signal_handler(st, SIGXFSZ, buf, buflen); 1913 print_signal_handler(st, SIGILL , buf, buflen); 1914 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 1915 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1916 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 1917 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1918 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 1919 } 1920 1921 static char saved_jvm_path[MAXPATHLEN] = { 0 }; 1922 1923 // Find the full path to the current module, libjvm.so 1924 void os::jvm_path(char *buf, jint buflen) { 1925 // Error checking. 1926 if (buflen < MAXPATHLEN) { 1927 assert(false, "must use a large-enough buffer"); 1928 buf[0] = '\0'; 1929 return; 1930 } 1931 // Lazy resolve the path to current module. 1932 if (saved_jvm_path[0] != 0) { 1933 strcpy(buf, saved_jvm_path); 1934 return; 1935 } 1936 1937 Dl_info dlinfo; 1938 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 1939 assert(ret != 0, "cannot locate libjvm"); 1940 if (ret != 0 && dlinfo.dli_fname != NULL) { 1941 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) { 1942 return; 1943 } 1944 } else { 1945 buf[0] = '\0'; 1946 return; 1947 } 1948 1949 if (Arguments::sun_java_launcher_is_altjvm()) { 1950 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1951 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". 1952 // If "/jre/lib/" appears at the right place in the string, then 1953 // assume we are installed in a JDK and we're done. Otherwise, check 1954 // for a JAVA_HOME environment variable and fix up the path so it 1955 // looks like libjvm.so is installed there (append a fake suffix 1956 // hotspot/libjvm.so). 1957 const char *p = buf + strlen(buf) - 1; 1958 for (int count = 0; p > buf && count < 5; ++count) { 1959 for (--p; p > buf && *p != '/'; --p) 1960 /* empty */ ; 1961 } 1962 1963 if (strncmp(p, "/jre/lib/", 9) != 0) { 1964 // Look for JAVA_HOME in the environment. 1965 char* java_home_var = ::getenv("JAVA_HOME"); 1966 if (java_home_var != NULL && java_home_var[0] != 0) { 1967 char* jrelib_p; 1968 int len; 1969 1970 // Check the current module name "libjvm.so". 1971 p = strrchr(buf, '/'); 1972 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1973 1974 if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) { 1975 return; 1976 } 1977 // determine if this is a legacy image or modules image 1978 // modules image doesn't have "jre" subdirectory 1979 len = strlen(buf); 1980 assert(len < buflen, "Ran out of buffer space"); 1981 jrelib_p = buf + len; 1982 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1983 if (0 != access(buf, F_OK)) { 1984 snprintf(jrelib_p, buflen-len, "/lib"); 1985 } 1986 1987 if (0 == access(buf, F_OK)) { 1988 // Use current module name "libjvm.so" 1989 len = strlen(buf); 1990 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 1991 } else { 1992 // Go back to path of .so 1993 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) { 1994 return; 1995 } 1996 } 1997 } 1998 } 1999 } 2000 2001 strncpy(saved_jvm_path, buf, MAXPATHLEN); 2002 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 2003 } 2004 2005 2006 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2007 // no prefix required, not even "_" 2008 } 2009 2010 2011 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2012 // no suffix required 2013 } 2014 2015 // This method is a copy of JDK's sysGetLastErrorString 2016 // from src/solaris/hpi/src/system_md.c 2017 2018 size_t os::lasterror(char *buf, size_t len) { 2019 if (errno == 0) return 0; 2020 2021 const char *s = os::strerror(errno); 2022 size_t n = ::strlen(s); 2023 if (n >= len) { 2024 n = len - 1; 2025 } 2026 ::strncpy(buf, s, n); 2027 buf[n] = '\0'; 2028 return n; 2029 } 2030 2031 2032 // sun.misc.Signal 2033 2034 extern "C" { 2035 static void UserHandler(int sig, void *siginfo, void *context) { 2036 // Ctrl-C is pressed during error reporting, likely because the error 2037 // handler fails to abort. Let VM die immediately. 2038 if (sig == SIGINT && VMError::is_error_reported()) { 2039 os::die(); 2040 } 2041 2042 os::signal_notify(sig); 2043 // We do not need to reinstate the signal handler each time... 2044 } 2045 } 2046 2047 void* os::user_handler() { 2048 return CAST_FROM_FN_PTR(void*, UserHandler); 2049 } 2050 2051 static struct timespec create_semaphore_timespec(unsigned int sec, int nsec) { 2052 struct timespec ts; 2053 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 2054 2055 return ts; 2056 } 2057 2058 extern "C" { 2059 typedef void (*sa_handler_t)(int); 2060 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2061 } 2062 2063 void* os::signal(int signal_number, void* handler) { 2064 struct sigaction sigAct, oldSigAct; 2065 sigfillset(&(sigAct.sa_mask)); 2066 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 2067 sigAct.sa_flags |= SA_SIGINFO; 2068 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2069 2070 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 2071 // -1 means registration failed 2072 return (void *)-1; 2073 } 2074 2075 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2076 } 2077 2078 void os::signal_raise(int signal_number) { 2079 raise(signal_number); 2080 } 2081 2082 // The following code is moved from os.cpp for making this 2083 // code platform specific, which it is by its very nature. 2084 2085 // a counter for each possible signal value 2086 static int Sigexit = 0; 2087 static jint *pending_signals = NULL; 2088 static int *preinstalled_sigs = NULL; 2089 static struct sigaction *chainedsigactions = NULL; 2090 static Semaphore* sig_sem = NULL; 2091 2092 int os::sigexitnum_pd() { 2093 assert(Sigexit > 0, "signal memory not yet initialized"); 2094 return Sigexit; 2095 } 2096 2097 void os::Solaris::init_signal_mem() { 2098 // Initialize signal structures 2099 Maxsignum = SIGRTMAX; 2100 Sigexit = Maxsignum+1; 2101 assert(Maxsignum >0, "Unable to obtain max signal number"); 2102 2103 // Initialize signal structures 2104 // pending_signals has one int per signal 2105 // The additional signal is for SIGEXIT - exit signal to signal_thread 2106 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); 2107 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 2108 2109 if (UseSignalChaining) { 2110 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 2111 * (Maxsignum + 1), mtInternal); 2112 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 2113 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2114 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 2115 } 2116 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2117 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 2118 } 2119 2120 static void jdk_misc_signal_init() { 2121 // Initialize signal semaphore 2122 sig_sem = new Semaphore(); 2123 } 2124 2125 void os::signal_notify(int sig) { 2126 if (sig_sem != NULL) { 2127 Atomic::inc(&pending_signals[sig]); 2128 sig_sem->signal(); 2129 } else { 2130 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init 2131 // initialization isn't called. 2132 assert(ReduceSignalUsage, "signal semaphore should be created"); 2133 } 2134 } 2135 2136 static int check_pending_signals() { 2137 int ret; 2138 while (true) { 2139 for (int i = 0; i < Sigexit + 1; i++) { 2140 jint n = pending_signals[i]; 2141 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2142 return i; 2143 } 2144 } 2145 JavaThread *thread = JavaThread::current(); 2146 ThreadBlockInVM tbivm(thread); 2147 2148 bool threadIsSuspended; 2149 do { 2150 thread->set_suspend_equivalent(); 2151 sig_sem->wait(); 2152 2153 // were we externally suspended while we were waiting? 2154 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2155 if (threadIsSuspended) { 2156 // The semaphore has been incremented, but while we were waiting 2157 // another thread suspended us. We don't want to continue running 2158 // while suspended because that would surprise the thread that 2159 // suspended us. 2160 sig_sem->signal(); 2161 2162 thread->java_suspend_self(); 2163 } 2164 } while (threadIsSuspended); 2165 } 2166 } 2167 2168 int os::signal_wait() { 2169 return check_pending_signals(); 2170 } 2171 2172 //////////////////////////////////////////////////////////////////////////////// 2173 // Virtual Memory 2174 2175 static int page_size = -1; 2176 2177 int os::vm_page_size() { 2178 assert(page_size != -1, "must call os::init"); 2179 return page_size; 2180 } 2181 2182 // Solaris allocates memory by pages. 2183 int os::vm_allocation_granularity() { 2184 assert(page_size != -1, "must call os::init"); 2185 return page_size; 2186 } 2187 2188 static bool recoverable_mmap_error(int err) { 2189 // See if the error is one we can let the caller handle. This 2190 // list of errno values comes from the Solaris mmap(2) man page. 2191 switch (err) { 2192 case EBADF: 2193 case EINVAL: 2194 case ENOTSUP: 2195 // let the caller deal with these errors 2196 return true; 2197 2198 default: 2199 // Any remaining errors on this OS can cause our reserved mapping 2200 // to be lost. That can cause confusion where different data 2201 // structures think they have the same memory mapped. The worst 2202 // scenario is if both the VM and a library think they have the 2203 // same memory mapped. 2204 return false; 2205 } 2206 } 2207 2208 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec, 2209 int err) { 2210 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2211 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec, 2212 os::strerror(err), err); 2213 } 2214 2215 static void warn_fail_commit_memory(char* addr, size_t bytes, 2216 size_t alignment_hint, bool exec, 2217 int err) { 2218 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2219 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes, 2220 alignment_hint, exec, os::strerror(err), err); 2221 } 2222 2223 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) { 2224 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2225 size_t size = bytes; 2226 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2227 if (res != NULL) { 2228 if (UseNUMAInterleaving) { 2229 numa_make_global(addr, bytes); 2230 } 2231 return 0; 2232 } 2233 2234 int err = errno; // save errno from mmap() call in mmap_chunk() 2235 2236 if (!recoverable_mmap_error(err)) { 2237 warn_fail_commit_memory(addr, bytes, exec, err); 2238 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory."); 2239 } 2240 2241 return err; 2242 } 2243 2244 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 2245 return Solaris::commit_memory_impl(addr, bytes, exec) == 0; 2246 } 2247 2248 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec, 2249 const char* mesg) { 2250 assert(mesg != NULL, "mesg must be specified"); 2251 int err = os::Solaris::commit_memory_impl(addr, bytes, exec); 2252 if (err != 0) { 2253 // the caller wants all commit errors to exit with the specified mesg: 2254 warn_fail_commit_memory(addr, bytes, exec, err); 2255 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2256 } 2257 } 2258 2259 size_t os::Solaris::page_size_for_alignment(size_t alignment) { 2260 assert(is_aligned(alignment, (size_t) vm_page_size()), 2261 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, 2262 alignment, (size_t) vm_page_size()); 2263 2264 for (int i = 0; _page_sizes[i] != 0; i++) { 2265 if (is_aligned(alignment, _page_sizes[i])) { 2266 return _page_sizes[i]; 2267 } 2268 } 2269 2270 return (size_t) vm_page_size(); 2271 } 2272 2273 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, 2274 size_t alignment_hint, bool exec) { 2275 int err = Solaris::commit_memory_impl(addr, bytes, exec); 2276 if (err == 0 && UseLargePages && alignment_hint > 0) { 2277 assert(is_aligned(bytes, alignment_hint), 2278 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint); 2279 2280 // The syscall memcntl requires an exact page size (see man memcntl for details). 2281 size_t page_size = page_size_for_alignment(alignment_hint); 2282 if (page_size > (size_t) vm_page_size()) { 2283 (void)Solaris::setup_large_pages(addr, bytes, page_size); 2284 } 2285 } 2286 return err; 2287 } 2288 2289 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2290 bool exec) { 2291 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0; 2292 } 2293 2294 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, 2295 size_t alignment_hint, bool exec, 2296 const char* mesg) { 2297 assert(mesg != NULL, "mesg must be specified"); 2298 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec); 2299 if (err != 0) { 2300 // the caller wants all commit errors to exit with the specified mesg: 2301 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err); 2302 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2303 } 2304 } 2305 2306 // Uncommit the pages in a specified region. 2307 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { 2308 if (madvise(addr, bytes, MADV_FREE) < 0) { 2309 debug_only(warning("MADV_FREE failed.")); 2310 return; 2311 } 2312 } 2313 2314 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2315 return os::commit_memory(addr, size, !ExecMem); 2316 } 2317 2318 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2319 return os::uncommit_memory(addr, size); 2320 } 2321 2322 // Change the page size in a given range. 2323 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2324 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2325 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2326 if (UseLargePages) { 2327 size_t page_size = Solaris::page_size_for_alignment(alignment_hint); 2328 if (page_size > (size_t) vm_page_size()) { 2329 Solaris::setup_large_pages(addr, bytes, page_size); 2330 } 2331 } 2332 } 2333 2334 // Tell the OS to make the range local to the first-touching LWP 2335 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2336 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2337 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2338 debug_only(warning("MADV_ACCESS_LWP failed.")); 2339 } 2340 } 2341 2342 // Tell the OS that this range would be accessed from different LWPs. 2343 void os::numa_make_global(char *addr, size_t bytes) { 2344 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2345 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2346 debug_only(warning("MADV_ACCESS_MANY failed.")); 2347 } 2348 } 2349 2350 // Get the number of the locality groups. 2351 size_t os::numa_get_groups_num() { 2352 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2353 return n != -1 ? n : 1; 2354 } 2355 2356 // Get a list of leaf locality groups. A leaf lgroup is group that 2357 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2358 // board. An LWP is assigned to one of these groups upon creation. 2359 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2360 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2361 ids[0] = 0; 2362 return 1; 2363 } 2364 int result_size = 0, top = 1, bottom = 0, cur = 0; 2365 for (int k = 0; k < size; k++) { 2366 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2367 (Solaris::lgrp_id_t*)&ids[top], size - top); 2368 if (r == -1) { 2369 ids[0] = 0; 2370 return 1; 2371 } 2372 if (!r) { 2373 // That's a leaf node. 2374 assert(bottom <= cur, "Sanity check"); 2375 // Check if the node has memory 2376 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2377 NULL, 0, LGRP_RSRC_MEM) > 0) { 2378 ids[bottom++] = ids[cur]; 2379 } 2380 } 2381 top += r; 2382 cur++; 2383 } 2384 if (bottom == 0) { 2385 // Handle a situation, when the OS reports no memory available. 2386 // Assume UMA architecture. 2387 ids[0] = 0; 2388 return 1; 2389 } 2390 return bottom; 2391 } 2392 2393 // Detect the topology change. Typically happens during CPU plugging-unplugging. 2394 bool os::numa_topology_changed() { 2395 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2396 if (is_stale != -1 && is_stale) { 2397 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2398 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2399 assert(c != 0, "Failure to initialize LGRP API"); 2400 Solaris::set_lgrp_cookie(c); 2401 return true; 2402 } 2403 return false; 2404 } 2405 2406 // Get the group id of the current LWP. 2407 int os::numa_get_group_id() { 2408 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2409 if (lgrp_id == -1) { 2410 return 0; 2411 } 2412 const int size = os::numa_get_groups_num(); 2413 int *ids = (int*)alloca(size * sizeof(int)); 2414 2415 // Get the ids of all lgroups with memory; r is the count. 2416 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2417 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2418 if (r <= 0) { 2419 return 0; 2420 } 2421 return ids[os::random() % r]; 2422 } 2423 2424 // Request information about the page. 2425 bool os::get_page_info(char *start, page_info* info) { 2426 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2427 uint64_t addr = (uintptr_t)start; 2428 uint64_t outdata[2]; 2429 uint_t validity = 0; 2430 2431 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2432 return false; 2433 } 2434 2435 info->size = 0; 2436 info->lgrp_id = -1; 2437 2438 if ((validity & 1) != 0) { 2439 if ((validity & 2) != 0) { 2440 info->lgrp_id = outdata[0]; 2441 } 2442 if ((validity & 4) != 0) { 2443 info->size = outdata[1]; 2444 } 2445 return true; 2446 } 2447 return false; 2448 } 2449 2450 // Scan the pages from start to end until a page different than 2451 // the one described in the info parameter is encountered. 2452 char *os::scan_pages(char *start, char* end, page_info* page_expected, 2453 page_info* page_found) { 2454 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2455 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2456 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1]; 2457 uint_t validity[MAX_MEMINFO_CNT]; 2458 2459 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2460 uint64_t p = (uint64_t)start; 2461 while (p < (uint64_t)end) { 2462 addrs[0] = p; 2463 size_t addrs_count = 1; 2464 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { 2465 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2466 addrs_count++; 2467 } 2468 2469 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2470 return NULL; 2471 } 2472 2473 size_t i = 0; 2474 for (; i < addrs_count; i++) { 2475 if ((validity[i] & 1) != 0) { 2476 if ((validity[i] & 4) != 0) { 2477 if (outdata[types * i + 1] != page_expected->size) { 2478 break; 2479 } 2480 } else if (page_expected->size != 0) { 2481 break; 2482 } 2483 2484 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2485 if (outdata[types * i] != page_expected->lgrp_id) { 2486 break; 2487 } 2488 } 2489 } else { 2490 return NULL; 2491 } 2492 } 2493 2494 if (i < addrs_count) { 2495 if ((validity[i] & 2) != 0) { 2496 page_found->lgrp_id = outdata[types * i]; 2497 } else { 2498 page_found->lgrp_id = -1; 2499 } 2500 if ((validity[i] & 4) != 0) { 2501 page_found->size = outdata[types * i + 1]; 2502 } else { 2503 page_found->size = 0; 2504 } 2505 return (char*)addrs[i]; 2506 } 2507 2508 p = addrs[addrs_count - 1] + page_size; 2509 } 2510 return end; 2511 } 2512 2513 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 2514 size_t size = bytes; 2515 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2516 // uncommitted page. Otherwise, the read/write might succeed if we 2517 // have enough swap space to back the physical page. 2518 return 2519 NULL != Solaris::mmap_chunk(addr, size, 2520 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2521 PROT_NONE); 2522 } 2523 2524 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2525 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2526 2527 if (b == MAP_FAILED) { 2528 return NULL; 2529 } 2530 return b; 2531 } 2532 2533 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, 2534 size_t alignment_hint, bool fixed) { 2535 char* addr = requested_addr; 2536 int flags = MAP_PRIVATE | MAP_NORESERVE; 2537 2538 assert(!(fixed && (alignment_hint > 0)), 2539 "alignment hint meaningless with fixed mmap"); 2540 2541 if (fixed) { 2542 flags |= MAP_FIXED; 2543 } else if (alignment_hint > (size_t) vm_page_size()) { 2544 flags |= MAP_ALIGN; 2545 addr = (char*) alignment_hint; 2546 } 2547 2548 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2549 // uncommitted page. Otherwise, the read/write might succeed if we 2550 // have enough swap space to back the physical page. 2551 return mmap_chunk(addr, bytes, flags, PROT_NONE); 2552 } 2553 2554 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2555 size_t alignment_hint) { 2556 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, 2557 (requested_addr != NULL)); 2558 2559 guarantee(requested_addr == NULL || requested_addr == addr, 2560 "OS failed to return requested mmap address."); 2561 return addr; 2562 } 2563 2564 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) { 2565 assert(file_desc >= 0, "file_desc is not valid"); 2566 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr); 2567 if (result != NULL) { 2568 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) { 2569 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory")); 2570 } 2571 } 2572 return result; 2573 } 2574 2575 // Reserve memory at an arbitrary address, only if that area is 2576 // available (and not reserved for something else). 2577 2578 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2579 const int max_tries = 10; 2580 char* base[max_tries]; 2581 size_t size[max_tries]; 2582 2583 // Solaris adds a gap between mmap'ed regions. The size of the gap 2584 // is dependent on the requested size and the MMU. Our initial gap 2585 // value here is just a guess and will be corrected later. 2586 bool had_top_overlap = false; 2587 bool have_adjusted_gap = false; 2588 size_t gap = 0x400000; 2589 2590 // Assert only that the size is a multiple of the page size, since 2591 // that's all that mmap requires, and since that's all we really know 2592 // about at this low abstraction level. If we need higher alignment, 2593 // we can either pass an alignment to this method or verify alignment 2594 // in one of the methods further up the call chain. See bug 5044738. 2595 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2596 2597 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 2598 // Give it a try, if the kernel honors the hint we can return immediately. 2599 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 2600 2601 volatile int err = errno; 2602 if (addr == requested_addr) { 2603 return addr; 2604 } else if (addr != NULL) { 2605 pd_unmap_memory(addr, bytes); 2606 } 2607 2608 if (log_is_enabled(Warning, os)) { 2609 char buf[256]; 2610 buf[0] = '\0'; 2611 if (addr == NULL) { 2612 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err)); 2613 } 2614 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at " 2615 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT 2616 "%s", bytes, requested_addr, addr, buf); 2617 } 2618 2619 // Address hint method didn't work. Fall back to the old method. 2620 // In theory, once SNV becomes our oldest supported platform, this 2621 // code will no longer be needed. 2622 // 2623 // Repeatedly allocate blocks until the block is allocated at the 2624 // right spot. Give up after max_tries. 2625 int i; 2626 for (i = 0; i < max_tries; ++i) { 2627 base[i] = reserve_memory(bytes); 2628 2629 if (base[i] != NULL) { 2630 // Is this the block we wanted? 2631 if (base[i] == requested_addr) { 2632 size[i] = bytes; 2633 break; 2634 } 2635 2636 // check that the gap value is right 2637 if (had_top_overlap && !have_adjusted_gap) { 2638 size_t actual_gap = base[i-1] - base[i] - bytes; 2639 if (gap != actual_gap) { 2640 // adjust the gap value and retry the last 2 allocations 2641 assert(i > 0, "gap adjustment code problem"); 2642 have_adjusted_gap = true; // adjust the gap only once, just in case 2643 gap = actual_gap; 2644 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap); 2645 unmap_memory(base[i], bytes); 2646 unmap_memory(base[i-1], size[i-1]); 2647 i-=2; 2648 continue; 2649 } 2650 } 2651 2652 // Does this overlap the block we wanted? Give back the overlapped 2653 // parts and try again. 2654 // 2655 // There is still a bug in this code: if top_overlap == bytes, 2656 // the overlap is offset from requested region by the value of gap. 2657 // In this case giving back the overlapped part will not work, 2658 // because we'll give back the entire block at base[i] and 2659 // therefore the subsequent allocation will not generate a new gap. 2660 // This could be fixed with a new algorithm that used larger 2661 // or variable size chunks to find the requested region - 2662 // but such a change would introduce additional complications. 2663 // It's rare enough that the planets align for this bug, 2664 // so we'll just wait for a fix for 6204603/5003415 which 2665 // will provide a mmap flag to allow us to avoid this business. 2666 2667 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2668 if (top_overlap >= 0 && top_overlap < bytes) { 2669 had_top_overlap = true; 2670 unmap_memory(base[i], top_overlap); 2671 base[i] += top_overlap; 2672 size[i] = bytes - top_overlap; 2673 } else { 2674 size_t bottom_overlap = base[i] + bytes - requested_addr; 2675 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2676 if (bottom_overlap == 0) { 2677 log_info(os)("attempt_reserve_memory_at: possible alignment bug"); 2678 } 2679 unmap_memory(requested_addr, bottom_overlap); 2680 size[i] = bytes - bottom_overlap; 2681 } else { 2682 size[i] = bytes; 2683 } 2684 } 2685 } 2686 } 2687 2688 // Give back the unused reserved pieces. 2689 2690 for (int j = 0; j < i; ++j) { 2691 if (base[j] != NULL) { 2692 unmap_memory(base[j], size[j]); 2693 } 2694 } 2695 2696 return (i < max_tries) ? requested_addr : NULL; 2697 } 2698 2699 bool os::pd_release_memory(char* addr, size_t bytes) { 2700 size_t size = bytes; 2701 return munmap(addr, size) == 0; 2702 } 2703 2704 static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 2705 assert(addr == (char*)align_down((uintptr_t)addr, os::vm_page_size()), 2706 "addr must be page aligned"); 2707 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+bytes), prot); 2708 int retVal = mprotect(addr, bytes, prot); 2709 return retVal == 0; 2710 } 2711 2712 // Protect memory (Used to pass readonly pages through 2713 // JNI GetArray<type>Elements with empty arrays.) 2714 // Also, used for serialization page and for compressed oops null pointer 2715 // checking. 2716 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2717 bool is_committed) { 2718 unsigned int p = 0; 2719 switch (prot) { 2720 case MEM_PROT_NONE: p = PROT_NONE; break; 2721 case MEM_PROT_READ: p = PROT_READ; break; 2722 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2723 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2724 default: 2725 ShouldNotReachHere(); 2726 } 2727 // is_committed is unused. 2728 return solaris_mprotect(addr, bytes, p); 2729 } 2730 2731 // guard_memory and unguard_memory only happens within stack guard pages. 2732 // Since ISM pertains only to the heap, guard and unguard memory should not 2733 /// happen with an ISM region. 2734 bool os::guard_memory(char* addr, size_t bytes) { 2735 return solaris_mprotect(addr, bytes, PROT_NONE); 2736 } 2737 2738 bool os::unguard_memory(char* addr, size_t bytes) { 2739 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 2740 } 2741 2742 // Large page support 2743 static size_t _large_page_size = 0; 2744 2745 // Insertion sort for small arrays (descending order). 2746 static void insertion_sort_descending(size_t* array, int len) { 2747 for (int i = 0; i < len; i++) { 2748 size_t val = array[i]; 2749 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 2750 size_t tmp = array[key]; 2751 array[key] = array[key - 1]; 2752 array[key - 1] = tmp; 2753 } 2754 } 2755 } 2756 2757 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) { 2758 const unsigned int usable_count = VM_Version::page_size_count(); 2759 if (usable_count == 1) { 2760 return false; 2761 } 2762 2763 // Find the right getpagesizes interface. When solaris 11 is the minimum 2764 // build platform, getpagesizes() (without the '2') can be called directly. 2765 typedef int (*gps_t)(size_t[], int); 2766 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); 2767 if (gps_func == NULL) { 2768 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); 2769 if (gps_func == NULL) { 2770 if (warn) { 2771 warning("MPSS is not supported by the operating system."); 2772 } 2773 return false; 2774 } 2775 } 2776 2777 // Fill the array of page sizes. 2778 int n = (*gps_func)(_page_sizes, page_sizes_max); 2779 assert(n > 0, "Solaris bug?"); 2780 2781 if (n == page_sizes_max) { 2782 // Add a sentinel value (necessary only if the array was completely filled 2783 // since it is static (zeroed at initialization)). 2784 _page_sizes[--n] = 0; 2785 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 2786 } 2787 assert(_page_sizes[n] == 0, "missing sentinel"); 2788 trace_page_sizes("available page sizes", _page_sizes, n); 2789 2790 if (n == 1) return false; // Only one page size available. 2791 2792 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 2793 // select up to usable_count elements. First sort the array, find the first 2794 // acceptable value, then copy the usable sizes to the top of the array and 2795 // trim the rest. Make sure to include the default page size :-). 2796 // 2797 // A better policy could get rid of the 4M limit by taking the sizes of the 2798 // important VM memory regions (java heap and possibly the code cache) into 2799 // account. 2800 insertion_sort_descending(_page_sizes, n); 2801 const size_t size_limit = 2802 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 2803 int beg; 2804 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */; 2805 const int end = MIN2((int)usable_count, n) - 1; 2806 for (int cur = 0; cur < end; ++cur, ++beg) { 2807 _page_sizes[cur] = _page_sizes[beg]; 2808 } 2809 _page_sizes[end] = vm_page_size(); 2810 _page_sizes[end + 1] = 0; 2811 2812 if (_page_sizes[end] > _page_sizes[end - 1]) { 2813 // Default page size is not the smallest; sort again. 2814 insertion_sort_descending(_page_sizes, end + 1); 2815 } 2816 *page_size = _page_sizes[0]; 2817 2818 trace_page_sizes("usable page sizes", _page_sizes, end + 1); 2819 return true; 2820 } 2821 2822 void os::large_page_init() { 2823 if (UseLargePages) { 2824 // print a warning if any large page related flag is specified on command line 2825 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2826 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2827 2828 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 2829 } 2830 } 2831 2832 bool os::Solaris::is_valid_page_size(size_t bytes) { 2833 for (int i = 0; _page_sizes[i] != 0; i++) { 2834 if (_page_sizes[i] == bytes) { 2835 return true; 2836 } 2837 } 2838 return false; 2839 } 2840 2841 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) { 2842 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align); 2843 assert(is_aligned((void*) start, align), 2844 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align); 2845 assert(is_aligned(bytes, align), 2846 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align); 2847 2848 // Signal to OS that we want large pages for addresses 2849 // from addr, addr + bytes 2850 struct memcntl_mha mpss_struct; 2851 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 2852 mpss_struct.mha_pagesize = align; 2853 mpss_struct.mha_flags = 0; 2854 // Upon successful completion, memcntl() returns 0 2855 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) { 2856 debug_only(warning("Attempt to use MPSS failed.")); 2857 return false; 2858 } 2859 return true; 2860 } 2861 2862 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) { 2863 fatal("os::reserve_memory_special should not be called on Solaris."); 2864 return NULL; 2865 } 2866 2867 bool os::release_memory_special(char* base, size_t bytes) { 2868 fatal("os::release_memory_special should not be called on Solaris."); 2869 return false; 2870 } 2871 2872 size_t os::large_page_size() { 2873 return _large_page_size; 2874 } 2875 2876 // MPSS allows application to commit large page memory on demand; with ISM 2877 // the entire memory region must be allocated as shared memory. 2878 bool os::can_commit_large_page_memory() { 2879 return true; 2880 } 2881 2882 bool os::can_execute_large_page_memory() { 2883 return true; 2884 } 2885 2886 // Read calls from inside the vm need to perform state transitions 2887 size_t os::read(int fd, void *buf, unsigned int nBytes) { 2888 size_t res; 2889 JavaThread* thread = (JavaThread*)Thread::current(); 2890 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 2891 ThreadBlockInVM tbiv(thread); 2892 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 2893 return res; 2894 } 2895 2896 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 2897 size_t res; 2898 JavaThread* thread = (JavaThread*)Thread::current(); 2899 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 2900 ThreadBlockInVM tbiv(thread); 2901 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res); 2902 return res; 2903 } 2904 2905 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) { 2906 size_t res; 2907 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 2908 "Assumed _thread_in_native"); 2909 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 2910 return res; 2911 } 2912 2913 void os::naked_short_sleep(jlong ms) { 2914 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 2915 2916 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but 2917 // Solaris requires -lrt for this. 2918 usleep((ms * 1000)); 2919 2920 return; 2921 } 2922 2923 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2924 void os::infinite_sleep() { 2925 while (true) { // sleep forever ... 2926 ::sleep(100); // ... 100 seconds at a time 2927 } 2928 } 2929 2930 // Used to convert frequent JVM_Yield() to nops 2931 bool os::dont_yield() { 2932 if (DontYieldALot) { 2933 static hrtime_t last_time = 0; 2934 hrtime_t diff = getTimeNanos() - last_time; 2935 2936 if (diff < DontYieldALotInterval * 1000000) { 2937 return true; 2938 } 2939 2940 last_time += diff; 2941 2942 return false; 2943 } else { 2944 return false; 2945 } 2946 } 2947 2948 // Note that yield semantics are defined by the scheduling class to which 2949 // the thread currently belongs. Typically, yield will _not yield to 2950 // other equal or higher priority threads that reside on the dispatch queues 2951 // of other CPUs. 2952 2953 void os::naked_yield() { 2954 thr_yield(); 2955 } 2956 2957 // Interface for setting lwp priorities. We are using T2 libthread, 2958 // which forces the use of bound threads, so all of our threads will 2959 // be assigned to real lwp's. Using the thr_setprio function is 2960 // meaningless in this mode so we must adjust the real lwp's priority. 2961 // The routines below implement the getting and setting of lwp priorities. 2962 // 2963 // Note: There are three priority scales used on Solaris. Java priotities 2964 // which range from 1 to 10, libthread "thr_setprio" scale which range 2965 // from 0 to 127, and the current scheduling class of the process we 2966 // are running in. This is typically from -60 to +60. 2967 // The setting of the lwp priorities in done after a call to thr_setprio 2968 // so Java priorities are mapped to libthread priorities and we map from 2969 // the latter to lwp priorities. We don't keep priorities stored in 2970 // Java priorities since some of our worker threads want to set priorities 2971 // higher than all Java threads. 2972 // 2973 // For related information: 2974 // (1) man -s 2 priocntl 2975 // (2) man -s 4 priocntl 2976 // (3) man dispadmin 2977 // = librt.so 2978 // = libthread/common/rtsched.c - thrp_setlwpprio(). 2979 // = ps -cL <pid> ... to validate priority. 2980 // = sched_get_priority_min and _max 2981 // pthread_create 2982 // sched_setparam 2983 // pthread_setschedparam 2984 // 2985 // Assumptions: 2986 // + We assume that all threads in the process belong to the same 2987 // scheduling class. IE. an homogenous process. 2988 // + Must be root or in IA group to change change "interactive" attribute. 2989 // Priocntl() will fail silently. The only indication of failure is when 2990 // we read-back the value and notice that it hasn't changed. 2991 // + Interactive threads enter the runq at the head, non-interactive at the tail. 2992 // + For RT, change timeslice as well. Invariant: 2993 // constant "priority integral" 2994 // Konst == TimeSlice * (60-Priority) 2995 // Given a priority, compute appropriate timeslice. 2996 // + Higher numerical values have higher priority. 2997 2998 // sched class attributes 2999 typedef struct { 3000 int schedPolicy; // classID 3001 int maxPrio; 3002 int minPrio; 3003 } SchedInfo; 3004 3005 3006 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; 3007 3008 #ifdef ASSERT 3009 static int ReadBackValidate = 1; 3010 #endif 3011 static int myClass = 0; 3012 static int myMin = 0; 3013 static int myMax = 0; 3014 static int myCur = 0; 3015 static bool priocntl_enable = false; 3016 3017 static const int criticalPrio = FXCriticalPriority; 3018 static int java_MaxPriority_to_os_priority = 0; // Saved mapping 3019 3020 3021 // lwp_priocntl_init 3022 // 3023 // Try to determine the priority scale for our process. 3024 // 3025 // Return errno or 0 if OK. 3026 // 3027 static int lwp_priocntl_init() { 3028 int rslt; 3029 pcinfo_t ClassInfo; 3030 pcparms_t ParmInfo; 3031 int i; 3032 3033 if (!UseThreadPriorities) return 0; 3034 3035 // If ThreadPriorityPolicy is 1, switch tables 3036 if (ThreadPriorityPolicy == 1) { 3037 for (i = 0; i < CriticalPriority+1; i++) 3038 os::java_to_os_priority[i] = prio_policy1[i]; 3039 } 3040 if (UseCriticalJavaThreadPriority) { 3041 // MaxPriority always maps to the FX scheduling class and criticalPrio. 3042 // See set_native_priority() and set_lwp_class_and_priority(). 3043 // Save original MaxPriority mapping in case attempt to 3044 // use critical priority fails. 3045 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; 3046 // Set negative to distinguish from other priorities 3047 os::java_to_os_priority[MaxPriority] = -criticalPrio; 3048 } 3049 3050 // Get IDs for a set of well-known scheduling classes. 3051 // TODO-FIXME: GETCLINFO returns the current # of classes in the 3052 // the system. We should have a loop that iterates over the 3053 // classID values, which are known to be "small" integers. 3054 3055 strcpy(ClassInfo.pc_clname, "TS"); 3056 ClassInfo.pc_cid = -1; 3057 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3058 if (rslt < 0) return errno; 3059 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 3060 tsLimits.schedPolicy = ClassInfo.pc_cid; 3061 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 3062 tsLimits.minPrio = -tsLimits.maxPrio; 3063 3064 strcpy(ClassInfo.pc_clname, "IA"); 3065 ClassInfo.pc_cid = -1; 3066 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3067 if (rslt < 0) return errno; 3068 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 3069 iaLimits.schedPolicy = ClassInfo.pc_cid; 3070 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 3071 iaLimits.minPrio = -iaLimits.maxPrio; 3072 3073 strcpy(ClassInfo.pc_clname, "RT"); 3074 ClassInfo.pc_cid = -1; 3075 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3076 if (rslt < 0) return errno; 3077 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 3078 rtLimits.schedPolicy = ClassInfo.pc_cid; 3079 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 3080 rtLimits.minPrio = 0; 3081 3082 strcpy(ClassInfo.pc_clname, "FX"); 3083 ClassInfo.pc_cid = -1; 3084 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3085 if (rslt < 0) return errno; 3086 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); 3087 fxLimits.schedPolicy = ClassInfo.pc_cid; 3088 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; 3089 fxLimits.minPrio = 0; 3090 3091 // Query our "current" scheduling class. 3092 // This will normally be IA, TS or, rarely, FX or RT. 3093 memset(&ParmInfo, 0, sizeof(ParmInfo)); 3094 ParmInfo.pc_cid = PC_CLNULL; 3095 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3096 if (rslt < 0) return errno; 3097 myClass = ParmInfo.pc_cid; 3098 3099 // We now know our scheduling classId, get specific information 3100 // about the class. 3101 ClassInfo.pc_cid = myClass; 3102 ClassInfo.pc_clname[0] = 0; 3103 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); 3104 if (rslt < 0) return errno; 3105 3106 if (ThreadPriorityVerbose) { 3107 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 3108 } 3109 3110 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3111 ParmInfo.pc_cid = PC_CLNULL; 3112 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3113 if (rslt < 0) return errno; 3114 3115 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3116 myMin = rtLimits.minPrio; 3117 myMax = rtLimits.maxPrio; 3118 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3119 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3120 myMin = iaLimits.minPrio; 3121 myMax = iaLimits.maxPrio; 3122 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 3123 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3124 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3125 myMin = tsLimits.minPrio; 3126 myMax = tsLimits.maxPrio; 3127 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 3128 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3129 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3130 myMin = fxLimits.minPrio; 3131 myMax = fxLimits.maxPrio; 3132 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict 3133 } else { 3134 // No clue - punt 3135 if (ThreadPriorityVerbose) { 3136 tty->print_cr("Unknown scheduling class: %s ... \n", 3137 ClassInfo.pc_clname); 3138 } 3139 return EINVAL; // no clue, punt 3140 } 3141 3142 if (ThreadPriorityVerbose) { 3143 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax); 3144 } 3145 3146 priocntl_enable = true; // Enable changing priorities 3147 return 0; 3148 } 3149 3150 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 3151 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 3152 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 3153 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) 3154 3155 3156 // scale_to_lwp_priority 3157 // 3158 // Convert from the libthread "thr_setprio" scale to our current 3159 // lwp scheduling class scale. 3160 // 3161 static int scale_to_lwp_priority(int rMin, int rMax, int x) { 3162 int v; 3163 3164 if (x == 127) return rMax; // avoid round-down 3165 v = (((x*(rMax-rMin)))/128)+rMin; 3166 return v; 3167 } 3168 3169 3170 // set_lwp_class_and_priority 3171 int set_lwp_class_and_priority(int ThreadID, int lwpid, 3172 int newPrio, int new_class, bool scale) { 3173 int rslt; 3174 int Actual, Expected, prv; 3175 pcparms_t ParmInfo; // for GET-SET 3176 #ifdef ASSERT 3177 pcparms_t ReadBack; // for readback 3178 #endif 3179 3180 // Set priority via PC_GETPARMS, update, PC_SETPARMS 3181 // Query current values. 3182 // TODO: accelerate this by eliminating the PC_GETPARMS call. 3183 // Cache "pcparms_t" in global ParmCache. 3184 // TODO: elide set-to-same-value 3185 3186 // If something went wrong on init, don't change priorities. 3187 if (!priocntl_enable) { 3188 if (ThreadPriorityVerbose) { 3189 tty->print_cr("Trying to set priority but init failed, ignoring"); 3190 } 3191 return EINVAL; 3192 } 3193 3194 // If lwp hasn't started yet, just return 3195 // the _start routine will call us again. 3196 if (lwpid <= 0) { 3197 if (ThreadPriorityVerbose) { 3198 tty->print_cr("deferring the set_lwp_class_and_priority of thread " 3199 INTPTR_FORMAT " to %d, lwpid not set", 3200 ThreadID, newPrio); 3201 } 3202 return 0; 3203 } 3204 3205 if (ThreadPriorityVerbose) { 3206 tty->print_cr ("set_lwp_class_and_priority(" 3207 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 3208 ThreadID, lwpid, newPrio); 3209 } 3210 3211 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3212 ParmInfo.pc_cid = PC_CLNULL; 3213 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 3214 if (rslt < 0) return errno; 3215 3216 int cur_class = ParmInfo.pc_cid; 3217 ParmInfo.pc_cid = (id_t)new_class; 3218 3219 if (new_class == rtLimits.schedPolicy) { 3220 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 3221 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, 3222 rtLimits.maxPrio, newPrio) 3223 : newPrio; 3224 rtInfo->rt_tqsecs = RT_NOCHANGE; 3225 rtInfo->rt_tqnsecs = RT_NOCHANGE; 3226 if (ThreadPriorityVerbose) { 3227 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 3228 } 3229 } else if (new_class == iaLimits.schedPolicy) { 3230 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3231 int maxClamped = MIN2(iaLimits.maxPrio, 3232 cur_class == new_class 3233 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); 3234 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, 3235 maxClamped, newPrio) 3236 : newPrio; 3237 iaInfo->ia_uprilim = cur_class == new_class 3238 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; 3239 iaInfo->ia_mode = IA_NOCHANGE; 3240 if (ThreadPriorityVerbose) { 3241 tty->print_cr("IA: [%d...%d] %d->%d\n", 3242 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 3243 } 3244 } else if (new_class == tsLimits.schedPolicy) { 3245 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3246 int maxClamped = MIN2(tsLimits.maxPrio, 3247 cur_class == new_class 3248 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); 3249 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, 3250 maxClamped, newPrio) 3251 : newPrio; 3252 tsInfo->ts_uprilim = cur_class == new_class 3253 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; 3254 if (ThreadPriorityVerbose) { 3255 tty->print_cr("TS: [%d...%d] %d->%d\n", 3256 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 3257 } 3258 } else if (new_class == fxLimits.schedPolicy) { 3259 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3260 int maxClamped = MIN2(fxLimits.maxPrio, 3261 cur_class == new_class 3262 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); 3263 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, 3264 maxClamped, newPrio) 3265 : newPrio; 3266 fxInfo->fx_uprilim = cur_class == new_class 3267 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; 3268 fxInfo->fx_tqsecs = FX_NOCHANGE; 3269 fxInfo->fx_tqnsecs = FX_NOCHANGE; 3270 if (ThreadPriorityVerbose) { 3271 tty->print_cr("FX: [%d...%d] %d->%d\n", 3272 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); 3273 } 3274 } else { 3275 if (ThreadPriorityVerbose) { 3276 tty->print_cr("Unknown new scheduling class %d\n", new_class); 3277 } 3278 return EINVAL; // no clue, punt 3279 } 3280 3281 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 3282 if (ThreadPriorityVerbose && rslt) { 3283 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 3284 } 3285 if (rslt < 0) return errno; 3286 3287 #ifdef ASSERT 3288 // Sanity check: read back what we just attempted to set. 3289 // In theory it could have changed in the interim ... 3290 // 3291 // The priocntl system call is tricky. 3292 // Sometimes it'll validate the priority value argument and 3293 // return EINVAL if unhappy. At other times it fails silently. 3294 // Readbacks are prudent. 3295 3296 if (!ReadBackValidate) return 0; 3297 3298 memset(&ReadBack, 0, sizeof(pcparms_t)); 3299 ReadBack.pc_cid = PC_CLNULL; 3300 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 3301 assert(rslt >= 0, "priocntl failed"); 3302 Actual = Expected = 0xBAD; 3303 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3304 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3305 Actual = RTPRI(ReadBack)->rt_pri; 3306 Expected = RTPRI(ParmInfo)->rt_pri; 3307 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3308 Actual = IAPRI(ReadBack)->ia_upri; 3309 Expected = IAPRI(ParmInfo)->ia_upri; 3310 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3311 Actual = TSPRI(ReadBack)->ts_upri; 3312 Expected = TSPRI(ParmInfo)->ts_upri; 3313 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3314 Actual = FXPRI(ReadBack)->fx_upri; 3315 Expected = FXPRI(ParmInfo)->fx_upri; 3316 } else { 3317 if (ThreadPriorityVerbose) { 3318 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", 3319 ParmInfo.pc_cid); 3320 } 3321 } 3322 3323 if (Actual != Expected) { 3324 if (ThreadPriorityVerbose) { 3325 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 3326 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 3327 } 3328 } 3329 #endif 3330 3331 return 0; 3332 } 3333 3334 // Solaris only gives access to 128 real priorities at a time, 3335 // so we expand Java's ten to fill this range. This would be better 3336 // if we dynamically adjusted relative priorities. 3337 // 3338 // The ThreadPriorityPolicy option allows us to select 2 different 3339 // priority scales. 3340 // 3341 // ThreadPriorityPolicy=0 3342 // Since the Solaris' default priority is MaximumPriority, we do not 3343 // set a priority lower than Max unless a priority lower than 3344 // NormPriority is requested. 3345 // 3346 // ThreadPriorityPolicy=1 3347 // This mode causes the priority table to get filled with 3348 // linear values. NormPriority get's mapped to 50% of the 3349 // Maximum priority an so on. This will cause VM threads 3350 // to get unfair treatment against other Solaris processes 3351 // which do not explicitly alter their thread priorities. 3352 3353 int os::java_to_os_priority[CriticalPriority + 1] = { 3354 -99999, // 0 Entry should never be used 3355 3356 0, // 1 MinPriority 3357 32, // 2 3358 64, // 3 3359 3360 96, // 4 3361 127, // 5 NormPriority 3362 127, // 6 3363 3364 127, // 7 3365 127, // 8 3366 127, // 9 NearMaxPriority 3367 3368 127, // 10 MaxPriority 3369 3370 -criticalPrio // 11 CriticalPriority 3371 }; 3372 3373 OSReturn os::set_native_priority(Thread* thread, int newpri) { 3374 OSThread* osthread = thread->osthread(); 3375 3376 // Save requested priority in case the thread hasn't been started 3377 osthread->set_native_priority(newpri); 3378 3379 // Check for critical priority request 3380 bool fxcritical = false; 3381 if (newpri == -criticalPrio) { 3382 fxcritical = true; 3383 newpri = criticalPrio; 3384 } 3385 3386 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 3387 if (!UseThreadPriorities) return OS_OK; 3388 3389 int status = 0; 3390 3391 if (!fxcritical) { 3392 // Use thr_setprio only if we have a priority that thr_setprio understands 3393 status = thr_setprio(thread->osthread()->thread_id(), newpri); 3394 } 3395 3396 int lwp_status = 3397 set_lwp_class_and_priority(osthread->thread_id(), 3398 osthread->lwp_id(), 3399 newpri, 3400 fxcritical ? fxLimits.schedPolicy : myClass, 3401 !fxcritical); 3402 if (lwp_status != 0 && fxcritical) { 3403 // Try again, this time without changing the scheduling class 3404 newpri = java_MaxPriority_to_os_priority; 3405 lwp_status = set_lwp_class_and_priority(osthread->thread_id(), 3406 osthread->lwp_id(), 3407 newpri, myClass, false); 3408 } 3409 status |= lwp_status; 3410 return (status == 0) ? OS_OK : OS_ERR; 3411 } 3412 3413 3414 OSReturn os::get_native_priority(const Thread* const thread, 3415 int *priority_ptr) { 3416 int p; 3417 if (!UseThreadPriorities) { 3418 *priority_ptr = NormalPriority; 3419 return OS_OK; 3420 } 3421 int status = thr_getprio(thread->osthread()->thread_id(), &p); 3422 if (status != 0) { 3423 return OS_ERR; 3424 } 3425 *priority_ptr = p; 3426 return OS_OK; 3427 } 3428 3429 3430 // Hint to the underlying OS that a task switch would not be good. 3431 // Void return because it's a hint and can fail. 3432 void os::hint_no_preempt() { 3433 schedctl_start(schedctl_init()); 3434 } 3435 3436 //////////////////////////////////////////////////////////////////////////////// 3437 // suspend/resume support 3438 3439 // The low-level signal-based suspend/resume support is a remnant from the 3440 // old VM-suspension that used to be for java-suspension, safepoints etc, 3441 // within hotspot. Currently used by JFR's OSThreadSampler 3442 // 3443 // The remaining code is greatly simplified from the more general suspension 3444 // code that used to be used. 3445 // 3446 // The protocol is quite simple: 3447 // - suspend: 3448 // - sends a signal to the target thread 3449 // - polls the suspend state of the osthread using a yield loop 3450 // - target thread signal handler (SR_handler) sets suspend state 3451 // and blocks in sigsuspend until continued 3452 // - resume: 3453 // - sets target osthread state to continue 3454 // - sends signal to end the sigsuspend loop in the SR_handler 3455 // 3456 // Note that the SR_lock plays no role in this suspend/resume protocol, 3457 // but is checked for NULL in SR_handler as a thread termination indicator. 3458 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. 3459 // 3460 // Note that resume_clear_context() and suspend_save_context() are needed 3461 // by SR_handler(), so that fetch_frame_from_ucontext() works, 3462 // which in part is used by: 3463 // - Forte Analyzer: AsyncGetCallTrace() 3464 // - StackBanging: get_frame_at_stack_banging_point() 3465 // - JFR: get_topframe()-->....-->get_valid_uc_in_signal_handler() 3466 3467 static void resume_clear_context(OSThread *osthread) { 3468 osthread->set_ucontext(NULL); 3469 } 3470 3471 static void suspend_save_context(OSThread *osthread, ucontext_t* context) { 3472 osthread->set_ucontext(context); 3473 } 3474 3475 static PosixSemaphore sr_semaphore; 3476 3477 void os::Solaris::SR_handler(Thread* thread, ucontext_t* context) { 3478 // Save and restore errno to avoid confusing native code with EINTR 3479 // after sigsuspend. 3480 int old_errno = errno; 3481 3482 OSThread* osthread = thread->osthread(); 3483 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 3484 3485 os::SuspendResume::State current = osthread->sr.state(); 3486 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 3487 suspend_save_context(osthread, context); 3488 3489 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 3490 os::SuspendResume::State state = osthread->sr.suspended(); 3491 if (state == os::SuspendResume::SR_SUSPENDED) { 3492 sigset_t suspend_set; // signals for sigsuspend() 3493 3494 // get current set of blocked signals and unblock resume signal 3495 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 3496 sigdelset(&suspend_set, ASYNC_SIGNAL); 3497 3498 sr_semaphore.signal(); 3499 // wait here until we are resumed 3500 while (1) { 3501 sigsuspend(&suspend_set); 3502 3503 os::SuspendResume::State result = osthread->sr.running(); 3504 if (result == os::SuspendResume::SR_RUNNING) { 3505 sr_semaphore.signal(); 3506 break; 3507 } 3508 } 3509 3510 } else if (state == os::SuspendResume::SR_RUNNING) { 3511 // request was cancelled, continue 3512 } else { 3513 ShouldNotReachHere(); 3514 } 3515 3516 resume_clear_context(osthread); 3517 } else if (current == os::SuspendResume::SR_RUNNING) { 3518 // request was cancelled, continue 3519 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 3520 // ignore 3521 } else { 3522 // ignore 3523 } 3524 3525 errno = old_errno; 3526 } 3527 3528 void os::print_statistics() { 3529 } 3530 3531 bool os::message_box(const char* title, const char* message) { 3532 int i; 3533 fdStream err(defaultStream::error_fd()); 3534 for (i = 0; i < 78; i++) err.print_raw("="); 3535 err.cr(); 3536 err.print_raw_cr(title); 3537 for (i = 0; i < 78; i++) err.print_raw("-"); 3538 err.cr(); 3539 err.print_raw_cr(message); 3540 for (i = 0; i < 78; i++) err.print_raw("="); 3541 err.cr(); 3542 3543 char buf[16]; 3544 // Prevent process from exiting upon "read error" without consuming all CPU 3545 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3546 3547 return buf[0] == 'y' || buf[0] == 'Y'; 3548 } 3549 3550 static int sr_notify(OSThread* osthread) { 3551 int status = thr_kill(osthread->thread_id(), ASYNC_SIGNAL); 3552 assert_status(status == 0, status, "thr_kill"); 3553 return status; 3554 } 3555 3556 // "Randomly" selected value for how long we want to spin 3557 // before bailing out on suspending a thread, also how often 3558 // we send a signal to a thread we want to resume 3559 static const int RANDOMLY_LARGE_INTEGER = 1000000; 3560 static const int RANDOMLY_LARGE_INTEGER2 = 100; 3561 3562 static bool do_suspend(OSThread* osthread) { 3563 assert(osthread->sr.is_running(), "thread should be running"); 3564 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 3565 3566 // mark as suspended and send signal 3567 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 3568 // failed to switch, state wasn't running? 3569 ShouldNotReachHere(); 3570 return false; 3571 } 3572 3573 if (sr_notify(osthread) != 0) { 3574 ShouldNotReachHere(); 3575 } 3576 3577 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 3578 while (true) { 3579 if (sr_semaphore.timedwait(create_semaphore_timespec(0, 2000 * NANOSECS_PER_MILLISEC))) { 3580 break; 3581 } else { 3582 // timeout 3583 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 3584 if (cancelled == os::SuspendResume::SR_RUNNING) { 3585 return false; 3586 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 3587 // make sure that we consume the signal on the semaphore as well 3588 sr_semaphore.wait(); 3589 break; 3590 } else { 3591 ShouldNotReachHere(); 3592 return false; 3593 } 3594 } 3595 } 3596 3597 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 3598 return true; 3599 } 3600 3601 static void do_resume(OSThread* osthread) { 3602 assert(osthread->sr.is_suspended(), "thread should be suspended"); 3603 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 3604 3605 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 3606 // failed to switch to WAKEUP_REQUEST 3607 ShouldNotReachHere(); 3608 return; 3609 } 3610 3611 while (true) { 3612 if (sr_notify(osthread) == 0) { 3613 if (sr_semaphore.timedwait(create_semaphore_timespec(0, 2 * NANOSECS_PER_MILLISEC))) { 3614 if (osthread->sr.is_running()) { 3615 return; 3616 } 3617 } 3618 } else { 3619 ShouldNotReachHere(); 3620 } 3621 } 3622 3623 guarantee(osthread->sr.is_running(), "Must be running!"); 3624 } 3625 3626 void os::SuspendedThreadTask::internal_do_task() { 3627 if (do_suspend(_thread->osthread())) { 3628 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3629 do_task(context); 3630 do_resume(_thread->osthread()); 3631 } 3632 } 3633 3634 // This does not do anything on Solaris. This is basically a hook for being 3635 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 3636 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3637 const methodHandle& method, JavaCallArguments* args, 3638 Thread* thread) { 3639 f(value, method, args, thread); 3640 } 3641 3642 // This routine may be used by user applications as a "hook" to catch signals. 3643 // The user-defined signal handler must pass unrecognized signals to this 3644 // routine, and if it returns true (non-zero), then the signal handler must 3645 // return immediately. If the flag "abort_if_unrecognized" is true, then this 3646 // routine will never retun false (zero), but instead will execute a VM panic 3647 // routine kill the process. 3648 // 3649 // If this routine returns false, it is OK to call it again. This allows 3650 // the user-defined signal handler to perform checks either before or after 3651 // the VM performs its own checks. Naturally, the user code would be making 3652 // a serious error if it tried to handle an exception (such as a null check 3653 // or breakpoint) that the VM was generating for its own correct operation. 3654 // 3655 // This routine may recognize any of the following kinds of signals: 3656 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 3657 // ASYNC_SIGNAL. 3658 // It should be consulted by handlers for any of those signals. 3659 // 3660 // The caller of this routine must pass in the three arguments supplied 3661 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 3662 // field of the structure passed to sigaction(). This routine assumes that 3663 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3664 // 3665 // Note that the VM will print warnings if it detects conflicting signal 3666 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3667 // 3668 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo, 3669 siginfo_t* siginfo, 3670 void* ucontext, 3671 int abort_if_unrecognized); 3672 3673 3674 void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 3675 int orig_errno = errno; // Preserve errno value over signal handler. 3676 JVM_handle_solaris_signal(sig, info, ucVoid, true); 3677 errno = orig_errno; 3678 } 3679 3680 // This boolean allows users to forward their own non-matching signals 3681 // to JVM_handle_solaris_signal, harmlessly. 3682 bool os::Solaris::signal_handlers_are_installed = false; 3683 3684 // For signal-chaining 3685 bool os::Solaris::libjsig_is_loaded = false; 3686 typedef struct sigaction *(*get_signal_t)(int); 3687 get_signal_t os::Solaris::get_signal_action = NULL; 3688 3689 struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 3690 struct sigaction *actp = NULL; 3691 3692 if ((libjsig_is_loaded) && (sig <= Maxsignum)) { 3693 // Retrieve the old signal handler from libjsig 3694 actp = (*get_signal_action)(sig); 3695 } 3696 if (actp == NULL) { 3697 // Retrieve the preinstalled signal handler from jvm 3698 actp = get_preinstalled_handler(sig); 3699 } 3700 3701 return actp; 3702 } 3703 3704 static bool call_chained_handler(struct sigaction *actp, int sig, 3705 siginfo_t *siginfo, void *context) { 3706 // Call the old signal handler 3707 if (actp->sa_handler == SIG_DFL) { 3708 // It's more reasonable to let jvm treat it as an unexpected exception 3709 // instead of taking the default action. 3710 return false; 3711 } else if (actp->sa_handler != SIG_IGN) { 3712 if ((actp->sa_flags & SA_NODEFER) == 0) { 3713 // automaticlly block the signal 3714 sigaddset(&(actp->sa_mask), sig); 3715 } 3716 3717 sa_handler_t hand; 3718 sa_sigaction_t sa; 3719 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3720 // retrieve the chained handler 3721 if (siginfo_flag_set) { 3722 sa = actp->sa_sigaction; 3723 } else { 3724 hand = actp->sa_handler; 3725 } 3726 3727 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3728 actp->sa_handler = SIG_DFL; 3729 } 3730 3731 // try to honor the signal mask 3732 sigset_t oset; 3733 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3734 3735 // call into the chained handler 3736 if (siginfo_flag_set) { 3737 (*sa)(sig, siginfo, context); 3738 } else { 3739 (*hand)(sig); 3740 } 3741 3742 // restore the signal mask 3743 pthread_sigmask(SIG_SETMASK, &oset, 0); 3744 } 3745 // Tell jvm's signal handler the signal is taken care of. 3746 return true; 3747 } 3748 3749 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3750 bool chained = false; 3751 // signal-chaining 3752 if (UseSignalChaining) { 3753 struct sigaction *actp = get_chained_signal_action(sig); 3754 if (actp != NULL) { 3755 chained = call_chained_handler(actp, sig, siginfo, context); 3756 } 3757 } 3758 return chained; 3759 } 3760 3761 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 3762 assert((chainedsigactions != (struct sigaction *)NULL) && 3763 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3764 if (preinstalled_sigs[sig] != 0) { 3765 return &chainedsigactions[sig]; 3766 } 3767 return NULL; 3768 } 3769 3770 void os::Solaris::save_preinstalled_handler(int sig, 3771 struct sigaction& oldAct) { 3772 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 3773 assert((chainedsigactions != (struct sigaction *)NULL) && 3774 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3775 chainedsigactions[sig] = oldAct; 3776 preinstalled_sigs[sig] = 1; 3777 } 3778 3779 void os::Solaris::set_signal_handler(int sig, bool set_installed, 3780 bool oktochain) { 3781 // Check for overwrite. 3782 struct sigaction oldAct; 3783 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3784 void* oldhand = 3785 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3786 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3787 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3788 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3789 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 3790 if (AllowUserSignalHandlers || !set_installed) { 3791 // Do not overwrite; user takes responsibility to forward to us. 3792 return; 3793 } else if (UseSignalChaining) { 3794 if (oktochain) { 3795 // save the old handler in jvm 3796 save_preinstalled_handler(sig, oldAct); 3797 } else { 3798 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal."); 3799 } 3800 // libjsig also interposes the sigaction() call below and saves the 3801 // old sigaction on it own. 3802 } else { 3803 fatal("Encountered unexpected pre-existing sigaction handler " 3804 "%#lx for signal %d.", (long)oldhand, sig); 3805 } 3806 } 3807 3808 struct sigaction sigAct; 3809 sigfillset(&(sigAct.sa_mask)); 3810 sigAct.sa_handler = SIG_DFL; 3811 3812 sigAct.sa_sigaction = signalHandler; 3813 // Handle SIGSEGV on alternate signal stack if 3814 // not using stack banging 3815 if (!UseStackBanging && sig == SIGSEGV) { 3816 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 3817 } else { 3818 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 3819 } 3820 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 3821 3822 sigaction(sig, &sigAct, &oldAct); 3823 3824 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3825 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3826 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3827 } 3828 3829 3830 #define DO_SIGNAL_CHECK(sig) \ 3831 do { \ 3832 if (!sigismember(&check_signal_done, sig)) { \ 3833 os::Solaris::check_signal_handler(sig); \ 3834 } \ 3835 } while (0) 3836 3837 // This method is a periodic task to check for misbehaving JNI applications 3838 // under CheckJNI, we can add any periodic checks here 3839 3840 void os::run_periodic_checks() { 3841 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 3842 // thereby preventing a NULL checks. 3843 if (!check_addr0_done) check_addr0_done = check_addr0(tty); 3844 3845 if (check_signals == false) return; 3846 3847 // SEGV and BUS if overridden could potentially prevent 3848 // generation of hs*.log in the event of a crash, debugging 3849 // such a case can be very challenging, so we absolutely 3850 // check for the following for a good measure: 3851 DO_SIGNAL_CHECK(SIGSEGV); 3852 DO_SIGNAL_CHECK(SIGILL); 3853 DO_SIGNAL_CHECK(SIGFPE); 3854 DO_SIGNAL_CHECK(SIGBUS); 3855 DO_SIGNAL_CHECK(SIGPIPE); 3856 DO_SIGNAL_CHECK(SIGXFSZ); 3857 DO_SIGNAL_CHECK(ASYNC_SIGNAL); 3858 3859 // ReduceSignalUsage allows the user to override these handlers 3860 // see comments at the very top and jvm_solaris.h 3861 if (!ReduceSignalUsage) { 3862 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3863 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3864 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3865 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3866 } 3867 } 3868 3869 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3870 3871 static os_sigaction_t os_sigaction = NULL; 3872 3873 void os::Solaris::check_signal_handler(int sig) { 3874 char buf[O_BUFLEN]; 3875 address jvmHandler = NULL; 3876 3877 struct sigaction act; 3878 if (os_sigaction == NULL) { 3879 // only trust the default sigaction, in case it has been interposed 3880 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3881 if (os_sigaction == NULL) return; 3882 } 3883 3884 os_sigaction(sig, (struct sigaction*)NULL, &act); 3885 3886 address thisHandler = (act.sa_flags & SA_SIGINFO) 3887 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3888 : CAST_FROM_FN_PTR(address, act.sa_handler); 3889 3890 3891 switch (sig) { 3892 case SIGSEGV: 3893 case SIGBUS: 3894 case SIGFPE: 3895 case SIGPIPE: 3896 case SIGXFSZ: 3897 case SIGILL: 3898 case ASYNC_SIGNAL: 3899 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 3900 break; 3901 3902 case SHUTDOWN1_SIGNAL: 3903 case SHUTDOWN2_SIGNAL: 3904 case SHUTDOWN3_SIGNAL: 3905 case BREAK_SIGNAL: 3906 jvmHandler = (address)user_handler(); 3907 break; 3908 3909 default: 3910 return; 3911 } 3912 3913 if (thisHandler != jvmHandler) { 3914 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3915 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3916 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3917 // No need to check this sig any longer 3918 sigaddset(&check_signal_done, sig); 3919 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3920 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3921 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3922 exception_name(sig, buf, O_BUFLEN)); 3923 } 3924 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 3925 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3926 tty->print("expected:"); 3927 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig)); 3928 tty->cr(); 3929 tty->print(" found:"); 3930 os::Posix::print_sa_flags(tty, act.sa_flags); 3931 tty->cr(); 3932 // No need to check this sig any longer 3933 sigaddset(&check_signal_done, sig); 3934 } 3935 3936 // Print all the signal handler state 3937 if (sigismember(&check_signal_done, sig)) { 3938 print_signal_handlers(tty, buf, O_BUFLEN); 3939 } 3940 3941 } 3942 3943 void os::Solaris::install_signal_handlers() { 3944 signal_handlers_are_installed = true; 3945 3946 // signal-chaining 3947 typedef void (*signal_setting_t)(); 3948 signal_setting_t begin_signal_setting = NULL; 3949 signal_setting_t end_signal_setting = NULL; 3950 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3951 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3952 if (begin_signal_setting != NULL) { 3953 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3954 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3955 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3956 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3957 libjsig_is_loaded = true; 3958 assert(UseSignalChaining, "should enable signal-chaining"); 3959 } 3960 if (libjsig_is_loaded) { 3961 // Tell libjsig jvm is setting signal handlers 3962 (*begin_signal_setting)(); 3963 } 3964 3965 set_signal_handler(SIGSEGV, true, true); 3966 set_signal_handler(SIGPIPE, true, true); 3967 set_signal_handler(SIGXFSZ, true, true); 3968 set_signal_handler(SIGBUS, true, true); 3969 set_signal_handler(SIGILL, true, true); 3970 set_signal_handler(SIGFPE, true, true); 3971 set_signal_handler(ASYNC_SIGNAL, true, true); 3972 3973 if (libjsig_is_loaded) { 3974 // Tell libjsig jvm finishes setting signal handlers 3975 (*end_signal_setting)(); 3976 } 3977 3978 // We don't activate signal checker if libjsig is in place, we trust ourselves 3979 // and if UserSignalHandler is installed all bets are off. 3980 // Log that signal checking is off only if -verbose:jni is specified. 3981 if (CheckJNICalls) { 3982 if (libjsig_is_loaded) { 3983 if (PrintJNIResolving) { 3984 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3985 } 3986 check_signals = false; 3987 } 3988 if (AllowUserSignalHandlers) { 3989 if (PrintJNIResolving) { 3990 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3991 } 3992 check_signals = false; 3993 } 3994 } 3995 } 3996 3997 3998 void report_error(const char* file_name, int line_no, const char* title, 3999 const char* format, ...); 4000 4001 // (Static) wrappers for the liblgrp API 4002 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 4003 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 4004 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 4005 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 4006 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 4007 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 4008 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 4009 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 4010 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 4011 4012 static address resolve_symbol_lazy(const char* name) { 4013 address addr = (address) dlsym(RTLD_DEFAULT, name); 4014 if (addr == NULL) { 4015 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 4016 addr = (address) dlsym(RTLD_NEXT, name); 4017 } 4018 return addr; 4019 } 4020 4021 static address resolve_symbol(const char* name) { 4022 address addr = resolve_symbol_lazy(name); 4023 if (addr == NULL) { 4024 fatal(dlerror()); 4025 } 4026 return addr; 4027 } 4028 4029 void os::Solaris::libthread_init() { 4030 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 4031 4032 lwp_priocntl_init(); 4033 4034 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 4035 if (func == NULL) { 4036 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 4037 // Guarantee that this VM is running on an new enough OS (5.6 or 4038 // later) that it will have a new enough libthread.so. 4039 guarantee(func != NULL, "libthread.so is too old."); 4040 } 4041 4042 int size; 4043 void (*handler_info_func)(address *, int *); 4044 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 4045 handler_info_func(&handler_start, &size); 4046 handler_end = handler_start + size; 4047 } 4048 4049 4050 int_fnP_mutex_tP os::Solaris::_mutex_lock; 4051 int_fnP_mutex_tP os::Solaris::_mutex_trylock; 4052 int_fnP_mutex_tP os::Solaris::_mutex_unlock; 4053 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 4054 int_fnP_mutex_tP os::Solaris::_mutex_destroy; 4055 int os::Solaris::_mutex_scope = USYNC_THREAD; 4056 4057 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 4058 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 4059 int_fnP_cond_tP os::Solaris::_cond_signal; 4060 int_fnP_cond_tP os::Solaris::_cond_broadcast; 4061 int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 4062 int_fnP_cond_tP os::Solaris::_cond_destroy; 4063 int os::Solaris::_cond_scope = USYNC_THREAD; 4064 bool os::Solaris::_synchronization_initialized; 4065 4066 void os::Solaris::synchronization_init() { 4067 if (UseLWPSynchronization) { 4068 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 4069 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 4070 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 4071 os::Solaris::set_mutex_init(lwp_mutex_init); 4072 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 4073 os::Solaris::set_mutex_scope(USYNC_THREAD); 4074 4075 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 4076 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 4077 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 4078 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 4079 os::Solaris::set_cond_init(lwp_cond_init); 4080 os::Solaris::set_cond_destroy(lwp_cond_destroy); 4081 os::Solaris::set_cond_scope(USYNC_THREAD); 4082 } else { 4083 os::Solaris::set_mutex_scope(USYNC_THREAD); 4084 os::Solaris::set_cond_scope(USYNC_THREAD); 4085 4086 if (UsePthreads) { 4087 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 4088 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 4089 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 4090 os::Solaris::set_mutex_init(pthread_mutex_default_init); 4091 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 4092 4093 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 4094 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 4095 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 4096 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 4097 os::Solaris::set_cond_init(pthread_cond_default_init); 4098 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 4099 } else { 4100 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 4101 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 4102 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 4103 os::Solaris::set_mutex_init(::mutex_init); 4104 os::Solaris::set_mutex_destroy(::mutex_destroy); 4105 4106 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 4107 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 4108 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 4109 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 4110 os::Solaris::set_cond_init(::cond_init); 4111 os::Solaris::set_cond_destroy(::cond_destroy); 4112 } 4113 } 4114 _synchronization_initialized = true; 4115 } 4116 4117 bool os::Solaris::liblgrp_init() { 4118 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 4119 if (handle != NULL) { 4120 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 4121 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 4122 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 4123 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 4124 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 4125 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 4126 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 4127 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 4128 dlsym(handle, "lgrp_cookie_stale"))); 4129 4130 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 4131 set_lgrp_cookie(c); 4132 return true; 4133 } 4134 return false; 4135 } 4136 4137 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 4138 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 4139 static pset_getloadavg_type pset_getloadavg_ptr = NULL; 4140 4141 void init_pset_getloadavg_ptr(void) { 4142 pset_getloadavg_ptr = 4143 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 4144 if (pset_getloadavg_ptr == NULL) { 4145 log_warning(os)("pset_getloadavg function not found"); 4146 } 4147 } 4148 4149 int os::Solaris::_dev_zero_fd = -1; 4150 4151 // this is called _before_ the global arguments have been parsed 4152 void os::init(void) { 4153 _initial_pid = getpid(); 4154 4155 max_hrtime = first_hrtime = gethrtime(); 4156 4157 init_random(1234567); 4158 4159 page_size = sysconf(_SC_PAGESIZE); 4160 if (page_size == -1) { 4161 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 4162 } 4163 init_page_sizes((size_t) page_size); 4164 4165 Solaris::initialize_system_info(); 4166 4167 int fd = ::open("/dev/zero", O_RDWR); 4168 if (fd < 0) { 4169 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno)); 4170 } else { 4171 Solaris::set_dev_zero_fd(fd); 4172 4173 // Close on exec, child won't inherit. 4174 fcntl(fd, F_SETFD, FD_CLOEXEC); 4175 } 4176 4177 clock_tics_per_sec = CLK_TCK; 4178 4179 // check if dladdr1() exists; dladdr1 can provide more information than 4180 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 4181 // and is available on linker patches for 5.7 and 5.8. 4182 // libdl.so must have been loaded, this call is just an entry lookup 4183 void * hdl = dlopen("libdl.so", RTLD_NOW); 4184 if (hdl) { 4185 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 4186 } 4187 4188 // main_thread points to the thread that created/loaded the JVM. 4189 main_thread = thr_self(); 4190 4191 // dynamic lookup of functions that may not be available in our lowest 4192 // supported Solaris release 4193 void * handle = dlopen("libc.so.1", RTLD_LAZY); 4194 if (handle != NULL) { 4195 Solaris::_pthread_setname_np = // from 11.3 4196 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np"); 4197 } 4198 } 4199 4200 // To install functions for atexit system call 4201 extern "C" { 4202 static void perfMemory_exit_helper() { 4203 perfMemory_exit(); 4204 } 4205 } 4206 4207 // this is called _after_ the global arguments have been parsed 4208 jint os::init_2(void) { 4209 // try to enable extended file IO ASAP, see 6431278 4210 os::Solaris::try_enable_extended_io(); 4211 4212 // Check and sets minimum stack sizes against command line options 4213 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 4214 return JNI_ERR; 4215 } 4216 4217 Solaris::libthread_init(); 4218 4219 if (UseNUMA) { 4220 if (!Solaris::liblgrp_init()) { 4221 UseNUMA = false; 4222 } else { 4223 size_t lgrp_limit = os::numa_get_groups_num(); 4224 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); 4225 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 4226 FREE_C_HEAP_ARRAY(int, lgrp_ids); 4227 if (lgrp_num < 2) { 4228 // There's only one locality group, disable NUMA. 4229 UseNUMA = false; 4230 } 4231 } 4232 if (!UseNUMA && ForceNUMA) { 4233 UseNUMA = true; 4234 } 4235 } 4236 4237 Solaris::signal_sets_init(); 4238 Solaris::init_signal_mem(); 4239 Solaris::install_signal_handlers(); 4240 // Initialize data for jdk.internal.misc.Signal 4241 if (!ReduceSignalUsage) { 4242 jdk_misc_signal_init(); 4243 } 4244 4245 // initialize synchronization primitives to use either thread or 4246 // lwp synchronization (controlled by UseLWPSynchronization) 4247 Solaris::synchronization_init(); 4248 4249 if (MaxFDLimit) { 4250 // set the number of file descriptors to max. print out error 4251 // if getrlimit/setrlimit fails but continue regardless. 4252 struct rlimit nbr_files; 4253 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 4254 if (status != 0) { 4255 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 4256 } else { 4257 nbr_files.rlim_cur = nbr_files.rlim_max; 4258 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 4259 if (status != 0) { 4260 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 4261 } 4262 } 4263 } 4264 4265 // Calculate theoretical max. size of Threads to guard gainst 4266 // artifical out-of-memory situations, where all available address- 4267 // space has been reserved by thread stacks. Default stack size is 1Mb. 4268 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 4269 JavaThread::stack_size_at_create() : (1*K*K); 4270 assert(pre_thread_stack_size != 0, "Must have a stack"); 4271 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 4272 // we should start doing Virtual Memory banging. Currently when the threads will 4273 // have used all but 200Mb of space. 4274 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 4275 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 4276 4277 // at-exit methods are called in the reverse order of their registration. 4278 // In Solaris 7 and earlier, atexit functions are called on return from 4279 // main or as a result of a call to exit(3C). There can be only 32 of 4280 // these functions registered and atexit() does not set errno. In Solaris 4281 // 8 and later, there is no limit to the number of functions registered 4282 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 4283 // functions are called upon dlclose(3DL) in addition to return from main 4284 // and exit(3C). 4285 4286 if (PerfAllowAtExitRegistration) { 4287 // only register atexit functions if PerfAllowAtExitRegistration is set. 4288 // atexit functions can be delayed until process exit time, which 4289 // can be problematic for embedded VM situations. Embedded VMs should 4290 // call DestroyJavaVM() to assure that VM resources are released. 4291 4292 // note: perfMemory_exit_helper atexit function may be removed in 4293 // the future if the appropriate cleanup code can be added to the 4294 // VM_Exit VMOperation's doit method. 4295 if (atexit(perfMemory_exit_helper) != 0) { 4296 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 4297 } 4298 } 4299 4300 // Init pset_loadavg function pointer 4301 init_pset_getloadavg_ptr(); 4302 4303 return JNI_OK; 4304 } 4305 4306 // Mark the polling page as unreadable 4307 void os::make_polling_page_unreadable(void) { 4308 Events::log(NULL, "Protecting polling page " INTPTR_FORMAT " with PROT_NONE", p2i(_polling_page)); 4309 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) { 4310 fatal("Could not disable polling page"); 4311 } 4312 } 4313 4314 // Mark the polling page as readable 4315 void os::make_polling_page_readable(void) { 4316 Events::log(NULL, "Protecting polling page " INTPTR_FORMAT " with PROT_READ", p2i(_polling_page)); 4317 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) { 4318 fatal("Could not enable polling page"); 4319 } 4320 } 4321 4322 // Is a (classpath) directory empty? 4323 bool os::dir_is_empty(const char* path) { 4324 DIR *dir = NULL; 4325 struct dirent *ptr; 4326 4327 dir = opendir(path); 4328 if (dir == NULL) return true; 4329 4330 // Scan the directory 4331 bool result = true; 4332 while (result && (ptr = readdir(dir)) != NULL) { 4333 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 4334 result = false; 4335 } 4336 } 4337 closedir(dir); 4338 return result; 4339 } 4340 4341 // This code originates from JDK's sysOpen and open64_w 4342 // from src/solaris/hpi/src/system_md.c 4343 4344 int os::open(const char *path, int oflag, int mode) { 4345 if (strlen(path) > MAX_PATH - 1) { 4346 errno = ENAMETOOLONG; 4347 return -1; 4348 } 4349 int fd; 4350 4351 fd = ::open64(path, oflag, mode); 4352 if (fd == -1) return -1; 4353 4354 // If the open succeeded, the file might still be a directory 4355 { 4356 struct stat64 buf64; 4357 int ret = ::fstat64(fd, &buf64); 4358 int st_mode = buf64.st_mode; 4359 4360 if (ret != -1) { 4361 if ((st_mode & S_IFMT) == S_IFDIR) { 4362 errno = EISDIR; 4363 ::close(fd); 4364 return -1; 4365 } 4366 } else { 4367 ::close(fd); 4368 return -1; 4369 } 4370 } 4371 4372 // 32-bit Solaris systems suffer from: 4373 // 4374 // - an historical default soft limit of 256 per-process file 4375 // descriptors that is too low for many Java programs. 4376 // 4377 // - a design flaw where file descriptors created using stdio 4378 // fopen must be less than 256, _even_ when the first limit above 4379 // has been raised. This can cause calls to fopen (but not calls to 4380 // open, for example) to fail mysteriously, perhaps in 3rd party 4381 // native code (although the JDK itself uses fopen). One can hardly 4382 // criticize them for using this most standard of all functions. 4383 // 4384 // We attempt to make everything work anyways by: 4385 // 4386 // - raising the soft limit on per-process file descriptors beyond 4387 // 256 4388 // 4389 // - As of Solaris 10u4, we can request that Solaris raise the 256 4390 // stdio fopen limit by calling function enable_extended_FILE_stdio. 4391 // This is done in init_2 and recorded in enabled_extended_FILE_stdio 4392 // 4393 // - If we are stuck on an old (pre 10u4) Solaris system, we can 4394 // workaround the bug by remapping non-stdio file descriptors below 4395 // 256 to ones beyond 256, which is done below. 4396 // 4397 // See: 4398 // 1085341: 32-bit stdio routines should support file descriptors >255 4399 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files 4400 // 6431278: Netbeans crash on 32 bit Solaris: need to call 4401 // enable_extended_FILE_stdio() in VM initialisation 4402 // Giri Mandalika's blog 4403 // http://technopark02.blogspot.com/2005_05_01_archive.html 4404 // 4405 #ifndef _LP64 4406 if ((!enabled_extended_FILE_stdio) && fd < 256) { 4407 int newfd = ::fcntl(fd, F_DUPFD, 256); 4408 if (newfd != -1) { 4409 ::close(fd); 4410 fd = newfd; 4411 } 4412 } 4413 #endif // 32-bit Solaris 4414 4415 // All file descriptors that are opened in the JVM and not 4416 // specifically destined for a subprocess should have the 4417 // close-on-exec flag set. If we don't set it, then careless 3rd 4418 // party native code might fork and exec without closing all 4419 // appropriate file descriptors (e.g. as we do in closeDescriptors in 4420 // UNIXProcess.c), and this in turn might: 4421 // 4422 // - cause end-of-file to fail to be detected on some file 4423 // descriptors, resulting in mysterious hangs, or 4424 // 4425 // - might cause an fopen in the subprocess to fail on a system 4426 // suffering from bug 1085341. 4427 // 4428 // (Yes, the default setting of the close-on-exec flag is a Unix 4429 // design flaw) 4430 // 4431 // See: 4432 // 1085341: 32-bit stdio routines should support file descriptors >255 4433 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 4434 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 4435 // 4436 #ifdef FD_CLOEXEC 4437 { 4438 int flags = ::fcntl(fd, F_GETFD); 4439 if (flags != -1) { 4440 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 4441 } 4442 } 4443 #endif 4444 4445 return fd; 4446 } 4447 4448 // create binary file, rewriting existing file if required 4449 int os::create_binary_file(const char* path, bool rewrite_existing) { 4450 int oflags = O_WRONLY | O_CREAT; 4451 if (!rewrite_existing) { 4452 oflags |= O_EXCL; 4453 } 4454 return ::open64(path, oflags, S_IREAD | S_IWRITE); 4455 } 4456 4457 // return current position of file pointer 4458 jlong os::current_file_offset(int fd) { 4459 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 4460 } 4461 4462 // move file pointer to the specified offset 4463 jlong os::seek_to_file_offset(int fd, jlong offset) { 4464 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 4465 } 4466 4467 jlong os::lseek(int fd, jlong offset, int whence) { 4468 return (jlong) ::lseek64(fd, offset, whence); 4469 } 4470 4471 int os::ftruncate(int fd, jlong length) { 4472 return ::ftruncate64(fd, length); 4473 } 4474 4475 int os::fsync(int fd) { 4476 RESTARTABLE_RETURN_INT(::fsync(fd)); 4477 } 4478 4479 int os::available(int fd, jlong *bytes) { 4480 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 4481 "Assumed _thread_in_native"); 4482 jlong cur, end; 4483 int mode; 4484 struct stat64 buf64; 4485 4486 if (::fstat64(fd, &buf64) >= 0) { 4487 mode = buf64.st_mode; 4488 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 4489 int n,ioctl_return; 4490 4491 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return); 4492 if (ioctl_return>= 0) { 4493 *bytes = n; 4494 return 1; 4495 } 4496 } 4497 } 4498 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 4499 return 0; 4500 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 4501 return 0; 4502 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 4503 return 0; 4504 } 4505 *bytes = end - cur; 4506 return 1; 4507 } 4508 4509 // Map a block of memory. 4510 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4511 char *addr, size_t bytes, bool read_only, 4512 bool allow_exec) { 4513 int prot; 4514 int flags; 4515 4516 if (read_only) { 4517 prot = PROT_READ; 4518 flags = MAP_SHARED; 4519 } else { 4520 prot = PROT_READ | PROT_WRITE; 4521 flags = MAP_PRIVATE; 4522 } 4523 4524 if (allow_exec) { 4525 prot |= PROT_EXEC; 4526 } 4527 4528 if (addr != NULL) { 4529 flags |= MAP_FIXED; 4530 } 4531 4532 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 4533 fd, file_offset); 4534 if (mapped_address == MAP_FAILED) { 4535 return NULL; 4536 } 4537 return mapped_address; 4538 } 4539 4540 4541 // Remap a block of memory. 4542 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4543 char *addr, size_t bytes, bool read_only, 4544 bool allow_exec) { 4545 // same as map_memory() on this OS 4546 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4547 allow_exec); 4548 } 4549 4550 4551 // Unmap a block of memory. 4552 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4553 return munmap(addr, bytes) == 0; 4554 } 4555 4556 void os::pause() { 4557 char filename[MAX_PATH]; 4558 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4559 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4560 } else { 4561 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4562 } 4563 4564 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4565 if (fd != -1) { 4566 struct stat buf; 4567 ::close(fd); 4568 while (::stat(filename, &buf) == 0) { 4569 (void)::poll(NULL, 0, 100); 4570 } 4571 } else { 4572 jio_fprintf(stderr, 4573 "Could not open pause file '%s', continuing immediately.\n", filename); 4574 } 4575 } 4576 4577 #ifndef PRODUCT 4578 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4579 // Turn this on if you need to trace synch operations. 4580 // Set RECORD_SYNCH_LIMIT to a large-enough value, 4581 // and call record_synch_enable and record_synch_disable 4582 // around the computation of interest. 4583 4584 void record_synch(char* name, bool returning); // defined below 4585 4586 class RecordSynch { 4587 char* _name; 4588 public: 4589 RecordSynch(char* name) :_name(name) { record_synch(_name, false); } 4590 ~RecordSynch() { record_synch(_name, true); } 4591 }; 4592 4593 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 4594 extern "C" ret name params { \ 4595 typedef ret name##_t params; \ 4596 static name##_t* implem = NULL; \ 4597 static int callcount = 0; \ 4598 if (implem == NULL) { \ 4599 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 4600 if (implem == NULL) fatal(dlerror()); \ 4601 } \ 4602 ++callcount; \ 4603 RecordSynch _rs(#name); \ 4604 inner; \ 4605 return implem args; \ 4606 } 4607 // in dbx, examine callcounts this way: 4608 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 4609 4610 #define CHECK_POINTER_OK(p) \ 4611 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) 4612 #define CHECK_MU \ 4613 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 4614 #define CHECK_CV \ 4615 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 4616 #define CHECK_P(p) \ 4617 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 4618 4619 #define CHECK_MUTEX(mutex_op) \ 4620 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 4621 4622 CHECK_MUTEX( mutex_lock) 4623 CHECK_MUTEX( _mutex_lock) 4624 CHECK_MUTEX( mutex_unlock) 4625 CHECK_MUTEX(_mutex_unlock) 4626 CHECK_MUTEX( mutex_trylock) 4627 CHECK_MUTEX(_mutex_trylock) 4628 4629 #define CHECK_COND(cond_op) \ 4630 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV); 4631 4632 CHECK_COND( cond_wait); 4633 CHECK_COND(_cond_wait); 4634 CHECK_COND(_cond_wait_cancel); 4635 4636 #define CHECK_COND2(cond_op) \ 4637 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV); 4638 4639 CHECK_COND2( cond_timedwait); 4640 CHECK_COND2(_cond_timedwait); 4641 CHECK_COND2(_cond_timedwait_cancel); 4642 4643 // do the _lwp_* versions too 4644 #define mutex_t lwp_mutex_t 4645 #define cond_t lwp_cond_t 4646 CHECK_MUTEX( _lwp_mutex_lock) 4647 CHECK_MUTEX( _lwp_mutex_unlock) 4648 CHECK_MUTEX( _lwp_mutex_trylock) 4649 CHECK_MUTEX( __lwp_mutex_lock) 4650 CHECK_MUTEX( __lwp_mutex_unlock) 4651 CHECK_MUTEX( __lwp_mutex_trylock) 4652 CHECK_MUTEX(___lwp_mutex_lock) 4653 CHECK_MUTEX(___lwp_mutex_unlock) 4654 4655 CHECK_COND( _lwp_cond_wait); 4656 CHECK_COND( __lwp_cond_wait); 4657 CHECK_COND(___lwp_cond_wait); 4658 4659 CHECK_COND2( _lwp_cond_timedwait); 4660 CHECK_COND2( __lwp_cond_timedwait); 4661 #undef mutex_t 4662 #undef cond_t 4663 4664 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4665 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4666 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 4667 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 4668 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4669 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4670 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4671 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4672 4673 4674 // recording machinery: 4675 4676 enum { RECORD_SYNCH_LIMIT = 200 }; 4677 char* record_synch_name[RECORD_SYNCH_LIMIT]; 4678 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 4679 bool record_synch_returning[RECORD_SYNCH_LIMIT]; 4680 thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 4681 int record_synch_count = 0; 4682 bool record_synch_enabled = false; 4683 4684 // in dbx, examine recorded data this way: 4685 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 4686 4687 void record_synch(char* name, bool returning) { 4688 if (record_synch_enabled) { 4689 if (record_synch_count < RECORD_SYNCH_LIMIT) { 4690 record_synch_name[record_synch_count] = name; 4691 record_synch_returning[record_synch_count] = returning; 4692 record_synch_thread[record_synch_count] = thr_self(); 4693 record_synch_arg0ptr[record_synch_count] = &name; 4694 record_synch_count++; 4695 } 4696 // put more checking code here: 4697 // ... 4698 } 4699 } 4700 4701 void record_synch_enable() { 4702 // start collecting trace data, if not already doing so 4703 if (!record_synch_enabled) record_synch_count = 0; 4704 record_synch_enabled = true; 4705 } 4706 4707 void record_synch_disable() { 4708 // stop collecting trace data 4709 record_synch_enabled = false; 4710 } 4711 4712 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4713 #endif // PRODUCT 4714 4715 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4716 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 4717 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4718 4719 4720 // JVMTI & JVM monitoring and management support 4721 // The thread_cpu_time() and current_thread_cpu_time() are only 4722 // supported if is_thread_cpu_time_supported() returns true. 4723 // They are not supported on Solaris T1. 4724 4725 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4726 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4727 // of a thread. 4728 // 4729 // current_thread_cpu_time() and thread_cpu_time(Thread *) 4730 // returns the fast estimate available on the platform. 4731 4732 // hrtime_t gethrvtime() return value includes 4733 // user time but does not include system time 4734 jlong os::current_thread_cpu_time() { 4735 return (jlong) gethrvtime(); 4736 } 4737 4738 jlong os::thread_cpu_time(Thread *thread) { 4739 // return user level CPU time only to be consistent with 4740 // what current_thread_cpu_time returns. 4741 // thread_cpu_time_info() must be changed if this changes 4742 return os::thread_cpu_time(thread, false /* user time only */); 4743 } 4744 4745 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4746 if (user_sys_cpu_time) { 4747 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4748 } else { 4749 return os::current_thread_cpu_time(); 4750 } 4751 } 4752 4753 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 4754 char proc_name[64]; 4755 int count; 4756 prusage_t prusage; 4757 jlong lwp_time; 4758 int fd; 4759 4760 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 4761 getpid(), 4762 thread->osthread()->lwp_id()); 4763 fd = ::open(proc_name, O_RDONLY); 4764 if (fd == -1) return -1; 4765 4766 do { 4767 count = ::pread(fd, 4768 (void *)&prusage.pr_utime, 4769 thr_time_size, 4770 thr_time_off); 4771 } while (count < 0 && errno == EINTR); 4772 ::close(fd); 4773 if (count < 0) return -1; 4774 4775 if (user_sys_cpu_time) { 4776 // user + system CPU time 4777 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 4778 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 4779 (jlong)prusage.pr_stime.tv_nsec + 4780 (jlong)prusage.pr_utime.tv_nsec; 4781 } else { 4782 // user level CPU time only 4783 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 4784 (jlong)prusage.pr_utime.tv_nsec; 4785 } 4786 4787 return (lwp_time); 4788 } 4789 4790 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4791 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4792 info_ptr->may_skip_backward = false; // elapsed time not wall time 4793 info_ptr->may_skip_forward = false; // elapsed time not wall time 4794 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4795 } 4796 4797 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4798 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4799 info_ptr->may_skip_backward = false; // elapsed time not wall time 4800 info_ptr->may_skip_forward = false; // elapsed time not wall time 4801 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4802 } 4803 4804 bool os::is_thread_cpu_time_supported() { 4805 return true; 4806 } 4807 4808 // System loadavg support. Returns -1 if load average cannot be obtained. 4809 // Return the load average for our processor set if the primitive exists 4810 // (Solaris 9 and later). Otherwise just return system wide loadavg. 4811 int os::loadavg(double loadavg[], int nelem) { 4812 if (pset_getloadavg_ptr != NULL) { 4813 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 4814 } else { 4815 return ::getloadavg(loadavg, nelem); 4816 } 4817 } 4818 4819 //--------------------------------------------------------------------------------- 4820 4821 bool os::find(address addr, outputStream* st) { 4822 Dl_info dlinfo; 4823 memset(&dlinfo, 0, sizeof(dlinfo)); 4824 if (dladdr(addr, &dlinfo) != 0) { 4825 st->print(PTR_FORMAT ": ", addr); 4826 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 4827 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 4828 } else if (dlinfo.dli_fbase != NULL) { 4829 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 4830 } else { 4831 st->print("<absolute address>"); 4832 } 4833 if (dlinfo.dli_fname != NULL) { 4834 st->print(" in %s", dlinfo.dli_fname); 4835 } 4836 if (dlinfo.dli_fbase != NULL) { 4837 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 4838 } 4839 st->cr(); 4840 4841 if (Verbose) { 4842 // decode some bytes around the PC 4843 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 4844 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 4845 address lowest = (address) dlinfo.dli_sname; 4846 if (!lowest) lowest = (address) dlinfo.dli_fbase; 4847 if (begin < lowest) begin = lowest; 4848 Dl_info dlinfo2; 4849 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 4850 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 4851 end = (address) dlinfo2.dli_saddr; 4852 } 4853 Disassembler::decode(begin, end, st); 4854 } 4855 return true; 4856 } 4857 return false; 4858 } 4859 4860 // Following function has been added to support HotSparc's libjvm.so running 4861 // under Solaris production JDK 1.2.2 / 1.3.0. These came from 4862 // src/solaris/hpi/native_threads in the EVM codebase. 4863 // 4864 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 4865 // libraries and should thus be removed. We will leave it behind for a while 4866 // until we no longer want to able to run on top of 1.3.0 Solaris production 4867 // JDK. See 4341971. 4868 4869 #define STACK_SLACK 0x800 4870 4871 extern "C" { 4872 intptr_t sysThreadAvailableStackWithSlack() { 4873 stack_t st; 4874 intptr_t retval, stack_top; 4875 retval = thr_stksegment(&st); 4876 assert(retval == 0, "incorrect return value from thr_stksegment"); 4877 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 4878 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 4879 stack_top=(intptr_t)st.ss_sp-st.ss_size; 4880 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 4881 } 4882 } 4883 4884 // ObjectMonitor park-unpark infrastructure ... 4885 // 4886 // We implement Solaris and Linux PlatformEvents with the 4887 // obvious condvar-mutex-flag triple. 4888 // Another alternative that works quite well is pipes: 4889 // Each PlatformEvent consists of a pipe-pair. 4890 // The thread associated with the PlatformEvent 4891 // calls park(), which reads from the input end of the pipe. 4892 // Unpark() writes into the other end of the pipe. 4893 // The write-side of the pipe must be set NDELAY. 4894 // Unfortunately pipes consume a large # of handles. 4895 // Native solaris lwp_park() and lwp_unpark() work nicely, too. 4896 // Using pipes for the 1st few threads might be workable, however. 4897 // 4898 // park() is permitted to return spuriously. 4899 // Callers of park() should wrap the call to park() in 4900 // an appropriate loop. A litmus test for the correct 4901 // usage of park is the following: if park() were modified 4902 // to immediately return 0 your code should still work, 4903 // albeit degenerating to a spin loop. 4904 // 4905 // In a sense, park()-unpark() just provides more polite spinning 4906 // and polling with the key difference over naive spinning being 4907 // that a parked thread needs to be explicitly unparked() in order 4908 // to wake up and to poll the underlying condition. 4909 // 4910 // Assumption: 4911 // Only one parker can exist on an event, which is why we allocate 4912 // them per-thread. Multiple unparkers can coexist. 4913 // 4914 // _Event transitions in park() 4915 // -1 => -1 : illegal 4916 // 1 => 0 : pass - return immediately 4917 // 0 => -1 : block; then set _Event to 0 before returning 4918 // 4919 // _Event transitions in unpark() 4920 // 0 => 1 : just return 4921 // 1 => 1 : just return 4922 // -1 => either 0 or 1; must signal target thread 4923 // That is, we can safely transition _Event from -1 to either 4924 // 0 or 1. 4925 // 4926 // _Event serves as a restricted-range semaphore. 4927 // -1 : thread is blocked, i.e. there is a waiter 4928 // 0 : neutral: thread is running or ready, 4929 // could have been signaled after a wait started 4930 // 1 : signaled - thread is running or ready 4931 // 4932 // Another possible encoding of _Event would be with 4933 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 4934 // 4935 // TODO-FIXME: add DTRACE probes for: 4936 // 1. Tx parks 4937 // 2. Ty unparks Tx 4938 // 3. Tx resumes from park 4939 4940 4941 // value determined through experimentation 4942 #define ROUNDINGFIX 11 4943 4944 // utility to compute the abstime argument to timedwait. 4945 // TODO-FIXME: switch from compute_abstime() to unpackTime(). 4946 4947 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 4948 // millis is the relative timeout time 4949 // abstime will be the absolute timeout time 4950 if (millis < 0) millis = 0; 4951 struct timeval now; 4952 int status = gettimeofday(&now, NULL); 4953 assert(status == 0, "gettimeofday"); 4954 jlong seconds = millis / 1000; 4955 jlong max_wait_period; 4956 4957 if (UseLWPSynchronization) { 4958 // forward port of fix for 4275818 (not sleeping long enough) 4959 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 4960 // _lwp_cond_timedwait() used a round_down algorithm rather 4961 // than a round_up. For millis less than our roundfactor 4962 // it rounded down to 0 which doesn't meet the spec. 4963 // For millis > roundfactor we may return a bit sooner, but 4964 // since we can not accurately identify the patch level and 4965 // this has already been fixed in Solaris 9 and 8 we will 4966 // leave it alone rather than always rounding down. 4967 4968 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 4969 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 4970 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 4971 max_wait_period = 21000000; 4972 } else { 4973 max_wait_period = 50000000; 4974 } 4975 millis %= 1000; 4976 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 4977 seconds = max_wait_period; 4978 } 4979 abstime->tv_sec = now.tv_sec + seconds; 4980 long usec = now.tv_usec + millis * 1000; 4981 if (usec >= 1000000) { 4982 abstime->tv_sec += 1; 4983 usec -= 1000000; 4984 } 4985 abstime->tv_nsec = usec * 1000; 4986 return abstime; 4987 } 4988 4989 void os::PlatformEvent::park() { // AKA: down() 4990 // Transitions for _Event: 4991 // -1 => -1 : illegal 4992 // 1 => 0 : pass - return immediately 4993 // 0 => -1 : block; then set _Event to 0 before returning 4994 4995 // Invariant: Only the thread associated with the Event/PlatformEvent 4996 // may call park(). 4997 assert(_nParked == 0, "invariant"); 4998 4999 int v; 5000 for (;;) { 5001 v = _Event; 5002 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5003 } 5004 guarantee(v >= 0, "invariant"); 5005 if (v == 0) { 5006 // Do this the hard way by blocking ... 5007 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5008 int status = os::Solaris::mutex_lock(_mutex); 5009 assert_status(status == 0, status, "mutex_lock"); 5010 guarantee(_nParked == 0, "invariant"); 5011 ++_nParked; 5012 while (_Event < 0) { 5013 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 5014 // Treat this the same as if the wait was interrupted 5015 // With usr/lib/lwp going to kernel, always handle ETIME 5016 status = os::Solaris::cond_wait(_cond, _mutex); 5017 if (status == ETIME) status = EINTR; 5018 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 5019 } 5020 --_nParked; 5021 _Event = 0; 5022 status = os::Solaris::mutex_unlock(_mutex); 5023 assert_status(status == 0, status, "mutex_unlock"); 5024 // Paranoia to ensure our locked and lock-free paths interact 5025 // correctly with each other. 5026 OrderAccess::fence(); 5027 } 5028 } 5029 5030 int os::PlatformEvent::park(jlong millis) { 5031 // Transitions for _Event: 5032 // -1 => -1 : illegal 5033 // 1 => 0 : pass - return immediately 5034 // 0 => -1 : block; then set _Event to 0 before returning 5035 5036 guarantee(_nParked == 0, "invariant"); 5037 int v; 5038 for (;;) { 5039 v = _Event; 5040 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5041 } 5042 guarantee(v >= 0, "invariant"); 5043 if (v != 0) return OS_OK; 5044 5045 int ret = OS_TIMEOUT; 5046 timestruc_t abst; 5047 compute_abstime(&abst, millis); 5048 5049 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5050 int status = os::Solaris::mutex_lock(_mutex); 5051 assert_status(status == 0, status, "mutex_lock"); 5052 guarantee(_nParked == 0, "invariant"); 5053 ++_nParked; 5054 while (_Event < 0) { 5055 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 5056 assert_status(status == 0 || status == EINTR || 5057 status == ETIME || status == ETIMEDOUT, 5058 status, "cond_timedwait"); 5059 if (!FilterSpuriousWakeups) break; // previous semantics 5060 if (status == ETIME || status == ETIMEDOUT) break; 5061 // We consume and ignore EINTR and spurious wakeups. 5062 } 5063 --_nParked; 5064 if (_Event >= 0) ret = OS_OK; 5065 _Event = 0; 5066 status = os::Solaris::mutex_unlock(_mutex); 5067 assert_status(status == 0, status, "mutex_unlock"); 5068 // Paranoia to ensure our locked and lock-free paths interact 5069 // correctly with each other. 5070 OrderAccess::fence(); 5071 return ret; 5072 } 5073 5074 void os::PlatformEvent::unpark() { 5075 // Transitions for _Event: 5076 // 0 => 1 : just return 5077 // 1 => 1 : just return 5078 // -1 => either 0 or 1; must signal target thread 5079 // That is, we can safely transition _Event from -1 to either 5080 // 0 or 1. 5081 // See also: "Semaphores in Plan 9" by Mullender & Cox 5082 // 5083 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5084 // that it will take two back-to-back park() calls for the owning 5085 // thread to block. This has the benefit of forcing a spurious return 5086 // from the first park() call after an unpark() call which will help 5087 // shake out uses of park() and unpark() without condition variables. 5088 5089 if (Atomic::xchg(1, &_Event) >= 0) return; 5090 5091 // If the thread associated with the event was parked, wake it. 5092 // Wait for the thread assoc with the PlatformEvent to vacate. 5093 int status = os::Solaris::mutex_lock(_mutex); 5094 assert_status(status == 0, status, "mutex_lock"); 5095 int AnyWaiters = _nParked; 5096 status = os::Solaris::mutex_unlock(_mutex); 5097 assert_status(status == 0, status, "mutex_unlock"); 5098 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 5099 if (AnyWaiters != 0) { 5100 // Note that we signal() *after* dropping the lock for "immortal" Events. 5101 // This is safe and avoids a common class of futile wakeups. In rare 5102 // circumstances this can cause a thread to return prematurely from 5103 // cond_{timed}wait() but the spurious wakeup is benign and the victim 5104 // will simply re-test the condition and re-park itself. 5105 // This provides particular benefit if the underlying platform does not 5106 // provide wait morphing. 5107 status = os::Solaris::cond_signal(_cond); 5108 assert_status(status == 0, status, "cond_signal"); 5109 } 5110 } 5111 5112 // JSR166 5113 // ------------------------------------------------------- 5114 5115 // The solaris and linux implementations of park/unpark are fairly 5116 // conservative for now, but can be improved. They currently use a 5117 // mutex/condvar pair, plus _counter. 5118 // Park decrements _counter if > 0, else does a condvar wait. Unpark 5119 // sets count to 1 and signals condvar. Only one thread ever waits 5120 // on the condvar. Contention seen when trying to park implies that someone 5121 // is unparking you, so don't wait. And spurious returns are fine, so there 5122 // is no need to track notifications. 5123 5124 #define MAX_SECS 100000000 5125 5126 // This code is common to linux and solaris and will be moved to a 5127 // common place in dolphin. 5128 // 5129 // The passed in time value is either a relative time in nanoseconds 5130 // or an absolute time in milliseconds. Either way it has to be unpacked 5131 // into suitable seconds and nanoseconds components and stored in the 5132 // given timespec structure. 5133 // Given time is a 64-bit value and the time_t used in the timespec is only 5134 // a signed-32-bit value (except on 64-bit Linux) we have to watch for 5135 // overflow if times way in the future are given. Further on Solaris versions 5136 // prior to 10 there is a restriction (see cond_timedwait) that the specified 5137 // number of seconds, in abstime, is less than current_time + 100,000,000. 5138 // As it will be 28 years before "now + 100000000" will overflow we can 5139 // ignore overflow and just impose a hard-limit on seconds using the value 5140 // of "now + 100,000,000". This places a limit on the timeout of about 3.17 5141 // years from "now". 5142 // 5143 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 5144 assert(time > 0, "convertTime"); 5145 5146 struct timeval now; 5147 int status = gettimeofday(&now, NULL); 5148 assert(status == 0, "gettimeofday"); 5149 5150 time_t max_secs = now.tv_sec + MAX_SECS; 5151 5152 if (isAbsolute) { 5153 jlong secs = time / 1000; 5154 if (secs > max_secs) { 5155 absTime->tv_sec = max_secs; 5156 } else { 5157 absTime->tv_sec = secs; 5158 } 5159 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 5160 } else { 5161 jlong secs = time / NANOSECS_PER_SEC; 5162 if (secs >= MAX_SECS) { 5163 absTime->tv_sec = max_secs; 5164 absTime->tv_nsec = 0; 5165 } else { 5166 absTime->tv_sec = now.tv_sec + secs; 5167 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 5168 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 5169 absTime->tv_nsec -= NANOSECS_PER_SEC; 5170 ++absTime->tv_sec; // note: this must be <= max_secs 5171 } 5172 } 5173 } 5174 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 5175 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 5176 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 5177 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 5178 } 5179 5180 void Parker::park(bool isAbsolute, jlong time) { 5181 // Ideally we'd do something useful while spinning, such 5182 // as calling unpackTime(). 5183 5184 // Optional fast-path check: 5185 // Return immediately if a permit is available. 5186 // We depend on Atomic::xchg() having full barrier semantics 5187 // since we are doing a lock-free update to _counter. 5188 if (Atomic::xchg(0, &_counter) > 0) return; 5189 5190 // Optional fast-exit: Check interrupt before trying to wait 5191 Thread* thread = Thread::current(); 5192 assert(thread->is_Java_thread(), "Must be JavaThread"); 5193 JavaThread *jt = (JavaThread *)thread; 5194 if (Thread::is_interrupted(thread, false)) { 5195 return; 5196 } 5197 5198 // First, demultiplex/decode time arguments 5199 timespec absTime; 5200 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all 5201 return; 5202 } 5203 if (time > 0) { 5204 // Warning: this code might be exposed to the old Solaris time 5205 // round-down bugs. Grep "roundingFix" for details. 5206 unpackTime(&absTime, isAbsolute, time); 5207 } 5208 5209 // Enter safepoint region 5210 // Beware of deadlocks such as 6317397. 5211 // The per-thread Parker:: _mutex is a classic leaf-lock. 5212 // In particular a thread must never block on the Threads_lock while 5213 // holding the Parker:: mutex. If safepoints are pending both the 5214 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 5215 ThreadBlockInVM tbivm(jt); 5216 5217 // Don't wait if cannot get lock since interference arises from 5218 // unblocking. Also. check interrupt before trying wait 5219 if (Thread::is_interrupted(thread, false) || 5220 os::Solaris::mutex_trylock(_mutex) != 0) { 5221 return; 5222 } 5223 5224 int status; 5225 5226 if (_counter > 0) { // no wait needed 5227 _counter = 0; 5228 status = os::Solaris::mutex_unlock(_mutex); 5229 assert(status == 0, "invariant"); 5230 // Paranoia to ensure our locked and lock-free paths interact 5231 // correctly with each other and Java-level accesses. 5232 OrderAccess::fence(); 5233 return; 5234 } 5235 5236 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5237 jt->set_suspend_equivalent(); 5238 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 5239 5240 // Do this the hard way by blocking ... 5241 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5242 if (time == 0) { 5243 status = os::Solaris::cond_wait(_cond, _mutex); 5244 } else { 5245 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 5246 } 5247 // Note that an untimed cond_wait() can sometimes return ETIME on older 5248 // versions of the Solaris. 5249 assert_status(status == 0 || status == EINTR || 5250 status == ETIME || status == ETIMEDOUT, 5251 status, "cond_timedwait"); 5252 5253 _counter = 0; 5254 status = os::Solaris::mutex_unlock(_mutex); 5255 assert_status(status == 0, status, "mutex_unlock"); 5256 // Paranoia to ensure our locked and lock-free paths interact 5257 // correctly with each other and Java-level accesses. 5258 OrderAccess::fence(); 5259 5260 // If externally suspended while waiting, re-suspend 5261 if (jt->handle_special_suspend_equivalent_condition()) { 5262 jt->java_suspend_self(); 5263 } 5264 } 5265 5266 void Parker::unpark() { 5267 int status = os::Solaris::mutex_lock(_mutex); 5268 assert(status == 0, "invariant"); 5269 const int s = _counter; 5270 _counter = 1; 5271 status = os::Solaris::mutex_unlock(_mutex); 5272 assert(status == 0, "invariant"); 5273 5274 if (s < 1) { 5275 status = os::Solaris::cond_signal(_cond); 5276 assert(status == 0, "invariant"); 5277 } 5278 } 5279 5280 extern char** environ; 5281 5282 // Run the specified command in a separate process. Return its exit value, 5283 // or -1 on failure (e.g. can't fork a new process). 5284 // Unlike system(), this function can be called from signal handler. It 5285 // doesn't block SIGINT et al. 5286 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) { 5287 char * argv[4]; 5288 argv[0] = (char *)"sh"; 5289 argv[1] = (char *)"-c"; 5290 argv[2] = cmd; 5291 argv[3] = NULL; 5292 5293 // fork is async-safe, fork1 is not so can't use in signal handler 5294 pid_t pid; 5295 Thread* t = Thread::current_or_null_safe(); 5296 if (t != NULL && t->is_inside_signal_handler()) { 5297 pid = fork(); 5298 } else { 5299 pid = fork1(); 5300 } 5301 5302 if (pid < 0) { 5303 // fork failed 5304 warning("fork failed: %s", os::strerror(errno)); 5305 return -1; 5306 5307 } else if (pid == 0) { 5308 // child process 5309 5310 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 5311 execve("/usr/bin/sh", argv, environ); 5312 5313 // execve failed 5314 _exit(-1); 5315 5316 } else { 5317 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5318 // care about the actual exit code, for now. 5319 5320 int status; 5321 5322 // Wait for the child process to exit. This returns immediately if 5323 // the child has already exited. */ 5324 while (waitpid(pid, &status, 0) < 0) { 5325 switch (errno) { 5326 case ECHILD: return 0; 5327 case EINTR: break; 5328 default: return -1; 5329 } 5330 } 5331 5332 if (WIFEXITED(status)) { 5333 // The child exited normally; get its exit code. 5334 return WEXITSTATUS(status); 5335 } else if (WIFSIGNALED(status)) { 5336 // The child exited because of a signal 5337 // The best value to return is 0x80 + signal number, 5338 // because that is what all Unix shells do, and because 5339 // it allows callers to distinguish between process exit and 5340 // process death by signal. 5341 return 0x80 + WTERMSIG(status); 5342 } else { 5343 // Unknown exit code; pass it through 5344 return status; 5345 } 5346 } 5347 } 5348 5349 size_t os::write(int fd, const void *buf, unsigned int nBytes) { 5350 size_t res; 5351 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res); 5352 return res; 5353 } 5354 5355 int os::close(int fd) { 5356 return ::close(fd); 5357 } 5358 5359 int os::socket_close(int fd) { 5360 return ::close(fd); 5361 } 5362 5363 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5364 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5365 "Assumed _thread_in_native"); 5366 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags)); 5367 } 5368 5369 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5370 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5371 "Assumed _thread_in_native"); 5372 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5373 } 5374 5375 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5376 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5377 } 5378 5379 // As both poll and select can be interrupted by signals, we have to be 5380 // prepared to restart the system call after updating the timeout, unless 5381 // a poll() is done with timeout == -1, in which case we repeat with this 5382 // "wait forever" value. 5383 5384 int os::connect(int fd, struct sockaddr *him, socklen_t len) { 5385 int _result; 5386 _result = ::connect(fd, him, len); 5387 5388 // On Solaris, when a connect() call is interrupted, the connection 5389 // can be established asynchronously (see 6343810). Subsequent calls 5390 // to connect() must check the errno value which has the semantic 5391 // described below (copied from the connect() man page). Handling 5392 // of asynchronously established connections is required for both 5393 // blocking and non-blocking sockets. 5394 // EINTR The connection attempt was interrupted 5395 // before any data arrived by the delivery of 5396 // a signal. The connection, however, will be 5397 // established asynchronously. 5398 // 5399 // EINPROGRESS The socket is non-blocking, and the connec- 5400 // tion cannot be completed immediately. 5401 // 5402 // EALREADY The socket is non-blocking, and a previous 5403 // connection attempt has not yet been com- 5404 // pleted. 5405 // 5406 // EISCONN The socket is already connected. 5407 if (_result == OS_ERR && errno == EINTR) { 5408 // restarting a connect() changes its errno semantics 5409 RESTARTABLE(::connect(fd, him, len), _result); 5410 // undo these changes 5411 if (_result == OS_ERR) { 5412 if (errno == EALREADY) { 5413 errno = EINPROGRESS; // fall through 5414 } else if (errno == EISCONN) { 5415 errno = 0; 5416 return OS_OK; 5417 } 5418 } 5419 } 5420 return _result; 5421 } 5422 5423 // Get the default path to the core file 5424 // Returns the length of the string 5425 int os::get_core_path(char* buffer, size_t bufferSize) { 5426 const char* p = get_current_directory(buffer, bufferSize); 5427 5428 if (p == NULL) { 5429 assert(p != NULL, "failed to get current directory"); 5430 return 0; 5431 } 5432 5433 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 5434 p, current_process_id()); 5435 5436 return strlen(buffer); 5437 } 5438 5439 #ifndef PRODUCT 5440 void TestReserveMemorySpecial_test() { 5441 // No tests available for this platform 5442 } 5443 #endif 5444 5445 bool os::start_debugging(char *buf, int buflen) { 5446 int len = (int)strlen(buf); 5447 char *p = &buf[len]; 5448 5449 jio_snprintf(p, buflen-len, 5450 "\n\n" 5451 "Do you want to debug the problem?\n\n" 5452 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n" 5453 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 5454 "Otherwise, press RETURN to abort...", 5455 os::current_process_id(), os::current_thread_id()); 5456 5457 bool yes = os::message_box("Unexpected Error", buf); 5458 5459 if (yes) { 5460 // yes, user asked VM to launch debugger 5461 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id()); 5462 5463 os::fork_and_exec(buf); 5464 yes = false; 5465 } 5466 return yes; 5467 }