1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // no precompiled headers 26 #include "jvm.h" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/systemDictionary.hpp" 29 #include "classfile/vmSymbols.hpp" 30 #include "code/icBuffer.hpp" 31 #include "code/vtableStubs.hpp" 32 #include "compiler/compileBroker.hpp" 33 #include "compiler/disassembler.hpp" 34 #include "interpreter/interpreter.hpp" 35 #include "logging/log.hpp" 36 #include "memory/allocation.inline.hpp" 37 #include "memory/filemap.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "os_share_solaris.hpp" 40 #include "os_solaris.inline.hpp" 41 #include "prims/jniFastGetField.hpp" 42 #include "prims/jvm_misc.hpp" 43 #include "runtime/arguments.hpp" 44 #include "runtime/atomic.hpp" 45 #include "runtime/extendedPC.hpp" 46 #include "runtime/globals.hpp" 47 #include "runtime/interfaceSupport.hpp" 48 #include "runtime/java.hpp" 49 #include "runtime/javaCalls.hpp" 50 #include "runtime/mutexLocker.hpp" 51 #include "runtime/objectMonitor.hpp" 52 #include "runtime/orderAccess.inline.hpp" 53 #include "runtime/osThread.hpp" 54 #include "runtime/perfMemory.hpp" 55 #include "runtime/sharedRuntime.hpp" 56 #include "runtime/statSampler.hpp" 57 #include "runtime/stubRoutines.hpp" 58 #include "runtime/thread.inline.hpp" 59 #include "runtime/threadCritical.hpp" 60 #include "runtime/timer.hpp" 61 #include "runtime/vm_version.hpp" 62 #include "semaphore_posix.hpp" 63 #include "services/attachListener.hpp" 64 #include "services/memTracker.hpp" 65 #include "services/runtimeService.hpp" 66 #include "utilities/align.hpp" 67 #include "utilities/decoder.hpp" 68 #include "utilities/defaultStream.hpp" 69 #include "utilities/events.hpp" 70 #include "utilities/growableArray.hpp" 71 #include "utilities/macros.hpp" 72 #include "utilities/vmError.hpp" 73 74 // put OS-includes here 75 # include <dlfcn.h> 76 # include <errno.h> 77 # include <exception> 78 # include <link.h> 79 # include <poll.h> 80 # include <pthread.h> 81 # include <schedctl.h> 82 # include <setjmp.h> 83 # include <signal.h> 84 # include <stdio.h> 85 # include <alloca.h> 86 # include <sys/filio.h> 87 # include <sys/ipc.h> 88 # include <sys/lwp.h> 89 # include <sys/machelf.h> // for elf Sym structure used by dladdr1 90 # include <sys/mman.h> 91 # include <sys/processor.h> 92 # include <sys/procset.h> 93 # include <sys/pset.h> 94 # include <sys/resource.h> 95 # include <sys/shm.h> 96 # include <sys/socket.h> 97 # include <sys/stat.h> 98 # include <sys/systeminfo.h> 99 # include <sys/time.h> 100 # include <sys/times.h> 101 # include <sys/types.h> 102 # include <sys/wait.h> 103 # include <sys/utsname.h> 104 # include <thread.h> 105 # include <unistd.h> 106 # include <sys/priocntl.h> 107 # include <sys/rtpriocntl.h> 108 # include <sys/tspriocntl.h> 109 # include <sys/iapriocntl.h> 110 # include <sys/fxpriocntl.h> 111 # include <sys/loadavg.h> 112 # include <string.h> 113 # include <stdio.h> 114 115 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 116 # include <sys/procfs.h> // see comment in <sys/procfs.h> 117 118 #define MAX_PATH (2 * K) 119 120 // for timer info max values which include all bits 121 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 122 123 124 // Here are some liblgrp types from sys/lgrp_user.h to be able to 125 // compile on older systems without this header file. 126 127 #ifndef MADV_ACCESS_LWP 128 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */ 129 #endif 130 #ifndef MADV_ACCESS_MANY 131 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */ 132 #endif 133 134 #ifndef LGRP_RSRC_CPU 135 #define LGRP_RSRC_CPU 0 /* CPU resources */ 136 #endif 137 #ifndef LGRP_RSRC_MEM 138 #define LGRP_RSRC_MEM 1 /* memory resources */ 139 #endif 140 141 // Values for ThreadPriorityPolicy == 1 142 int prio_policy1[CriticalPriority+1] = { 143 -99999, 0, 16, 32, 48, 64, 144 80, 96, 112, 124, 127, 127 }; 145 146 // System parameters used internally 147 static clock_t clock_tics_per_sec = 100; 148 149 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+) 150 static bool enabled_extended_FILE_stdio = false; 151 152 // For diagnostics to print a message once. see run_periodic_checks 153 static bool check_addr0_done = false; 154 static sigset_t check_signal_done; 155 static bool check_signals = true; 156 157 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo 158 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo 159 160 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround 161 162 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL; 163 164 // "default" initializers for missing libc APIs 165 extern "C" { 166 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 167 static int lwp_mutex_destroy(mutex_t *mx) { return 0; } 168 169 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 170 static int lwp_cond_destroy(cond_t *cv) { return 0; } 171 } 172 173 // "default" initializers for pthread-based synchronization 174 extern "C" { 175 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 176 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 177 } 178 179 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); 180 181 static inline size_t adjust_stack_size(address base, size_t size) { 182 if ((ssize_t)size < 0) { 183 // 4759953: Compensate for ridiculous stack size. 184 size = max_intx; 185 } 186 if (size > (size_t)base) { 187 // 4812466: Make sure size doesn't allow the stack to wrap the address space. 188 size = (size_t)base; 189 } 190 return size; 191 } 192 193 static inline stack_t get_stack_info() { 194 stack_t st; 195 int retval = thr_stksegment(&st); 196 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); 197 assert(retval == 0, "incorrect return value from thr_stksegment"); 198 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 199 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 200 return st; 201 } 202 203 bool os::is_primordial_thread(void) { 204 int r = thr_main(); 205 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 206 return r == 1; 207 } 208 209 address os::current_stack_base() { 210 bool _is_primordial_thread = is_primordial_thread(); 211 212 // Workaround 4352906, avoid calls to thr_stksegment by 213 // thr_main after the first one (it looks like we trash 214 // some data, causing the value for ss_sp to be incorrect). 215 if (!_is_primordial_thread || os::Solaris::_main_stack_base == NULL) { 216 stack_t st = get_stack_info(); 217 if (_is_primordial_thread) { 218 // cache initial value of stack base 219 os::Solaris::_main_stack_base = (address)st.ss_sp; 220 } 221 return (address)st.ss_sp; 222 } else { 223 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); 224 return os::Solaris::_main_stack_base; 225 } 226 } 227 228 size_t os::current_stack_size() { 229 size_t size; 230 231 if (!is_primordial_thread()) { 232 size = get_stack_info().ss_size; 233 } else { 234 struct rlimit limits; 235 getrlimit(RLIMIT_STACK, &limits); 236 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); 237 } 238 // base may not be page aligned 239 address base = current_stack_base(); 240 address bottom = align_up(base - size, os::vm_page_size());; 241 return (size_t)(base - bottom); 242 } 243 244 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 245 return localtime_r(clock, res); 246 } 247 248 void os::Solaris::try_enable_extended_io() { 249 typedef int (*enable_extended_FILE_stdio_t)(int, int); 250 251 if (!UseExtendedFileIO) { 252 return; 253 } 254 255 enable_extended_FILE_stdio_t enabler = 256 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT, 257 "enable_extended_FILE_stdio"); 258 if (enabler) { 259 enabler(-1, -1); 260 } 261 } 262 263 static int _processors_online = 0; 264 265 jint os::Solaris::_os_thread_limit = 0; 266 volatile jint os::Solaris::_os_thread_count = 0; 267 268 julong os::available_memory() { 269 return Solaris::available_memory(); 270 } 271 272 julong os::Solaris::available_memory() { 273 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); 274 } 275 276 julong os::Solaris::_physical_memory = 0; 277 278 julong os::physical_memory() { 279 return Solaris::physical_memory(); 280 } 281 282 static hrtime_t first_hrtime = 0; 283 static const hrtime_t hrtime_hz = 1000*1000*1000; 284 static volatile hrtime_t max_hrtime = 0; 285 286 287 void os::Solaris::initialize_system_info() { 288 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); 289 _processors_online = sysconf(_SC_NPROCESSORS_ONLN); 290 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * 291 (julong)sysconf(_SC_PAGESIZE); 292 } 293 294 int os::active_processor_count() { 295 // User has overridden the number of active processors 296 if (ActiveProcessorCount > 0) { 297 log_trace(os)("active_processor_count: " 298 "active processor count set by user : %d", 299 ActiveProcessorCount); 300 return ActiveProcessorCount; 301 } 302 303 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 304 pid_t pid = getpid(); 305 psetid_t pset = PS_NONE; 306 // Are we running in a processor set or is there any processor set around? 307 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) { 308 uint_t pset_cpus; 309 // Query the number of cpus available to us. 310 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) { 311 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check"); 312 _processors_online = pset_cpus; 313 return pset_cpus; 314 } 315 } 316 // Otherwise return number of online cpus 317 return online_cpus; 318 } 319 320 static bool find_processors_in_pset(psetid_t pset, 321 processorid_t** id_array, 322 uint_t* id_length) { 323 bool result = false; 324 // Find the number of processors in the processor set. 325 if (pset_info(pset, NULL, id_length, NULL) == 0) { 326 // Make up an array to hold their ids. 327 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 328 // Fill in the array with their processor ids. 329 if (pset_info(pset, NULL, id_length, *id_array) == 0) { 330 result = true; 331 } 332 } 333 return result; 334 } 335 336 // Callers of find_processors_online() must tolerate imprecise results -- 337 // the system configuration can change asynchronously because of DR 338 // or explicit psradm operations. 339 // 340 // We also need to take care that the loop (below) terminates as the 341 // number of processors online can change between the _SC_NPROCESSORS_ONLN 342 // request and the loop that builds the list of processor ids. Unfortunately 343 // there's no reliable way to determine the maximum valid processor id, 344 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online 345 // man pages, which claim the processor id set is "sparse, but 346 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually 347 // exit the loop. 348 // 349 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's 350 // not available on S8.0. 351 352 static bool find_processors_online(processorid_t** id_array, 353 uint* id_length) { 354 const processorid_t MAX_PROCESSOR_ID = 100000; 355 // Find the number of processors online. 356 *id_length = sysconf(_SC_NPROCESSORS_ONLN); 357 // Make up an array to hold their ids. 358 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 359 // Processors need not be numbered consecutively. 360 long found = 0; 361 processorid_t next = 0; 362 while (found < *id_length && next < MAX_PROCESSOR_ID) { 363 processor_info_t info; 364 if (processor_info(next, &info) == 0) { 365 // NB, PI_NOINTR processors are effectively online ... 366 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) { 367 (*id_array)[found] = next; 368 found += 1; 369 } 370 } 371 next += 1; 372 } 373 if (found < *id_length) { 374 // The loop above didn't identify the expected number of processors. 375 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN) 376 // and re-running the loop, above, but there's no guarantee of progress 377 // if the system configuration is in flux. Instead, we just return what 378 // we've got. Note that in the worst case find_processors_online() could 379 // return an empty set. (As a fall-back in the case of the empty set we 380 // could just return the ID of the current processor). 381 *id_length = found; 382 } 383 384 return true; 385 } 386 387 static bool assign_distribution(processorid_t* id_array, 388 uint id_length, 389 uint* distribution, 390 uint distribution_length) { 391 // We assume we can assign processorid_t's to uint's. 392 assert(sizeof(processorid_t) == sizeof(uint), 393 "can't convert processorid_t to uint"); 394 // Quick check to see if we won't succeed. 395 if (id_length < distribution_length) { 396 return false; 397 } 398 // Assign processor ids to the distribution. 399 // Try to shuffle processors to distribute work across boards, 400 // assuming 4 processors per board. 401 const uint processors_per_board = ProcessDistributionStride; 402 // Find the maximum processor id. 403 processorid_t max_id = 0; 404 for (uint m = 0; m < id_length; m += 1) { 405 max_id = MAX2(max_id, id_array[m]); 406 } 407 // The next id, to limit loops. 408 const processorid_t limit_id = max_id + 1; 409 // Make up markers for available processors. 410 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal); 411 for (uint c = 0; c < limit_id; c += 1) { 412 available_id[c] = false; 413 } 414 for (uint a = 0; a < id_length; a += 1) { 415 available_id[id_array[a]] = true; 416 } 417 // Step by "boards", then by "slot", copying to "assigned". 418 // NEEDS_CLEANUP: The assignment of processors should be stateful, 419 // remembering which processors have been assigned by 420 // previous calls, etc., so as to distribute several 421 // independent calls of this method. What we'd like is 422 // It would be nice to have an API that let us ask 423 // how many processes are bound to a processor, 424 // but we don't have that, either. 425 // In the short term, "board" is static so that 426 // subsequent distributions don't all start at board 0. 427 static uint board = 0; 428 uint assigned = 0; 429 // Until we've found enough processors .... 430 while (assigned < distribution_length) { 431 // ... find the next available processor in the board. 432 for (uint slot = 0; slot < processors_per_board; slot += 1) { 433 uint try_id = board * processors_per_board + slot; 434 if ((try_id < limit_id) && (available_id[try_id] == true)) { 435 distribution[assigned] = try_id; 436 available_id[try_id] = false; 437 assigned += 1; 438 break; 439 } 440 } 441 board += 1; 442 if (board * processors_per_board + 0 >= limit_id) { 443 board = 0; 444 } 445 } 446 if (available_id != NULL) { 447 FREE_C_HEAP_ARRAY(bool, available_id); 448 } 449 return true; 450 } 451 452 void os::set_native_thread_name(const char *name) { 453 if (Solaris::_pthread_setname_np != NULL) { 454 // Only the first 31 bytes of 'name' are processed by pthread_setname_np 455 // but we explicitly copy into a size-limited buffer to avoid any 456 // possible overflow. 457 char buf[32]; 458 snprintf(buf, sizeof(buf), "%s", name); 459 buf[sizeof(buf) - 1] = '\0'; 460 Solaris::_pthread_setname_np(pthread_self(), buf); 461 } 462 } 463 464 bool os::distribute_processes(uint length, uint* distribution) { 465 bool result = false; 466 // Find the processor id's of all the available CPUs. 467 processorid_t* id_array = NULL; 468 uint id_length = 0; 469 // There are some races between querying information and using it, 470 // since processor sets can change dynamically. 471 psetid_t pset = PS_NONE; 472 // Are we running in a processor set? 473 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) { 474 result = find_processors_in_pset(pset, &id_array, &id_length); 475 } else { 476 result = find_processors_online(&id_array, &id_length); 477 } 478 if (result == true) { 479 if (id_length >= length) { 480 result = assign_distribution(id_array, id_length, distribution, length); 481 } else { 482 result = false; 483 } 484 } 485 if (id_array != NULL) { 486 FREE_C_HEAP_ARRAY(processorid_t, id_array); 487 } 488 return result; 489 } 490 491 bool os::bind_to_processor(uint processor_id) { 492 // We assume that a processorid_t can be stored in a uint. 493 assert(sizeof(uint) == sizeof(processorid_t), 494 "can't convert uint to processorid_t"); 495 int bind_result = 496 processor_bind(P_LWPID, // bind LWP. 497 P_MYID, // bind current LWP. 498 (processorid_t) processor_id, // id. 499 NULL); // don't return old binding. 500 return (bind_result == 0); 501 } 502 503 // Return true if user is running as root. 504 505 bool os::have_special_privileges() { 506 static bool init = false; 507 static bool privileges = false; 508 if (!init) { 509 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 510 init = true; 511 } 512 return privileges; 513 } 514 515 516 void os::init_system_properties_values() { 517 // The next steps are taken in the product version: 518 // 519 // Obtain the JAVA_HOME value from the location of libjvm.so. 520 // This library should be located at: 521 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 522 // 523 // If "/jre/lib/" appears at the right place in the path, then we 524 // assume libjvm.so is installed in a JDK and we use this path. 525 // 526 // Otherwise exit with message: "Could not create the Java virtual machine." 527 // 528 // The following extra steps are taken in the debugging version: 529 // 530 // If "/jre/lib/" does NOT appear at the right place in the path 531 // instead of exit check for $JAVA_HOME environment variable. 532 // 533 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 534 // then we append a fake suffix "hotspot/libjvm.so" to this path so 535 // it looks like libjvm.so is installed there 536 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 537 // 538 // Otherwise exit. 539 // 540 // Important note: if the location of libjvm.so changes this 541 // code needs to be changed accordingly. 542 543 // Base path of extensions installed on the system. 544 #define SYS_EXT_DIR "/usr/jdk/packages" 545 #define EXTENSIONS_DIR "/lib/ext" 546 547 // Buffer that fits several sprintfs. 548 // Note that the space for the colon and the trailing null are provided 549 // by the nulls included by the sizeof operator. 550 const size_t bufsize = 551 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends. 552 sizeof(SYS_EXT_DIR) + sizeof("/lib/"), // invariant ld_library_path 553 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir 554 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 555 556 // sysclasspath, java_home, dll_dir 557 { 558 char *pslash; 559 os::jvm_path(buf, bufsize); 560 561 // Found the full path to libjvm.so. 562 // Now cut the path to <java_home>/jre if we can. 563 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 564 pslash = strrchr(buf, '/'); 565 if (pslash != NULL) { 566 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 567 } 568 Arguments::set_dll_dir(buf); 569 570 if (pslash != NULL) { 571 pslash = strrchr(buf, '/'); 572 if (pslash != NULL) { 573 *pslash = '\0'; // Get rid of /lib. 574 } 575 } 576 Arguments::set_java_home(buf); 577 set_boot_path('/', ':'); 578 } 579 580 // Where to look for native libraries. 581 { 582 // Use dlinfo() to determine the correct java.library.path. 583 // 584 // If we're launched by the Java launcher, and the user 585 // does not set java.library.path explicitly on the commandline, 586 // the Java launcher sets LD_LIBRARY_PATH for us and unsets 587 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case 588 // dlinfo returns LD_LIBRARY_PATH + crle settings (including 589 // /usr/lib), which is exactly what we want. 590 // 591 // If the user does set java.library.path, it completely 592 // overwrites this setting, and always has. 593 // 594 // If we're not launched by the Java launcher, we may 595 // get here with any/all of the LD_LIBRARY_PATH[_32|64] 596 // settings. Again, dlinfo does exactly what we want. 597 598 Dl_serinfo info_sz, *info = &info_sz; 599 Dl_serpath *path; 600 char *library_path; 601 char *common_path = buf; 602 603 // Determine search path count and required buffer size. 604 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) { 605 FREE_C_HEAP_ARRAY(char, buf); 606 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror()); 607 } 608 609 // Allocate new buffer and initialize. 610 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal); 611 info->dls_size = info_sz.dls_size; 612 info->dls_cnt = info_sz.dls_cnt; 613 614 // Obtain search path information. 615 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) { 616 FREE_C_HEAP_ARRAY(char, buf); 617 FREE_C_HEAP_ARRAY(char, info); 618 vm_exit_during_initialization("dlinfo SERINFO request", dlerror()); 619 } 620 621 path = &info->dls_serpath[0]; 622 623 // Note: Due to a legacy implementation, most of the library path 624 // is set in the launcher. This was to accomodate linking restrictions 625 // on legacy Solaris implementations (which are no longer supported). 626 // Eventually, all the library path setting will be done here. 627 // 628 // However, to prevent the proliferation of improperly built native 629 // libraries, the new path component /usr/jdk/packages is added here. 630 631 // Construct the invariant part of ld_library_path. 632 sprintf(common_path, SYS_EXT_DIR "/lib"); 633 634 // Struct size is more than sufficient for the path components obtained 635 // through the dlinfo() call, so only add additional space for the path 636 // components explicitly added here. 637 size_t library_path_size = info->dls_size + strlen(common_path); 638 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal); 639 library_path[0] = '\0'; 640 641 // Construct the desired Java library path from the linker's library 642 // search path. 643 // 644 // For compatibility, it is optimal that we insert the additional path 645 // components specific to the Java VM after those components specified 646 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so 647 // infrastructure. 648 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it. 649 strcpy(library_path, common_path); 650 } else { 651 int inserted = 0; 652 int i; 653 for (i = 0; i < info->dls_cnt; i++, path++) { 654 uint_t flags = path->dls_flags & LA_SER_MASK; 655 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) { 656 strcat(library_path, common_path); 657 strcat(library_path, os::path_separator()); 658 inserted = 1; 659 } 660 strcat(library_path, path->dls_name); 661 strcat(library_path, os::path_separator()); 662 } 663 // Eliminate trailing path separator. 664 library_path[strlen(library_path)-1] = '\0'; 665 } 666 667 // happens before argument parsing - can't use a trace flag 668 // tty->print_raw("init_system_properties_values: native lib path: "); 669 // tty->print_raw_cr(library_path); 670 671 // Callee copies into its own buffer. 672 Arguments::set_library_path(library_path); 673 674 FREE_C_HEAP_ARRAY(char, library_path); 675 FREE_C_HEAP_ARRAY(char, info); 676 } 677 678 // Extensions directories. 679 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); 680 Arguments::set_ext_dirs(buf); 681 682 FREE_C_HEAP_ARRAY(char, buf); 683 684 #undef SYS_EXT_DIR 685 #undef EXTENSIONS_DIR 686 } 687 688 void os::breakpoint() { 689 BREAKPOINT; 690 } 691 692 bool os::obsolete_option(const JavaVMOption *option) { 693 if (!strncmp(option->optionString, "-Xt", 3)) { 694 return true; 695 } else if (!strncmp(option->optionString, "-Xtm", 4)) { 696 return true; 697 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) { 698 return true; 699 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) { 700 return true; 701 } 702 return false; 703 } 704 705 bool os::Solaris::valid_stack_address(Thread* thread, address sp) { 706 address stackStart = (address)thread->stack_base(); 707 address stackEnd = (address)(stackStart - (address)thread->stack_size()); 708 if (sp < stackStart && sp >= stackEnd) return true; 709 return false; 710 } 711 712 extern "C" void breakpoint() { 713 // use debugger to set breakpoint here 714 } 715 716 static thread_t main_thread; 717 718 // Thread start routine for all newly created threads 719 extern "C" void* thread_native_entry(void* thread_addr) { 720 // Try to randomize the cache line index of hot stack frames. 721 // This helps when threads of the same stack traces evict each other's 722 // cache lines. The threads can be either from the same JVM instance, or 723 // from different JVM instances. The benefit is especially true for 724 // processors with hyperthreading technology. 725 static int counter = 0; 726 int pid = os::current_process_id(); 727 alloca(((pid ^ counter++) & 7) * 128); 728 729 int prio; 730 Thread* thread = (Thread*)thread_addr; 731 732 thread->initialize_thread_current(); 733 734 OSThread* osthr = thread->osthread(); 735 736 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound 737 thread->_schedctl = (void *) schedctl_init(); 738 739 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", 740 os::current_thread_id()); 741 742 if (UseNUMA) { 743 int lgrp_id = os::numa_get_group_id(); 744 if (lgrp_id != -1) { 745 thread->set_lgrp_id(lgrp_id); 746 } 747 } 748 749 // Our priority was set when we were created, and stored in the 750 // osthread, but couldn't be passed through to our LWP until now. 751 // So read back the priority and set it again. 752 753 if (osthr->thread_id() != -1) { 754 if (UseThreadPriorities) { 755 int prio = osthr->native_priority(); 756 if (ThreadPriorityVerbose) { 757 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " 758 INTPTR_FORMAT ", setting priority: %d\n", 759 osthr->thread_id(), osthr->lwp_id(), prio); 760 } 761 os::set_native_priority(thread, prio); 762 } 763 } else if (ThreadPriorityVerbose) { 764 warning("Can't set priority in _start routine, thread id hasn't been set\n"); 765 } 766 767 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 768 769 // initialize signal mask for this thread 770 os::Solaris::hotspot_sigmask(thread); 771 772 thread->run(); 773 774 // One less thread is executing 775 // When the VMThread gets here, the main thread may have already exited 776 // which frees the CodeHeap containing the Atomic::dec code 777 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 778 Atomic::dec(&os::Solaris::_os_thread_count); 779 } 780 781 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id()); 782 783 // If a thread has not deleted itself ("delete this") as part of its 784 // termination sequence, we have to ensure thread-local-storage is 785 // cleared before we actually terminate. No threads should ever be 786 // deleted asynchronously with respect to their termination. 787 if (Thread::current_or_null_safe() != NULL) { 788 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 789 thread->clear_thread_current(); 790 } 791 792 if (UseDetachedThreads) { 793 thr_exit(NULL); 794 ShouldNotReachHere(); 795 } 796 return NULL; 797 } 798 799 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) { 800 // Allocate the OSThread object 801 OSThread* osthread = new OSThread(NULL, NULL); 802 if (osthread == NULL) return NULL; 803 804 // Store info on the Solaris thread into the OSThread 805 osthread->set_thread_id(thread_id); 806 osthread->set_lwp_id(_lwp_self()); 807 thread->_schedctl = (void *) schedctl_init(); 808 809 if (UseNUMA) { 810 int lgrp_id = os::numa_get_group_id(); 811 if (lgrp_id != -1) { 812 thread->set_lgrp_id(lgrp_id); 813 } 814 } 815 816 if (ThreadPriorityVerbose) { 817 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n", 818 osthread->thread_id(), osthread->lwp_id()); 819 } 820 821 // Initial thread state is INITIALIZED, not SUSPENDED 822 osthread->set_state(INITIALIZED); 823 824 return osthread; 825 } 826 827 void os::Solaris::hotspot_sigmask(Thread* thread) { 828 //Save caller's signal mask 829 sigset_t sigmask; 830 pthread_sigmask(SIG_SETMASK, NULL, &sigmask); 831 OSThread *osthread = thread->osthread(); 832 osthread->set_caller_sigmask(sigmask); 833 834 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL); 835 if (!ReduceSignalUsage) { 836 if (thread->is_VM_thread()) { 837 // Only the VM thread handles BREAK_SIGNAL ... 838 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 839 } else { 840 // ... all other threads block BREAK_SIGNAL 841 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked"); 842 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 843 } 844 } 845 } 846 847 bool os::create_attached_thread(JavaThread* thread) { 848 #ifdef ASSERT 849 thread->verify_not_published(); 850 #endif 851 OSThread* osthread = create_os_thread(thread, thr_self()); 852 if (osthread == NULL) { 853 return false; 854 } 855 856 // Initial thread state is RUNNABLE 857 osthread->set_state(RUNNABLE); 858 thread->set_osthread(osthread); 859 860 // initialize signal mask for this thread 861 // and save the caller's signal mask 862 os::Solaris::hotspot_sigmask(thread); 863 864 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").", 865 os::current_thread_id()); 866 867 return true; 868 } 869 870 bool os::create_main_thread(JavaThread* thread) { 871 #ifdef ASSERT 872 thread->verify_not_published(); 873 #endif 874 if (_starting_thread == NULL) { 875 _starting_thread = create_os_thread(thread, main_thread); 876 if (_starting_thread == NULL) { 877 return false; 878 } 879 } 880 881 // The primodial thread is runnable from the start 882 _starting_thread->set_state(RUNNABLE); 883 884 thread->set_osthread(_starting_thread); 885 886 // initialize signal mask for this thread 887 // and save the caller's signal mask 888 os::Solaris::hotspot_sigmask(thread); 889 890 return true; 891 } 892 893 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr() 894 static char* describe_thr_create_attributes(char* buf, size_t buflen, 895 size_t stacksize, long flags) { 896 stringStream ss(buf, buflen); 897 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024); 898 ss.print("flags: "); 899 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " "); 900 #define ALL(X) \ 901 X(THR_SUSPENDED) \ 902 X(THR_DETACHED) \ 903 X(THR_BOUND) \ 904 X(THR_NEW_LWP) \ 905 X(THR_DAEMON) 906 ALL(PRINT_FLAG) 907 #undef ALL 908 #undef PRINT_FLAG 909 return buf; 910 } 911 912 // return default stack size for thr_type 913 size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 914 // default stack size when not specified by caller is 1M (2M for LP64) 915 size_t s = (BytesPerWord >> 2) * K * K; 916 return s; 917 } 918 919 bool os::create_thread(Thread* thread, ThreadType thr_type, 920 size_t req_stack_size) { 921 // Allocate the OSThread object 922 OSThread* osthread = new OSThread(NULL, NULL); 923 if (osthread == NULL) { 924 return false; 925 } 926 927 if (ThreadPriorityVerbose) { 928 char *thrtyp; 929 switch (thr_type) { 930 case vm_thread: 931 thrtyp = (char *)"vm"; 932 break; 933 case cgc_thread: 934 thrtyp = (char *)"cgc"; 935 break; 936 case pgc_thread: 937 thrtyp = (char *)"pgc"; 938 break; 939 case java_thread: 940 thrtyp = (char *)"java"; 941 break; 942 case compiler_thread: 943 thrtyp = (char *)"compiler"; 944 break; 945 case watcher_thread: 946 thrtyp = (char *)"watcher"; 947 break; 948 default: 949 thrtyp = (char *)"unknown"; 950 break; 951 } 952 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp); 953 } 954 955 // calculate stack size if it's not specified by caller 956 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 957 958 // Initial state is ALLOCATED but not INITIALIZED 959 osthread->set_state(ALLOCATED); 960 961 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) { 962 // We got lots of threads. Check if we still have some address space left. 963 // Need to be at least 5Mb of unreserved address space. We do check by 964 // trying to reserve some. 965 const size_t VirtualMemoryBangSize = 20*K*K; 966 char* mem = os::reserve_memory(VirtualMemoryBangSize); 967 if (mem == NULL) { 968 delete osthread; 969 return false; 970 } else { 971 // Release the memory again 972 os::release_memory(mem, VirtualMemoryBangSize); 973 } 974 } 975 976 // Setup osthread because the child thread may need it. 977 thread->set_osthread(osthread); 978 979 // Create the Solaris thread 980 thread_t tid = 0; 981 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED; 982 int status; 983 984 // Mark that we don't have an lwp or thread id yet. 985 // In case we attempt to set the priority before the thread starts. 986 osthread->set_lwp_id(-1); 987 osthread->set_thread_id(-1); 988 989 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid); 990 991 char buf[64]; 992 if (status == 0) { 993 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ", 994 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 995 } else { 996 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.", 997 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 998 } 999 1000 if (status != 0) { 1001 thread->set_osthread(NULL); 1002 // Need to clean up stuff we've allocated so far 1003 delete osthread; 1004 return false; 1005 } 1006 1007 Atomic::inc(&os::Solaris::_os_thread_count); 1008 1009 // Store info on the Solaris thread into the OSThread 1010 osthread->set_thread_id(tid); 1011 1012 // Remember that we created this thread so we can set priority on it 1013 osthread->set_vm_created(); 1014 1015 // Most thread types will set an explicit priority before starting the thread, 1016 // but for those that don't we need a valid value to read back in thread_native_entry. 1017 osthread->set_native_priority(NormPriority); 1018 1019 // Initial thread state is INITIALIZED, not SUSPENDED 1020 osthread->set_state(INITIALIZED); 1021 1022 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 1023 return true; 1024 } 1025 1026 debug_only(static bool signal_sets_initialized = false); 1027 static sigset_t unblocked_sigs, vm_sigs; 1028 1029 bool os::Solaris::is_sig_ignored(int sig) { 1030 struct sigaction oact; 1031 sigaction(sig, (struct sigaction*)NULL, &oact); 1032 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 1033 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 1034 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) { 1035 return true; 1036 } else { 1037 return false; 1038 } 1039 } 1040 1041 void os::Solaris::signal_sets_init() { 1042 // Should also have an assertion stating we are still single-threaded. 1043 assert(!signal_sets_initialized, "Already initialized"); 1044 // Fill in signals that are necessarily unblocked for all threads in 1045 // the VM. Currently, we unblock the following signals: 1046 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 1047 // by -Xrs (=ReduceSignalUsage)); 1048 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 1049 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 1050 // the dispositions or masks wrt these signals. 1051 // Programs embedding the VM that want to use the above signals for their 1052 // own purposes must, at this time, use the "-Xrs" option to prevent 1053 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 1054 // (See bug 4345157, and other related bugs). 1055 // In reality, though, unblocking these signals is really a nop, since 1056 // these signals are not blocked by default. 1057 sigemptyset(&unblocked_sigs); 1058 sigaddset(&unblocked_sigs, SIGILL); 1059 sigaddset(&unblocked_sigs, SIGSEGV); 1060 sigaddset(&unblocked_sigs, SIGBUS); 1061 sigaddset(&unblocked_sigs, SIGFPE); 1062 sigaddset(&unblocked_sigs, ASYNC_SIGNAL); 1063 1064 if (!ReduceSignalUsage) { 1065 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 1066 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 1067 } 1068 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 1069 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 1070 } 1071 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 1072 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 1073 } 1074 } 1075 // Fill in signals that are blocked by all but the VM thread. 1076 sigemptyset(&vm_sigs); 1077 if (!ReduceSignalUsage) { 1078 sigaddset(&vm_sigs, BREAK_SIGNAL); 1079 } 1080 debug_only(signal_sets_initialized = true); 1081 1082 // For diagnostics only used in run_periodic_checks 1083 sigemptyset(&check_signal_done); 1084 } 1085 1086 // These are signals that are unblocked while a thread is running Java. 1087 // (For some reason, they get blocked by default.) 1088 sigset_t* os::Solaris::unblocked_signals() { 1089 assert(signal_sets_initialized, "Not initialized"); 1090 return &unblocked_sigs; 1091 } 1092 1093 // These are the signals that are blocked while a (non-VM) thread is 1094 // running Java. Only the VM thread handles these signals. 1095 sigset_t* os::Solaris::vm_signals() { 1096 assert(signal_sets_initialized, "Not initialized"); 1097 return &vm_sigs; 1098 } 1099 1100 void _handle_uncaught_cxx_exception() { 1101 VMError::report_and_die("An uncaught C++ exception"); 1102 } 1103 1104 1105 // First crack at OS-specific initialization, from inside the new thread. 1106 void os::initialize_thread(Thread* thr) { 1107 if (is_primordial_thread()) { 1108 JavaThread* jt = (JavaThread *)thr; 1109 assert(jt != NULL, "Sanity check"); 1110 size_t stack_size; 1111 address base = jt->stack_base(); 1112 if (Arguments::created_by_java_launcher()) { 1113 // Use 2MB to allow for Solaris 7 64 bit mode. 1114 stack_size = JavaThread::stack_size_at_create() == 0 1115 ? 2048*K : JavaThread::stack_size_at_create(); 1116 1117 // There are rare cases when we may have already used more than 1118 // the basic stack size allotment before this method is invoked. 1119 // Attempt to allow for a normally sized java_stack. 1120 size_t current_stack_offset = (size_t)(base - (address)&stack_size); 1121 stack_size += ReservedSpace::page_align_size_down(current_stack_offset); 1122 } else { 1123 // 6269555: If we were not created by a Java launcher, i.e. if we are 1124 // running embedded in a native application, treat the primordial thread 1125 // as much like a native attached thread as possible. This means using 1126 // the current stack size from thr_stksegment(), unless it is too large 1127 // to reliably setup guard pages. A reasonable max size is 8MB. 1128 size_t current_size = current_stack_size(); 1129 // This should never happen, but just in case.... 1130 if (current_size == 0) current_size = 2 * K * K; 1131 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size; 1132 } 1133 address bottom = align_up(base - stack_size, os::vm_page_size());; 1134 stack_size = (size_t)(base - bottom); 1135 1136 assert(stack_size > 0, "Stack size calculation problem"); 1137 1138 if (stack_size > jt->stack_size()) { 1139 #ifndef PRODUCT 1140 struct rlimit limits; 1141 getrlimit(RLIMIT_STACK, &limits); 1142 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur); 1143 assert(size >= jt->stack_size(), "Stack size problem in main thread"); 1144 #endif 1145 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n" 1146 "(Stack sizes are rounded up to a multiple of the system page size.)\n" 1147 "See limit(1) to increase the stack size limit.", 1148 stack_size / K, jt->stack_size() / K); 1149 vm_exit(1); 1150 } 1151 assert(jt->stack_size() >= stack_size, 1152 "Attempt to map more stack than was allocated"); 1153 jt->set_stack_size(stack_size); 1154 } 1155 1156 // With the T2 libthread (T1 is no longer supported) threads are always bound 1157 // and we use stackbanging in all cases. 1158 1159 os::Solaris::init_thread_fpu_state(); 1160 std::set_terminate(_handle_uncaught_cxx_exception); 1161 } 1162 1163 1164 1165 // Free Solaris resources related to the OSThread 1166 void os::free_thread(OSThread* osthread) { 1167 assert(osthread != NULL, "os::free_thread but osthread not set"); 1168 1169 // We are told to free resources of the argument thread, 1170 // but we can only really operate on the current thread. 1171 assert(Thread::current()->osthread() == osthread, 1172 "os::free_thread but not current thread"); 1173 1174 // Restore caller's signal mask 1175 sigset_t sigmask = osthread->caller_sigmask(); 1176 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 1177 1178 delete osthread; 1179 } 1180 1181 void os::pd_start_thread(Thread* thread) { 1182 int status = thr_continue(thread->osthread()->thread_id()); 1183 assert_status(status == 0, status, "thr_continue failed"); 1184 } 1185 1186 1187 intx os::current_thread_id() { 1188 return (intx)thr_self(); 1189 } 1190 1191 static pid_t _initial_pid = 0; 1192 1193 int os::current_process_id() { 1194 return (int)(_initial_pid ? _initial_pid : getpid()); 1195 } 1196 1197 // gethrtime() should be monotonic according to the documentation, 1198 // but some virtualized platforms are known to break this guarantee. 1199 // getTimeNanos() must be guaranteed not to move backwards, so we 1200 // are forced to add a check here. 1201 inline hrtime_t getTimeNanos() { 1202 const hrtime_t now = gethrtime(); 1203 const hrtime_t prev = max_hrtime; 1204 if (now <= prev) { 1205 return prev; // same or retrograde time; 1206 } 1207 const hrtime_t obsv = Atomic::cmpxchg(now, &max_hrtime, prev); 1208 assert(obsv >= prev, "invariant"); // Monotonicity 1209 // If the CAS succeeded then we're done and return "now". 1210 // If the CAS failed and the observed value "obsv" is >= now then 1211 // we should return "obsv". If the CAS failed and now > obsv > prv then 1212 // some other thread raced this thread and installed a new value, in which case 1213 // we could either (a) retry the entire operation, (b) retry trying to install now 1214 // or (c) just return obsv. We use (c). No loop is required although in some cases 1215 // we might discard a higher "now" value in deference to a slightly lower but freshly 1216 // installed obsv value. That's entirely benign -- it admits no new orderings compared 1217 // to (a) or (b) -- and greatly reduces coherence traffic. 1218 // We might also condition (c) on the magnitude of the delta between obsv and now. 1219 // Avoiding excessive CAS operations to hot RW locations is critical. 1220 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 1221 return (prev == obsv) ? now : obsv; 1222 } 1223 1224 // Time since start-up in seconds to a fine granularity. 1225 // Used by VMSelfDestructTimer and the MemProfiler. 1226 double os::elapsedTime() { 1227 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1228 } 1229 1230 jlong os::elapsed_counter() { 1231 return (jlong)(getTimeNanos() - first_hrtime); 1232 } 1233 1234 jlong os::elapsed_frequency() { 1235 return hrtime_hz; 1236 } 1237 1238 // Return the real, user, and system times in seconds from an 1239 // arbitrary fixed point in the past. 1240 bool os::getTimesSecs(double* process_real_time, 1241 double* process_user_time, 1242 double* process_system_time) { 1243 struct tms ticks; 1244 clock_t real_ticks = times(&ticks); 1245 1246 if (real_ticks == (clock_t) (-1)) { 1247 return false; 1248 } else { 1249 double ticks_per_second = (double) clock_tics_per_sec; 1250 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1251 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1252 // For consistency return the real time from getTimeNanos() 1253 // converted to seconds. 1254 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); 1255 1256 return true; 1257 } 1258 } 1259 1260 bool os::supports_vtime() { return true; } 1261 bool os::enable_vtime() { return false; } 1262 bool os::vtime_enabled() { return false; } 1263 1264 double os::elapsedVTime() { 1265 return (double)gethrvtime() / (double)hrtime_hz; 1266 } 1267 1268 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 1269 jlong os::javaTimeMillis() { 1270 timeval t; 1271 if (gettimeofday(&t, NULL) == -1) { 1272 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno)); 1273 } 1274 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; 1275 } 1276 1277 // Must return seconds+nanos since Jan 1 1970. This must use the same 1278 // time source as javaTimeMillis and can't use get_nsec_fromepoch as 1279 // we need better than 1ms accuracy 1280 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 1281 timeval t; 1282 if (gettimeofday(&t, NULL) == -1) { 1283 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno)); 1284 } 1285 seconds = jlong(t.tv_sec); 1286 nanos = jlong(t.tv_usec) * 1000; 1287 } 1288 1289 1290 jlong os::javaTimeNanos() { 1291 return (jlong)getTimeNanos(); 1292 } 1293 1294 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1295 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits 1296 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1297 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1298 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1299 } 1300 1301 char * os::local_time_string(char *buf, size_t buflen) { 1302 struct tm t; 1303 time_t long_time; 1304 time(&long_time); 1305 localtime_r(&long_time, &t); 1306 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1307 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1308 t.tm_hour, t.tm_min, t.tm_sec); 1309 return buf; 1310 } 1311 1312 // Note: os::shutdown() might be called very early during initialization, or 1313 // called from signal handler. Before adding something to os::shutdown(), make 1314 // sure it is async-safe and can handle partially initialized VM. 1315 void os::shutdown() { 1316 1317 // allow PerfMemory to attempt cleanup of any persistent resources 1318 perfMemory_exit(); 1319 1320 // needs to remove object in file system 1321 AttachListener::abort(); 1322 1323 // flush buffered output, finish log files 1324 ostream_abort(); 1325 1326 // Check for abort hook 1327 abort_hook_t abort_hook = Arguments::abort_hook(); 1328 if (abort_hook != NULL) { 1329 abort_hook(); 1330 } 1331 } 1332 1333 // Note: os::abort() might be called very early during initialization, or 1334 // called from signal handler. Before adding something to os::abort(), make 1335 // sure it is async-safe and can handle partially initialized VM. 1336 void os::abort(bool dump_core, void* siginfo, const void* context) { 1337 os::shutdown(); 1338 if (dump_core) { 1339 #ifndef PRODUCT 1340 fdStream out(defaultStream::output_fd()); 1341 out.print_raw("Current thread is "); 1342 char buf[16]; 1343 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1344 out.print_raw_cr(buf); 1345 out.print_raw_cr("Dumping core ..."); 1346 #endif 1347 ::abort(); // dump core (for debugging) 1348 } 1349 1350 ::exit(1); 1351 } 1352 1353 // Die immediately, no exit hook, no abort hook, no cleanup. 1354 void os::die() { 1355 ::abort(); // dump core (for debugging) 1356 } 1357 1358 // DLL functions 1359 1360 const char* os::dll_file_extension() { return ".so"; } 1361 1362 // This must be hard coded because it's the system's temporary 1363 // directory not the java application's temp directory, ala java.io.tmpdir. 1364 const char* os::get_temp_directory() { return "/tmp"; } 1365 1366 // check if addr is inside libjvm.so 1367 bool os::address_is_in_vm(address addr) { 1368 static address libjvm_base_addr; 1369 Dl_info dlinfo; 1370 1371 if (libjvm_base_addr == NULL) { 1372 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1373 libjvm_base_addr = (address)dlinfo.dli_fbase; 1374 } 1375 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1376 } 1377 1378 if (dladdr((void *)addr, &dlinfo) != 0) { 1379 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1380 } 1381 1382 return false; 1383 } 1384 1385 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int); 1386 static dladdr1_func_type dladdr1_func = NULL; 1387 1388 bool os::dll_address_to_function_name(address addr, char *buf, 1389 int buflen, int * offset, 1390 bool demangle) { 1391 // buf is not optional, but offset is optional 1392 assert(buf != NULL, "sanity check"); 1393 1394 Dl_info dlinfo; 1395 1396 // dladdr1_func was initialized in os::init() 1397 if (dladdr1_func != NULL) { 1398 // yes, we have dladdr1 1399 1400 // Support for dladdr1 is checked at runtime; it may be 1401 // available even if the vm is built on a machine that does 1402 // not have dladdr1 support. Make sure there is a value for 1403 // RTLD_DL_SYMENT. 1404 #ifndef RTLD_DL_SYMENT 1405 #define RTLD_DL_SYMENT 1 1406 #endif 1407 #ifdef _LP64 1408 Elf64_Sym * info; 1409 #else 1410 Elf32_Sym * info; 1411 #endif 1412 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1413 RTLD_DL_SYMENT) != 0) { 1414 // see if we have a matching symbol that covers our address 1415 if (dlinfo.dli_saddr != NULL && 1416 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) { 1417 if (dlinfo.dli_sname != NULL) { 1418 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1419 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1420 } 1421 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1422 return true; 1423 } 1424 } 1425 // no matching symbol so try for just file info 1426 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1427 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1428 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1429 return true; 1430 } 1431 } 1432 } 1433 buf[0] = '\0'; 1434 if (offset != NULL) *offset = -1; 1435 return false; 1436 } 1437 1438 // no, only dladdr is available 1439 if (dladdr((void *)addr, &dlinfo) != 0) { 1440 // see if we have a matching symbol 1441 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1442 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1443 jio_snprintf(buf, buflen, dlinfo.dli_sname); 1444 } 1445 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1446 return true; 1447 } 1448 // no matching symbol so try for just file info 1449 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1450 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1451 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1452 return true; 1453 } 1454 } 1455 } 1456 buf[0] = '\0'; 1457 if (offset != NULL) *offset = -1; 1458 return false; 1459 } 1460 1461 bool os::dll_address_to_library_name(address addr, char* buf, 1462 int buflen, int* offset) { 1463 // buf is not optional, but offset is optional 1464 assert(buf != NULL, "sanity check"); 1465 1466 Dl_info dlinfo; 1467 1468 if (dladdr((void*)addr, &dlinfo) != 0) { 1469 if (dlinfo.dli_fname != NULL) { 1470 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1471 } 1472 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1473 *offset = addr - (address)dlinfo.dli_fbase; 1474 } 1475 return true; 1476 } 1477 1478 buf[0] = '\0'; 1479 if (offset) *offset = -1; 1480 return false; 1481 } 1482 1483 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1484 Dl_info dli; 1485 // Sanity check? 1486 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 || 1487 dli.dli_fname == NULL) { 1488 return 1; 1489 } 1490 1491 void * handle = dlopen(dli.dli_fname, RTLD_LAZY); 1492 if (handle == NULL) { 1493 return 1; 1494 } 1495 1496 Link_map *map; 1497 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1498 if (map == NULL) { 1499 dlclose(handle); 1500 return 1; 1501 } 1502 1503 while (map->l_prev != NULL) { 1504 map = map->l_prev; 1505 } 1506 1507 while (map != NULL) { 1508 // Iterate through all map entries and call callback with fields of interest 1509 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1510 dlclose(handle); 1511 return 1; 1512 } 1513 map = map->l_next; 1514 } 1515 1516 dlclose(handle); 1517 return 0; 1518 } 1519 1520 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1521 outputStream * out = (outputStream *) param; 1522 out->print_cr(PTR_FORMAT " \t%s", base_address, name); 1523 return 0; 1524 } 1525 1526 void os::print_dll_info(outputStream * st) { 1527 st->print_cr("Dynamic libraries:"); st->flush(); 1528 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1529 st->print_cr("Error: Cannot print dynamic libraries."); 1530 } 1531 } 1532 1533 // Loads .dll/.so and 1534 // in case of error it checks if .dll/.so was built for the 1535 // same architecture as Hotspot is running on 1536 1537 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1538 void * result= ::dlopen(filename, RTLD_LAZY); 1539 if (result != NULL) { 1540 // Successful loading 1541 return result; 1542 } 1543 1544 Elf32_Ehdr elf_head; 1545 1546 // Read system error message into ebuf 1547 // It may or may not be overwritten below 1548 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1549 ebuf[ebuflen-1]='\0'; 1550 int diag_msg_max_length=ebuflen-strlen(ebuf); 1551 char* diag_msg_buf=ebuf+strlen(ebuf); 1552 1553 if (diag_msg_max_length==0) { 1554 // No more space in ebuf for additional diagnostics message 1555 return NULL; 1556 } 1557 1558 1559 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1560 1561 if (file_descriptor < 0) { 1562 // Can't open library, report dlerror() message 1563 return NULL; 1564 } 1565 1566 bool failed_to_read_elf_head= 1567 (sizeof(elf_head)!= 1568 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1569 1570 ::close(file_descriptor); 1571 if (failed_to_read_elf_head) { 1572 // file i/o error - report dlerror() msg 1573 return NULL; 1574 } 1575 1576 typedef struct { 1577 Elf32_Half code; // Actual value as defined in elf.h 1578 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1579 char elf_class; // 32 or 64 bit 1580 char endianess; // MSB or LSB 1581 char* name; // String representation 1582 } arch_t; 1583 1584 static const arch_t arch_array[]={ 1585 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1586 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1587 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1588 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1589 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1590 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1591 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1592 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1593 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1594 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"} 1595 }; 1596 1597 #if (defined IA32) 1598 static Elf32_Half running_arch_code=EM_386; 1599 #elif (defined AMD64) 1600 static Elf32_Half running_arch_code=EM_X86_64; 1601 #elif (defined IA64) 1602 static Elf32_Half running_arch_code=EM_IA_64; 1603 #elif (defined __sparc) && (defined _LP64) 1604 static Elf32_Half running_arch_code=EM_SPARCV9; 1605 #elif (defined __sparc) && (!defined _LP64) 1606 static Elf32_Half running_arch_code=EM_SPARC; 1607 #elif (defined __powerpc64__) 1608 static Elf32_Half running_arch_code=EM_PPC64; 1609 #elif (defined __powerpc__) 1610 static Elf32_Half running_arch_code=EM_PPC; 1611 #elif (defined ARM) 1612 static Elf32_Half running_arch_code=EM_ARM; 1613 #else 1614 #error Method os::dll_load requires that one of following is defined:\ 1615 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM 1616 #endif 1617 1618 // Identify compatability class for VM's architecture and library's architecture 1619 // Obtain string descriptions for architectures 1620 1621 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1622 int running_arch_index=-1; 1623 1624 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1625 if (running_arch_code == arch_array[i].code) { 1626 running_arch_index = i; 1627 } 1628 if (lib_arch.code == arch_array[i].code) { 1629 lib_arch.compat_class = arch_array[i].compat_class; 1630 lib_arch.name = arch_array[i].name; 1631 } 1632 } 1633 1634 assert(running_arch_index != -1, 1635 "Didn't find running architecture code (running_arch_code) in arch_array"); 1636 if (running_arch_index == -1) { 1637 // Even though running architecture detection failed 1638 // we may still continue with reporting dlerror() message 1639 return NULL; 1640 } 1641 1642 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1643 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1644 return NULL; 1645 } 1646 1647 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1648 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1649 return NULL; 1650 } 1651 1652 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1653 if (lib_arch.name!=NULL) { 1654 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1655 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1656 lib_arch.name, arch_array[running_arch_index].name); 1657 } else { 1658 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1659 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1660 lib_arch.code, 1661 arch_array[running_arch_index].name); 1662 } 1663 } 1664 1665 return NULL; 1666 } 1667 1668 void* os::dll_lookup(void* handle, const char* name) { 1669 return dlsym(handle, name); 1670 } 1671 1672 void* os::get_default_process_handle() { 1673 return (void*)::dlopen(NULL, RTLD_LAZY); 1674 } 1675 1676 int os::stat(const char *path, struct stat *sbuf) { 1677 char pathbuf[MAX_PATH]; 1678 if (strlen(path) > MAX_PATH - 1) { 1679 errno = ENAMETOOLONG; 1680 return -1; 1681 } 1682 os::native_path(strcpy(pathbuf, path)); 1683 return ::stat(pathbuf, sbuf); 1684 } 1685 1686 static inline time_t get_mtime(const char* filename) { 1687 struct stat st; 1688 int ret = os::stat(filename, &st); 1689 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 1690 return st.st_mtime; 1691 } 1692 1693 int os::compare_file_modified_times(const char* file1, const char* file2) { 1694 time_t t1 = get_mtime(file1); 1695 time_t t2 = get_mtime(file2); 1696 return t1 - t2; 1697 } 1698 1699 static bool _print_ascii_file(const char* filename, outputStream* st) { 1700 int fd = ::open(filename, O_RDONLY); 1701 if (fd == -1) { 1702 return false; 1703 } 1704 1705 char buf[32]; 1706 int bytes; 1707 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1708 st->print_raw(buf, bytes); 1709 } 1710 1711 ::close(fd); 1712 1713 return true; 1714 } 1715 1716 void os::print_os_info_brief(outputStream* st) { 1717 os::Solaris::print_distro_info(st); 1718 1719 os::Posix::print_uname_info(st); 1720 1721 os::Solaris::print_libversion_info(st); 1722 } 1723 1724 void os::print_os_info(outputStream* st) { 1725 st->print("OS:"); 1726 1727 os::Solaris::print_distro_info(st); 1728 1729 os::Posix::print_uname_info(st); 1730 1731 os::Solaris::print_libversion_info(st); 1732 1733 os::Posix::print_rlimit_info(st); 1734 1735 os::Posix::print_load_average(st); 1736 } 1737 1738 void os::Solaris::print_distro_info(outputStream* st) { 1739 if (!_print_ascii_file("/etc/release", st)) { 1740 st->print("Solaris"); 1741 } 1742 st->cr(); 1743 } 1744 1745 void os::get_summary_os_info(char* buf, size_t buflen) { 1746 strncpy(buf, "Solaris", buflen); // default to plain solaris 1747 FILE* fp = fopen("/etc/release", "r"); 1748 if (fp != NULL) { 1749 char tmp[256]; 1750 // Only get the first line and chop out everything but the os name. 1751 if (fgets(tmp, sizeof(tmp), fp)) { 1752 char* ptr = tmp; 1753 // skip past whitespace characters 1754 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++; 1755 if (*ptr != '\0') { 1756 char* nl = strchr(ptr, '\n'); 1757 if (nl != NULL) *nl = '\0'; 1758 strncpy(buf, ptr, buflen); 1759 } 1760 } 1761 fclose(fp); 1762 } 1763 } 1764 1765 void os::Solaris::print_libversion_info(outputStream* st) { 1766 st->print(" (T2 libthread)"); 1767 st->cr(); 1768 } 1769 1770 static bool check_addr0(outputStream* st) { 1771 jboolean status = false; 1772 const int read_chunk = 200; 1773 int ret = 0; 1774 int nmap = 0; 1775 int fd = ::open("/proc/self/map",O_RDONLY); 1776 if (fd >= 0) { 1777 prmap_t *p = NULL; 1778 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t)); 1779 if (NULL == mbuff) { 1780 ::close(fd); 1781 return status; 1782 } 1783 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) { 1784 //check if read() has not read partial data 1785 if( 0 != ret % sizeof(prmap_t)){ 1786 break; 1787 } 1788 nmap = ret / sizeof(prmap_t); 1789 p = (prmap_t *)mbuff; 1790 for(int i = 0; i < nmap; i++){ 1791 if (p->pr_vaddr == 0x0) { 1792 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024); 1793 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname); 1794 st->print("Access: "); 1795 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-"); 1796 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-"); 1797 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-"); 1798 st->cr(); 1799 status = true; 1800 } 1801 p++; 1802 } 1803 } 1804 free(mbuff); 1805 ::close(fd); 1806 } 1807 return status; 1808 } 1809 1810 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1811 // Get MHz with system call. We don't seem to already have this. 1812 processor_info_t stats; 1813 processorid_t id = getcpuid(); 1814 int clock = 0; 1815 if (processor_info(id, &stats) != -1) { 1816 clock = stats.pi_clock; // pi_processor_type isn't more informative than below 1817 } 1818 #ifdef AMD64 1819 snprintf(buf, buflen, "x86 64 bit %d MHz", clock); 1820 #else 1821 // must be sparc 1822 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock); 1823 #endif 1824 } 1825 1826 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1827 // Nothing to do for now. 1828 } 1829 1830 void os::print_memory_info(outputStream* st) { 1831 st->print("Memory:"); 1832 st->print(" %dk page", os::vm_page_size()>>10); 1833 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 1834 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 1835 st->cr(); 1836 (void) check_addr0(st); 1837 } 1838 1839 // Moved from whole group, because we need them here for diagnostic 1840 // prints. 1841 static int Maxsignum = 0; 1842 static int *ourSigFlags = NULL; 1843 1844 int os::Solaris::get_our_sigflags(int sig) { 1845 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1846 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1847 return ourSigFlags[sig]; 1848 } 1849 1850 void os::Solaris::set_our_sigflags(int sig, int flags) { 1851 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1852 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1853 ourSigFlags[sig] = flags; 1854 } 1855 1856 1857 static const char* get_signal_handler_name(address handler, 1858 char* buf, int buflen) { 1859 int offset; 1860 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 1861 if (found) { 1862 // skip directory names 1863 const char *p1, *p2; 1864 p1 = buf; 1865 size_t len = strlen(os::file_separator()); 1866 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 1867 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 1868 } else { 1869 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 1870 } 1871 return buf; 1872 } 1873 1874 static void print_signal_handler(outputStream* st, int sig, 1875 char* buf, size_t buflen) { 1876 struct sigaction sa; 1877 1878 sigaction(sig, NULL, &sa); 1879 1880 st->print("%s: ", os::exception_name(sig, buf, buflen)); 1881 1882 address handler = (sa.sa_flags & SA_SIGINFO) 1883 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 1884 : CAST_FROM_FN_PTR(address, sa.sa_handler); 1885 1886 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 1887 st->print("SIG_DFL"); 1888 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 1889 st->print("SIG_IGN"); 1890 } else { 1891 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 1892 } 1893 1894 st->print(", sa_mask[0]="); 1895 os::Posix::print_signal_set_short(st, &sa.sa_mask); 1896 1897 address rh = VMError::get_resetted_sighandler(sig); 1898 // May be, handler was resetted by VMError? 1899 if (rh != NULL) { 1900 handler = rh; 1901 sa.sa_flags = VMError::get_resetted_sigflags(sig); 1902 } 1903 1904 st->print(", sa_flags="); 1905 os::Posix::print_sa_flags(st, sa.sa_flags); 1906 1907 // Check: is it our handler? 1908 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) { 1909 // It is our signal handler 1910 // check for flags 1911 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 1912 st->print( 1913 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 1914 os::Solaris::get_our_sigflags(sig)); 1915 } 1916 } 1917 st->cr(); 1918 } 1919 1920 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1921 st->print_cr("Signal Handlers:"); 1922 print_signal_handler(st, SIGSEGV, buf, buflen); 1923 print_signal_handler(st, SIGBUS , buf, buflen); 1924 print_signal_handler(st, SIGFPE , buf, buflen); 1925 print_signal_handler(st, SIGPIPE, buf, buflen); 1926 print_signal_handler(st, SIGXFSZ, buf, buflen); 1927 print_signal_handler(st, SIGILL , buf, buflen); 1928 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 1929 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1930 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 1931 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1932 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 1933 } 1934 1935 static char saved_jvm_path[MAXPATHLEN] = { 0 }; 1936 1937 // Find the full path to the current module, libjvm.so 1938 void os::jvm_path(char *buf, jint buflen) { 1939 // Error checking. 1940 if (buflen < MAXPATHLEN) { 1941 assert(false, "must use a large-enough buffer"); 1942 buf[0] = '\0'; 1943 return; 1944 } 1945 // Lazy resolve the path to current module. 1946 if (saved_jvm_path[0] != 0) { 1947 strcpy(buf, saved_jvm_path); 1948 return; 1949 } 1950 1951 Dl_info dlinfo; 1952 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 1953 assert(ret != 0, "cannot locate libjvm"); 1954 if (ret != 0 && dlinfo.dli_fname != NULL) { 1955 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) { 1956 return; 1957 } 1958 } else { 1959 buf[0] = '\0'; 1960 return; 1961 } 1962 1963 if (Arguments::sun_java_launcher_is_altjvm()) { 1964 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1965 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". 1966 // If "/jre/lib/" appears at the right place in the string, then 1967 // assume we are installed in a JDK and we're done. Otherwise, check 1968 // for a JAVA_HOME environment variable and fix up the path so it 1969 // looks like libjvm.so is installed there (append a fake suffix 1970 // hotspot/libjvm.so). 1971 const char *p = buf + strlen(buf) - 1; 1972 for (int count = 0; p > buf && count < 5; ++count) { 1973 for (--p; p > buf && *p != '/'; --p) 1974 /* empty */ ; 1975 } 1976 1977 if (strncmp(p, "/jre/lib/", 9) != 0) { 1978 // Look for JAVA_HOME in the environment. 1979 char* java_home_var = ::getenv("JAVA_HOME"); 1980 if (java_home_var != NULL && java_home_var[0] != 0) { 1981 char* jrelib_p; 1982 int len; 1983 1984 // Check the current module name "libjvm.so". 1985 p = strrchr(buf, '/'); 1986 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1987 1988 if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) { 1989 return; 1990 } 1991 // determine if this is a legacy image or modules image 1992 // modules image doesn't have "jre" subdirectory 1993 len = strlen(buf); 1994 assert(len < buflen, "Ran out of buffer space"); 1995 jrelib_p = buf + len; 1996 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1997 if (0 != access(buf, F_OK)) { 1998 snprintf(jrelib_p, buflen-len, "/lib"); 1999 } 2000 2001 if (0 == access(buf, F_OK)) { 2002 // Use current module name "libjvm.so" 2003 len = strlen(buf); 2004 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 2005 } else { 2006 // Go back to path of .so 2007 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) { 2008 return; 2009 } 2010 } 2011 } 2012 } 2013 } 2014 2015 strncpy(saved_jvm_path, buf, MAXPATHLEN); 2016 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 2017 } 2018 2019 2020 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2021 // no prefix required, not even "_" 2022 } 2023 2024 2025 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2026 // no suffix required 2027 } 2028 2029 // This method is a copy of JDK's sysGetLastErrorString 2030 // from src/solaris/hpi/src/system_md.c 2031 2032 size_t os::lasterror(char *buf, size_t len) { 2033 if (errno == 0) return 0; 2034 2035 const char *s = os::strerror(errno); 2036 size_t n = ::strlen(s); 2037 if (n >= len) { 2038 n = len - 1; 2039 } 2040 ::strncpy(buf, s, n); 2041 buf[n] = '\0'; 2042 return n; 2043 } 2044 2045 2046 // sun.misc.Signal 2047 2048 extern "C" { 2049 static void UserHandler(int sig, void *siginfo, void *context) { 2050 // Ctrl-C is pressed during error reporting, likely because the error 2051 // handler fails to abort. Let VM die immediately. 2052 if (sig == SIGINT && VMError::is_error_reported()) { 2053 os::die(); 2054 } 2055 2056 os::signal_notify(sig); 2057 // We do not need to reinstate the signal handler each time... 2058 } 2059 } 2060 2061 void* os::user_handler() { 2062 return CAST_FROM_FN_PTR(void*, UserHandler); 2063 } 2064 2065 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) { 2066 struct timespec ts; 2067 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 2068 2069 return ts; 2070 } 2071 2072 extern "C" { 2073 typedef void (*sa_handler_t)(int); 2074 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2075 } 2076 2077 void* os::signal(int signal_number, void* handler) { 2078 struct sigaction sigAct, oldSigAct; 2079 sigfillset(&(sigAct.sa_mask)); 2080 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 2081 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2082 2083 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 2084 // -1 means registration failed 2085 return (void *)-1; 2086 } 2087 2088 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2089 } 2090 2091 void os::signal_raise(int signal_number) { 2092 raise(signal_number); 2093 } 2094 2095 // The following code is moved from os.cpp for making this 2096 // code platform specific, which it is by its very nature. 2097 2098 // a counter for each possible signal value 2099 static int Sigexit = 0; 2100 static jint *pending_signals = NULL; 2101 static int *preinstalled_sigs = NULL; 2102 static struct sigaction *chainedsigactions = NULL; 2103 static sema_t sig_sem; 2104 typedef int (*version_getting_t)(); 2105 version_getting_t os::Solaris::get_libjsig_version = NULL; 2106 2107 int os::sigexitnum_pd() { 2108 assert(Sigexit > 0, "signal memory not yet initialized"); 2109 return Sigexit; 2110 } 2111 2112 void os::Solaris::init_signal_mem() { 2113 // Initialize signal structures 2114 Maxsignum = SIGRTMAX; 2115 Sigexit = Maxsignum+1; 2116 assert(Maxsignum >0, "Unable to obtain max signal number"); 2117 2118 // pending_signals has one int per signal 2119 // The additional signal is for SIGEXIT - exit signal to signal_thread 2120 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); 2121 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 2122 2123 if (UseSignalChaining) { 2124 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 2125 * (Maxsignum + 1), mtInternal); 2126 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 2127 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2128 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 2129 } 2130 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2131 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 2132 } 2133 2134 void os::signal_init_pd() { 2135 int ret; 2136 2137 ret = ::sema_init(&sig_sem, 0, NULL, NULL); 2138 assert(ret == 0, "sema_init() failed"); 2139 } 2140 2141 void os::signal_notify(int signal_number) { 2142 int ret; 2143 2144 Atomic::inc(&pending_signals[signal_number]); 2145 ret = ::sema_post(&sig_sem); 2146 assert(ret == 0, "sema_post() failed"); 2147 } 2148 2149 static int check_pending_signals(bool wait_for_signal) { 2150 int ret; 2151 while (true) { 2152 for (int i = 0; i < Sigexit + 1; i++) { 2153 jint n = pending_signals[i]; 2154 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2155 return i; 2156 } 2157 } 2158 if (!wait_for_signal) { 2159 return -1; 2160 } 2161 JavaThread *thread = JavaThread::current(); 2162 ThreadBlockInVM tbivm(thread); 2163 2164 bool threadIsSuspended; 2165 do { 2166 thread->set_suspend_equivalent(); 2167 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2168 while ((ret = ::sema_wait(&sig_sem)) == EINTR) 2169 ; 2170 assert(ret == 0, "sema_wait() failed"); 2171 2172 // were we externally suspended while we were waiting? 2173 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2174 if (threadIsSuspended) { 2175 // The semaphore has been incremented, but while we were waiting 2176 // another thread suspended us. We don't want to continue running 2177 // while suspended because that would surprise the thread that 2178 // suspended us. 2179 ret = ::sema_post(&sig_sem); 2180 assert(ret == 0, "sema_post() failed"); 2181 2182 thread->java_suspend_self(); 2183 } 2184 } while (threadIsSuspended); 2185 } 2186 } 2187 2188 int os::signal_lookup() { 2189 return check_pending_signals(false); 2190 } 2191 2192 int os::signal_wait() { 2193 return check_pending_signals(true); 2194 } 2195 2196 //////////////////////////////////////////////////////////////////////////////// 2197 // Virtual Memory 2198 2199 static int page_size = -1; 2200 2201 int os::vm_page_size() { 2202 assert(page_size != -1, "must call os::init"); 2203 return page_size; 2204 } 2205 2206 // Solaris allocates memory by pages. 2207 int os::vm_allocation_granularity() { 2208 assert(page_size != -1, "must call os::init"); 2209 return page_size; 2210 } 2211 2212 static bool recoverable_mmap_error(int err) { 2213 // See if the error is one we can let the caller handle. This 2214 // list of errno values comes from the Solaris mmap(2) man page. 2215 switch (err) { 2216 case EBADF: 2217 case EINVAL: 2218 case ENOTSUP: 2219 // let the caller deal with these errors 2220 return true; 2221 2222 default: 2223 // Any remaining errors on this OS can cause our reserved mapping 2224 // to be lost. That can cause confusion where different data 2225 // structures think they have the same memory mapped. The worst 2226 // scenario is if both the VM and a library think they have the 2227 // same memory mapped. 2228 return false; 2229 } 2230 } 2231 2232 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec, 2233 int err) { 2234 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2235 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec, 2236 os::strerror(err), err); 2237 } 2238 2239 static void warn_fail_commit_memory(char* addr, size_t bytes, 2240 size_t alignment_hint, bool exec, 2241 int err) { 2242 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2243 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes, 2244 alignment_hint, exec, os::strerror(err), err); 2245 } 2246 2247 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) { 2248 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2249 size_t size = bytes; 2250 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2251 if (res != NULL) { 2252 if (UseNUMAInterleaving) { 2253 numa_make_global(addr, bytes); 2254 } 2255 return 0; 2256 } 2257 2258 int err = errno; // save errno from mmap() call in mmap_chunk() 2259 2260 if (!recoverable_mmap_error(err)) { 2261 warn_fail_commit_memory(addr, bytes, exec, err); 2262 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory."); 2263 } 2264 2265 return err; 2266 } 2267 2268 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 2269 return Solaris::commit_memory_impl(addr, bytes, exec) == 0; 2270 } 2271 2272 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec, 2273 const char* mesg) { 2274 assert(mesg != NULL, "mesg must be specified"); 2275 int err = os::Solaris::commit_memory_impl(addr, bytes, exec); 2276 if (err != 0) { 2277 // the caller wants all commit errors to exit with the specified mesg: 2278 warn_fail_commit_memory(addr, bytes, exec, err); 2279 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2280 } 2281 } 2282 2283 size_t os::Solaris::page_size_for_alignment(size_t alignment) { 2284 assert(is_aligned(alignment, (size_t) vm_page_size()), 2285 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, 2286 alignment, (size_t) vm_page_size()); 2287 2288 for (int i = 0; _page_sizes[i] != 0; i++) { 2289 if (is_aligned(alignment, _page_sizes[i])) { 2290 return _page_sizes[i]; 2291 } 2292 } 2293 2294 return (size_t) vm_page_size(); 2295 } 2296 2297 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, 2298 size_t alignment_hint, bool exec) { 2299 int err = Solaris::commit_memory_impl(addr, bytes, exec); 2300 if (err == 0 && UseLargePages && alignment_hint > 0) { 2301 assert(is_aligned(bytes, alignment_hint), 2302 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint); 2303 2304 // The syscall memcntl requires an exact page size (see man memcntl for details). 2305 size_t page_size = page_size_for_alignment(alignment_hint); 2306 if (page_size > (size_t) vm_page_size()) { 2307 (void)Solaris::setup_large_pages(addr, bytes, page_size); 2308 } 2309 } 2310 return err; 2311 } 2312 2313 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2314 bool exec) { 2315 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0; 2316 } 2317 2318 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, 2319 size_t alignment_hint, bool exec, 2320 const char* mesg) { 2321 assert(mesg != NULL, "mesg must be specified"); 2322 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec); 2323 if (err != 0) { 2324 // the caller wants all commit errors to exit with the specified mesg: 2325 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err); 2326 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2327 } 2328 } 2329 2330 // Uncommit the pages in a specified region. 2331 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { 2332 if (madvise(addr, bytes, MADV_FREE) < 0) { 2333 debug_only(warning("MADV_FREE failed.")); 2334 return; 2335 } 2336 } 2337 2338 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2339 return os::commit_memory(addr, size, !ExecMem); 2340 } 2341 2342 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2343 return os::uncommit_memory(addr, size); 2344 } 2345 2346 // Change the page size in a given range. 2347 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2348 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2349 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2350 if (UseLargePages) { 2351 size_t page_size = Solaris::page_size_for_alignment(alignment_hint); 2352 if (page_size > (size_t) vm_page_size()) { 2353 Solaris::setup_large_pages(addr, bytes, page_size); 2354 } 2355 } 2356 } 2357 2358 // Tell the OS to make the range local to the first-touching LWP 2359 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2360 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2361 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2362 debug_only(warning("MADV_ACCESS_LWP failed.")); 2363 } 2364 } 2365 2366 // Tell the OS that this range would be accessed from different LWPs. 2367 void os::numa_make_global(char *addr, size_t bytes) { 2368 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2369 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2370 debug_only(warning("MADV_ACCESS_MANY failed.")); 2371 } 2372 } 2373 2374 // Get the number of the locality groups. 2375 size_t os::numa_get_groups_num() { 2376 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2377 return n != -1 ? n : 1; 2378 } 2379 2380 // Get a list of leaf locality groups. A leaf lgroup is group that 2381 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2382 // board. An LWP is assigned to one of these groups upon creation. 2383 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2384 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2385 ids[0] = 0; 2386 return 1; 2387 } 2388 int result_size = 0, top = 1, bottom = 0, cur = 0; 2389 for (int k = 0; k < size; k++) { 2390 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2391 (Solaris::lgrp_id_t*)&ids[top], size - top); 2392 if (r == -1) { 2393 ids[0] = 0; 2394 return 1; 2395 } 2396 if (!r) { 2397 // That's a leaf node. 2398 assert(bottom <= cur, "Sanity check"); 2399 // Check if the node has memory 2400 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2401 NULL, 0, LGRP_RSRC_MEM) > 0) { 2402 ids[bottom++] = ids[cur]; 2403 } 2404 } 2405 top += r; 2406 cur++; 2407 } 2408 if (bottom == 0) { 2409 // Handle a situation, when the OS reports no memory available. 2410 // Assume UMA architecture. 2411 ids[0] = 0; 2412 return 1; 2413 } 2414 return bottom; 2415 } 2416 2417 // Detect the topology change. Typically happens during CPU plugging-unplugging. 2418 bool os::numa_topology_changed() { 2419 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2420 if (is_stale != -1 && is_stale) { 2421 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2422 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2423 assert(c != 0, "Failure to initialize LGRP API"); 2424 Solaris::set_lgrp_cookie(c); 2425 return true; 2426 } 2427 return false; 2428 } 2429 2430 // Get the group id of the current LWP. 2431 int os::numa_get_group_id() { 2432 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2433 if (lgrp_id == -1) { 2434 return 0; 2435 } 2436 const int size = os::numa_get_groups_num(); 2437 int *ids = (int*)alloca(size * sizeof(int)); 2438 2439 // Get the ids of all lgroups with memory; r is the count. 2440 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2441 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2442 if (r <= 0) { 2443 return 0; 2444 } 2445 return ids[os::random() % r]; 2446 } 2447 2448 // Request information about the page. 2449 bool os::get_page_info(char *start, page_info* info) { 2450 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2451 uint64_t addr = (uintptr_t)start; 2452 uint64_t outdata[2]; 2453 uint_t validity = 0; 2454 2455 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2456 return false; 2457 } 2458 2459 info->size = 0; 2460 info->lgrp_id = -1; 2461 2462 if ((validity & 1) != 0) { 2463 if ((validity & 2) != 0) { 2464 info->lgrp_id = outdata[0]; 2465 } 2466 if ((validity & 4) != 0) { 2467 info->size = outdata[1]; 2468 } 2469 return true; 2470 } 2471 return false; 2472 } 2473 2474 // Scan the pages from start to end until a page different than 2475 // the one described in the info parameter is encountered. 2476 char *os::scan_pages(char *start, char* end, page_info* page_expected, 2477 page_info* page_found) { 2478 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2479 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2480 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1]; 2481 uint_t validity[MAX_MEMINFO_CNT]; 2482 2483 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2484 uint64_t p = (uint64_t)start; 2485 while (p < (uint64_t)end) { 2486 addrs[0] = p; 2487 size_t addrs_count = 1; 2488 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { 2489 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2490 addrs_count++; 2491 } 2492 2493 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2494 return NULL; 2495 } 2496 2497 size_t i = 0; 2498 for (; i < addrs_count; i++) { 2499 if ((validity[i] & 1) != 0) { 2500 if ((validity[i] & 4) != 0) { 2501 if (outdata[types * i + 1] != page_expected->size) { 2502 break; 2503 } 2504 } else if (page_expected->size != 0) { 2505 break; 2506 } 2507 2508 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2509 if (outdata[types * i] != page_expected->lgrp_id) { 2510 break; 2511 } 2512 } 2513 } else { 2514 return NULL; 2515 } 2516 } 2517 2518 if (i < addrs_count) { 2519 if ((validity[i] & 2) != 0) { 2520 page_found->lgrp_id = outdata[types * i]; 2521 } else { 2522 page_found->lgrp_id = -1; 2523 } 2524 if ((validity[i] & 4) != 0) { 2525 page_found->size = outdata[types * i + 1]; 2526 } else { 2527 page_found->size = 0; 2528 } 2529 return (char*)addrs[i]; 2530 } 2531 2532 p = addrs[addrs_count - 1] + page_size; 2533 } 2534 return end; 2535 } 2536 2537 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 2538 size_t size = bytes; 2539 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2540 // uncommitted page. Otherwise, the read/write might succeed if we 2541 // have enough swap space to back the physical page. 2542 return 2543 NULL != Solaris::mmap_chunk(addr, size, 2544 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2545 PROT_NONE); 2546 } 2547 2548 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2549 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2550 2551 if (b == MAP_FAILED) { 2552 return NULL; 2553 } 2554 return b; 2555 } 2556 2557 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, 2558 size_t alignment_hint, bool fixed) { 2559 char* addr = requested_addr; 2560 int flags = MAP_PRIVATE | MAP_NORESERVE; 2561 2562 assert(!(fixed && (alignment_hint > 0)), 2563 "alignment hint meaningless with fixed mmap"); 2564 2565 if (fixed) { 2566 flags |= MAP_FIXED; 2567 } else if (alignment_hint > (size_t) vm_page_size()) { 2568 flags |= MAP_ALIGN; 2569 addr = (char*) alignment_hint; 2570 } 2571 2572 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2573 // uncommitted page. Otherwise, the read/write might succeed if we 2574 // have enough swap space to back the physical page. 2575 return mmap_chunk(addr, bytes, flags, PROT_NONE); 2576 } 2577 2578 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2579 size_t alignment_hint) { 2580 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, 2581 (requested_addr != NULL)); 2582 2583 guarantee(requested_addr == NULL || requested_addr == addr, 2584 "OS failed to return requested mmap address."); 2585 return addr; 2586 } 2587 2588 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) { 2589 assert(file_desc >= 0, "file_desc is not valid"); 2590 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr); 2591 if (result != NULL) { 2592 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) { 2593 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory")); 2594 } 2595 } 2596 return result; 2597 } 2598 2599 // Reserve memory at an arbitrary address, only if that area is 2600 // available (and not reserved for something else). 2601 2602 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2603 const int max_tries = 10; 2604 char* base[max_tries]; 2605 size_t size[max_tries]; 2606 2607 // Solaris adds a gap between mmap'ed regions. The size of the gap 2608 // is dependent on the requested size and the MMU. Our initial gap 2609 // value here is just a guess and will be corrected later. 2610 bool had_top_overlap = false; 2611 bool have_adjusted_gap = false; 2612 size_t gap = 0x400000; 2613 2614 // Assert only that the size is a multiple of the page size, since 2615 // that's all that mmap requires, and since that's all we really know 2616 // about at this low abstraction level. If we need higher alignment, 2617 // we can either pass an alignment to this method or verify alignment 2618 // in one of the methods further up the call chain. See bug 5044738. 2619 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2620 2621 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 2622 // Give it a try, if the kernel honors the hint we can return immediately. 2623 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 2624 2625 volatile int err = errno; 2626 if (addr == requested_addr) { 2627 return addr; 2628 } else if (addr != NULL) { 2629 pd_unmap_memory(addr, bytes); 2630 } 2631 2632 if (log_is_enabled(Warning, os)) { 2633 char buf[256]; 2634 buf[0] = '\0'; 2635 if (addr == NULL) { 2636 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err)); 2637 } 2638 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at " 2639 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT 2640 "%s", bytes, requested_addr, addr, buf); 2641 } 2642 2643 // Address hint method didn't work. Fall back to the old method. 2644 // In theory, once SNV becomes our oldest supported platform, this 2645 // code will no longer be needed. 2646 // 2647 // Repeatedly allocate blocks until the block is allocated at the 2648 // right spot. Give up after max_tries. 2649 int i; 2650 for (i = 0; i < max_tries; ++i) { 2651 base[i] = reserve_memory(bytes); 2652 2653 if (base[i] != NULL) { 2654 // Is this the block we wanted? 2655 if (base[i] == requested_addr) { 2656 size[i] = bytes; 2657 break; 2658 } 2659 2660 // check that the gap value is right 2661 if (had_top_overlap && !have_adjusted_gap) { 2662 size_t actual_gap = base[i-1] - base[i] - bytes; 2663 if (gap != actual_gap) { 2664 // adjust the gap value and retry the last 2 allocations 2665 assert(i > 0, "gap adjustment code problem"); 2666 have_adjusted_gap = true; // adjust the gap only once, just in case 2667 gap = actual_gap; 2668 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap); 2669 unmap_memory(base[i], bytes); 2670 unmap_memory(base[i-1], size[i-1]); 2671 i-=2; 2672 continue; 2673 } 2674 } 2675 2676 // Does this overlap the block we wanted? Give back the overlapped 2677 // parts and try again. 2678 // 2679 // There is still a bug in this code: if top_overlap == bytes, 2680 // the overlap is offset from requested region by the value of gap. 2681 // In this case giving back the overlapped part will not work, 2682 // because we'll give back the entire block at base[i] and 2683 // therefore the subsequent allocation will not generate a new gap. 2684 // This could be fixed with a new algorithm that used larger 2685 // or variable size chunks to find the requested region - 2686 // but such a change would introduce additional complications. 2687 // It's rare enough that the planets align for this bug, 2688 // so we'll just wait for a fix for 6204603/5003415 which 2689 // will provide a mmap flag to allow us to avoid this business. 2690 2691 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2692 if (top_overlap >= 0 && top_overlap < bytes) { 2693 had_top_overlap = true; 2694 unmap_memory(base[i], top_overlap); 2695 base[i] += top_overlap; 2696 size[i] = bytes - top_overlap; 2697 } else { 2698 size_t bottom_overlap = base[i] + bytes - requested_addr; 2699 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2700 if (bottom_overlap == 0) { 2701 log_info(os)("attempt_reserve_memory_at: possible alignment bug"); 2702 } 2703 unmap_memory(requested_addr, bottom_overlap); 2704 size[i] = bytes - bottom_overlap; 2705 } else { 2706 size[i] = bytes; 2707 } 2708 } 2709 } 2710 } 2711 2712 // Give back the unused reserved pieces. 2713 2714 for (int j = 0; j < i; ++j) { 2715 if (base[j] != NULL) { 2716 unmap_memory(base[j], size[j]); 2717 } 2718 } 2719 2720 return (i < max_tries) ? requested_addr : NULL; 2721 } 2722 2723 bool os::pd_release_memory(char* addr, size_t bytes) { 2724 size_t size = bytes; 2725 return munmap(addr, size) == 0; 2726 } 2727 2728 static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 2729 assert(addr == (char*)align_down((uintptr_t)addr, os::vm_page_size()), 2730 "addr must be page aligned"); 2731 int retVal = mprotect(addr, bytes, prot); 2732 return retVal == 0; 2733 } 2734 2735 // Protect memory (Used to pass readonly pages through 2736 // JNI GetArray<type>Elements with empty arrays.) 2737 // Also, used for serialization page and for compressed oops null pointer 2738 // checking. 2739 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2740 bool is_committed) { 2741 unsigned int p = 0; 2742 switch (prot) { 2743 case MEM_PROT_NONE: p = PROT_NONE; break; 2744 case MEM_PROT_READ: p = PROT_READ; break; 2745 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2746 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2747 default: 2748 ShouldNotReachHere(); 2749 } 2750 // is_committed is unused. 2751 return solaris_mprotect(addr, bytes, p); 2752 } 2753 2754 // guard_memory and unguard_memory only happens within stack guard pages. 2755 // Since ISM pertains only to the heap, guard and unguard memory should not 2756 /// happen with an ISM region. 2757 bool os::guard_memory(char* addr, size_t bytes) { 2758 return solaris_mprotect(addr, bytes, PROT_NONE); 2759 } 2760 2761 bool os::unguard_memory(char* addr, size_t bytes) { 2762 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 2763 } 2764 2765 // Large page support 2766 static size_t _large_page_size = 0; 2767 2768 // Insertion sort for small arrays (descending order). 2769 static void insertion_sort_descending(size_t* array, int len) { 2770 for (int i = 0; i < len; i++) { 2771 size_t val = array[i]; 2772 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 2773 size_t tmp = array[key]; 2774 array[key] = array[key - 1]; 2775 array[key - 1] = tmp; 2776 } 2777 } 2778 } 2779 2780 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) { 2781 const unsigned int usable_count = VM_Version::page_size_count(); 2782 if (usable_count == 1) { 2783 return false; 2784 } 2785 2786 // Find the right getpagesizes interface. When solaris 11 is the minimum 2787 // build platform, getpagesizes() (without the '2') can be called directly. 2788 typedef int (*gps_t)(size_t[], int); 2789 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); 2790 if (gps_func == NULL) { 2791 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); 2792 if (gps_func == NULL) { 2793 if (warn) { 2794 warning("MPSS is not supported by the operating system."); 2795 } 2796 return false; 2797 } 2798 } 2799 2800 // Fill the array of page sizes. 2801 int n = (*gps_func)(_page_sizes, page_sizes_max); 2802 assert(n > 0, "Solaris bug?"); 2803 2804 if (n == page_sizes_max) { 2805 // Add a sentinel value (necessary only if the array was completely filled 2806 // since it is static (zeroed at initialization)). 2807 _page_sizes[--n] = 0; 2808 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 2809 } 2810 assert(_page_sizes[n] == 0, "missing sentinel"); 2811 trace_page_sizes("available page sizes", _page_sizes, n); 2812 2813 if (n == 1) return false; // Only one page size available. 2814 2815 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 2816 // select up to usable_count elements. First sort the array, find the first 2817 // acceptable value, then copy the usable sizes to the top of the array and 2818 // trim the rest. Make sure to include the default page size :-). 2819 // 2820 // A better policy could get rid of the 4M limit by taking the sizes of the 2821 // important VM memory regions (java heap and possibly the code cache) into 2822 // account. 2823 insertion_sort_descending(_page_sizes, n); 2824 const size_t size_limit = 2825 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 2826 int beg; 2827 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */; 2828 const int end = MIN2((int)usable_count, n) - 1; 2829 for (int cur = 0; cur < end; ++cur, ++beg) { 2830 _page_sizes[cur] = _page_sizes[beg]; 2831 } 2832 _page_sizes[end] = vm_page_size(); 2833 _page_sizes[end + 1] = 0; 2834 2835 if (_page_sizes[end] > _page_sizes[end - 1]) { 2836 // Default page size is not the smallest; sort again. 2837 insertion_sort_descending(_page_sizes, end + 1); 2838 } 2839 *page_size = _page_sizes[0]; 2840 2841 trace_page_sizes("usable page sizes", _page_sizes, end + 1); 2842 return true; 2843 } 2844 2845 void os::large_page_init() { 2846 if (UseLargePages) { 2847 // print a warning if any large page related flag is specified on command line 2848 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2849 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2850 2851 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 2852 } 2853 } 2854 2855 bool os::Solaris::is_valid_page_size(size_t bytes) { 2856 for (int i = 0; _page_sizes[i] != 0; i++) { 2857 if (_page_sizes[i] == bytes) { 2858 return true; 2859 } 2860 } 2861 return false; 2862 } 2863 2864 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) { 2865 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align); 2866 assert(is_aligned((void*) start, align), 2867 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align); 2868 assert(is_aligned(bytes, align), 2869 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align); 2870 2871 // Signal to OS that we want large pages for addresses 2872 // from addr, addr + bytes 2873 struct memcntl_mha mpss_struct; 2874 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 2875 mpss_struct.mha_pagesize = align; 2876 mpss_struct.mha_flags = 0; 2877 // Upon successful completion, memcntl() returns 0 2878 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) { 2879 debug_only(warning("Attempt to use MPSS failed.")); 2880 return false; 2881 } 2882 return true; 2883 } 2884 2885 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) { 2886 fatal("os::reserve_memory_special should not be called on Solaris."); 2887 return NULL; 2888 } 2889 2890 bool os::release_memory_special(char* base, size_t bytes) { 2891 fatal("os::release_memory_special should not be called on Solaris."); 2892 return false; 2893 } 2894 2895 size_t os::large_page_size() { 2896 return _large_page_size; 2897 } 2898 2899 // MPSS allows application to commit large page memory on demand; with ISM 2900 // the entire memory region must be allocated as shared memory. 2901 bool os::can_commit_large_page_memory() { 2902 return true; 2903 } 2904 2905 bool os::can_execute_large_page_memory() { 2906 return true; 2907 } 2908 2909 // Read calls from inside the vm need to perform state transitions 2910 size_t os::read(int fd, void *buf, unsigned int nBytes) { 2911 size_t res; 2912 JavaThread* thread = (JavaThread*)Thread::current(); 2913 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 2914 ThreadBlockInVM tbiv(thread); 2915 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 2916 return res; 2917 } 2918 2919 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 2920 size_t res; 2921 JavaThread* thread = (JavaThread*)Thread::current(); 2922 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 2923 ThreadBlockInVM tbiv(thread); 2924 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res); 2925 return res; 2926 } 2927 2928 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) { 2929 size_t res; 2930 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 2931 "Assumed _thread_in_native"); 2932 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 2933 return res; 2934 } 2935 2936 void os::naked_short_sleep(jlong ms) { 2937 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 2938 2939 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but 2940 // Solaris requires -lrt for this. 2941 usleep((ms * 1000)); 2942 2943 return; 2944 } 2945 2946 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2947 void os::infinite_sleep() { 2948 while (true) { // sleep forever ... 2949 ::sleep(100); // ... 100 seconds at a time 2950 } 2951 } 2952 2953 // Used to convert frequent JVM_Yield() to nops 2954 bool os::dont_yield() { 2955 if (DontYieldALot) { 2956 static hrtime_t last_time = 0; 2957 hrtime_t diff = getTimeNanos() - last_time; 2958 2959 if (diff < DontYieldALotInterval * 1000000) { 2960 return true; 2961 } 2962 2963 last_time += diff; 2964 2965 return false; 2966 } else { 2967 return false; 2968 } 2969 } 2970 2971 // Note that yield semantics are defined by the scheduling class to which 2972 // the thread currently belongs. Typically, yield will _not yield to 2973 // other equal or higher priority threads that reside on the dispatch queues 2974 // of other CPUs. 2975 2976 void os::naked_yield() { 2977 thr_yield(); 2978 } 2979 2980 // Interface for setting lwp priorities. We are using T2 libthread, 2981 // which forces the use of bound threads, so all of our threads will 2982 // be assigned to real lwp's. Using the thr_setprio function is 2983 // meaningless in this mode so we must adjust the real lwp's priority. 2984 // The routines below implement the getting and setting of lwp priorities. 2985 // 2986 // Note: There are three priority scales used on Solaris. Java priotities 2987 // which range from 1 to 10, libthread "thr_setprio" scale which range 2988 // from 0 to 127, and the current scheduling class of the process we 2989 // are running in. This is typically from -60 to +60. 2990 // The setting of the lwp priorities in done after a call to thr_setprio 2991 // so Java priorities are mapped to libthread priorities and we map from 2992 // the latter to lwp priorities. We don't keep priorities stored in 2993 // Java priorities since some of our worker threads want to set priorities 2994 // higher than all Java threads. 2995 // 2996 // For related information: 2997 // (1) man -s 2 priocntl 2998 // (2) man -s 4 priocntl 2999 // (3) man dispadmin 3000 // = librt.so 3001 // = libthread/common/rtsched.c - thrp_setlwpprio(). 3002 // = ps -cL <pid> ... to validate priority. 3003 // = sched_get_priority_min and _max 3004 // pthread_create 3005 // sched_setparam 3006 // pthread_setschedparam 3007 // 3008 // Assumptions: 3009 // + We assume that all threads in the process belong to the same 3010 // scheduling class. IE. an homogenous process. 3011 // + Must be root or in IA group to change change "interactive" attribute. 3012 // Priocntl() will fail silently. The only indication of failure is when 3013 // we read-back the value and notice that it hasn't changed. 3014 // + Interactive threads enter the runq at the head, non-interactive at the tail. 3015 // + For RT, change timeslice as well. Invariant: 3016 // constant "priority integral" 3017 // Konst == TimeSlice * (60-Priority) 3018 // Given a priority, compute appropriate timeslice. 3019 // + Higher numerical values have higher priority. 3020 3021 // sched class attributes 3022 typedef struct { 3023 int schedPolicy; // classID 3024 int maxPrio; 3025 int minPrio; 3026 } SchedInfo; 3027 3028 3029 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; 3030 3031 #ifdef ASSERT 3032 static int ReadBackValidate = 1; 3033 #endif 3034 static int myClass = 0; 3035 static int myMin = 0; 3036 static int myMax = 0; 3037 static int myCur = 0; 3038 static bool priocntl_enable = false; 3039 3040 static const int criticalPrio = FXCriticalPriority; 3041 static int java_MaxPriority_to_os_priority = 0; // Saved mapping 3042 3043 3044 // lwp_priocntl_init 3045 // 3046 // Try to determine the priority scale for our process. 3047 // 3048 // Return errno or 0 if OK. 3049 // 3050 static int lwp_priocntl_init() { 3051 int rslt; 3052 pcinfo_t ClassInfo; 3053 pcparms_t ParmInfo; 3054 int i; 3055 3056 if (!UseThreadPriorities) return 0; 3057 3058 // If ThreadPriorityPolicy is 1, switch tables 3059 if (ThreadPriorityPolicy == 1) { 3060 for (i = 0; i < CriticalPriority+1; i++) 3061 os::java_to_os_priority[i] = prio_policy1[i]; 3062 } 3063 if (UseCriticalJavaThreadPriority) { 3064 // MaxPriority always maps to the FX scheduling class and criticalPrio. 3065 // See set_native_priority() and set_lwp_class_and_priority(). 3066 // Save original MaxPriority mapping in case attempt to 3067 // use critical priority fails. 3068 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; 3069 // Set negative to distinguish from other priorities 3070 os::java_to_os_priority[MaxPriority] = -criticalPrio; 3071 } 3072 3073 // Get IDs for a set of well-known scheduling classes. 3074 // TODO-FIXME: GETCLINFO returns the current # of classes in the 3075 // the system. We should have a loop that iterates over the 3076 // classID values, which are known to be "small" integers. 3077 3078 strcpy(ClassInfo.pc_clname, "TS"); 3079 ClassInfo.pc_cid = -1; 3080 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3081 if (rslt < 0) return errno; 3082 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 3083 tsLimits.schedPolicy = ClassInfo.pc_cid; 3084 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 3085 tsLimits.minPrio = -tsLimits.maxPrio; 3086 3087 strcpy(ClassInfo.pc_clname, "IA"); 3088 ClassInfo.pc_cid = -1; 3089 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3090 if (rslt < 0) return errno; 3091 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 3092 iaLimits.schedPolicy = ClassInfo.pc_cid; 3093 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 3094 iaLimits.minPrio = -iaLimits.maxPrio; 3095 3096 strcpy(ClassInfo.pc_clname, "RT"); 3097 ClassInfo.pc_cid = -1; 3098 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3099 if (rslt < 0) return errno; 3100 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 3101 rtLimits.schedPolicy = ClassInfo.pc_cid; 3102 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 3103 rtLimits.minPrio = 0; 3104 3105 strcpy(ClassInfo.pc_clname, "FX"); 3106 ClassInfo.pc_cid = -1; 3107 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3108 if (rslt < 0) return errno; 3109 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); 3110 fxLimits.schedPolicy = ClassInfo.pc_cid; 3111 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; 3112 fxLimits.minPrio = 0; 3113 3114 // Query our "current" scheduling class. 3115 // This will normally be IA, TS or, rarely, FX or RT. 3116 memset(&ParmInfo, 0, sizeof(ParmInfo)); 3117 ParmInfo.pc_cid = PC_CLNULL; 3118 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3119 if (rslt < 0) return errno; 3120 myClass = ParmInfo.pc_cid; 3121 3122 // We now know our scheduling classId, get specific information 3123 // about the class. 3124 ClassInfo.pc_cid = myClass; 3125 ClassInfo.pc_clname[0] = 0; 3126 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); 3127 if (rslt < 0) return errno; 3128 3129 if (ThreadPriorityVerbose) { 3130 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 3131 } 3132 3133 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3134 ParmInfo.pc_cid = PC_CLNULL; 3135 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3136 if (rslt < 0) return errno; 3137 3138 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3139 myMin = rtLimits.minPrio; 3140 myMax = rtLimits.maxPrio; 3141 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3142 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3143 myMin = iaLimits.minPrio; 3144 myMax = iaLimits.maxPrio; 3145 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 3146 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3147 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3148 myMin = tsLimits.minPrio; 3149 myMax = tsLimits.maxPrio; 3150 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 3151 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3152 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3153 myMin = fxLimits.minPrio; 3154 myMax = fxLimits.maxPrio; 3155 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict 3156 } else { 3157 // No clue - punt 3158 if (ThreadPriorityVerbose) { 3159 tty->print_cr("Unknown scheduling class: %s ... \n", 3160 ClassInfo.pc_clname); 3161 } 3162 return EINVAL; // no clue, punt 3163 } 3164 3165 if (ThreadPriorityVerbose) { 3166 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax); 3167 } 3168 3169 priocntl_enable = true; // Enable changing priorities 3170 return 0; 3171 } 3172 3173 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 3174 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 3175 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 3176 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) 3177 3178 3179 // scale_to_lwp_priority 3180 // 3181 // Convert from the libthread "thr_setprio" scale to our current 3182 // lwp scheduling class scale. 3183 // 3184 static int scale_to_lwp_priority(int rMin, int rMax, int x) { 3185 int v; 3186 3187 if (x == 127) return rMax; // avoid round-down 3188 v = (((x*(rMax-rMin)))/128)+rMin; 3189 return v; 3190 } 3191 3192 3193 // set_lwp_class_and_priority 3194 int set_lwp_class_and_priority(int ThreadID, int lwpid, 3195 int newPrio, int new_class, bool scale) { 3196 int rslt; 3197 int Actual, Expected, prv; 3198 pcparms_t ParmInfo; // for GET-SET 3199 #ifdef ASSERT 3200 pcparms_t ReadBack; // for readback 3201 #endif 3202 3203 // Set priority via PC_GETPARMS, update, PC_SETPARMS 3204 // Query current values. 3205 // TODO: accelerate this by eliminating the PC_GETPARMS call. 3206 // Cache "pcparms_t" in global ParmCache. 3207 // TODO: elide set-to-same-value 3208 3209 // If something went wrong on init, don't change priorities. 3210 if (!priocntl_enable) { 3211 if (ThreadPriorityVerbose) { 3212 tty->print_cr("Trying to set priority but init failed, ignoring"); 3213 } 3214 return EINVAL; 3215 } 3216 3217 // If lwp hasn't started yet, just return 3218 // the _start routine will call us again. 3219 if (lwpid <= 0) { 3220 if (ThreadPriorityVerbose) { 3221 tty->print_cr("deferring the set_lwp_class_and_priority of thread " 3222 INTPTR_FORMAT " to %d, lwpid not set", 3223 ThreadID, newPrio); 3224 } 3225 return 0; 3226 } 3227 3228 if (ThreadPriorityVerbose) { 3229 tty->print_cr ("set_lwp_class_and_priority(" 3230 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 3231 ThreadID, lwpid, newPrio); 3232 } 3233 3234 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3235 ParmInfo.pc_cid = PC_CLNULL; 3236 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 3237 if (rslt < 0) return errno; 3238 3239 int cur_class = ParmInfo.pc_cid; 3240 ParmInfo.pc_cid = (id_t)new_class; 3241 3242 if (new_class == rtLimits.schedPolicy) { 3243 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 3244 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, 3245 rtLimits.maxPrio, newPrio) 3246 : newPrio; 3247 rtInfo->rt_tqsecs = RT_NOCHANGE; 3248 rtInfo->rt_tqnsecs = RT_NOCHANGE; 3249 if (ThreadPriorityVerbose) { 3250 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 3251 } 3252 } else if (new_class == iaLimits.schedPolicy) { 3253 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3254 int maxClamped = MIN2(iaLimits.maxPrio, 3255 cur_class == new_class 3256 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); 3257 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, 3258 maxClamped, newPrio) 3259 : newPrio; 3260 iaInfo->ia_uprilim = cur_class == new_class 3261 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; 3262 iaInfo->ia_mode = IA_NOCHANGE; 3263 if (ThreadPriorityVerbose) { 3264 tty->print_cr("IA: [%d...%d] %d->%d\n", 3265 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 3266 } 3267 } else if (new_class == tsLimits.schedPolicy) { 3268 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3269 int maxClamped = MIN2(tsLimits.maxPrio, 3270 cur_class == new_class 3271 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); 3272 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, 3273 maxClamped, newPrio) 3274 : newPrio; 3275 tsInfo->ts_uprilim = cur_class == new_class 3276 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; 3277 if (ThreadPriorityVerbose) { 3278 tty->print_cr("TS: [%d...%d] %d->%d\n", 3279 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 3280 } 3281 } else if (new_class == fxLimits.schedPolicy) { 3282 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3283 int maxClamped = MIN2(fxLimits.maxPrio, 3284 cur_class == new_class 3285 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); 3286 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, 3287 maxClamped, newPrio) 3288 : newPrio; 3289 fxInfo->fx_uprilim = cur_class == new_class 3290 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; 3291 fxInfo->fx_tqsecs = FX_NOCHANGE; 3292 fxInfo->fx_tqnsecs = FX_NOCHANGE; 3293 if (ThreadPriorityVerbose) { 3294 tty->print_cr("FX: [%d...%d] %d->%d\n", 3295 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); 3296 } 3297 } else { 3298 if (ThreadPriorityVerbose) { 3299 tty->print_cr("Unknown new scheduling class %d\n", new_class); 3300 } 3301 return EINVAL; // no clue, punt 3302 } 3303 3304 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 3305 if (ThreadPriorityVerbose && rslt) { 3306 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 3307 } 3308 if (rslt < 0) return errno; 3309 3310 #ifdef ASSERT 3311 // Sanity check: read back what we just attempted to set. 3312 // In theory it could have changed in the interim ... 3313 // 3314 // The priocntl system call is tricky. 3315 // Sometimes it'll validate the priority value argument and 3316 // return EINVAL if unhappy. At other times it fails silently. 3317 // Readbacks are prudent. 3318 3319 if (!ReadBackValidate) return 0; 3320 3321 memset(&ReadBack, 0, sizeof(pcparms_t)); 3322 ReadBack.pc_cid = PC_CLNULL; 3323 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 3324 assert(rslt >= 0, "priocntl failed"); 3325 Actual = Expected = 0xBAD; 3326 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3327 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3328 Actual = RTPRI(ReadBack)->rt_pri; 3329 Expected = RTPRI(ParmInfo)->rt_pri; 3330 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3331 Actual = IAPRI(ReadBack)->ia_upri; 3332 Expected = IAPRI(ParmInfo)->ia_upri; 3333 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3334 Actual = TSPRI(ReadBack)->ts_upri; 3335 Expected = TSPRI(ParmInfo)->ts_upri; 3336 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3337 Actual = FXPRI(ReadBack)->fx_upri; 3338 Expected = FXPRI(ParmInfo)->fx_upri; 3339 } else { 3340 if (ThreadPriorityVerbose) { 3341 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", 3342 ParmInfo.pc_cid); 3343 } 3344 } 3345 3346 if (Actual != Expected) { 3347 if (ThreadPriorityVerbose) { 3348 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 3349 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 3350 } 3351 } 3352 #endif 3353 3354 return 0; 3355 } 3356 3357 // Solaris only gives access to 128 real priorities at a time, 3358 // so we expand Java's ten to fill this range. This would be better 3359 // if we dynamically adjusted relative priorities. 3360 // 3361 // The ThreadPriorityPolicy option allows us to select 2 different 3362 // priority scales. 3363 // 3364 // ThreadPriorityPolicy=0 3365 // Since the Solaris' default priority is MaximumPriority, we do not 3366 // set a priority lower than Max unless a priority lower than 3367 // NormPriority is requested. 3368 // 3369 // ThreadPriorityPolicy=1 3370 // This mode causes the priority table to get filled with 3371 // linear values. NormPriority get's mapped to 50% of the 3372 // Maximum priority an so on. This will cause VM threads 3373 // to get unfair treatment against other Solaris processes 3374 // which do not explicitly alter their thread priorities. 3375 3376 int os::java_to_os_priority[CriticalPriority + 1] = { 3377 -99999, // 0 Entry should never be used 3378 3379 0, // 1 MinPriority 3380 32, // 2 3381 64, // 3 3382 3383 96, // 4 3384 127, // 5 NormPriority 3385 127, // 6 3386 3387 127, // 7 3388 127, // 8 3389 127, // 9 NearMaxPriority 3390 3391 127, // 10 MaxPriority 3392 3393 -criticalPrio // 11 CriticalPriority 3394 }; 3395 3396 OSReturn os::set_native_priority(Thread* thread, int newpri) { 3397 OSThread* osthread = thread->osthread(); 3398 3399 // Save requested priority in case the thread hasn't been started 3400 osthread->set_native_priority(newpri); 3401 3402 // Check for critical priority request 3403 bool fxcritical = false; 3404 if (newpri == -criticalPrio) { 3405 fxcritical = true; 3406 newpri = criticalPrio; 3407 } 3408 3409 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 3410 if (!UseThreadPriorities) return OS_OK; 3411 3412 int status = 0; 3413 3414 if (!fxcritical) { 3415 // Use thr_setprio only if we have a priority that thr_setprio understands 3416 status = thr_setprio(thread->osthread()->thread_id(), newpri); 3417 } 3418 3419 int lwp_status = 3420 set_lwp_class_and_priority(osthread->thread_id(), 3421 osthread->lwp_id(), 3422 newpri, 3423 fxcritical ? fxLimits.schedPolicy : myClass, 3424 !fxcritical); 3425 if (lwp_status != 0 && fxcritical) { 3426 // Try again, this time without changing the scheduling class 3427 newpri = java_MaxPriority_to_os_priority; 3428 lwp_status = set_lwp_class_and_priority(osthread->thread_id(), 3429 osthread->lwp_id(), 3430 newpri, myClass, false); 3431 } 3432 status |= lwp_status; 3433 return (status == 0) ? OS_OK : OS_ERR; 3434 } 3435 3436 3437 OSReturn os::get_native_priority(const Thread* const thread, 3438 int *priority_ptr) { 3439 int p; 3440 if (!UseThreadPriorities) { 3441 *priority_ptr = NormalPriority; 3442 return OS_OK; 3443 } 3444 int status = thr_getprio(thread->osthread()->thread_id(), &p); 3445 if (status != 0) { 3446 return OS_ERR; 3447 } 3448 *priority_ptr = p; 3449 return OS_OK; 3450 } 3451 3452 3453 // Hint to the underlying OS that a task switch would not be good. 3454 // Void return because it's a hint and can fail. 3455 void os::hint_no_preempt() { 3456 schedctl_start(schedctl_init()); 3457 } 3458 3459 //////////////////////////////////////////////////////////////////////////////// 3460 // suspend/resume support 3461 3462 // The low-level signal-based suspend/resume support is a remnant from the 3463 // old VM-suspension that used to be for java-suspension, safepoints etc, 3464 // within hotspot. Currently used by JFR's OSThreadSampler 3465 // 3466 // The remaining code is greatly simplified from the more general suspension 3467 // code that used to be used. 3468 // 3469 // The protocol is quite simple: 3470 // - suspend: 3471 // - sends a signal to the target thread 3472 // - polls the suspend state of the osthread using a yield loop 3473 // - target thread signal handler (SR_handler) sets suspend state 3474 // and blocks in sigsuspend until continued 3475 // - resume: 3476 // - sets target osthread state to continue 3477 // - sends signal to end the sigsuspend loop in the SR_handler 3478 // 3479 // Note that the SR_lock plays no role in this suspend/resume protocol, 3480 // but is checked for NULL in SR_handler as a thread termination indicator. 3481 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. 3482 // 3483 // Note that resume_clear_context() and suspend_save_context() are needed 3484 // by SR_handler(), so that fetch_frame_from_ucontext() works, 3485 // which in part is used by: 3486 // - Forte Analyzer: AsyncGetCallTrace() 3487 // - StackBanging: get_frame_at_stack_banging_point() 3488 // - JFR: get_topframe()-->....-->get_valid_uc_in_signal_handler() 3489 3490 static void resume_clear_context(OSThread *osthread) { 3491 osthread->set_ucontext(NULL); 3492 } 3493 3494 static void suspend_save_context(OSThread *osthread, ucontext_t* context) { 3495 osthread->set_ucontext(context); 3496 } 3497 3498 static PosixSemaphore sr_semaphore; 3499 3500 void os::Solaris::SR_handler(Thread* thread, ucontext_t* context) { 3501 // Save and restore errno to avoid confusing native code with EINTR 3502 // after sigsuspend. 3503 int old_errno = errno; 3504 3505 OSThread* osthread = thread->osthread(); 3506 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 3507 3508 os::SuspendResume::State current = osthread->sr.state(); 3509 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 3510 suspend_save_context(osthread, context); 3511 3512 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 3513 os::SuspendResume::State state = osthread->sr.suspended(); 3514 if (state == os::SuspendResume::SR_SUSPENDED) { 3515 sigset_t suspend_set; // signals for sigsuspend() 3516 3517 // get current set of blocked signals and unblock resume signal 3518 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 3519 sigdelset(&suspend_set, ASYNC_SIGNAL); 3520 3521 sr_semaphore.signal(); 3522 // wait here until we are resumed 3523 while (1) { 3524 sigsuspend(&suspend_set); 3525 3526 os::SuspendResume::State result = osthread->sr.running(); 3527 if (result == os::SuspendResume::SR_RUNNING) { 3528 sr_semaphore.signal(); 3529 break; 3530 } 3531 } 3532 3533 } else if (state == os::SuspendResume::SR_RUNNING) { 3534 // request was cancelled, continue 3535 } else { 3536 ShouldNotReachHere(); 3537 } 3538 3539 resume_clear_context(osthread); 3540 } else if (current == os::SuspendResume::SR_RUNNING) { 3541 // request was cancelled, continue 3542 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 3543 // ignore 3544 } else { 3545 // ignore 3546 } 3547 3548 errno = old_errno; 3549 } 3550 3551 void os::print_statistics() { 3552 } 3553 3554 bool os::message_box(const char* title, const char* message) { 3555 int i; 3556 fdStream err(defaultStream::error_fd()); 3557 for (i = 0; i < 78; i++) err.print_raw("="); 3558 err.cr(); 3559 err.print_raw_cr(title); 3560 for (i = 0; i < 78; i++) err.print_raw("-"); 3561 err.cr(); 3562 err.print_raw_cr(message); 3563 for (i = 0; i < 78; i++) err.print_raw("="); 3564 err.cr(); 3565 3566 char buf[16]; 3567 // Prevent process from exiting upon "read error" without consuming all CPU 3568 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3569 3570 return buf[0] == 'y' || buf[0] == 'Y'; 3571 } 3572 3573 static int sr_notify(OSThread* osthread) { 3574 int status = thr_kill(osthread->thread_id(), ASYNC_SIGNAL); 3575 assert_status(status == 0, status, "thr_kill"); 3576 return status; 3577 } 3578 3579 // "Randomly" selected value for how long we want to spin 3580 // before bailing out on suspending a thread, also how often 3581 // we send a signal to a thread we want to resume 3582 static const int RANDOMLY_LARGE_INTEGER = 1000000; 3583 static const int RANDOMLY_LARGE_INTEGER2 = 100; 3584 3585 static bool do_suspend(OSThread* osthread) { 3586 assert(osthread->sr.is_running(), "thread should be running"); 3587 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 3588 3589 // mark as suspended and send signal 3590 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 3591 // failed to switch, state wasn't running? 3592 ShouldNotReachHere(); 3593 return false; 3594 } 3595 3596 if (sr_notify(osthread) != 0) { 3597 ShouldNotReachHere(); 3598 } 3599 3600 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 3601 while (true) { 3602 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) { 3603 break; 3604 } else { 3605 // timeout 3606 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 3607 if (cancelled == os::SuspendResume::SR_RUNNING) { 3608 return false; 3609 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 3610 // make sure that we consume the signal on the semaphore as well 3611 sr_semaphore.wait(); 3612 break; 3613 } else { 3614 ShouldNotReachHere(); 3615 return false; 3616 } 3617 } 3618 } 3619 3620 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 3621 return true; 3622 } 3623 3624 static void do_resume(OSThread* osthread) { 3625 assert(osthread->sr.is_suspended(), "thread should be suspended"); 3626 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 3627 3628 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 3629 // failed to switch to WAKEUP_REQUEST 3630 ShouldNotReachHere(); 3631 return; 3632 } 3633 3634 while (true) { 3635 if (sr_notify(osthread) == 0) { 3636 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 3637 if (osthread->sr.is_running()) { 3638 return; 3639 } 3640 } 3641 } else { 3642 ShouldNotReachHere(); 3643 } 3644 } 3645 3646 guarantee(osthread->sr.is_running(), "Must be running!"); 3647 } 3648 3649 void os::SuspendedThreadTask::internal_do_task() { 3650 if (do_suspend(_thread->osthread())) { 3651 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3652 do_task(context); 3653 do_resume(_thread->osthread()); 3654 } 3655 } 3656 3657 // This does not do anything on Solaris. This is basically a hook for being 3658 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 3659 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3660 const methodHandle& method, JavaCallArguments* args, 3661 Thread* thread) { 3662 f(value, method, args, thread); 3663 } 3664 3665 // This routine may be used by user applications as a "hook" to catch signals. 3666 // The user-defined signal handler must pass unrecognized signals to this 3667 // routine, and if it returns true (non-zero), then the signal handler must 3668 // return immediately. If the flag "abort_if_unrecognized" is true, then this 3669 // routine will never retun false (zero), but instead will execute a VM panic 3670 // routine kill the process. 3671 // 3672 // If this routine returns false, it is OK to call it again. This allows 3673 // the user-defined signal handler to perform checks either before or after 3674 // the VM performs its own checks. Naturally, the user code would be making 3675 // a serious error if it tried to handle an exception (such as a null check 3676 // or breakpoint) that the VM was generating for its own correct operation. 3677 // 3678 // This routine may recognize any of the following kinds of signals: 3679 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 3680 // ASYNC_SIGNAL. 3681 // It should be consulted by handlers for any of those signals. 3682 // 3683 // The caller of this routine must pass in the three arguments supplied 3684 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 3685 // field of the structure passed to sigaction(). This routine assumes that 3686 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3687 // 3688 // Note that the VM will print warnings if it detects conflicting signal 3689 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3690 // 3691 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo, 3692 siginfo_t* siginfo, 3693 void* ucontext, 3694 int abort_if_unrecognized); 3695 3696 3697 void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 3698 int orig_errno = errno; // Preserve errno value over signal handler. 3699 JVM_handle_solaris_signal(sig, info, ucVoid, true); 3700 errno = orig_errno; 3701 } 3702 3703 // This boolean allows users to forward their own non-matching signals 3704 // to JVM_handle_solaris_signal, harmlessly. 3705 bool os::Solaris::signal_handlers_are_installed = false; 3706 3707 // For signal-chaining 3708 bool os::Solaris::libjsig_is_loaded = false; 3709 typedef struct sigaction *(*get_signal_t)(int); 3710 get_signal_t os::Solaris::get_signal_action = NULL; 3711 3712 struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 3713 struct sigaction *actp = NULL; 3714 3715 if ((libjsig_is_loaded) && (sig <= Maxsignum)) { 3716 // Retrieve the old signal handler from libjsig 3717 actp = (*get_signal_action)(sig); 3718 } 3719 if (actp == NULL) { 3720 // Retrieve the preinstalled signal handler from jvm 3721 actp = get_preinstalled_handler(sig); 3722 } 3723 3724 return actp; 3725 } 3726 3727 static bool call_chained_handler(struct sigaction *actp, int sig, 3728 siginfo_t *siginfo, void *context) { 3729 // Call the old signal handler 3730 if (actp->sa_handler == SIG_DFL) { 3731 // It's more reasonable to let jvm treat it as an unexpected exception 3732 // instead of taking the default action. 3733 return false; 3734 } else if (actp->sa_handler != SIG_IGN) { 3735 if ((actp->sa_flags & SA_NODEFER) == 0) { 3736 // automaticlly block the signal 3737 sigaddset(&(actp->sa_mask), sig); 3738 } 3739 3740 sa_handler_t hand; 3741 sa_sigaction_t sa; 3742 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3743 // retrieve the chained handler 3744 if (siginfo_flag_set) { 3745 sa = actp->sa_sigaction; 3746 } else { 3747 hand = actp->sa_handler; 3748 } 3749 3750 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3751 actp->sa_handler = SIG_DFL; 3752 } 3753 3754 // try to honor the signal mask 3755 sigset_t oset; 3756 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3757 3758 // call into the chained handler 3759 if (siginfo_flag_set) { 3760 (*sa)(sig, siginfo, context); 3761 } else { 3762 (*hand)(sig); 3763 } 3764 3765 // restore the signal mask 3766 pthread_sigmask(SIG_SETMASK, &oset, 0); 3767 } 3768 // Tell jvm's signal handler the signal is taken care of. 3769 return true; 3770 } 3771 3772 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3773 bool chained = false; 3774 // signal-chaining 3775 if (UseSignalChaining) { 3776 struct sigaction *actp = get_chained_signal_action(sig); 3777 if (actp != NULL) { 3778 chained = call_chained_handler(actp, sig, siginfo, context); 3779 } 3780 } 3781 return chained; 3782 } 3783 3784 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 3785 assert((chainedsigactions != (struct sigaction *)NULL) && 3786 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3787 if (preinstalled_sigs[sig] != 0) { 3788 return &chainedsigactions[sig]; 3789 } 3790 return NULL; 3791 } 3792 3793 void os::Solaris::save_preinstalled_handler(int sig, 3794 struct sigaction& oldAct) { 3795 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 3796 assert((chainedsigactions != (struct sigaction *)NULL) && 3797 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3798 chainedsigactions[sig] = oldAct; 3799 preinstalled_sigs[sig] = 1; 3800 } 3801 3802 void os::Solaris::set_signal_handler(int sig, bool set_installed, 3803 bool oktochain) { 3804 // Check for overwrite. 3805 struct sigaction oldAct; 3806 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3807 void* oldhand = 3808 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3809 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3810 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3811 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3812 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 3813 if (AllowUserSignalHandlers || !set_installed) { 3814 // Do not overwrite; user takes responsibility to forward to us. 3815 return; 3816 } else if (UseSignalChaining) { 3817 if (oktochain) { 3818 // save the old handler in jvm 3819 save_preinstalled_handler(sig, oldAct); 3820 } else { 3821 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal."); 3822 } 3823 // libjsig also interposes the sigaction() call below and saves the 3824 // old sigaction on it own. 3825 } else { 3826 fatal("Encountered unexpected pre-existing sigaction handler " 3827 "%#lx for signal %d.", (long)oldhand, sig); 3828 } 3829 } 3830 3831 struct sigaction sigAct; 3832 sigfillset(&(sigAct.sa_mask)); 3833 sigAct.sa_handler = SIG_DFL; 3834 3835 sigAct.sa_sigaction = signalHandler; 3836 // Handle SIGSEGV on alternate signal stack if 3837 // not using stack banging 3838 if (!UseStackBanging && sig == SIGSEGV) { 3839 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 3840 } else { 3841 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 3842 } 3843 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 3844 3845 sigaction(sig, &sigAct, &oldAct); 3846 3847 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3848 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3849 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3850 } 3851 3852 3853 #define DO_SIGNAL_CHECK(sig) \ 3854 do { \ 3855 if (!sigismember(&check_signal_done, sig)) { \ 3856 os::Solaris::check_signal_handler(sig); \ 3857 } \ 3858 } while (0) 3859 3860 // This method is a periodic task to check for misbehaving JNI applications 3861 // under CheckJNI, we can add any periodic checks here 3862 3863 void os::run_periodic_checks() { 3864 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 3865 // thereby preventing a NULL checks. 3866 if (!check_addr0_done) check_addr0_done = check_addr0(tty); 3867 3868 if (check_signals == false) return; 3869 3870 // SEGV and BUS if overridden could potentially prevent 3871 // generation of hs*.log in the event of a crash, debugging 3872 // such a case can be very challenging, so we absolutely 3873 // check for the following for a good measure: 3874 DO_SIGNAL_CHECK(SIGSEGV); 3875 DO_SIGNAL_CHECK(SIGILL); 3876 DO_SIGNAL_CHECK(SIGFPE); 3877 DO_SIGNAL_CHECK(SIGBUS); 3878 DO_SIGNAL_CHECK(SIGPIPE); 3879 DO_SIGNAL_CHECK(SIGXFSZ); 3880 DO_SIGNAL_CHECK(ASYNC_SIGNAL); 3881 3882 // ReduceSignalUsage allows the user to override these handlers 3883 // see comments at the very top and jvm_solaris.h 3884 if (!ReduceSignalUsage) { 3885 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3886 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3887 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3888 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3889 } 3890 } 3891 3892 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3893 3894 static os_sigaction_t os_sigaction = NULL; 3895 3896 void os::Solaris::check_signal_handler(int sig) { 3897 char buf[O_BUFLEN]; 3898 address jvmHandler = NULL; 3899 3900 struct sigaction act; 3901 if (os_sigaction == NULL) { 3902 // only trust the default sigaction, in case it has been interposed 3903 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3904 if (os_sigaction == NULL) return; 3905 } 3906 3907 os_sigaction(sig, (struct sigaction*)NULL, &act); 3908 3909 address thisHandler = (act.sa_flags & SA_SIGINFO) 3910 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3911 : CAST_FROM_FN_PTR(address, act.sa_handler); 3912 3913 3914 switch (sig) { 3915 case SIGSEGV: 3916 case SIGBUS: 3917 case SIGFPE: 3918 case SIGPIPE: 3919 case SIGXFSZ: 3920 case SIGILL: 3921 case ASYNC_SIGNAL: 3922 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 3923 break; 3924 3925 case SHUTDOWN1_SIGNAL: 3926 case SHUTDOWN2_SIGNAL: 3927 case SHUTDOWN3_SIGNAL: 3928 case BREAK_SIGNAL: 3929 jvmHandler = (address)user_handler(); 3930 break; 3931 3932 default: 3933 return; 3934 } 3935 3936 if (thisHandler != jvmHandler) { 3937 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3938 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3939 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3940 // No need to check this sig any longer 3941 sigaddset(&check_signal_done, sig); 3942 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3943 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3944 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3945 exception_name(sig, buf, O_BUFLEN)); 3946 } 3947 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 3948 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3949 tty->print("expected:"); 3950 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig)); 3951 tty->cr(); 3952 tty->print(" found:"); 3953 os::Posix::print_sa_flags(tty, act.sa_flags); 3954 tty->cr(); 3955 // No need to check this sig any longer 3956 sigaddset(&check_signal_done, sig); 3957 } 3958 3959 // Print all the signal handler state 3960 if (sigismember(&check_signal_done, sig)) { 3961 print_signal_handlers(tty, buf, O_BUFLEN); 3962 } 3963 3964 } 3965 3966 void os::Solaris::install_signal_handlers() { 3967 signal_handlers_are_installed = true; 3968 3969 // signal-chaining 3970 typedef void (*signal_setting_t)(); 3971 signal_setting_t begin_signal_setting = NULL; 3972 signal_setting_t end_signal_setting = NULL; 3973 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3974 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3975 if (begin_signal_setting != NULL) { 3976 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3977 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3978 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3979 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3980 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t, 3981 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version")); 3982 libjsig_is_loaded = true; 3983 if (os::Solaris::get_libjsig_version != NULL) { 3984 int libjsigversion = (*os::Solaris::get_libjsig_version)(); 3985 assert(libjsigversion == JSIG_VERSION_1_4_1, "libjsig version mismatch"); 3986 } 3987 assert(UseSignalChaining, "should enable signal-chaining"); 3988 } 3989 if (libjsig_is_loaded) { 3990 // Tell libjsig jvm is setting signal handlers 3991 (*begin_signal_setting)(); 3992 } 3993 3994 set_signal_handler(SIGSEGV, true, true); 3995 set_signal_handler(SIGPIPE, true, true); 3996 set_signal_handler(SIGXFSZ, true, true); 3997 set_signal_handler(SIGBUS, true, true); 3998 set_signal_handler(SIGILL, true, true); 3999 set_signal_handler(SIGFPE, true, true); 4000 set_signal_handler(ASYNC_SIGNAL, true, true); 4001 4002 if (libjsig_is_loaded) { 4003 // Tell libjsig jvm finishes setting signal handlers 4004 (*end_signal_setting)(); 4005 } 4006 4007 // We don't activate signal checker if libjsig is in place, we trust ourselves 4008 // and if UserSignalHandler is installed all bets are off. 4009 // Log that signal checking is off only if -verbose:jni is specified. 4010 if (CheckJNICalls) { 4011 if (libjsig_is_loaded) { 4012 if (PrintJNIResolving) { 4013 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 4014 } 4015 check_signals = false; 4016 } 4017 if (AllowUserSignalHandlers) { 4018 if (PrintJNIResolving) { 4019 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4020 } 4021 check_signals = false; 4022 } 4023 } 4024 } 4025 4026 4027 void report_error(const char* file_name, int line_no, const char* title, 4028 const char* format, ...); 4029 4030 // (Static) wrappers for the liblgrp API 4031 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 4032 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 4033 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 4034 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 4035 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 4036 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 4037 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 4038 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 4039 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 4040 4041 static address resolve_symbol_lazy(const char* name) { 4042 address addr = (address) dlsym(RTLD_DEFAULT, name); 4043 if (addr == NULL) { 4044 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 4045 addr = (address) dlsym(RTLD_NEXT, name); 4046 } 4047 return addr; 4048 } 4049 4050 static address resolve_symbol(const char* name) { 4051 address addr = resolve_symbol_lazy(name); 4052 if (addr == NULL) { 4053 fatal(dlerror()); 4054 } 4055 return addr; 4056 } 4057 4058 void os::Solaris::libthread_init() { 4059 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 4060 4061 lwp_priocntl_init(); 4062 4063 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 4064 if (func == NULL) { 4065 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 4066 // Guarantee that this VM is running on an new enough OS (5.6 or 4067 // later) that it will have a new enough libthread.so. 4068 guarantee(func != NULL, "libthread.so is too old."); 4069 } 4070 4071 int size; 4072 void (*handler_info_func)(address *, int *); 4073 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 4074 handler_info_func(&handler_start, &size); 4075 handler_end = handler_start + size; 4076 } 4077 4078 4079 int_fnP_mutex_tP os::Solaris::_mutex_lock; 4080 int_fnP_mutex_tP os::Solaris::_mutex_trylock; 4081 int_fnP_mutex_tP os::Solaris::_mutex_unlock; 4082 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 4083 int_fnP_mutex_tP os::Solaris::_mutex_destroy; 4084 int os::Solaris::_mutex_scope = USYNC_THREAD; 4085 4086 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 4087 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 4088 int_fnP_cond_tP os::Solaris::_cond_signal; 4089 int_fnP_cond_tP os::Solaris::_cond_broadcast; 4090 int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 4091 int_fnP_cond_tP os::Solaris::_cond_destroy; 4092 int os::Solaris::_cond_scope = USYNC_THREAD; 4093 bool os::Solaris::_synchronization_initialized; 4094 4095 void os::Solaris::synchronization_init() { 4096 if (UseLWPSynchronization) { 4097 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 4098 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 4099 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 4100 os::Solaris::set_mutex_init(lwp_mutex_init); 4101 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 4102 os::Solaris::set_mutex_scope(USYNC_THREAD); 4103 4104 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 4105 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 4106 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 4107 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 4108 os::Solaris::set_cond_init(lwp_cond_init); 4109 os::Solaris::set_cond_destroy(lwp_cond_destroy); 4110 os::Solaris::set_cond_scope(USYNC_THREAD); 4111 } else { 4112 os::Solaris::set_mutex_scope(USYNC_THREAD); 4113 os::Solaris::set_cond_scope(USYNC_THREAD); 4114 4115 if (UsePthreads) { 4116 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 4117 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 4118 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 4119 os::Solaris::set_mutex_init(pthread_mutex_default_init); 4120 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 4121 4122 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 4123 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 4124 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 4125 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 4126 os::Solaris::set_cond_init(pthread_cond_default_init); 4127 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 4128 } else { 4129 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 4130 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 4131 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 4132 os::Solaris::set_mutex_init(::mutex_init); 4133 os::Solaris::set_mutex_destroy(::mutex_destroy); 4134 4135 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 4136 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 4137 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 4138 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 4139 os::Solaris::set_cond_init(::cond_init); 4140 os::Solaris::set_cond_destroy(::cond_destroy); 4141 } 4142 } 4143 _synchronization_initialized = true; 4144 } 4145 4146 bool os::Solaris::liblgrp_init() { 4147 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 4148 if (handle != NULL) { 4149 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 4150 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 4151 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 4152 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 4153 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 4154 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 4155 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 4156 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 4157 dlsym(handle, "lgrp_cookie_stale"))); 4158 4159 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 4160 set_lgrp_cookie(c); 4161 return true; 4162 } 4163 return false; 4164 } 4165 4166 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 4167 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 4168 static pset_getloadavg_type pset_getloadavg_ptr = NULL; 4169 4170 void init_pset_getloadavg_ptr(void) { 4171 pset_getloadavg_ptr = 4172 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 4173 if (pset_getloadavg_ptr == NULL) { 4174 log_warning(os)("pset_getloadavg function not found"); 4175 } 4176 } 4177 4178 int os::Solaris::_dev_zero_fd = -1; 4179 4180 // this is called _before_ the global arguments have been parsed 4181 void os::init(void) { 4182 _initial_pid = getpid(); 4183 4184 max_hrtime = first_hrtime = gethrtime(); 4185 4186 init_random(1234567); 4187 4188 page_size = sysconf(_SC_PAGESIZE); 4189 if (page_size == -1) { 4190 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 4191 } 4192 init_page_sizes((size_t) page_size); 4193 4194 Solaris::initialize_system_info(); 4195 4196 int fd = ::open("/dev/zero", O_RDWR); 4197 if (fd < 0) { 4198 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno)); 4199 } else { 4200 Solaris::set_dev_zero_fd(fd); 4201 4202 // Close on exec, child won't inherit. 4203 fcntl(fd, F_SETFD, FD_CLOEXEC); 4204 } 4205 4206 clock_tics_per_sec = CLK_TCK; 4207 4208 // check if dladdr1() exists; dladdr1 can provide more information than 4209 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 4210 // and is available on linker patches for 5.7 and 5.8. 4211 // libdl.so must have been loaded, this call is just an entry lookup 4212 void * hdl = dlopen("libdl.so", RTLD_NOW); 4213 if (hdl) { 4214 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 4215 } 4216 4217 // main_thread points to the thread that created/loaded the JVM. 4218 main_thread = thr_self(); 4219 4220 // dynamic lookup of functions that may not be available in our lowest 4221 // supported Solaris release 4222 void * handle = dlopen("libc.so.1", RTLD_LAZY); 4223 if (handle != NULL) { 4224 Solaris::_pthread_setname_np = // from 11.3 4225 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np"); 4226 } 4227 } 4228 4229 // To install functions for atexit system call 4230 extern "C" { 4231 static void perfMemory_exit_helper() { 4232 perfMemory_exit(); 4233 } 4234 } 4235 4236 // this is called _after_ the global arguments have been parsed 4237 jint os::init_2(void) { 4238 // try to enable extended file IO ASAP, see 6431278 4239 os::Solaris::try_enable_extended_io(); 4240 4241 // Check and sets minimum stack sizes against command line options 4242 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 4243 return JNI_ERR; 4244 } 4245 4246 Solaris::libthread_init(); 4247 4248 if (UseNUMA) { 4249 if (!Solaris::liblgrp_init()) { 4250 UseNUMA = false; 4251 } else { 4252 size_t lgrp_limit = os::numa_get_groups_num(); 4253 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); 4254 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 4255 FREE_C_HEAP_ARRAY(int, lgrp_ids); 4256 if (lgrp_num < 2) { 4257 // There's only one locality group, disable NUMA. 4258 UseNUMA = false; 4259 } 4260 } 4261 if (!UseNUMA && ForceNUMA) { 4262 UseNUMA = true; 4263 } 4264 } 4265 4266 Solaris::signal_sets_init(); 4267 Solaris::init_signal_mem(); 4268 Solaris::install_signal_handlers(); 4269 4270 // initialize synchronization primitives to use either thread or 4271 // lwp synchronization (controlled by UseLWPSynchronization) 4272 Solaris::synchronization_init(); 4273 4274 if (MaxFDLimit) { 4275 // set the number of file descriptors to max. print out error 4276 // if getrlimit/setrlimit fails but continue regardless. 4277 struct rlimit nbr_files; 4278 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 4279 if (status != 0) { 4280 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 4281 } else { 4282 nbr_files.rlim_cur = nbr_files.rlim_max; 4283 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 4284 if (status != 0) { 4285 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 4286 } 4287 } 4288 } 4289 4290 // Calculate theoretical max. size of Threads to guard gainst 4291 // artifical out-of-memory situations, where all available address- 4292 // space has been reserved by thread stacks. Default stack size is 1Mb. 4293 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 4294 JavaThread::stack_size_at_create() : (1*K*K); 4295 assert(pre_thread_stack_size != 0, "Must have a stack"); 4296 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 4297 // we should start doing Virtual Memory banging. Currently when the threads will 4298 // have used all but 200Mb of space. 4299 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 4300 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 4301 4302 // at-exit methods are called in the reverse order of their registration. 4303 // In Solaris 7 and earlier, atexit functions are called on return from 4304 // main or as a result of a call to exit(3C). There can be only 32 of 4305 // these functions registered and atexit() does not set errno. In Solaris 4306 // 8 and later, there is no limit to the number of functions registered 4307 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 4308 // functions are called upon dlclose(3DL) in addition to return from main 4309 // and exit(3C). 4310 4311 if (PerfAllowAtExitRegistration) { 4312 // only register atexit functions if PerfAllowAtExitRegistration is set. 4313 // atexit functions can be delayed until process exit time, which 4314 // can be problematic for embedded VM situations. Embedded VMs should 4315 // call DestroyJavaVM() to assure that VM resources are released. 4316 4317 // note: perfMemory_exit_helper atexit function may be removed in 4318 // the future if the appropriate cleanup code can be added to the 4319 // VM_Exit VMOperation's doit method. 4320 if (atexit(perfMemory_exit_helper) != 0) { 4321 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 4322 } 4323 } 4324 4325 // Init pset_loadavg function pointer 4326 init_pset_getloadavg_ptr(); 4327 4328 return JNI_OK; 4329 } 4330 4331 // Mark the polling page as unreadable 4332 void os::make_polling_page_unreadable(void) { 4333 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) { 4334 fatal("Could not disable polling page"); 4335 } 4336 } 4337 4338 // Mark the polling page as readable 4339 void os::make_polling_page_readable(void) { 4340 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) { 4341 fatal("Could not enable polling page"); 4342 } 4343 } 4344 4345 // Is a (classpath) directory empty? 4346 bool os::dir_is_empty(const char* path) { 4347 DIR *dir = NULL; 4348 struct dirent *ptr; 4349 4350 dir = opendir(path); 4351 if (dir == NULL) return true; 4352 4353 // Scan the directory 4354 bool result = true; 4355 char buf[sizeof(struct dirent) + MAX_PATH]; 4356 struct dirent *dbuf = (struct dirent *) buf; 4357 while (result && (ptr = readdir(dir, dbuf)) != NULL) { 4358 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 4359 result = false; 4360 } 4361 } 4362 closedir(dir); 4363 return result; 4364 } 4365 4366 // This code originates from JDK's sysOpen and open64_w 4367 // from src/solaris/hpi/src/system_md.c 4368 4369 int os::open(const char *path, int oflag, int mode) { 4370 if (strlen(path) > MAX_PATH - 1) { 4371 errno = ENAMETOOLONG; 4372 return -1; 4373 } 4374 int fd; 4375 4376 fd = ::open64(path, oflag, mode); 4377 if (fd == -1) return -1; 4378 4379 // If the open succeeded, the file might still be a directory 4380 { 4381 struct stat64 buf64; 4382 int ret = ::fstat64(fd, &buf64); 4383 int st_mode = buf64.st_mode; 4384 4385 if (ret != -1) { 4386 if ((st_mode & S_IFMT) == S_IFDIR) { 4387 errno = EISDIR; 4388 ::close(fd); 4389 return -1; 4390 } 4391 } else { 4392 ::close(fd); 4393 return -1; 4394 } 4395 } 4396 4397 // 32-bit Solaris systems suffer from: 4398 // 4399 // - an historical default soft limit of 256 per-process file 4400 // descriptors that is too low for many Java programs. 4401 // 4402 // - a design flaw where file descriptors created using stdio 4403 // fopen must be less than 256, _even_ when the first limit above 4404 // has been raised. This can cause calls to fopen (but not calls to 4405 // open, for example) to fail mysteriously, perhaps in 3rd party 4406 // native code (although the JDK itself uses fopen). One can hardly 4407 // criticize them for using this most standard of all functions. 4408 // 4409 // We attempt to make everything work anyways by: 4410 // 4411 // - raising the soft limit on per-process file descriptors beyond 4412 // 256 4413 // 4414 // - As of Solaris 10u4, we can request that Solaris raise the 256 4415 // stdio fopen limit by calling function enable_extended_FILE_stdio. 4416 // This is done in init_2 and recorded in enabled_extended_FILE_stdio 4417 // 4418 // - If we are stuck on an old (pre 10u4) Solaris system, we can 4419 // workaround the bug by remapping non-stdio file descriptors below 4420 // 256 to ones beyond 256, which is done below. 4421 // 4422 // See: 4423 // 1085341: 32-bit stdio routines should support file descriptors >255 4424 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files 4425 // 6431278: Netbeans crash on 32 bit Solaris: need to call 4426 // enable_extended_FILE_stdio() in VM initialisation 4427 // Giri Mandalika's blog 4428 // http://technopark02.blogspot.com/2005_05_01_archive.html 4429 // 4430 #ifndef _LP64 4431 if ((!enabled_extended_FILE_stdio) && fd < 256) { 4432 int newfd = ::fcntl(fd, F_DUPFD, 256); 4433 if (newfd != -1) { 4434 ::close(fd); 4435 fd = newfd; 4436 } 4437 } 4438 #endif // 32-bit Solaris 4439 4440 // All file descriptors that are opened in the JVM and not 4441 // specifically destined for a subprocess should have the 4442 // close-on-exec flag set. If we don't set it, then careless 3rd 4443 // party native code might fork and exec without closing all 4444 // appropriate file descriptors (e.g. as we do in closeDescriptors in 4445 // UNIXProcess.c), and this in turn might: 4446 // 4447 // - cause end-of-file to fail to be detected on some file 4448 // descriptors, resulting in mysterious hangs, or 4449 // 4450 // - might cause an fopen in the subprocess to fail on a system 4451 // suffering from bug 1085341. 4452 // 4453 // (Yes, the default setting of the close-on-exec flag is a Unix 4454 // design flaw) 4455 // 4456 // See: 4457 // 1085341: 32-bit stdio routines should support file descriptors >255 4458 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 4459 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 4460 // 4461 #ifdef FD_CLOEXEC 4462 { 4463 int flags = ::fcntl(fd, F_GETFD); 4464 if (flags != -1) { 4465 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 4466 } 4467 } 4468 #endif 4469 4470 return fd; 4471 } 4472 4473 // create binary file, rewriting existing file if required 4474 int os::create_binary_file(const char* path, bool rewrite_existing) { 4475 int oflags = O_WRONLY | O_CREAT; 4476 if (!rewrite_existing) { 4477 oflags |= O_EXCL; 4478 } 4479 return ::open64(path, oflags, S_IREAD | S_IWRITE); 4480 } 4481 4482 // return current position of file pointer 4483 jlong os::current_file_offset(int fd) { 4484 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 4485 } 4486 4487 // move file pointer to the specified offset 4488 jlong os::seek_to_file_offset(int fd, jlong offset) { 4489 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 4490 } 4491 4492 jlong os::lseek(int fd, jlong offset, int whence) { 4493 return (jlong) ::lseek64(fd, offset, whence); 4494 } 4495 4496 char * os::native_path(char *path) { 4497 return path; 4498 } 4499 4500 int os::ftruncate(int fd, jlong length) { 4501 return ::ftruncate64(fd, length); 4502 } 4503 4504 int os::fsync(int fd) { 4505 RESTARTABLE_RETURN_INT(::fsync(fd)); 4506 } 4507 4508 int os::available(int fd, jlong *bytes) { 4509 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 4510 "Assumed _thread_in_native"); 4511 jlong cur, end; 4512 int mode; 4513 struct stat64 buf64; 4514 4515 if (::fstat64(fd, &buf64) >= 0) { 4516 mode = buf64.st_mode; 4517 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 4518 int n,ioctl_return; 4519 4520 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return); 4521 if (ioctl_return>= 0) { 4522 *bytes = n; 4523 return 1; 4524 } 4525 } 4526 } 4527 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 4528 return 0; 4529 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 4530 return 0; 4531 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 4532 return 0; 4533 } 4534 *bytes = end - cur; 4535 return 1; 4536 } 4537 4538 // Map a block of memory. 4539 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4540 char *addr, size_t bytes, bool read_only, 4541 bool allow_exec) { 4542 int prot; 4543 int flags; 4544 4545 if (read_only) { 4546 prot = PROT_READ; 4547 flags = MAP_SHARED; 4548 } else { 4549 prot = PROT_READ | PROT_WRITE; 4550 flags = MAP_PRIVATE; 4551 } 4552 4553 if (allow_exec) { 4554 prot |= PROT_EXEC; 4555 } 4556 4557 if (addr != NULL) { 4558 flags |= MAP_FIXED; 4559 } 4560 4561 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 4562 fd, file_offset); 4563 if (mapped_address == MAP_FAILED) { 4564 return NULL; 4565 } 4566 return mapped_address; 4567 } 4568 4569 4570 // Remap a block of memory. 4571 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4572 char *addr, size_t bytes, bool read_only, 4573 bool allow_exec) { 4574 // same as map_memory() on this OS 4575 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4576 allow_exec); 4577 } 4578 4579 4580 // Unmap a block of memory. 4581 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4582 return munmap(addr, bytes) == 0; 4583 } 4584 4585 void os::pause() { 4586 char filename[MAX_PATH]; 4587 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4588 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4589 } else { 4590 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4591 } 4592 4593 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4594 if (fd != -1) { 4595 struct stat buf; 4596 ::close(fd); 4597 while (::stat(filename, &buf) == 0) { 4598 (void)::poll(NULL, 0, 100); 4599 } 4600 } else { 4601 jio_fprintf(stderr, 4602 "Could not open pause file '%s', continuing immediately.\n", filename); 4603 } 4604 } 4605 4606 #ifndef PRODUCT 4607 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4608 // Turn this on if you need to trace synch operations. 4609 // Set RECORD_SYNCH_LIMIT to a large-enough value, 4610 // and call record_synch_enable and record_synch_disable 4611 // around the computation of interest. 4612 4613 void record_synch(char* name, bool returning); // defined below 4614 4615 class RecordSynch { 4616 char* _name; 4617 public: 4618 RecordSynch(char* name) :_name(name) { record_synch(_name, false); } 4619 ~RecordSynch() { record_synch(_name, true); } 4620 }; 4621 4622 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 4623 extern "C" ret name params { \ 4624 typedef ret name##_t params; \ 4625 static name##_t* implem = NULL; \ 4626 static int callcount = 0; \ 4627 if (implem == NULL) { \ 4628 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 4629 if (implem == NULL) fatal(dlerror()); \ 4630 } \ 4631 ++callcount; \ 4632 RecordSynch _rs(#name); \ 4633 inner; \ 4634 return implem args; \ 4635 } 4636 // in dbx, examine callcounts this way: 4637 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 4638 4639 #define CHECK_POINTER_OK(p) \ 4640 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) 4641 #define CHECK_MU \ 4642 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 4643 #define CHECK_CV \ 4644 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 4645 #define CHECK_P(p) \ 4646 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 4647 4648 #define CHECK_MUTEX(mutex_op) \ 4649 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 4650 4651 CHECK_MUTEX( mutex_lock) 4652 CHECK_MUTEX( _mutex_lock) 4653 CHECK_MUTEX( mutex_unlock) 4654 CHECK_MUTEX(_mutex_unlock) 4655 CHECK_MUTEX( mutex_trylock) 4656 CHECK_MUTEX(_mutex_trylock) 4657 4658 #define CHECK_COND(cond_op) \ 4659 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV); 4660 4661 CHECK_COND( cond_wait); 4662 CHECK_COND(_cond_wait); 4663 CHECK_COND(_cond_wait_cancel); 4664 4665 #define CHECK_COND2(cond_op) \ 4666 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV); 4667 4668 CHECK_COND2( cond_timedwait); 4669 CHECK_COND2(_cond_timedwait); 4670 CHECK_COND2(_cond_timedwait_cancel); 4671 4672 // do the _lwp_* versions too 4673 #define mutex_t lwp_mutex_t 4674 #define cond_t lwp_cond_t 4675 CHECK_MUTEX( _lwp_mutex_lock) 4676 CHECK_MUTEX( _lwp_mutex_unlock) 4677 CHECK_MUTEX( _lwp_mutex_trylock) 4678 CHECK_MUTEX( __lwp_mutex_lock) 4679 CHECK_MUTEX( __lwp_mutex_unlock) 4680 CHECK_MUTEX( __lwp_mutex_trylock) 4681 CHECK_MUTEX(___lwp_mutex_lock) 4682 CHECK_MUTEX(___lwp_mutex_unlock) 4683 4684 CHECK_COND( _lwp_cond_wait); 4685 CHECK_COND( __lwp_cond_wait); 4686 CHECK_COND(___lwp_cond_wait); 4687 4688 CHECK_COND2( _lwp_cond_timedwait); 4689 CHECK_COND2( __lwp_cond_timedwait); 4690 #undef mutex_t 4691 #undef cond_t 4692 4693 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4694 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4695 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 4696 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 4697 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4698 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4699 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4700 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4701 4702 4703 // recording machinery: 4704 4705 enum { RECORD_SYNCH_LIMIT = 200 }; 4706 char* record_synch_name[RECORD_SYNCH_LIMIT]; 4707 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 4708 bool record_synch_returning[RECORD_SYNCH_LIMIT]; 4709 thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 4710 int record_synch_count = 0; 4711 bool record_synch_enabled = false; 4712 4713 // in dbx, examine recorded data this way: 4714 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 4715 4716 void record_synch(char* name, bool returning) { 4717 if (record_synch_enabled) { 4718 if (record_synch_count < RECORD_SYNCH_LIMIT) { 4719 record_synch_name[record_synch_count] = name; 4720 record_synch_returning[record_synch_count] = returning; 4721 record_synch_thread[record_synch_count] = thr_self(); 4722 record_synch_arg0ptr[record_synch_count] = &name; 4723 record_synch_count++; 4724 } 4725 // put more checking code here: 4726 // ... 4727 } 4728 } 4729 4730 void record_synch_enable() { 4731 // start collecting trace data, if not already doing so 4732 if (!record_synch_enabled) record_synch_count = 0; 4733 record_synch_enabled = true; 4734 } 4735 4736 void record_synch_disable() { 4737 // stop collecting trace data 4738 record_synch_enabled = false; 4739 } 4740 4741 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4742 #endif // PRODUCT 4743 4744 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4745 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 4746 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4747 4748 4749 // JVMTI & JVM monitoring and management support 4750 // The thread_cpu_time() and current_thread_cpu_time() are only 4751 // supported if is_thread_cpu_time_supported() returns true. 4752 // They are not supported on Solaris T1. 4753 4754 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4755 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4756 // of a thread. 4757 // 4758 // current_thread_cpu_time() and thread_cpu_time(Thread *) 4759 // returns the fast estimate available on the platform. 4760 4761 // hrtime_t gethrvtime() return value includes 4762 // user time but does not include system time 4763 jlong os::current_thread_cpu_time() { 4764 return (jlong) gethrvtime(); 4765 } 4766 4767 jlong os::thread_cpu_time(Thread *thread) { 4768 // return user level CPU time only to be consistent with 4769 // what current_thread_cpu_time returns. 4770 // thread_cpu_time_info() must be changed if this changes 4771 return os::thread_cpu_time(thread, false /* user time only */); 4772 } 4773 4774 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4775 if (user_sys_cpu_time) { 4776 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4777 } else { 4778 return os::current_thread_cpu_time(); 4779 } 4780 } 4781 4782 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 4783 char proc_name[64]; 4784 int count; 4785 prusage_t prusage; 4786 jlong lwp_time; 4787 int fd; 4788 4789 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 4790 getpid(), 4791 thread->osthread()->lwp_id()); 4792 fd = ::open(proc_name, O_RDONLY); 4793 if (fd == -1) return -1; 4794 4795 do { 4796 count = ::pread(fd, 4797 (void *)&prusage.pr_utime, 4798 thr_time_size, 4799 thr_time_off); 4800 } while (count < 0 && errno == EINTR); 4801 ::close(fd); 4802 if (count < 0) return -1; 4803 4804 if (user_sys_cpu_time) { 4805 // user + system CPU time 4806 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 4807 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 4808 (jlong)prusage.pr_stime.tv_nsec + 4809 (jlong)prusage.pr_utime.tv_nsec; 4810 } else { 4811 // user level CPU time only 4812 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 4813 (jlong)prusage.pr_utime.tv_nsec; 4814 } 4815 4816 return (lwp_time); 4817 } 4818 4819 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4820 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4821 info_ptr->may_skip_backward = false; // elapsed time not wall time 4822 info_ptr->may_skip_forward = false; // elapsed time not wall time 4823 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4824 } 4825 4826 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4827 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4828 info_ptr->may_skip_backward = false; // elapsed time not wall time 4829 info_ptr->may_skip_forward = false; // elapsed time not wall time 4830 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4831 } 4832 4833 bool os::is_thread_cpu_time_supported() { 4834 return true; 4835 } 4836 4837 // System loadavg support. Returns -1 if load average cannot be obtained. 4838 // Return the load average for our processor set if the primitive exists 4839 // (Solaris 9 and later). Otherwise just return system wide loadavg. 4840 int os::loadavg(double loadavg[], int nelem) { 4841 if (pset_getloadavg_ptr != NULL) { 4842 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 4843 } else { 4844 return ::getloadavg(loadavg, nelem); 4845 } 4846 } 4847 4848 //--------------------------------------------------------------------------------- 4849 4850 bool os::find(address addr, outputStream* st) { 4851 Dl_info dlinfo; 4852 memset(&dlinfo, 0, sizeof(dlinfo)); 4853 if (dladdr(addr, &dlinfo) != 0) { 4854 st->print(PTR_FORMAT ": ", addr); 4855 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 4856 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 4857 } else if (dlinfo.dli_fbase != NULL) { 4858 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 4859 } else { 4860 st->print("<absolute address>"); 4861 } 4862 if (dlinfo.dli_fname != NULL) { 4863 st->print(" in %s", dlinfo.dli_fname); 4864 } 4865 if (dlinfo.dli_fbase != NULL) { 4866 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 4867 } 4868 st->cr(); 4869 4870 if (Verbose) { 4871 // decode some bytes around the PC 4872 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 4873 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 4874 address lowest = (address) dlinfo.dli_sname; 4875 if (!lowest) lowest = (address) dlinfo.dli_fbase; 4876 if (begin < lowest) begin = lowest; 4877 Dl_info dlinfo2; 4878 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 4879 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 4880 end = (address) dlinfo2.dli_saddr; 4881 } 4882 Disassembler::decode(begin, end, st); 4883 } 4884 return true; 4885 } 4886 return false; 4887 } 4888 4889 // Following function has been added to support HotSparc's libjvm.so running 4890 // under Solaris production JDK 1.2.2 / 1.3.0. These came from 4891 // src/solaris/hpi/native_threads in the EVM codebase. 4892 // 4893 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 4894 // libraries and should thus be removed. We will leave it behind for a while 4895 // until we no longer want to able to run on top of 1.3.0 Solaris production 4896 // JDK. See 4341971. 4897 4898 #define STACK_SLACK 0x800 4899 4900 extern "C" { 4901 intptr_t sysThreadAvailableStackWithSlack() { 4902 stack_t st; 4903 intptr_t retval, stack_top; 4904 retval = thr_stksegment(&st); 4905 assert(retval == 0, "incorrect return value from thr_stksegment"); 4906 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 4907 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 4908 stack_top=(intptr_t)st.ss_sp-st.ss_size; 4909 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 4910 } 4911 } 4912 4913 // ObjectMonitor park-unpark infrastructure ... 4914 // 4915 // We implement Solaris and Linux PlatformEvents with the 4916 // obvious condvar-mutex-flag triple. 4917 // Another alternative that works quite well is pipes: 4918 // Each PlatformEvent consists of a pipe-pair. 4919 // The thread associated with the PlatformEvent 4920 // calls park(), which reads from the input end of the pipe. 4921 // Unpark() writes into the other end of the pipe. 4922 // The write-side of the pipe must be set NDELAY. 4923 // Unfortunately pipes consume a large # of handles. 4924 // Native solaris lwp_park() and lwp_unpark() work nicely, too. 4925 // Using pipes for the 1st few threads might be workable, however. 4926 // 4927 // park() is permitted to return spuriously. 4928 // Callers of park() should wrap the call to park() in 4929 // an appropriate loop. A litmus test for the correct 4930 // usage of park is the following: if park() were modified 4931 // to immediately return 0 your code should still work, 4932 // albeit degenerating to a spin loop. 4933 // 4934 // In a sense, park()-unpark() just provides more polite spinning 4935 // and polling with the key difference over naive spinning being 4936 // that a parked thread needs to be explicitly unparked() in order 4937 // to wake up and to poll the underlying condition. 4938 // 4939 // Assumption: 4940 // Only one parker can exist on an event, which is why we allocate 4941 // them per-thread. Multiple unparkers can coexist. 4942 // 4943 // _Event transitions in park() 4944 // -1 => -1 : illegal 4945 // 1 => 0 : pass - return immediately 4946 // 0 => -1 : block; then set _Event to 0 before returning 4947 // 4948 // _Event transitions in unpark() 4949 // 0 => 1 : just return 4950 // 1 => 1 : just return 4951 // -1 => either 0 or 1; must signal target thread 4952 // That is, we can safely transition _Event from -1 to either 4953 // 0 or 1. 4954 // 4955 // _Event serves as a restricted-range semaphore. 4956 // -1 : thread is blocked, i.e. there is a waiter 4957 // 0 : neutral: thread is running or ready, 4958 // could have been signaled after a wait started 4959 // 1 : signaled - thread is running or ready 4960 // 4961 // Another possible encoding of _Event would be with 4962 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 4963 // 4964 // TODO-FIXME: add DTRACE probes for: 4965 // 1. Tx parks 4966 // 2. Ty unparks Tx 4967 // 3. Tx resumes from park 4968 4969 4970 // value determined through experimentation 4971 #define ROUNDINGFIX 11 4972 4973 // utility to compute the abstime argument to timedwait. 4974 // TODO-FIXME: switch from compute_abstime() to unpackTime(). 4975 4976 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 4977 // millis is the relative timeout time 4978 // abstime will be the absolute timeout time 4979 if (millis < 0) millis = 0; 4980 struct timeval now; 4981 int status = gettimeofday(&now, NULL); 4982 assert(status == 0, "gettimeofday"); 4983 jlong seconds = millis / 1000; 4984 jlong max_wait_period; 4985 4986 if (UseLWPSynchronization) { 4987 // forward port of fix for 4275818 (not sleeping long enough) 4988 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 4989 // _lwp_cond_timedwait() used a round_down algorithm rather 4990 // than a round_up. For millis less than our roundfactor 4991 // it rounded down to 0 which doesn't meet the spec. 4992 // For millis > roundfactor we may return a bit sooner, but 4993 // since we can not accurately identify the patch level and 4994 // this has already been fixed in Solaris 9 and 8 we will 4995 // leave it alone rather than always rounding down. 4996 4997 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 4998 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 4999 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 5000 max_wait_period = 21000000; 5001 } else { 5002 max_wait_period = 50000000; 5003 } 5004 millis %= 1000; 5005 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 5006 seconds = max_wait_period; 5007 } 5008 abstime->tv_sec = now.tv_sec + seconds; 5009 long usec = now.tv_usec + millis * 1000; 5010 if (usec >= 1000000) { 5011 abstime->tv_sec += 1; 5012 usec -= 1000000; 5013 } 5014 abstime->tv_nsec = usec * 1000; 5015 return abstime; 5016 } 5017 5018 void os::PlatformEvent::park() { // AKA: down() 5019 // Transitions for _Event: 5020 // -1 => -1 : illegal 5021 // 1 => 0 : pass - return immediately 5022 // 0 => -1 : block; then set _Event to 0 before returning 5023 5024 // Invariant: Only the thread associated with the Event/PlatformEvent 5025 // may call park(). 5026 assert(_nParked == 0, "invariant"); 5027 5028 int v; 5029 for (;;) { 5030 v = _Event; 5031 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5032 } 5033 guarantee(v >= 0, "invariant"); 5034 if (v == 0) { 5035 // Do this the hard way by blocking ... 5036 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5037 int status = os::Solaris::mutex_lock(_mutex); 5038 assert_status(status == 0, status, "mutex_lock"); 5039 guarantee(_nParked == 0, "invariant"); 5040 ++_nParked; 5041 while (_Event < 0) { 5042 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 5043 // Treat this the same as if the wait was interrupted 5044 // With usr/lib/lwp going to kernel, always handle ETIME 5045 status = os::Solaris::cond_wait(_cond, _mutex); 5046 if (status == ETIME) status = EINTR; 5047 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 5048 } 5049 --_nParked; 5050 _Event = 0; 5051 status = os::Solaris::mutex_unlock(_mutex); 5052 assert_status(status == 0, status, "mutex_unlock"); 5053 // Paranoia to ensure our locked and lock-free paths interact 5054 // correctly with each other. 5055 OrderAccess::fence(); 5056 } 5057 } 5058 5059 int os::PlatformEvent::park(jlong millis) { 5060 // Transitions for _Event: 5061 // -1 => -1 : illegal 5062 // 1 => 0 : pass - return immediately 5063 // 0 => -1 : block; then set _Event to 0 before returning 5064 5065 guarantee(_nParked == 0, "invariant"); 5066 int v; 5067 for (;;) { 5068 v = _Event; 5069 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5070 } 5071 guarantee(v >= 0, "invariant"); 5072 if (v != 0) return OS_OK; 5073 5074 int ret = OS_TIMEOUT; 5075 timestruc_t abst; 5076 compute_abstime(&abst, millis); 5077 5078 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5079 int status = os::Solaris::mutex_lock(_mutex); 5080 assert_status(status == 0, status, "mutex_lock"); 5081 guarantee(_nParked == 0, "invariant"); 5082 ++_nParked; 5083 while (_Event < 0) { 5084 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 5085 assert_status(status == 0 || status == EINTR || 5086 status == ETIME || status == ETIMEDOUT, 5087 status, "cond_timedwait"); 5088 if (!FilterSpuriousWakeups) break; // previous semantics 5089 if (status == ETIME || status == ETIMEDOUT) break; 5090 // We consume and ignore EINTR and spurious wakeups. 5091 } 5092 --_nParked; 5093 if (_Event >= 0) ret = OS_OK; 5094 _Event = 0; 5095 status = os::Solaris::mutex_unlock(_mutex); 5096 assert_status(status == 0, status, "mutex_unlock"); 5097 // Paranoia to ensure our locked and lock-free paths interact 5098 // correctly with each other. 5099 OrderAccess::fence(); 5100 return ret; 5101 } 5102 5103 void os::PlatformEvent::unpark() { 5104 // Transitions for _Event: 5105 // 0 => 1 : just return 5106 // 1 => 1 : just return 5107 // -1 => either 0 or 1; must signal target thread 5108 // That is, we can safely transition _Event from -1 to either 5109 // 0 or 1. 5110 // See also: "Semaphores in Plan 9" by Mullender & Cox 5111 // 5112 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5113 // that it will take two back-to-back park() calls for the owning 5114 // thread to block. This has the benefit of forcing a spurious return 5115 // from the first park() call after an unpark() call which will help 5116 // shake out uses of park() and unpark() without condition variables. 5117 5118 if (Atomic::xchg(1, &_Event) >= 0) return; 5119 5120 // If the thread associated with the event was parked, wake it. 5121 // Wait for the thread assoc with the PlatformEvent to vacate. 5122 int status = os::Solaris::mutex_lock(_mutex); 5123 assert_status(status == 0, status, "mutex_lock"); 5124 int AnyWaiters = _nParked; 5125 status = os::Solaris::mutex_unlock(_mutex); 5126 assert_status(status == 0, status, "mutex_unlock"); 5127 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 5128 if (AnyWaiters != 0) { 5129 // Note that we signal() *after* dropping the lock for "immortal" Events. 5130 // This is safe and avoids a common class of futile wakeups. In rare 5131 // circumstances this can cause a thread to return prematurely from 5132 // cond_{timed}wait() but the spurious wakeup is benign and the victim 5133 // will simply re-test the condition and re-park itself. 5134 // This provides particular benefit if the underlying platform does not 5135 // provide wait morphing. 5136 status = os::Solaris::cond_signal(_cond); 5137 assert_status(status == 0, status, "cond_signal"); 5138 } 5139 } 5140 5141 // JSR166 5142 // ------------------------------------------------------- 5143 5144 // The solaris and linux implementations of park/unpark are fairly 5145 // conservative for now, but can be improved. They currently use a 5146 // mutex/condvar pair, plus _counter. 5147 // Park decrements _counter if > 0, else does a condvar wait. Unpark 5148 // sets count to 1 and signals condvar. Only one thread ever waits 5149 // on the condvar. Contention seen when trying to park implies that someone 5150 // is unparking you, so don't wait. And spurious returns are fine, so there 5151 // is no need to track notifications. 5152 5153 #define MAX_SECS 100000000 5154 5155 // This code is common to linux and solaris and will be moved to a 5156 // common place in dolphin. 5157 // 5158 // The passed in time value is either a relative time in nanoseconds 5159 // or an absolute time in milliseconds. Either way it has to be unpacked 5160 // into suitable seconds and nanoseconds components and stored in the 5161 // given timespec structure. 5162 // Given time is a 64-bit value and the time_t used in the timespec is only 5163 // a signed-32-bit value (except on 64-bit Linux) we have to watch for 5164 // overflow if times way in the future are given. Further on Solaris versions 5165 // prior to 10 there is a restriction (see cond_timedwait) that the specified 5166 // number of seconds, in abstime, is less than current_time + 100,000,000. 5167 // As it will be 28 years before "now + 100000000" will overflow we can 5168 // ignore overflow and just impose a hard-limit on seconds using the value 5169 // of "now + 100,000,000". This places a limit on the timeout of about 3.17 5170 // years from "now". 5171 // 5172 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 5173 assert(time > 0, "convertTime"); 5174 5175 struct timeval now; 5176 int status = gettimeofday(&now, NULL); 5177 assert(status == 0, "gettimeofday"); 5178 5179 time_t max_secs = now.tv_sec + MAX_SECS; 5180 5181 if (isAbsolute) { 5182 jlong secs = time / 1000; 5183 if (secs > max_secs) { 5184 absTime->tv_sec = max_secs; 5185 } else { 5186 absTime->tv_sec = secs; 5187 } 5188 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 5189 } else { 5190 jlong secs = time / NANOSECS_PER_SEC; 5191 if (secs >= MAX_SECS) { 5192 absTime->tv_sec = max_secs; 5193 absTime->tv_nsec = 0; 5194 } else { 5195 absTime->tv_sec = now.tv_sec + secs; 5196 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 5197 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 5198 absTime->tv_nsec -= NANOSECS_PER_SEC; 5199 ++absTime->tv_sec; // note: this must be <= max_secs 5200 } 5201 } 5202 } 5203 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 5204 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 5205 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 5206 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 5207 } 5208 5209 void Parker::park(bool isAbsolute, jlong time) { 5210 // Ideally we'd do something useful while spinning, such 5211 // as calling unpackTime(). 5212 5213 // Optional fast-path check: 5214 // Return immediately if a permit is available. 5215 // We depend on Atomic::xchg() having full barrier semantics 5216 // since we are doing a lock-free update to _counter. 5217 if (Atomic::xchg(0, &_counter) > 0) return; 5218 5219 // Optional fast-exit: Check interrupt before trying to wait 5220 Thread* thread = Thread::current(); 5221 assert(thread->is_Java_thread(), "Must be JavaThread"); 5222 JavaThread *jt = (JavaThread *)thread; 5223 if (Thread::is_interrupted(thread, false)) { 5224 return; 5225 } 5226 5227 // First, demultiplex/decode time arguments 5228 timespec absTime; 5229 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all 5230 return; 5231 } 5232 if (time > 0) { 5233 // Warning: this code might be exposed to the old Solaris time 5234 // round-down bugs. Grep "roundingFix" for details. 5235 unpackTime(&absTime, isAbsolute, time); 5236 } 5237 5238 // Enter safepoint region 5239 // Beware of deadlocks such as 6317397. 5240 // The per-thread Parker:: _mutex is a classic leaf-lock. 5241 // In particular a thread must never block on the Threads_lock while 5242 // holding the Parker:: mutex. If safepoints are pending both the 5243 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 5244 ThreadBlockInVM tbivm(jt); 5245 5246 // Don't wait if cannot get lock since interference arises from 5247 // unblocking. Also. check interrupt before trying wait 5248 if (Thread::is_interrupted(thread, false) || 5249 os::Solaris::mutex_trylock(_mutex) != 0) { 5250 return; 5251 } 5252 5253 int status; 5254 5255 if (_counter > 0) { // no wait needed 5256 _counter = 0; 5257 status = os::Solaris::mutex_unlock(_mutex); 5258 assert(status == 0, "invariant"); 5259 // Paranoia to ensure our locked and lock-free paths interact 5260 // correctly with each other and Java-level accesses. 5261 OrderAccess::fence(); 5262 return; 5263 } 5264 5265 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5266 jt->set_suspend_equivalent(); 5267 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 5268 5269 // Do this the hard way by blocking ... 5270 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5271 if (time == 0) { 5272 status = os::Solaris::cond_wait(_cond, _mutex); 5273 } else { 5274 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 5275 } 5276 // Note that an untimed cond_wait() can sometimes return ETIME on older 5277 // versions of the Solaris. 5278 assert_status(status == 0 || status == EINTR || 5279 status == ETIME || status == ETIMEDOUT, 5280 status, "cond_timedwait"); 5281 5282 _counter = 0; 5283 status = os::Solaris::mutex_unlock(_mutex); 5284 assert_status(status == 0, status, "mutex_unlock"); 5285 // Paranoia to ensure our locked and lock-free paths interact 5286 // correctly with each other and Java-level accesses. 5287 OrderAccess::fence(); 5288 5289 // If externally suspended while waiting, re-suspend 5290 if (jt->handle_special_suspend_equivalent_condition()) { 5291 jt->java_suspend_self(); 5292 } 5293 } 5294 5295 void Parker::unpark() { 5296 int status = os::Solaris::mutex_lock(_mutex); 5297 assert(status == 0, "invariant"); 5298 const int s = _counter; 5299 _counter = 1; 5300 status = os::Solaris::mutex_unlock(_mutex); 5301 assert(status == 0, "invariant"); 5302 5303 if (s < 1) { 5304 status = os::Solaris::cond_signal(_cond); 5305 assert(status == 0, "invariant"); 5306 } 5307 } 5308 5309 extern char** environ; 5310 5311 // Run the specified command in a separate process. Return its exit value, 5312 // or -1 on failure (e.g. can't fork a new process). 5313 // Unlike system(), this function can be called from signal handler. It 5314 // doesn't block SIGINT et al. 5315 int os::fork_and_exec(char* cmd) { 5316 char * argv[4]; 5317 argv[0] = (char *)"sh"; 5318 argv[1] = (char *)"-c"; 5319 argv[2] = cmd; 5320 argv[3] = NULL; 5321 5322 // fork is async-safe, fork1 is not so can't use in signal handler 5323 pid_t pid; 5324 Thread* t = Thread::current_or_null_safe(); 5325 if (t != NULL && t->is_inside_signal_handler()) { 5326 pid = fork(); 5327 } else { 5328 pid = fork1(); 5329 } 5330 5331 if (pid < 0) { 5332 // fork failed 5333 warning("fork failed: %s", os::strerror(errno)); 5334 return -1; 5335 5336 } else if (pid == 0) { 5337 // child process 5338 5339 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 5340 execve("/usr/bin/sh", argv, environ); 5341 5342 // execve failed 5343 _exit(-1); 5344 5345 } else { 5346 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5347 // care about the actual exit code, for now. 5348 5349 int status; 5350 5351 // Wait for the child process to exit. This returns immediately if 5352 // the child has already exited. */ 5353 while (waitpid(pid, &status, 0) < 0) { 5354 switch (errno) { 5355 case ECHILD: return 0; 5356 case EINTR: break; 5357 default: return -1; 5358 } 5359 } 5360 5361 if (WIFEXITED(status)) { 5362 // The child exited normally; get its exit code. 5363 return WEXITSTATUS(status); 5364 } else if (WIFSIGNALED(status)) { 5365 // The child exited because of a signal 5366 // The best value to return is 0x80 + signal number, 5367 // because that is what all Unix shells do, and because 5368 // it allows callers to distinguish between process exit and 5369 // process death by signal. 5370 return 0x80 + WTERMSIG(status); 5371 } else { 5372 // Unknown exit code; pass it through 5373 return status; 5374 } 5375 } 5376 } 5377 5378 // is_headless_jre() 5379 // 5380 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 5381 // in order to report if we are running in a headless jre 5382 // 5383 // Since JDK8 xawt/libmawt.so was moved into the same directory 5384 // as libawt.so, and renamed libawt_xawt.so 5385 // 5386 bool os::is_headless_jre() { 5387 struct stat statbuf; 5388 char buf[MAXPATHLEN]; 5389 char libmawtpath[MAXPATHLEN]; 5390 const char *xawtstr = "/xawt/libmawt.so"; 5391 const char *new_xawtstr = "/libawt_xawt.so"; 5392 char *p; 5393 5394 // Get path to libjvm.so 5395 os::jvm_path(buf, sizeof(buf)); 5396 5397 // Get rid of libjvm.so 5398 p = strrchr(buf, '/'); 5399 if (p == NULL) { 5400 return false; 5401 } else { 5402 *p = '\0'; 5403 } 5404 5405 // Get rid of client or server 5406 p = strrchr(buf, '/'); 5407 if (p == NULL) { 5408 return false; 5409 } else { 5410 *p = '\0'; 5411 } 5412 5413 // check xawt/libmawt.so 5414 strcpy(libmawtpath, buf); 5415 strcat(libmawtpath, xawtstr); 5416 if (::stat(libmawtpath, &statbuf) == 0) return false; 5417 5418 // check libawt_xawt.so 5419 strcpy(libmawtpath, buf); 5420 strcat(libmawtpath, new_xawtstr); 5421 if (::stat(libmawtpath, &statbuf) == 0) return false; 5422 5423 return true; 5424 } 5425 5426 size_t os::write(int fd, const void *buf, unsigned int nBytes) { 5427 size_t res; 5428 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res); 5429 return res; 5430 } 5431 5432 int os::close(int fd) { 5433 return ::close(fd); 5434 } 5435 5436 int os::socket_close(int fd) { 5437 return ::close(fd); 5438 } 5439 5440 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5441 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5442 "Assumed _thread_in_native"); 5443 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags)); 5444 } 5445 5446 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5447 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5448 "Assumed _thread_in_native"); 5449 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5450 } 5451 5452 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5453 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5454 } 5455 5456 // As both poll and select can be interrupted by signals, we have to be 5457 // prepared to restart the system call after updating the timeout, unless 5458 // a poll() is done with timeout == -1, in which case we repeat with this 5459 // "wait forever" value. 5460 5461 int os::connect(int fd, struct sockaddr *him, socklen_t len) { 5462 int _result; 5463 _result = ::connect(fd, him, len); 5464 5465 // On Solaris, when a connect() call is interrupted, the connection 5466 // can be established asynchronously (see 6343810). Subsequent calls 5467 // to connect() must check the errno value which has the semantic 5468 // described below (copied from the connect() man page). Handling 5469 // of asynchronously established connections is required for both 5470 // blocking and non-blocking sockets. 5471 // EINTR The connection attempt was interrupted 5472 // before any data arrived by the delivery of 5473 // a signal. The connection, however, will be 5474 // established asynchronously. 5475 // 5476 // EINPROGRESS The socket is non-blocking, and the connec- 5477 // tion cannot be completed immediately. 5478 // 5479 // EALREADY The socket is non-blocking, and a previous 5480 // connection attempt has not yet been com- 5481 // pleted. 5482 // 5483 // EISCONN The socket is already connected. 5484 if (_result == OS_ERR && errno == EINTR) { 5485 // restarting a connect() changes its errno semantics 5486 RESTARTABLE(::connect(fd, him, len), _result); 5487 // undo these changes 5488 if (_result == OS_ERR) { 5489 if (errno == EALREADY) { 5490 errno = EINPROGRESS; // fall through 5491 } else if (errno == EISCONN) { 5492 errno = 0; 5493 return OS_OK; 5494 } 5495 } 5496 } 5497 return _result; 5498 } 5499 5500 // Get the default path to the core file 5501 // Returns the length of the string 5502 int os::get_core_path(char* buffer, size_t bufferSize) { 5503 const char* p = get_current_directory(buffer, bufferSize); 5504 5505 if (p == NULL) { 5506 assert(p != NULL, "failed to get current directory"); 5507 return 0; 5508 } 5509 5510 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 5511 p, current_process_id()); 5512 5513 return strlen(buffer); 5514 } 5515 5516 #ifndef PRODUCT 5517 void TestReserveMemorySpecial_test() { 5518 // No tests available for this platform 5519 } 5520 #endif 5521 5522 bool os::start_debugging(char *buf, int buflen) { 5523 int len = (int)strlen(buf); 5524 char *p = &buf[len]; 5525 5526 jio_snprintf(p, buflen-len, 5527 "\n\n" 5528 "Do you want to debug the problem?\n\n" 5529 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n" 5530 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 5531 "Otherwise, press RETURN to abort...", 5532 os::current_process_id(), os::current_thread_id()); 5533 5534 bool yes = os::message_box("Unexpected Error", buf); 5535 5536 if (yes) { 5537 // yes, user asked VM to launch debugger 5538 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id()); 5539 5540 os::fork_and_exec(buf); 5541 yes = false; 5542 } 5543 return yes; 5544 }