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