1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // no precompiled headers 26 #include "jvm.h" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/systemDictionary.hpp" 29 #include "classfile/vmSymbols.hpp" 30 #include "code/icBuffer.hpp" 31 #include "code/vtableStubs.hpp" 32 #include "compiler/compileBroker.hpp" 33 #include "compiler/disassembler.hpp" 34 #include "interpreter/interpreter.hpp" 35 #include "logging/log.hpp" 36 #include "memory/allocation.inline.hpp" 37 #include "memory/filemap.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "os_share_solaris.hpp" 40 #include "os_solaris.inline.hpp" 41 #include "prims/jniFastGetField.hpp" 42 #include "prims/jvm_misc.hpp" 43 #include "runtime/arguments.hpp" 44 #include "runtime/atomic.hpp" 45 #include "runtime/extendedPC.hpp" 46 #include "runtime/globals.hpp" 47 #include "runtime/interfaceSupport.hpp" 48 #include "runtime/java.hpp" 49 #include "runtime/javaCalls.hpp" 50 #include "runtime/mutexLocker.hpp" 51 #include "runtime/objectMonitor.hpp" 52 #include "runtime/orderAccess.inline.hpp" 53 #include "runtime/osThread.hpp" 54 #include "runtime/perfMemory.hpp" 55 #include "runtime/sharedRuntime.hpp" 56 #include "runtime/statSampler.hpp" 57 #include "runtime/stubRoutines.hpp" 58 #include "runtime/thread.inline.hpp" 59 #include "runtime/threadCritical.hpp" 60 #include "runtime/timer.hpp" 61 #include "runtime/vm_version.hpp" 62 #include "semaphore_posix.hpp" 63 #include "services/attachListener.hpp" 64 #include "services/memTracker.hpp" 65 #include "services/runtimeService.hpp" 66 #include "utilities/align.hpp" 67 #include "utilities/decoder.hpp" 68 #include "utilities/defaultStream.hpp" 69 #include "utilities/events.hpp" 70 #include "utilities/growableArray.hpp" 71 #include "utilities/macros.hpp" 72 #include "utilities/vmError.hpp" 73 74 // put OS-includes here 75 # include <dlfcn.h> 76 # include <errno.h> 77 # include <exception> 78 # include <link.h> 79 # include <poll.h> 80 # include <pthread.h> 81 # include <schedctl.h> 82 # include <setjmp.h> 83 # include <signal.h> 84 # include <stdio.h> 85 # include <alloca.h> 86 # include <sys/filio.h> 87 # include <sys/ipc.h> 88 # include <sys/lwp.h> 89 # include <sys/machelf.h> // for elf Sym structure used by dladdr1 90 # include <sys/mman.h> 91 # include <sys/processor.h> 92 # include <sys/procset.h> 93 # include <sys/pset.h> 94 # include <sys/resource.h> 95 # include <sys/shm.h> 96 # include <sys/socket.h> 97 # include <sys/stat.h> 98 # include <sys/systeminfo.h> 99 # include <sys/time.h> 100 # include <sys/times.h> 101 # include <sys/types.h> 102 # include <sys/wait.h> 103 # include <sys/utsname.h> 104 # include <thread.h> 105 # include <unistd.h> 106 # include <sys/priocntl.h> 107 # include <sys/rtpriocntl.h> 108 # include <sys/tspriocntl.h> 109 # include <sys/iapriocntl.h> 110 # include <sys/fxpriocntl.h> 111 # include <sys/loadavg.h> 112 # include <string.h> 113 # include <stdio.h> 114 115 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 116 # include <sys/procfs.h> // see comment in <sys/procfs.h> 117 118 #define MAX_PATH (2 * K) 119 120 // for timer info max values which include all bits 121 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 122 123 124 // Here are some liblgrp types from sys/lgrp_user.h to be able to 125 // compile on older systems without this header file. 126 127 #ifndef MADV_ACCESS_LWP 128 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */ 129 #endif 130 #ifndef MADV_ACCESS_MANY 131 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */ 132 #endif 133 134 #ifndef LGRP_RSRC_CPU 135 #define LGRP_RSRC_CPU 0 /* CPU resources */ 136 #endif 137 #ifndef LGRP_RSRC_MEM 138 #define LGRP_RSRC_MEM 1 /* memory resources */ 139 #endif 140 141 // Values for ThreadPriorityPolicy == 1 142 int prio_policy1[CriticalPriority+1] = { 143 -99999, 0, 16, 32, 48, 64, 144 80, 96, 112, 124, 127, 127 }; 145 146 // System parameters used internally 147 static clock_t clock_tics_per_sec = 100; 148 149 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+) 150 static bool enabled_extended_FILE_stdio = false; 151 152 // For diagnostics to print a message once. see run_periodic_checks 153 static bool check_addr0_done = false; 154 static sigset_t check_signal_done; 155 static bool check_signals = true; 156 157 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo 158 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo 159 160 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround 161 162 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL; 163 164 // "default" initializers for missing libc APIs 165 extern "C" { 166 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 167 static int lwp_mutex_destroy(mutex_t *mx) { return 0; } 168 169 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 170 static int lwp_cond_destroy(cond_t *cv) { return 0; } 171 } 172 173 // "default" initializers for pthread-based synchronization 174 extern "C" { 175 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 176 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 177 } 178 179 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); 180 181 static inline size_t adjust_stack_size(address base, size_t size) { 182 if ((ssize_t)size < 0) { 183 // 4759953: Compensate for ridiculous stack size. 184 size = max_intx; 185 } 186 if (size > (size_t)base) { 187 // 4812466: Make sure size doesn't allow the stack to wrap the address space. 188 size = (size_t)base; 189 } 190 return size; 191 } 192 193 static inline stack_t get_stack_info() { 194 stack_t st; 195 int retval = thr_stksegment(&st); 196 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); 197 assert(retval == 0, "incorrect return value from thr_stksegment"); 198 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 199 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 200 return st; 201 } 202 203 address os::current_stack_base() { 204 int r = thr_main(); 205 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 206 bool is_primordial_thread = r; 207 208 // Workaround 4352906, avoid calls to thr_stksegment by 209 // thr_main after the first one (it looks like we trash 210 // some data, causing the value for ss_sp to be incorrect). 211 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) { 212 stack_t st = get_stack_info(); 213 if (is_primordial_thread) { 214 // cache initial value of stack base 215 os::Solaris::_main_stack_base = (address)st.ss_sp; 216 } 217 return (address)st.ss_sp; 218 } else { 219 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); 220 return os::Solaris::_main_stack_base; 221 } 222 } 223 224 size_t os::current_stack_size() { 225 size_t size; 226 227 int r = thr_main(); 228 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 229 if (!r) { 230 size = get_stack_info().ss_size; 231 } else { 232 struct rlimit limits; 233 getrlimit(RLIMIT_STACK, &limits); 234 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); 235 } 236 // base may not be page aligned 237 address base = current_stack_base(); 238 address bottom = align_up(base - size, os::vm_page_size());; 239 return (size_t)(base - bottom); 240 } 241 242 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 243 return localtime_r(clock, res); 244 } 245 246 void os::Solaris::try_enable_extended_io() { 247 typedef int (*enable_extended_FILE_stdio_t)(int, int); 248 249 if (!UseExtendedFileIO) { 250 return; 251 } 252 253 enable_extended_FILE_stdio_t enabler = 254 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT, 255 "enable_extended_FILE_stdio"); 256 if (enabler) { 257 enabler(-1, -1); 258 } 259 } 260 261 static int _processors_online = 0; 262 263 jint os::Solaris::_os_thread_limit = 0; 264 volatile jint os::Solaris::_os_thread_count = 0; 265 266 julong os::available_memory() { 267 return Solaris::available_memory(); 268 } 269 270 julong os::Solaris::available_memory() { 271 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); 272 } 273 274 julong os::Solaris::_physical_memory = 0; 275 276 julong os::physical_memory() { 277 return Solaris::physical_memory(); 278 } 279 280 static hrtime_t first_hrtime = 0; 281 static const hrtime_t hrtime_hz = 1000*1000*1000; 282 static volatile hrtime_t max_hrtime = 0; 283 284 285 void os::Solaris::initialize_system_info() { 286 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); 287 _processors_online = sysconf(_SC_NPROCESSORS_ONLN); 288 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * 289 (julong)sysconf(_SC_PAGESIZE); 290 } 291 292 int os::active_processor_count() { 293 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 294 pid_t pid = getpid(); 295 psetid_t pset = PS_NONE; 296 // Are we running in a processor set or is there any processor set around? 297 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) { 298 uint_t pset_cpus; 299 // Query the number of cpus available to us. 300 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) { 301 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check"); 302 _processors_online = pset_cpus; 303 return pset_cpus; 304 } 305 } 306 // Otherwise return number of online cpus 307 return online_cpus; 308 } 309 310 static bool find_processors_in_pset(psetid_t pset, 311 processorid_t** id_array, 312 uint_t* id_length) { 313 bool result = false; 314 // Find the number of processors in the processor set. 315 if (pset_info(pset, NULL, id_length, NULL) == 0) { 316 // Make up an array to hold their ids. 317 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 318 // Fill in the array with their processor ids. 319 if (pset_info(pset, NULL, id_length, *id_array) == 0) { 320 result = true; 321 } 322 } 323 return result; 324 } 325 326 // Callers of find_processors_online() must tolerate imprecise results -- 327 // the system configuration can change asynchronously because of DR 328 // or explicit psradm operations. 329 // 330 // We also need to take care that the loop (below) terminates as the 331 // number of processors online can change between the _SC_NPROCESSORS_ONLN 332 // request and the loop that builds the list of processor ids. Unfortunately 333 // there's no reliable way to determine the maximum valid processor id, 334 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online 335 // man pages, which claim the processor id set is "sparse, but 336 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually 337 // exit the loop. 338 // 339 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's 340 // not available on S8.0. 341 342 static bool find_processors_online(processorid_t** id_array, 343 uint* id_length) { 344 const processorid_t MAX_PROCESSOR_ID = 100000; 345 // Find the number of processors online. 346 *id_length = sysconf(_SC_NPROCESSORS_ONLN); 347 // Make up an array to hold their ids. 348 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 349 // Processors need not be numbered consecutively. 350 long found = 0; 351 processorid_t next = 0; 352 while (found < *id_length && next < MAX_PROCESSOR_ID) { 353 processor_info_t info; 354 if (processor_info(next, &info) == 0) { 355 // NB, PI_NOINTR processors are effectively online ... 356 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) { 357 (*id_array)[found] = next; 358 found += 1; 359 } 360 } 361 next += 1; 362 } 363 if (found < *id_length) { 364 // The loop above didn't identify the expected number of processors. 365 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN) 366 // and re-running the loop, above, but there's no guarantee of progress 367 // if the system configuration is in flux. Instead, we just return what 368 // we've got. Note that in the worst case find_processors_online() could 369 // return an empty set. (As a fall-back in the case of the empty set we 370 // could just return the ID of the current processor). 371 *id_length = found; 372 } 373 374 return true; 375 } 376 377 static bool assign_distribution(processorid_t* id_array, 378 uint id_length, 379 uint* distribution, 380 uint distribution_length) { 381 // We assume we can assign processorid_t's to uint's. 382 assert(sizeof(processorid_t) == sizeof(uint), 383 "can't convert processorid_t to uint"); 384 // Quick check to see if we won't succeed. 385 if (id_length < distribution_length) { 386 return false; 387 } 388 // Assign processor ids to the distribution. 389 // Try to shuffle processors to distribute work across boards, 390 // assuming 4 processors per board. 391 const uint processors_per_board = ProcessDistributionStride; 392 // Find the maximum processor id. 393 processorid_t max_id = 0; 394 for (uint m = 0; m < id_length; m += 1) { 395 max_id = MAX2(max_id, id_array[m]); 396 } 397 // The next id, to limit loops. 398 const processorid_t limit_id = max_id + 1; 399 // Make up markers for available processors. 400 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal); 401 for (uint c = 0; c < limit_id; c += 1) { 402 available_id[c] = false; 403 } 404 for (uint a = 0; a < id_length; a += 1) { 405 available_id[id_array[a]] = true; 406 } 407 // Step by "boards", then by "slot", copying to "assigned". 408 // NEEDS_CLEANUP: The assignment of processors should be stateful, 409 // remembering which processors have been assigned by 410 // previous calls, etc., so as to distribute several 411 // independent calls of this method. What we'd like is 412 // It would be nice to have an API that let us ask 413 // how many processes are bound to a processor, 414 // but we don't have that, either. 415 // In the short term, "board" is static so that 416 // subsequent distributions don't all start at board 0. 417 static uint board = 0; 418 uint assigned = 0; 419 // Until we've found enough processors .... 420 while (assigned < distribution_length) { 421 // ... find the next available processor in the board. 422 for (uint slot = 0; slot < processors_per_board; slot += 1) { 423 uint try_id = board * processors_per_board + slot; 424 if ((try_id < limit_id) && (available_id[try_id] == true)) { 425 distribution[assigned] = try_id; 426 available_id[try_id] = false; 427 assigned += 1; 428 break; 429 } 430 } 431 board += 1; 432 if (board * processors_per_board + 0 >= limit_id) { 433 board = 0; 434 } 435 } 436 if (available_id != NULL) { 437 FREE_C_HEAP_ARRAY(bool, available_id); 438 } 439 return true; 440 } 441 442 void os::set_native_thread_name(const char *name) { 443 if (Solaris::_pthread_setname_np != NULL) { 444 // Only the first 31 bytes of 'name' are processed by pthread_setname_np 445 // but we explicitly copy into a size-limited buffer to avoid any 446 // possible overflow. 447 char buf[32]; 448 snprintf(buf, sizeof(buf), "%s", name); 449 buf[sizeof(buf) - 1] = '\0'; 450 Solaris::_pthread_setname_np(pthread_self(), buf); 451 } 452 } 453 454 bool os::distribute_processes(uint length, uint* distribution) { 455 bool result = false; 456 // Find the processor id's of all the available CPUs. 457 processorid_t* id_array = NULL; 458 uint id_length = 0; 459 // There are some races between querying information and using it, 460 // since processor sets can change dynamically. 461 psetid_t pset = PS_NONE; 462 // Are we running in a processor set? 463 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) { 464 result = find_processors_in_pset(pset, &id_array, &id_length); 465 } else { 466 result = find_processors_online(&id_array, &id_length); 467 } 468 if (result == true) { 469 if (id_length >= length) { 470 result = assign_distribution(id_array, id_length, distribution, length); 471 } else { 472 result = false; 473 } 474 } 475 if (id_array != NULL) { 476 FREE_C_HEAP_ARRAY(processorid_t, id_array); 477 } 478 return result; 479 } 480 481 bool os::bind_to_processor(uint processor_id) { 482 // We assume that a processorid_t can be stored in a uint. 483 assert(sizeof(uint) == sizeof(processorid_t), 484 "can't convert uint to processorid_t"); 485 int bind_result = 486 processor_bind(P_LWPID, // bind LWP. 487 P_MYID, // bind current LWP. 488 (processorid_t) processor_id, // id. 489 NULL); // don't return old binding. 490 return (bind_result == 0); 491 } 492 493 // Return true if user is running as root. 494 495 bool os::have_special_privileges() { 496 static bool init = false; 497 static bool privileges = false; 498 if (!init) { 499 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 500 init = true; 501 } 502 return privileges; 503 } 504 505 506 void os::init_system_properties_values() { 507 // The next steps are taken in the product version: 508 // 509 // Obtain the JAVA_HOME value from the location of libjvm.so. 510 // This library should be located at: 511 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 512 // 513 // If "/jre/lib/" appears at the right place in the path, then we 514 // assume libjvm.so is installed in a JDK and we use this path. 515 // 516 // Otherwise exit with message: "Could not create the Java virtual machine." 517 // 518 // The following extra steps are taken in the debugging version: 519 // 520 // If "/jre/lib/" does NOT appear at the right place in the path 521 // instead of exit check for $JAVA_HOME environment variable. 522 // 523 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 524 // then we append a fake suffix "hotspot/libjvm.so" to this path so 525 // it looks like libjvm.so is installed there 526 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 527 // 528 // Otherwise exit. 529 // 530 // Important note: if the location of libjvm.so changes this 531 // code needs to be changed accordingly. 532 533 // Base path of extensions installed on the system. 534 #define SYS_EXT_DIR "/usr/jdk/packages" 535 #define EXTENSIONS_DIR "/lib/ext" 536 537 // Buffer that fits several sprintfs. 538 // Note that the space for the colon and the trailing null are provided 539 // by the nulls included by the sizeof operator. 540 const size_t bufsize = 541 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends. 542 sizeof(SYS_EXT_DIR) + sizeof("/lib/"), // invariant ld_library_path 543 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir 544 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 545 546 // sysclasspath, java_home, dll_dir 547 { 548 char *pslash; 549 os::jvm_path(buf, bufsize); 550 551 // Found the full path to libjvm.so. 552 // Now cut the path to <java_home>/jre if we can. 553 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 554 pslash = strrchr(buf, '/'); 555 if (pslash != NULL) { 556 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 557 } 558 Arguments::set_dll_dir(buf); 559 560 if (pslash != NULL) { 561 pslash = strrchr(buf, '/'); 562 if (pslash != NULL) { 563 *pslash = '\0'; // Get rid of /lib. 564 } 565 } 566 Arguments::set_java_home(buf); 567 set_boot_path('/', ':'); 568 } 569 570 // Where to look for native libraries. 571 { 572 // Use dlinfo() to determine the correct java.library.path. 573 // 574 // If we're launched by the Java launcher, and the user 575 // does not set java.library.path explicitly on the commandline, 576 // the Java launcher sets LD_LIBRARY_PATH for us and unsets 577 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case 578 // dlinfo returns LD_LIBRARY_PATH + crle settings (including 579 // /usr/lib), which is exactly what we want. 580 // 581 // If the user does set java.library.path, it completely 582 // overwrites this setting, and always has. 583 // 584 // If we're not launched by the Java launcher, we may 585 // get here with any/all of the LD_LIBRARY_PATH[_32|64] 586 // settings. Again, dlinfo does exactly what we want. 587 588 Dl_serinfo info_sz, *info = &info_sz; 589 Dl_serpath *path; 590 char *library_path; 591 char *common_path = buf; 592 593 // Determine search path count and required buffer size. 594 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) { 595 FREE_C_HEAP_ARRAY(char, buf); 596 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror()); 597 } 598 599 // Allocate new buffer and initialize. 600 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal); 601 info->dls_size = info_sz.dls_size; 602 info->dls_cnt = info_sz.dls_cnt; 603 604 // Obtain search path information. 605 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) { 606 FREE_C_HEAP_ARRAY(char, buf); 607 FREE_C_HEAP_ARRAY(char, info); 608 vm_exit_during_initialization("dlinfo SERINFO request", dlerror()); 609 } 610 611 path = &info->dls_serpath[0]; 612 613 // Note: Due to a legacy implementation, most of the library path 614 // is set in the launcher. This was to accomodate linking restrictions 615 // on legacy Solaris implementations (which are no longer supported). 616 // Eventually, all the library path setting will be done here. 617 // 618 // However, to prevent the proliferation of improperly built native 619 // libraries, the new path component /usr/jdk/packages is added here. 620 621 // Construct the invariant part of ld_library_path. 622 sprintf(common_path, SYS_EXT_DIR "/lib"); 623 624 // Struct size is more than sufficient for the path components obtained 625 // through the dlinfo() call, so only add additional space for the path 626 // components explicitly added here. 627 size_t library_path_size = info->dls_size + strlen(common_path); 628 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal); 629 library_path[0] = '\0'; 630 631 // Construct the desired Java library path from the linker's library 632 // search path. 633 // 634 // For compatibility, it is optimal that we insert the additional path 635 // components specific to the Java VM after those components specified 636 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so 637 // infrastructure. 638 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it. 639 strcpy(library_path, common_path); 640 } else { 641 int inserted = 0; 642 int i; 643 for (i = 0; i < info->dls_cnt; i++, path++) { 644 uint_t flags = path->dls_flags & LA_SER_MASK; 645 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) { 646 strcat(library_path, common_path); 647 strcat(library_path, os::path_separator()); 648 inserted = 1; 649 } 650 strcat(library_path, path->dls_name); 651 strcat(library_path, os::path_separator()); 652 } 653 // Eliminate trailing path separator. 654 library_path[strlen(library_path)-1] = '\0'; 655 } 656 657 // happens before argument parsing - can't use a trace flag 658 // tty->print_raw("init_system_properties_values: native lib path: "); 659 // tty->print_raw_cr(library_path); 660 661 // Callee copies into its own buffer. 662 Arguments::set_library_path(library_path); 663 664 FREE_C_HEAP_ARRAY(char, library_path); 665 FREE_C_HEAP_ARRAY(char, info); 666 } 667 668 // Extensions directories. 669 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); 670 Arguments::set_ext_dirs(buf); 671 672 FREE_C_HEAP_ARRAY(char, buf); 673 674 #undef SYS_EXT_DIR 675 #undef EXTENSIONS_DIR 676 } 677 678 void os::breakpoint() { 679 BREAKPOINT; 680 } 681 682 bool os::obsolete_option(const JavaVMOption *option) { 683 if (!strncmp(option->optionString, "-Xt", 3)) { 684 return true; 685 } else if (!strncmp(option->optionString, "-Xtm", 4)) { 686 return true; 687 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) { 688 return true; 689 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) { 690 return true; 691 } 692 return false; 693 } 694 695 bool os::Solaris::valid_stack_address(Thread* thread, address sp) { 696 address stackStart = (address)thread->stack_base(); 697 address stackEnd = (address)(stackStart - (address)thread->stack_size()); 698 if (sp < stackStart && sp >= stackEnd) return true; 699 return false; 700 } 701 702 extern "C" void breakpoint() { 703 // use debugger to set breakpoint here 704 } 705 706 static thread_t main_thread; 707 708 // Thread start routine for all newly created threads 709 extern "C" void* thread_native_entry(void* thread_addr) { 710 // Try to randomize the cache line index of hot stack frames. 711 // This helps when threads of the same stack traces evict each other's 712 // cache lines. The threads can be either from the same JVM instance, or 713 // from different JVM instances. The benefit is especially true for 714 // processors with hyperthreading technology. 715 static int counter = 0; 716 int pid = os::current_process_id(); 717 alloca(((pid ^ counter++) & 7) * 128); 718 719 int prio; 720 Thread* thread = (Thread*)thread_addr; 721 722 thread->initialize_thread_current(); 723 724 OSThread* osthr = thread->osthread(); 725 726 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound 727 thread->_schedctl = (void *) schedctl_init(); 728 729 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", 730 os::current_thread_id()); 731 732 if (UseNUMA) { 733 int lgrp_id = os::numa_get_group_id(); 734 if (lgrp_id != -1) { 735 thread->set_lgrp_id(lgrp_id); 736 } 737 } 738 739 // Our priority was set when we were created, and stored in the 740 // osthread, but couldn't be passed through to our LWP until now. 741 // So read back the priority and set it again. 742 743 if (osthr->thread_id() != -1) { 744 if (UseThreadPriorities) { 745 int prio = osthr->native_priority(); 746 if (ThreadPriorityVerbose) { 747 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " 748 INTPTR_FORMAT ", setting priority: %d\n", 749 osthr->thread_id(), osthr->lwp_id(), prio); 750 } 751 os::set_native_priority(thread, prio); 752 } 753 } else if (ThreadPriorityVerbose) { 754 warning("Can't set priority in _start routine, thread id hasn't been set\n"); 755 } 756 757 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 758 759 // initialize signal mask for this thread 760 os::Solaris::hotspot_sigmask(thread); 761 762 thread->run(); 763 764 // One less thread is executing 765 // When the VMThread gets here, the main thread may have already exited 766 // which frees the CodeHeap containing the Atomic::dec code 767 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 768 Atomic::dec(&os::Solaris::_os_thread_count); 769 } 770 771 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id()); 772 773 // If a thread has not deleted itself ("delete this") as part of its 774 // termination sequence, we have to ensure thread-local-storage is 775 // cleared before we actually terminate. No threads should ever be 776 // deleted asynchronously with respect to their termination. 777 if (Thread::current_or_null_safe() != NULL) { 778 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 779 thread->clear_thread_current(); 780 } 781 782 if (UseDetachedThreads) { 783 thr_exit(NULL); 784 ShouldNotReachHere(); 785 } 786 return NULL; 787 } 788 789 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) { 790 // Allocate the OSThread object 791 OSThread* osthread = new OSThread(NULL, NULL); 792 if (osthread == NULL) return NULL; 793 794 // Store info on the Solaris thread into the OSThread 795 osthread->set_thread_id(thread_id); 796 osthread->set_lwp_id(_lwp_self()); 797 thread->_schedctl = (void *) schedctl_init(); 798 799 if (UseNUMA) { 800 int lgrp_id = os::numa_get_group_id(); 801 if (lgrp_id != -1) { 802 thread->set_lgrp_id(lgrp_id); 803 } 804 } 805 806 if (ThreadPriorityVerbose) { 807 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n", 808 osthread->thread_id(), osthread->lwp_id()); 809 } 810 811 // Initial thread state is INITIALIZED, not SUSPENDED 812 osthread->set_state(INITIALIZED); 813 814 return osthread; 815 } 816 817 void os::Solaris::hotspot_sigmask(Thread* thread) { 818 //Save caller's signal mask 819 sigset_t sigmask; 820 pthread_sigmask(SIG_SETMASK, NULL, &sigmask); 821 OSThread *osthread = thread->osthread(); 822 osthread->set_caller_sigmask(sigmask); 823 824 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL); 825 if (!ReduceSignalUsage) { 826 if (thread->is_VM_thread()) { 827 // Only the VM thread handles BREAK_SIGNAL ... 828 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 829 } else { 830 // ... all other threads block BREAK_SIGNAL 831 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked"); 832 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 833 } 834 } 835 } 836 837 bool os::create_attached_thread(JavaThread* thread) { 838 #ifdef ASSERT 839 thread->verify_not_published(); 840 #endif 841 OSThread* osthread = create_os_thread(thread, thr_self()); 842 if (osthread == NULL) { 843 return false; 844 } 845 846 // Initial thread state is RUNNABLE 847 osthread->set_state(RUNNABLE); 848 thread->set_osthread(osthread); 849 850 // initialize signal mask for this thread 851 // and save the caller's signal mask 852 os::Solaris::hotspot_sigmask(thread); 853 854 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").", 855 os::current_thread_id()); 856 857 return true; 858 } 859 860 bool os::create_main_thread(JavaThread* thread) { 861 #ifdef ASSERT 862 thread->verify_not_published(); 863 #endif 864 if (_starting_thread == NULL) { 865 _starting_thread = create_os_thread(thread, main_thread); 866 if (_starting_thread == NULL) { 867 return false; 868 } 869 } 870 871 // The primodial thread is runnable from the start 872 _starting_thread->set_state(RUNNABLE); 873 874 thread->set_osthread(_starting_thread); 875 876 // initialize signal mask for this thread 877 // and save the caller's signal mask 878 os::Solaris::hotspot_sigmask(thread); 879 880 return true; 881 } 882 883 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr() 884 static char* describe_thr_create_attributes(char* buf, size_t buflen, 885 size_t stacksize, long flags) { 886 stringStream ss(buf, buflen); 887 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024); 888 ss.print("flags: "); 889 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " "); 890 #define ALL(X) \ 891 X(THR_SUSPENDED) \ 892 X(THR_DETACHED) \ 893 X(THR_BOUND) \ 894 X(THR_NEW_LWP) \ 895 X(THR_DAEMON) 896 ALL(PRINT_FLAG) 897 #undef ALL 898 #undef PRINT_FLAG 899 return buf; 900 } 901 902 // return default stack size for thr_type 903 size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 904 // default stack size when not specified by caller is 1M (2M for LP64) 905 size_t s = (BytesPerWord >> 2) * K * K; 906 return s; 907 } 908 909 bool os::create_thread(Thread* thread, ThreadType thr_type, 910 size_t req_stack_size) { 911 // Allocate the OSThread object 912 OSThread* osthread = new OSThread(NULL, NULL); 913 if (osthread == NULL) { 914 return false; 915 } 916 917 if (ThreadPriorityVerbose) { 918 char *thrtyp; 919 switch (thr_type) { 920 case vm_thread: 921 thrtyp = (char *)"vm"; 922 break; 923 case cgc_thread: 924 thrtyp = (char *)"cgc"; 925 break; 926 case pgc_thread: 927 thrtyp = (char *)"pgc"; 928 break; 929 case java_thread: 930 thrtyp = (char *)"java"; 931 break; 932 case compiler_thread: 933 thrtyp = (char *)"compiler"; 934 break; 935 case watcher_thread: 936 thrtyp = (char *)"watcher"; 937 break; 938 default: 939 thrtyp = (char *)"unknown"; 940 break; 941 } 942 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp); 943 } 944 945 // calculate stack size if it's not specified by caller 946 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 947 948 // Initial state is ALLOCATED but not INITIALIZED 949 osthread->set_state(ALLOCATED); 950 951 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) { 952 // We got lots of threads. Check if we still have some address space left. 953 // Need to be at least 5Mb of unreserved address space. We do check by 954 // trying to reserve some. 955 const size_t VirtualMemoryBangSize = 20*K*K; 956 char* mem = os::reserve_memory(VirtualMemoryBangSize); 957 if (mem == NULL) { 958 delete osthread; 959 return false; 960 } else { 961 // Release the memory again 962 os::release_memory(mem, VirtualMemoryBangSize); 963 } 964 } 965 966 // Setup osthread because the child thread may need it. 967 thread->set_osthread(osthread); 968 969 // Create the Solaris thread 970 thread_t tid = 0; 971 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED; 972 int status; 973 974 // Mark that we don't have an lwp or thread id yet. 975 // In case we attempt to set the priority before the thread starts. 976 osthread->set_lwp_id(-1); 977 osthread->set_thread_id(-1); 978 979 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid); 980 981 char buf[64]; 982 if (status == 0) { 983 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ", 984 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 985 } else { 986 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.", 987 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 988 } 989 990 if (status != 0) { 991 thread->set_osthread(NULL); 992 // Need to clean up stuff we've allocated so far 993 delete osthread; 994 return false; 995 } 996 997 Atomic::inc(&os::Solaris::_os_thread_count); 998 999 // Store info on the Solaris thread into the OSThread 1000 osthread->set_thread_id(tid); 1001 1002 // Remember that we created this thread so we can set priority on it 1003 osthread->set_vm_created(); 1004 1005 // Most thread types will set an explicit priority before starting the thread, 1006 // but for those that don't we need a valid value to read back in thread_native_entry. 1007 osthread->set_native_priority(NormPriority); 1008 1009 // Initial thread state is INITIALIZED, not SUSPENDED 1010 osthread->set_state(INITIALIZED); 1011 1012 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 1013 return true; 1014 } 1015 1016 debug_only(static bool signal_sets_initialized = false); 1017 static sigset_t unblocked_sigs, vm_sigs; 1018 1019 bool os::Solaris::is_sig_ignored(int sig) { 1020 struct sigaction oact; 1021 sigaction(sig, (struct sigaction*)NULL, &oact); 1022 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 1023 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 1024 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) { 1025 return true; 1026 } else { 1027 return false; 1028 } 1029 } 1030 1031 void os::Solaris::signal_sets_init() { 1032 // Should also have an assertion stating we are still single-threaded. 1033 assert(!signal_sets_initialized, "Already initialized"); 1034 // Fill in signals that are necessarily unblocked for all threads in 1035 // the VM. Currently, we unblock the following signals: 1036 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 1037 // by -Xrs (=ReduceSignalUsage)); 1038 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 1039 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 1040 // the dispositions or masks wrt these signals. 1041 // Programs embedding the VM that want to use the above signals for their 1042 // own purposes must, at this time, use the "-Xrs" option to prevent 1043 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 1044 // (See bug 4345157, and other related bugs). 1045 // In reality, though, unblocking these signals is really a nop, since 1046 // these signals are not blocked by default. 1047 sigemptyset(&unblocked_sigs); 1048 sigaddset(&unblocked_sigs, SIGILL); 1049 sigaddset(&unblocked_sigs, SIGSEGV); 1050 sigaddset(&unblocked_sigs, SIGBUS); 1051 sigaddset(&unblocked_sigs, SIGFPE); 1052 sigaddset(&unblocked_sigs, ASYNC_SIGNAL); 1053 1054 if (!ReduceSignalUsage) { 1055 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 1056 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 1057 } 1058 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 1059 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 1060 } 1061 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 1062 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 1063 } 1064 } 1065 // Fill in signals that are blocked by all but the VM thread. 1066 sigemptyset(&vm_sigs); 1067 if (!ReduceSignalUsage) { 1068 sigaddset(&vm_sigs, BREAK_SIGNAL); 1069 } 1070 debug_only(signal_sets_initialized = true); 1071 1072 // For diagnostics only used in run_periodic_checks 1073 sigemptyset(&check_signal_done); 1074 } 1075 1076 // These are signals that are unblocked while a thread is running Java. 1077 // (For some reason, they get blocked by default.) 1078 sigset_t* os::Solaris::unblocked_signals() { 1079 assert(signal_sets_initialized, "Not initialized"); 1080 return &unblocked_sigs; 1081 } 1082 1083 // These are the signals that are blocked while a (non-VM) thread is 1084 // running Java. Only the VM thread handles these signals. 1085 sigset_t* os::Solaris::vm_signals() { 1086 assert(signal_sets_initialized, "Not initialized"); 1087 return &vm_sigs; 1088 } 1089 1090 void _handle_uncaught_cxx_exception() { 1091 VMError::report_and_die("An uncaught C++ exception"); 1092 } 1093 1094 1095 // First crack at OS-specific initialization, from inside the new thread. 1096 void os::initialize_thread(Thread* thr) { 1097 int r = thr_main(); 1098 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 1099 if (r) { 1100 JavaThread* jt = (JavaThread *)thr; 1101 assert(jt != NULL, "Sanity check"); 1102 size_t stack_size; 1103 address base = jt->stack_base(); 1104 if (Arguments::created_by_java_launcher()) { 1105 // Use 2MB to allow for Solaris 7 64 bit mode. 1106 stack_size = JavaThread::stack_size_at_create() == 0 1107 ? 2048*K : JavaThread::stack_size_at_create(); 1108 1109 // There are rare cases when we may have already used more than 1110 // the basic stack size allotment before this method is invoked. 1111 // Attempt to allow for a normally sized java_stack. 1112 size_t current_stack_offset = (size_t)(base - (address)&stack_size); 1113 stack_size += ReservedSpace::page_align_size_down(current_stack_offset); 1114 } else { 1115 // 6269555: If we were not created by a Java launcher, i.e. if we are 1116 // running embedded in a native application, treat the primordial thread 1117 // as much like a native attached thread as possible. This means using 1118 // the current stack size from thr_stksegment(), unless it is too large 1119 // to reliably setup guard pages. A reasonable max size is 8MB. 1120 size_t current_size = current_stack_size(); 1121 // This should never happen, but just in case.... 1122 if (current_size == 0) current_size = 2 * K * K; 1123 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size; 1124 } 1125 address bottom = align_up(base - stack_size, os::vm_page_size());; 1126 stack_size = (size_t)(base - bottom); 1127 1128 assert(stack_size > 0, "Stack size calculation problem"); 1129 1130 if (stack_size > jt->stack_size()) { 1131 #ifndef PRODUCT 1132 struct rlimit limits; 1133 getrlimit(RLIMIT_STACK, &limits); 1134 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur); 1135 assert(size >= jt->stack_size(), "Stack size problem in main thread"); 1136 #endif 1137 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n" 1138 "(Stack sizes are rounded up to a multiple of the system page size.)\n" 1139 "See limit(1) to increase the stack size limit.", 1140 stack_size / K, jt->stack_size() / K); 1141 vm_exit(1); 1142 } 1143 assert(jt->stack_size() >= stack_size, 1144 "Attempt to map more stack than was allocated"); 1145 jt->set_stack_size(stack_size); 1146 } 1147 1148 // With the T2 libthread (T1 is no longer supported) threads are always bound 1149 // and we use stackbanging in all cases. 1150 1151 os::Solaris::init_thread_fpu_state(); 1152 std::set_terminate(_handle_uncaught_cxx_exception); 1153 } 1154 1155 1156 1157 // Free Solaris resources related to the OSThread 1158 void os::free_thread(OSThread* osthread) { 1159 assert(osthread != NULL, "os::free_thread but osthread not set"); 1160 1161 // We are told to free resources of the argument thread, 1162 // but we can only really operate on the current thread. 1163 assert(Thread::current()->osthread() == osthread, 1164 "os::free_thread but not current thread"); 1165 1166 // Restore caller's signal mask 1167 sigset_t sigmask = osthread->caller_sigmask(); 1168 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 1169 1170 delete osthread; 1171 } 1172 1173 void os::pd_start_thread(Thread* thread) { 1174 int status = thr_continue(thread->osthread()->thread_id()); 1175 assert_status(status == 0, status, "thr_continue failed"); 1176 } 1177 1178 1179 intx os::current_thread_id() { 1180 return (intx)thr_self(); 1181 } 1182 1183 static pid_t _initial_pid = 0; 1184 1185 int os::current_process_id() { 1186 return (int)(_initial_pid ? _initial_pid : getpid()); 1187 } 1188 1189 // gethrtime() should be monotonic according to the documentation, 1190 // but some virtualized platforms are known to break this guarantee. 1191 // getTimeNanos() must be guaranteed not to move backwards, so we 1192 // are forced to add a check here. 1193 inline hrtime_t getTimeNanos() { 1194 const hrtime_t now = gethrtime(); 1195 const hrtime_t prev = max_hrtime; 1196 if (now <= prev) { 1197 return prev; // same or retrograde time; 1198 } 1199 const hrtime_t obsv = Atomic::cmpxchg(now, &max_hrtime, prev); 1200 assert(obsv >= prev, "invariant"); // Monotonicity 1201 // If the CAS succeeded then we're done and return "now". 1202 // If the CAS failed and the observed value "obsv" is >= now then 1203 // we should return "obsv". If the CAS failed and now > obsv > prv then 1204 // some other thread raced this thread and installed a new value, in which case 1205 // we could either (a) retry the entire operation, (b) retry trying to install now 1206 // or (c) just return obsv. We use (c). No loop is required although in some cases 1207 // we might discard a higher "now" value in deference to a slightly lower but freshly 1208 // installed obsv value. That's entirely benign -- it admits no new orderings compared 1209 // to (a) or (b) -- and greatly reduces coherence traffic. 1210 // We might also condition (c) on the magnitude of the delta between obsv and now. 1211 // Avoiding excessive CAS operations to hot RW locations is critical. 1212 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 1213 return (prev == obsv) ? now : obsv; 1214 } 1215 1216 // Time since start-up in seconds to a fine granularity. 1217 // Used by VMSelfDestructTimer and the MemProfiler. 1218 double os::elapsedTime() { 1219 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1220 } 1221 1222 jlong os::elapsed_counter() { 1223 return (jlong)(getTimeNanos() - first_hrtime); 1224 } 1225 1226 jlong os::elapsed_frequency() { 1227 return hrtime_hz; 1228 } 1229 1230 // Return the real, user, and system times in seconds from an 1231 // arbitrary fixed point in the past. 1232 bool os::getTimesSecs(double* process_real_time, 1233 double* process_user_time, 1234 double* process_system_time) { 1235 struct tms ticks; 1236 clock_t real_ticks = times(&ticks); 1237 1238 if (real_ticks == (clock_t) (-1)) { 1239 return false; 1240 } else { 1241 double ticks_per_second = (double) clock_tics_per_sec; 1242 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1243 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1244 // For consistency return the real time from getTimeNanos() 1245 // converted to seconds. 1246 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); 1247 1248 return true; 1249 } 1250 } 1251 1252 bool os::supports_vtime() { return true; } 1253 bool os::enable_vtime() { return false; } 1254 bool os::vtime_enabled() { return false; } 1255 1256 double os::elapsedVTime() { 1257 return (double)gethrvtime() / (double)hrtime_hz; 1258 } 1259 1260 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 1261 jlong os::javaTimeMillis() { 1262 timeval t; 1263 if (gettimeofday(&t, NULL) == -1) { 1264 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno)); 1265 } 1266 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; 1267 } 1268 1269 // Must return seconds+nanos since Jan 1 1970. This must use the same 1270 // time source as javaTimeMillis and can't use get_nsec_fromepoch as 1271 // we need better than 1ms accuracy 1272 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 1273 timeval t; 1274 if (gettimeofday(&t, NULL) == -1) { 1275 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno)); 1276 } 1277 seconds = jlong(t.tv_sec); 1278 nanos = jlong(t.tv_usec) * 1000; 1279 } 1280 1281 1282 jlong os::javaTimeNanos() { 1283 return (jlong)getTimeNanos(); 1284 } 1285 1286 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1287 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits 1288 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1289 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1290 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1291 } 1292 1293 char * os::local_time_string(char *buf, size_t buflen) { 1294 struct tm t; 1295 time_t long_time; 1296 time(&long_time); 1297 localtime_r(&long_time, &t); 1298 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1299 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1300 t.tm_hour, t.tm_min, t.tm_sec); 1301 return buf; 1302 } 1303 1304 // Note: os::shutdown() might be called very early during initialization, or 1305 // called from signal handler. Before adding something to os::shutdown(), make 1306 // sure it is async-safe and can handle partially initialized VM. 1307 void os::shutdown() { 1308 1309 // allow PerfMemory to attempt cleanup of any persistent resources 1310 perfMemory_exit(); 1311 1312 // needs to remove object in file system 1313 AttachListener::abort(); 1314 1315 // flush buffered output, finish log files 1316 ostream_abort(); 1317 1318 // Check for abort hook 1319 abort_hook_t abort_hook = Arguments::abort_hook(); 1320 if (abort_hook != NULL) { 1321 abort_hook(); 1322 } 1323 } 1324 1325 // Note: os::abort() might be called very early during initialization, or 1326 // called from signal handler. Before adding something to os::abort(), make 1327 // sure it is async-safe and can handle partially initialized VM. 1328 void os::abort(bool dump_core, void* siginfo, const void* context) { 1329 os::shutdown(); 1330 if (dump_core) { 1331 #ifndef PRODUCT 1332 fdStream out(defaultStream::output_fd()); 1333 out.print_raw("Current thread is "); 1334 char buf[16]; 1335 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1336 out.print_raw_cr(buf); 1337 out.print_raw_cr("Dumping core ..."); 1338 #endif 1339 ::abort(); // dump core (for debugging) 1340 } 1341 1342 ::exit(1); 1343 } 1344 1345 // Die immediately, no exit hook, no abort hook, no cleanup. 1346 void os::die() { 1347 ::abort(); // dump core (for debugging) 1348 } 1349 1350 // DLL functions 1351 1352 const char* os::dll_file_extension() { return ".so"; } 1353 1354 // This must be hard coded because it's the system's temporary 1355 // directory not the java application's temp directory, ala java.io.tmpdir. 1356 const char* os::get_temp_directory() { return "/tmp"; } 1357 1358 // check if addr is inside libjvm.so 1359 bool os::address_is_in_vm(address addr) { 1360 static address libjvm_base_addr; 1361 Dl_info dlinfo; 1362 1363 if (libjvm_base_addr == NULL) { 1364 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1365 libjvm_base_addr = (address)dlinfo.dli_fbase; 1366 } 1367 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1368 } 1369 1370 if (dladdr((void *)addr, &dlinfo) != 0) { 1371 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1372 } 1373 1374 return false; 1375 } 1376 1377 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int); 1378 static dladdr1_func_type dladdr1_func = NULL; 1379 1380 bool os::dll_address_to_function_name(address addr, char *buf, 1381 int buflen, int * offset, 1382 bool demangle) { 1383 // buf is not optional, but offset is optional 1384 assert(buf != NULL, "sanity check"); 1385 1386 Dl_info dlinfo; 1387 1388 // dladdr1_func was initialized in os::init() 1389 if (dladdr1_func != NULL) { 1390 // yes, we have dladdr1 1391 1392 // Support for dladdr1 is checked at runtime; it may be 1393 // available even if the vm is built on a machine that does 1394 // not have dladdr1 support. Make sure there is a value for 1395 // RTLD_DL_SYMENT. 1396 #ifndef RTLD_DL_SYMENT 1397 #define RTLD_DL_SYMENT 1 1398 #endif 1399 #ifdef _LP64 1400 Elf64_Sym * info; 1401 #else 1402 Elf32_Sym * info; 1403 #endif 1404 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1405 RTLD_DL_SYMENT) != 0) { 1406 // see if we have a matching symbol that covers our address 1407 if (dlinfo.dli_saddr != NULL && 1408 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) { 1409 if (dlinfo.dli_sname != NULL) { 1410 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1411 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1412 } 1413 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1414 return true; 1415 } 1416 } 1417 // no matching symbol so try for just file info 1418 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1419 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1420 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1421 return true; 1422 } 1423 } 1424 } 1425 buf[0] = '\0'; 1426 if (offset != NULL) *offset = -1; 1427 return false; 1428 } 1429 1430 // no, only dladdr is available 1431 if (dladdr((void *)addr, &dlinfo) != 0) { 1432 // see if we have a matching symbol 1433 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1434 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1435 jio_snprintf(buf, buflen, dlinfo.dli_sname); 1436 } 1437 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1438 return true; 1439 } 1440 // no matching symbol so try for just file info 1441 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1442 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1443 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1444 return true; 1445 } 1446 } 1447 } 1448 buf[0] = '\0'; 1449 if (offset != NULL) *offset = -1; 1450 return false; 1451 } 1452 1453 bool os::dll_address_to_library_name(address addr, char* buf, 1454 int buflen, int* offset) { 1455 // buf is not optional, but offset is optional 1456 assert(buf != NULL, "sanity check"); 1457 1458 Dl_info dlinfo; 1459 1460 if (dladdr((void*)addr, &dlinfo) != 0) { 1461 if (dlinfo.dli_fname != NULL) { 1462 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1463 } 1464 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1465 *offset = addr - (address)dlinfo.dli_fbase; 1466 } 1467 return true; 1468 } 1469 1470 buf[0] = '\0'; 1471 if (offset) *offset = -1; 1472 return false; 1473 } 1474 1475 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1476 Dl_info dli; 1477 // Sanity check? 1478 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 || 1479 dli.dli_fname == NULL) { 1480 return 1; 1481 } 1482 1483 void * handle = dlopen(dli.dli_fname, RTLD_LAZY); 1484 if (handle == NULL) { 1485 return 1; 1486 } 1487 1488 Link_map *map; 1489 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1490 if (map == NULL) { 1491 dlclose(handle); 1492 return 1; 1493 } 1494 1495 while (map->l_prev != NULL) { 1496 map = map->l_prev; 1497 } 1498 1499 while (map != NULL) { 1500 // Iterate through all map entries and call callback with fields of interest 1501 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1502 dlclose(handle); 1503 return 1; 1504 } 1505 map = map->l_next; 1506 } 1507 1508 dlclose(handle); 1509 return 0; 1510 } 1511 1512 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1513 outputStream * out = (outputStream *) param; 1514 out->print_cr(PTR_FORMAT " \t%s", base_address, name); 1515 return 0; 1516 } 1517 1518 void os::print_dll_info(outputStream * st) { 1519 st->print_cr("Dynamic libraries:"); st->flush(); 1520 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1521 st->print_cr("Error: Cannot print dynamic libraries."); 1522 } 1523 } 1524 1525 // Loads .dll/.so and 1526 // in case of error it checks if .dll/.so was built for the 1527 // same architecture as Hotspot is running on 1528 1529 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1530 void * result= ::dlopen(filename, RTLD_LAZY); 1531 if (result != NULL) { 1532 // Successful loading 1533 return result; 1534 } 1535 1536 Elf32_Ehdr elf_head; 1537 1538 // Read system error message into ebuf 1539 // It may or may not be overwritten below 1540 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1541 ebuf[ebuflen-1]='\0'; 1542 int diag_msg_max_length=ebuflen-strlen(ebuf); 1543 char* diag_msg_buf=ebuf+strlen(ebuf); 1544 1545 if (diag_msg_max_length==0) { 1546 // No more space in ebuf for additional diagnostics message 1547 return NULL; 1548 } 1549 1550 1551 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1552 1553 if (file_descriptor < 0) { 1554 // Can't open library, report dlerror() message 1555 return NULL; 1556 } 1557 1558 bool failed_to_read_elf_head= 1559 (sizeof(elf_head)!= 1560 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1561 1562 ::close(file_descriptor); 1563 if (failed_to_read_elf_head) { 1564 // file i/o error - report dlerror() msg 1565 return NULL; 1566 } 1567 1568 typedef struct { 1569 Elf32_Half code; // Actual value as defined in elf.h 1570 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1571 char elf_class; // 32 or 64 bit 1572 char endianess; // MSB or LSB 1573 char* name; // String representation 1574 } arch_t; 1575 1576 static const arch_t arch_array[]={ 1577 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1578 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1579 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1580 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1581 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1582 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1583 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1584 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1585 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1586 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"} 1587 }; 1588 1589 #if (defined IA32) 1590 static Elf32_Half running_arch_code=EM_386; 1591 #elif (defined AMD64) 1592 static Elf32_Half running_arch_code=EM_X86_64; 1593 #elif (defined IA64) 1594 static Elf32_Half running_arch_code=EM_IA_64; 1595 #elif (defined __sparc) && (defined _LP64) 1596 static Elf32_Half running_arch_code=EM_SPARCV9; 1597 #elif (defined __sparc) && (!defined _LP64) 1598 static Elf32_Half running_arch_code=EM_SPARC; 1599 #elif (defined __powerpc64__) 1600 static Elf32_Half running_arch_code=EM_PPC64; 1601 #elif (defined __powerpc__) 1602 static Elf32_Half running_arch_code=EM_PPC; 1603 #elif (defined ARM) 1604 static Elf32_Half running_arch_code=EM_ARM; 1605 #else 1606 #error Method os::dll_load requires that one of following is defined:\ 1607 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM 1608 #endif 1609 1610 // Identify compatability class for VM's architecture and library's architecture 1611 // Obtain string descriptions for architectures 1612 1613 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1614 int running_arch_index=-1; 1615 1616 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1617 if (running_arch_code == arch_array[i].code) { 1618 running_arch_index = i; 1619 } 1620 if (lib_arch.code == arch_array[i].code) { 1621 lib_arch.compat_class = arch_array[i].compat_class; 1622 lib_arch.name = arch_array[i].name; 1623 } 1624 } 1625 1626 assert(running_arch_index != -1, 1627 "Didn't find running architecture code (running_arch_code) in arch_array"); 1628 if (running_arch_index == -1) { 1629 // Even though running architecture detection failed 1630 // we may still continue with reporting dlerror() message 1631 return NULL; 1632 } 1633 1634 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1635 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1636 return NULL; 1637 } 1638 1639 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1640 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1641 return NULL; 1642 } 1643 1644 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1645 if (lib_arch.name!=NULL) { 1646 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1647 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1648 lib_arch.name, arch_array[running_arch_index].name); 1649 } else { 1650 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1651 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1652 lib_arch.code, 1653 arch_array[running_arch_index].name); 1654 } 1655 } 1656 1657 return NULL; 1658 } 1659 1660 void* os::dll_lookup(void* handle, const char* name) { 1661 return dlsym(handle, name); 1662 } 1663 1664 void* os::get_default_process_handle() { 1665 return (void*)::dlopen(NULL, RTLD_LAZY); 1666 } 1667 1668 int os::stat(const char *path, struct stat *sbuf) { 1669 char pathbuf[MAX_PATH]; 1670 if (strlen(path) > MAX_PATH - 1) { 1671 errno = ENAMETOOLONG; 1672 return -1; 1673 } 1674 os::native_path(strcpy(pathbuf, path)); 1675 return ::stat(pathbuf, sbuf); 1676 } 1677 1678 static inline time_t get_mtime(const char* filename) { 1679 struct stat st; 1680 int ret = os::stat(filename, &st); 1681 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 1682 return st.st_mtime; 1683 } 1684 1685 int os::compare_file_modified_times(const char* file1, const char* file2) { 1686 time_t t1 = get_mtime(file1); 1687 time_t t2 = get_mtime(file2); 1688 return t1 - t2; 1689 } 1690 1691 static bool _print_ascii_file(const char* filename, outputStream* st) { 1692 int fd = ::open(filename, O_RDONLY); 1693 if (fd == -1) { 1694 return false; 1695 } 1696 1697 char buf[32]; 1698 int bytes; 1699 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1700 st->print_raw(buf, bytes); 1701 } 1702 1703 ::close(fd); 1704 1705 return true; 1706 } 1707 1708 void os::print_os_info_brief(outputStream* st) { 1709 os::Solaris::print_distro_info(st); 1710 1711 os::Posix::print_uname_info(st); 1712 1713 os::Solaris::print_libversion_info(st); 1714 } 1715 1716 void os::print_os_info(outputStream* st) { 1717 st->print("OS:"); 1718 1719 os::Solaris::print_distro_info(st); 1720 1721 os::Posix::print_uname_info(st); 1722 1723 os::Solaris::print_libversion_info(st); 1724 1725 os::Posix::print_rlimit_info(st); 1726 1727 os::Posix::print_load_average(st); 1728 } 1729 1730 void os::Solaris::print_distro_info(outputStream* st) { 1731 if (!_print_ascii_file("/etc/release", st)) { 1732 st->print("Solaris"); 1733 } 1734 st->cr(); 1735 } 1736 1737 void os::get_summary_os_info(char* buf, size_t buflen) { 1738 strncpy(buf, "Solaris", buflen); // default to plain solaris 1739 FILE* fp = fopen("/etc/release", "r"); 1740 if (fp != NULL) { 1741 char tmp[256]; 1742 // Only get the first line and chop out everything but the os name. 1743 if (fgets(tmp, sizeof(tmp), fp)) { 1744 char* ptr = tmp; 1745 // skip past whitespace characters 1746 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++; 1747 if (*ptr != '\0') { 1748 char* nl = strchr(ptr, '\n'); 1749 if (nl != NULL) *nl = '\0'; 1750 strncpy(buf, ptr, buflen); 1751 } 1752 } 1753 fclose(fp); 1754 } 1755 } 1756 1757 void os::Solaris::print_libversion_info(outputStream* st) { 1758 st->print(" (T2 libthread)"); 1759 st->cr(); 1760 } 1761 1762 static bool check_addr0(outputStream* st) { 1763 jboolean status = false; 1764 const int read_chunk = 200; 1765 int ret = 0; 1766 int nmap = 0; 1767 int fd = ::open("/proc/self/map",O_RDONLY); 1768 if (fd >= 0) { 1769 prmap_t *p = NULL; 1770 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t)); 1771 if (NULL == mbuff) { 1772 ::close(fd); 1773 return status; 1774 } 1775 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) { 1776 //check if read() has not read partial data 1777 if( 0 != ret % sizeof(prmap_t)){ 1778 break; 1779 } 1780 nmap = ret / sizeof(prmap_t); 1781 p = (prmap_t *)mbuff; 1782 for(int i = 0; i < nmap; i++){ 1783 if (p->pr_vaddr == 0x0) { 1784 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024); 1785 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname); 1786 st->print("Access: "); 1787 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-"); 1788 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-"); 1789 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-"); 1790 st->cr(); 1791 status = true; 1792 } 1793 p++; 1794 } 1795 } 1796 free(mbuff); 1797 ::close(fd); 1798 } 1799 return status; 1800 } 1801 1802 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1803 // Get MHz with system call. We don't seem to already have this. 1804 processor_info_t stats; 1805 processorid_t id = getcpuid(); 1806 int clock = 0; 1807 if (processor_info(id, &stats) != -1) { 1808 clock = stats.pi_clock; // pi_processor_type isn't more informative than below 1809 } 1810 #ifdef AMD64 1811 snprintf(buf, buflen, "x86 64 bit %d MHz", clock); 1812 #else 1813 // must be sparc 1814 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock); 1815 #endif 1816 } 1817 1818 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1819 // Nothing to do for now. 1820 } 1821 1822 void os::print_memory_info(outputStream* st) { 1823 st->print("Memory:"); 1824 st->print(" %dk page", os::vm_page_size()>>10); 1825 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 1826 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 1827 st->cr(); 1828 (void) check_addr0(st); 1829 } 1830 1831 // Moved from whole group, because we need them here for diagnostic 1832 // prints. 1833 static int Maxsignum = 0; 1834 static int *ourSigFlags = NULL; 1835 1836 int os::Solaris::get_our_sigflags(int sig) { 1837 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1838 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1839 return ourSigFlags[sig]; 1840 } 1841 1842 void os::Solaris::set_our_sigflags(int sig, int flags) { 1843 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1844 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1845 ourSigFlags[sig] = flags; 1846 } 1847 1848 1849 static const char* get_signal_handler_name(address handler, 1850 char* buf, int buflen) { 1851 int offset; 1852 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 1853 if (found) { 1854 // skip directory names 1855 const char *p1, *p2; 1856 p1 = buf; 1857 size_t len = strlen(os::file_separator()); 1858 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 1859 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 1860 } else { 1861 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 1862 } 1863 return buf; 1864 } 1865 1866 static void print_signal_handler(outputStream* st, int sig, 1867 char* buf, size_t buflen) { 1868 struct sigaction sa; 1869 1870 sigaction(sig, NULL, &sa); 1871 1872 st->print("%s: ", os::exception_name(sig, buf, buflen)); 1873 1874 address handler = (sa.sa_flags & SA_SIGINFO) 1875 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 1876 : CAST_FROM_FN_PTR(address, sa.sa_handler); 1877 1878 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 1879 st->print("SIG_DFL"); 1880 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 1881 st->print("SIG_IGN"); 1882 } else { 1883 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 1884 } 1885 1886 st->print(", sa_mask[0]="); 1887 os::Posix::print_signal_set_short(st, &sa.sa_mask); 1888 1889 address rh = VMError::get_resetted_sighandler(sig); 1890 // May be, handler was resetted by VMError? 1891 if (rh != NULL) { 1892 handler = rh; 1893 sa.sa_flags = VMError::get_resetted_sigflags(sig); 1894 } 1895 1896 st->print(", sa_flags="); 1897 os::Posix::print_sa_flags(st, sa.sa_flags); 1898 1899 // Check: is it our handler? 1900 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) { 1901 // It is our signal handler 1902 // check for flags 1903 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 1904 st->print( 1905 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 1906 os::Solaris::get_our_sigflags(sig)); 1907 } 1908 } 1909 st->cr(); 1910 } 1911 1912 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1913 st->print_cr("Signal Handlers:"); 1914 print_signal_handler(st, SIGSEGV, buf, buflen); 1915 print_signal_handler(st, SIGBUS , buf, buflen); 1916 print_signal_handler(st, SIGFPE , buf, buflen); 1917 print_signal_handler(st, SIGPIPE, buf, buflen); 1918 print_signal_handler(st, SIGXFSZ, buf, buflen); 1919 print_signal_handler(st, SIGILL , buf, buflen); 1920 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 1921 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1922 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 1923 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1924 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 1925 } 1926 1927 static char saved_jvm_path[MAXPATHLEN] = { 0 }; 1928 1929 // Find the full path to the current module, libjvm.so 1930 void os::jvm_path(char *buf, jint buflen) { 1931 // Error checking. 1932 if (buflen < MAXPATHLEN) { 1933 assert(false, "must use a large-enough buffer"); 1934 buf[0] = '\0'; 1935 return; 1936 } 1937 // Lazy resolve the path to current module. 1938 if (saved_jvm_path[0] != 0) { 1939 strcpy(buf, saved_jvm_path); 1940 return; 1941 } 1942 1943 Dl_info dlinfo; 1944 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 1945 assert(ret != 0, "cannot locate libjvm"); 1946 if (ret != 0 && dlinfo.dli_fname != NULL) { 1947 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) { 1948 return; 1949 } 1950 } else { 1951 buf[0] = '\0'; 1952 return; 1953 } 1954 1955 if (Arguments::sun_java_launcher_is_altjvm()) { 1956 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1957 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". 1958 // If "/jre/lib/" appears at the right place in the string, then 1959 // assume we are installed in a JDK and we're done. Otherwise, check 1960 // for a JAVA_HOME environment variable and fix up the path so it 1961 // looks like libjvm.so is installed there (append a fake suffix 1962 // hotspot/libjvm.so). 1963 const char *p = buf + strlen(buf) - 1; 1964 for (int count = 0; p > buf && count < 5; ++count) { 1965 for (--p; p > buf && *p != '/'; --p) 1966 /* empty */ ; 1967 } 1968 1969 if (strncmp(p, "/jre/lib/", 9) != 0) { 1970 // Look for JAVA_HOME in the environment. 1971 char* java_home_var = ::getenv("JAVA_HOME"); 1972 if (java_home_var != NULL && java_home_var[0] != 0) { 1973 char* jrelib_p; 1974 int len; 1975 1976 // Check the current module name "libjvm.so". 1977 p = strrchr(buf, '/'); 1978 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1979 1980 if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) { 1981 return; 1982 } 1983 // determine if this is a legacy image or modules image 1984 // modules image doesn't have "jre" subdirectory 1985 len = strlen(buf); 1986 assert(len < buflen, "Ran out of buffer space"); 1987 jrelib_p = buf + len; 1988 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1989 if (0 != access(buf, F_OK)) { 1990 snprintf(jrelib_p, buflen-len, "/lib"); 1991 } 1992 1993 if (0 == access(buf, F_OK)) { 1994 // Use current module name "libjvm.so" 1995 len = strlen(buf); 1996 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 1997 } else { 1998 // Go back to path of .so 1999 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) { 2000 return; 2001 } 2002 } 2003 } 2004 } 2005 } 2006 2007 strncpy(saved_jvm_path, buf, MAXPATHLEN); 2008 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 2009 } 2010 2011 2012 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2013 // no prefix required, not even "_" 2014 } 2015 2016 2017 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2018 // no suffix required 2019 } 2020 2021 // This method is a copy of JDK's sysGetLastErrorString 2022 // from src/solaris/hpi/src/system_md.c 2023 2024 size_t os::lasterror(char *buf, size_t len) { 2025 if (errno == 0) return 0; 2026 2027 const char *s = os::strerror(errno); 2028 size_t n = ::strlen(s); 2029 if (n >= len) { 2030 n = len - 1; 2031 } 2032 ::strncpy(buf, s, n); 2033 buf[n] = '\0'; 2034 return n; 2035 } 2036 2037 2038 // sun.misc.Signal 2039 2040 extern "C" { 2041 static void UserHandler(int sig, void *siginfo, void *context) { 2042 // Ctrl-C is pressed during error reporting, likely because the error 2043 // handler fails to abort. Let VM die immediately. 2044 if (sig == SIGINT && VMError::is_error_reported()) { 2045 os::die(); 2046 } 2047 2048 os::signal_notify(sig); 2049 // We do not need to reinstate the signal handler each time... 2050 } 2051 } 2052 2053 void* os::user_handler() { 2054 return CAST_FROM_FN_PTR(void*, UserHandler); 2055 } 2056 2057 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) { 2058 struct timespec ts; 2059 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 2060 2061 return ts; 2062 } 2063 2064 extern "C" { 2065 typedef void (*sa_handler_t)(int); 2066 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2067 } 2068 2069 void* os::signal(int signal_number, void* handler) { 2070 struct sigaction sigAct, oldSigAct; 2071 sigfillset(&(sigAct.sa_mask)); 2072 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 2073 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2074 2075 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 2076 // -1 means registration failed 2077 return (void *)-1; 2078 } 2079 2080 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2081 } 2082 2083 void os::signal_raise(int signal_number) { 2084 raise(signal_number); 2085 } 2086 2087 // The following code is moved from os.cpp for making this 2088 // code platform specific, which it is by its very nature. 2089 2090 // a counter for each possible signal value 2091 static int Sigexit = 0; 2092 static jint *pending_signals = NULL; 2093 static int *preinstalled_sigs = NULL; 2094 static struct sigaction *chainedsigactions = NULL; 2095 static sema_t sig_sem; 2096 typedef int (*version_getting_t)(); 2097 version_getting_t os::Solaris::get_libjsig_version = NULL; 2098 2099 int os::sigexitnum_pd() { 2100 assert(Sigexit > 0, "signal memory not yet initialized"); 2101 return Sigexit; 2102 } 2103 2104 void os::Solaris::init_signal_mem() { 2105 // Initialize signal structures 2106 Maxsignum = SIGRTMAX; 2107 Sigexit = Maxsignum+1; 2108 assert(Maxsignum >0, "Unable to obtain max signal number"); 2109 2110 // pending_signals has one int per signal 2111 // The additional signal is for SIGEXIT - exit signal to signal_thread 2112 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); 2113 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 2114 2115 if (UseSignalChaining) { 2116 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 2117 * (Maxsignum + 1), mtInternal); 2118 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 2119 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2120 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 2121 } 2122 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2123 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 2124 } 2125 2126 void os::signal_init_pd() { 2127 int ret; 2128 2129 ret = ::sema_init(&sig_sem, 0, NULL, NULL); 2130 assert(ret == 0, "sema_init() failed"); 2131 } 2132 2133 void os::signal_notify(int signal_number) { 2134 int ret; 2135 2136 Atomic::inc(&pending_signals[signal_number]); 2137 ret = ::sema_post(&sig_sem); 2138 assert(ret == 0, "sema_post() failed"); 2139 } 2140 2141 static int check_pending_signals(bool wait_for_signal) { 2142 int ret; 2143 while (true) { 2144 for (int i = 0; i < Sigexit + 1; i++) { 2145 jint n = pending_signals[i]; 2146 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2147 return i; 2148 } 2149 } 2150 if (!wait_for_signal) { 2151 return -1; 2152 } 2153 JavaThread *thread = JavaThread::current(); 2154 ThreadBlockInVM tbivm(thread); 2155 2156 bool threadIsSuspended; 2157 do { 2158 thread->set_suspend_equivalent(); 2159 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2160 while ((ret = ::sema_wait(&sig_sem)) == EINTR) 2161 ; 2162 assert(ret == 0, "sema_wait() failed"); 2163 2164 // were we externally suspended while we were waiting? 2165 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2166 if (threadIsSuspended) { 2167 // The semaphore has been incremented, but while we were waiting 2168 // another thread suspended us. We don't want to continue running 2169 // while suspended because that would surprise the thread that 2170 // suspended us. 2171 ret = ::sema_post(&sig_sem); 2172 assert(ret == 0, "sema_post() failed"); 2173 2174 thread->java_suspend_self(); 2175 } 2176 } while (threadIsSuspended); 2177 } 2178 } 2179 2180 int os::signal_lookup() { 2181 return check_pending_signals(false); 2182 } 2183 2184 int os::signal_wait() { 2185 return check_pending_signals(true); 2186 } 2187 2188 //////////////////////////////////////////////////////////////////////////////// 2189 // Virtual Memory 2190 2191 static int page_size = -1; 2192 2193 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will 2194 // clear this var if support is not available. 2195 static bool has_map_align = true; 2196 2197 int os::vm_page_size() { 2198 assert(page_size != -1, "must call os::init"); 2199 return page_size; 2200 } 2201 2202 // Solaris allocates memory by pages. 2203 int os::vm_allocation_granularity() { 2204 assert(page_size != -1, "must call os::init"); 2205 return page_size; 2206 } 2207 2208 static bool recoverable_mmap_error(int err) { 2209 // See if the error is one we can let the caller handle. This 2210 // list of errno values comes from the Solaris mmap(2) man page. 2211 switch (err) { 2212 case EBADF: 2213 case EINVAL: 2214 case ENOTSUP: 2215 // let the caller deal with these errors 2216 return true; 2217 2218 default: 2219 // Any remaining errors on this OS can cause our reserved mapping 2220 // to be lost. That can cause confusion where different data 2221 // structures think they have the same memory mapped. The worst 2222 // scenario is if both the VM and a library think they have the 2223 // same memory mapped. 2224 return false; 2225 } 2226 } 2227 2228 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec, 2229 int err) { 2230 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2231 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec, 2232 os::strerror(err), err); 2233 } 2234 2235 static void warn_fail_commit_memory(char* addr, size_t bytes, 2236 size_t alignment_hint, bool exec, 2237 int err) { 2238 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2239 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes, 2240 alignment_hint, exec, os::strerror(err), err); 2241 } 2242 2243 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) { 2244 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2245 size_t size = bytes; 2246 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2247 if (res != NULL) { 2248 if (UseNUMAInterleaving) { 2249 numa_make_global(addr, bytes); 2250 } 2251 return 0; 2252 } 2253 2254 int err = errno; // save errno from mmap() call in mmap_chunk() 2255 2256 if (!recoverable_mmap_error(err)) { 2257 warn_fail_commit_memory(addr, bytes, exec, err); 2258 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory."); 2259 } 2260 2261 return err; 2262 } 2263 2264 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 2265 return Solaris::commit_memory_impl(addr, bytes, exec) == 0; 2266 } 2267 2268 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec, 2269 const char* mesg) { 2270 assert(mesg != NULL, "mesg must be specified"); 2271 int err = os::Solaris::commit_memory_impl(addr, bytes, exec); 2272 if (err != 0) { 2273 // the caller wants all commit errors to exit with the specified mesg: 2274 warn_fail_commit_memory(addr, bytes, exec, err); 2275 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2276 } 2277 } 2278 2279 size_t os::Solaris::page_size_for_alignment(size_t alignment) { 2280 assert(is_aligned(alignment, (size_t) vm_page_size()), 2281 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, 2282 alignment, (size_t) vm_page_size()); 2283 2284 for (int i = 0; _page_sizes[i] != 0; i++) { 2285 if (is_aligned(alignment, _page_sizes[i])) { 2286 return _page_sizes[i]; 2287 } 2288 } 2289 2290 return (size_t) vm_page_size(); 2291 } 2292 2293 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, 2294 size_t alignment_hint, bool exec) { 2295 int err = Solaris::commit_memory_impl(addr, bytes, exec); 2296 if (err == 0 && UseLargePages && alignment_hint > 0) { 2297 assert(is_aligned(bytes, alignment_hint), 2298 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint); 2299 2300 // The syscall memcntl requires an exact page size (see man memcntl for details). 2301 size_t page_size = page_size_for_alignment(alignment_hint); 2302 if (page_size > (size_t) vm_page_size()) { 2303 (void)Solaris::setup_large_pages(addr, bytes, page_size); 2304 } 2305 } 2306 return err; 2307 } 2308 2309 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2310 bool exec) { 2311 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0; 2312 } 2313 2314 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, 2315 size_t alignment_hint, bool exec, 2316 const char* mesg) { 2317 assert(mesg != NULL, "mesg must be specified"); 2318 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec); 2319 if (err != 0) { 2320 // the caller wants all commit errors to exit with the specified mesg: 2321 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err); 2322 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2323 } 2324 } 2325 2326 // Uncommit the pages in a specified region. 2327 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { 2328 if (madvise(addr, bytes, MADV_FREE) < 0) { 2329 debug_only(warning("MADV_FREE failed.")); 2330 return; 2331 } 2332 } 2333 2334 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2335 return os::commit_memory(addr, size, !ExecMem); 2336 } 2337 2338 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2339 return os::uncommit_memory(addr, size); 2340 } 2341 2342 // Change the page size in a given range. 2343 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2344 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2345 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2346 if (UseLargePages) { 2347 size_t page_size = Solaris::page_size_for_alignment(alignment_hint); 2348 if (page_size > (size_t) vm_page_size()) { 2349 Solaris::setup_large_pages(addr, bytes, page_size); 2350 } 2351 } 2352 } 2353 2354 // Tell the OS to make the range local to the first-touching LWP 2355 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2356 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2357 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2358 debug_only(warning("MADV_ACCESS_LWP failed.")); 2359 } 2360 } 2361 2362 // Tell the OS that this range would be accessed from different LWPs. 2363 void os::numa_make_global(char *addr, size_t bytes) { 2364 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2365 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2366 debug_only(warning("MADV_ACCESS_MANY failed.")); 2367 } 2368 } 2369 2370 // Get the number of the locality groups. 2371 size_t os::numa_get_groups_num() { 2372 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2373 return n != -1 ? n : 1; 2374 } 2375 2376 // Get a list of leaf locality groups. A leaf lgroup is group that 2377 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2378 // board. An LWP is assigned to one of these groups upon creation. 2379 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2380 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2381 ids[0] = 0; 2382 return 1; 2383 } 2384 int result_size = 0, top = 1, bottom = 0, cur = 0; 2385 for (int k = 0; k < size; k++) { 2386 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2387 (Solaris::lgrp_id_t*)&ids[top], size - top); 2388 if (r == -1) { 2389 ids[0] = 0; 2390 return 1; 2391 } 2392 if (!r) { 2393 // That's a leaf node. 2394 assert(bottom <= cur, "Sanity check"); 2395 // Check if the node has memory 2396 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2397 NULL, 0, LGRP_RSRC_MEM) > 0) { 2398 ids[bottom++] = ids[cur]; 2399 } 2400 } 2401 top += r; 2402 cur++; 2403 } 2404 if (bottom == 0) { 2405 // Handle a situation, when the OS reports no memory available. 2406 // Assume UMA architecture. 2407 ids[0] = 0; 2408 return 1; 2409 } 2410 return bottom; 2411 } 2412 2413 // Detect the topology change. Typically happens during CPU plugging-unplugging. 2414 bool os::numa_topology_changed() { 2415 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2416 if (is_stale != -1 && is_stale) { 2417 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2418 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2419 assert(c != 0, "Failure to initialize LGRP API"); 2420 Solaris::set_lgrp_cookie(c); 2421 return true; 2422 } 2423 return false; 2424 } 2425 2426 // Get the group id of the current LWP. 2427 int os::numa_get_group_id() { 2428 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2429 if (lgrp_id == -1) { 2430 return 0; 2431 } 2432 const int size = os::numa_get_groups_num(); 2433 int *ids = (int*)alloca(size * sizeof(int)); 2434 2435 // Get the ids of all lgroups with memory; r is the count. 2436 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2437 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2438 if (r <= 0) { 2439 return 0; 2440 } 2441 return ids[os::random() % r]; 2442 } 2443 2444 // Request information about the page. 2445 bool os::get_page_info(char *start, page_info* info) { 2446 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2447 uint64_t addr = (uintptr_t)start; 2448 uint64_t outdata[2]; 2449 uint_t validity = 0; 2450 2451 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2452 return false; 2453 } 2454 2455 info->size = 0; 2456 info->lgrp_id = -1; 2457 2458 if ((validity & 1) != 0) { 2459 if ((validity & 2) != 0) { 2460 info->lgrp_id = outdata[0]; 2461 } 2462 if ((validity & 4) != 0) { 2463 info->size = outdata[1]; 2464 } 2465 return true; 2466 } 2467 return false; 2468 } 2469 2470 // Scan the pages from start to end until a page different than 2471 // the one described in the info parameter is encountered. 2472 char *os::scan_pages(char *start, char* end, page_info* page_expected, 2473 page_info* page_found) { 2474 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2475 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2476 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1]; 2477 uint_t validity[MAX_MEMINFO_CNT]; 2478 2479 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2480 uint64_t p = (uint64_t)start; 2481 while (p < (uint64_t)end) { 2482 addrs[0] = p; 2483 size_t addrs_count = 1; 2484 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { 2485 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2486 addrs_count++; 2487 } 2488 2489 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2490 return NULL; 2491 } 2492 2493 size_t i = 0; 2494 for (; i < addrs_count; i++) { 2495 if ((validity[i] & 1) != 0) { 2496 if ((validity[i] & 4) != 0) { 2497 if (outdata[types * i + 1] != page_expected->size) { 2498 break; 2499 } 2500 } else if (page_expected->size != 0) { 2501 break; 2502 } 2503 2504 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2505 if (outdata[types * i] != page_expected->lgrp_id) { 2506 break; 2507 } 2508 } 2509 } else { 2510 return NULL; 2511 } 2512 } 2513 2514 if (i < addrs_count) { 2515 if ((validity[i] & 2) != 0) { 2516 page_found->lgrp_id = outdata[types * i]; 2517 } else { 2518 page_found->lgrp_id = -1; 2519 } 2520 if ((validity[i] & 4) != 0) { 2521 page_found->size = outdata[types * i + 1]; 2522 } else { 2523 page_found->size = 0; 2524 } 2525 return (char*)addrs[i]; 2526 } 2527 2528 p = addrs[addrs_count - 1] + page_size; 2529 } 2530 return end; 2531 } 2532 2533 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 2534 size_t size = bytes; 2535 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2536 // uncommitted page. Otherwise, the read/write might succeed if we 2537 // have enough swap space to back the physical page. 2538 return 2539 NULL != Solaris::mmap_chunk(addr, size, 2540 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2541 PROT_NONE); 2542 } 2543 2544 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2545 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2546 2547 if (b == MAP_FAILED) { 2548 return NULL; 2549 } 2550 return b; 2551 } 2552 2553 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, 2554 size_t alignment_hint, bool fixed) { 2555 char* addr = requested_addr; 2556 int flags = MAP_PRIVATE | MAP_NORESERVE; 2557 2558 assert(!(fixed && (alignment_hint > 0)), 2559 "alignment hint meaningless with fixed mmap"); 2560 2561 if (fixed) { 2562 flags |= MAP_FIXED; 2563 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) { 2564 flags |= MAP_ALIGN; 2565 addr = (char*) alignment_hint; 2566 } 2567 2568 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2569 // uncommitted page. Otherwise, the read/write might succeed if we 2570 // have enough swap space to back the physical page. 2571 return mmap_chunk(addr, bytes, flags, PROT_NONE); 2572 } 2573 2574 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2575 size_t alignment_hint) { 2576 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, 2577 (requested_addr != NULL)); 2578 2579 guarantee(requested_addr == NULL || requested_addr == addr, 2580 "OS failed to return requested mmap address."); 2581 return addr; 2582 } 2583 2584 // Reserve memory at an arbitrary address, only if that area is 2585 // available (and not reserved for something else). 2586 2587 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2588 const int max_tries = 10; 2589 char* base[max_tries]; 2590 size_t size[max_tries]; 2591 2592 // Solaris adds a gap between mmap'ed regions. The size of the gap 2593 // is dependent on the requested size and the MMU. Our initial gap 2594 // value here is just a guess and will be corrected later. 2595 bool had_top_overlap = false; 2596 bool have_adjusted_gap = false; 2597 size_t gap = 0x400000; 2598 2599 // Assert only that the size is a multiple of the page size, since 2600 // that's all that mmap requires, and since that's all we really know 2601 // about at this low abstraction level. If we need higher alignment, 2602 // we can either pass an alignment to this method or verify alignment 2603 // in one of the methods further up the call chain. See bug 5044738. 2604 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2605 2606 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 2607 // Give it a try, if the kernel honors the hint we can return immediately. 2608 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 2609 2610 volatile int err = errno; 2611 if (addr == requested_addr) { 2612 return addr; 2613 } else if (addr != NULL) { 2614 pd_unmap_memory(addr, bytes); 2615 } 2616 2617 if (log_is_enabled(Warning, os)) { 2618 char buf[256]; 2619 buf[0] = '\0'; 2620 if (addr == NULL) { 2621 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err)); 2622 } 2623 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at " 2624 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT 2625 "%s", bytes, requested_addr, addr, buf); 2626 } 2627 2628 // Address hint method didn't work. Fall back to the old method. 2629 // In theory, once SNV becomes our oldest supported platform, this 2630 // code will no longer be needed. 2631 // 2632 // Repeatedly allocate blocks until the block is allocated at the 2633 // right spot. Give up after max_tries. 2634 int i; 2635 for (i = 0; i < max_tries; ++i) { 2636 base[i] = reserve_memory(bytes); 2637 2638 if (base[i] != NULL) { 2639 // Is this the block we wanted? 2640 if (base[i] == requested_addr) { 2641 size[i] = bytes; 2642 break; 2643 } 2644 2645 // check that the gap value is right 2646 if (had_top_overlap && !have_adjusted_gap) { 2647 size_t actual_gap = base[i-1] - base[i] - bytes; 2648 if (gap != actual_gap) { 2649 // adjust the gap value and retry the last 2 allocations 2650 assert(i > 0, "gap adjustment code problem"); 2651 have_adjusted_gap = true; // adjust the gap only once, just in case 2652 gap = actual_gap; 2653 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap); 2654 unmap_memory(base[i], bytes); 2655 unmap_memory(base[i-1], size[i-1]); 2656 i-=2; 2657 continue; 2658 } 2659 } 2660 2661 // Does this overlap the block we wanted? Give back the overlapped 2662 // parts and try again. 2663 // 2664 // There is still a bug in this code: if top_overlap == bytes, 2665 // the overlap is offset from requested region by the value of gap. 2666 // In this case giving back the overlapped part will not work, 2667 // because we'll give back the entire block at base[i] and 2668 // therefore the subsequent allocation will not generate a new gap. 2669 // This could be fixed with a new algorithm that used larger 2670 // or variable size chunks to find the requested region - 2671 // but such a change would introduce additional complications. 2672 // It's rare enough that the planets align for this bug, 2673 // so we'll just wait for a fix for 6204603/5003415 which 2674 // will provide a mmap flag to allow us to avoid this business. 2675 2676 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2677 if (top_overlap >= 0 && top_overlap < bytes) { 2678 had_top_overlap = true; 2679 unmap_memory(base[i], top_overlap); 2680 base[i] += top_overlap; 2681 size[i] = bytes - top_overlap; 2682 } else { 2683 size_t bottom_overlap = base[i] + bytes - requested_addr; 2684 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2685 if (bottom_overlap == 0) { 2686 log_info(os)("attempt_reserve_memory_at: possible alignment bug"); 2687 } 2688 unmap_memory(requested_addr, bottom_overlap); 2689 size[i] = bytes - bottom_overlap; 2690 } else { 2691 size[i] = bytes; 2692 } 2693 } 2694 } 2695 } 2696 2697 // Give back the unused reserved pieces. 2698 2699 for (int j = 0; j < i; ++j) { 2700 if (base[j] != NULL) { 2701 unmap_memory(base[j], size[j]); 2702 } 2703 } 2704 2705 return (i < max_tries) ? requested_addr : NULL; 2706 } 2707 2708 bool os::pd_release_memory(char* addr, size_t bytes) { 2709 size_t size = bytes; 2710 return munmap(addr, size) == 0; 2711 } 2712 2713 static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 2714 assert(addr == (char*)align_down((uintptr_t)addr, os::vm_page_size()), 2715 "addr must be page aligned"); 2716 int retVal = mprotect(addr, bytes, prot); 2717 return retVal == 0; 2718 } 2719 2720 // Protect memory (Used to pass readonly pages through 2721 // JNI GetArray<type>Elements with empty arrays.) 2722 // Also, used for serialization page and for compressed oops null pointer 2723 // checking. 2724 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2725 bool is_committed) { 2726 unsigned int p = 0; 2727 switch (prot) { 2728 case MEM_PROT_NONE: p = PROT_NONE; break; 2729 case MEM_PROT_READ: p = PROT_READ; break; 2730 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2731 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2732 default: 2733 ShouldNotReachHere(); 2734 } 2735 // is_committed is unused. 2736 return solaris_mprotect(addr, bytes, p); 2737 } 2738 2739 // guard_memory and unguard_memory only happens within stack guard pages. 2740 // Since ISM pertains only to the heap, guard and unguard memory should not 2741 /// happen with an ISM region. 2742 bool os::guard_memory(char* addr, size_t bytes) { 2743 return solaris_mprotect(addr, bytes, PROT_NONE); 2744 } 2745 2746 bool os::unguard_memory(char* addr, size_t bytes) { 2747 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 2748 } 2749 2750 // Large page support 2751 static size_t _large_page_size = 0; 2752 2753 // Insertion sort for small arrays (descending order). 2754 static void insertion_sort_descending(size_t* array, int len) { 2755 for (int i = 0; i < len; i++) { 2756 size_t val = array[i]; 2757 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 2758 size_t tmp = array[key]; 2759 array[key] = array[key - 1]; 2760 array[key - 1] = tmp; 2761 } 2762 } 2763 } 2764 2765 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) { 2766 const unsigned int usable_count = VM_Version::page_size_count(); 2767 if (usable_count == 1) { 2768 return false; 2769 } 2770 2771 // Find the right getpagesizes interface. When solaris 11 is the minimum 2772 // build platform, getpagesizes() (without the '2') can be called directly. 2773 typedef int (*gps_t)(size_t[], int); 2774 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); 2775 if (gps_func == NULL) { 2776 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); 2777 if (gps_func == NULL) { 2778 if (warn) { 2779 warning("MPSS is not supported by the operating system."); 2780 } 2781 return false; 2782 } 2783 } 2784 2785 // Fill the array of page sizes. 2786 int n = (*gps_func)(_page_sizes, page_sizes_max); 2787 assert(n > 0, "Solaris bug?"); 2788 2789 if (n == page_sizes_max) { 2790 // Add a sentinel value (necessary only if the array was completely filled 2791 // since it is static (zeroed at initialization)). 2792 _page_sizes[--n] = 0; 2793 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 2794 } 2795 assert(_page_sizes[n] == 0, "missing sentinel"); 2796 trace_page_sizes("available page sizes", _page_sizes, n); 2797 2798 if (n == 1) return false; // Only one page size available. 2799 2800 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 2801 // select up to usable_count elements. First sort the array, find the first 2802 // acceptable value, then copy the usable sizes to the top of the array and 2803 // trim the rest. Make sure to include the default page size :-). 2804 // 2805 // A better policy could get rid of the 4M limit by taking the sizes of the 2806 // important VM memory regions (java heap and possibly the code cache) into 2807 // account. 2808 insertion_sort_descending(_page_sizes, n); 2809 const size_t size_limit = 2810 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 2811 int beg; 2812 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */; 2813 const int end = MIN2((int)usable_count, n) - 1; 2814 for (int cur = 0; cur < end; ++cur, ++beg) { 2815 _page_sizes[cur] = _page_sizes[beg]; 2816 } 2817 _page_sizes[end] = vm_page_size(); 2818 _page_sizes[end + 1] = 0; 2819 2820 if (_page_sizes[end] > _page_sizes[end - 1]) { 2821 // Default page size is not the smallest; sort again. 2822 insertion_sort_descending(_page_sizes, end + 1); 2823 } 2824 *page_size = _page_sizes[0]; 2825 2826 trace_page_sizes("usable page sizes", _page_sizes, end + 1); 2827 return true; 2828 } 2829 2830 void os::large_page_init() { 2831 if (UseLargePages) { 2832 // print a warning if any large page related flag is specified on command line 2833 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2834 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2835 2836 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 2837 } 2838 } 2839 2840 bool os::Solaris::is_valid_page_size(size_t bytes) { 2841 for (int i = 0; _page_sizes[i] != 0; i++) { 2842 if (_page_sizes[i] == bytes) { 2843 return true; 2844 } 2845 } 2846 return false; 2847 } 2848 2849 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) { 2850 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align); 2851 assert(is_aligned((void*) start, align), 2852 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align); 2853 assert(is_aligned(bytes, align), 2854 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align); 2855 2856 // Signal to OS that we want large pages for addresses 2857 // from addr, addr + bytes 2858 struct memcntl_mha mpss_struct; 2859 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 2860 mpss_struct.mha_pagesize = align; 2861 mpss_struct.mha_flags = 0; 2862 // Upon successful completion, memcntl() returns 0 2863 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) { 2864 debug_only(warning("Attempt to use MPSS failed.")); 2865 return false; 2866 } 2867 return true; 2868 } 2869 2870 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) { 2871 fatal("os::reserve_memory_special should not be called on Solaris."); 2872 return NULL; 2873 } 2874 2875 bool os::release_memory_special(char* base, size_t bytes) { 2876 fatal("os::release_memory_special should not be called on Solaris."); 2877 return false; 2878 } 2879 2880 size_t os::large_page_size() { 2881 return _large_page_size; 2882 } 2883 2884 // MPSS allows application to commit large page memory on demand; with ISM 2885 // the entire memory region must be allocated as shared memory. 2886 bool os::can_commit_large_page_memory() { 2887 return true; 2888 } 2889 2890 bool os::can_execute_large_page_memory() { 2891 return true; 2892 } 2893 2894 // Read calls from inside the vm need to perform state transitions 2895 size_t os::read(int fd, void *buf, unsigned int nBytes) { 2896 size_t res; 2897 JavaThread* thread = (JavaThread*)Thread::current(); 2898 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 2899 ThreadBlockInVM tbiv(thread); 2900 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 2901 return res; 2902 } 2903 2904 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 2905 size_t res; 2906 JavaThread* thread = (JavaThread*)Thread::current(); 2907 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 2908 ThreadBlockInVM tbiv(thread); 2909 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res); 2910 return res; 2911 } 2912 2913 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) { 2914 size_t res; 2915 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 2916 "Assumed _thread_in_native"); 2917 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 2918 return res; 2919 } 2920 2921 void os::naked_short_sleep(jlong ms) { 2922 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 2923 2924 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but 2925 // Solaris requires -lrt for this. 2926 usleep((ms * 1000)); 2927 2928 return; 2929 } 2930 2931 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2932 void os::infinite_sleep() { 2933 while (true) { // sleep forever ... 2934 ::sleep(100); // ... 100 seconds at a time 2935 } 2936 } 2937 2938 // Used to convert frequent JVM_Yield() to nops 2939 bool os::dont_yield() { 2940 if (DontYieldALot) { 2941 static hrtime_t last_time = 0; 2942 hrtime_t diff = getTimeNanos() - last_time; 2943 2944 if (diff < DontYieldALotInterval * 1000000) { 2945 return true; 2946 } 2947 2948 last_time += diff; 2949 2950 return false; 2951 } else { 2952 return false; 2953 } 2954 } 2955 2956 // Note that yield semantics are defined by the scheduling class to which 2957 // the thread currently belongs. Typically, yield will _not yield to 2958 // other equal or higher priority threads that reside on the dispatch queues 2959 // of other CPUs. 2960 2961 void os::naked_yield() { 2962 thr_yield(); 2963 } 2964 2965 // Interface for setting lwp priorities. We are using T2 libthread, 2966 // which forces the use of bound threads, so all of our threads will 2967 // be assigned to real lwp's. Using the thr_setprio function is 2968 // meaningless in this mode so we must adjust the real lwp's priority. 2969 // The routines below implement the getting and setting of lwp priorities. 2970 // 2971 // Note: There are three priority scales used on Solaris. Java priotities 2972 // which range from 1 to 10, libthread "thr_setprio" scale which range 2973 // from 0 to 127, and the current scheduling class of the process we 2974 // are running in. This is typically from -60 to +60. 2975 // The setting of the lwp priorities in done after a call to thr_setprio 2976 // so Java priorities are mapped to libthread priorities and we map from 2977 // the latter to lwp priorities. We don't keep priorities stored in 2978 // Java priorities since some of our worker threads want to set priorities 2979 // higher than all Java threads. 2980 // 2981 // For related information: 2982 // (1) man -s 2 priocntl 2983 // (2) man -s 4 priocntl 2984 // (3) man dispadmin 2985 // = librt.so 2986 // = libthread/common/rtsched.c - thrp_setlwpprio(). 2987 // = ps -cL <pid> ... to validate priority. 2988 // = sched_get_priority_min and _max 2989 // pthread_create 2990 // sched_setparam 2991 // pthread_setschedparam 2992 // 2993 // Assumptions: 2994 // + We assume that all threads in the process belong to the same 2995 // scheduling class. IE. an homogenous process. 2996 // + Must be root or in IA group to change change "interactive" attribute. 2997 // Priocntl() will fail silently. The only indication of failure is when 2998 // we read-back the value and notice that it hasn't changed. 2999 // + Interactive threads enter the runq at the head, non-interactive at the tail. 3000 // + For RT, change timeslice as well. Invariant: 3001 // constant "priority integral" 3002 // Konst == TimeSlice * (60-Priority) 3003 // Given a priority, compute appropriate timeslice. 3004 // + Higher numerical values have higher priority. 3005 3006 // sched class attributes 3007 typedef struct { 3008 int schedPolicy; // classID 3009 int maxPrio; 3010 int minPrio; 3011 } SchedInfo; 3012 3013 3014 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; 3015 3016 #ifdef ASSERT 3017 static int ReadBackValidate = 1; 3018 #endif 3019 static int myClass = 0; 3020 static int myMin = 0; 3021 static int myMax = 0; 3022 static int myCur = 0; 3023 static bool priocntl_enable = false; 3024 3025 static const int criticalPrio = FXCriticalPriority; 3026 static int java_MaxPriority_to_os_priority = 0; // Saved mapping 3027 3028 3029 // lwp_priocntl_init 3030 // 3031 // Try to determine the priority scale for our process. 3032 // 3033 // Return errno or 0 if OK. 3034 // 3035 static int lwp_priocntl_init() { 3036 int rslt; 3037 pcinfo_t ClassInfo; 3038 pcparms_t ParmInfo; 3039 int i; 3040 3041 if (!UseThreadPriorities) return 0; 3042 3043 // If ThreadPriorityPolicy is 1, switch tables 3044 if (ThreadPriorityPolicy == 1) { 3045 for (i = 0; i < CriticalPriority+1; i++) 3046 os::java_to_os_priority[i] = prio_policy1[i]; 3047 } 3048 if (UseCriticalJavaThreadPriority) { 3049 // MaxPriority always maps to the FX scheduling class and criticalPrio. 3050 // See set_native_priority() and set_lwp_class_and_priority(). 3051 // Save original MaxPriority mapping in case attempt to 3052 // use critical priority fails. 3053 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; 3054 // Set negative to distinguish from other priorities 3055 os::java_to_os_priority[MaxPriority] = -criticalPrio; 3056 } 3057 3058 // Get IDs for a set of well-known scheduling classes. 3059 // TODO-FIXME: GETCLINFO returns the current # of classes in the 3060 // the system. We should have a loop that iterates over the 3061 // classID values, which are known to be "small" integers. 3062 3063 strcpy(ClassInfo.pc_clname, "TS"); 3064 ClassInfo.pc_cid = -1; 3065 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3066 if (rslt < 0) return errno; 3067 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 3068 tsLimits.schedPolicy = ClassInfo.pc_cid; 3069 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 3070 tsLimits.minPrio = -tsLimits.maxPrio; 3071 3072 strcpy(ClassInfo.pc_clname, "IA"); 3073 ClassInfo.pc_cid = -1; 3074 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3075 if (rslt < 0) return errno; 3076 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 3077 iaLimits.schedPolicy = ClassInfo.pc_cid; 3078 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 3079 iaLimits.minPrio = -iaLimits.maxPrio; 3080 3081 strcpy(ClassInfo.pc_clname, "RT"); 3082 ClassInfo.pc_cid = -1; 3083 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3084 if (rslt < 0) return errno; 3085 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 3086 rtLimits.schedPolicy = ClassInfo.pc_cid; 3087 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 3088 rtLimits.minPrio = 0; 3089 3090 strcpy(ClassInfo.pc_clname, "FX"); 3091 ClassInfo.pc_cid = -1; 3092 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3093 if (rslt < 0) return errno; 3094 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); 3095 fxLimits.schedPolicy = ClassInfo.pc_cid; 3096 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; 3097 fxLimits.minPrio = 0; 3098 3099 // Query our "current" scheduling class. 3100 // This will normally be IA, TS or, rarely, FX or RT. 3101 memset(&ParmInfo, 0, sizeof(ParmInfo)); 3102 ParmInfo.pc_cid = PC_CLNULL; 3103 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3104 if (rslt < 0) return errno; 3105 myClass = ParmInfo.pc_cid; 3106 3107 // We now know our scheduling classId, get specific information 3108 // about the class. 3109 ClassInfo.pc_cid = myClass; 3110 ClassInfo.pc_clname[0] = 0; 3111 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); 3112 if (rslt < 0) return errno; 3113 3114 if (ThreadPriorityVerbose) { 3115 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 3116 } 3117 3118 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3119 ParmInfo.pc_cid = PC_CLNULL; 3120 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3121 if (rslt < 0) return errno; 3122 3123 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3124 myMin = rtLimits.minPrio; 3125 myMax = rtLimits.maxPrio; 3126 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3127 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3128 myMin = iaLimits.minPrio; 3129 myMax = iaLimits.maxPrio; 3130 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 3131 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3132 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3133 myMin = tsLimits.minPrio; 3134 myMax = tsLimits.maxPrio; 3135 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 3136 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3137 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3138 myMin = fxLimits.minPrio; 3139 myMax = fxLimits.maxPrio; 3140 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict 3141 } else { 3142 // No clue - punt 3143 if (ThreadPriorityVerbose) { 3144 tty->print_cr("Unknown scheduling class: %s ... \n", 3145 ClassInfo.pc_clname); 3146 } 3147 return EINVAL; // no clue, punt 3148 } 3149 3150 if (ThreadPriorityVerbose) { 3151 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax); 3152 } 3153 3154 priocntl_enable = true; // Enable changing priorities 3155 return 0; 3156 } 3157 3158 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 3159 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 3160 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 3161 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) 3162 3163 3164 // scale_to_lwp_priority 3165 // 3166 // Convert from the libthread "thr_setprio" scale to our current 3167 // lwp scheduling class scale. 3168 // 3169 static int scale_to_lwp_priority(int rMin, int rMax, int x) { 3170 int v; 3171 3172 if (x == 127) return rMax; // avoid round-down 3173 v = (((x*(rMax-rMin)))/128)+rMin; 3174 return v; 3175 } 3176 3177 3178 // set_lwp_class_and_priority 3179 int set_lwp_class_and_priority(int ThreadID, int lwpid, 3180 int newPrio, int new_class, bool scale) { 3181 int rslt; 3182 int Actual, Expected, prv; 3183 pcparms_t ParmInfo; // for GET-SET 3184 #ifdef ASSERT 3185 pcparms_t ReadBack; // for readback 3186 #endif 3187 3188 // Set priority via PC_GETPARMS, update, PC_SETPARMS 3189 // Query current values. 3190 // TODO: accelerate this by eliminating the PC_GETPARMS call. 3191 // Cache "pcparms_t" in global ParmCache. 3192 // TODO: elide set-to-same-value 3193 3194 // If something went wrong on init, don't change priorities. 3195 if (!priocntl_enable) { 3196 if (ThreadPriorityVerbose) { 3197 tty->print_cr("Trying to set priority but init failed, ignoring"); 3198 } 3199 return EINVAL; 3200 } 3201 3202 // If lwp hasn't started yet, just return 3203 // the _start routine will call us again. 3204 if (lwpid <= 0) { 3205 if (ThreadPriorityVerbose) { 3206 tty->print_cr("deferring the set_lwp_class_and_priority of thread " 3207 INTPTR_FORMAT " to %d, lwpid not set", 3208 ThreadID, newPrio); 3209 } 3210 return 0; 3211 } 3212 3213 if (ThreadPriorityVerbose) { 3214 tty->print_cr ("set_lwp_class_and_priority(" 3215 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 3216 ThreadID, lwpid, newPrio); 3217 } 3218 3219 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3220 ParmInfo.pc_cid = PC_CLNULL; 3221 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 3222 if (rslt < 0) return errno; 3223 3224 int cur_class = ParmInfo.pc_cid; 3225 ParmInfo.pc_cid = (id_t)new_class; 3226 3227 if (new_class == rtLimits.schedPolicy) { 3228 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 3229 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, 3230 rtLimits.maxPrio, newPrio) 3231 : newPrio; 3232 rtInfo->rt_tqsecs = RT_NOCHANGE; 3233 rtInfo->rt_tqnsecs = RT_NOCHANGE; 3234 if (ThreadPriorityVerbose) { 3235 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 3236 } 3237 } else if (new_class == iaLimits.schedPolicy) { 3238 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3239 int maxClamped = MIN2(iaLimits.maxPrio, 3240 cur_class == new_class 3241 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); 3242 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, 3243 maxClamped, newPrio) 3244 : newPrio; 3245 iaInfo->ia_uprilim = cur_class == new_class 3246 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; 3247 iaInfo->ia_mode = IA_NOCHANGE; 3248 if (ThreadPriorityVerbose) { 3249 tty->print_cr("IA: [%d...%d] %d->%d\n", 3250 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 3251 } 3252 } else if (new_class == tsLimits.schedPolicy) { 3253 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3254 int maxClamped = MIN2(tsLimits.maxPrio, 3255 cur_class == new_class 3256 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); 3257 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, 3258 maxClamped, newPrio) 3259 : newPrio; 3260 tsInfo->ts_uprilim = cur_class == new_class 3261 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; 3262 if (ThreadPriorityVerbose) { 3263 tty->print_cr("TS: [%d...%d] %d->%d\n", 3264 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 3265 } 3266 } else if (new_class == fxLimits.schedPolicy) { 3267 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3268 int maxClamped = MIN2(fxLimits.maxPrio, 3269 cur_class == new_class 3270 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); 3271 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, 3272 maxClamped, newPrio) 3273 : newPrio; 3274 fxInfo->fx_uprilim = cur_class == new_class 3275 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; 3276 fxInfo->fx_tqsecs = FX_NOCHANGE; 3277 fxInfo->fx_tqnsecs = FX_NOCHANGE; 3278 if (ThreadPriorityVerbose) { 3279 tty->print_cr("FX: [%d...%d] %d->%d\n", 3280 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); 3281 } 3282 } else { 3283 if (ThreadPriorityVerbose) { 3284 tty->print_cr("Unknown new scheduling class %d\n", new_class); 3285 } 3286 return EINVAL; // no clue, punt 3287 } 3288 3289 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 3290 if (ThreadPriorityVerbose && rslt) { 3291 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 3292 } 3293 if (rslt < 0) return errno; 3294 3295 #ifdef ASSERT 3296 // Sanity check: read back what we just attempted to set. 3297 // In theory it could have changed in the interim ... 3298 // 3299 // The priocntl system call is tricky. 3300 // Sometimes it'll validate the priority value argument and 3301 // return EINVAL if unhappy. At other times it fails silently. 3302 // Readbacks are prudent. 3303 3304 if (!ReadBackValidate) return 0; 3305 3306 memset(&ReadBack, 0, sizeof(pcparms_t)); 3307 ReadBack.pc_cid = PC_CLNULL; 3308 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 3309 assert(rslt >= 0, "priocntl failed"); 3310 Actual = Expected = 0xBAD; 3311 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3312 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3313 Actual = RTPRI(ReadBack)->rt_pri; 3314 Expected = RTPRI(ParmInfo)->rt_pri; 3315 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3316 Actual = IAPRI(ReadBack)->ia_upri; 3317 Expected = IAPRI(ParmInfo)->ia_upri; 3318 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3319 Actual = TSPRI(ReadBack)->ts_upri; 3320 Expected = TSPRI(ParmInfo)->ts_upri; 3321 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3322 Actual = FXPRI(ReadBack)->fx_upri; 3323 Expected = FXPRI(ParmInfo)->fx_upri; 3324 } else { 3325 if (ThreadPriorityVerbose) { 3326 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", 3327 ParmInfo.pc_cid); 3328 } 3329 } 3330 3331 if (Actual != Expected) { 3332 if (ThreadPriorityVerbose) { 3333 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 3334 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 3335 } 3336 } 3337 #endif 3338 3339 return 0; 3340 } 3341 3342 // Solaris only gives access to 128 real priorities at a time, 3343 // so we expand Java's ten to fill this range. This would be better 3344 // if we dynamically adjusted relative priorities. 3345 // 3346 // The ThreadPriorityPolicy option allows us to select 2 different 3347 // priority scales. 3348 // 3349 // ThreadPriorityPolicy=0 3350 // Since the Solaris' default priority is MaximumPriority, we do not 3351 // set a priority lower than Max unless a priority lower than 3352 // NormPriority is requested. 3353 // 3354 // ThreadPriorityPolicy=1 3355 // This mode causes the priority table to get filled with 3356 // linear values. NormPriority get's mapped to 50% of the 3357 // Maximum priority an so on. This will cause VM threads 3358 // to get unfair treatment against other Solaris processes 3359 // which do not explicitly alter their thread priorities. 3360 3361 int os::java_to_os_priority[CriticalPriority + 1] = { 3362 -99999, // 0 Entry should never be used 3363 3364 0, // 1 MinPriority 3365 32, // 2 3366 64, // 3 3367 3368 96, // 4 3369 127, // 5 NormPriority 3370 127, // 6 3371 3372 127, // 7 3373 127, // 8 3374 127, // 9 NearMaxPriority 3375 3376 127, // 10 MaxPriority 3377 3378 -criticalPrio // 11 CriticalPriority 3379 }; 3380 3381 OSReturn os::set_native_priority(Thread* thread, int newpri) { 3382 OSThread* osthread = thread->osthread(); 3383 3384 // Save requested priority in case the thread hasn't been started 3385 osthread->set_native_priority(newpri); 3386 3387 // Check for critical priority request 3388 bool fxcritical = false; 3389 if (newpri == -criticalPrio) { 3390 fxcritical = true; 3391 newpri = criticalPrio; 3392 } 3393 3394 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 3395 if (!UseThreadPriorities) return OS_OK; 3396 3397 int status = 0; 3398 3399 if (!fxcritical) { 3400 // Use thr_setprio only if we have a priority that thr_setprio understands 3401 status = thr_setprio(thread->osthread()->thread_id(), newpri); 3402 } 3403 3404 int lwp_status = 3405 set_lwp_class_and_priority(osthread->thread_id(), 3406 osthread->lwp_id(), 3407 newpri, 3408 fxcritical ? fxLimits.schedPolicy : myClass, 3409 !fxcritical); 3410 if (lwp_status != 0 && fxcritical) { 3411 // Try again, this time without changing the scheduling class 3412 newpri = java_MaxPriority_to_os_priority; 3413 lwp_status = set_lwp_class_and_priority(osthread->thread_id(), 3414 osthread->lwp_id(), 3415 newpri, myClass, false); 3416 } 3417 status |= lwp_status; 3418 return (status == 0) ? OS_OK : OS_ERR; 3419 } 3420 3421 3422 OSReturn os::get_native_priority(const Thread* const thread, 3423 int *priority_ptr) { 3424 int p; 3425 if (!UseThreadPriorities) { 3426 *priority_ptr = NormalPriority; 3427 return OS_OK; 3428 } 3429 int status = thr_getprio(thread->osthread()->thread_id(), &p); 3430 if (status != 0) { 3431 return OS_ERR; 3432 } 3433 *priority_ptr = p; 3434 return OS_OK; 3435 } 3436 3437 3438 // Hint to the underlying OS that a task switch would not be good. 3439 // Void return because it's a hint and can fail. 3440 void os::hint_no_preempt() { 3441 schedctl_start(schedctl_init()); 3442 } 3443 3444 //////////////////////////////////////////////////////////////////////////////// 3445 // suspend/resume support 3446 3447 // The low-level signal-based suspend/resume support is a remnant from the 3448 // old VM-suspension that used to be for java-suspension, safepoints etc, 3449 // within hotspot. Currently used by JFR's OSThreadSampler 3450 // 3451 // The remaining code is greatly simplified from the more general suspension 3452 // code that used to be used. 3453 // 3454 // The protocol is quite simple: 3455 // - suspend: 3456 // - sends a signal to the target thread 3457 // - polls the suspend state of the osthread using a yield loop 3458 // - target thread signal handler (SR_handler) sets suspend state 3459 // and blocks in sigsuspend until continued 3460 // - resume: 3461 // - sets target osthread state to continue 3462 // - sends signal to end the sigsuspend loop in the SR_handler 3463 // 3464 // Note that the SR_lock plays no role in this suspend/resume protocol, 3465 // but is checked for NULL in SR_handler as a thread termination indicator. 3466 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. 3467 // 3468 // Note that resume_clear_context() and suspend_save_context() are needed 3469 // by SR_handler(), so that fetch_frame_from_ucontext() works, 3470 // which in part is used by: 3471 // - Forte Analyzer: AsyncGetCallTrace() 3472 // - StackBanging: get_frame_at_stack_banging_point() 3473 // - JFR: get_topframe()-->....-->get_valid_uc_in_signal_handler() 3474 3475 static void resume_clear_context(OSThread *osthread) { 3476 osthread->set_ucontext(NULL); 3477 } 3478 3479 static void suspend_save_context(OSThread *osthread, ucontext_t* context) { 3480 osthread->set_ucontext(context); 3481 } 3482 3483 static PosixSemaphore sr_semaphore; 3484 3485 void os::Solaris::SR_handler(Thread* thread, ucontext_t* context) { 3486 // Save and restore errno to avoid confusing native code with EINTR 3487 // after sigsuspend. 3488 int old_errno = errno; 3489 3490 OSThread* osthread = thread->osthread(); 3491 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 3492 3493 os::SuspendResume::State current = osthread->sr.state(); 3494 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 3495 suspend_save_context(osthread, context); 3496 3497 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 3498 os::SuspendResume::State state = osthread->sr.suspended(); 3499 if (state == os::SuspendResume::SR_SUSPENDED) { 3500 sigset_t suspend_set; // signals for sigsuspend() 3501 3502 // get current set of blocked signals and unblock resume signal 3503 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 3504 sigdelset(&suspend_set, ASYNC_SIGNAL); 3505 3506 sr_semaphore.signal(); 3507 // wait here until we are resumed 3508 while (1) { 3509 sigsuspend(&suspend_set); 3510 3511 os::SuspendResume::State result = osthread->sr.running(); 3512 if (result == os::SuspendResume::SR_RUNNING) { 3513 sr_semaphore.signal(); 3514 break; 3515 } 3516 } 3517 3518 } else if (state == os::SuspendResume::SR_RUNNING) { 3519 // request was cancelled, continue 3520 } else { 3521 ShouldNotReachHere(); 3522 } 3523 3524 resume_clear_context(osthread); 3525 } else if (current == os::SuspendResume::SR_RUNNING) { 3526 // request was cancelled, continue 3527 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 3528 // ignore 3529 } else { 3530 // ignore 3531 } 3532 3533 errno = old_errno; 3534 } 3535 3536 void os::print_statistics() { 3537 } 3538 3539 bool os::message_box(const char* title, const char* message) { 3540 int i; 3541 fdStream err(defaultStream::error_fd()); 3542 for (i = 0; i < 78; i++) err.print_raw("="); 3543 err.cr(); 3544 err.print_raw_cr(title); 3545 for (i = 0; i < 78; i++) err.print_raw("-"); 3546 err.cr(); 3547 err.print_raw_cr(message); 3548 for (i = 0; i < 78; i++) err.print_raw("="); 3549 err.cr(); 3550 3551 char buf[16]; 3552 // Prevent process from exiting upon "read error" without consuming all CPU 3553 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3554 3555 return buf[0] == 'y' || buf[0] == 'Y'; 3556 } 3557 3558 static int sr_notify(OSThread* osthread) { 3559 int status = thr_kill(osthread->thread_id(), ASYNC_SIGNAL); 3560 assert_status(status == 0, status, "thr_kill"); 3561 return status; 3562 } 3563 3564 // "Randomly" selected value for how long we want to spin 3565 // before bailing out on suspending a thread, also how often 3566 // we send a signal to a thread we want to resume 3567 static const int RANDOMLY_LARGE_INTEGER = 1000000; 3568 static const int RANDOMLY_LARGE_INTEGER2 = 100; 3569 3570 static bool do_suspend(OSThread* osthread) { 3571 assert(osthread->sr.is_running(), "thread should be running"); 3572 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 3573 3574 // mark as suspended and send signal 3575 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 3576 // failed to switch, state wasn't running? 3577 ShouldNotReachHere(); 3578 return false; 3579 } 3580 3581 if (sr_notify(osthread) != 0) { 3582 ShouldNotReachHere(); 3583 } 3584 3585 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 3586 while (true) { 3587 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) { 3588 break; 3589 } else { 3590 // timeout 3591 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 3592 if (cancelled == os::SuspendResume::SR_RUNNING) { 3593 return false; 3594 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 3595 // make sure that we consume the signal on the semaphore as well 3596 sr_semaphore.wait(); 3597 break; 3598 } else { 3599 ShouldNotReachHere(); 3600 return false; 3601 } 3602 } 3603 } 3604 3605 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 3606 return true; 3607 } 3608 3609 static void do_resume(OSThread* osthread) { 3610 assert(osthread->sr.is_suspended(), "thread should be suspended"); 3611 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 3612 3613 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 3614 // failed to switch to WAKEUP_REQUEST 3615 ShouldNotReachHere(); 3616 return; 3617 } 3618 3619 while (true) { 3620 if (sr_notify(osthread) == 0) { 3621 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 3622 if (osthread->sr.is_running()) { 3623 return; 3624 } 3625 } 3626 } else { 3627 ShouldNotReachHere(); 3628 } 3629 } 3630 3631 guarantee(osthread->sr.is_running(), "Must be running!"); 3632 } 3633 3634 void os::SuspendedThreadTask::internal_do_task() { 3635 if (do_suspend(_thread->osthread())) { 3636 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3637 do_task(context); 3638 do_resume(_thread->osthread()); 3639 } 3640 } 3641 3642 // This does not do anything on Solaris. This is basically a hook for being 3643 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 3644 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3645 const methodHandle& method, JavaCallArguments* args, 3646 Thread* thread) { 3647 f(value, method, args, thread); 3648 } 3649 3650 // This routine may be used by user applications as a "hook" to catch signals. 3651 // The user-defined signal handler must pass unrecognized signals to this 3652 // routine, and if it returns true (non-zero), then the signal handler must 3653 // return immediately. If the flag "abort_if_unrecognized" is true, then this 3654 // routine will never retun false (zero), but instead will execute a VM panic 3655 // routine kill the process. 3656 // 3657 // If this routine returns false, it is OK to call it again. This allows 3658 // the user-defined signal handler to perform checks either before or after 3659 // the VM performs its own checks. Naturally, the user code would be making 3660 // a serious error if it tried to handle an exception (such as a null check 3661 // or breakpoint) that the VM was generating for its own correct operation. 3662 // 3663 // This routine may recognize any of the following kinds of signals: 3664 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 3665 // ASYNC_SIGNAL. 3666 // It should be consulted by handlers for any of those signals. 3667 // 3668 // The caller of this routine must pass in the three arguments supplied 3669 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 3670 // field of the structure passed to sigaction(). This routine assumes that 3671 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3672 // 3673 // Note that the VM will print warnings if it detects conflicting signal 3674 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3675 // 3676 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo, 3677 siginfo_t* siginfo, 3678 void* ucontext, 3679 int abort_if_unrecognized); 3680 3681 3682 void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 3683 int orig_errno = errno; // Preserve errno value over signal handler. 3684 JVM_handle_solaris_signal(sig, info, ucVoid, true); 3685 errno = orig_errno; 3686 } 3687 3688 // This boolean allows users to forward their own non-matching signals 3689 // to JVM_handle_solaris_signal, harmlessly. 3690 bool os::Solaris::signal_handlers_are_installed = false; 3691 3692 // For signal-chaining 3693 bool os::Solaris::libjsig_is_loaded = false; 3694 typedef struct sigaction *(*get_signal_t)(int); 3695 get_signal_t os::Solaris::get_signal_action = NULL; 3696 3697 struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 3698 struct sigaction *actp = NULL; 3699 3700 if ((libjsig_is_loaded) && (sig <= Maxsignum)) { 3701 // Retrieve the old signal handler from libjsig 3702 actp = (*get_signal_action)(sig); 3703 } 3704 if (actp == NULL) { 3705 // Retrieve the preinstalled signal handler from jvm 3706 actp = get_preinstalled_handler(sig); 3707 } 3708 3709 return actp; 3710 } 3711 3712 static bool call_chained_handler(struct sigaction *actp, int sig, 3713 siginfo_t *siginfo, void *context) { 3714 // Call the old signal handler 3715 if (actp->sa_handler == SIG_DFL) { 3716 // It's more reasonable to let jvm treat it as an unexpected exception 3717 // instead of taking the default action. 3718 return false; 3719 } else if (actp->sa_handler != SIG_IGN) { 3720 if ((actp->sa_flags & SA_NODEFER) == 0) { 3721 // automaticlly block the signal 3722 sigaddset(&(actp->sa_mask), sig); 3723 } 3724 3725 sa_handler_t hand; 3726 sa_sigaction_t sa; 3727 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3728 // retrieve the chained handler 3729 if (siginfo_flag_set) { 3730 sa = actp->sa_sigaction; 3731 } else { 3732 hand = actp->sa_handler; 3733 } 3734 3735 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3736 actp->sa_handler = SIG_DFL; 3737 } 3738 3739 // try to honor the signal mask 3740 sigset_t oset; 3741 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3742 3743 // call into the chained handler 3744 if (siginfo_flag_set) { 3745 (*sa)(sig, siginfo, context); 3746 } else { 3747 (*hand)(sig); 3748 } 3749 3750 // restore the signal mask 3751 pthread_sigmask(SIG_SETMASK, &oset, 0); 3752 } 3753 // Tell jvm's signal handler the signal is taken care of. 3754 return true; 3755 } 3756 3757 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3758 bool chained = false; 3759 // signal-chaining 3760 if (UseSignalChaining) { 3761 struct sigaction *actp = get_chained_signal_action(sig); 3762 if (actp != NULL) { 3763 chained = call_chained_handler(actp, sig, siginfo, context); 3764 } 3765 } 3766 return chained; 3767 } 3768 3769 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 3770 assert((chainedsigactions != (struct sigaction *)NULL) && 3771 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3772 if (preinstalled_sigs[sig] != 0) { 3773 return &chainedsigactions[sig]; 3774 } 3775 return NULL; 3776 } 3777 3778 void os::Solaris::save_preinstalled_handler(int sig, 3779 struct sigaction& oldAct) { 3780 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 3781 assert((chainedsigactions != (struct sigaction *)NULL) && 3782 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3783 chainedsigactions[sig] = oldAct; 3784 preinstalled_sigs[sig] = 1; 3785 } 3786 3787 void os::Solaris::set_signal_handler(int sig, bool set_installed, 3788 bool oktochain) { 3789 // Check for overwrite. 3790 struct sigaction oldAct; 3791 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3792 void* oldhand = 3793 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3794 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3795 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3796 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3797 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 3798 if (AllowUserSignalHandlers || !set_installed) { 3799 // Do not overwrite; user takes responsibility to forward to us. 3800 return; 3801 } else if (UseSignalChaining) { 3802 if (oktochain) { 3803 // save the old handler in jvm 3804 save_preinstalled_handler(sig, oldAct); 3805 } else { 3806 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal."); 3807 } 3808 // libjsig also interposes the sigaction() call below and saves the 3809 // old sigaction on it own. 3810 } else { 3811 fatal("Encountered unexpected pre-existing sigaction handler " 3812 "%#lx for signal %d.", (long)oldhand, sig); 3813 } 3814 } 3815 3816 struct sigaction sigAct; 3817 sigfillset(&(sigAct.sa_mask)); 3818 sigAct.sa_handler = SIG_DFL; 3819 3820 sigAct.sa_sigaction = signalHandler; 3821 // Handle SIGSEGV on alternate signal stack if 3822 // not using stack banging 3823 if (!UseStackBanging && sig == SIGSEGV) { 3824 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 3825 } else { 3826 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 3827 } 3828 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 3829 3830 sigaction(sig, &sigAct, &oldAct); 3831 3832 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3833 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3834 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3835 } 3836 3837 3838 #define DO_SIGNAL_CHECK(sig) \ 3839 do { \ 3840 if (!sigismember(&check_signal_done, sig)) { \ 3841 os::Solaris::check_signal_handler(sig); \ 3842 } \ 3843 } while (0) 3844 3845 // This method is a periodic task to check for misbehaving JNI applications 3846 // under CheckJNI, we can add any periodic checks here 3847 3848 void os::run_periodic_checks() { 3849 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 3850 // thereby preventing a NULL checks. 3851 if (!check_addr0_done) check_addr0_done = check_addr0(tty); 3852 3853 if (check_signals == false) return; 3854 3855 // SEGV and BUS if overridden could potentially prevent 3856 // generation of hs*.log in the event of a crash, debugging 3857 // such a case can be very challenging, so we absolutely 3858 // check for the following for a good measure: 3859 DO_SIGNAL_CHECK(SIGSEGV); 3860 DO_SIGNAL_CHECK(SIGILL); 3861 DO_SIGNAL_CHECK(SIGFPE); 3862 DO_SIGNAL_CHECK(SIGBUS); 3863 DO_SIGNAL_CHECK(SIGPIPE); 3864 DO_SIGNAL_CHECK(SIGXFSZ); 3865 DO_SIGNAL_CHECK(ASYNC_SIGNAL); 3866 3867 // ReduceSignalUsage allows the user to override these handlers 3868 // see comments at the very top and jvm_solaris.h 3869 if (!ReduceSignalUsage) { 3870 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3871 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3872 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3873 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3874 } 3875 } 3876 3877 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3878 3879 static os_sigaction_t os_sigaction = NULL; 3880 3881 void os::Solaris::check_signal_handler(int sig) { 3882 char buf[O_BUFLEN]; 3883 address jvmHandler = NULL; 3884 3885 struct sigaction act; 3886 if (os_sigaction == NULL) { 3887 // only trust the default sigaction, in case it has been interposed 3888 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3889 if (os_sigaction == NULL) return; 3890 } 3891 3892 os_sigaction(sig, (struct sigaction*)NULL, &act); 3893 3894 address thisHandler = (act.sa_flags & SA_SIGINFO) 3895 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3896 : CAST_FROM_FN_PTR(address, act.sa_handler); 3897 3898 3899 switch (sig) { 3900 case SIGSEGV: 3901 case SIGBUS: 3902 case SIGFPE: 3903 case SIGPIPE: 3904 case SIGXFSZ: 3905 case SIGILL: 3906 case ASYNC_SIGNAL: 3907 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 3908 break; 3909 3910 case SHUTDOWN1_SIGNAL: 3911 case SHUTDOWN2_SIGNAL: 3912 case SHUTDOWN3_SIGNAL: 3913 case BREAK_SIGNAL: 3914 jvmHandler = (address)user_handler(); 3915 break; 3916 3917 default: 3918 return; 3919 } 3920 3921 if (thisHandler != jvmHandler) { 3922 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3923 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3924 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3925 // No need to check this sig any longer 3926 sigaddset(&check_signal_done, sig); 3927 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3928 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3929 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3930 exception_name(sig, buf, O_BUFLEN)); 3931 } 3932 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 3933 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3934 tty->print("expected:"); 3935 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig)); 3936 tty->cr(); 3937 tty->print(" found:"); 3938 os::Posix::print_sa_flags(tty, act.sa_flags); 3939 tty->cr(); 3940 // No need to check this sig any longer 3941 sigaddset(&check_signal_done, sig); 3942 } 3943 3944 // Print all the signal handler state 3945 if (sigismember(&check_signal_done, sig)) { 3946 print_signal_handlers(tty, buf, O_BUFLEN); 3947 } 3948 3949 } 3950 3951 void os::Solaris::install_signal_handlers() { 3952 signal_handlers_are_installed = true; 3953 3954 // signal-chaining 3955 typedef void (*signal_setting_t)(); 3956 signal_setting_t begin_signal_setting = NULL; 3957 signal_setting_t end_signal_setting = NULL; 3958 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3959 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3960 if (begin_signal_setting != NULL) { 3961 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3962 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3963 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3964 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3965 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t, 3966 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version")); 3967 libjsig_is_loaded = true; 3968 if (os::Solaris::get_libjsig_version != NULL) { 3969 int libjsigversion = (*os::Solaris::get_libjsig_version)(); 3970 assert(libjsigversion == JSIG_VERSION_1_4_1, "libjsig version mismatch"); 3971 } 3972 assert(UseSignalChaining, "should enable signal-chaining"); 3973 } 3974 if (libjsig_is_loaded) { 3975 // Tell libjsig jvm is setting signal handlers 3976 (*begin_signal_setting)(); 3977 } 3978 3979 set_signal_handler(SIGSEGV, true, true); 3980 set_signal_handler(SIGPIPE, true, true); 3981 set_signal_handler(SIGXFSZ, true, true); 3982 set_signal_handler(SIGBUS, true, true); 3983 set_signal_handler(SIGILL, true, true); 3984 set_signal_handler(SIGFPE, true, true); 3985 set_signal_handler(ASYNC_SIGNAL, true, true); 3986 3987 if (libjsig_is_loaded) { 3988 // Tell libjsig jvm finishes setting signal handlers 3989 (*end_signal_setting)(); 3990 } 3991 3992 // We don't activate signal checker if libjsig is in place, we trust ourselves 3993 // and if UserSignalHandler is installed all bets are off. 3994 // Log that signal checking is off only if -verbose:jni is specified. 3995 if (CheckJNICalls) { 3996 if (libjsig_is_loaded) { 3997 if (PrintJNIResolving) { 3998 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3999 } 4000 check_signals = false; 4001 } 4002 if (AllowUserSignalHandlers) { 4003 if (PrintJNIResolving) { 4004 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4005 } 4006 check_signals = false; 4007 } 4008 } 4009 } 4010 4011 4012 void report_error(const char* file_name, int line_no, const char* title, 4013 const char* format, ...); 4014 4015 // (Static) wrappers for the liblgrp API 4016 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 4017 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 4018 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 4019 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 4020 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 4021 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 4022 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 4023 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 4024 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 4025 4026 static address resolve_symbol_lazy(const char* name) { 4027 address addr = (address) dlsym(RTLD_DEFAULT, name); 4028 if (addr == NULL) { 4029 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 4030 addr = (address) dlsym(RTLD_NEXT, name); 4031 } 4032 return addr; 4033 } 4034 4035 static address resolve_symbol(const char* name) { 4036 address addr = resolve_symbol_lazy(name); 4037 if (addr == NULL) { 4038 fatal(dlerror()); 4039 } 4040 return addr; 4041 } 4042 4043 void os::Solaris::libthread_init() { 4044 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 4045 4046 lwp_priocntl_init(); 4047 4048 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 4049 if (func == NULL) { 4050 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 4051 // Guarantee that this VM is running on an new enough OS (5.6 or 4052 // later) that it will have a new enough libthread.so. 4053 guarantee(func != NULL, "libthread.so is too old."); 4054 } 4055 4056 int size; 4057 void (*handler_info_func)(address *, int *); 4058 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 4059 handler_info_func(&handler_start, &size); 4060 handler_end = handler_start + size; 4061 } 4062 4063 4064 int_fnP_mutex_tP os::Solaris::_mutex_lock; 4065 int_fnP_mutex_tP os::Solaris::_mutex_trylock; 4066 int_fnP_mutex_tP os::Solaris::_mutex_unlock; 4067 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 4068 int_fnP_mutex_tP os::Solaris::_mutex_destroy; 4069 int os::Solaris::_mutex_scope = USYNC_THREAD; 4070 4071 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 4072 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 4073 int_fnP_cond_tP os::Solaris::_cond_signal; 4074 int_fnP_cond_tP os::Solaris::_cond_broadcast; 4075 int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 4076 int_fnP_cond_tP os::Solaris::_cond_destroy; 4077 int os::Solaris::_cond_scope = USYNC_THREAD; 4078 bool os::Solaris::_synchronization_initialized; 4079 4080 void os::Solaris::synchronization_init() { 4081 if (UseLWPSynchronization) { 4082 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 4083 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 4084 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 4085 os::Solaris::set_mutex_init(lwp_mutex_init); 4086 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 4087 os::Solaris::set_mutex_scope(USYNC_THREAD); 4088 4089 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 4090 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 4091 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 4092 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 4093 os::Solaris::set_cond_init(lwp_cond_init); 4094 os::Solaris::set_cond_destroy(lwp_cond_destroy); 4095 os::Solaris::set_cond_scope(USYNC_THREAD); 4096 } else { 4097 os::Solaris::set_mutex_scope(USYNC_THREAD); 4098 os::Solaris::set_cond_scope(USYNC_THREAD); 4099 4100 if (UsePthreads) { 4101 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 4102 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 4103 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 4104 os::Solaris::set_mutex_init(pthread_mutex_default_init); 4105 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 4106 4107 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 4108 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 4109 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 4110 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 4111 os::Solaris::set_cond_init(pthread_cond_default_init); 4112 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 4113 } else { 4114 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 4115 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 4116 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 4117 os::Solaris::set_mutex_init(::mutex_init); 4118 os::Solaris::set_mutex_destroy(::mutex_destroy); 4119 4120 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 4121 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 4122 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 4123 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 4124 os::Solaris::set_cond_init(::cond_init); 4125 os::Solaris::set_cond_destroy(::cond_destroy); 4126 } 4127 } 4128 _synchronization_initialized = true; 4129 } 4130 4131 bool os::Solaris::liblgrp_init() { 4132 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 4133 if (handle != NULL) { 4134 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 4135 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 4136 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 4137 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 4138 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 4139 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 4140 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 4141 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 4142 dlsym(handle, "lgrp_cookie_stale"))); 4143 4144 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 4145 set_lgrp_cookie(c); 4146 return true; 4147 } 4148 return false; 4149 } 4150 4151 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 4152 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 4153 static pset_getloadavg_type pset_getloadavg_ptr = NULL; 4154 4155 void init_pset_getloadavg_ptr(void) { 4156 pset_getloadavg_ptr = 4157 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 4158 if (pset_getloadavg_ptr == NULL) { 4159 log_warning(os)("pset_getloadavg function not found"); 4160 } 4161 } 4162 4163 int os::Solaris::_dev_zero_fd = -1; 4164 4165 // this is called _before_ the global arguments have been parsed 4166 void os::init(void) { 4167 _initial_pid = getpid(); 4168 4169 max_hrtime = first_hrtime = gethrtime(); 4170 4171 init_random(1234567); 4172 4173 page_size = sysconf(_SC_PAGESIZE); 4174 if (page_size == -1) { 4175 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 4176 } 4177 init_page_sizes((size_t) page_size); 4178 4179 Solaris::initialize_system_info(); 4180 4181 int fd = ::open("/dev/zero", O_RDWR); 4182 if (fd < 0) { 4183 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno)); 4184 } else { 4185 Solaris::set_dev_zero_fd(fd); 4186 4187 // Close on exec, child won't inherit. 4188 fcntl(fd, F_SETFD, FD_CLOEXEC); 4189 } 4190 4191 clock_tics_per_sec = CLK_TCK; 4192 4193 // check if dladdr1() exists; dladdr1 can provide more information than 4194 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 4195 // and is available on linker patches for 5.7 and 5.8. 4196 // libdl.so must have been loaded, this call is just an entry lookup 4197 void * hdl = dlopen("libdl.so", RTLD_NOW); 4198 if (hdl) { 4199 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 4200 } 4201 4202 main_thread = thr_self(); 4203 4204 // dynamic lookup of functions that may not be available in our lowest 4205 // supported Solaris release 4206 void * handle = dlopen("libc.so.1", RTLD_LAZY); 4207 if (handle != NULL) { 4208 Solaris::_pthread_setname_np = // from 11.3 4209 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np"); 4210 } 4211 } 4212 4213 // To install functions for atexit system call 4214 extern "C" { 4215 static void perfMemory_exit_helper() { 4216 perfMemory_exit(); 4217 } 4218 } 4219 4220 // this is called _after_ the global arguments have been parsed 4221 jint os::init_2(void) { 4222 // try to enable extended file IO ASAP, see 6431278 4223 os::Solaris::try_enable_extended_io(); 4224 4225 // Allocate a single page and mark it as readable for safepoint polling. Also 4226 // use this first mmap call to check support for MAP_ALIGN. 4227 address polling_page = (address)Solaris::mmap_chunk((char*)page_size, 4228 page_size, 4229 MAP_PRIVATE | MAP_ALIGN, 4230 PROT_READ); 4231 if (polling_page == NULL) { 4232 has_map_align = false; 4233 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, 4234 PROT_READ); 4235 } 4236 4237 os::set_polling_page(polling_page); 4238 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page)); 4239 4240 if (!UseMembar) { 4241 address mem_serialize_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE); 4242 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 4243 os::set_memory_serialize_page(mem_serialize_page); 4244 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page)); 4245 } 4246 4247 // Check and sets minimum stack sizes against command line options 4248 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 4249 return JNI_ERR; 4250 } 4251 4252 Solaris::libthread_init(); 4253 4254 if (UseNUMA) { 4255 if (!Solaris::liblgrp_init()) { 4256 UseNUMA = false; 4257 } else { 4258 size_t lgrp_limit = os::numa_get_groups_num(); 4259 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); 4260 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 4261 FREE_C_HEAP_ARRAY(int, lgrp_ids); 4262 if (lgrp_num < 2) { 4263 // There's only one locality group, disable NUMA. 4264 UseNUMA = false; 4265 } 4266 } 4267 if (!UseNUMA && ForceNUMA) { 4268 UseNUMA = true; 4269 } 4270 } 4271 4272 Solaris::signal_sets_init(); 4273 Solaris::init_signal_mem(); 4274 Solaris::install_signal_handlers(); 4275 4276 // initialize synchronization primitives to use either thread or 4277 // lwp synchronization (controlled by UseLWPSynchronization) 4278 Solaris::synchronization_init(); 4279 4280 if (MaxFDLimit) { 4281 // set the number of file descriptors to max. print out error 4282 // if getrlimit/setrlimit fails but continue regardless. 4283 struct rlimit nbr_files; 4284 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 4285 if (status != 0) { 4286 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 4287 } else { 4288 nbr_files.rlim_cur = nbr_files.rlim_max; 4289 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 4290 if (status != 0) { 4291 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 4292 } 4293 } 4294 } 4295 4296 // Calculate theoretical max. size of Threads to guard gainst 4297 // artifical out-of-memory situations, where all available address- 4298 // space has been reserved by thread stacks. Default stack size is 1Mb. 4299 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 4300 JavaThread::stack_size_at_create() : (1*K*K); 4301 assert(pre_thread_stack_size != 0, "Must have a stack"); 4302 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 4303 // we should start doing Virtual Memory banging. Currently when the threads will 4304 // have used all but 200Mb of space. 4305 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 4306 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 4307 4308 // at-exit methods are called in the reverse order of their registration. 4309 // In Solaris 7 and earlier, atexit functions are called on return from 4310 // main or as a result of a call to exit(3C). There can be only 32 of 4311 // these functions registered and atexit() does not set errno. In Solaris 4312 // 8 and later, there is no limit to the number of functions registered 4313 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 4314 // functions are called upon dlclose(3DL) in addition to return from main 4315 // and exit(3C). 4316 4317 if (PerfAllowAtExitRegistration) { 4318 // only register atexit functions if PerfAllowAtExitRegistration is set. 4319 // atexit functions can be delayed until process exit time, which 4320 // can be problematic for embedded VM situations. Embedded VMs should 4321 // call DestroyJavaVM() to assure that VM resources are released. 4322 4323 // note: perfMemory_exit_helper atexit function may be removed in 4324 // the future if the appropriate cleanup code can be added to the 4325 // VM_Exit VMOperation's doit method. 4326 if (atexit(perfMemory_exit_helper) != 0) { 4327 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 4328 } 4329 } 4330 4331 // Init pset_loadavg function pointer 4332 init_pset_getloadavg_ptr(); 4333 4334 return JNI_OK; 4335 } 4336 4337 // Mark the polling page as unreadable 4338 void os::make_polling_page_unreadable(void) { 4339 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) { 4340 fatal("Could not disable polling page"); 4341 } 4342 } 4343 4344 // Mark the polling page as readable 4345 void os::make_polling_page_readable(void) { 4346 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) { 4347 fatal("Could not enable polling page"); 4348 } 4349 } 4350 4351 // Is a (classpath) directory empty? 4352 bool os::dir_is_empty(const char* path) { 4353 DIR *dir = NULL; 4354 struct dirent *ptr; 4355 4356 dir = opendir(path); 4357 if (dir == NULL) return true; 4358 4359 // Scan the directory 4360 bool result = true; 4361 char buf[sizeof(struct dirent) + MAX_PATH]; 4362 struct dirent *dbuf = (struct dirent *) buf; 4363 while (result && (ptr = readdir(dir, dbuf)) != NULL) { 4364 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 4365 result = false; 4366 } 4367 } 4368 closedir(dir); 4369 return result; 4370 } 4371 4372 // This code originates from JDK's sysOpen and open64_w 4373 // from src/solaris/hpi/src/system_md.c 4374 4375 int os::open(const char *path, int oflag, int mode) { 4376 if (strlen(path) > MAX_PATH - 1) { 4377 errno = ENAMETOOLONG; 4378 return -1; 4379 } 4380 int fd; 4381 4382 fd = ::open64(path, oflag, mode); 4383 if (fd == -1) return -1; 4384 4385 // If the open succeeded, the file might still be a directory 4386 { 4387 struct stat64 buf64; 4388 int ret = ::fstat64(fd, &buf64); 4389 int st_mode = buf64.st_mode; 4390 4391 if (ret != -1) { 4392 if ((st_mode & S_IFMT) == S_IFDIR) { 4393 errno = EISDIR; 4394 ::close(fd); 4395 return -1; 4396 } 4397 } else { 4398 ::close(fd); 4399 return -1; 4400 } 4401 } 4402 4403 // 32-bit Solaris systems suffer from: 4404 // 4405 // - an historical default soft limit of 256 per-process file 4406 // descriptors that is too low for many Java programs. 4407 // 4408 // - a design flaw where file descriptors created using stdio 4409 // fopen must be less than 256, _even_ when the first limit above 4410 // has been raised. This can cause calls to fopen (but not calls to 4411 // open, for example) to fail mysteriously, perhaps in 3rd party 4412 // native code (although the JDK itself uses fopen). One can hardly 4413 // criticize them for using this most standard of all functions. 4414 // 4415 // We attempt to make everything work anyways by: 4416 // 4417 // - raising the soft limit on per-process file descriptors beyond 4418 // 256 4419 // 4420 // - As of Solaris 10u4, we can request that Solaris raise the 256 4421 // stdio fopen limit by calling function enable_extended_FILE_stdio. 4422 // This is done in init_2 and recorded in enabled_extended_FILE_stdio 4423 // 4424 // - If we are stuck on an old (pre 10u4) Solaris system, we can 4425 // workaround the bug by remapping non-stdio file descriptors below 4426 // 256 to ones beyond 256, which is done below. 4427 // 4428 // See: 4429 // 1085341: 32-bit stdio routines should support file descriptors >255 4430 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files 4431 // 6431278: Netbeans crash on 32 bit Solaris: need to call 4432 // enable_extended_FILE_stdio() in VM initialisation 4433 // Giri Mandalika's blog 4434 // http://technopark02.blogspot.com/2005_05_01_archive.html 4435 // 4436 #ifndef _LP64 4437 if ((!enabled_extended_FILE_stdio) && fd < 256) { 4438 int newfd = ::fcntl(fd, F_DUPFD, 256); 4439 if (newfd != -1) { 4440 ::close(fd); 4441 fd = newfd; 4442 } 4443 } 4444 #endif // 32-bit Solaris 4445 4446 // All file descriptors that are opened in the JVM and not 4447 // specifically destined for a subprocess should have the 4448 // close-on-exec flag set. If we don't set it, then careless 3rd 4449 // party native code might fork and exec without closing all 4450 // appropriate file descriptors (e.g. as we do in closeDescriptors in 4451 // UNIXProcess.c), and this in turn might: 4452 // 4453 // - cause end-of-file to fail to be detected on some file 4454 // descriptors, resulting in mysterious hangs, or 4455 // 4456 // - might cause an fopen in the subprocess to fail on a system 4457 // suffering from bug 1085341. 4458 // 4459 // (Yes, the default setting of the close-on-exec flag is a Unix 4460 // design flaw) 4461 // 4462 // See: 4463 // 1085341: 32-bit stdio routines should support file descriptors >255 4464 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 4465 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 4466 // 4467 #ifdef FD_CLOEXEC 4468 { 4469 int flags = ::fcntl(fd, F_GETFD); 4470 if (flags != -1) { 4471 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 4472 } 4473 } 4474 #endif 4475 4476 return fd; 4477 } 4478 4479 // create binary file, rewriting existing file if required 4480 int os::create_binary_file(const char* path, bool rewrite_existing) { 4481 int oflags = O_WRONLY | O_CREAT; 4482 if (!rewrite_existing) { 4483 oflags |= O_EXCL; 4484 } 4485 return ::open64(path, oflags, S_IREAD | S_IWRITE); 4486 } 4487 4488 // return current position of file pointer 4489 jlong os::current_file_offset(int fd) { 4490 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 4491 } 4492 4493 // move file pointer to the specified offset 4494 jlong os::seek_to_file_offset(int fd, jlong offset) { 4495 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 4496 } 4497 4498 jlong os::lseek(int fd, jlong offset, int whence) { 4499 return (jlong) ::lseek64(fd, offset, whence); 4500 } 4501 4502 char * os::native_path(char *path) { 4503 return path; 4504 } 4505 4506 int os::ftruncate(int fd, jlong length) { 4507 return ::ftruncate64(fd, length); 4508 } 4509 4510 int os::fsync(int fd) { 4511 RESTARTABLE_RETURN_INT(::fsync(fd)); 4512 } 4513 4514 int os::available(int fd, jlong *bytes) { 4515 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 4516 "Assumed _thread_in_native"); 4517 jlong cur, end; 4518 int mode; 4519 struct stat64 buf64; 4520 4521 if (::fstat64(fd, &buf64) >= 0) { 4522 mode = buf64.st_mode; 4523 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 4524 int n,ioctl_return; 4525 4526 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return); 4527 if (ioctl_return>= 0) { 4528 *bytes = n; 4529 return 1; 4530 } 4531 } 4532 } 4533 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 4534 return 0; 4535 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 4536 return 0; 4537 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 4538 return 0; 4539 } 4540 *bytes = end - cur; 4541 return 1; 4542 } 4543 4544 // Map a block of memory. 4545 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4546 char *addr, size_t bytes, bool read_only, 4547 bool allow_exec) { 4548 int prot; 4549 int flags; 4550 4551 if (read_only) { 4552 prot = PROT_READ; 4553 flags = MAP_SHARED; 4554 } else { 4555 prot = PROT_READ | PROT_WRITE; 4556 flags = MAP_PRIVATE; 4557 } 4558 4559 if (allow_exec) { 4560 prot |= PROT_EXEC; 4561 } 4562 4563 if (addr != NULL) { 4564 flags |= MAP_FIXED; 4565 } 4566 4567 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 4568 fd, file_offset); 4569 if (mapped_address == MAP_FAILED) { 4570 return NULL; 4571 } 4572 return mapped_address; 4573 } 4574 4575 4576 // Remap a block of memory. 4577 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4578 char *addr, size_t bytes, bool read_only, 4579 bool allow_exec) { 4580 // same as map_memory() on this OS 4581 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4582 allow_exec); 4583 } 4584 4585 4586 // Unmap a block of memory. 4587 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4588 return munmap(addr, bytes) == 0; 4589 } 4590 4591 void os::pause() { 4592 char filename[MAX_PATH]; 4593 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4594 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4595 } else { 4596 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4597 } 4598 4599 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4600 if (fd != -1) { 4601 struct stat buf; 4602 ::close(fd); 4603 while (::stat(filename, &buf) == 0) { 4604 (void)::poll(NULL, 0, 100); 4605 } 4606 } else { 4607 jio_fprintf(stderr, 4608 "Could not open pause file '%s', continuing immediately.\n", filename); 4609 } 4610 } 4611 4612 #ifndef PRODUCT 4613 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4614 // Turn this on if you need to trace synch operations. 4615 // Set RECORD_SYNCH_LIMIT to a large-enough value, 4616 // and call record_synch_enable and record_synch_disable 4617 // around the computation of interest. 4618 4619 void record_synch(char* name, bool returning); // defined below 4620 4621 class RecordSynch { 4622 char* _name; 4623 public: 4624 RecordSynch(char* name) :_name(name) { record_synch(_name, false); } 4625 ~RecordSynch() { record_synch(_name, true); } 4626 }; 4627 4628 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 4629 extern "C" ret name params { \ 4630 typedef ret name##_t params; \ 4631 static name##_t* implem = NULL; \ 4632 static int callcount = 0; \ 4633 if (implem == NULL) { \ 4634 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 4635 if (implem == NULL) fatal(dlerror()); \ 4636 } \ 4637 ++callcount; \ 4638 RecordSynch _rs(#name); \ 4639 inner; \ 4640 return implem args; \ 4641 } 4642 // in dbx, examine callcounts this way: 4643 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 4644 4645 #define CHECK_POINTER_OK(p) \ 4646 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) 4647 #define CHECK_MU \ 4648 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 4649 #define CHECK_CV \ 4650 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 4651 #define CHECK_P(p) \ 4652 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 4653 4654 #define CHECK_MUTEX(mutex_op) \ 4655 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 4656 4657 CHECK_MUTEX( mutex_lock) 4658 CHECK_MUTEX( _mutex_lock) 4659 CHECK_MUTEX( mutex_unlock) 4660 CHECK_MUTEX(_mutex_unlock) 4661 CHECK_MUTEX( mutex_trylock) 4662 CHECK_MUTEX(_mutex_trylock) 4663 4664 #define CHECK_COND(cond_op) \ 4665 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV); 4666 4667 CHECK_COND( cond_wait); 4668 CHECK_COND(_cond_wait); 4669 CHECK_COND(_cond_wait_cancel); 4670 4671 #define CHECK_COND2(cond_op) \ 4672 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV); 4673 4674 CHECK_COND2( cond_timedwait); 4675 CHECK_COND2(_cond_timedwait); 4676 CHECK_COND2(_cond_timedwait_cancel); 4677 4678 // do the _lwp_* versions too 4679 #define mutex_t lwp_mutex_t 4680 #define cond_t lwp_cond_t 4681 CHECK_MUTEX( _lwp_mutex_lock) 4682 CHECK_MUTEX( _lwp_mutex_unlock) 4683 CHECK_MUTEX( _lwp_mutex_trylock) 4684 CHECK_MUTEX( __lwp_mutex_lock) 4685 CHECK_MUTEX( __lwp_mutex_unlock) 4686 CHECK_MUTEX( __lwp_mutex_trylock) 4687 CHECK_MUTEX(___lwp_mutex_lock) 4688 CHECK_MUTEX(___lwp_mutex_unlock) 4689 4690 CHECK_COND( _lwp_cond_wait); 4691 CHECK_COND( __lwp_cond_wait); 4692 CHECK_COND(___lwp_cond_wait); 4693 4694 CHECK_COND2( _lwp_cond_timedwait); 4695 CHECK_COND2( __lwp_cond_timedwait); 4696 #undef mutex_t 4697 #undef cond_t 4698 4699 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4700 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4701 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 4702 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 4703 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4704 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4705 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4706 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4707 4708 4709 // recording machinery: 4710 4711 enum { RECORD_SYNCH_LIMIT = 200 }; 4712 char* record_synch_name[RECORD_SYNCH_LIMIT]; 4713 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 4714 bool record_synch_returning[RECORD_SYNCH_LIMIT]; 4715 thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 4716 int record_synch_count = 0; 4717 bool record_synch_enabled = false; 4718 4719 // in dbx, examine recorded data this way: 4720 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 4721 4722 void record_synch(char* name, bool returning) { 4723 if (record_synch_enabled) { 4724 if (record_synch_count < RECORD_SYNCH_LIMIT) { 4725 record_synch_name[record_synch_count] = name; 4726 record_synch_returning[record_synch_count] = returning; 4727 record_synch_thread[record_synch_count] = thr_self(); 4728 record_synch_arg0ptr[record_synch_count] = &name; 4729 record_synch_count++; 4730 } 4731 // put more checking code here: 4732 // ... 4733 } 4734 } 4735 4736 void record_synch_enable() { 4737 // start collecting trace data, if not already doing so 4738 if (!record_synch_enabled) record_synch_count = 0; 4739 record_synch_enabled = true; 4740 } 4741 4742 void record_synch_disable() { 4743 // stop collecting trace data 4744 record_synch_enabled = false; 4745 } 4746 4747 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4748 #endif // PRODUCT 4749 4750 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4751 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 4752 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4753 4754 4755 // JVMTI & JVM monitoring and management support 4756 // The thread_cpu_time() and current_thread_cpu_time() are only 4757 // supported if is_thread_cpu_time_supported() returns true. 4758 // They are not supported on Solaris T1. 4759 4760 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4761 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4762 // of a thread. 4763 // 4764 // current_thread_cpu_time() and thread_cpu_time(Thread *) 4765 // returns the fast estimate available on the platform. 4766 4767 // hrtime_t gethrvtime() return value includes 4768 // user time but does not include system time 4769 jlong os::current_thread_cpu_time() { 4770 return (jlong) gethrvtime(); 4771 } 4772 4773 jlong os::thread_cpu_time(Thread *thread) { 4774 // return user level CPU time only to be consistent with 4775 // what current_thread_cpu_time returns. 4776 // thread_cpu_time_info() must be changed if this changes 4777 return os::thread_cpu_time(thread, false /* user time only */); 4778 } 4779 4780 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4781 if (user_sys_cpu_time) { 4782 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4783 } else { 4784 return os::current_thread_cpu_time(); 4785 } 4786 } 4787 4788 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 4789 char proc_name[64]; 4790 int count; 4791 prusage_t prusage; 4792 jlong lwp_time; 4793 int fd; 4794 4795 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 4796 getpid(), 4797 thread->osthread()->lwp_id()); 4798 fd = ::open(proc_name, O_RDONLY); 4799 if (fd == -1) return -1; 4800 4801 do { 4802 count = ::pread(fd, 4803 (void *)&prusage.pr_utime, 4804 thr_time_size, 4805 thr_time_off); 4806 } while (count < 0 && errno == EINTR); 4807 ::close(fd); 4808 if (count < 0) return -1; 4809 4810 if (user_sys_cpu_time) { 4811 // user + system CPU time 4812 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 4813 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 4814 (jlong)prusage.pr_stime.tv_nsec + 4815 (jlong)prusage.pr_utime.tv_nsec; 4816 } else { 4817 // user level CPU time only 4818 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 4819 (jlong)prusage.pr_utime.tv_nsec; 4820 } 4821 4822 return (lwp_time); 4823 } 4824 4825 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4826 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4827 info_ptr->may_skip_backward = false; // elapsed time not wall time 4828 info_ptr->may_skip_forward = false; // elapsed time not wall time 4829 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4830 } 4831 4832 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4833 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4834 info_ptr->may_skip_backward = false; // elapsed time not wall time 4835 info_ptr->may_skip_forward = false; // elapsed time not wall time 4836 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4837 } 4838 4839 bool os::is_thread_cpu_time_supported() { 4840 return true; 4841 } 4842 4843 // System loadavg support. Returns -1 if load average cannot be obtained. 4844 // Return the load average for our processor set if the primitive exists 4845 // (Solaris 9 and later). Otherwise just return system wide loadavg. 4846 int os::loadavg(double loadavg[], int nelem) { 4847 if (pset_getloadavg_ptr != NULL) { 4848 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 4849 } else { 4850 return ::getloadavg(loadavg, nelem); 4851 } 4852 } 4853 4854 //--------------------------------------------------------------------------------- 4855 4856 bool os::find(address addr, outputStream* st) { 4857 Dl_info dlinfo; 4858 memset(&dlinfo, 0, sizeof(dlinfo)); 4859 if (dladdr(addr, &dlinfo) != 0) { 4860 st->print(PTR_FORMAT ": ", addr); 4861 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 4862 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 4863 } else if (dlinfo.dli_fbase != NULL) { 4864 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 4865 } else { 4866 st->print("<absolute address>"); 4867 } 4868 if (dlinfo.dli_fname != NULL) { 4869 st->print(" in %s", dlinfo.dli_fname); 4870 } 4871 if (dlinfo.dli_fbase != NULL) { 4872 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 4873 } 4874 st->cr(); 4875 4876 if (Verbose) { 4877 // decode some bytes around the PC 4878 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 4879 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 4880 address lowest = (address) dlinfo.dli_sname; 4881 if (!lowest) lowest = (address) dlinfo.dli_fbase; 4882 if (begin < lowest) begin = lowest; 4883 Dl_info dlinfo2; 4884 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 4885 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 4886 end = (address) dlinfo2.dli_saddr; 4887 } 4888 Disassembler::decode(begin, end, st); 4889 } 4890 return true; 4891 } 4892 return false; 4893 } 4894 4895 // Following function has been added to support HotSparc's libjvm.so running 4896 // under Solaris production JDK 1.2.2 / 1.3.0. These came from 4897 // src/solaris/hpi/native_threads in the EVM codebase. 4898 // 4899 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 4900 // libraries and should thus be removed. We will leave it behind for a while 4901 // until we no longer want to able to run on top of 1.3.0 Solaris production 4902 // JDK. See 4341971. 4903 4904 #define STACK_SLACK 0x800 4905 4906 extern "C" { 4907 intptr_t sysThreadAvailableStackWithSlack() { 4908 stack_t st; 4909 intptr_t retval, stack_top; 4910 retval = thr_stksegment(&st); 4911 assert(retval == 0, "incorrect return value from thr_stksegment"); 4912 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 4913 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 4914 stack_top=(intptr_t)st.ss_sp-st.ss_size; 4915 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 4916 } 4917 } 4918 4919 // ObjectMonitor park-unpark infrastructure ... 4920 // 4921 // We implement Solaris and Linux PlatformEvents with the 4922 // obvious condvar-mutex-flag triple. 4923 // Another alternative that works quite well is pipes: 4924 // Each PlatformEvent consists of a pipe-pair. 4925 // The thread associated with the PlatformEvent 4926 // calls park(), which reads from the input end of the pipe. 4927 // Unpark() writes into the other end of the pipe. 4928 // The write-side of the pipe must be set NDELAY. 4929 // Unfortunately pipes consume a large # of handles. 4930 // Native solaris lwp_park() and lwp_unpark() work nicely, too. 4931 // Using pipes for the 1st few threads might be workable, however. 4932 // 4933 // park() is permitted to return spuriously. 4934 // Callers of park() should wrap the call to park() in 4935 // an appropriate loop. A litmus test for the correct 4936 // usage of park is the following: if park() were modified 4937 // to immediately return 0 your code should still work, 4938 // albeit degenerating to a spin loop. 4939 // 4940 // In a sense, park()-unpark() just provides more polite spinning 4941 // and polling with the key difference over naive spinning being 4942 // that a parked thread needs to be explicitly unparked() in order 4943 // to wake up and to poll the underlying condition. 4944 // 4945 // Assumption: 4946 // Only one parker can exist on an event, which is why we allocate 4947 // them per-thread. Multiple unparkers can coexist. 4948 // 4949 // _Event transitions in park() 4950 // -1 => -1 : illegal 4951 // 1 => 0 : pass - return immediately 4952 // 0 => -1 : block; then set _Event to 0 before returning 4953 // 4954 // _Event transitions in unpark() 4955 // 0 => 1 : just return 4956 // 1 => 1 : just return 4957 // -1 => either 0 or 1; must signal target thread 4958 // That is, we can safely transition _Event from -1 to either 4959 // 0 or 1. 4960 // 4961 // _Event serves as a restricted-range semaphore. 4962 // -1 : thread is blocked, i.e. there is a waiter 4963 // 0 : neutral: thread is running or ready, 4964 // could have been signaled after a wait started 4965 // 1 : signaled - thread is running or ready 4966 // 4967 // Another possible encoding of _Event would be with 4968 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 4969 // 4970 // TODO-FIXME: add DTRACE probes for: 4971 // 1. Tx parks 4972 // 2. Ty unparks Tx 4973 // 3. Tx resumes from park 4974 4975 4976 // value determined through experimentation 4977 #define ROUNDINGFIX 11 4978 4979 // utility to compute the abstime argument to timedwait. 4980 // TODO-FIXME: switch from compute_abstime() to unpackTime(). 4981 4982 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 4983 // millis is the relative timeout time 4984 // abstime will be the absolute timeout time 4985 if (millis < 0) millis = 0; 4986 struct timeval now; 4987 int status = gettimeofday(&now, NULL); 4988 assert(status == 0, "gettimeofday"); 4989 jlong seconds = millis / 1000; 4990 jlong max_wait_period; 4991 4992 if (UseLWPSynchronization) { 4993 // forward port of fix for 4275818 (not sleeping long enough) 4994 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 4995 // _lwp_cond_timedwait() used a round_down algorithm rather 4996 // than a round_up. For millis less than our roundfactor 4997 // it rounded down to 0 which doesn't meet the spec. 4998 // For millis > roundfactor we may return a bit sooner, but 4999 // since we can not accurately identify the patch level and 5000 // this has already been fixed in Solaris 9 and 8 we will 5001 // leave it alone rather than always rounding down. 5002 5003 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 5004 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 5005 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 5006 max_wait_period = 21000000; 5007 } else { 5008 max_wait_period = 50000000; 5009 } 5010 millis %= 1000; 5011 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 5012 seconds = max_wait_period; 5013 } 5014 abstime->tv_sec = now.tv_sec + seconds; 5015 long usec = now.tv_usec + millis * 1000; 5016 if (usec >= 1000000) { 5017 abstime->tv_sec += 1; 5018 usec -= 1000000; 5019 } 5020 abstime->tv_nsec = usec * 1000; 5021 return abstime; 5022 } 5023 5024 void os::PlatformEvent::park() { // AKA: down() 5025 // Transitions for _Event: 5026 // -1 => -1 : illegal 5027 // 1 => 0 : pass - return immediately 5028 // 0 => -1 : block; then set _Event to 0 before returning 5029 5030 // Invariant: Only the thread associated with the Event/PlatformEvent 5031 // may call park(). 5032 assert(_nParked == 0, "invariant"); 5033 5034 int v; 5035 for (;;) { 5036 v = _Event; 5037 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5038 } 5039 guarantee(v >= 0, "invariant"); 5040 if (v == 0) { 5041 // Do this the hard way by blocking ... 5042 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5043 int status = os::Solaris::mutex_lock(_mutex); 5044 assert_status(status == 0, status, "mutex_lock"); 5045 guarantee(_nParked == 0, "invariant"); 5046 ++_nParked; 5047 while (_Event < 0) { 5048 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 5049 // Treat this the same as if the wait was interrupted 5050 // With usr/lib/lwp going to kernel, always handle ETIME 5051 status = os::Solaris::cond_wait(_cond, _mutex); 5052 if (status == ETIME) status = EINTR; 5053 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 5054 } 5055 --_nParked; 5056 _Event = 0; 5057 status = os::Solaris::mutex_unlock(_mutex); 5058 assert_status(status == 0, status, "mutex_unlock"); 5059 // Paranoia to ensure our locked and lock-free paths interact 5060 // correctly with each other. 5061 OrderAccess::fence(); 5062 } 5063 } 5064 5065 int os::PlatformEvent::park(jlong millis) { 5066 // Transitions for _Event: 5067 // -1 => -1 : illegal 5068 // 1 => 0 : pass - return immediately 5069 // 0 => -1 : block; then set _Event to 0 before returning 5070 5071 guarantee(_nParked == 0, "invariant"); 5072 int v; 5073 for (;;) { 5074 v = _Event; 5075 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5076 } 5077 guarantee(v >= 0, "invariant"); 5078 if (v != 0) return OS_OK; 5079 5080 int ret = OS_TIMEOUT; 5081 timestruc_t abst; 5082 compute_abstime(&abst, millis); 5083 5084 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5085 int status = os::Solaris::mutex_lock(_mutex); 5086 assert_status(status == 0, status, "mutex_lock"); 5087 guarantee(_nParked == 0, "invariant"); 5088 ++_nParked; 5089 while (_Event < 0) { 5090 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 5091 assert_status(status == 0 || status == EINTR || 5092 status == ETIME || status == ETIMEDOUT, 5093 status, "cond_timedwait"); 5094 if (!FilterSpuriousWakeups) break; // previous semantics 5095 if (status == ETIME || status == ETIMEDOUT) break; 5096 // We consume and ignore EINTR and spurious wakeups. 5097 } 5098 --_nParked; 5099 if (_Event >= 0) ret = OS_OK; 5100 _Event = 0; 5101 status = os::Solaris::mutex_unlock(_mutex); 5102 assert_status(status == 0, status, "mutex_unlock"); 5103 // Paranoia to ensure our locked and lock-free paths interact 5104 // correctly with each other. 5105 OrderAccess::fence(); 5106 return ret; 5107 } 5108 5109 void os::PlatformEvent::unpark() { 5110 // Transitions for _Event: 5111 // 0 => 1 : just return 5112 // 1 => 1 : just return 5113 // -1 => either 0 or 1; must signal target thread 5114 // That is, we can safely transition _Event from -1 to either 5115 // 0 or 1. 5116 // See also: "Semaphores in Plan 9" by Mullender & Cox 5117 // 5118 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5119 // that it will take two back-to-back park() calls for the owning 5120 // thread to block. This has the benefit of forcing a spurious return 5121 // from the first park() call after an unpark() call which will help 5122 // shake out uses of park() and unpark() without condition variables. 5123 5124 if (Atomic::xchg(1, &_Event) >= 0) return; 5125 5126 // If the thread associated with the event was parked, wake it. 5127 // Wait for the thread assoc with the PlatformEvent to vacate. 5128 int status = os::Solaris::mutex_lock(_mutex); 5129 assert_status(status == 0, status, "mutex_lock"); 5130 int AnyWaiters = _nParked; 5131 status = os::Solaris::mutex_unlock(_mutex); 5132 assert_status(status == 0, status, "mutex_unlock"); 5133 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 5134 if (AnyWaiters != 0) { 5135 // Note that we signal() *after* dropping the lock for "immortal" Events. 5136 // This is safe and avoids a common class of futile wakeups. In rare 5137 // circumstances this can cause a thread to return prematurely from 5138 // cond_{timed}wait() but the spurious wakeup is benign and the victim 5139 // will simply re-test the condition and re-park itself. 5140 // This provides particular benefit if the underlying platform does not 5141 // provide wait morphing. 5142 status = os::Solaris::cond_signal(_cond); 5143 assert_status(status == 0, status, "cond_signal"); 5144 } 5145 } 5146 5147 // JSR166 5148 // ------------------------------------------------------- 5149 5150 // The solaris and linux implementations of park/unpark are fairly 5151 // conservative for now, but can be improved. They currently use a 5152 // mutex/condvar pair, plus _counter. 5153 // Park decrements _counter if > 0, else does a condvar wait. Unpark 5154 // sets count to 1 and signals condvar. Only one thread ever waits 5155 // on the condvar. Contention seen when trying to park implies that someone 5156 // is unparking you, so don't wait. And spurious returns are fine, so there 5157 // is no need to track notifications. 5158 5159 #define MAX_SECS 100000000 5160 5161 // This code is common to linux and solaris and will be moved to a 5162 // common place in dolphin. 5163 // 5164 // The passed in time value is either a relative time in nanoseconds 5165 // or an absolute time in milliseconds. Either way it has to be unpacked 5166 // into suitable seconds and nanoseconds components and stored in the 5167 // given timespec structure. 5168 // Given time is a 64-bit value and the time_t used in the timespec is only 5169 // a signed-32-bit value (except on 64-bit Linux) we have to watch for 5170 // overflow if times way in the future are given. Further on Solaris versions 5171 // prior to 10 there is a restriction (see cond_timedwait) that the specified 5172 // number of seconds, in abstime, is less than current_time + 100,000,000. 5173 // As it will be 28 years before "now + 100000000" will overflow we can 5174 // ignore overflow and just impose a hard-limit on seconds using the value 5175 // of "now + 100,000,000". This places a limit on the timeout of about 3.17 5176 // years from "now". 5177 // 5178 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 5179 assert(time > 0, "convertTime"); 5180 5181 struct timeval now; 5182 int status = gettimeofday(&now, NULL); 5183 assert(status == 0, "gettimeofday"); 5184 5185 time_t max_secs = now.tv_sec + MAX_SECS; 5186 5187 if (isAbsolute) { 5188 jlong secs = time / 1000; 5189 if (secs > max_secs) { 5190 absTime->tv_sec = max_secs; 5191 } else { 5192 absTime->tv_sec = secs; 5193 } 5194 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 5195 } else { 5196 jlong secs = time / NANOSECS_PER_SEC; 5197 if (secs >= MAX_SECS) { 5198 absTime->tv_sec = max_secs; 5199 absTime->tv_nsec = 0; 5200 } else { 5201 absTime->tv_sec = now.tv_sec + secs; 5202 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 5203 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 5204 absTime->tv_nsec -= NANOSECS_PER_SEC; 5205 ++absTime->tv_sec; // note: this must be <= max_secs 5206 } 5207 } 5208 } 5209 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 5210 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 5211 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 5212 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 5213 } 5214 5215 void Parker::park(bool isAbsolute, jlong time) { 5216 // Ideally we'd do something useful while spinning, such 5217 // as calling unpackTime(). 5218 5219 // Optional fast-path check: 5220 // Return immediately if a permit is available. 5221 // We depend on Atomic::xchg() having full barrier semantics 5222 // since we are doing a lock-free update to _counter. 5223 if (Atomic::xchg(0, &_counter) > 0) return; 5224 5225 // Optional fast-exit: Check interrupt before trying to wait 5226 Thread* thread = Thread::current(); 5227 assert(thread->is_Java_thread(), "Must be JavaThread"); 5228 JavaThread *jt = (JavaThread *)thread; 5229 if (Thread::is_interrupted(thread, false)) { 5230 return; 5231 } 5232 5233 // First, demultiplex/decode time arguments 5234 timespec absTime; 5235 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all 5236 return; 5237 } 5238 if (time > 0) { 5239 // Warning: this code might be exposed to the old Solaris time 5240 // round-down bugs. Grep "roundingFix" for details. 5241 unpackTime(&absTime, isAbsolute, time); 5242 } 5243 5244 // Enter safepoint region 5245 // Beware of deadlocks such as 6317397. 5246 // The per-thread Parker:: _mutex is a classic leaf-lock. 5247 // In particular a thread must never block on the Threads_lock while 5248 // holding the Parker:: mutex. If safepoints are pending both the 5249 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 5250 ThreadBlockInVM tbivm(jt); 5251 5252 // Don't wait if cannot get lock since interference arises from 5253 // unblocking. Also. check interrupt before trying wait 5254 if (Thread::is_interrupted(thread, false) || 5255 os::Solaris::mutex_trylock(_mutex) != 0) { 5256 return; 5257 } 5258 5259 int status; 5260 5261 if (_counter > 0) { // no wait needed 5262 _counter = 0; 5263 status = os::Solaris::mutex_unlock(_mutex); 5264 assert(status == 0, "invariant"); 5265 // Paranoia to ensure our locked and lock-free paths interact 5266 // correctly with each other and Java-level accesses. 5267 OrderAccess::fence(); 5268 return; 5269 } 5270 5271 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5272 jt->set_suspend_equivalent(); 5273 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 5274 5275 // Do this the hard way by blocking ... 5276 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5277 if (time == 0) { 5278 status = os::Solaris::cond_wait(_cond, _mutex); 5279 } else { 5280 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 5281 } 5282 // Note that an untimed cond_wait() can sometimes return ETIME on older 5283 // versions of the Solaris. 5284 assert_status(status == 0 || status == EINTR || 5285 status == ETIME || status == ETIMEDOUT, 5286 status, "cond_timedwait"); 5287 5288 _counter = 0; 5289 status = os::Solaris::mutex_unlock(_mutex); 5290 assert_status(status == 0, status, "mutex_unlock"); 5291 // Paranoia to ensure our locked and lock-free paths interact 5292 // correctly with each other and Java-level accesses. 5293 OrderAccess::fence(); 5294 5295 // If externally suspended while waiting, re-suspend 5296 if (jt->handle_special_suspend_equivalent_condition()) { 5297 jt->java_suspend_self(); 5298 } 5299 } 5300 5301 void Parker::unpark() { 5302 int status = os::Solaris::mutex_lock(_mutex); 5303 assert(status == 0, "invariant"); 5304 const int s = _counter; 5305 _counter = 1; 5306 status = os::Solaris::mutex_unlock(_mutex); 5307 assert(status == 0, "invariant"); 5308 5309 if (s < 1) { 5310 status = os::Solaris::cond_signal(_cond); 5311 assert(status == 0, "invariant"); 5312 } 5313 } 5314 5315 extern char** environ; 5316 5317 // Run the specified command in a separate process. Return its exit value, 5318 // or -1 on failure (e.g. can't fork a new process). 5319 // Unlike system(), this function can be called from signal handler. It 5320 // doesn't block SIGINT et al. 5321 int os::fork_and_exec(char* cmd) { 5322 char * argv[4]; 5323 argv[0] = (char *)"sh"; 5324 argv[1] = (char *)"-c"; 5325 argv[2] = cmd; 5326 argv[3] = NULL; 5327 5328 // fork is async-safe, fork1 is not so can't use in signal handler 5329 pid_t pid; 5330 Thread* t = Thread::current_or_null_safe(); 5331 if (t != NULL && t->is_inside_signal_handler()) { 5332 pid = fork(); 5333 } else { 5334 pid = fork1(); 5335 } 5336 5337 if (pid < 0) { 5338 // fork failed 5339 warning("fork failed: %s", os::strerror(errno)); 5340 return -1; 5341 5342 } else if (pid == 0) { 5343 // child process 5344 5345 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 5346 execve("/usr/bin/sh", argv, environ); 5347 5348 // execve failed 5349 _exit(-1); 5350 5351 } else { 5352 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5353 // care about the actual exit code, for now. 5354 5355 int status; 5356 5357 // Wait for the child process to exit. This returns immediately if 5358 // the child has already exited. */ 5359 while (waitpid(pid, &status, 0) < 0) { 5360 switch (errno) { 5361 case ECHILD: return 0; 5362 case EINTR: break; 5363 default: return -1; 5364 } 5365 } 5366 5367 if (WIFEXITED(status)) { 5368 // The child exited normally; get its exit code. 5369 return WEXITSTATUS(status); 5370 } else if (WIFSIGNALED(status)) { 5371 // The child exited because of a signal 5372 // The best value to return is 0x80 + signal number, 5373 // because that is what all Unix shells do, and because 5374 // it allows callers to distinguish between process exit and 5375 // process death by signal. 5376 return 0x80 + WTERMSIG(status); 5377 } else { 5378 // Unknown exit code; pass it through 5379 return status; 5380 } 5381 } 5382 } 5383 5384 // is_headless_jre() 5385 // 5386 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 5387 // in order to report if we are running in a headless jre 5388 // 5389 // Since JDK8 xawt/libmawt.so was moved into the same directory 5390 // as libawt.so, and renamed libawt_xawt.so 5391 // 5392 bool os::is_headless_jre() { 5393 struct stat statbuf; 5394 char buf[MAXPATHLEN]; 5395 char libmawtpath[MAXPATHLEN]; 5396 const char *xawtstr = "/xawt/libmawt.so"; 5397 const char *new_xawtstr = "/libawt_xawt.so"; 5398 char *p; 5399 5400 // Get path to libjvm.so 5401 os::jvm_path(buf, sizeof(buf)); 5402 5403 // Get rid of libjvm.so 5404 p = strrchr(buf, '/'); 5405 if (p == NULL) { 5406 return false; 5407 } else { 5408 *p = '\0'; 5409 } 5410 5411 // Get rid of client or server 5412 p = strrchr(buf, '/'); 5413 if (p == NULL) { 5414 return false; 5415 } else { 5416 *p = '\0'; 5417 } 5418 5419 // check xawt/libmawt.so 5420 strcpy(libmawtpath, buf); 5421 strcat(libmawtpath, xawtstr); 5422 if (::stat(libmawtpath, &statbuf) == 0) return false; 5423 5424 // check libawt_xawt.so 5425 strcpy(libmawtpath, buf); 5426 strcat(libmawtpath, new_xawtstr); 5427 if (::stat(libmawtpath, &statbuf) == 0) return false; 5428 5429 return true; 5430 } 5431 5432 size_t os::write(int fd, const void *buf, unsigned int nBytes) { 5433 size_t res; 5434 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res); 5435 return res; 5436 } 5437 5438 int os::close(int fd) { 5439 return ::close(fd); 5440 } 5441 5442 int os::socket_close(int fd) { 5443 return ::close(fd); 5444 } 5445 5446 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5447 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5448 "Assumed _thread_in_native"); 5449 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags)); 5450 } 5451 5452 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5453 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5454 "Assumed _thread_in_native"); 5455 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5456 } 5457 5458 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5459 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5460 } 5461 5462 // As both poll and select can be interrupted by signals, we have to be 5463 // prepared to restart the system call after updating the timeout, unless 5464 // a poll() is done with timeout == -1, in which case we repeat with this 5465 // "wait forever" value. 5466 5467 int os::connect(int fd, struct sockaddr *him, socklen_t len) { 5468 int _result; 5469 _result = ::connect(fd, him, len); 5470 5471 // On Solaris, when a connect() call is interrupted, the connection 5472 // can be established asynchronously (see 6343810). Subsequent calls 5473 // to connect() must check the errno value which has the semantic 5474 // described below (copied from the connect() man page). Handling 5475 // of asynchronously established connections is required for both 5476 // blocking and non-blocking sockets. 5477 // EINTR The connection attempt was interrupted 5478 // before any data arrived by the delivery of 5479 // a signal. The connection, however, will be 5480 // established asynchronously. 5481 // 5482 // EINPROGRESS The socket is non-blocking, and the connec- 5483 // tion cannot be completed immediately. 5484 // 5485 // EALREADY The socket is non-blocking, and a previous 5486 // connection attempt has not yet been com- 5487 // pleted. 5488 // 5489 // EISCONN The socket is already connected. 5490 if (_result == OS_ERR && errno == EINTR) { 5491 // restarting a connect() changes its errno semantics 5492 RESTARTABLE(::connect(fd, him, len), _result); 5493 // undo these changes 5494 if (_result == OS_ERR) { 5495 if (errno == EALREADY) { 5496 errno = EINPROGRESS; // fall through 5497 } else if (errno == EISCONN) { 5498 errno = 0; 5499 return OS_OK; 5500 } 5501 } 5502 } 5503 return _result; 5504 } 5505 5506 // Get the default path to the core file 5507 // Returns the length of the string 5508 int os::get_core_path(char* buffer, size_t bufferSize) { 5509 const char* p = get_current_directory(buffer, bufferSize); 5510 5511 if (p == NULL) { 5512 assert(p != NULL, "failed to get current directory"); 5513 return 0; 5514 } 5515 5516 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 5517 p, current_process_id()); 5518 5519 return strlen(buffer); 5520 } 5521 5522 #ifndef PRODUCT 5523 void TestReserveMemorySpecial_test() { 5524 // No tests available for this platform 5525 } 5526 #endif 5527 5528 bool os::start_debugging(char *buf, int buflen) { 5529 int len = (int)strlen(buf); 5530 char *p = &buf[len]; 5531 5532 jio_snprintf(p, buflen-len, 5533 "\n\n" 5534 "Do you want to debug the problem?\n\n" 5535 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n" 5536 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 5537 "Otherwise, press RETURN to abort...", 5538 os::current_process_id(), os::current_thread_id()); 5539 5540 bool yes = os::message_box("Unexpected Error", buf); 5541 5542 if (yes) { 5543 // yes, user asked VM to launch debugger 5544 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id()); 5545 5546 os::fork_and_exec(buf); 5547 yes = false; 5548 } 5549 return yes; 5550 }