1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // no precompiled headers 26 #include "classfile/classLoader.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "classfile/vmSymbols.hpp" 29 #include "code/icBuffer.hpp" 30 #include "code/vtableStubs.hpp" 31 #include "compiler/compileBroker.hpp" 32 #include "compiler/disassembler.hpp" 33 #include "interpreter/interpreter.hpp" 34 #include "jvm_solaris.h" 35 #include "logging/log.hpp" 36 #include "memory/allocation.inline.hpp" 37 #include "memory/filemap.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "os_share_solaris.hpp" 40 #include "os_solaris.inline.hpp" 41 #include "prims/jniFastGetField.hpp" 42 #include "prims/jvm.h" 43 #include "prims/jvm_misc.hpp" 44 #include "runtime/arguments.hpp" 45 #include "runtime/atomic.hpp" 46 #include "runtime/extendedPC.hpp" 47 #include "runtime/globals.hpp" 48 #include "runtime/interfaceSupport.hpp" 49 #include "runtime/java.hpp" 50 #include "runtime/javaCalls.hpp" 51 #include "runtime/mutexLocker.hpp" 52 #include "runtime/objectMonitor.hpp" 53 #include "runtime/orderAccess.inline.hpp" 54 #include "runtime/osThread.hpp" 55 #include "runtime/perfMemory.hpp" 56 #include "runtime/sharedRuntime.hpp" 57 #include "runtime/statSampler.hpp" 58 #include "runtime/stubRoutines.hpp" 59 #include "runtime/thread.inline.hpp" 60 #include "runtime/threadCritical.hpp" 61 #include "runtime/timer.hpp" 62 #include "runtime/vm_version.hpp" 63 #include "semaphore_posix.hpp" 64 #include "services/attachListener.hpp" 65 #include "services/memTracker.hpp" 66 #include "services/runtimeService.hpp" 67 #include "utilities/align.hpp" 68 #include "utilities/decoder.hpp" 69 #include "utilities/defaultStream.hpp" 70 #include "utilities/events.hpp" 71 #include "utilities/growableArray.hpp" 72 #include "utilities/macros.hpp" 73 #include "utilities/vmError.hpp" 74 75 // put OS-includes here 76 # include <dlfcn.h> 77 # include <errno.h> 78 # include <exception> 79 # include <link.h> 80 # include <poll.h> 81 # include <pthread.h> 82 # include <schedctl.h> 83 # include <setjmp.h> 84 # include <signal.h> 85 # include <stdio.h> 86 # include <alloca.h> 87 # include <sys/filio.h> 88 # include <sys/ipc.h> 89 # include <sys/lwp.h> 90 # include <sys/machelf.h> // for elf Sym structure used by dladdr1 91 # include <sys/mman.h> 92 # include <sys/processor.h> 93 # include <sys/procset.h> 94 # include <sys/pset.h> 95 # include <sys/resource.h> 96 # include <sys/shm.h> 97 # include <sys/socket.h> 98 # include <sys/stat.h> 99 # include <sys/systeminfo.h> 100 # include <sys/time.h> 101 # include <sys/times.h> 102 # include <sys/types.h> 103 # include <sys/wait.h> 104 # include <sys/utsname.h> 105 # include <thread.h> 106 # include <unistd.h> 107 # include <sys/priocntl.h> 108 # include <sys/rtpriocntl.h> 109 # include <sys/tspriocntl.h> 110 # include <sys/iapriocntl.h> 111 # include <sys/fxpriocntl.h> 112 # include <sys/loadavg.h> 113 # include <string.h> 114 # include <stdio.h> 115 116 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 117 # include <sys/procfs.h> // see comment in <sys/procfs.h> 118 119 #define MAX_PATH (2 * K) 120 121 // for timer info max values which include all bits 122 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 123 124 125 // Here are some liblgrp types from sys/lgrp_user.h to be able to 126 // compile on older systems without this header file. 127 128 #ifndef MADV_ACCESS_LWP 129 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */ 130 #endif 131 #ifndef MADV_ACCESS_MANY 132 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */ 133 #endif 134 135 #ifndef LGRP_RSRC_CPU 136 #define LGRP_RSRC_CPU 0 /* CPU resources */ 137 #endif 138 #ifndef LGRP_RSRC_MEM 139 #define LGRP_RSRC_MEM 1 /* memory resources */ 140 #endif 141 142 // Values for ThreadPriorityPolicy == 1 143 int prio_policy1[CriticalPriority+1] = { 144 -99999, 0, 16, 32, 48, 64, 145 80, 96, 112, 124, 127, 127 }; 146 147 // System parameters used internally 148 static clock_t clock_tics_per_sec = 100; 149 150 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+) 151 static bool enabled_extended_FILE_stdio = false; 152 153 // For diagnostics to print a message once. see run_periodic_checks 154 static bool check_addr0_done = false; 155 static sigset_t check_signal_done; 156 static bool check_signals = true; 157 158 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo 159 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo 160 161 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround 162 163 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL; 164 165 // "default" initializers for missing libc APIs 166 extern "C" { 167 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 168 static int lwp_mutex_destroy(mutex_t *mx) { return 0; } 169 170 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 171 static int lwp_cond_destroy(cond_t *cv) { return 0; } 172 } 173 174 // "default" initializers for pthread-based synchronization 175 extern "C" { 176 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 177 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 178 } 179 180 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); 181 182 static inline size_t adjust_stack_size(address base, size_t size) { 183 if ((ssize_t)size < 0) { 184 // 4759953: Compensate for ridiculous stack size. 185 size = max_intx; 186 } 187 if (size > (size_t)base) { 188 // 4812466: Make sure size doesn't allow the stack to wrap the address space. 189 size = (size_t)base; 190 } 191 return size; 192 } 193 194 static inline stack_t get_stack_info() { 195 stack_t st; 196 int retval = thr_stksegment(&st); 197 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); 198 assert(retval == 0, "incorrect return value from thr_stksegment"); 199 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 200 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 201 return st; 202 } 203 204 address os::current_stack_base() { 205 int r = thr_main(); 206 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 207 bool is_primordial_thread = r; 208 209 // Workaround 4352906, avoid calls to thr_stksegment by 210 // thr_main after the first one (it looks like we trash 211 // some data, causing the value for ss_sp to be incorrect). 212 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) { 213 stack_t st = get_stack_info(); 214 if (is_primordial_thread) { 215 // cache initial value of stack base 216 os::Solaris::_main_stack_base = (address)st.ss_sp; 217 } 218 return (address)st.ss_sp; 219 } else { 220 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); 221 return os::Solaris::_main_stack_base; 222 } 223 } 224 225 size_t os::current_stack_size() { 226 size_t size; 227 228 int r = thr_main(); 229 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 230 if (!r) { 231 size = get_stack_info().ss_size; 232 } else { 233 struct rlimit limits; 234 getrlimit(RLIMIT_STACK, &limits); 235 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); 236 } 237 // base may not be page aligned 238 address base = current_stack_base(); 239 address bottom = align_up(base - size, os::vm_page_size());; 240 return (size_t)(base - bottom); 241 } 242 243 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 244 return localtime_r(clock, res); 245 } 246 247 void os::Solaris::try_enable_extended_io() { 248 typedef int (*enable_extended_FILE_stdio_t)(int, int); 249 250 if (!UseExtendedFileIO) { 251 return; 252 } 253 254 enable_extended_FILE_stdio_t enabler = 255 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT, 256 "enable_extended_FILE_stdio"); 257 if (enabler) { 258 enabler(-1, -1); 259 } 260 } 261 262 static int _processors_online = 0; 263 264 jint os::Solaris::_os_thread_limit = 0; 265 volatile jint os::Solaris::_os_thread_count = 0; 266 267 julong os::available_memory() { 268 return Solaris::available_memory(); 269 } 270 271 julong os::Solaris::available_memory() { 272 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); 273 } 274 275 julong os::Solaris::_physical_memory = 0; 276 277 julong os::physical_memory() { 278 return Solaris::physical_memory(); 279 } 280 281 static hrtime_t first_hrtime = 0; 282 static const hrtime_t hrtime_hz = 1000*1000*1000; 283 static volatile hrtime_t max_hrtime = 0; 284 285 286 void os::Solaris::initialize_system_info() { 287 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); 288 _processors_online = sysconf(_SC_NPROCESSORS_ONLN); 289 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * 290 (julong)sysconf(_SC_PAGESIZE); 291 } 292 293 int os::active_processor_count() { 294 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 295 pid_t pid = getpid(); 296 psetid_t pset = PS_NONE; 297 // Are we running in a processor set or is there any processor set around? 298 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) { 299 uint_t pset_cpus; 300 // Query the number of cpus available to us. 301 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) { 302 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check"); 303 _processors_online = pset_cpus; 304 return pset_cpus; 305 } 306 } 307 // Otherwise return number of online cpus 308 return online_cpus; 309 } 310 311 static bool find_processors_in_pset(psetid_t pset, 312 processorid_t** id_array, 313 uint_t* id_length) { 314 bool result = false; 315 // Find the number of processors in the processor set. 316 if (pset_info(pset, NULL, id_length, NULL) == 0) { 317 // Make up an array to hold their ids. 318 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 319 // Fill in the array with their processor ids. 320 if (pset_info(pset, NULL, id_length, *id_array) == 0) { 321 result = true; 322 } 323 } 324 return result; 325 } 326 327 // Callers of find_processors_online() must tolerate imprecise results -- 328 // the system configuration can change asynchronously because of DR 329 // or explicit psradm operations. 330 // 331 // We also need to take care that the loop (below) terminates as the 332 // number of processors online can change between the _SC_NPROCESSORS_ONLN 333 // request and the loop that builds the list of processor ids. Unfortunately 334 // there's no reliable way to determine the maximum valid processor id, 335 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online 336 // man pages, which claim the processor id set is "sparse, but 337 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually 338 // exit the loop. 339 // 340 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's 341 // not available on S8.0. 342 343 static bool find_processors_online(processorid_t** id_array, 344 uint* id_length) { 345 const processorid_t MAX_PROCESSOR_ID = 100000; 346 // Find the number of processors online. 347 *id_length = sysconf(_SC_NPROCESSORS_ONLN); 348 // Make up an array to hold their ids. 349 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 350 // Processors need not be numbered consecutively. 351 long found = 0; 352 processorid_t next = 0; 353 while (found < *id_length && next < MAX_PROCESSOR_ID) { 354 processor_info_t info; 355 if (processor_info(next, &info) == 0) { 356 // NB, PI_NOINTR processors are effectively online ... 357 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) { 358 (*id_array)[found] = next; 359 found += 1; 360 } 361 } 362 next += 1; 363 } 364 if (found < *id_length) { 365 // The loop above didn't identify the expected number of processors. 366 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN) 367 // and re-running the loop, above, but there's no guarantee of progress 368 // if the system configuration is in flux. Instead, we just return what 369 // we've got. Note that in the worst case find_processors_online() could 370 // return an empty set. (As a fall-back in the case of the empty set we 371 // could just return the ID of the current processor). 372 *id_length = found; 373 } 374 375 return true; 376 } 377 378 static bool assign_distribution(processorid_t* id_array, 379 uint id_length, 380 uint* distribution, 381 uint distribution_length) { 382 // We assume we can assign processorid_t's to uint's. 383 assert(sizeof(processorid_t) == sizeof(uint), 384 "can't convert processorid_t to uint"); 385 // Quick check to see if we won't succeed. 386 if (id_length < distribution_length) { 387 return false; 388 } 389 // Assign processor ids to the distribution. 390 // Try to shuffle processors to distribute work across boards, 391 // assuming 4 processors per board. 392 const uint processors_per_board = ProcessDistributionStride; 393 // Find the maximum processor id. 394 processorid_t max_id = 0; 395 for (uint m = 0; m < id_length; m += 1) { 396 max_id = MAX2(max_id, id_array[m]); 397 } 398 // The next id, to limit loops. 399 const processorid_t limit_id = max_id + 1; 400 // Make up markers for available processors. 401 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal); 402 for (uint c = 0; c < limit_id; c += 1) { 403 available_id[c] = false; 404 } 405 for (uint a = 0; a < id_length; a += 1) { 406 available_id[id_array[a]] = true; 407 } 408 // Step by "boards", then by "slot", copying to "assigned". 409 // NEEDS_CLEANUP: The assignment of processors should be stateful, 410 // remembering which processors have been assigned by 411 // previous calls, etc., so as to distribute several 412 // independent calls of this method. What we'd like is 413 // It would be nice to have an API that let us ask 414 // how many processes are bound to a processor, 415 // but we don't have that, either. 416 // In the short term, "board" is static so that 417 // subsequent distributions don't all start at board 0. 418 static uint board = 0; 419 uint assigned = 0; 420 // Until we've found enough processors .... 421 while (assigned < distribution_length) { 422 // ... find the next available processor in the board. 423 for (uint slot = 0; slot < processors_per_board; slot += 1) { 424 uint try_id = board * processors_per_board + slot; 425 if ((try_id < limit_id) && (available_id[try_id] == true)) { 426 distribution[assigned] = try_id; 427 available_id[try_id] = false; 428 assigned += 1; 429 break; 430 } 431 } 432 board += 1; 433 if (board * processors_per_board + 0 >= limit_id) { 434 board = 0; 435 } 436 } 437 if (available_id != NULL) { 438 FREE_C_HEAP_ARRAY(bool, available_id); 439 } 440 return true; 441 } 442 443 void os::set_native_thread_name(const char *name) { 444 if (Solaris::_pthread_setname_np != NULL) { 445 // Only the first 31 bytes of 'name' are processed by pthread_setname_np 446 // but we explicitly copy into a size-limited buffer to avoid any 447 // possible overflow. 448 char buf[32]; 449 snprintf(buf, sizeof(buf), "%s", name); 450 buf[sizeof(buf) - 1] = '\0'; 451 Solaris::_pthread_setname_np(pthread_self(), buf); 452 } 453 } 454 455 bool os::distribute_processes(uint length, uint* distribution) { 456 bool result = false; 457 // Find the processor id's of all the available CPUs. 458 processorid_t* id_array = NULL; 459 uint id_length = 0; 460 // There are some races between querying information and using it, 461 // since processor sets can change dynamically. 462 psetid_t pset = PS_NONE; 463 // Are we running in a processor set? 464 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) { 465 result = find_processors_in_pset(pset, &id_array, &id_length); 466 } else { 467 result = find_processors_online(&id_array, &id_length); 468 } 469 if (result == true) { 470 if (id_length >= length) { 471 result = assign_distribution(id_array, id_length, distribution, length); 472 } else { 473 result = false; 474 } 475 } 476 if (id_array != NULL) { 477 FREE_C_HEAP_ARRAY(processorid_t, id_array); 478 } 479 return result; 480 } 481 482 bool os::bind_to_processor(uint processor_id) { 483 // We assume that a processorid_t can be stored in a uint. 484 assert(sizeof(uint) == sizeof(processorid_t), 485 "can't convert uint to processorid_t"); 486 int bind_result = 487 processor_bind(P_LWPID, // bind LWP. 488 P_MYID, // bind current LWP. 489 (processorid_t) processor_id, // id. 490 NULL); // don't return old binding. 491 return (bind_result == 0); 492 } 493 494 // Return true if user is running as root. 495 496 bool os::have_special_privileges() { 497 static bool init = false; 498 static bool privileges = false; 499 if (!init) { 500 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 501 init = true; 502 } 503 return privileges; 504 } 505 506 507 void os::init_system_properties_values() { 508 // The next steps are taken in the product version: 509 // 510 // Obtain the JAVA_HOME value from the location of libjvm.so. 511 // This library should be located at: 512 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 513 // 514 // If "/jre/lib/" appears at the right place in the path, then we 515 // assume libjvm.so is installed in a JDK and we use this path. 516 // 517 // Otherwise exit with message: "Could not create the Java virtual machine." 518 // 519 // The following extra steps are taken in the debugging version: 520 // 521 // If "/jre/lib/" does NOT appear at the right place in the path 522 // instead of exit check for $JAVA_HOME environment variable. 523 // 524 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 525 // then we append a fake suffix "hotspot/libjvm.so" to this path so 526 // it looks like libjvm.so is installed there 527 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 528 // 529 // Otherwise exit. 530 // 531 // Important note: if the location of libjvm.so changes this 532 // code needs to be changed accordingly. 533 534 // Base path of extensions installed on the system. 535 #define SYS_EXT_DIR "/usr/jdk/packages" 536 #define EXTENSIONS_DIR "/lib/ext" 537 538 // Buffer that fits several sprintfs. 539 // Note that the space for the colon and the trailing null are provided 540 // by the nulls included by the sizeof operator. 541 const size_t bufsize = 542 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends. 543 sizeof(SYS_EXT_DIR) + sizeof("/lib/"), // invariant ld_library_path 544 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir 545 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 546 547 // sysclasspath, java_home, dll_dir 548 { 549 char *pslash; 550 os::jvm_path(buf, bufsize); 551 552 // Found the full path to libjvm.so. 553 // Now cut the path to <java_home>/jre if we can. 554 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 555 pslash = strrchr(buf, '/'); 556 if (pslash != NULL) { 557 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 558 } 559 Arguments::set_dll_dir(buf); 560 561 if (pslash != NULL) { 562 pslash = strrchr(buf, '/'); 563 if (pslash != NULL) { 564 *pslash = '\0'; // Get rid of /lib. 565 } 566 } 567 Arguments::set_java_home(buf); 568 set_boot_path('/', ':'); 569 } 570 571 // Where to look for native libraries. 572 { 573 // Use dlinfo() to determine the correct java.library.path. 574 // 575 // If we're launched by the Java launcher, and the user 576 // does not set java.library.path explicitly on the commandline, 577 // the Java launcher sets LD_LIBRARY_PATH for us and unsets 578 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case 579 // dlinfo returns LD_LIBRARY_PATH + crle settings (including 580 // /usr/lib), which is exactly what we want. 581 // 582 // If the user does set java.library.path, it completely 583 // overwrites this setting, and always has. 584 // 585 // If we're not launched by the Java launcher, we may 586 // get here with any/all of the LD_LIBRARY_PATH[_32|64] 587 // settings. Again, dlinfo does exactly what we want. 588 589 Dl_serinfo info_sz, *info = &info_sz; 590 Dl_serpath *path; 591 char *library_path; 592 char *common_path = buf; 593 594 // Determine search path count and required buffer size. 595 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) { 596 FREE_C_HEAP_ARRAY(char, buf); 597 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror()); 598 } 599 600 // Allocate new buffer and initialize. 601 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal); 602 info->dls_size = info_sz.dls_size; 603 info->dls_cnt = info_sz.dls_cnt; 604 605 // Obtain search path information. 606 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) { 607 FREE_C_HEAP_ARRAY(char, buf); 608 FREE_C_HEAP_ARRAY(char, info); 609 vm_exit_during_initialization("dlinfo SERINFO request", dlerror()); 610 } 611 612 path = &info->dls_serpath[0]; 613 614 // Note: Due to a legacy implementation, most of the library path 615 // is set in the launcher. This was to accomodate linking restrictions 616 // on legacy Solaris implementations (which are no longer supported). 617 // Eventually, all the library path setting will be done here. 618 // 619 // However, to prevent the proliferation of improperly built native 620 // libraries, the new path component /usr/jdk/packages is added here. 621 622 // Construct the invariant part of ld_library_path. 623 sprintf(common_path, SYS_EXT_DIR "/lib"); 624 625 // Struct size is more than sufficient for the path components obtained 626 // through the dlinfo() call, so only add additional space for the path 627 // components explicitly added here. 628 size_t library_path_size = info->dls_size + strlen(common_path); 629 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal); 630 library_path[0] = '\0'; 631 632 // Construct the desired Java library path from the linker's library 633 // search path. 634 // 635 // For compatibility, it is optimal that we insert the additional path 636 // components specific to the Java VM after those components specified 637 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so 638 // infrastructure. 639 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it. 640 strcpy(library_path, common_path); 641 } else { 642 int inserted = 0; 643 int i; 644 for (i = 0; i < info->dls_cnt; i++, path++) { 645 uint_t flags = path->dls_flags & LA_SER_MASK; 646 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) { 647 strcat(library_path, common_path); 648 strcat(library_path, os::path_separator()); 649 inserted = 1; 650 } 651 strcat(library_path, path->dls_name); 652 strcat(library_path, os::path_separator()); 653 } 654 // Eliminate trailing path separator. 655 library_path[strlen(library_path)-1] = '\0'; 656 } 657 658 // happens before argument parsing - can't use a trace flag 659 // tty->print_raw("init_system_properties_values: native lib path: "); 660 // tty->print_raw_cr(library_path); 661 662 // Callee copies into its own buffer. 663 Arguments::set_library_path(library_path); 664 665 FREE_C_HEAP_ARRAY(char, library_path); 666 FREE_C_HEAP_ARRAY(char, info); 667 } 668 669 // Extensions directories. 670 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); 671 Arguments::set_ext_dirs(buf); 672 673 FREE_C_HEAP_ARRAY(char, buf); 674 675 #undef SYS_EXT_DIR 676 #undef EXTENSIONS_DIR 677 } 678 679 void os::breakpoint() { 680 BREAKPOINT; 681 } 682 683 bool os::obsolete_option(const JavaVMOption *option) { 684 if (!strncmp(option->optionString, "-Xt", 3)) { 685 return true; 686 } else if (!strncmp(option->optionString, "-Xtm", 4)) { 687 return true; 688 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) { 689 return true; 690 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) { 691 return true; 692 } 693 return false; 694 } 695 696 bool os::Solaris::valid_stack_address(Thread* thread, address sp) { 697 address stackStart = (address)thread->stack_base(); 698 address stackEnd = (address)(stackStart - (address)thread->stack_size()); 699 if (sp < stackStart && sp >= stackEnd) return true; 700 return false; 701 } 702 703 extern "C" void breakpoint() { 704 // use debugger to set breakpoint here 705 } 706 707 static thread_t main_thread; 708 709 // Thread start routine for all newly created threads 710 extern "C" void* thread_native_entry(void* thread_addr) { 711 // Try to randomize the cache line index of hot stack frames. 712 // This helps when threads of the same stack traces evict each other's 713 // cache lines. The threads can be either from the same JVM instance, or 714 // from different JVM instances. The benefit is especially true for 715 // processors with hyperthreading technology. 716 static int counter = 0; 717 int pid = os::current_process_id(); 718 alloca(((pid ^ counter++) & 7) * 128); 719 720 int prio; 721 Thread* thread = (Thread*)thread_addr; 722 723 thread->initialize_thread_current(); 724 725 OSThread* osthr = thread->osthread(); 726 727 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound 728 thread->_schedctl = (void *) schedctl_init(); 729 730 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", 731 os::current_thread_id()); 732 733 if (UseNUMA) { 734 int lgrp_id = os::numa_get_group_id(); 735 if (lgrp_id != -1) { 736 thread->set_lgrp_id(lgrp_id); 737 } 738 } 739 740 // Our priority was set when we were created, and stored in the 741 // osthread, but couldn't be passed through to our LWP until now. 742 // So read back the priority and set it again. 743 744 if (osthr->thread_id() != -1) { 745 if (UseThreadPriorities) { 746 int prio = osthr->native_priority(); 747 if (ThreadPriorityVerbose) { 748 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " 749 INTPTR_FORMAT ", setting priority: %d\n", 750 osthr->thread_id(), osthr->lwp_id(), prio); 751 } 752 os::set_native_priority(thread, prio); 753 } 754 } else if (ThreadPriorityVerbose) { 755 warning("Can't set priority in _start routine, thread id hasn't been set\n"); 756 } 757 758 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 759 760 // initialize signal mask for this thread 761 os::Solaris::hotspot_sigmask(thread); 762 763 thread->run(); 764 765 // One less thread is executing 766 // When the VMThread gets here, the main thread may have already exited 767 // which frees the CodeHeap containing the Atomic::dec code 768 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 769 Atomic::dec(&os::Solaris::_os_thread_count); 770 } 771 772 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id()); 773 774 // If a thread has not deleted itself ("delete this") as part of its 775 // termination sequence, we have to ensure thread-local-storage is 776 // cleared before we actually terminate. No threads should ever be 777 // deleted asynchronously with respect to their termination. 778 if (Thread::current_or_null_safe() != NULL) { 779 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 780 thread->clear_thread_current(); 781 } 782 783 if (UseDetachedThreads) { 784 thr_exit(NULL); 785 ShouldNotReachHere(); 786 } 787 return NULL; 788 } 789 790 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) { 791 // Allocate the OSThread object 792 OSThread* osthread = new OSThread(NULL, NULL); 793 if (osthread == NULL) return NULL; 794 795 // Store info on the Solaris thread into the OSThread 796 osthread->set_thread_id(thread_id); 797 osthread->set_lwp_id(_lwp_self()); 798 thread->_schedctl = (void *) schedctl_init(); 799 800 if (UseNUMA) { 801 int lgrp_id = os::numa_get_group_id(); 802 if (lgrp_id != -1) { 803 thread->set_lgrp_id(lgrp_id); 804 } 805 } 806 807 if (ThreadPriorityVerbose) { 808 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n", 809 osthread->thread_id(), osthread->lwp_id()); 810 } 811 812 // Initial thread state is INITIALIZED, not SUSPENDED 813 osthread->set_state(INITIALIZED); 814 815 return osthread; 816 } 817 818 void os::Solaris::hotspot_sigmask(Thread* thread) { 819 //Save caller's signal mask 820 sigset_t sigmask; 821 pthread_sigmask(SIG_SETMASK, NULL, &sigmask); 822 OSThread *osthread = thread->osthread(); 823 osthread->set_caller_sigmask(sigmask); 824 825 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL); 826 if (!ReduceSignalUsage) { 827 if (thread->is_VM_thread()) { 828 // Only the VM thread handles BREAK_SIGNAL ... 829 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 830 } else { 831 // ... all other threads block BREAK_SIGNAL 832 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked"); 833 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 834 } 835 } 836 } 837 838 bool os::create_attached_thread(JavaThread* thread) { 839 #ifdef ASSERT 840 thread->verify_not_published(); 841 #endif 842 OSThread* osthread = create_os_thread(thread, thr_self()); 843 if (osthread == NULL) { 844 return false; 845 } 846 847 // Initial thread state is RUNNABLE 848 osthread->set_state(RUNNABLE); 849 thread->set_osthread(osthread); 850 851 // initialize signal mask for this thread 852 // and save the caller's signal mask 853 os::Solaris::hotspot_sigmask(thread); 854 855 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").", 856 os::current_thread_id()); 857 858 return true; 859 } 860 861 bool os::create_main_thread(JavaThread* thread) { 862 #ifdef ASSERT 863 thread->verify_not_published(); 864 #endif 865 if (_starting_thread == NULL) { 866 _starting_thread = create_os_thread(thread, main_thread); 867 if (_starting_thread == NULL) { 868 return false; 869 } 870 } 871 872 // The primodial thread is runnable from the start 873 _starting_thread->set_state(RUNNABLE); 874 875 thread->set_osthread(_starting_thread); 876 877 // initialize signal mask for this thread 878 // and save the caller's signal mask 879 os::Solaris::hotspot_sigmask(thread); 880 881 return true; 882 } 883 884 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr() 885 static char* describe_thr_create_attributes(char* buf, size_t buflen, 886 size_t stacksize, long flags) { 887 stringStream ss(buf, buflen); 888 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024); 889 ss.print("flags: "); 890 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " "); 891 #define ALL(X) \ 892 X(THR_SUSPENDED) \ 893 X(THR_DETACHED) \ 894 X(THR_BOUND) \ 895 X(THR_NEW_LWP) \ 896 X(THR_DAEMON) 897 ALL(PRINT_FLAG) 898 #undef ALL 899 #undef PRINT_FLAG 900 return buf; 901 } 902 903 // return default stack size for thr_type 904 size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 905 // default stack size when not specified by caller is 1M (2M for LP64) 906 size_t s = (BytesPerWord >> 2) * K * K; 907 return s; 908 } 909 910 bool os::create_thread(Thread* thread, ThreadType thr_type, 911 size_t req_stack_size) { 912 // Allocate the OSThread object 913 OSThread* osthread = new OSThread(NULL, NULL); 914 if (osthread == NULL) { 915 return false; 916 } 917 918 if (ThreadPriorityVerbose) { 919 char *thrtyp; 920 switch (thr_type) { 921 case vm_thread: 922 thrtyp = (char *)"vm"; 923 break; 924 case cgc_thread: 925 thrtyp = (char *)"cgc"; 926 break; 927 case pgc_thread: 928 thrtyp = (char *)"pgc"; 929 break; 930 case java_thread: 931 thrtyp = (char *)"java"; 932 break; 933 case compiler_thread: 934 thrtyp = (char *)"compiler"; 935 break; 936 case watcher_thread: 937 thrtyp = (char *)"watcher"; 938 break; 939 default: 940 thrtyp = (char *)"unknown"; 941 break; 942 } 943 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp); 944 } 945 946 // calculate stack size if it's not specified by caller 947 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 948 949 // Initial state is ALLOCATED but not INITIALIZED 950 osthread->set_state(ALLOCATED); 951 952 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) { 953 // We got lots of threads. Check if we still have some address space left. 954 // Need to be at least 5Mb of unreserved address space. We do check by 955 // trying to reserve some. 956 const size_t VirtualMemoryBangSize = 20*K*K; 957 char* mem = os::reserve_memory(VirtualMemoryBangSize); 958 if (mem == NULL) { 959 delete osthread; 960 return false; 961 } else { 962 // Release the memory again 963 os::release_memory(mem, VirtualMemoryBangSize); 964 } 965 } 966 967 // Setup osthread because the child thread may need it. 968 thread->set_osthread(osthread); 969 970 // Create the Solaris thread 971 thread_t tid = 0; 972 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED; 973 int status; 974 975 // Mark that we don't have an lwp or thread id yet. 976 // In case we attempt to set the priority before the thread starts. 977 osthread->set_lwp_id(-1); 978 osthread->set_thread_id(-1); 979 980 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid); 981 982 char buf[64]; 983 if (status == 0) { 984 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ", 985 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 986 } else { 987 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.", 988 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 989 } 990 991 if (status != 0) { 992 thread->set_osthread(NULL); 993 // Need to clean up stuff we've allocated so far 994 delete osthread; 995 return false; 996 } 997 998 Atomic::inc(&os::Solaris::_os_thread_count); 999 1000 // Store info on the Solaris thread into the OSThread 1001 osthread->set_thread_id(tid); 1002 1003 // Remember that we created this thread so we can set priority on it 1004 osthread->set_vm_created(); 1005 1006 // Most thread types will set an explicit priority before starting the thread, 1007 // but for those that don't we need a valid value to read back in thread_native_entry. 1008 osthread->set_native_priority(NormPriority); 1009 1010 // Initial thread state is INITIALIZED, not SUSPENDED 1011 osthread->set_state(INITIALIZED); 1012 1013 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 1014 return true; 1015 } 1016 1017 debug_only(static bool signal_sets_initialized = false); 1018 static sigset_t unblocked_sigs, vm_sigs; 1019 1020 bool os::Solaris::is_sig_ignored(int sig) { 1021 struct sigaction oact; 1022 sigaction(sig, (struct sigaction*)NULL, &oact); 1023 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 1024 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 1025 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) { 1026 return true; 1027 } else { 1028 return false; 1029 } 1030 } 1031 1032 void os::Solaris::signal_sets_init() { 1033 // Should also have an assertion stating we are still single-threaded. 1034 assert(!signal_sets_initialized, "Already initialized"); 1035 // Fill in signals that are necessarily unblocked for all threads in 1036 // the VM. Currently, we unblock the following signals: 1037 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 1038 // by -Xrs (=ReduceSignalUsage)); 1039 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 1040 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 1041 // the dispositions or masks wrt these signals. 1042 // Programs embedding the VM that want to use the above signals for their 1043 // own purposes must, at this time, use the "-Xrs" option to prevent 1044 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 1045 // (See bug 4345157, and other related bugs). 1046 // In reality, though, unblocking these signals is really a nop, since 1047 // these signals are not blocked by default. 1048 sigemptyset(&unblocked_sigs); 1049 sigaddset(&unblocked_sigs, SIGILL); 1050 sigaddset(&unblocked_sigs, SIGSEGV); 1051 sigaddset(&unblocked_sigs, SIGBUS); 1052 sigaddset(&unblocked_sigs, SIGFPE); 1053 sigaddset(&unblocked_sigs, ASYNC_SIGNAL); 1054 1055 if (!ReduceSignalUsage) { 1056 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 1057 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 1058 } 1059 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 1060 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 1061 } 1062 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 1063 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 1064 } 1065 } 1066 // Fill in signals that are blocked by all but the VM thread. 1067 sigemptyset(&vm_sigs); 1068 if (!ReduceSignalUsage) { 1069 sigaddset(&vm_sigs, BREAK_SIGNAL); 1070 } 1071 debug_only(signal_sets_initialized = true); 1072 1073 // For diagnostics only used in run_periodic_checks 1074 sigemptyset(&check_signal_done); 1075 } 1076 1077 // These are signals that are unblocked while a thread is running Java. 1078 // (For some reason, they get blocked by default.) 1079 sigset_t* os::Solaris::unblocked_signals() { 1080 assert(signal_sets_initialized, "Not initialized"); 1081 return &unblocked_sigs; 1082 } 1083 1084 // These are the signals that are blocked while a (non-VM) thread is 1085 // running Java. Only the VM thread handles these signals. 1086 sigset_t* os::Solaris::vm_signals() { 1087 assert(signal_sets_initialized, "Not initialized"); 1088 return &vm_sigs; 1089 } 1090 1091 void _handle_uncaught_cxx_exception() { 1092 VMError::report_and_die("An uncaught C++ exception"); 1093 } 1094 1095 1096 // First crack at OS-specific initialization, from inside the new thread. 1097 void os::initialize_thread(Thread* thr) { 1098 int r = thr_main(); 1099 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 1100 if (r) { 1101 JavaThread* jt = (JavaThread *)thr; 1102 assert(jt != NULL, "Sanity check"); 1103 size_t stack_size; 1104 address base = jt->stack_base(); 1105 if (Arguments::created_by_java_launcher()) { 1106 // Use 2MB to allow for Solaris 7 64 bit mode. 1107 stack_size = JavaThread::stack_size_at_create() == 0 1108 ? 2048*K : JavaThread::stack_size_at_create(); 1109 1110 // There are rare cases when we may have already used more than 1111 // the basic stack size allotment before this method is invoked. 1112 // Attempt to allow for a normally sized java_stack. 1113 size_t current_stack_offset = (size_t)(base - (address)&stack_size); 1114 stack_size += ReservedSpace::page_align_size_down(current_stack_offset); 1115 } else { 1116 // 6269555: If we were not created by a Java launcher, i.e. if we are 1117 // running embedded in a native application, treat the primordial thread 1118 // as much like a native attached thread as possible. This means using 1119 // the current stack size from thr_stksegment(), unless it is too large 1120 // to reliably setup guard pages. A reasonable max size is 8MB. 1121 size_t current_size = current_stack_size(); 1122 // This should never happen, but just in case.... 1123 if (current_size == 0) current_size = 2 * K * K; 1124 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size; 1125 } 1126 address bottom = align_up(base - stack_size, os::vm_page_size());; 1127 stack_size = (size_t)(base - bottom); 1128 1129 assert(stack_size > 0, "Stack size calculation problem"); 1130 1131 if (stack_size > jt->stack_size()) { 1132 #ifndef PRODUCT 1133 struct rlimit limits; 1134 getrlimit(RLIMIT_STACK, &limits); 1135 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur); 1136 assert(size >= jt->stack_size(), "Stack size problem in main thread"); 1137 #endif 1138 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n" 1139 "(Stack sizes are rounded up to a multiple of the system page size.)\n" 1140 "See limit(1) to increase the stack size limit.", 1141 stack_size / K, jt->stack_size() / K); 1142 vm_exit(1); 1143 } 1144 assert(jt->stack_size() >= stack_size, 1145 "Attempt to map more stack than was allocated"); 1146 jt->set_stack_size(stack_size); 1147 } 1148 1149 // With the T2 libthread (T1 is no longer supported) threads are always bound 1150 // and we use stackbanging in all cases. 1151 1152 os::Solaris::init_thread_fpu_state(); 1153 std::set_terminate(_handle_uncaught_cxx_exception); 1154 } 1155 1156 1157 1158 // Free Solaris resources related to the OSThread 1159 void os::free_thread(OSThread* osthread) { 1160 assert(osthread != NULL, "os::free_thread but osthread not set"); 1161 1162 // We are told to free resources of the argument thread, 1163 // but we can only really operate on the current thread. 1164 assert(Thread::current()->osthread() == osthread, 1165 "os::free_thread but not current thread"); 1166 1167 // Restore caller's signal mask 1168 sigset_t sigmask = osthread->caller_sigmask(); 1169 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 1170 1171 delete osthread; 1172 } 1173 1174 void os::pd_start_thread(Thread* thread) { 1175 int status = thr_continue(thread->osthread()->thread_id()); 1176 assert_status(status == 0, status, "thr_continue failed"); 1177 } 1178 1179 1180 intx os::current_thread_id() { 1181 return (intx)thr_self(); 1182 } 1183 1184 static pid_t _initial_pid = 0; 1185 1186 int os::current_process_id() { 1187 return (int)(_initial_pid ? _initial_pid : getpid()); 1188 } 1189 1190 // gethrtime() should be monotonic according to the documentation, 1191 // but some virtualized platforms are known to break this guarantee. 1192 // getTimeNanos() must be guaranteed not to move backwards, so we 1193 // are forced to add a check here. 1194 inline hrtime_t getTimeNanos() { 1195 const hrtime_t now = gethrtime(); 1196 const hrtime_t prev = max_hrtime; 1197 if (now <= prev) { 1198 return prev; // same or retrograde time; 1199 } 1200 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev); 1201 assert(obsv >= prev, "invariant"); // Monotonicity 1202 // If the CAS succeeded then we're done and return "now". 1203 // If the CAS failed and the observed value "obsv" is >= now then 1204 // we should return "obsv". If the CAS failed and now > obsv > prv then 1205 // some other thread raced this thread and installed a new value, in which case 1206 // we could either (a) retry the entire operation, (b) retry trying to install now 1207 // or (c) just return obsv. We use (c). No loop is required although in some cases 1208 // we might discard a higher "now" value in deference to a slightly lower but freshly 1209 // installed obsv value. That's entirely benign -- it admits no new orderings compared 1210 // to (a) or (b) -- and greatly reduces coherence traffic. 1211 // We might also condition (c) on the magnitude of the delta between obsv and now. 1212 // Avoiding excessive CAS operations to hot RW locations is critical. 1213 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 1214 return (prev == obsv) ? now : obsv; 1215 } 1216 1217 // Time since start-up in seconds to a fine granularity. 1218 // Used by VMSelfDestructTimer and the MemProfiler. 1219 double os::elapsedTime() { 1220 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1221 } 1222 1223 jlong os::elapsed_counter() { 1224 return (jlong)(getTimeNanos() - first_hrtime); 1225 } 1226 1227 jlong os::elapsed_frequency() { 1228 return hrtime_hz; 1229 } 1230 1231 // Return the real, user, and system times in seconds from an 1232 // arbitrary fixed point in the past. 1233 bool os::getTimesSecs(double* process_real_time, 1234 double* process_user_time, 1235 double* process_system_time) { 1236 struct tms ticks; 1237 clock_t real_ticks = times(&ticks); 1238 1239 if (real_ticks == (clock_t) (-1)) { 1240 return false; 1241 } else { 1242 double ticks_per_second = (double) clock_tics_per_sec; 1243 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1244 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1245 // For consistency return the real time from getTimeNanos() 1246 // converted to seconds. 1247 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); 1248 1249 return true; 1250 } 1251 } 1252 1253 bool os::supports_vtime() { return true; } 1254 bool os::enable_vtime() { return false; } 1255 bool os::vtime_enabled() { return false; } 1256 1257 double os::elapsedVTime() { 1258 return (double)gethrvtime() / (double)hrtime_hz; 1259 } 1260 1261 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 1262 jlong os::javaTimeMillis() { 1263 timeval t; 1264 if (gettimeofday(&t, NULL) == -1) { 1265 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno)); 1266 } 1267 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; 1268 } 1269 1270 // Must return seconds+nanos since Jan 1 1970. This must use the same 1271 // time source as javaTimeMillis and can't use get_nsec_fromepoch as 1272 // we need better than 1ms accuracy 1273 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 1274 timeval t; 1275 if (gettimeofday(&t, NULL) == -1) { 1276 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno)); 1277 } 1278 seconds = jlong(t.tv_sec); 1279 nanos = jlong(t.tv_usec) * 1000; 1280 } 1281 1282 1283 jlong os::javaTimeNanos() { 1284 return (jlong)getTimeNanos(); 1285 } 1286 1287 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1288 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits 1289 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1290 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1291 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1292 } 1293 1294 char * os::local_time_string(char *buf, size_t buflen) { 1295 struct tm t; 1296 time_t long_time; 1297 time(&long_time); 1298 localtime_r(&long_time, &t); 1299 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1300 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1301 t.tm_hour, t.tm_min, t.tm_sec); 1302 return buf; 1303 } 1304 1305 // Note: os::shutdown() might be called very early during initialization, or 1306 // called from signal handler. Before adding something to os::shutdown(), make 1307 // sure it is async-safe and can handle partially initialized VM. 1308 void os::shutdown() { 1309 1310 // allow PerfMemory to attempt cleanup of any persistent resources 1311 perfMemory_exit(); 1312 1313 // needs to remove object in file system 1314 AttachListener::abort(); 1315 1316 // flush buffered output, finish log files 1317 ostream_abort(); 1318 1319 // Check for abort hook 1320 abort_hook_t abort_hook = Arguments::abort_hook(); 1321 if (abort_hook != NULL) { 1322 abort_hook(); 1323 } 1324 } 1325 1326 // Note: os::abort() might be called very early during initialization, or 1327 // called from signal handler. Before adding something to os::abort(), make 1328 // sure it is async-safe and can handle partially initialized VM. 1329 void os::abort(bool dump_core, void* siginfo, const void* context) { 1330 os::shutdown(); 1331 if (dump_core) { 1332 #ifndef PRODUCT 1333 fdStream out(defaultStream::output_fd()); 1334 out.print_raw("Current thread is "); 1335 char buf[16]; 1336 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1337 out.print_raw_cr(buf); 1338 out.print_raw_cr("Dumping core ..."); 1339 #endif 1340 ::abort(); // dump core (for debugging) 1341 } 1342 1343 ::exit(1); 1344 } 1345 1346 // Die immediately, no exit hook, no abort hook, no cleanup. 1347 void os::die() { 1348 ::abort(); // dump core (for debugging) 1349 } 1350 1351 // DLL functions 1352 1353 const char* os::dll_file_extension() { return ".so"; } 1354 1355 // This must be hard coded because it's the system's temporary 1356 // directory not the java application's temp directory, ala java.io.tmpdir. 1357 const char* os::get_temp_directory() { return "/tmp"; } 1358 1359 static bool file_exists(const char* filename) { 1360 struct stat statbuf; 1361 if (filename == NULL || strlen(filename) == 0) { 1362 return false; 1363 } 1364 return os::stat(filename, &statbuf) == 0; 1365 } 1366 1367 bool os::dll_build_name(char* buffer, size_t buflen, 1368 const char* pname, const char* fname) { 1369 bool retval = false; 1370 const size_t pnamelen = pname ? strlen(pname) : 0; 1371 1372 // Return error on buffer overflow. 1373 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { 1374 return retval; 1375 } 1376 1377 if (pnamelen == 0) { 1378 snprintf(buffer, buflen, "lib%s.so", fname); 1379 retval = true; 1380 } else if (strchr(pname, *os::path_separator()) != NULL) { 1381 int n; 1382 char** pelements = split_path(pname, &n); 1383 if (pelements == NULL) { 1384 return false; 1385 } 1386 for (int i = 0; i < n; i++) { 1387 // really shouldn't be NULL but what the heck, check can't hurt 1388 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1389 continue; // skip the empty path values 1390 } 1391 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); 1392 if (file_exists(buffer)) { 1393 retval = true; 1394 break; 1395 } 1396 } 1397 // release the storage 1398 for (int i = 0; i < n; i++) { 1399 if (pelements[i] != NULL) { 1400 FREE_C_HEAP_ARRAY(char, pelements[i]); 1401 } 1402 } 1403 if (pelements != NULL) { 1404 FREE_C_HEAP_ARRAY(char*, pelements); 1405 } 1406 } else { 1407 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); 1408 retval = true; 1409 } 1410 return retval; 1411 } 1412 1413 // check if addr is inside libjvm.so 1414 bool os::address_is_in_vm(address addr) { 1415 static address libjvm_base_addr; 1416 Dl_info dlinfo; 1417 1418 if (libjvm_base_addr == NULL) { 1419 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1420 libjvm_base_addr = (address)dlinfo.dli_fbase; 1421 } 1422 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1423 } 1424 1425 if (dladdr((void *)addr, &dlinfo) != 0) { 1426 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1427 } 1428 1429 return false; 1430 } 1431 1432 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int); 1433 static dladdr1_func_type dladdr1_func = NULL; 1434 1435 bool os::dll_address_to_function_name(address addr, char *buf, 1436 int buflen, int * offset, 1437 bool demangle) { 1438 // buf is not optional, but offset is optional 1439 assert(buf != NULL, "sanity check"); 1440 1441 Dl_info dlinfo; 1442 1443 // dladdr1_func was initialized in os::init() 1444 if (dladdr1_func != NULL) { 1445 // yes, we have dladdr1 1446 1447 // Support for dladdr1 is checked at runtime; it may be 1448 // available even if the vm is built on a machine that does 1449 // not have dladdr1 support. Make sure there is a value for 1450 // RTLD_DL_SYMENT. 1451 #ifndef RTLD_DL_SYMENT 1452 #define RTLD_DL_SYMENT 1 1453 #endif 1454 #ifdef _LP64 1455 Elf64_Sym * info; 1456 #else 1457 Elf32_Sym * info; 1458 #endif 1459 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1460 RTLD_DL_SYMENT) != 0) { 1461 // see if we have a matching symbol that covers our address 1462 if (dlinfo.dli_saddr != NULL && 1463 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) { 1464 if (dlinfo.dli_sname != NULL) { 1465 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1466 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1467 } 1468 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1469 return true; 1470 } 1471 } 1472 // no matching symbol so try for just file info 1473 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1474 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1475 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1476 return true; 1477 } 1478 } 1479 } 1480 buf[0] = '\0'; 1481 if (offset != NULL) *offset = -1; 1482 return false; 1483 } 1484 1485 // no, only dladdr is available 1486 if (dladdr((void *)addr, &dlinfo) != 0) { 1487 // see if we have a matching symbol 1488 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1489 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1490 jio_snprintf(buf, buflen, dlinfo.dli_sname); 1491 } 1492 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1493 return true; 1494 } 1495 // no matching symbol so try for just file info 1496 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1497 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1498 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1499 return true; 1500 } 1501 } 1502 } 1503 buf[0] = '\0'; 1504 if (offset != NULL) *offset = -1; 1505 return false; 1506 } 1507 1508 bool os::dll_address_to_library_name(address addr, char* buf, 1509 int buflen, int* offset) { 1510 // buf is not optional, but offset is optional 1511 assert(buf != NULL, "sanity check"); 1512 1513 Dl_info dlinfo; 1514 1515 if (dladdr((void*)addr, &dlinfo) != 0) { 1516 if (dlinfo.dli_fname != NULL) { 1517 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1518 } 1519 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1520 *offset = addr - (address)dlinfo.dli_fbase; 1521 } 1522 return true; 1523 } 1524 1525 buf[0] = '\0'; 1526 if (offset) *offset = -1; 1527 return false; 1528 } 1529 1530 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1531 Dl_info dli; 1532 // Sanity check? 1533 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 || 1534 dli.dli_fname == NULL) { 1535 return 1; 1536 } 1537 1538 void * handle = dlopen(dli.dli_fname, RTLD_LAZY); 1539 if (handle == NULL) { 1540 return 1; 1541 } 1542 1543 Link_map *map; 1544 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1545 if (map == NULL) { 1546 dlclose(handle); 1547 return 1; 1548 } 1549 1550 while (map->l_prev != NULL) { 1551 map = map->l_prev; 1552 } 1553 1554 while (map != NULL) { 1555 // Iterate through all map entries and call callback with fields of interest 1556 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1557 dlclose(handle); 1558 return 1; 1559 } 1560 map = map->l_next; 1561 } 1562 1563 dlclose(handle); 1564 return 0; 1565 } 1566 1567 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1568 outputStream * out = (outputStream *) param; 1569 out->print_cr(PTR_FORMAT " \t%s", base_address, name); 1570 return 0; 1571 } 1572 1573 void os::print_dll_info(outputStream * st) { 1574 st->print_cr("Dynamic libraries:"); st->flush(); 1575 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1576 st->print_cr("Error: Cannot print dynamic libraries."); 1577 } 1578 } 1579 1580 // Loads .dll/.so and 1581 // in case of error it checks if .dll/.so was built for the 1582 // same architecture as Hotspot is running on 1583 1584 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1585 void * result= ::dlopen(filename, RTLD_LAZY); 1586 if (result != NULL) { 1587 // Successful loading 1588 return result; 1589 } 1590 1591 Elf32_Ehdr elf_head; 1592 1593 // Read system error message into ebuf 1594 // It may or may not be overwritten below 1595 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1596 ebuf[ebuflen-1]='\0'; 1597 int diag_msg_max_length=ebuflen-strlen(ebuf); 1598 char* diag_msg_buf=ebuf+strlen(ebuf); 1599 1600 if (diag_msg_max_length==0) { 1601 // No more space in ebuf for additional diagnostics message 1602 return NULL; 1603 } 1604 1605 1606 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1607 1608 if (file_descriptor < 0) { 1609 // Can't open library, report dlerror() message 1610 return NULL; 1611 } 1612 1613 bool failed_to_read_elf_head= 1614 (sizeof(elf_head)!= 1615 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1616 1617 ::close(file_descriptor); 1618 if (failed_to_read_elf_head) { 1619 // file i/o error - report dlerror() msg 1620 return NULL; 1621 } 1622 1623 typedef struct { 1624 Elf32_Half code; // Actual value as defined in elf.h 1625 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1626 char elf_class; // 32 or 64 bit 1627 char endianess; // MSB or LSB 1628 char* name; // String representation 1629 } arch_t; 1630 1631 static const arch_t arch_array[]={ 1632 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1633 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1634 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1635 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1636 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1637 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1638 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1639 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1640 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1641 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"} 1642 }; 1643 1644 #if (defined IA32) 1645 static Elf32_Half running_arch_code=EM_386; 1646 #elif (defined AMD64) 1647 static Elf32_Half running_arch_code=EM_X86_64; 1648 #elif (defined IA64) 1649 static Elf32_Half running_arch_code=EM_IA_64; 1650 #elif (defined __sparc) && (defined _LP64) 1651 static Elf32_Half running_arch_code=EM_SPARCV9; 1652 #elif (defined __sparc) && (!defined _LP64) 1653 static Elf32_Half running_arch_code=EM_SPARC; 1654 #elif (defined __powerpc64__) 1655 static Elf32_Half running_arch_code=EM_PPC64; 1656 #elif (defined __powerpc__) 1657 static Elf32_Half running_arch_code=EM_PPC; 1658 #elif (defined ARM) 1659 static Elf32_Half running_arch_code=EM_ARM; 1660 #else 1661 #error Method os::dll_load requires that one of following is defined:\ 1662 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM 1663 #endif 1664 1665 // Identify compatability class for VM's architecture and library's architecture 1666 // Obtain string descriptions for architectures 1667 1668 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1669 int running_arch_index=-1; 1670 1671 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1672 if (running_arch_code == arch_array[i].code) { 1673 running_arch_index = i; 1674 } 1675 if (lib_arch.code == arch_array[i].code) { 1676 lib_arch.compat_class = arch_array[i].compat_class; 1677 lib_arch.name = arch_array[i].name; 1678 } 1679 } 1680 1681 assert(running_arch_index != -1, 1682 "Didn't find running architecture code (running_arch_code) in arch_array"); 1683 if (running_arch_index == -1) { 1684 // Even though running architecture detection failed 1685 // we may still continue with reporting dlerror() message 1686 return NULL; 1687 } 1688 1689 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1690 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1691 return NULL; 1692 } 1693 1694 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1695 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1696 return NULL; 1697 } 1698 1699 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1700 if (lib_arch.name!=NULL) { 1701 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1702 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1703 lib_arch.name, arch_array[running_arch_index].name); 1704 } else { 1705 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1706 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1707 lib_arch.code, 1708 arch_array[running_arch_index].name); 1709 } 1710 } 1711 1712 return NULL; 1713 } 1714 1715 void* os::dll_lookup(void* handle, const char* name) { 1716 return dlsym(handle, name); 1717 } 1718 1719 void* os::get_default_process_handle() { 1720 return (void*)::dlopen(NULL, RTLD_LAZY); 1721 } 1722 1723 int os::stat(const char *path, struct stat *sbuf) { 1724 char pathbuf[MAX_PATH]; 1725 if (strlen(path) > MAX_PATH - 1) { 1726 errno = ENAMETOOLONG; 1727 return -1; 1728 } 1729 os::native_path(strcpy(pathbuf, path)); 1730 return ::stat(pathbuf, sbuf); 1731 } 1732 1733 static inline time_t get_mtime(const char* filename) { 1734 struct stat st; 1735 int ret = os::stat(filename, &st); 1736 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 1737 return st.st_mtime; 1738 } 1739 1740 int os::compare_file_modified_times(const char* file1, const char* file2) { 1741 time_t t1 = get_mtime(file1); 1742 time_t t2 = get_mtime(file2); 1743 return t1 - t2; 1744 } 1745 1746 static bool _print_ascii_file(const char* filename, outputStream* st) { 1747 int fd = ::open(filename, O_RDONLY); 1748 if (fd == -1) { 1749 return false; 1750 } 1751 1752 char buf[32]; 1753 int bytes; 1754 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1755 st->print_raw(buf, bytes); 1756 } 1757 1758 ::close(fd); 1759 1760 return true; 1761 } 1762 1763 void os::print_os_info_brief(outputStream* st) { 1764 os::Solaris::print_distro_info(st); 1765 1766 os::Posix::print_uname_info(st); 1767 1768 os::Solaris::print_libversion_info(st); 1769 } 1770 1771 void os::print_os_info(outputStream* st) { 1772 st->print("OS:"); 1773 1774 os::Solaris::print_distro_info(st); 1775 1776 os::Posix::print_uname_info(st); 1777 1778 os::Solaris::print_libversion_info(st); 1779 1780 os::Posix::print_rlimit_info(st); 1781 1782 os::Posix::print_load_average(st); 1783 } 1784 1785 void os::Solaris::print_distro_info(outputStream* st) { 1786 if (!_print_ascii_file("/etc/release", st)) { 1787 st->print("Solaris"); 1788 } 1789 st->cr(); 1790 } 1791 1792 void os::get_summary_os_info(char* buf, size_t buflen) { 1793 strncpy(buf, "Solaris", buflen); // default to plain solaris 1794 FILE* fp = fopen("/etc/release", "r"); 1795 if (fp != NULL) { 1796 char tmp[256]; 1797 // Only get the first line and chop out everything but the os name. 1798 if (fgets(tmp, sizeof(tmp), fp)) { 1799 char* ptr = tmp; 1800 // skip past whitespace characters 1801 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++; 1802 if (*ptr != '\0') { 1803 char* nl = strchr(ptr, '\n'); 1804 if (nl != NULL) *nl = '\0'; 1805 strncpy(buf, ptr, buflen); 1806 } 1807 } 1808 fclose(fp); 1809 } 1810 } 1811 1812 void os::Solaris::print_libversion_info(outputStream* st) { 1813 st->print(" (T2 libthread)"); 1814 st->cr(); 1815 } 1816 1817 static bool check_addr0(outputStream* st) { 1818 jboolean status = false; 1819 const int read_chunk = 200; 1820 int ret = 0; 1821 int nmap = 0; 1822 int fd = ::open("/proc/self/map",O_RDONLY); 1823 if (fd >= 0) { 1824 prmap_t *p = NULL; 1825 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t)); 1826 if (NULL == mbuff) { 1827 ::close(fd); 1828 return status; 1829 } 1830 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) { 1831 //check if read() has not read partial data 1832 if( 0 != ret % sizeof(prmap_t)){ 1833 break; 1834 } 1835 nmap = ret / sizeof(prmap_t); 1836 p = (prmap_t *)mbuff; 1837 for(int i = 0; i < nmap; i++){ 1838 if (p->pr_vaddr == 0x0) { 1839 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024); 1840 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname); 1841 st->print("Access: "); 1842 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-"); 1843 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-"); 1844 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-"); 1845 st->cr(); 1846 status = true; 1847 } 1848 p++; 1849 } 1850 } 1851 free(mbuff); 1852 ::close(fd); 1853 } 1854 return status; 1855 } 1856 1857 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1858 // Get MHz with system call. We don't seem to already have this. 1859 processor_info_t stats; 1860 processorid_t id = getcpuid(); 1861 int clock = 0; 1862 if (processor_info(id, &stats) != -1) { 1863 clock = stats.pi_clock; // pi_processor_type isn't more informative than below 1864 } 1865 #ifdef AMD64 1866 snprintf(buf, buflen, "x86 64 bit %d MHz", clock); 1867 #else 1868 // must be sparc 1869 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock); 1870 #endif 1871 } 1872 1873 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1874 // Nothing to do for now. 1875 } 1876 1877 void os::print_memory_info(outputStream* st) { 1878 st->print("Memory:"); 1879 st->print(" %dk page", os::vm_page_size()>>10); 1880 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 1881 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 1882 st->cr(); 1883 (void) check_addr0(st); 1884 } 1885 1886 // Moved from whole group, because we need them here for diagnostic 1887 // prints. 1888 static int Maxsignum = 0; 1889 static int *ourSigFlags = NULL; 1890 1891 int os::Solaris::get_our_sigflags(int sig) { 1892 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1893 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1894 return ourSigFlags[sig]; 1895 } 1896 1897 void os::Solaris::set_our_sigflags(int sig, int flags) { 1898 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1899 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1900 ourSigFlags[sig] = flags; 1901 } 1902 1903 1904 static const char* get_signal_handler_name(address handler, 1905 char* buf, int buflen) { 1906 int offset; 1907 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 1908 if (found) { 1909 // skip directory names 1910 const char *p1, *p2; 1911 p1 = buf; 1912 size_t len = strlen(os::file_separator()); 1913 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 1914 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 1915 } else { 1916 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 1917 } 1918 return buf; 1919 } 1920 1921 static void print_signal_handler(outputStream* st, int sig, 1922 char* buf, size_t buflen) { 1923 struct sigaction sa; 1924 1925 sigaction(sig, NULL, &sa); 1926 1927 st->print("%s: ", os::exception_name(sig, buf, buflen)); 1928 1929 address handler = (sa.sa_flags & SA_SIGINFO) 1930 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 1931 : CAST_FROM_FN_PTR(address, sa.sa_handler); 1932 1933 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 1934 st->print("SIG_DFL"); 1935 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 1936 st->print("SIG_IGN"); 1937 } else { 1938 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 1939 } 1940 1941 st->print(", sa_mask[0]="); 1942 os::Posix::print_signal_set_short(st, &sa.sa_mask); 1943 1944 address rh = VMError::get_resetted_sighandler(sig); 1945 // May be, handler was resetted by VMError? 1946 if (rh != NULL) { 1947 handler = rh; 1948 sa.sa_flags = VMError::get_resetted_sigflags(sig); 1949 } 1950 1951 st->print(", sa_flags="); 1952 os::Posix::print_sa_flags(st, sa.sa_flags); 1953 1954 // Check: is it our handler? 1955 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) { 1956 // It is our signal handler 1957 // check for flags 1958 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 1959 st->print( 1960 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 1961 os::Solaris::get_our_sigflags(sig)); 1962 } 1963 } 1964 st->cr(); 1965 } 1966 1967 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1968 st->print_cr("Signal Handlers:"); 1969 print_signal_handler(st, SIGSEGV, buf, buflen); 1970 print_signal_handler(st, SIGBUS , buf, buflen); 1971 print_signal_handler(st, SIGFPE , buf, buflen); 1972 print_signal_handler(st, SIGPIPE, buf, buflen); 1973 print_signal_handler(st, SIGXFSZ, buf, buflen); 1974 print_signal_handler(st, SIGILL , buf, buflen); 1975 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 1976 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1977 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 1978 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1979 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 1980 } 1981 1982 static char saved_jvm_path[MAXPATHLEN] = { 0 }; 1983 1984 // Find the full path to the current module, libjvm.so 1985 void os::jvm_path(char *buf, jint buflen) { 1986 // Error checking. 1987 if (buflen < MAXPATHLEN) { 1988 assert(false, "must use a large-enough buffer"); 1989 buf[0] = '\0'; 1990 return; 1991 } 1992 // Lazy resolve the path to current module. 1993 if (saved_jvm_path[0] != 0) { 1994 strcpy(buf, saved_jvm_path); 1995 return; 1996 } 1997 1998 Dl_info dlinfo; 1999 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 2000 assert(ret != 0, "cannot locate libjvm"); 2001 if (ret != 0 && dlinfo.dli_fname != NULL) { 2002 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) { 2003 return; 2004 } 2005 } else { 2006 buf[0] = '\0'; 2007 return; 2008 } 2009 2010 if (Arguments::sun_java_launcher_is_altjvm()) { 2011 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 2012 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". 2013 // If "/jre/lib/" appears at the right place in the string, then 2014 // assume we are installed in a JDK and we're done. Otherwise, check 2015 // for a JAVA_HOME environment variable and fix up the path so it 2016 // looks like libjvm.so is installed there (append a fake suffix 2017 // hotspot/libjvm.so). 2018 const char *p = buf + strlen(buf) - 1; 2019 for (int count = 0; p > buf && count < 5; ++count) { 2020 for (--p; p > buf && *p != '/'; --p) 2021 /* empty */ ; 2022 } 2023 2024 if (strncmp(p, "/jre/lib/", 9) != 0) { 2025 // Look for JAVA_HOME in the environment. 2026 char* java_home_var = ::getenv("JAVA_HOME"); 2027 if (java_home_var != NULL && java_home_var[0] != 0) { 2028 char* jrelib_p; 2029 int len; 2030 2031 // Check the current module name "libjvm.so". 2032 p = strrchr(buf, '/'); 2033 assert(strstr(p, "/libjvm") == p, "invalid library name"); 2034 2035 if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) { 2036 return; 2037 } 2038 // determine if this is a legacy image or modules image 2039 // modules image doesn't have "jre" subdirectory 2040 len = strlen(buf); 2041 assert(len < buflen, "Ran out of buffer space"); 2042 jrelib_p = buf + len; 2043 snprintf(jrelib_p, buflen-len, "/jre/lib"); 2044 if (0 != access(buf, F_OK)) { 2045 snprintf(jrelib_p, buflen-len, "/lib"); 2046 } 2047 2048 if (0 == access(buf, F_OK)) { 2049 // Use current module name "libjvm.so" 2050 len = strlen(buf); 2051 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 2052 } else { 2053 // Go back to path of .so 2054 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) { 2055 return; 2056 } 2057 } 2058 } 2059 } 2060 } 2061 2062 strncpy(saved_jvm_path, buf, MAXPATHLEN); 2063 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 2064 } 2065 2066 2067 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2068 // no prefix required, not even "_" 2069 } 2070 2071 2072 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2073 // no suffix required 2074 } 2075 2076 // This method is a copy of JDK's sysGetLastErrorString 2077 // from src/solaris/hpi/src/system_md.c 2078 2079 size_t os::lasterror(char *buf, size_t len) { 2080 if (errno == 0) return 0; 2081 2082 const char *s = os::strerror(errno); 2083 size_t n = ::strlen(s); 2084 if (n >= len) { 2085 n = len - 1; 2086 } 2087 ::strncpy(buf, s, n); 2088 buf[n] = '\0'; 2089 return n; 2090 } 2091 2092 2093 // sun.misc.Signal 2094 2095 extern "C" { 2096 static void UserHandler(int sig, void *siginfo, void *context) { 2097 // Ctrl-C is pressed during error reporting, likely because the error 2098 // handler fails to abort. Let VM die immediately. 2099 if (sig == SIGINT && VMError::is_error_reported()) { 2100 os::die(); 2101 } 2102 2103 os::signal_notify(sig); 2104 // We do not need to reinstate the signal handler each time... 2105 } 2106 } 2107 2108 void* os::user_handler() { 2109 return CAST_FROM_FN_PTR(void*, UserHandler); 2110 } 2111 2112 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) { 2113 struct timespec ts; 2114 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 2115 2116 return ts; 2117 } 2118 2119 extern "C" { 2120 typedef void (*sa_handler_t)(int); 2121 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2122 } 2123 2124 void* os::signal(int signal_number, void* handler) { 2125 struct sigaction sigAct, oldSigAct; 2126 sigfillset(&(sigAct.sa_mask)); 2127 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 2128 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2129 2130 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 2131 // -1 means registration failed 2132 return (void *)-1; 2133 } 2134 2135 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2136 } 2137 2138 void os::signal_raise(int signal_number) { 2139 raise(signal_number); 2140 } 2141 2142 // The following code is moved from os.cpp for making this 2143 // code platform specific, which it is by its very nature. 2144 2145 // a counter for each possible signal value 2146 static int Sigexit = 0; 2147 static jint *pending_signals = NULL; 2148 static int *preinstalled_sigs = NULL; 2149 static struct sigaction *chainedsigactions = NULL; 2150 static sema_t sig_sem; 2151 typedef int (*version_getting_t)(); 2152 version_getting_t os::Solaris::get_libjsig_version = NULL; 2153 2154 int os::sigexitnum_pd() { 2155 assert(Sigexit > 0, "signal memory not yet initialized"); 2156 return Sigexit; 2157 } 2158 2159 void os::Solaris::init_signal_mem() { 2160 // Initialize signal structures 2161 Maxsignum = SIGRTMAX; 2162 Sigexit = Maxsignum+1; 2163 assert(Maxsignum >0, "Unable to obtain max signal number"); 2164 2165 // pending_signals has one int per signal 2166 // The additional signal is for SIGEXIT - exit signal to signal_thread 2167 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); 2168 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 2169 2170 if (UseSignalChaining) { 2171 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 2172 * (Maxsignum + 1), mtInternal); 2173 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 2174 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2175 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 2176 } 2177 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2178 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 2179 } 2180 2181 void os::signal_init_pd() { 2182 int ret; 2183 2184 ret = ::sema_init(&sig_sem, 0, NULL, NULL); 2185 assert(ret == 0, "sema_init() failed"); 2186 } 2187 2188 void os::signal_notify(int signal_number) { 2189 int ret; 2190 2191 Atomic::inc(&pending_signals[signal_number]); 2192 ret = ::sema_post(&sig_sem); 2193 assert(ret == 0, "sema_post() failed"); 2194 } 2195 2196 static int check_pending_signals(bool wait_for_signal) { 2197 int ret; 2198 while (true) { 2199 for (int i = 0; i < Sigexit + 1; i++) { 2200 jint n = pending_signals[i]; 2201 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2202 return i; 2203 } 2204 } 2205 if (!wait_for_signal) { 2206 return -1; 2207 } 2208 JavaThread *thread = JavaThread::current(); 2209 ThreadBlockInVM tbivm(thread); 2210 2211 bool threadIsSuspended; 2212 do { 2213 thread->set_suspend_equivalent(); 2214 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2215 while ((ret = ::sema_wait(&sig_sem)) == EINTR) 2216 ; 2217 assert(ret == 0, "sema_wait() failed"); 2218 2219 // were we externally suspended while we were waiting? 2220 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2221 if (threadIsSuspended) { 2222 // The semaphore has been incremented, but while we were waiting 2223 // another thread suspended us. We don't want to continue running 2224 // while suspended because that would surprise the thread that 2225 // suspended us. 2226 ret = ::sema_post(&sig_sem); 2227 assert(ret == 0, "sema_post() failed"); 2228 2229 thread->java_suspend_self(); 2230 } 2231 } while (threadIsSuspended); 2232 } 2233 } 2234 2235 int os::signal_lookup() { 2236 return check_pending_signals(false); 2237 } 2238 2239 int os::signal_wait() { 2240 return check_pending_signals(true); 2241 } 2242 2243 //////////////////////////////////////////////////////////////////////////////// 2244 // Virtual Memory 2245 2246 static int page_size = -1; 2247 2248 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will 2249 // clear this var if support is not available. 2250 static bool has_map_align = true; 2251 2252 int os::vm_page_size() { 2253 assert(page_size != -1, "must call os::init"); 2254 return page_size; 2255 } 2256 2257 // Solaris allocates memory by pages. 2258 int os::vm_allocation_granularity() { 2259 assert(page_size != -1, "must call os::init"); 2260 return page_size; 2261 } 2262 2263 static bool recoverable_mmap_error(int err) { 2264 // See if the error is one we can let the caller handle. This 2265 // list of errno values comes from the Solaris mmap(2) man page. 2266 switch (err) { 2267 case EBADF: 2268 case EINVAL: 2269 case ENOTSUP: 2270 // let the caller deal with these errors 2271 return true; 2272 2273 default: 2274 // Any remaining errors on this OS can cause our reserved mapping 2275 // to be lost. That can cause confusion where different data 2276 // structures think they have the same memory mapped. The worst 2277 // scenario is if both the VM and a library think they have the 2278 // same memory mapped. 2279 return false; 2280 } 2281 } 2282 2283 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec, 2284 int err) { 2285 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2286 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec, 2287 os::strerror(err), err); 2288 } 2289 2290 static void warn_fail_commit_memory(char* addr, size_t bytes, 2291 size_t alignment_hint, bool exec, 2292 int err) { 2293 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2294 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes, 2295 alignment_hint, exec, os::strerror(err), err); 2296 } 2297 2298 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) { 2299 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2300 size_t size = bytes; 2301 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2302 if (res != NULL) { 2303 if (UseNUMAInterleaving) { 2304 numa_make_global(addr, bytes); 2305 } 2306 return 0; 2307 } 2308 2309 int err = errno; // save errno from mmap() call in mmap_chunk() 2310 2311 if (!recoverable_mmap_error(err)) { 2312 warn_fail_commit_memory(addr, bytes, exec, err); 2313 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory."); 2314 } 2315 2316 return err; 2317 } 2318 2319 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 2320 return Solaris::commit_memory_impl(addr, bytes, exec) == 0; 2321 } 2322 2323 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec, 2324 const char* mesg) { 2325 assert(mesg != NULL, "mesg must be specified"); 2326 int err = os::Solaris::commit_memory_impl(addr, bytes, exec); 2327 if (err != 0) { 2328 // the caller wants all commit errors to exit with the specified mesg: 2329 warn_fail_commit_memory(addr, bytes, exec, err); 2330 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2331 } 2332 } 2333 2334 size_t os::Solaris::page_size_for_alignment(size_t alignment) { 2335 assert(is_aligned(alignment, (size_t) vm_page_size()), 2336 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, 2337 alignment, (size_t) vm_page_size()); 2338 2339 for (int i = 0; _page_sizes[i] != 0; i++) { 2340 if (is_aligned(alignment, _page_sizes[i])) { 2341 return _page_sizes[i]; 2342 } 2343 } 2344 2345 return (size_t) vm_page_size(); 2346 } 2347 2348 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, 2349 size_t alignment_hint, bool exec) { 2350 int err = Solaris::commit_memory_impl(addr, bytes, exec); 2351 if (err == 0 && UseLargePages && alignment_hint > 0) { 2352 assert(is_aligned(bytes, alignment_hint), 2353 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint); 2354 2355 // The syscall memcntl requires an exact page size (see man memcntl for details). 2356 size_t page_size = page_size_for_alignment(alignment_hint); 2357 if (page_size > (size_t) vm_page_size()) { 2358 (void)Solaris::setup_large_pages(addr, bytes, page_size); 2359 } 2360 } 2361 return err; 2362 } 2363 2364 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2365 bool exec) { 2366 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0; 2367 } 2368 2369 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, 2370 size_t alignment_hint, bool exec, 2371 const char* mesg) { 2372 assert(mesg != NULL, "mesg must be specified"); 2373 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec); 2374 if (err != 0) { 2375 // the caller wants all commit errors to exit with the specified mesg: 2376 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err); 2377 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2378 } 2379 } 2380 2381 // Uncommit the pages in a specified region. 2382 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { 2383 if (madvise(addr, bytes, MADV_FREE) < 0) { 2384 debug_only(warning("MADV_FREE failed.")); 2385 return; 2386 } 2387 } 2388 2389 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2390 return os::commit_memory(addr, size, !ExecMem); 2391 } 2392 2393 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2394 return os::uncommit_memory(addr, size); 2395 } 2396 2397 // Change the page size in a given range. 2398 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2399 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2400 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2401 if (UseLargePages) { 2402 size_t page_size = Solaris::page_size_for_alignment(alignment_hint); 2403 if (page_size > (size_t) vm_page_size()) { 2404 Solaris::setup_large_pages(addr, bytes, page_size); 2405 } 2406 } 2407 } 2408 2409 // Tell the OS to make the range local to the first-touching LWP 2410 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2411 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2412 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2413 debug_only(warning("MADV_ACCESS_LWP failed.")); 2414 } 2415 } 2416 2417 // Tell the OS that this range would be accessed from different LWPs. 2418 void os::numa_make_global(char *addr, size_t bytes) { 2419 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2420 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2421 debug_only(warning("MADV_ACCESS_MANY failed.")); 2422 } 2423 } 2424 2425 // Get the number of the locality groups. 2426 size_t os::numa_get_groups_num() { 2427 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2428 return n != -1 ? n : 1; 2429 } 2430 2431 // Get a list of leaf locality groups. A leaf lgroup is group that 2432 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2433 // board. An LWP is assigned to one of these groups upon creation. 2434 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2435 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2436 ids[0] = 0; 2437 return 1; 2438 } 2439 int result_size = 0, top = 1, bottom = 0, cur = 0; 2440 for (int k = 0; k < size; k++) { 2441 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2442 (Solaris::lgrp_id_t*)&ids[top], size - top); 2443 if (r == -1) { 2444 ids[0] = 0; 2445 return 1; 2446 } 2447 if (!r) { 2448 // That's a leaf node. 2449 assert(bottom <= cur, "Sanity check"); 2450 // Check if the node has memory 2451 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2452 NULL, 0, LGRP_RSRC_MEM) > 0) { 2453 ids[bottom++] = ids[cur]; 2454 } 2455 } 2456 top += r; 2457 cur++; 2458 } 2459 if (bottom == 0) { 2460 // Handle a situation, when the OS reports no memory available. 2461 // Assume UMA architecture. 2462 ids[0] = 0; 2463 return 1; 2464 } 2465 return bottom; 2466 } 2467 2468 // Detect the topology change. Typically happens during CPU plugging-unplugging. 2469 bool os::numa_topology_changed() { 2470 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2471 if (is_stale != -1 && is_stale) { 2472 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2473 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2474 assert(c != 0, "Failure to initialize LGRP API"); 2475 Solaris::set_lgrp_cookie(c); 2476 return true; 2477 } 2478 return false; 2479 } 2480 2481 // Get the group id of the current LWP. 2482 int os::numa_get_group_id() { 2483 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2484 if (lgrp_id == -1) { 2485 return 0; 2486 } 2487 const int size = os::numa_get_groups_num(); 2488 int *ids = (int*)alloca(size * sizeof(int)); 2489 2490 // Get the ids of all lgroups with memory; r is the count. 2491 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2492 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2493 if (r <= 0) { 2494 return 0; 2495 } 2496 return ids[os::random() % r]; 2497 } 2498 2499 // Request information about the page. 2500 bool os::get_page_info(char *start, page_info* info) { 2501 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2502 uint64_t addr = (uintptr_t)start; 2503 uint64_t outdata[2]; 2504 uint_t validity = 0; 2505 2506 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2507 return false; 2508 } 2509 2510 info->size = 0; 2511 info->lgrp_id = -1; 2512 2513 if ((validity & 1) != 0) { 2514 if ((validity & 2) != 0) { 2515 info->lgrp_id = outdata[0]; 2516 } 2517 if ((validity & 4) != 0) { 2518 info->size = outdata[1]; 2519 } 2520 return true; 2521 } 2522 return false; 2523 } 2524 2525 // Scan the pages from start to end until a page different than 2526 // the one described in the info parameter is encountered. 2527 char *os::scan_pages(char *start, char* end, page_info* page_expected, 2528 page_info* page_found) { 2529 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2530 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2531 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1]; 2532 uint_t validity[MAX_MEMINFO_CNT]; 2533 2534 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2535 uint64_t p = (uint64_t)start; 2536 while (p < (uint64_t)end) { 2537 addrs[0] = p; 2538 size_t addrs_count = 1; 2539 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { 2540 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2541 addrs_count++; 2542 } 2543 2544 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2545 return NULL; 2546 } 2547 2548 size_t i = 0; 2549 for (; i < addrs_count; i++) { 2550 if ((validity[i] & 1) != 0) { 2551 if ((validity[i] & 4) != 0) { 2552 if (outdata[types * i + 1] != page_expected->size) { 2553 break; 2554 } 2555 } else if (page_expected->size != 0) { 2556 break; 2557 } 2558 2559 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2560 if (outdata[types * i] != page_expected->lgrp_id) { 2561 break; 2562 } 2563 } 2564 } else { 2565 return NULL; 2566 } 2567 } 2568 2569 if (i < addrs_count) { 2570 if ((validity[i] & 2) != 0) { 2571 page_found->lgrp_id = outdata[types * i]; 2572 } else { 2573 page_found->lgrp_id = -1; 2574 } 2575 if ((validity[i] & 4) != 0) { 2576 page_found->size = outdata[types * i + 1]; 2577 } else { 2578 page_found->size = 0; 2579 } 2580 return (char*)addrs[i]; 2581 } 2582 2583 p = addrs[addrs_count - 1] + page_size; 2584 } 2585 return end; 2586 } 2587 2588 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 2589 size_t size = bytes; 2590 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2591 // uncommitted page. Otherwise, the read/write might succeed if we 2592 // have enough swap space to back the physical page. 2593 return 2594 NULL != Solaris::mmap_chunk(addr, size, 2595 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2596 PROT_NONE); 2597 } 2598 2599 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2600 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2601 2602 if (b == MAP_FAILED) { 2603 return NULL; 2604 } 2605 return b; 2606 } 2607 2608 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, 2609 size_t alignment_hint, bool fixed) { 2610 char* addr = requested_addr; 2611 int flags = MAP_PRIVATE | MAP_NORESERVE; 2612 2613 assert(!(fixed && (alignment_hint > 0)), 2614 "alignment hint meaningless with fixed mmap"); 2615 2616 if (fixed) { 2617 flags |= MAP_FIXED; 2618 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) { 2619 flags |= MAP_ALIGN; 2620 addr = (char*) alignment_hint; 2621 } 2622 2623 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2624 // uncommitted page. Otherwise, the read/write might succeed if we 2625 // have enough swap space to back the physical page. 2626 return mmap_chunk(addr, bytes, flags, PROT_NONE); 2627 } 2628 2629 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2630 size_t alignment_hint) { 2631 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, 2632 (requested_addr != NULL)); 2633 2634 guarantee(requested_addr == NULL || requested_addr == addr, 2635 "OS failed to return requested mmap address."); 2636 return addr; 2637 } 2638 2639 // Reserve memory at an arbitrary address, only if that area is 2640 // available (and not reserved for something else). 2641 2642 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2643 const int max_tries = 10; 2644 char* base[max_tries]; 2645 size_t size[max_tries]; 2646 2647 // Solaris adds a gap between mmap'ed regions. The size of the gap 2648 // is dependent on the requested size and the MMU. Our initial gap 2649 // value here is just a guess and will be corrected later. 2650 bool had_top_overlap = false; 2651 bool have_adjusted_gap = false; 2652 size_t gap = 0x400000; 2653 2654 // Assert only that the size is a multiple of the page size, since 2655 // that's all that mmap requires, and since that's all we really know 2656 // about at this low abstraction level. If we need higher alignment, 2657 // we can either pass an alignment to this method or verify alignment 2658 // in one of the methods further up the call chain. See bug 5044738. 2659 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2660 2661 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 2662 // Give it a try, if the kernel honors the hint we can return immediately. 2663 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 2664 2665 volatile int err = errno; 2666 if (addr == requested_addr) { 2667 return addr; 2668 } else if (addr != NULL) { 2669 pd_unmap_memory(addr, bytes); 2670 } 2671 2672 if (log_is_enabled(Warning, os)) { 2673 char buf[256]; 2674 buf[0] = '\0'; 2675 if (addr == NULL) { 2676 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err)); 2677 } 2678 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at " 2679 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT 2680 "%s", bytes, requested_addr, addr, buf); 2681 } 2682 2683 // Address hint method didn't work. Fall back to the old method. 2684 // In theory, once SNV becomes our oldest supported platform, this 2685 // code will no longer be needed. 2686 // 2687 // Repeatedly allocate blocks until the block is allocated at the 2688 // right spot. Give up after max_tries. 2689 int i; 2690 for (i = 0; i < max_tries; ++i) { 2691 base[i] = reserve_memory(bytes); 2692 2693 if (base[i] != NULL) { 2694 // Is this the block we wanted? 2695 if (base[i] == requested_addr) { 2696 size[i] = bytes; 2697 break; 2698 } 2699 2700 // check that the gap value is right 2701 if (had_top_overlap && !have_adjusted_gap) { 2702 size_t actual_gap = base[i-1] - base[i] - bytes; 2703 if (gap != actual_gap) { 2704 // adjust the gap value and retry the last 2 allocations 2705 assert(i > 0, "gap adjustment code problem"); 2706 have_adjusted_gap = true; // adjust the gap only once, just in case 2707 gap = actual_gap; 2708 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap); 2709 unmap_memory(base[i], bytes); 2710 unmap_memory(base[i-1], size[i-1]); 2711 i-=2; 2712 continue; 2713 } 2714 } 2715 2716 // Does this overlap the block we wanted? Give back the overlapped 2717 // parts and try again. 2718 // 2719 // There is still a bug in this code: if top_overlap == bytes, 2720 // the overlap is offset from requested region by the value of gap. 2721 // In this case giving back the overlapped part will not work, 2722 // because we'll give back the entire block at base[i] and 2723 // therefore the subsequent allocation will not generate a new gap. 2724 // This could be fixed with a new algorithm that used larger 2725 // or variable size chunks to find the requested region - 2726 // but such a change would introduce additional complications. 2727 // It's rare enough that the planets align for this bug, 2728 // so we'll just wait for a fix for 6204603/5003415 which 2729 // will provide a mmap flag to allow us to avoid this business. 2730 2731 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2732 if (top_overlap >= 0 && top_overlap < bytes) { 2733 had_top_overlap = true; 2734 unmap_memory(base[i], top_overlap); 2735 base[i] += top_overlap; 2736 size[i] = bytes - top_overlap; 2737 } else { 2738 size_t bottom_overlap = base[i] + bytes - requested_addr; 2739 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2740 if (bottom_overlap == 0) { 2741 log_info(os)("attempt_reserve_memory_at: possible alignment bug"); 2742 } 2743 unmap_memory(requested_addr, bottom_overlap); 2744 size[i] = bytes - bottom_overlap; 2745 } else { 2746 size[i] = bytes; 2747 } 2748 } 2749 } 2750 } 2751 2752 // Give back the unused reserved pieces. 2753 2754 for (int j = 0; j < i; ++j) { 2755 if (base[j] != NULL) { 2756 unmap_memory(base[j], size[j]); 2757 } 2758 } 2759 2760 return (i < max_tries) ? requested_addr : NULL; 2761 } 2762 2763 bool os::pd_release_memory(char* addr, size_t bytes) { 2764 size_t size = bytes; 2765 return munmap(addr, size) == 0; 2766 } 2767 2768 static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 2769 assert(addr == (char*)align_down((uintptr_t)addr, os::vm_page_size()), 2770 "addr must be page aligned"); 2771 int retVal = mprotect(addr, bytes, prot); 2772 return retVal == 0; 2773 } 2774 2775 // Protect memory (Used to pass readonly pages through 2776 // JNI GetArray<type>Elements with empty arrays.) 2777 // Also, used for serialization page and for compressed oops null pointer 2778 // checking. 2779 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2780 bool is_committed) { 2781 unsigned int p = 0; 2782 switch (prot) { 2783 case MEM_PROT_NONE: p = PROT_NONE; break; 2784 case MEM_PROT_READ: p = PROT_READ; break; 2785 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2786 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2787 default: 2788 ShouldNotReachHere(); 2789 } 2790 // is_committed is unused. 2791 return solaris_mprotect(addr, bytes, p); 2792 } 2793 2794 // guard_memory and unguard_memory only happens within stack guard pages. 2795 // Since ISM pertains only to the heap, guard and unguard memory should not 2796 /// happen with an ISM region. 2797 bool os::guard_memory(char* addr, size_t bytes) { 2798 return solaris_mprotect(addr, bytes, PROT_NONE); 2799 } 2800 2801 bool os::unguard_memory(char* addr, size_t bytes) { 2802 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 2803 } 2804 2805 // Large page support 2806 static size_t _large_page_size = 0; 2807 2808 // Insertion sort for small arrays (descending order). 2809 static void insertion_sort_descending(size_t* array, int len) { 2810 for (int i = 0; i < len; i++) { 2811 size_t val = array[i]; 2812 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 2813 size_t tmp = array[key]; 2814 array[key] = array[key - 1]; 2815 array[key - 1] = tmp; 2816 } 2817 } 2818 } 2819 2820 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) { 2821 const unsigned int usable_count = VM_Version::page_size_count(); 2822 if (usable_count == 1) { 2823 return false; 2824 } 2825 2826 // Find the right getpagesizes interface. When solaris 11 is the minimum 2827 // build platform, getpagesizes() (without the '2') can be called directly. 2828 typedef int (*gps_t)(size_t[], int); 2829 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); 2830 if (gps_func == NULL) { 2831 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); 2832 if (gps_func == NULL) { 2833 if (warn) { 2834 warning("MPSS is not supported by the operating system."); 2835 } 2836 return false; 2837 } 2838 } 2839 2840 // Fill the array of page sizes. 2841 int n = (*gps_func)(_page_sizes, page_sizes_max); 2842 assert(n > 0, "Solaris bug?"); 2843 2844 if (n == page_sizes_max) { 2845 // Add a sentinel value (necessary only if the array was completely filled 2846 // since it is static (zeroed at initialization)). 2847 _page_sizes[--n] = 0; 2848 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 2849 } 2850 assert(_page_sizes[n] == 0, "missing sentinel"); 2851 trace_page_sizes("available page sizes", _page_sizes, n); 2852 2853 if (n == 1) return false; // Only one page size available. 2854 2855 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 2856 // select up to usable_count elements. First sort the array, find the first 2857 // acceptable value, then copy the usable sizes to the top of the array and 2858 // trim the rest. Make sure to include the default page size :-). 2859 // 2860 // A better policy could get rid of the 4M limit by taking the sizes of the 2861 // important VM memory regions (java heap and possibly the code cache) into 2862 // account. 2863 insertion_sort_descending(_page_sizes, n); 2864 const size_t size_limit = 2865 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 2866 int beg; 2867 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */; 2868 const int end = MIN2((int)usable_count, n) - 1; 2869 for (int cur = 0; cur < end; ++cur, ++beg) { 2870 _page_sizes[cur] = _page_sizes[beg]; 2871 } 2872 _page_sizes[end] = vm_page_size(); 2873 _page_sizes[end + 1] = 0; 2874 2875 if (_page_sizes[end] > _page_sizes[end - 1]) { 2876 // Default page size is not the smallest; sort again. 2877 insertion_sort_descending(_page_sizes, end + 1); 2878 } 2879 *page_size = _page_sizes[0]; 2880 2881 trace_page_sizes("usable page sizes", _page_sizes, end + 1); 2882 return true; 2883 } 2884 2885 void os::large_page_init() { 2886 if (UseLargePages) { 2887 // print a warning if any large page related flag is specified on command line 2888 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2889 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2890 2891 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 2892 } 2893 } 2894 2895 bool os::Solaris::is_valid_page_size(size_t bytes) { 2896 for (int i = 0; _page_sizes[i] != 0; i++) { 2897 if (_page_sizes[i] == bytes) { 2898 return true; 2899 } 2900 } 2901 return false; 2902 } 2903 2904 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) { 2905 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align); 2906 assert(is_aligned((void*) start, align), 2907 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align); 2908 assert(is_aligned(bytes, align), 2909 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align); 2910 2911 // Signal to OS that we want large pages for addresses 2912 // from addr, addr + bytes 2913 struct memcntl_mha mpss_struct; 2914 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 2915 mpss_struct.mha_pagesize = align; 2916 mpss_struct.mha_flags = 0; 2917 // Upon successful completion, memcntl() returns 0 2918 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) { 2919 debug_only(warning("Attempt to use MPSS failed.")); 2920 return false; 2921 } 2922 return true; 2923 } 2924 2925 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) { 2926 fatal("os::reserve_memory_special should not be called on Solaris."); 2927 return NULL; 2928 } 2929 2930 bool os::release_memory_special(char* base, size_t bytes) { 2931 fatal("os::release_memory_special should not be called on Solaris."); 2932 return false; 2933 } 2934 2935 size_t os::large_page_size() { 2936 return _large_page_size; 2937 } 2938 2939 // MPSS allows application to commit large page memory on demand; with ISM 2940 // the entire memory region must be allocated as shared memory. 2941 bool os::can_commit_large_page_memory() { 2942 return true; 2943 } 2944 2945 bool os::can_execute_large_page_memory() { 2946 return true; 2947 } 2948 2949 // Read calls from inside the vm need to perform state transitions 2950 size_t os::read(int fd, void *buf, unsigned int nBytes) { 2951 size_t res; 2952 JavaThread* thread = (JavaThread*)Thread::current(); 2953 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 2954 ThreadBlockInVM tbiv(thread); 2955 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 2956 return res; 2957 } 2958 2959 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 2960 size_t res; 2961 JavaThread* thread = (JavaThread*)Thread::current(); 2962 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 2963 ThreadBlockInVM tbiv(thread); 2964 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res); 2965 return res; 2966 } 2967 2968 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) { 2969 size_t res; 2970 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 2971 "Assumed _thread_in_native"); 2972 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 2973 return res; 2974 } 2975 2976 void os::naked_short_sleep(jlong ms) { 2977 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 2978 2979 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but 2980 // Solaris requires -lrt for this. 2981 usleep((ms * 1000)); 2982 2983 return; 2984 } 2985 2986 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2987 void os::infinite_sleep() { 2988 while (true) { // sleep forever ... 2989 ::sleep(100); // ... 100 seconds at a time 2990 } 2991 } 2992 2993 // Used to convert frequent JVM_Yield() to nops 2994 bool os::dont_yield() { 2995 if (DontYieldALot) { 2996 static hrtime_t last_time = 0; 2997 hrtime_t diff = getTimeNanos() - last_time; 2998 2999 if (diff < DontYieldALotInterval * 1000000) { 3000 return true; 3001 } 3002 3003 last_time += diff; 3004 3005 return false; 3006 } else { 3007 return false; 3008 } 3009 } 3010 3011 // Note that yield semantics are defined by the scheduling class to which 3012 // the thread currently belongs. Typically, yield will _not yield to 3013 // other equal or higher priority threads that reside on the dispatch queues 3014 // of other CPUs. 3015 3016 void os::naked_yield() { 3017 thr_yield(); 3018 } 3019 3020 // Interface for setting lwp priorities. We are using T2 libthread, 3021 // which forces the use of bound threads, so all of our threads will 3022 // be assigned to real lwp's. Using the thr_setprio function is 3023 // meaningless in this mode so we must adjust the real lwp's priority. 3024 // The routines below implement the getting and setting of lwp priorities. 3025 // 3026 // Note: There are three priority scales used on Solaris. Java priotities 3027 // which range from 1 to 10, libthread "thr_setprio" scale which range 3028 // from 0 to 127, and the current scheduling class of the process we 3029 // are running in. This is typically from -60 to +60. 3030 // The setting of the lwp priorities in done after a call to thr_setprio 3031 // so Java priorities are mapped to libthread priorities and we map from 3032 // the latter to lwp priorities. We don't keep priorities stored in 3033 // Java priorities since some of our worker threads want to set priorities 3034 // higher than all Java threads. 3035 // 3036 // For related information: 3037 // (1) man -s 2 priocntl 3038 // (2) man -s 4 priocntl 3039 // (3) man dispadmin 3040 // = librt.so 3041 // = libthread/common/rtsched.c - thrp_setlwpprio(). 3042 // = ps -cL <pid> ... to validate priority. 3043 // = sched_get_priority_min and _max 3044 // pthread_create 3045 // sched_setparam 3046 // pthread_setschedparam 3047 // 3048 // Assumptions: 3049 // + We assume that all threads in the process belong to the same 3050 // scheduling class. IE. an homogenous process. 3051 // + Must be root or in IA group to change change "interactive" attribute. 3052 // Priocntl() will fail silently. The only indication of failure is when 3053 // we read-back the value and notice that it hasn't changed. 3054 // + Interactive threads enter the runq at the head, non-interactive at the tail. 3055 // + For RT, change timeslice as well. Invariant: 3056 // constant "priority integral" 3057 // Konst == TimeSlice * (60-Priority) 3058 // Given a priority, compute appropriate timeslice. 3059 // + Higher numerical values have higher priority. 3060 3061 // sched class attributes 3062 typedef struct { 3063 int schedPolicy; // classID 3064 int maxPrio; 3065 int minPrio; 3066 } SchedInfo; 3067 3068 3069 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; 3070 3071 #ifdef ASSERT 3072 static int ReadBackValidate = 1; 3073 #endif 3074 static int myClass = 0; 3075 static int myMin = 0; 3076 static int myMax = 0; 3077 static int myCur = 0; 3078 static bool priocntl_enable = false; 3079 3080 static const int criticalPrio = FXCriticalPriority; 3081 static int java_MaxPriority_to_os_priority = 0; // Saved mapping 3082 3083 3084 // lwp_priocntl_init 3085 // 3086 // Try to determine the priority scale for our process. 3087 // 3088 // Return errno or 0 if OK. 3089 // 3090 static int lwp_priocntl_init() { 3091 int rslt; 3092 pcinfo_t ClassInfo; 3093 pcparms_t ParmInfo; 3094 int i; 3095 3096 if (!UseThreadPriorities) return 0; 3097 3098 // If ThreadPriorityPolicy is 1, switch tables 3099 if (ThreadPriorityPolicy == 1) { 3100 for (i = 0; i < CriticalPriority+1; i++) 3101 os::java_to_os_priority[i] = prio_policy1[i]; 3102 } 3103 if (UseCriticalJavaThreadPriority) { 3104 // MaxPriority always maps to the FX scheduling class and criticalPrio. 3105 // See set_native_priority() and set_lwp_class_and_priority(). 3106 // Save original MaxPriority mapping in case attempt to 3107 // use critical priority fails. 3108 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; 3109 // Set negative to distinguish from other priorities 3110 os::java_to_os_priority[MaxPriority] = -criticalPrio; 3111 } 3112 3113 // Get IDs for a set of well-known scheduling classes. 3114 // TODO-FIXME: GETCLINFO returns the current # of classes in the 3115 // the system. We should have a loop that iterates over the 3116 // classID values, which are known to be "small" integers. 3117 3118 strcpy(ClassInfo.pc_clname, "TS"); 3119 ClassInfo.pc_cid = -1; 3120 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3121 if (rslt < 0) return errno; 3122 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 3123 tsLimits.schedPolicy = ClassInfo.pc_cid; 3124 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 3125 tsLimits.minPrio = -tsLimits.maxPrio; 3126 3127 strcpy(ClassInfo.pc_clname, "IA"); 3128 ClassInfo.pc_cid = -1; 3129 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3130 if (rslt < 0) return errno; 3131 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 3132 iaLimits.schedPolicy = ClassInfo.pc_cid; 3133 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 3134 iaLimits.minPrio = -iaLimits.maxPrio; 3135 3136 strcpy(ClassInfo.pc_clname, "RT"); 3137 ClassInfo.pc_cid = -1; 3138 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3139 if (rslt < 0) return errno; 3140 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 3141 rtLimits.schedPolicy = ClassInfo.pc_cid; 3142 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 3143 rtLimits.minPrio = 0; 3144 3145 strcpy(ClassInfo.pc_clname, "FX"); 3146 ClassInfo.pc_cid = -1; 3147 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3148 if (rslt < 0) return errno; 3149 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); 3150 fxLimits.schedPolicy = ClassInfo.pc_cid; 3151 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; 3152 fxLimits.minPrio = 0; 3153 3154 // Query our "current" scheduling class. 3155 // This will normally be IA, TS or, rarely, FX or RT. 3156 memset(&ParmInfo, 0, sizeof(ParmInfo)); 3157 ParmInfo.pc_cid = PC_CLNULL; 3158 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3159 if (rslt < 0) return errno; 3160 myClass = ParmInfo.pc_cid; 3161 3162 // We now know our scheduling classId, get specific information 3163 // about the class. 3164 ClassInfo.pc_cid = myClass; 3165 ClassInfo.pc_clname[0] = 0; 3166 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); 3167 if (rslt < 0) return errno; 3168 3169 if (ThreadPriorityVerbose) { 3170 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 3171 } 3172 3173 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3174 ParmInfo.pc_cid = PC_CLNULL; 3175 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3176 if (rslt < 0) return errno; 3177 3178 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3179 myMin = rtLimits.minPrio; 3180 myMax = rtLimits.maxPrio; 3181 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3182 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3183 myMin = iaLimits.minPrio; 3184 myMax = iaLimits.maxPrio; 3185 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 3186 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3187 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3188 myMin = tsLimits.minPrio; 3189 myMax = tsLimits.maxPrio; 3190 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 3191 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3192 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3193 myMin = fxLimits.minPrio; 3194 myMax = fxLimits.maxPrio; 3195 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict 3196 } else { 3197 // No clue - punt 3198 if (ThreadPriorityVerbose) { 3199 tty->print_cr("Unknown scheduling class: %s ... \n", 3200 ClassInfo.pc_clname); 3201 } 3202 return EINVAL; // no clue, punt 3203 } 3204 3205 if (ThreadPriorityVerbose) { 3206 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax); 3207 } 3208 3209 priocntl_enable = true; // Enable changing priorities 3210 return 0; 3211 } 3212 3213 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 3214 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 3215 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 3216 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) 3217 3218 3219 // scale_to_lwp_priority 3220 // 3221 // Convert from the libthread "thr_setprio" scale to our current 3222 // lwp scheduling class scale. 3223 // 3224 static int scale_to_lwp_priority(int rMin, int rMax, int x) { 3225 int v; 3226 3227 if (x == 127) return rMax; // avoid round-down 3228 v = (((x*(rMax-rMin)))/128)+rMin; 3229 return v; 3230 } 3231 3232 3233 // set_lwp_class_and_priority 3234 int set_lwp_class_and_priority(int ThreadID, int lwpid, 3235 int newPrio, int new_class, bool scale) { 3236 int rslt; 3237 int Actual, Expected, prv; 3238 pcparms_t ParmInfo; // for GET-SET 3239 #ifdef ASSERT 3240 pcparms_t ReadBack; // for readback 3241 #endif 3242 3243 // Set priority via PC_GETPARMS, update, PC_SETPARMS 3244 // Query current values. 3245 // TODO: accelerate this by eliminating the PC_GETPARMS call. 3246 // Cache "pcparms_t" in global ParmCache. 3247 // TODO: elide set-to-same-value 3248 3249 // If something went wrong on init, don't change priorities. 3250 if (!priocntl_enable) { 3251 if (ThreadPriorityVerbose) { 3252 tty->print_cr("Trying to set priority but init failed, ignoring"); 3253 } 3254 return EINVAL; 3255 } 3256 3257 // If lwp hasn't started yet, just return 3258 // the _start routine will call us again. 3259 if (lwpid <= 0) { 3260 if (ThreadPriorityVerbose) { 3261 tty->print_cr("deferring the set_lwp_class_and_priority of thread " 3262 INTPTR_FORMAT " to %d, lwpid not set", 3263 ThreadID, newPrio); 3264 } 3265 return 0; 3266 } 3267 3268 if (ThreadPriorityVerbose) { 3269 tty->print_cr ("set_lwp_class_and_priority(" 3270 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 3271 ThreadID, lwpid, newPrio); 3272 } 3273 3274 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3275 ParmInfo.pc_cid = PC_CLNULL; 3276 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 3277 if (rslt < 0) return errno; 3278 3279 int cur_class = ParmInfo.pc_cid; 3280 ParmInfo.pc_cid = (id_t)new_class; 3281 3282 if (new_class == rtLimits.schedPolicy) { 3283 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 3284 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, 3285 rtLimits.maxPrio, newPrio) 3286 : newPrio; 3287 rtInfo->rt_tqsecs = RT_NOCHANGE; 3288 rtInfo->rt_tqnsecs = RT_NOCHANGE; 3289 if (ThreadPriorityVerbose) { 3290 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 3291 } 3292 } else if (new_class == iaLimits.schedPolicy) { 3293 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3294 int maxClamped = MIN2(iaLimits.maxPrio, 3295 cur_class == new_class 3296 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); 3297 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, 3298 maxClamped, newPrio) 3299 : newPrio; 3300 iaInfo->ia_uprilim = cur_class == new_class 3301 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; 3302 iaInfo->ia_mode = IA_NOCHANGE; 3303 if (ThreadPriorityVerbose) { 3304 tty->print_cr("IA: [%d...%d] %d->%d\n", 3305 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 3306 } 3307 } else if (new_class == tsLimits.schedPolicy) { 3308 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3309 int maxClamped = MIN2(tsLimits.maxPrio, 3310 cur_class == new_class 3311 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); 3312 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, 3313 maxClamped, newPrio) 3314 : newPrio; 3315 tsInfo->ts_uprilim = cur_class == new_class 3316 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; 3317 if (ThreadPriorityVerbose) { 3318 tty->print_cr("TS: [%d...%d] %d->%d\n", 3319 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 3320 } 3321 } else if (new_class == fxLimits.schedPolicy) { 3322 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3323 int maxClamped = MIN2(fxLimits.maxPrio, 3324 cur_class == new_class 3325 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); 3326 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, 3327 maxClamped, newPrio) 3328 : newPrio; 3329 fxInfo->fx_uprilim = cur_class == new_class 3330 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; 3331 fxInfo->fx_tqsecs = FX_NOCHANGE; 3332 fxInfo->fx_tqnsecs = FX_NOCHANGE; 3333 if (ThreadPriorityVerbose) { 3334 tty->print_cr("FX: [%d...%d] %d->%d\n", 3335 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); 3336 } 3337 } else { 3338 if (ThreadPriorityVerbose) { 3339 tty->print_cr("Unknown new scheduling class %d\n", new_class); 3340 } 3341 return EINVAL; // no clue, punt 3342 } 3343 3344 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 3345 if (ThreadPriorityVerbose && rslt) { 3346 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 3347 } 3348 if (rslt < 0) return errno; 3349 3350 #ifdef ASSERT 3351 // Sanity check: read back what we just attempted to set. 3352 // In theory it could have changed in the interim ... 3353 // 3354 // The priocntl system call is tricky. 3355 // Sometimes it'll validate the priority value argument and 3356 // return EINVAL if unhappy. At other times it fails silently. 3357 // Readbacks are prudent. 3358 3359 if (!ReadBackValidate) return 0; 3360 3361 memset(&ReadBack, 0, sizeof(pcparms_t)); 3362 ReadBack.pc_cid = PC_CLNULL; 3363 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 3364 assert(rslt >= 0, "priocntl failed"); 3365 Actual = Expected = 0xBAD; 3366 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3367 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3368 Actual = RTPRI(ReadBack)->rt_pri; 3369 Expected = RTPRI(ParmInfo)->rt_pri; 3370 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3371 Actual = IAPRI(ReadBack)->ia_upri; 3372 Expected = IAPRI(ParmInfo)->ia_upri; 3373 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3374 Actual = TSPRI(ReadBack)->ts_upri; 3375 Expected = TSPRI(ParmInfo)->ts_upri; 3376 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3377 Actual = FXPRI(ReadBack)->fx_upri; 3378 Expected = FXPRI(ParmInfo)->fx_upri; 3379 } else { 3380 if (ThreadPriorityVerbose) { 3381 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", 3382 ParmInfo.pc_cid); 3383 } 3384 } 3385 3386 if (Actual != Expected) { 3387 if (ThreadPriorityVerbose) { 3388 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 3389 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 3390 } 3391 } 3392 #endif 3393 3394 return 0; 3395 } 3396 3397 // Solaris only gives access to 128 real priorities at a time, 3398 // so we expand Java's ten to fill this range. This would be better 3399 // if we dynamically adjusted relative priorities. 3400 // 3401 // The ThreadPriorityPolicy option allows us to select 2 different 3402 // priority scales. 3403 // 3404 // ThreadPriorityPolicy=0 3405 // Since the Solaris' default priority is MaximumPriority, we do not 3406 // set a priority lower than Max unless a priority lower than 3407 // NormPriority is requested. 3408 // 3409 // ThreadPriorityPolicy=1 3410 // This mode causes the priority table to get filled with 3411 // linear values. NormPriority get's mapped to 50% of the 3412 // Maximum priority an so on. This will cause VM threads 3413 // to get unfair treatment against other Solaris processes 3414 // which do not explicitly alter their thread priorities. 3415 3416 int os::java_to_os_priority[CriticalPriority + 1] = { 3417 -99999, // 0 Entry should never be used 3418 3419 0, // 1 MinPriority 3420 32, // 2 3421 64, // 3 3422 3423 96, // 4 3424 127, // 5 NormPriority 3425 127, // 6 3426 3427 127, // 7 3428 127, // 8 3429 127, // 9 NearMaxPriority 3430 3431 127, // 10 MaxPriority 3432 3433 -criticalPrio // 11 CriticalPriority 3434 }; 3435 3436 OSReturn os::set_native_priority(Thread* thread, int newpri) { 3437 OSThread* osthread = thread->osthread(); 3438 3439 // Save requested priority in case the thread hasn't been started 3440 osthread->set_native_priority(newpri); 3441 3442 // Check for critical priority request 3443 bool fxcritical = false; 3444 if (newpri == -criticalPrio) { 3445 fxcritical = true; 3446 newpri = criticalPrio; 3447 } 3448 3449 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 3450 if (!UseThreadPriorities) return OS_OK; 3451 3452 int status = 0; 3453 3454 if (!fxcritical) { 3455 // Use thr_setprio only if we have a priority that thr_setprio understands 3456 status = thr_setprio(thread->osthread()->thread_id(), newpri); 3457 } 3458 3459 int lwp_status = 3460 set_lwp_class_and_priority(osthread->thread_id(), 3461 osthread->lwp_id(), 3462 newpri, 3463 fxcritical ? fxLimits.schedPolicy : myClass, 3464 !fxcritical); 3465 if (lwp_status != 0 && fxcritical) { 3466 // Try again, this time without changing the scheduling class 3467 newpri = java_MaxPriority_to_os_priority; 3468 lwp_status = set_lwp_class_and_priority(osthread->thread_id(), 3469 osthread->lwp_id(), 3470 newpri, myClass, false); 3471 } 3472 status |= lwp_status; 3473 return (status == 0) ? OS_OK : OS_ERR; 3474 } 3475 3476 3477 OSReturn os::get_native_priority(const Thread* const thread, 3478 int *priority_ptr) { 3479 int p; 3480 if (!UseThreadPriorities) { 3481 *priority_ptr = NormalPriority; 3482 return OS_OK; 3483 } 3484 int status = thr_getprio(thread->osthread()->thread_id(), &p); 3485 if (status != 0) { 3486 return OS_ERR; 3487 } 3488 *priority_ptr = p; 3489 return OS_OK; 3490 } 3491 3492 3493 // Hint to the underlying OS that a task switch would not be good. 3494 // Void return because it's a hint and can fail. 3495 void os::hint_no_preempt() { 3496 schedctl_start(schedctl_init()); 3497 } 3498 3499 //////////////////////////////////////////////////////////////////////////////// 3500 // suspend/resume support 3501 3502 // The low-level signal-based suspend/resume support is a remnant from the 3503 // old VM-suspension that used to be for java-suspension, safepoints etc, 3504 // within hotspot. Currently used by JFR's OSThreadSampler 3505 // 3506 // The remaining code is greatly simplified from the more general suspension 3507 // code that used to be used. 3508 // 3509 // The protocol is quite simple: 3510 // - suspend: 3511 // - sends a signal to the target thread 3512 // - polls the suspend state of the osthread using a yield loop 3513 // - target thread signal handler (SR_handler) sets suspend state 3514 // and blocks in sigsuspend until continued 3515 // - resume: 3516 // - sets target osthread state to continue 3517 // - sends signal to end the sigsuspend loop in the SR_handler 3518 // 3519 // Note that the SR_lock plays no role in this suspend/resume protocol, 3520 // but is checked for NULL in SR_handler as a thread termination indicator. 3521 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. 3522 // 3523 // Note that resume_clear_context() and suspend_save_context() are needed 3524 // by SR_handler(), so that fetch_frame_from_ucontext() works, 3525 // which in part is used by: 3526 // - Forte Analyzer: AsyncGetCallTrace() 3527 // - StackBanging: get_frame_at_stack_banging_point() 3528 // - JFR: get_topframe()-->....-->get_valid_uc_in_signal_handler() 3529 3530 static void resume_clear_context(OSThread *osthread) { 3531 osthread->set_ucontext(NULL); 3532 } 3533 3534 static void suspend_save_context(OSThread *osthread, ucontext_t* context) { 3535 osthread->set_ucontext(context); 3536 } 3537 3538 static PosixSemaphore sr_semaphore; 3539 3540 void os::Solaris::SR_handler(Thread* thread, ucontext_t* context) { 3541 // Save and restore errno to avoid confusing native code with EINTR 3542 // after sigsuspend. 3543 int old_errno = errno; 3544 3545 OSThread* osthread = thread->osthread(); 3546 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 3547 3548 os::SuspendResume::State current = osthread->sr.state(); 3549 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 3550 suspend_save_context(osthread, context); 3551 3552 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 3553 os::SuspendResume::State state = osthread->sr.suspended(); 3554 if (state == os::SuspendResume::SR_SUSPENDED) { 3555 sigset_t suspend_set; // signals for sigsuspend() 3556 3557 // get current set of blocked signals and unblock resume signal 3558 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 3559 sigdelset(&suspend_set, ASYNC_SIGNAL); 3560 3561 sr_semaphore.signal(); 3562 // wait here until we are resumed 3563 while (1) { 3564 sigsuspend(&suspend_set); 3565 3566 os::SuspendResume::State result = osthread->sr.running(); 3567 if (result == os::SuspendResume::SR_RUNNING) { 3568 sr_semaphore.signal(); 3569 break; 3570 } 3571 } 3572 3573 } else if (state == os::SuspendResume::SR_RUNNING) { 3574 // request was cancelled, continue 3575 } else { 3576 ShouldNotReachHere(); 3577 } 3578 3579 resume_clear_context(osthread); 3580 } else if (current == os::SuspendResume::SR_RUNNING) { 3581 // request was cancelled, continue 3582 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 3583 // ignore 3584 } else { 3585 // ignore 3586 } 3587 3588 errno = old_errno; 3589 } 3590 3591 void os::print_statistics() { 3592 } 3593 3594 bool os::message_box(const char* title, const char* message) { 3595 int i; 3596 fdStream err(defaultStream::error_fd()); 3597 for (i = 0; i < 78; i++) err.print_raw("="); 3598 err.cr(); 3599 err.print_raw_cr(title); 3600 for (i = 0; i < 78; i++) err.print_raw("-"); 3601 err.cr(); 3602 err.print_raw_cr(message); 3603 for (i = 0; i < 78; i++) err.print_raw("="); 3604 err.cr(); 3605 3606 char buf[16]; 3607 // Prevent process from exiting upon "read error" without consuming all CPU 3608 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3609 3610 return buf[0] == 'y' || buf[0] == 'Y'; 3611 } 3612 3613 static int sr_notify(OSThread* osthread) { 3614 int status = thr_kill(osthread->thread_id(), ASYNC_SIGNAL); 3615 assert_status(status == 0, status, "thr_kill"); 3616 return status; 3617 } 3618 3619 // "Randomly" selected value for how long we want to spin 3620 // before bailing out on suspending a thread, also how often 3621 // we send a signal to a thread we want to resume 3622 static const int RANDOMLY_LARGE_INTEGER = 1000000; 3623 static const int RANDOMLY_LARGE_INTEGER2 = 100; 3624 3625 static bool do_suspend(OSThread* osthread) { 3626 assert(osthread->sr.is_running(), "thread should be running"); 3627 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 3628 3629 // mark as suspended and send signal 3630 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 3631 // failed to switch, state wasn't running? 3632 ShouldNotReachHere(); 3633 return false; 3634 } 3635 3636 if (sr_notify(osthread) != 0) { 3637 ShouldNotReachHere(); 3638 } 3639 3640 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 3641 while (true) { 3642 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) { 3643 break; 3644 } else { 3645 // timeout 3646 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 3647 if (cancelled == os::SuspendResume::SR_RUNNING) { 3648 return false; 3649 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 3650 // make sure that we consume the signal on the semaphore as well 3651 sr_semaphore.wait(); 3652 break; 3653 } else { 3654 ShouldNotReachHere(); 3655 return false; 3656 } 3657 } 3658 } 3659 3660 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 3661 return true; 3662 } 3663 3664 static void do_resume(OSThread* osthread) { 3665 assert(osthread->sr.is_suspended(), "thread should be suspended"); 3666 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 3667 3668 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 3669 // failed to switch to WAKEUP_REQUEST 3670 ShouldNotReachHere(); 3671 return; 3672 } 3673 3674 while (true) { 3675 if (sr_notify(osthread) == 0) { 3676 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 3677 if (osthread->sr.is_running()) { 3678 return; 3679 } 3680 } 3681 } else { 3682 ShouldNotReachHere(); 3683 } 3684 } 3685 3686 guarantee(osthread->sr.is_running(), "Must be running!"); 3687 } 3688 3689 void os::SuspendedThreadTask::internal_do_task() { 3690 if (do_suspend(_thread->osthread())) { 3691 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3692 do_task(context); 3693 do_resume(_thread->osthread()); 3694 } 3695 } 3696 3697 // This does not do anything on Solaris. This is basically a hook for being 3698 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 3699 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3700 const methodHandle& method, JavaCallArguments* args, 3701 Thread* thread) { 3702 f(value, method, args, thread); 3703 } 3704 3705 // This routine may be used by user applications as a "hook" to catch signals. 3706 // The user-defined signal handler must pass unrecognized signals to this 3707 // routine, and if it returns true (non-zero), then the signal handler must 3708 // return immediately. If the flag "abort_if_unrecognized" is true, then this 3709 // routine will never retun false (zero), but instead will execute a VM panic 3710 // routine kill the process. 3711 // 3712 // If this routine returns false, it is OK to call it again. This allows 3713 // the user-defined signal handler to perform checks either before or after 3714 // the VM performs its own checks. Naturally, the user code would be making 3715 // a serious error if it tried to handle an exception (such as a null check 3716 // or breakpoint) that the VM was generating for its own correct operation. 3717 // 3718 // This routine may recognize any of the following kinds of signals: 3719 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 3720 // ASYNC_SIGNAL. 3721 // It should be consulted by handlers for any of those signals. 3722 // 3723 // The caller of this routine must pass in the three arguments supplied 3724 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 3725 // field of the structure passed to sigaction(). This routine assumes that 3726 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3727 // 3728 // Note that the VM will print warnings if it detects conflicting signal 3729 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3730 // 3731 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo, 3732 siginfo_t* siginfo, 3733 void* ucontext, 3734 int abort_if_unrecognized); 3735 3736 3737 void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 3738 int orig_errno = errno; // Preserve errno value over signal handler. 3739 JVM_handle_solaris_signal(sig, info, ucVoid, true); 3740 errno = orig_errno; 3741 } 3742 3743 // This boolean allows users to forward their own non-matching signals 3744 // to JVM_handle_solaris_signal, harmlessly. 3745 bool os::Solaris::signal_handlers_are_installed = false; 3746 3747 // For signal-chaining 3748 bool os::Solaris::libjsig_is_loaded = false; 3749 typedef struct sigaction *(*get_signal_t)(int); 3750 get_signal_t os::Solaris::get_signal_action = NULL; 3751 3752 struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 3753 struct sigaction *actp = NULL; 3754 3755 if ((libjsig_is_loaded) && (sig <= Maxsignum)) { 3756 // Retrieve the old signal handler from libjsig 3757 actp = (*get_signal_action)(sig); 3758 } 3759 if (actp == NULL) { 3760 // Retrieve the preinstalled signal handler from jvm 3761 actp = get_preinstalled_handler(sig); 3762 } 3763 3764 return actp; 3765 } 3766 3767 static bool call_chained_handler(struct sigaction *actp, int sig, 3768 siginfo_t *siginfo, void *context) { 3769 // Call the old signal handler 3770 if (actp->sa_handler == SIG_DFL) { 3771 // It's more reasonable to let jvm treat it as an unexpected exception 3772 // instead of taking the default action. 3773 return false; 3774 } else if (actp->sa_handler != SIG_IGN) { 3775 if ((actp->sa_flags & SA_NODEFER) == 0) { 3776 // automaticlly block the signal 3777 sigaddset(&(actp->sa_mask), sig); 3778 } 3779 3780 sa_handler_t hand; 3781 sa_sigaction_t sa; 3782 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3783 // retrieve the chained handler 3784 if (siginfo_flag_set) { 3785 sa = actp->sa_sigaction; 3786 } else { 3787 hand = actp->sa_handler; 3788 } 3789 3790 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3791 actp->sa_handler = SIG_DFL; 3792 } 3793 3794 // try to honor the signal mask 3795 sigset_t oset; 3796 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3797 3798 // call into the chained handler 3799 if (siginfo_flag_set) { 3800 (*sa)(sig, siginfo, context); 3801 } else { 3802 (*hand)(sig); 3803 } 3804 3805 // restore the signal mask 3806 pthread_sigmask(SIG_SETMASK, &oset, 0); 3807 } 3808 // Tell jvm's signal handler the signal is taken care of. 3809 return true; 3810 } 3811 3812 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3813 bool chained = false; 3814 // signal-chaining 3815 if (UseSignalChaining) { 3816 struct sigaction *actp = get_chained_signal_action(sig); 3817 if (actp != NULL) { 3818 chained = call_chained_handler(actp, sig, siginfo, context); 3819 } 3820 } 3821 return chained; 3822 } 3823 3824 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 3825 assert((chainedsigactions != (struct sigaction *)NULL) && 3826 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3827 if (preinstalled_sigs[sig] != 0) { 3828 return &chainedsigactions[sig]; 3829 } 3830 return NULL; 3831 } 3832 3833 void os::Solaris::save_preinstalled_handler(int sig, 3834 struct sigaction& oldAct) { 3835 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 3836 assert((chainedsigactions != (struct sigaction *)NULL) && 3837 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3838 chainedsigactions[sig] = oldAct; 3839 preinstalled_sigs[sig] = 1; 3840 } 3841 3842 void os::Solaris::set_signal_handler(int sig, bool set_installed, 3843 bool oktochain) { 3844 // Check for overwrite. 3845 struct sigaction oldAct; 3846 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3847 void* oldhand = 3848 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3849 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3850 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3851 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3852 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 3853 if (AllowUserSignalHandlers || !set_installed) { 3854 // Do not overwrite; user takes responsibility to forward to us. 3855 return; 3856 } else if (UseSignalChaining) { 3857 if (oktochain) { 3858 // save the old handler in jvm 3859 save_preinstalled_handler(sig, oldAct); 3860 } else { 3861 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal."); 3862 } 3863 // libjsig also interposes the sigaction() call below and saves the 3864 // old sigaction on it own. 3865 } else { 3866 fatal("Encountered unexpected pre-existing sigaction handler " 3867 "%#lx for signal %d.", (long)oldhand, sig); 3868 } 3869 } 3870 3871 struct sigaction sigAct; 3872 sigfillset(&(sigAct.sa_mask)); 3873 sigAct.sa_handler = SIG_DFL; 3874 3875 sigAct.sa_sigaction = signalHandler; 3876 // Handle SIGSEGV on alternate signal stack if 3877 // not using stack banging 3878 if (!UseStackBanging && sig == SIGSEGV) { 3879 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 3880 } else { 3881 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 3882 } 3883 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 3884 3885 sigaction(sig, &sigAct, &oldAct); 3886 3887 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3888 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3889 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3890 } 3891 3892 3893 #define DO_SIGNAL_CHECK(sig) \ 3894 do { \ 3895 if (!sigismember(&check_signal_done, sig)) { \ 3896 os::Solaris::check_signal_handler(sig); \ 3897 } \ 3898 } while (0) 3899 3900 // This method is a periodic task to check for misbehaving JNI applications 3901 // under CheckJNI, we can add any periodic checks here 3902 3903 void os::run_periodic_checks() { 3904 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 3905 // thereby preventing a NULL checks. 3906 if (!check_addr0_done) check_addr0_done = check_addr0(tty); 3907 3908 if (check_signals == false) return; 3909 3910 // SEGV and BUS if overridden could potentially prevent 3911 // generation of hs*.log in the event of a crash, debugging 3912 // such a case can be very challenging, so we absolutely 3913 // check for the following for a good measure: 3914 DO_SIGNAL_CHECK(SIGSEGV); 3915 DO_SIGNAL_CHECK(SIGILL); 3916 DO_SIGNAL_CHECK(SIGFPE); 3917 DO_SIGNAL_CHECK(SIGBUS); 3918 DO_SIGNAL_CHECK(SIGPIPE); 3919 DO_SIGNAL_CHECK(SIGXFSZ); 3920 DO_SIGNAL_CHECK(ASYNC_SIGNAL); 3921 3922 // ReduceSignalUsage allows the user to override these handlers 3923 // see comments at the very top and jvm_solaris.h 3924 if (!ReduceSignalUsage) { 3925 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3926 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3927 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3928 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3929 } 3930 } 3931 3932 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3933 3934 static os_sigaction_t os_sigaction = NULL; 3935 3936 void os::Solaris::check_signal_handler(int sig) { 3937 char buf[O_BUFLEN]; 3938 address jvmHandler = NULL; 3939 3940 struct sigaction act; 3941 if (os_sigaction == NULL) { 3942 // only trust the default sigaction, in case it has been interposed 3943 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3944 if (os_sigaction == NULL) return; 3945 } 3946 3947 os_sigaction(sig, (struct sigaction*)NULL, &act); 3948 3949 address thisHandler = (act.sa_flags & SA_SIGINFO) 3950 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3951 : CAST_FROM_FN_PTR(address, act.sa_handler); 3952 3953 3954 switch (sig) { 3955 case SIGSEGV: 3956 case SIGBUS: 3957 case SIGFPE: 3958 case SIGPIPE: 3959 case SIGXFSZ: 3960 case SIGILL: 3961 case ASYNC_SIGNAL: 3962 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 3963 break; 3964 3965 case SHUTDOWN1_SIGNAL: 3966 case SHUTDOWN2_SIGNAL: 3967 case SHUTDOWN3_SIGNAL: 3968 case BREAK_SIGNAL: 3969 jvmHandler = (address)user_handler(); 3970 break; 3971 3972 default: 3973 return; 3974 } 3975 3976 if (thisHandler != jvmHandler) { 3977 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3978 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3979 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3980 // No need to check this sig any longer 3981 sigaddset(&check_signal_done, sig); 3982 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3983 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3984 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3985 exception_name(sig, buf, O_BUFLEN)); 3986 } 3987 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 3988 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3989 tty->print("expected:"); 3990 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig)); 3991 tty->cr(); 3992 tty->print(" found:"); 3993 os::Posix::print_sa_flags(tty, act.sa_flags); 3994 tty->cr(); 3995 // No need to check this sig any longer 3996 sigaddset(&check_signal_done, sig); 3997 } 3998 3999 // Print all the signal handler state 4000 if (sigismember(&check_signal_done, sig)) { 4001 print_signal_handlers(tty, buf, O_BUFLEN); 4002 } 4003 4004 } 4005 4006 void os::Solaris::install_signal_handlers() { 4007 signal_handlers_are_installed = true; 4008 4009 // signal-chaining 4010 typedef void (*signal_setting_t)(); 4011 signal_setting_t begin_signal_setting = NULL; 4012 signal_setting_t end_signal_setting = NULL; 4013 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4014 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 4015 if (begin_signal_setting != NULL) { 4016 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4017 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 4018 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 4019 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 4020 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t, 4021 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version")); 4022 libjsig_is_loaded = true; 4023 if (os::Solaris::get_libjsig_version != NULL) { 4024 int libjsigversion = (*os::Solaris::get_libjsig_version)(); 4025 assert(libjsigversion == JSIG_VERSION_1_4_1, "libjsig version mismatch"); 4026 } 4027 assert(UseSignalChaining, "should enable signal-chaining"); 4028 } 4029 if (libjsig_is_loaded) { 4030 // Tell libjsig jvm is setting signal handlers 4031 (*begin_signal_setting)(); 4032 } 4033 4034 set_signal_handler(SIGSEGV, true, true); 4035 set_signal_handler(SIGPIPE, true, true); 4036 set_signal_handler(SIGXFSZ, true, true); 4037 set_signal_handler(SIGBUS, true, true); 4038 set_signal_handler(SIGILL, true, true); 4039 set_signal_handler(SIGFPE, true, true); 4040 set_signal_handler(ASYNC_SIGNAL, true, true); 4041 4042 if (libjsig_is_loaded) { 4043 // Tell libjsig jvm finishes setting signal handlers 4044 (*end_signal_setting)(); 4045 } 4046 4047 // We don't activate signal checker if libjsig is in place, we trust ourselves 4048 // and if UserSignalHandler is installed all bets are off. 4049 // Log that signal checking is off only if -verbose:jni is specified. 4050 if (CheckJNICalls) { 4051 if (libjsig_is_loaded) { 4052 if (PrintJNIResolving) { 4053 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 4054 } 4055 check_signals = false; 4056 } 4057 if (AllowUserSignalHandlers) { 4058 if (PrintJNIResolving) { 4059 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4060 } 4061 check_signals = false; 4062 } 4063 } 4064 } 4065 4066 4067 void report_error(const char* file_name, int line_no, const char* title, 4068 const char* format, ...); 4069 4070 // (Static) wrappers for the liblgrp API 4071 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 4072 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 4073 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 4074 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 4075 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 4076 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 4077 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 4078 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 4079 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 4080 4081 static address resolve_symbol_lazy(const char* name) { 4082 address addr = (address) dlsym(RTLD_DEFAULT, name); 4083 if (addr == NULL) { 4084 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 4085 addr = (address) dlsym(RTLD_NEXT, name); 4086 } 4087 return addr; 4088 } 4089 4090 static address resolve_symbol(const char* name) { 4091 address addr = resolve_symbol_lazy(name); 4092 if (addr == NULL) { 4093 fatal(dlerror()); 4094 } 4095 return addr; 4096 } 4097 4098 void os::Solaris::libthread_init() { 4099 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 4100 4101 lwp_priocntl_init(); 4102 4103 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 4104 if (func == NULL) { 4105 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 4106 // Guarantee that this VM is running on an new enough OS (5.6 or 4107 // later) that it will have a new enough libthread.so. 4108 guarantee(func != NULL, "libthread.so is too old."); 4109 } 4110 4111 int size; 4112 void (*handler_info_func)(address *, int *); 4113 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 4114 handler_info_func(&handler_start, &size); 4115 handler_end = handler_start + size; 4116 } 4117 4118 4119 int_fnP_mutex_tP os::Solaris::_mutex_lock; 4120 int_fnP_mutex_tP os::Solaris::_mutex_trylock; 4121 int_fnP_mutex_tP os::Solaris::_mutex_unlock; 4122 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 4123 int_fnP_mutex_tP os::Solaris::_mutex_destroy; 4124 int os::Solaris::_mutex_scope = USYNC_THREAD; 4125 4126 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 4127 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 4128 int_fnP_cond_tP os::Solaris::_cond_signal; 4129 int_fnP_cond_tP os::Solaris::_cond_broadcast; 4130 int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 4131 int_fnP_cond_tP os::Solaris::_cond_destroy; 4132 int os::Solaris::_cond_scope = USYNC_THREAD; 4133 4134 void os::Solaris::synchronization_init() { 4135 if (UseLWPSynchronization) { 4136 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 4137 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 4138 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 4139 os::Solaris::set_mutex_init(lwp_mutex_init); 4140 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 4141 os::Solaris::set_mutex_scope(USYNC_THREAD); 4142 4143 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 4144 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 4145 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 4146 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 4147 os::Solaris::set_cond_init(lwp_cond_init); 4148 os::Solaris::set_cond_destroy(lwp_cond_destroy); 4149 os::Solaris::set_cond_scope(USYNC_THREAD); 4150 } else { 4151 os::Solaris::set_mutex_scope(USYNC_THREAD); 4152 os::Solaris::set_cond_scope(USYNC_THREAD); 4153 4154 if (UsePthreads) { 4155 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 4156 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 4157 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 4158 os::Solaris::set_mutex_init(pthread_mutex_default_init); 4159 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 4160 4161 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 4162 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 4163 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 4164 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 4165 os::Solaris::set_cond_init(pthread_cond_default_init); 4166 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 4167 } else { 4168 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 4169 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 4170 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 4171 os::Solaris::set_mutex_init(::mutex_init); 4172 os::Solaris::set_mutex_destroy(::mutex_destroy); 4173 4174 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 4175 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 4176 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 4177 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 4178 os::Solaris::set_cond_init(::cond_init); 4179 os::Solaris::set_cond_destroy(::cond_destroy); 4180 } 4181 } 4182 } 4183 4184 bool os::Solaris::liblgrp_init() { 4185 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 4186 if (handle != NULL) { 4187 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 4188 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 4189 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 4190 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 4191 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 4192 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 4193 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 4194 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 4195 dlsym(handle, "lgrp_cookie_stale"))); 4196 4197 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 4198 set_lgrp_cookie(c); 4199 return true; 4200 } 4201 return false; 4202 } 4203 4204 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 4205 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 4206 static pset_getloadavg_type pset_getloadavg_ptr = NULL; 4207 4208 void init_pset_getloadavg_ptr(void) { 4209 pset_getloadavg_ptr = 4210 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 4211 if (pset_getloadavg_ptr == NULL) { 4212 log_warning(os)("pset_getloadavg function not found"); 4213 } 4214 } 4215 4216 int os::Solaris::_dev_zero_fd = -1; 4217 4218 // this is called _before_ the global arguments have been parsed 4219 void os::init(void) { 4220 _initial_pid = getpid(); 4221 4222 max_hrtime = first_hrtime = gethrtime(); 4223 4224 init_random(1234567); 4225 4226 page_size = sysconf(_SC_PAGESIZE); 4227 if (page_size == -1) { 4228 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 4229 } 4230 init_page_sizes((size_t) page_size); 4231 4232 Solaris::initialize_system_info(); 4233 4234 int fd = ::open("/dev/zero", O_RDWR); 4235 if (fd < 0) { 4236 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno)); 4237 } else { 4238 Solaris::set_dev_zero_fd(fd); 4239 4240 // Close on exec, child won't inherit. 4241 fcntl(fd, F_SETFD, FD_CLOEXEC); 4242 } 4243 4244 clock_tics_per_sec = CLK_TCK; 4245 4246 // check if dladdr1() exists; dladdr1 can provide more information than 4247 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 4248 // and is available on linker patches for 5.7 and 5.8. 4249 // libdl.so must have been loaded, this call is just an entry lookup 4250 void * hdl = dlopen("libdl.so", RTLD_NOW); 4251 if (hdl) { 4252 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 4253 } 4254 4255 // (Solaris only) this switches to calls that actually do locking. 4256 ThreadCritical::initialize(); 4257 4258 main_thread = thr_self(); 4259 4260 // dynamic lookup of functions that may not be available in our lowest 4261 // supported Solaris release 4262 void * handle = dlopen("libc.so.1", RTLD_LAZY); 4263 if (handle != NULL) { 4264 Solaris::_pthread_setname_np = // from 11.3 4265 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np"); 4266 } 4267 } 4268 4269 // To install functions for atexit system call 4270 extern "C" { 4271 static void perfMemory_exit_helper() { 4272 perfMemory_exit(); 4273 } 4274 } 4275 4276 // this is called _after_ the global arguments have been parsed 4277 jint os::init_2(void) { 4278 // try to enable extended file IO ASAP, see 6431278 4279 os::Solaris::try_enable_extended_io(); 4280 4281 // Allocate a single page and mark it as readable for safepoint polling. Also 4282 // use this first mmap call to check support for MAP_ALIGN. 4283 address polling_page = (address)Solaris::mmap_chunk((char*)page_size, 4284 page_size, 4285 MAP_PRIVATE | MAP_ALIGN, 4286 PROT_READ); 4287 if (polling_page == NULL) { 4288 has_map_align = false; 4289 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, 4290 PROT_READ); 4291 } 4292 4293 os::set_polling_page(polling_page); 4294 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page)); 4295 4296 if (!UseMembar) { 4297 address mem_serialize_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE); 4298 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 4299 os::set_memory_serialize_page(mem_serialize_page); 4300 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page)); 4301 } 4302 4303 // Check and sets minimum stack sizes against command line options 4304 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 4305 return JNI_ERR; 4306 } 4307 4308 Solaris::libthread_init(); 4309 4310 if (UseNUMA) { 4311 if (!Solaris::liblgrp_init()) { 4312 UseNUMA = false; 4313 } else { 4314 size_t lgrp_limit = os::numa_get_groups_num(); 4315 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); 4316 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 4317 FREE_C_HEAP_ARRAY(int, lgrp_ids); 4318 if (lgrp_num < 2) { 4319 // There's only one locality group, disable NUMA. 4320 UseNUMA = false; 4321 } 4322 } 4323 if (!UseNUMA && ForceNUMA) { 4324 UseNUMA = true; 4325 } 4326 } 4327 4328 Solaris::signal_sets_init(); 4329 Solaris::init_signal_mem(); 4330 Solaris::install_signal_handlers(); 4331 4332 // initialize synchronization primitives to use either thread or 4333 // lwp synchronization (controlled by UseLWPSynchronization) 4334 Solaris::synchronization_init(); 4335 4336 if (MaxFDLimit) { 4337 // set the number of file descriptors to max. print out error 4338 // if getrlimit/setrlimit fails but continue regardless. 4339 struct rlimit nbr_files; 4340 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 4341 if (status != 0) { 4342 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 4343 } else { 4344 nbr_files.rlim_cur = nbr_files.rlim_max; 4345 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 4346 if (status != 0) { 4347 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 4348 } 4349 } 4350 } 4351 4352 // Calculate theoretical max. size of Threads to guard gainst 4353 // artifical out-of-memory situations, where all available address- 4354 // space has been reserved by thread stacks. Default stack size is 1Mb. 4355 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 4356 JavaThread::stack_size_at_create() : (1*K*K); 4357 assert(pre_thread_stack_size != 0, "Must have a stack"); 4358 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 4359 // we should start doing Virtual Memory banging. Currently when the threads will 4360 // have used all but 200Mb of space. 4361 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 4362 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 4363 4364 // at-exit methods are called in the reverse order of their registration. 4365 // In Solaris 7 and earlier, atexit functions are called on return from 4366 // main or as a result of a call to exit(3C). There can be only 32 of 4367 // these functions registered and atexit() does not set errno. In Solaris 4368 // 8 and later, there is no limit to the number of functions registered 4369 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 4370 // functions are called upon dlclose(3DL) in addition to return from main 4371 // and exit(3C). 4372 4373 if (PerfAllowAtExitRegistration) { 4374 // only register atexit functions if PerfAllowAtExitRegistration is set. 4375 // atexit functions can be delayed until process exit time, which 4376 // can be problematic for embedded VM situations. Embedded VMs should 4377 // call DestroyJavaVM() to assure that VM resources are released. 4378 4379 // note: perfMemory_exit_helper atexit function may be removed in 4380 // the future if the appropriate cleanup code can be added to the 4381 // VM_Exit VMOperation's doit method. 4382 if (atexit(perfMemory_exit_helper) != 0) { 4383 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 4384 } 4385 } 4386 4387 // Init pset_loadavg function pointer 4388 init_pset_getloadavg_ptr(); 4389 4390 return JNI_OK; 4391 } 4392 4393 // Mark the polling page as unreadable 4394 void os::make_polling_page_unreadable(void) { 4395 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) { 4396 fatal("Could not disable polling page"); 4397 } 4398 } 4399 4400 // Mark the polling page as readable 4401 void os::make_polling_page_readable(void) { 4402 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) { 4403 fatal("Could not enable polling page"); 4404 } 4405 } 4406 4407 // Is a (classpath) directory empty? 4408 bool os::dir_is_empty(const char* path) { 4409 DIR *dir = NULL; 4410 struct dirent *ptr; 4411 4412 dir = opendir(path); 4413 if (dir == NULL) return true; 4414 4415 // Scan the directory 4416 bool result = true; 4417 char buf[sizeof(struct dirent) + MAX_PATH]; 4418 struct dirent *dbuf = (struct dirent *) buf; 4419 while (result && (ptr = readdir(dir, dbuf)) != NULL) { 4420 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 4421 result = false; 4422 } 4423 } 4424 closedir(dir); 4425 return result; 4426 } 4427 4428 // This code originates from JDK's sysOpen and open64_w 4429 // from src/solaris/hpi/src/system_md.c 4430 4431 int os::open(const char *path, int oflag, int mode) { 4432 if (strlen(path) > MAX_PATH - 1) { 4433 errno = ENAMETOOLONG; 4434 return -1; 4435 } 4436 int fd; 4437 4438 fd = ::open64(path, oflag, mode); 4439 if (fd == -1) return -1; 4440 4441 // If the open succeeded, the file might still be a directory 4442 { 4443 struct stat64 buf64; 4444 int ret = ::fstat64(fd, &buf64); 4445 int st_mode = buf64.st_mode; 4446 4447 if (ret != -1) { 4448 if ((st_mode & S_IFMT) == S_IFDIR) { 4449 errno = EISDIR; 4450 ::close(fd); 4451 return -1; 4452 } 4453 } else { 4454 ::close(fd); 4455 return -1; 4456 } 4457 } 4458 4459 // 32-bit Solaris systems suffer from: 4460 // 4461 // - an historical default soft limit of 256 per-process file 4462 // descriptors that is too low for many Java programs. 4463 // 4464 // - a design flaw where file descriptors created using stdio 4465 // fopen must be less than 256, _even_ when the first limit above 4466 // has been raised. This can cause calls to fopen (but not calls to 4467 // open, for example) to fail mysteriously, perhaps in 3rd party 4468 // native code (although the JDK itself uses fopen). One can hardly 4469 // criticize them for using this most standard of all functions. 4470 // 4471 // We attempt to make everything work anyways by: 4472 // 4473 // - raising the soft limit on per-process file descriptors beyond 4474 // 256 4475 // 4476 // - As of Solaris 10u4, we can request that Solaris raise the 256 4477 // stdio fopen limit by calling function enable_extended_FILE_stdio. 4478 // This is done in init_2 and recorded in enabled_extended_FILE_stdio 4479 // 4480 // - If we are stuck on an old (pre 10u4) Solaris system, we can 4481 // workaround the bug by remapping non-stdio file descriptors below 4482 // 256 to ones beyond 256, which is done below. 4483 // 4484 // See: 4485 // 1085341: 32-bit stdio routines should support file descriptors >255 4486 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files 4487 // 6431278: Netbeans crash on 32 bit Solaris: need to call 4488 // enable_extended_FILE_stdio() in VM initialisation 4489 // Giri Mandalika's blog 4490 // http://technopark02.blogspot.com/2005_05_01_archive.html 4491 // 4492 #ifndef _LP64 4493 if ((!enabled_extended_FILE_stdio) && fd < 256) { 4494 int newfd = ::fcntl(fd, F_DUPFD, 256); 4495 if (newfd != -1) { 4496 ::close(fd); 4497 fd = newfd; 4498 } 4499 } 4500 #endif // 32-bit Solaris 4501 4502 // All file descriptors that are opened in the JVM and not 4503 // specifically destined for a subprocess should have the 4504 // close-on-exec flag set. If we don't set it, then careless 3rd 4505 // party native code might fork and exec without closing all 4506 // appropriate file descriptors (e.g. as we do in closeDescriptors in 4507 // UNIXProcess.c), and this in turn might: 4508 // 4509 // - cause end-of-file to fail to be detected on some file 4510 // descriptors, resulting in mysterious hangs, or 4511 // 4512 // - might cause an fopen in the subprocess to fail on a system 4513 // suffering from bug 1085341. 4514 // 4515 // (Yes, the default setting of the close-on-exec flag is a Unix 4516 // design flaw) 4517 // 4518 // See: 4519 // 1085341: 32-bit stdio routines should support file descriptors >255 4520 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 4521 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 4522 // 4523 #ifdef FD_CLOEXEC 4524 { 4525 int flags = ::fcntl(fd, F_GETFD); 4526 if (flags != -1) { 4527 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 4528 } 4529 } 4530 #endif 4531 4532 return fd; 4533 } 4534 4535 // create binary file, rewriting existing file if required 4536 int os::create_binary_file(const char* path, bool rewrite_existing) { 4537 int oflags = O_WRONLY | O_CREAT; 4538 if (!rewrite_existing) { 4539 oflags |= O_EXCL; 4540 } 4541 return ::open64(path, oflags, S_IREAD | S_IWRITE); 4542 } 4543 4544 // return current position of file pointer 4545 jlong os::current_file_offset(int fd) { 4546 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 4547 } 4548 4549 // move file pointer to the specified offset 4550 jlong os::seek_to_file_offset(int fd, jlong offset) { 4551 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 4552 } 4553 4554 jlong os::lseek(int fd, jlong offset, int whence) { 4555 return (jlong) ::lseek64(fd, offset, whence); 4556 } 4557 4558 char * os::native_path(char *path) { 4559 return path; 4560 } 4561 4562 int os::ftruncate(int fd, jlong length) { 4563 return ::ftruncate64(fd, length); 4564 } 4565 4566 int os::fsync(int fd) { 4567 RESTARTABLE_RETURN_INT(::fsync(fd)); 4568 } 4569 4570 int os::available(int fd, jlong *bytes) { 4571 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 4572 "Assumed _thread_in_native"); 4573 jlong cur, end; 4574 int mode; 4575 struct stat64 buf64; 4576 4577 if (::fstat64(fd, &buf64) >= 0) { 4578 mode = buf64.st_mode; 4579 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 4580 int n,ioctl_return; 4581 4582 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return); 4583 if (ioctl_return>= 0) { 4584 *bytes = n; 4585 return 1; 4586 } 4587 } 4588 } 4589 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 4590 return 0; 4591 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 4592 return 0; 4593 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 4594 return 0; 4595 } 4596 *bytes = end - cur; 4597 return 1; 4598 } 4599 4600 // Map a block of memory. 4601 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4602 char *addr, size_t bytes, bool read_only, 4603 bool allow_exec) { 4604 int prot; 4605 int flags; 4606 4607 if (read_only) { 4608 prot = PROT_READ; 4609 flags = MAP_SHARED; 4610 } else { 4611 prot = PROT_READ | PROT_WRITE; 4612 flags = MAP_PRIVATE; 4613 } 4614 4615 if (allow_exec) { 4616 prot |= PROT_EXEC; 4617 } 4618 4619 if (addr != NULL) { 4620 flags |= MAP_FIXED; 4621 } 4622 4623 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 4624 fd, file_offset); 4625 if (mapped_address == MAP_FAILED) { 4626 return NULL; 4627 } 4628 return mapped_address; 4629 } 4630 4631 4632 // Remap a block of memory. 4633 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4634 char *addr, size_t bytes, bool read_only, 4635 bool allow_exec) { 4636 // same as map_memory() on this OS 4637 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4638 allow_exec); 4639 } 4640 4641 4642 // Unmap a block of memory. 4643 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4644 return munmap(addr, bytes) == 0; 4645 } 4646 4647 void os::pause() { 4648 char filename[MAX_PATH]; 4649 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4650 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4651 } else { 4652 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4653 } 4654 4655 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4656 if (fd != -1) { 4657 struct stat buf; 4658 ::close(fd); 4659 while (::stat(filename, &buf) == 0) { 4660 (void)::poll(NULL, 0, 100); 4661 } 4662 } else { 4663 jio_fprintf(stderr, 4664 "Could not open pause file '%s', continuing immediately.\n", filename); 4665 } 4666 } 4667 4668 #ifndef PRODUCT 4669 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4670 // Turn this on if you need to trace synch operations. 4671 // Set RECORD_SYNCH_LIMIT to a large-enough value, 4672 // and call record_synch_enable and record_synch_disable 4673 // around the computation of interest. 4674 4675 void record_synch(char* name, bool returning); // defined below 4676 4677 class RecordSynch { 4678 char* _name; 4679 public: 4680 RecordSynch(char* name) :_name(name) { record_synch(_name, false); } 4681 ~RecordSynch() { record_synch(_name, true); } 4682 }; 4683 4684 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 4685 extern "C" ret name params { \ 4686 typedef ret name##_t params; \ 4687 static name##_t* implem = NULL; \ 4688 static int callcount = 0; \ 4689 if (implem == NULL) { \ 4690 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 4691 if (implem == NULL) fatal(dlerror()); \ 4692 } \ 4693 ++callcount; \ 4694 RecordSynch _rs(#name); \ 4695 inner; \ 4696 return implem args; \ 4697 } 4698 // in dbx, examine callcounts this way: 4699 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 4700 4701 #define CHECK_POINTER_OK(p) \ 4702 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) 4703 #define CHECK_MU \ 4704 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 4705 #define CHECK_CV \ 4706 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 4707 #define CHECK_P(p) \ 4708 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 4709 4710 #define CHECK_MUTEX(mutex_op) \ 4711 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 4712 4713 CHECK_MUTEX( mutex_lock) 4714 CHECK_MUTEX( _mutex_lock) 4715 CHECK_MUTEX( mutex_unlock) 4716 CHECK_MUTEX(_mutex_unlock) 4717 CHECK_MUTEX( mutex_trylock) 4718 CHECK_MUTEX(_mutex_trylock) 4719 4720 #define CHECK_COND(cond_op) \ 4721 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV); 4722 4723 CHECK_COND( cond_wait); 4724 CHECK_COND(_cond_wait); 4725 CHECK_COND(_cond_wait_cancel); 4726 4727 #define CHECK_COND2(cond_op) \ 4728 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV); 4729 4730 CHECK_COND2( cond_timedwait); 4731 CHECK_COND2(_cond_timedwait); 4732 CHECK_COND2(_cond_timedwait_cancel); 4733 4734 // do the _lwp_* versions too 4735 #define mutex_t lwp_mutex_t 4736 #define cond_t lwp_cond_t 4737 CHECK_MUTEX( _lwp_mutex_lock) 4738 CHECK_MUTEX( _lwp_mutex_unlock) 4739 CHECK_MUTEX( _lwp_mutex_trylock) 4740 CHECK_MUTEX( __lwp_mutex_lock) 4741 CHECK_MUTEX( __lwp_mutex_unlock) 4742 CHECK_MUTEX( __lwp_mutex_trylock) 4743 CHECK_MUTEX(___lwp_mutex_lock) 4744 CHECK_MUTEX(___lwp_mutex_unlock) 4745 4746 CHECK_COND( _lwp_cond_wait); 4747 CHECK_COND( __lwp_cond_wait); 4748 CHECK_COND(___lwp_cond_wait); 4749 4750 CHECK_COND2( _lwp_cond_timedwait); 4751 CHECK_COND2( __lwp_cond_timedwait); 4752 #undef mutex_t 4753 #undef cond_t 4754 4755 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4756 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4757 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 4758 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 4759 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4760 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4761 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4762 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4763 4764 4765 // recording machinery: 4766 4767 enum { RECORD_SYNCH_LIMIT = 200 }; 4768 char* record_synch_name[RECORD_SYNCH_LIMIT]; 4769 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 4770 bool record_synch_returning[RECORD_SYNCH_LIMIT]; 4771 thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 4772 int record_synch_count = 0; 4773 bool record_synch_enabled = false; 4774 4775 // in dbx, examine recorded data this way: 4776 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 4777 4778 void record_synch(char* name, bool returning) { 4779 if (record_synch_enabled) { 4780 if (record_synch_count < RECORD_SYNCH_LIMIT) { 4781 record_synch_name[record_synch_count] = name; 4782 record_synch_returning[record_synch_count] = returning; 4783 record_synch_thread[record_synch_count] = thr_self(); 4784 record_synch_arg0ptr[record_synch_count] = &name; 4785 record_synch_count++; 4786 } 4787 // put more checking code here: 4788 // ... 4789 } 4790 } 4791 4792 void record_synch_enable() { 4793 // start collecting trace data, if not already doing so 4794 if (!record_synch_enabled) record_synch_count = 0; 4795 record_synch_enabled = true; 4796 } 4797 4798 void record_synch_disable() { 4799 // stop collecting trace data 4800 record_synch_enabled = false; 4801 } 4802 4803 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4804 #endif // PRODUCT 4805 4806 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4807 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 4808 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4809 4810 4811 // JVMTI & JVM monitoring and management support 4812 // The thread_cpu_time() and current_thread_cpu_time() are only 4813 // supported if is_thread_cpu_time_supported() returns true. 4814 // They are not supported on Solaris T1. 4815 4816 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4817 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4818 // of a thread. 4819 // 4820 // current_thread_cpu_time() and thread_cpu_time(Thread *) 4821 // returns the fast estimate available on the platform. 4822 4823 // hrtime_t gethrvtime() return value includes 4824 // user time but does not include system time 4825 jlong os::current_thread_cpu_time() { 4826 return (jlong) gethrvtime(); 4827 } 4828 4829 jlong os::thread_cpu_time(Thread *thread) { 4830 // return user level CPU time only to be consistent with 4831 // what current_thread_cpu_time returns. 4832 // thread_cpu_time_info() must be changed if this changes 4833 return os::thread_cpu_time(thread, false /* user time only */); 4834 } 4835 4836 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4837 if (user_sys_cpu_time) { 4838 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4839 } else { 4840 return os::current_thread_cpu_time(); 4841 } 4842 } 4843 4844 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 4845 char proc_name[64]; 4846 int count; 4847 prusage_t prusage; 4848 jlong lwp_time; 4849 int fd; 4850 4851 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 4852 getpid(), 4853 thread->osthread()->lwp_id()); 4854 fd = ::open(proc_name, O_RDONLY); 4855 if (fd == -1) return -1; 4856 4857 do { 4858 count = ::pread(fd, 4859 (void *)&prusage.pr_utime, 4860 thr_time_size, 4861 thr_time_off); 4862 } while (count < 0 && errno == EINTR); 4863 ::close(fd); 4864 if (count < 0) return -1; 4865 4866 if (user_sys_cpu_time) { 4867 // user + system CPU time 4868 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 4869 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 4870 (jlong)prusage.pr_stime.tv_nsec + 4871 (jlong)prusage.pr_utime.tv_nsec; 4872 } else { 4873 // user level CPU time only 4874 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 4875 (jlong)prusage.pr_utime.tv_nsec; 4876 } 4877 4878 return (lwp_time); 4879 } 4880 4881 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4882 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4883 info_ptr->may_skip_backward = false; // elapsed time not wall time 4884 info_ptr->may_skip_forward = false; // elapsed time not wall time 4885 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4886 } 4887 4888 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4889 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4890 info_ptr->may_skip_backward = false; // elapsed time not wall time 4891 info_ptr->may_skip_forward = false; // elapsed time not wall time 4892 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4893 } 4894 4895 bool os::is_thread_cpu_time_supported() { 4896 return true; 4897 } 4898 4899 // System loadavg support. Returns -1 if load average cannot be obtained. 4900 // Return the load average for our processor set if the primitive exists 4901 // (Solaris 9 and later). Otherwise just return system wide loadavg. 4902 int os::loadavg(double loadavg[], int nelem) { 4903 if (pset_getloadavg_ptr != NULL) { 4904 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 4905 } else { 4906 return ::getloadavg(loadavg, nelem); 4907 } 4908 } 4909 4910 //--------------------------------------------------------------------------------- 4911 4912 bool os::find(address addr, outputStream* st) { 4913 Dl_info dlinfo; 4914 memset(&dlinfo, 0, sizeof(dlinfo)); 4915 if (dladdr(addr, &dlinfo) != 0) { 4916 st->print(PTR_FORMAT ": ", addr); 4917 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 4918 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 4919 } else if (dlinfo.dli_fbase != NULL) { 4920 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 4921 } else { 4922 st->print("<absolute address>"); 4923 } 4924 if (dlinfo.dli_fname != NULL) { 4925 st->print(" in %s", dlinfo.dli_fname); 4926 } 4927 if (dlinfo.dli_fbase != NULL) { 4928 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 4929 } 4930 st->cr(); 4931 4932 if (Verbose) { 4933 // decode some bytes around the PC 4934 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 4935 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 4936 address lowest = (address) dlinfo.dli_sname; 4937 if (!lowest) lowest = (address) dlinfo.dli_fbase; 4938 if (begin < lowest) begin = lowest; 4939 Dl_info dlinfo2; 4940 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 4941 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 4942 end = (address) dlinfo2.dli_saddr; 4943 } 4944 Disassembler::decode(begin, end, st); 4945 } 4946 return true; 4947 } 4948 return false; 4949 } 4950 4951 // Following function has been added to support HotSparc's libjvm.so running 4952 // under Solaris production JDK 1.2.2 / 1.3.0. These came from 4953 // src/solaris/hpi/native_threads in the EVM codebase. 4954 // 4955 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 4956 // libraries and should thus be removed. We will leave it behind for a while 4957 // until we no longer want to able to run on top of 1.3.0 Solaris production 4958 // JDK. See 4341971. 4959 4960 #define STACK_SLACK 0x800 4961 4962 extern "C" { 4963 intptr_t sysThreadAvailableStackWithSlack() { 4964 stack_t st; 4965 intptr_t retval, stack_top; 4966 retval = thr_stksegment(&st); 4967 assert(retval == 0, "incorrect return value from thr_stksegment"); 4968 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 4969 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 4970 stack_top=(intptr_t)st.ss_sp-st.ss_size; 4971 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 4972 } 4973 } 4974 4975 // ObjectMonitor park-unpark infrastructure ... 4976 // 4977 // We implement Solaris and Linux PlatformEvents with the 4978 // obvious condvar-mutex-flag triple. 4979 // Another alternative that works quite well is pipes: 4980 // Each PlatformEvent consists of a pipe-pair. 4981 // The thread associated with the PlatformEvent 4982 // calls park(), which reads from the input end of the pipe. 4983 // Unpark() writes into the other end of the pipe. 4984 // The write-side of the pipe must be set NDELAY. 4985 // Unfortunately pipes consume a large # of handles. 4986 // Native solaris lwp_park() and lwp_unpark() work nicely, too. 4987 // Using pipes for the 1st few threads might be workable, however. 4988 // 4989 // park() is permitted to return spuriously. 4990 // Callers of park() should wrap the call to park() in 4991 // an appropriate loop. A litmus test for the correct 4992 // usage of park is the following: if park() were modified 4993 // to immediately return 0 your code should still work, 4994 // albeit degenerating to a spin loop. 4995 // 4996 // In a sense, park()-unpark() just provides more polite spinning 4997 // and polling with the key difference over naive spinning being 4998 // that a parked thread needs to be explicitly unparked() in order 4999 // to wake up and to poll the underlying condition. 5000 // 5001 // Assumption: 5002 // Only one parker can exist on an event, which is why we allocate 5003 // them per-thread. Multiple unparkers can coexist. 5004 // 5005 // _Event transitions in park() 5006 // -1 => -1 : illegal 5007 // 1 => 0 : pass - return immediately 5008 // 0 => -1 : block; then set _Event to 0 before returning 5009 // 5010 // _Event transitions in unpark() 5011 // 0 => 1 : just return 5012 // 1 => 1 : just return 5013 // -1 => either 0 or 1; must signal target thread 5014 // That is, we can safely transition _Event from -1 to either 5015 // 0 or 1. 5016 // 5017 // _Event serves as a restricted-range semaphore. 5018 // -1 : thread is blocked, i.e. there is a waiter 5019 // 0 : neutral: thread is running or ready, 5020 // could have been signaled after a wait started 5021 // 1 : signaled - thread is running or ready 5022 // 5023 // Another possible encoding of _Event would be with 5024 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5025 // 5026 // TODO-FIXME: add DTRACE probes for: 5027 // 1. Tx parks 5028 // 2. Ty unparks Tx 5029 // 3. Tx resumes from park 5030 5031 5032 // value determined through experimentation 5033 #define ROUNDINGFIX 11 5034 5035 // utility to compute the abstime argument to timedwait. 5036 // TODO-FIXME: switch from compute_abstime() to unpackTime(). 5037 5038 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 5039 // millis is the relative timeout time 5040 // abstime will be the absolute timeout time 5041 if (millis < 0) millis = 0; 5042 struct timeval now; 5043 int status = gettimeofday(&now, NULL); 5044 assert(status == 0, "gettimeofday"); 5045 jlong seconds = millis / 1000; 5046 jlong max_wait_period; 5047 5048 if (UseLWPSynchronization) { 5049 // forward port of fix for 4275818 (not sleeping long enough) 5050 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 5051 // _lwp_cond_timedwait() used a round_down algorithm rather 5052 // than a round_up. For millis less than our roundfactor 5053 // it rounded down to 0 which doesn't meet the spec. 5054 // For millis > roundfactor we may return a bit sooner, but 5055 // since we can not accurately identify the patch level and 5056 // this has already been fixed in Solaris 9 and 8 we will 5057 // leave it alone rather than always rounding down. 5058 5059 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 5060 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 5061 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 5062 max_wait_period = 21000000; 5063 } else { 5064 max_wait_period = 50000000; 5065 } 5066 millis %= 1000; 5067 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 5068 seconds = max_wait_period; 5069 } 5070 abstime->tv_sec = now.tv_sec + seconds; 5071 long usec = now.tv_usec + millis * 1000; 5072 if (usec >= 1000000) { 5073 abstime->tv_sec += 1; 5074 usec -= 1000000; 5075 } 5076 abstime->tv_nsec = usec * 1000; 5077 return abstime; 5078 } 5079 5080 void os::PlatformEvent::park() { // AKA: down() 5081 // Transitions for _Event: 5082 // -1 => -1 : illegal 5083 // 1 => 0 : pass - return immediately 5084 // 0 => -1 : block; then set _Event to 0 before returning 5085 5086 // Invariant: Only the thread associated with the Event/PlatformEvent 5087 // may call park(). 5088 assert(_nParked == 0, "invariant"); 5089 5090 int v; 5091 for (;;) { 5092 v = _Event; 5093 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5094 } 5095 guarantee(v >= 0, "invariant"); 5096 if (v == 0) { 5097 // Do this the hard way by blocking ... 5098 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5099 int status = os::Solaris::mutex_lock(_mutex); 5100 assert_status(status == 0, status, "mutex_lock"); 5101 guarantee(_nParked == 0, "invariant"); 5102 ++_nParked; 5103 while (_Event < 0) { 5104 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 5105 // Treat this the same as if the wait was interrupted 5106 // With usr/lib/lwp going to kernel, always handle ETIME 5107 status = os::Solaris::cond_wait(_cond, _mutex); 5108 if (status == ETIME) status = EINTR; 5109 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 5110 } 5111 --_nParked; 5112 _Event = 0; 5113 status = os::Solaris::mutex_unlock(_mutex); 5114 assert_status(status == 0, status, "mutex_unlock"); 5115 // Paranoia to ensure our locked and lock-free paths interact 5116 // correctly with each other. 5117 OrderAccess::fence(); 5118 } 5119 } 5120 5121 int os::PlatformEvent::park(jlong millis) { 5122 // Transitions for _Event: 5123 // -1 => -1 : illegal 5124 // 1 => 0 : pass - return immediately 5125 // 0 => -1 : block; then set _Event to 0 before returning 5126 5127 guarantee(_nParked == 0, "invariant"); 5128 int v; 5129 for (;;) { 5130 v = _Event; 5131 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5132 } 5133 guarantee(v >= 0, "invariant"); 5134 if (v != 0) return OS_OK; 5135 5136 int ret = OS_TIMEOUT; 5137 timestruc_t abst; 5138 compute_abstime(&abst, millis); 5139 5140 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5141 int status = os::Solaris::mutex_lock(_mutex); 5142 assert_status(status == 0, status, "mutex_lock"); 5143 guarantee(_nParked == 0, "invariant"); 5144 ++_nParked; 5145 while (_Event < 0) { 5146 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 5147 assert_status(status == 0 || status == EINTR || 5148 status == ETIME || status == ETIMEDOUT, 5149 status, "cond_timedwait"); 5150 if (!FilterSpuriousWakeups) break; // previous semantics 5151 if (status == ETIME || status == ETIMEDOUT) break; 5152 // We consume and ignore EINTR and spurious wakeups. 5153 } 5154 --_nParked; 5155 if (_Event >= 0) ret = OS_OK; 5156 _Event = 0; 5157 status = os::Solaris::mutex_unlock(_mutex); 5158 assert_status(status == 0, status, "mutex_unlock"); 5159 // Paranoia to ensure our locked and lock-free paths interact 5160 // correctly with each other. 5161 OrderAccess::fence(); 5162 return ret; 5163 } 5164 5165 void os::PlatformEvent::unpark() { 5166 // Transitions for _Event: 5167 // 0 => 1 : just return 5168 // 1 => 1 : just return 5169 // -1 => either 0 or 1; must signal target thread 5170 // That is, we can safely transition _Event from -1 to either 5171 // 0 or 1. 5172 // See also: "Semaphores in Plan 9" by Mullender & Cox 5173 // 5174 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5175 // that it will take two back-to-back park() calls for the owning 5176 // thread to block. This has the benefit of forcing a spurious return 5177 // from the first park() call after an unpark() call which will help 5178 // shake out uses of park() and unpark() without condition variables. 5179 5180 if (Atomic::xchg(1, &_Event) >= 0) return; 5181 5182 // If the thread associated with the event was parked, wake it. 5183 // Wait for the thread assoc with the PlatformEvent to vacate. 5184 int status = os::Solaris::mutex_lock(_mutex); 5185 assert_status(status == 0, status, "mutex_lock"); 5186 int AnyWaiters = _nParked; 5187 status = os::Solaris::mutex_unlock(_mutex); 5188 assert_status(status == 0, status, "mutex_unlock"); 5189 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 5190 if (AnyWaiters != 0) { 5191 // Note that we signal() *after* dropping the lock for "immortal" Events. 5192 // This is safe and avoids a common class of futile wakeups. In rare 5193 // circumstances this can cause a thread to return prematurely from 5194 // cond_{timed}wait() but the spurious wakeup is benign and the victim 5195 // will simply re-test the condition and re-park itself. 5196 // This provides particular benefit if the underlying platform does not 5197 // provide wait morphing. 5198 status = os::Solaris::cond_signal(_cond); 5199 assert_status(status == 0, status, "cond_signal"); 5200 } 5201 } 5202 5203 // JSR166 5204 // ------------------------------------------------------- 5205 5206 // The solaris and linux implementations of park/unpark are fairly 5207 // conservative for now, but can be improved. They currently use a 5208 // mutex/condvar pair, plus _counter. 5209 // Park decrements _counter if > 0, else does a condvar wait. Unpark 5210 // sets count to 1 and signals condvar. Only one thread ever waits 5211 // on the condvar. Contention seen when trying to park implies that someone 5212 // is unparking you, so don't wait. And spurious returns are fine, so there 5213 // is no need to track notifications. 5214 5215 #define MAX_SECS 100000000 5216 5217 // This code is common to linux and solaris and will be moved to a 5218 // common place in dolphin. 5219 // 5220 // The passed in time value is either a relative time in nanoseconds 5221 // or an absolute time in milliseconds. Either way it has to be unpacked 5222 // into suitable seconds and nanoseconds components and stored in the 5223 // given timespec structure. 5224 // Given time is a 64-bit value and the time_t used in the timespec is only 5225 // a signed-32-bit value (except on 64-bit Linux) we have to watch for 5226 // overflow if times way in the future are given. Further on Solaris versions 5227 // prior to 10 there is a restriction (see cond_timedwait) that the specified 5228 // number of seconds, in abstime, is less than current_time + 100,000,000. 5229 // As it will be 28 years before "now + 100000000" will overflow we can 5230 // ignore overflow and just impose a hard-limit on seconds using the value 5231 // of "now + 100,000,000". This places a limit on the timeout of about 3.17 5232 // years from "now". 5233 // 5234 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 5235 assert(time > 0, "convertTime"); 5236 5237 struct timeval now; 5238 int status = gettimeofday(&now, NULL); 5239 assert(status == 0, "gettimeofday"); 5240 5241 time_t max_secs = now.tv_sec + MAX_SECS; 5242 5243 if (isAbsolute) { 5244 jlong secs = time / 1000; 5245 if (secs > max_secs) { 5246 absTime->tv_sec = max_secs; 5247 } else { 5248 absTime->tv_sec = secs; 5249 } 5250 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 5251 } else { 5252 jlong secs = time / NANOSECS_PER_SEC; 5253 if (secs >= MAX_SECS) { 5254 absTime->tv_sec = max_secs; 5255 absTime->tv_nsec = 0; 5256 } else { 5257 absTime->tv_sec = now.tv_sec + secs; 5258 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 5259 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 5260 absTime->tv_nsec -= NANOSECS_PER_SEC; 5261 ++absTime->tv_sec; // note: this must be <= max_secs 5262 } 5263 } 5264 } 5265 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 5266 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 5267 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 5268 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 5269 } 5270 5271 void Parker::park(bool isAbsolute, jlong time) { 5272 // Ideally we'd do something useful while spinning, such 5273 // as calling unpackTime(). 5274 5275 // Optional fast-path check: 5276 // Return immediately if a permit is available. 5277 // We depend on Atomic::xchg() having full barrier semantics 5278 // since we are doing a lock-free update to _counter. 5279 if (Atomic::xchg(0, &_counter) > 0) return; 5280 5281 // Optional fast-exit: Check interrupt before trying to wait 5282 Thread* thread = Thread::current(); 5283 assert(thread->is_Java_thread(), "Must be JavaThread"); 5284 JavaThread *jt = (JavaThread *)thread; 5285 if (Thread::is_interrupted(thread, false)) { 5286 return; 5287 } 5288 5289 // First, demultiplex/decode time arguments 5290 timespec absTime; 5291 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all 5292 return; 5293 } 5294 if (time > 0) { 5295 // Warning: this code might be exposed to the old Solaris time 5296 // round-down bugs. Grep "roundingFix" for details. 5297 unpackTime(&absTime, isAbsolute, time); 5298 } 5299 5300 // Enter safepoint region 5301 // Beware of deadlocks such as 6317397. 5302 // The per-thread Parker:: _mutex is a classic leaf-lock. 5303 // In particular a thread must never block on the Threads_lock while 5304 // holding the Parker:: mutex. If safepoints are pending both the 5305 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 5306 ThreadBlockInVM tbivm(jt); 5307 5308 // Don't wait if cannot get lock since interference arises from 5309 // unblocking. Also. check interrupt before trying wait 5310 if (Thread::is_interrupted(thread, false) || 5311 os::Solaris::mutex_trylock(_mutex) != 0) { 5312 return; 5313 } 5314 5315 int status; 5316 5317 if (_counter > 0) { // no wait needed 5318 _counter = 0; 5319 status = os::Solaris::mutex_unlock(_mutex); 5320 assert(status == 0, "invariant"); 5321 // Paranoia to ensure our locked and lock-free paths interact 5322 // correctly with each other and Java-level accesses. 5323 OrderAccess::fence(); 5324 return; 5325 } 5326 5327 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5328 jt->set_suspend_equivalent(); 5329 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 5330 5331 // Do this the hard way by blocking ... 5332 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5333 if (time == 0) { 5334 status = os::Solaris::cond_wait(_cond, _mutex); 5335 } else { 5336 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 5337 } 5338 // Note that an untimed cond_wait() can sometimes return ETIME on older 5339 // versions of the Solaris. 5340 assert_status(status == 0 || status == EINTR || 5341 status == ETIME || status == ETIMEDOUT, 5342 status, "cond_timedwait"); 5343 5344 _counter = 0; 5345 status = os::Solaris::mutex_unlock(_mutex); 5346 assert_status(status == 0, status, "mutex_unlock"); 5347 // Paranoia to ensure our locked and lock-free paths interact 5348 // correctly with each other and Java-level accesses. 5349 OrderAccess::fence(); 5350 5351 // If externally suspended while waiting, re-suspend 5352 if (jt->handle_special_suspend_equivalent_condition()) { 5353 jt->java_suspend_self(); 5354 } 5355 } 5356 5357 void Parker::unpark() { 5358 int status = os::Solaris::mutex_lock(_mutex); 5359 assert(status == 0, "invariant"); 5360 const int s = _counter; 5361 _counter = 1; 5362 status = os::Solaris::mutex_unlock(_mutex); 5363 assert(status == 0, "invariant"); 5364 5365 if (s < 1) { 5366 status = os::Solaris::cond_signal(_cond); 5367 assert(status == 0, "invariant"); 5368 } 5369 } 5370 5371 extern char** environ; 5372 5373 // Run the specified command in a separate process. Return its exit value, 5374 // or -1 on failure (e.g. can't fork a new process). 5375 // Unlike system(), this function can be called from signal handler. It 5376 // doesn't block SIGINT et al. 5377 int os::fork_and_exec(char* cmd) { 5378 char * argv[4]; 5379 argv[0] = (char *)"sh"; 5380 argv[1] = (char *)"-c"; 5381 argv[2] = cmd; 5382 argv[3] = NULL; 5383 5384 // fork is async-safe, fork1 is not so can't use in signal handler 5385 pid_t pid; 5386 Thread* t = Thread::current_or_null_safe(); 5387 if (t != NULL && t->is_inside_signal_handler()) { 5388 pid = fork(); 5389 } else { 5390 pid = fork1(); 5391 } 5392 5393 if (pid < 0) { 5394 // fork failed 5395 warning("fork failed: %s", os::strerror(errno)); 5396 return -1; 5397 5398 } else if (pid == 0) { 5399 // child process 5400 5401 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 5402 execve("/usr/bin/sh", argv, environ); 5403 5404 // execve failed 5405 _exit(-1); 5406 5407 } else { 5408 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5409 // care about the actual exit code, for now. 5410 5411 int status; 5412 5413 // Wait for the child process to exit. This returns immediately if 5414 // the child has already exited. */ 5415 while (waitpid(pid, &status, 0) < 0) { 5416 switch (errno) { 5417 case ECHILD: return 0; 5418 case EINTR: break; 5419 default: return -1; 5420 } 5421 } 5422 5423 if (WIFEXITED(status)) { 5424 // The child exited normally; get its exit code. 5425 return WEXITSTATUS(status); 5426 } else if (WIFSIGNALED(status)) { 5427 // The child exited because of a signal 5428 // The best value to return is 0x80 + signal number, 5429 // because that is what all Unix shells do, and because 5430 // it allows callers to distinguish between process exit and 5431 // process death by signal. 5432 return 0x80 + WTERMSIG(status); 5433 } else { 5434 // Unknown exit code; pass it through 5435 return status; 5436 } 5437 } 5438 } 5439 5440 // is_headless_jre() 5441 // 5442 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 5443 // in order to report if we are running in a headless jre 5444 // 5445 // Since JDK8 xawt/libmawt.so was moved into the same directory 5446 // as libawt.so, and renamed libawt_xawt.so 5447 // 5448 bool os::is_headless_jre() { 5449 struct stat statbuf; 5450 char buf[MAXPATHLEN]; 5451 char libmawtpath[MAXPATHLEN]; 5452 const char *xawtstr = "/xawt/libmawt.so"; 5453 const char *new_xawtstr = "/libawt_xawt.so"; 5454 char *p; 5455 5456 // Get path to libjvm.so 5457 os::jvm_path(buf, sizeof(buf)); 5458 5459 // Get rid of libjvm.so 5460 p = strrchr(buf, '/'); 5461 if (p == NULL) { 5462 return false; 5463 } else { 5464 *p = '\0'; 5465 } 5466 5467 // Get rid of client or server 5468 p = strrchr(buf, '/'); 5469 if (p == NULL) { 5470 return false; 5471 } else { 5472 *p = '\0'; 5473 } 5474 5475 // check xawt/libmawt.so 5476 strcpy(libmawtpath, buf); 5477 strcat(libmawtpath, xawtstr); 5478 if (::stat(libmawtpath, &statbuf) == 0) return false; 5479 5480 // check libawt_xawt.so 5481 strcpy(libmawtpath, buf); 5482 strcat(libmawtpath, new_xawtstr); 5483 if (::stat(libmawtpath, &statbuf) == 0) return false; 5484 5485 return true; 5486 } 5487 5488 size_t os::write(int fd, const void *buf, unsigned int nBytes) { 5489 size_t res; 5490 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res); 5491 return res; 5492 } 5493 5494 int os::close(int fd) { 5495 return ::close(fd); 5496 } 5497 5498 int os::socket_close(int fd) { 5499 return ::close(fd); 5500 } 5501 5502 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5503 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5504 "Assumed _thread_in_native"); 5505 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags)); 5506 } 5507 5508 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5509 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5510 "Assumed _thread_in_native"); 5511 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5512 } 5513 5514 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5515 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5516 } 5517 5518 // As both poll and select can be interrupted by signals, we have to be 5519 // prepared to restart the system call after updating the timeout, unless 5520 // a poll() is done with timeout == -1, in which case we repeat with this 5521 // "wait forever" value. 5522 5523 int os::connect(int fd, struct sockaddr *him, socklen_t len) { 5524 int _result; 5525 _result = ::connect(fd, him, len); 5526 5527 // On Solaris, when a connect() call is interrupted, the connection 5528 // can be established asynchronously (see 6343810). Subsequent calls 5529 // to connect() must check the errno value which has the semantic 5530 // described below (copied from the connect() man page). Handling 5531 // of asynchronously established connections is required for both 5532 // blocking and non-blocking sockets. 5533 // EINTR The connection attempt was interrupted 5534 // before any data arrived by the delivery of 5535 // a signal. The connection, however, will be 5536 // established asynchronously. 5537 // 5538 // EINPROGRESS The socket is non-blocking, and the connec- 5539 // tion cannot be completed immediately. 5540 // 5541 // EALREADY The socket is non-blocking, and a previous 5542 // connection attempt has not yet been com- 5543 // pleted. 5544 // 5545 // EISCONN The socket is already connected. 5546 if (_result == OS_ERR && errno == EINTR) { 5547 // restarting a connect() changes its errno semantics 5548 RESTARTABLE(::connect(fd, him, len), _result); 5549 // undo these changes 5550 if (_result == OS_ERR) { 5551 if (errno == EALREADY) { 5552 errno = EINPROGRESS; // fall through 5553 } else if (errno == EISCONN) { 5554 errno = 0; 5555 return OS_OK; 5556 } 5557 } 5558 } 5559 return _result; 5560 } 5561 5562 // Get the default path to the core file 5563 // Returns the length of the string 5564 int os::get_core_path(char* buffer, size_t bufferSize) { 5565 const char* p = get_current_directory(buffer, bufferSize); 5566 5567 if (p == NULL) { 5568 assert(p != NULL, "failed to get current directory"); 5569 return 0; 5570 } 5571 5572 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 5573 p, current_process_id()); 5574 5575 return strlen(buffer); 5576 } 5577 5578 #ifndef PRODUCT 5579 void TestReserveMemorySpecial_test() { 5580 // No tests available for this platform 5581 } 5582 #endif 5583 5584 bool os::start_debugging(char *buf, int buflen) { 5585 int len = (int)strlen(buf); 5586 char *p = &buf[len]; 5587 5588 jio_snprintf(p, buflen-len, 5589 "\n\n" 5590 "Do you want to debug the problem?\n\n" 5591 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n" 5592 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 5593 "Otherwise, press RETURN to abort...", 5594 os::current_process_id(), os::current_thread_id()); 5595 5596 bool yes = os::message_box("Unexpected Error", buf); 5597 5598 if (yes) { 5599 // yes, user asked VM to launch debugger 5600 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id()); 5601 5602 os::fork_and_exec(buf); 5603 yes = false; 5604 } 5605 return yes; 5606 }