1 /* 2 * Copyright (c) 1997, 2016, 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/decoder.hpp" 68 #include "utilities/defaultStream.hpp" 69 #include "utilities/events.hpp" 70 #include "utilities/growableArray.hpp" 71 #include "utilities/macros.hpp" 72 #include "utilities/vmError.hpp" 73 74 // put OS-includes here 75 # include <dlfcn.h> 76 # include <errno.h> 77 # include <exception> 78 # include <link.h> 79 # include <poll.h> 80 # include <pthread.h> 81 # include <schedctl.h> 82 # include <setjmp.h> 83 # include <signal.h> 84 # include <stdio.h> 85 # include <alloca.h> 86 # include <sys/filio.h> 87 # include <sys/ipc.h> 88 # include <sys/lwp.h> 89 # include <sys/machelf.h> // for elf Sym structure used by dladdr1 90 # include <sys/mman.h> 91 # include <sys/processor.h> 92 # include <sys/procset.h> 93 # include <sys/pset.h> 94 # include <sys/resource.h> 95 # include <sys/shm.h> 96 # include <sys/socket.h> 97 # include <sys/stat.h> 98 # include <sys/systeminfo.h> 99 # include <sys/time.h> 100 # include <sys/times.h> 101 # include <sys/types.h> 102 # include <sys/wait.h> 103 # include <sys/utsname.h> 104 # include <thread.h> 105 # include <unistd.h> 106 # include <sys/priocntl.h> 107 # include <sys/rtpriocntl.h> 108 # include <sys/tspriocntl.h> 109 # include <sys/iapriocntl.h> 110 # include <sys/fxpriocntl.h> 111 # include <sys/loadavg.h> 112 # include <string.h> 113 # include <stdio.h> 114 115 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 116 # include <sys/procfs.h> // see comment in <sys/procfs.h> 117 118 #define MAX_PATH (2 * K) 119 120 // for timer info max values which include all bits 121 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 122 123 124 // Here are some liblgrp types from sys/lgrp_user.h to be able to 125 // compile on older systems without this header file. 126 127 #ifndef MADV_ACCESS_LWP 128 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */ 129 #endif 130 #ifndef MADV_ACCESS_MANY 131 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */ 132 #endif 133 134 #ifndef LGRP_RSRC_CPU 135 #define LGRP_RSRC_CPU 0 /* CPU resources */ 136 #endif 137 #ifndef LGRP_RSRC_MEM 138 #define LGRP_RSRC_MEM 1 /* memory resources */ 139 #endif 140 141 // Values for ThreadPriorityPolicy == 1 142 int prio_policy1[CriticalPriority+1] = { 143 -99999, 0, 16, 32, 48, 64, 144 80, 96, 112, 124, 127, 127 }; 145 146 // System parameters used internally 147 static clock_t clock_tics_per_sec = 100; 148 149 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+) 150 static bool enabled_extended_FILE_stdio = false; 151 152 // For diagnostics to print a message once. see run_periodic_checks 153 static bool check_addr0_done = false; 154 static sigset_t check_signal_done; 155 static bool check_signals = true; 156 157 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo 158 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo 159 160 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround 161 162 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL; 163 164 // "default" initializers for missing libc APIs 165 extern "C" { 166 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 167 static int lwp_mutex_destroy(mutex_t *mx) { return 0; } 168 169 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 170 static int lwp_cond_destroy(cond_t *cv) { return 0; } 171 } 172 173 // "default" initializers for pthread-based synchronization 174 extern "C" { 175 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 176 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 177 } 178 179 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); 180 181 static inline size_t adjust_stack_size(address base, size_t size) { 182 if ((ssize_t)size < 0) { 183 // 4759953: Compensate for ridiculous stack size. 184 size = max_intx; 185 } 186 if (size > (size_t)base) { 187 // 4812466: Make sure size doesn't allow the stack to wrap the address space. 188 size = (size_t)base; 189 } 190 return size; 191 } 192 193 static inline stack_t get_stack_info() { 194 stack_t st; 195 int retval = thr_stksegment(&st); 196 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); 197 assert(retval == 0, "incorrect return value from thr_stksegment"); 198 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 199 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 200 return st; 201 } 202 203 address os::current_stack_base() { 204 int r = thr_main(); 205 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 206 bool is_primordial_thread = r; 207 208 // Workaround 4352906, avoid calls to thr_stksegment by 209 // thr_main after the first one (it looks like we trash 210 // some data, causing the value for ss_sp to be incorrect). 211 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) { 212 stack_t st = get_stack_info(); 213 if (is_primordial_thread) { 214 // cache initial value of stack base 215 os::Solaris::_main_stack_base = (address)st.ss_sp; 216 } 217 return (address)st.ss_sp; 218 } else { 219 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); 220 return os::Solaris::_main_stack_base; 221 } 222 } 223 224 size_t os::current_stack_size() { 225 size_t size; 226 227 int r = thr_main(); 228 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 229 if (!r) { 230 size = get_stack_info().ss_size; 231 } else { 232 struct rlimit limits; 233 getrlimit(RLIMIT_STACK, &limits); 234 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); 235 } 236 // base may not be page aligned 237 address base = current_stack_base(); 238 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());; 239 return (size_t)(base - bottom); 240 } 241 242 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 243 return localtime_r(clock, res); 244 } 245 246 void os::Solaris::try_enable_extended_io() { 247 typedef int (*enable_extended_FILE_stdio_t)(int, int); 248 249 if (!UseExtendedFileIO) { 250 return; 251 } 252 253 enable_extended_FILE_stdio_t enabler = 254 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT, 255 "enable_extended_FILE_stdio"); 256 if (enabler) { 257 enabler(-1, -1); 258 } 259 } 260 261 static int _processors_online = 0; 262 263 jint os::Solaris::_os_thread_limit = 0; 264 volatile jint os::Solaris::_os_thread_count = 0; 265 266 julong os::available_memory() { 267 return Solaris::available_memory(); 268 } 269 270 julong os::Solaris::available_memory() { 271 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); 272 } 273 274 julong os::Solaris::_physical_memory = 0; 275 276 julong os::physical_memory() { 277 return Solaris::physical_memory(); 278 } 279 280 static hrtime_t first_hrtime = 0; 281 static const hrtime_t hrtime_hz = 1000*1000*1000; 282 static volatile hrtime_t max_hrtime = 0; 283 284 285 void os::Solaris::initialize_system_info() { 286 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); 287 _processors_online = sysconf(_SC_NPROCESSORS_ONLN); 288 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * 289 (julong)sysconf(_SC_PAGESIZE); 290 } 291 292 int os::active_processor_count() { 293 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 294 pid_t pid = getpid(); 295 psetid_t pset = PS_NONE; 296 // Are we running in a processor set or is there any processor set around? 297 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) { 298 uint_t pset_cpus; 299 // Query the number of cpus available to us. 300 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) { 301 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check"); 302 _processors_online = pset_cpus; 303 return pset_cpus; 304 } 305 } 306 // Otherwise return number of online cpus 307 return online_cpus; 308 } 309 310 static bool find_processors_in_pset(psetid_t pset, 311 processorid_t** id_array, 312 uint_t* id_length) { 313 bool result = false; 314 // Find the number of processors in the processor set. 315 if (pset_info(pset, NULL, id_length, NULL) == 0) { 316 // Make up an array to hold their ids. 317 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 318 // Fill in the array with their processor ids. 319 if (pset_info(pset, NULL, id_length, *id_array) == 0) { 320 result = true; 321 } 322 } 323 return result; 324 } 325 326 // Callers of find_processors_online() must tolerate imprecise results -- 327 // the system configuration can change asynchronously because of DR 328 // or explicit psradm operations. 329 // 330 // We also need to take care that the loop (below) terminates as the 331 // number of processors online can change between the _SC_NPROCESSORS_ONLN 332 // request and the loop that builds the list of processor ids. Unfortunately 333 // there's no reliable way to determine the maximum valid processor id, 334 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online 335 // man pages, which claim the processor id set is "sparse, but 336 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually 337 // exit the loop. 338 // 339 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's 340 // not available on S8.0. 341 342 static bool find_processors_online(processorid_t** id_array, 343 uint* id_length) { 344 const processorid_t MAX_PROCESSOR_ID = 100000; 345 // Find the number of processors online. 346 *id_length = sysconf(_SC_NPROCESSORS_ONLN); 347 // Make up an array to hold their ids. 348 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 349 // Processors need not be numbered consecutively. 350 long found = 0; 351 processorid_t next = 0; 352 while (found < *id_length && next < MAX_PROCESSOR_ID) { 353 processor_info_t info; 354 if (processor_info(next, &info) == 0) { 355 // NB, PI_NOINTR processors are effectively online ... 356 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) { 357 (*id_array)[found] = next; 358 found += 1; 359 } 360 } 361 next += 1; 362 } 363 if (found < *id_length) { 364 // The loop above didn't identify the expected number of processors. 365 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN) 366 // and re-running the loop, above, but there's no guarantee of progress 367 // if the system configuration is in flux. Instead, we just return what 368 // we've got. Note that in the worst case find_processors_online() could 369 // return an empty set. (As a fall-back in the case of the empty set we 370 // could just return the ID of the current processor). 371 *id_length = found; 372 } 373 374 return true; 375 } 376 377 static bool assign_distribution(processorid_t* id_array, 378 uint id_length, 379 uint* distribution, 380 uint distribution_length) { 381 // We assume we can assign processorid_t's to uint's. 382 assert(sizeof(processorid_t) == sizeof(uint), 383 "can't convert processorid_t to uint"); 384 // Quick check to see if we won't succeed. 385 if (id_length < distribution_length) { 386 return false; 387 } 388 // Assign processor ids to the distribution. 389 // Try to shuffle processors to distribute work across boards, 390 // assuming 4 processors per board. 391 const uint processors_per_board = ProcessDistributionStride; 392 // Find the maximum processor id. 393 processorid_t max_id = 0; 394 for (uint m = 0; m < id_length; m += 1) { 395 max_id = MAX2(max_id, id_array[m]); 396 } 397 // The next id, to limit loops. 398 const processorid_t limit_id = max_id + 1; 399 // Make up markers for available processors. 400 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal); 401 for (uint c = 0; c < limit_id; c += 1) { 402 available_id[c] = false; 403 } 404 for (uint a = 0; a < id_length; a += 1) { 405 available_id[id_array[a]] = true; 406 } 407 // Step by "boards", then by "slot", copying to "assigned". 408 // NEEDS_CLEANUP: The assignment of processors should be stateful, 409 // remembering which processors have been assigned by 410 // previous calls, etc., so as to distribute several 411 // independent calls of this method. What we'd like is 412 // It would be nice to have an API that let us ask 413 // how many processes are bound to a processor, 414 // but we don't have that, either. 415 // In the short term, "board" is static so that 416 // subsequent distributions don't all start at board 0. 417 static uint board = 0; 418 uint assigned = 0; 419 // Until we've found enough processors .... 420 while (assigned < distribution_length) { 421 // ... find the next available processor in the board. 422 for (uint slot = 0; slot < processors_per_board; slot += 1) { 423 uint try_id = board * processors_per_board + slot; 424 if ((try_id < limit_id) && (available_id[try_id] == true)) { 425 distribution[assigned] = try_id; 426 available_id[try_id] = false; 427 assigned += 1; 428 break; 429 } 430 } 431 board += 1; 432 if (board * processors_per_board + 0 >= limit_id) { 433 board = 0; 434 } 435 } 436 if (available_id != NULL) { 437 FREE_C_HEAP_ARRAY(bool, available_id); 438 } 439 return true; 440 } 441 442 void os::set_native_thread_name(const char *name) { 443 if (Solaris::_pthread_setname_np != NULL) { 444 // Only the first 31 bytes of 'name' are processed by pthread_setname_np 445 // but we explicitly copy into a size-limited buffer to avoid any 446 // possible overflow. 447 char buf[32]; 448 snprintf(buf, sizeof(buf), "%s", name); 449 buf[sizeof(buf) - 1] = '\0'; 450 Solaris::_pthread_setname_np(pthread_self(), buf); 451 } 452 } 453 454 bool os::distribute_processes(uint length, uint* distribution) { 455 bool result = false; 456 // Find the processor id's of all the available CPUs. 457 processorid_t* id_array = NULL; 458 uint id_length = 0; 459 // There are some races between querying information and using it, 460 // since processor sets can change dynamically. 461 psetid_t pset = PS_NONE; 462 // Are we running in a processor set? 463 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) { 464 result = find_processors_in_pset(pset, &id_array, &id_length); 465 } else { 466 result = find_processors_online(&id_array, &id_length); 467 } 468 if (result == true) { 469 if (id_length >= length) { 470 result = assign_distribution(id_array, id_length, distribution, length); 471 } else { 472 result = false; 473 } 474 } 475 if (id_array != NULL) { 476 FREE_C_HEAP_ARRAY(processorid_t, id_array); 477 } 478 return result; 479 } 480 481 bool os::bind_to_processor(uint processor_id) { 482 // We assume that a processorid_t can be stored in a uint. 483 assert(sizeof(uint) == sizeof(processorid_t), 484 "can't convert uint to processorid_t"); 485 int bind_result = 486 processor_bind(P_LWPID, // bind LWP. 487 P_MYID, // bind current LWP. 488 (processorid_t) processor_id, // id. 489 NULL); // don't return old binding. 490 return (bind_result == 0); 491 } 492 493 // Return true if user is running as root. 494 495 bool os::have_special_privileges() { 496 static bool init = false; 497 static bool privileges = false; 498 if (!init) { 499 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 500 init = true; 501 } 502 return privileges; 503 } 504 505 506 void os::init_system_properties_values() { 507 // The next steps are taken in the product version: 508 // 509 // Obtain the JAVA_HOME value from the location of libjvm.so. 510 // This library should be located at: 511 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 512 // 513 // If "/jre/lib/" appears at the right place in the path, then we 514 // assume libjvm.so is installed in a JDK and we use this path. 515 // 516 // Otherwise exit with message: "Could not create the Java virtual machine." 517 // 518 // The following extra steps are taken in the debugging version: 519 // 520 // If "/jre/lib/" does NOT appear at the right place in the path 521 // instead of exit check for $JAVA_HOME environment variable. 522 // 523 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 524 // then we append a fake suffix "hotspot/libjvm.so" to this path so 525 // it looks like libjvm.so is installed there 526 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 527 // 528 // Otherwise exit. 529 // 530 // Important note: if the location of libjvm.so changes this 531 // code needs to be changed accordingly. 532 533 // Base path of extensions installed on the system. 534 #define SYS_EXT_DIR "/usr/jdk/packages" 535 #define EXTENSIONS_DIR "/lib/ext" 536 537 char cpu_arch[12]; 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/") + strlen(cpu_arch), // 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 /<arch>. 565 pslash = strrchr(buf, '/'); 566 if (pslash != NULL) { 567 *pslash = '\0'; // Get rid of /lib. 568 } 569 } 570 } 571 Arguments::set_java_home(buf); 572 set_boot_path('/', ':'); 573 } 574 575 // Where to look for native libraries. 576 { 577 // Use dlinfo() to determine the correct java.library.path. 578 // 579 // If we're launched by the Java launcher, and the user 580 // does not set java.library.path explicitly on the commandline, 581 // the Java launcher sets LD_LIBRARY_PATH for us and unsets 582 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case 583 // dlinfo returns LD_LIBRARY_PATH + crle settings (including 584 // /usr/lib), which is exactly what we want. 585 // 586 // If the user does set java.library.path, it completely 587 // overwrites this setting, and always has. 588 // 589 // If we're not launched by the Java launcher, we may 590 // get here with any/all of the LD_LIBRARY_PATH[_32|64] 591 // settings. Again, dlinfo does exactly what we want. 592 593 Dl_serinfo info_sz, *info = &info_sz; 594 Dl_serpath *path; 595 char *library_path; 596 char *common_path = buf; 597 598 // Determine search path count and required buffer size. 599 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) { 600 FREE_C_HEAP_ARRAY(char, buf); 601 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror()); 602 } 603 604 // Allocate new buffer and initialize. 605 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal); 606 info->dls_size = info_sz.dls_size; 607 info->dls_cnt = info_sz.dls_cnt; 608 609 // Obtain search path information. 610 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) { 611 FREE_C_HEAP_ARRAY(char, buf); 612 FREE_C_HEAP_ARRAY(char, info); 613 vm_exit_during_initialization("dlinfo SERINFO request", dlerror()); 614 } 615 616 path = &info->dls_serpath[0]; 617 618 // Note: Due to a legacy implementation, most of the library path 619 // is set in the launcher. This was to accomodate linking restrictions 620 // on legacy Solaris implementations (which are no longer supported). 621 // Eventually, all the library path setting will be done here. 622 // 623 // However, to prevent the proliferation of improperly built native 624 // libraries, the new path component /usr/jdk/packages is added here. 625 626 // Determine the actual CPU architecture. 627 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 628 #ifdef _LP64 629 // If we are a 64-bit vm, perform the following translations: 630 // sparc -> sparcv9 631 // i386 -> amd64 632 if (strcmp(cpu_arch, "sparc") == 0) { 633 strcat(cpu_arch, "v9"); 634 } else if (strcmp(cpu_arch, "i386") == 0) { 635 strcpy(cpu_arch, "amd64"); 636 } 637 #endif 638 639 // Construct the invariant part of ld_library_path. 640 sprintf(common_path, SYS_EXT_DIR "/lib/%s", cpu_arch); 641 642 // Struct size is more than sufficient for the path components obtained 643 // through the dlinfo() call, so only add additional space for the path 644 // components explicitly added here. 645 size_t library_path_size = info->dls_size + strlen(common_path); 646 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal); 647 library_path[0] = '\0'; 648 649 // Construct the desired Java library path from the linker's library 650 // search path. 651 // 652 // For compatibility, it is optimal that we insert the additional path 653 // components specific to the Java VM after those components specified 654 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so 655 // infrastructure. 656 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it. 657 strcpy(library_path, common_path); 658 } else { 659 int inserted = 0; 660 int i; 661 for (i = 0; i < info->dls_cnt; i++, path++) { 662 uint_t flags = path->dls_flags & LA_SER_MASK; 663 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) { 664 strcat(library_path, common_path); 665 strcat(library_path, os::path_separator()); 666 inserted = 1; 667 } 668 strcat(library_path, path->dls_name); 669 strcat(library_path, os::path_separator()); 670 } 671 // Eliminate trailing path separator. 672 library_path[strlen(library_path)-1] = '\0'; 673 } 674 675 // happens before argument parsing - can't use a trace flag 676 // tty->print_raw("init_system_properties_values: native lib path: "); 677 // tty->print_raw_cr(library_path); 678 679 // Callee copies into its own buffer. 680 Arguments::set_library_path(library_path); 681 682 FREE_C_HEAP_ARRAY(char, library_path); 683 FREE_C_HEAP_ARRAY(char, info); 684 } 685 686 // Extensions directories. 687 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); 688 Arguments::set_ext_dirs(buf); 689 690 FREE_C_HEAP_ARRAY(char, buf); 691 692 #undef SYS_EXT_DIR 693 #undef EXTENSIONS_DIR 694 } 695 696 void os::breakpoint() { 697 BREAKPOINT; 698 } 699 700 bool os::obsolete_option(const JavaVMOption *option) { 701 if (!strncmp(option->optionString, "-Xt", 3)) { 702 return true; 703 } else if (!strncmp(option->optionString, "-Xtm", 4)) { 704 return true; 705 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) { 706 return true; 707 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) { 708 return true; 709 } 710 return false; 711 } 712 713 bool os::Solaris::valid_stack_address(Thread* thread, address sp) { 714 address stackStart = (address)thread->stack_base(); 715 address stackEnd = (address)(stackStart - (address)thread->stack_size()); 716 if (sp < stackStart && sp >= stackEnd) return true; 717 return false; 718 } 719 720 extern "C" void breakpoint() { 721 // use debugger to set breakpoint here 722 } 723 724 static thread_t main_thread; 725 726 // Thread start routine for all newly created threads 727 extern "C" void* thread_native_entry(void* thread_addr) { 728 // Try to randomize the cache line index of hot stack frames. 729 // This helps when threads of the same stack traces evict each other's 730 // cache lines. The threads can be either from the same JVM instance, or 731 // from different JVM instances. The benefit is especially true for 732 // processors with hyperthreading technology. 733 static int counter = 0; 734 int pid = os::current_process_id(); 735 alloca(((pid ^ counter++) & 7) * 128); 736 737 int prio; 738 Thread* thread = (Thread*)thread_addr; 739 740 thread->initialize_thread_current(); 741 742 OSThread* osthr = thread->osthread(); 743 744 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound 745 thread->_schedctl = (void *) schedctl_init(); 746 747 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", 748 os::current_thread_id()); 749 750 if (UseNUMA) { 751 int lgrp_id = os::numa_get_group_id(); 752 if (lgrp_id != -1) { 753 thread->set_lgrp_id(lgrp_id); 754 } 755 } 756 757 // Our priority was set when we were created, and stored in the 758 // osthread, but couldn't be passed through to our LWP until now. 759 // So read back the priority and set it again. 760 761 if (osthr->thread_id() != -1) { 762 if (UseThreadPriorities) { 763 int prio = osthr->native_priority(); 764 if (ThreadPriorityVerbose) { 765 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " 766 INTPTR_FORMAT ", setting priority: %d\n", 767 osthr->thread_id(), osthr->lwp_id(), prio); 768 } 769 os::set_native_priority(thread, prio); 770 } 771 } else if (ThreadPriorityVerbose) { 772 warning("Can't set priority in _start routine, thread id hasn't been set\n"); 773 } 774 775 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 776 777 // initialize signal mask for this thread 778 os::Solaris::hotspot_sigmask(thread); 779 780 thread->run(); 781 782 // One less thread is executing 783 // When the VMThread gets here, the main thread may have already exited 784 // which frees the CodeHeap containing the Atomic::dec code 785 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 786 Atomic::dec(&os::Solaris::_os_thread_count); 787 } 788 789 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id()); 790 791 // If a thread has not deleted itself ("delete this") as part of its 792 // termination sequence, we have to ensure thread-local-storage is 793 // cleared before we actually terminate. No threads should ever be 794 // deleted asynchronously with respect to their termination. 795 if (Thread::current_or_null_safe() != NULL) { 796 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 797 thread->clear_thread_current(); 798 } 799 800 if (UseDetachedThreads) { 801 thr_exit(NULL); 802 ShouldNotReachHere(); 803 } 804 return NULL; 805 } 806 807 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) { 808 // Allocate the OSThread object 809 OSThread* osthread = new OSThread(NULL, NULL); 810 if (osthread == NULL) return NULL; 811 812 // Store info on the Solaris thread into the OSThread 813 osthread->set_thread_id(thread_id); 814 osthread->set_lwp_id(_lwp_self()); 815 thread->_schedctl = (void *) schedctl_init(); 816 817 if (UseNUMA) { 818 int lgrp_id = os::numa_get_group_id(); 819 if (lgrp_id != -1) { 820 thread->set_lgrp_id(lgrp_id); 821 } 822 } 823 824 if (ThreadPriorityVerbose) { 825 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n", 826 osthread->thread_id(), osthread->lwp_id()); 827 } 828 829 // Initial thread state is INITIALIZED, not SUSPENDED 830 osthread->set_state(INITIALIZED); 831 832 return osthread; 833 } 834 835 void os::Solaris::hotspot_sigmask(Thread* thread) { 836 //Save caller's signal mask 837 sigset_t sigmask; 838 pthread_sigmask(SIG_SETMASK, NULL, &sigmask); 839 OSThread *osthread = thread->osthread(); 840 osthread->set_caller_sigmask(sigmask); 841 842 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL); 843 if (!ReduceSignalUsage) { 844 if (thread->is_VM_thread()) { 845 // Only the VM thread handles BREAK_SIGNAL ... 846 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 847 } else { 848 // ... all other threads block BREAK_SIGNAL 849 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked"); 850 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 851 } 852 } 853 } 854 855 bool os::create_attached_thread(JavaThread* thread) { 856 #ifdef ASSERT 857 thread->verify_not_published(); 858 #endif 859 OSThread* osthread = create_os_thread(thread, thr_self()); 860 if (osthread == NULL) { 861 return false; 862 } 863 864 // Initial thread state is RUNNABLE 865 osthread->set_state(RUNNABLE); 866 thread->set_osthread(osthread); 867 868 // initialize signal mask for this thread 869 // and save the caller's signal mask 870 os::Solaris::hotspot_sigmask(thread); 871 872 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").", 873 os::current_thread_id()); 874 875 return true; 876 } 877 878 bool os::create_main_thread(JavaThread* thread) { 879 #ifdef ASSERT 880 thread->verify_not_published(); 881 #endif 882 if (_starting_thread == NULL) { 883 _starting_thread = create_os_thread(thread, main_thread); 884 if (_starting_thread == NULL) { 885 return false; 886 } 887 } 888 889 // The primodial thread is runnable from the start 890 _starting_thread->set_state(RUNNABLE); 891 892 thread->set_osthread(_starting_thread); 893 894 // initialize signal mask for this thread 895 // and save the caller's signal mask 896 os::Solaris::hotspot_sigmask(thread); 897 898 return true; 899 } 900 901 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr() 902 static char* describe_thr_create_attributes(char* buf, size_t buflen, 903 size_t stacksize, long flags) { 904 stringStream ss(buf, buflen); 905 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024); 906 ss.print("flags: "); 907 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " "); 908 #define ALL(X) \ 909 X(THR_SUSPENDED) \ 910 X(THR_DETACHED) \ 911 X(THR_BOUND) \ 912 X(THR_NEW_LWP) \ 913 X(THR_DAEMON) 914 ALL(PRINT_FLAG) 915 #undef ALL 916 #undef PRINT_FLAG 917 return buf; 918 } 919 920 // return default stack size for thr_type 921 size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 922 // default stack size when not specified by caller is 1M (2M for LP64) 923 size_t s = (BytesPerWord >> 2) * K * K; 924 return s; 925 } 926 927 bool os::create_thread(Thread* thread, ThreadType thr_type, 928 size_t req_stack_size) { 929 // Allocate the OSThread object 930 OSThread* osthread = new OSThread(NULL, NULL); 931 if (osthread == NULL) { 932 return false; 933 } 934 935 if (ThreadPriorityVerbose) { 936 char *thrtyp; 937 switch (thr_type) { 938 case vm_thread: 939 thrtyp = (char *)"vm"; 940 break; 941 case cgc_thread: 942 thrtyp = (char *)"cgc"; 943 break; 944 case pgc_thread: 945 thrtyp = (char *)"pgc"; 946 break; 947 case java_thread: 948 thrtyp = (char *)"java"; 949 break; 950 case compiler_thread: 951 thrtyp = (char *)"compiler"; 952 break; 953 case watcher_thread: 954 thrtyp = (char *)"watcher"; 955 break; 956 default: 957 thrtyp = (char *)"unknown"; 958 break; 959 } 960 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp); 961 } 962 963 // calculate stack size if it's not specified by caller 964 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 965 966 // Initial state is ALLOCATED but not INITIALIZED 967 osthread->set_state(ALLOCATED); 968 969 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) { 970 // We got lots of threads. Check if we still have some address space left. 971 // Need to be at least 5Mb of unreserved address space. We do check by 972 // trying to reserve some. 973 const size_t VirtualMemoryBangSize = 20*K*K; 974 char* mem = os::reserve_memory(VirtualMemoryBangSize); 975 if (mem == NULL) { 976 delete osthread; 977 return false; 978 } else { 979 // Release the memory again 980 os::release_memory(mem, VirtualMemoryBangSize); 981 } 982 } 983 984 // Setup osthread because the child thread may need it. 985 thread->set_osthread(osthread); 986 987 // Create the Solaris thread 988 thread_t tid = 0; 989 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED; 990 int status; 991 992 // Mark that we don't have an lwp or thread id yet. 993 // In case we attempt to set the priority before the thread starts. 994 osthread->set_lwp_id(-1); 995 osthread->set_thread_id(-1); 996 997 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid); 998 999 char buf[64]; 1000 if (status == 0) { 1001 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ", 1002 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 1003 } else { 1004 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.", 1005 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 1006 } 1007 1008 if (status != 0) { 1009 thread->set_osthread(NULL); 1010 // Need to clean up stuff we've allocated so far 1011 delete osthread; 1012 return false; 1013 } 1014 1015 Atomic::inc(&os::Solaris::_os_thread_count); 1016 1017 // Store info on the Solaris thread into the OSThread 1018 osthread->set_thread_id(tid); 1019 1020 // Remember that we created this thread so we can set priority on it 1021 osthread->set_vm_created(); 1022 1023 // Most thread types will set an explicit priority before starting the thread, 1024 // but for those that don't we need a valid value to read back in thread_native_entry. 1025 osthread->set_native_priority(NormPriority); 1026 1027 // Initial thread state is INITIALIZED, not SUSPENDED 1028 osthread->set_state(INITIALIZED); 1029 1030 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 1031 return true; 1032 } 1033 1034 // defined for >= Solaris 10. This allows builds on earlier versions 1035 // of Solaris to take advantage of the newly reserved Solaris JVM signals. 1036 // With SIGJVM1, SIGJVM2, ASYNC_SIGNAL is SIGJVM2. Previously INTERRUPT_SIGNAL 1037 // was SIGJVM1. 1038 // 1039 #if !defined(SIGJVM1) 1040 #define SIGJVM1 39 1041 #define SIGJVM2 40 1042 #endif 1043 1044 debug_only(static bool signal_sets_initialized = false); 1045 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 1046 1047 int os::Solaris::_SIGasync = ASYNC_SIGNAL; 1048 1049 bool os::Solaris::is_sig_ignored(int sig) { 1050 struct sigaction oact; 1051 sigaction(sig, (struct sigaction*)NULL, &oact); 1052 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 1053 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 1054 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) { 1055 return true; 1056 } else { 1057 return false; 1058 } 1059 } 1060 1061 // Note: SIGRTMIN is a macro that calls sysconf() so it will 1062 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime 1063 static bool isJVM1available() { 1064 return SIGJVM1 < SIGRTMIN; 1065 } 1066 1067 void os::Solaris::signal_sets_init() { 1068 // Should also have an assertion stating we are still single-threaded. 1069 assert(!signal_sets_initialized, "Already initialized"); 1070 // Fill in signals that are necessarily unblocked for all threads in 1071 // the VM. Currently, we unblock the following signals: 1072 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 1073 // by -Xrs (=ReduceSignalUsage)); 1074 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 1075 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 1076 // the dispositions or masks wrt these signals. 1077 // Programs embedding the VM that want to use the above signals for their 1078 // own purposes must, at this time, use the "-Xrs" option to prevent 1079 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 1080 // (See bug 4345157, and other related bugs). 1081 // In reality, though, unblocking these signals is really a nop, since 1082 // these signals are not blocked by default. 1083 sigemptyset(&unblocked_sigs); 1084 sigemptyset(&allowdebug_blocked_sigs); 1085 sigaddset(&unblocked_sigs, SIGILL); 1086 sigaddset(&unblocked_sigs, SIGSEGV); 1087 sigaddset(&unblocked_sigs, SIGBUS); 1088 sigaddset(&unblocked_sigs, SIGFPE); 1089 1090 // Always true on Solaris 10+ 1091 guarantee(isJVM1available(), "SIGJVM1/2 missing!"); 1092 os::Solaris::set_SIGasync(SIGJVM2); 1093 1094 sigaddset(&unblocked_sigs, os::Solaris::SIGasync()); 1095 1096 if (!ReduceSignalUsage) { 1097 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 1098 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 1099 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 1100 } 1101 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 1102 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 1103 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 1104 } 1105 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 1106 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 1107 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 1108 } 1109 } 1110 // Fill in signals that are blocked by all but the VM thread. 1111 sigemptyset(&vm_sigs); 1112 if (!ReduceSignalUsage) { 1113 sigaddset(&vm_sigs, BREAK_SIGNAL); 1114 } 1115 debug_only(signal_sets_initialized = true); 1116 1117 // For diagnostics only used in run_periodic_checks 1118 sigemptyset(&check_signal_done); 1119 } 1120 1121 // These are signals that are unblocked while a thread is running Java. 1122 // (For some reason, they get blocked by default.) 1123 sigset_t* os::Solaris::unblocked_signals() { 1124 assert(signal_sets_initialized, "Not initialized"); 1125 return &unblocked_sigs; 1126 } 1127 1128 // These are the signals that are blocked while a (non-VM) thread is 1129 // running Java. Only the VM thread handles these signals. 1130 sigset_t* os::Solaris::vm_signals() { 1131 assert(signal_sets_initialized, "Not initialized"); 1132 return &vm_sigs; 1133 } 1134 1135 // These are signals that are blocked during cond_wait to allow debugger in 1136 sigset_t* os::Solaris::allowdebug_blocked_signals() { 1137 assert(signal_sets_initialized, "Not initialized"); 1138 return &allowdebug_blocked_sigs; 1139 } 1140 1141 1142 void _handle_uncaught_cxx_exception() { 1143 VMError::report_and_die("An uncaught C++ exception"); 1144 } 1145 1146 1147 // First crack at OS-specific initialization, from inside the new thread. 1148 void os::initialize_thread(Thread* thr) { 1149 int r = thr_main(); 1150 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 1151 if (r) { 1152 JavaThread* jt = (JavaThread *)thr; 1153 assert(jt != NULL, "Sanity check"); 1154 size_t stack_size; 1155 address base = jt->stack_base(); 1156 if (Arguments::created_by_java_launcher()) { 1157 // Use 2MB to allow for Solaris 7 64 bit mode. 1158 stack_size = JavaThread::stack_size_at_create() == 0 1159 ? 2048*K : JavaThread::stack_size_at_create(); 1160 1161 // There are rare cases when we may have already used more than 1162 // the basic stack size allotment before this method is invoked. 1163 // Attempt to allow for a normally sized java_stack. 1164 size_t current_stack_offset = (size_t)(base - (address)&stack_size); 1165 stack_size += ReservedSpace::page_align_size_down(current_stack_offset); 1166 } else { 1167 // 6269555: If we were not created by a Java launcher, i.e. if we are 1168 // running embedded in a native application, treat the primordial thread 1169 // as much like a native attached thread as possible. This means using 1170 // the current stack size from thr_stksegment(), unless it is too large 1171 // to reliably setup guard pages. A reasonable max size is 8MB. 1172 size_t current_size = current_stack_size(); 1173 // This should never happen, but just in case.... 1174 if (current_size == 0) current_size = 2 * K * K; 1175 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size; 1176 } 1177 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());; 1178 stack_size = (size_t)(base - bottom); 1179 1180 assert(stack_size > 0, "Stack size calculation problem"); 1181 1182 if (stack_size > jt->stack_size()) { 1183 #ifndef PRODUCT 1184 struct rlimit limits; 1185 getrlimit(RLIMIT_STACK, &limits); 1186 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur); 1187 assert(size >= jt->stack_size(), "Stack size problem in main thread"); 1188 #endif 1189 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n" 1190 "(Stack sizes are rounded up to a multiple of the system page size.)\n" 1191 "See limit(1) to increase the stack size limit.", 1192 stack_size / K, jt->stack_size() / K); 1193 vm_exit(1); 1194 } 1195 assert(jt->stack_size() >= stack_size, 1196 "Attempt to map more stack than was allocated"); 1197 jt->set_stack_size(stack_size); 1198 } 1199 1200 // With the T2 libthread (T1 is no longer supported) threads are always bound 1201 // and we use stackbanging in all cases. 1202 1203 os::Solaris::init_thread_fpu_state(); 1204 std::set_terminate(_handle_uncaught_cxx_exception); 1205 } 1206 1207 1208 1209 // Free Solaris resources related to the OSThread 1210 void os::free_thread(OSThread* osthread) { 1211 assert(osthread != NULL, "os::free_thread but osthread not set"); 1212 1213 // We are told to free resources of the argument thread, 1214 // but we can only really operate on the current thread. 1215 assert(Thread::current()->osthread() == osthread, 1216 "os::free_thread but not current thread"); 1217 1218 // Restore caller's signal mask 1219 sigset_t sigmask = osthread->caller_sigmask(); 1220 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 1221 1222 delete osthread; 1223 } 1224 1225 void os::pd_start_thread(Thread* thread) { 1226 int status = thr_continue(thread->osthread()->thread_id()); 1227 assert_status(status == 0, status, "thr_continue failed"); 1228 } 1229 1230 1231 intx os::current_thread_id() { 1232 return (intx)thr_self(); 1233 } 1234 1235 static pid_t _initial_pid = 0; 1236 1237 int os::current_process_id() { 1238 return (int)(_initial_pid ? _initial_pid : getpid()); 1239 } 1240 1241 // gethrtime() should be monotonic according to the documentation, 1242 // but some virtualized platforms are known to break this guarantee. 1243 // getTimeNanos() must be guaranteed not to move backwards, so we 1244 // are forced to add a check here. 1245 inline hrtime_t getTimeNanos() { 1246 const hrtime_t now = gethrtime(); 1247 const hrtime_t prev = max_hrtime; 1248 if (now <= prev) { 1249 return prev; // same or retrograde time; 1250 } 1251 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev); 1252 assert(obsv >= prev, "invariant"); // Monotonicity 1253 // If the CAS succeeded then we're done and return "now". 1254 // If the CAS failed and the observed value "obsv" is >= now then 1255 // we should return "obsv". If the CAS failed and now > obsv > prv then 1256 // some other thread raced this thread and installed a new value, in which case 1257 // we could either (a) retry the entire operation, (b) retry trying to install now 1258 // or (c) just return obsv. We use (c). No loop is required although in some cases 1259 // we might discard a higher "now" value in deference to a slightly lower but freshly 1260 // installed obsv value. That's entirely benign -- it admits no new orderings compared 1261 // to (a) or (b) -- and greatly reduces coherence traffic. 1262 // We might also condition (c) on the magnitude of the delta between obsv and now. 1263 // Avoiding excessive CAS operations to hot RW locations is critical. 1264 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 1265 return (prev == obsv) ? now : obsv; 1266 } 1267 1268 // Time since start-up in seconds to a fine granularity. 1269 // Used by VMSelfDestructTimer and the MemProfiler. 1270 double os::elapsedTime() { 1271 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1272 } 1273 1274 jlong os::elapsed_counter() { 1275 return (jlong)(getTimeNanos() - first_hrtime); 1276 } 1277 1278 jlong os::elapsed_frequency() { 1279 return hrtime_hz; 1280 } 1281 1282 // Return the real, user, and system times in seconds from an 1283 // arbitrary fixed point in the past. 1284 bool os::getTimesSecs(double* process_real_time, 1285 double* process_user_time, 1286 double* process_system_time) { 1287 struct tms ticks; 1288 clock_t real_ticks = times(&ticks); 1289 1290 if (real_ticks == (clock_t) (-1)) { 1291 return false; 1292 } else { 1293 double ticks_per_second = (double) clock_tics_per_sec; 1294 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1295 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1296 // For consistency return the real time from getTimeNanos() 1297 // converted to seconds. 1298 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); 1299 1300 return true; 1301 } 1302 } 1303 1304 bool os::supports_vtime() { return true; } 1305 bool os::enable_vtime() { return false; } 1306 bool os::vtime_enabled() { return false; } 1307 1308 double os::elapsedVTime() { 1309 return (double)gethrvtime() / (double)hrtime_hz; 1310 } 1311 1312 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 1313 jlong os::javaTimeMillis() { 1314 timeval t; 1315 if (gettimeofday(&t, NULL) == -1) { 1316 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno)); 1317 } 1318 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; 1319 } 1320 1321 // Must return seconds+nanos since Jan 1 1970. This must use the same 1322 // time source as javaTimeMillis and can't use get_nsec_fromepoch as 1323 // we need better than 1ms accuracy 1324 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 1325 timeval t; 1326 if (gettimeofday(&t, NULL) == -1) { 1327 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno)); 1328 } 1329 seconds = jlong(t.tv_sec); 1330 nanos = jlong(t.tv_usec) * 1000; 1331 } 1332 1333 1334 jlong os::javaTimeNanos() { 1335 return (jlong)getTimeNanos(); 1336 } 1337 1338 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1339 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits 1340 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1341 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1342 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1343 } 1344 1345 char * os::local_time_string(char *buf, size_t buflen) { 1346 struct tm t; 1347 time_t long_time; 1348 time(&long_time); 1349 localtime_r(&long_time, &t); 1350 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1351 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1352 t.tm_hour, t.tm_min, t.tm_sec); 1353 return buf; 1354 } 1355 1356 // Note: os::shutdown() might be called very early during initialization, or 1357 // called from signal handler. Before adding something to os::shutdown(), make 1358 // sure it is async-safe and can handle partially initialized VM. 1359 void os::shutdown() { 1360 1361 // allow PerfMemory to attempt cleanup of any persistent resources 1362 perfMemory_exit(); 1363 1364 // needs to remove object in file system 1365 AttachListener::abort(); 1366 1367 // flush buffered output, finish log files 1368 ostream_abort(); 1369 1370 // Check for abort hook 1371 abort_hook_t abort_hook = Arguments::abort_hook(); 1372 if (abort_hook != NULL) { 1373 abort_hook(); 1374 } 1375 } 1376 1377 // Note: os::abort() might be called very early during initialization, or 1378 // called from signal handler. Before adding something to os::abort(), make 1379 // sure it is async-safe and can handle partially initialized VM. 1380 void os::abort(bool dump_core, void* siginfo, const void* context) { 1381 os::shutdown(); 1382 if (dump_core) { 1383 #ifndef PRODUCT 1384 fdStream out(defaultStream::output_fd()); 1385 out.print_raw("Current thread is "); 1386 char buf[16]; 1387 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1388 out.print_raw_cr(buf); 1389 out.print_raw_cr("Dumping core ..."); 1390 #endif 1391 ::abort(); // dump core (for debugging) 1392 } 1393 1394 ::exit(1); 1395 } 1396 1397 // Die immediately, no exit hook, no abort hook, no cleanup. 1398 void os::die() { 1399 ::abort(); // dump core (for debugging) 1400 } 1401 1402 // DLL functions 1403 1404 const char* os::dll_file_extension() { return ".so"; } 1405 1406 // This must be hard coded because it's the system's temporary 1407 // directory not the java application's temp directory, ala java.io.tmpdir. 1408 const char* os::get_temp_directory() { return "/tmp"; } 1409 1410 static bool file_exists(const char* filename) { 1411 struct stat statbuf; 1412 if (filename == NULL || strlen(filename) == 0) { 1413 return false; 1414 } 1415 return os::stat(filename, &statbuf) == 0; 1416 } 1417 1418 bool os::dll_build_name(char* buffer, size_t buflen, 1419 const char* pname, const char* fname) { 1420 bool retval = false; 1421 const size_t pnamelen = pname ? strlen(pname) : 0; 1422 1423 // Return error on buffer overflow. 1424 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { 1425 return retval; 1426 } 1427 1428 if (pnamelen == 0) { 1429 snprintf(buffer, buflen, "lib%s.so", fname); 1430 retval = true; 1431 } else if (strchr(pname, *os::path_separator()) != NULL) { 1432 int n; 1433 char** pelements = split_path(pname, &n); 1434 if (pelements == NULL) { 1435 return false; 1436 } 1437 for (int i = 0; i < n; i++) { 1438 // really shouldn't be NULL but what the heck, check can't hurt 1439 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1440 continue; // skip the empty path values 1441 } 1442 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); 1443 if (file_exists(buffer)) { 1444 retval = true; 1445 break; 1446 } 1447 } 1448 // release the storage 1449 for (int i = 0; i < n; i++) { 1450 if (pelements[i] != NULL) { 1451 FREE_C_HEAP_ARRAY(char, pelements[i]); 1452 } 1453 } 1454 if (pelements != NULL) { 1455 FREE_C_HEAP_ARRAY(char*, pelements); 1456 } 1457 } else { 1458 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); 1459 retval = true; 1460 } 1461 return retval; 1462 } 1463 1464 // check if addr is inside libjvm.so 1465 bool os::address_is_in_vm(address addr) { 1466 static address libjvm_base_addr; 1467 Dl_info dlinfo; 1468 1469 if (libjvm_base_addr == NULL) { 1470 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1471 libjvm_base_addr = (address)dlinfo.dli_fbase; 1472 } 1473 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1474 } 1475 1476 if (dladdr((void *)addr, &dlinfo) != 0) { 1477 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1478 } 1479 1480 return false; 1481 } 1482 1483 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int); 1484 static dladdr1_func_type dladdr1_func = NULL; 1485 1486 bool os::dll_address_to_function_name(address addr, char *buf, 1487 int buflen, int * offset, 1488 bool demangle) { 1489 // buf is not optional, but offset is optional 1490 assert(buf != NULL, "sanity check"); 1491 1492 Dl_info dlinfo; 1493 1494 // dladdr1_func was initialized in os::init() 1495 if (dladdr1_func != NULL) { 1496 // yes, we have dladdr1 1497 1498 // Support for dladdr1 is checked at runtime; it may be 1499 // available even if the vm is built on a machine that does 1500 // not have dladdr1 support. Make sure there is a value for 1501 // RTLD_DL_SYMENT. 1502 #ifndef RTLD_DL_SYMENT 1503 #define RTLD_DL_SYMENT 1 1504 #endif 1505 #ifdef _LP64 1506 Elf64_Sym * info; 1507 #else 1508 Elf32_Sym * info; 1509 #endif 1510 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1511 RTLD_DL_SYMENT) != 0) { 1512 // see if we have a matching symbol that covers our address 1513 if (dlinfo.dli_saddr != NULL && 1514 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) { 1515 if (dlinfo.dli_sname != NULL) { 1516 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1517 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1518 } 1519 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1520 return true; 1521 } 1522 } 1523 // no matching symbol so try for just file info 1524 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1525 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1526 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1527 return true; 1528 } 1529 } 1530 } 1531 buf[0] = '\0'; 1532 if (offset != NULL) *offset = -1; 1533 return false; 1534 } 1535 1536 // no, only dladdr is available 1537 if (dladdr((void *)addr, &dlinfo) != 0) { 1538 // see if we have a matching symbol 1539 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1540 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1541 jio_snprintf(buf, buflen, dlinfo.dli_sname); 1542 } 1543 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1544 return true; 1545 } 1546 // no matching symbol so try for just file info 1547 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1548 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1549 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1550 return true; 1551 } 1552 } 1553 } 1554 buf[0] = '\0'; 1555 if (offset != NULL) *offset = -1; 1556 return false; 1557 } 1558 1559 bool os::dll_address_to_library_name(address addr, char* buf, 1560 int buflen, int* offset) { 1561 // buf is not optional, but offset is optional 1562 assert(buf != NULL, "sanity check"); 1563 1564 Dl_info dlinfo; 1565 1566 if (dladdr((void*)addr, &dlinfo) != 0) { 1567 if (dlinfo.dli_fname != NULL) { 1568 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1569 } 1570 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1571 *offset = addr - (address)dlinfo.dli_fbase; 1572 } 1573 return true; 1574 } 1575 1576 buf[0] = '\0'; 1577 if (offset) *offset = -1; 1578 return false; 1579 } 1580 1581 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1582 Dl_info dli; 1583 // Sanity check? 1584 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 || 1585 dli.dli_fname == NULL) { 1586 return 1; 1587 } 1588 1589 void * handle = dlopen(dli.dli_fname, RTLD_LAZY); 1590 if (handle == NULL) { 1591 return 1; 1592 } 1593 1594 Link_map *map; 1595 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1596 if (map == NULL) { 1597 dlclose(handle); 1598 return 1; 1599 } 1600 1601 while (map->l_prev != NULL) { 1602 map = map->l_prev; 1603 } 1604 1605 while (map != NULL) { 1606 // Iterate through all map entries and call callback with fields of interest 1607 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1608 dlclose(handle); 1609 return 1; 1610 } 1611 map = map->l_next; 1612 } 1613 1614 dlclose(handle); 1615 return 0; 1616 } 1617 1618 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1619 outputStream * out = (outputStream *) param; 1620 out->print_cr(PTR_FORMAT " \t%s", base_address, name); 1621 return 0; 1622 } 1623 1624 void os::print_dll_info(outputStream * st) { 1625 st->print_cr("Dynamic libraries:"); st->flush(); 1626 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1627 st->print_cr("Error: Cannot print dynamic libraries."); 1628 } 1629 } 1630 1631 // Loads .dll/.so and 1632 // in case of error it checks if .dll/.so was built for the 1633 // same architecture as Hotspot is running on 1634 1635 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1636 void * result= ::dlopen(filename, RTLD_LAZY); 1637 if (result != NULL) { 1638 // Successful loading 1639 return result; 1640 } 1641 1642 Elf32_Ehdr elf_head; 1643 1644 // Read system error message into ebuf 1645 // It may or may not be overwritten below 1646 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1647 ebuf[ebuflen-1]='\0'; 1648 int diag_msg_max_length=ebuflen-strlen(ebuf); 1649 char* diag_msg_buf=ebuf+strlen(ebuf); 1650 1651 if (diag_msg_max_length==0) { 1652 // No more space in ebuf for additional diagnostics message 1653 return NULL; 1654 } 1655 1656 1657 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1658 1659 if (file_descriptor < 0) { 1660 // Can't open library, report dlerror() message 1661 return NULL; 1662 } 1663 1664 bool failed_to_read_elf_head= 1665 (sizeof(elf_head)!= 1666 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1667 1668 ::close(file_descriptor); 1669 if (failed_to_read_elf_head) { 1670 // file i/o error - report dlerror() msg 1671 return NULL; 1672 } 1673 1674 typedef struct { 1675 Elf32_Half code; // Actual value as defined in elf.h 1676 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1677 char elf_class; // 32 or 64 bit 1678 char endianess; // MSB or LSB 1679 char* name; // String representation 1680 } arch_t; 1681 1682 static const arch_t arch_array[]={ 1683 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1684 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1685 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1686 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1687 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1688 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1689 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1690 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1691 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1692 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"} 1693 }; 1694 1695 #if (defined IA32) 1696 static Elf32_Half running_arch_code=EM_386; 1697 #elif (defined AMD64) 1698 static Elf32_Half running_arch_code=EM_X86_64; 1699 #elif (defined IA64) 1700 static Elf32_Half running_arch_code=EM_IA_64; 1701 #elif (defined __sparc) && (defined _LP64) 1702 static Elf32_Half running_arch_code=EM_SPARCV9; 1703 #elif (defined __sparc) && (!defined _LP64) 1704 static Elf32_Half running_arch_code=EM_SPARC; 1705 #elif (defined __powerpc64__) 1706 static Elf32_Half running_arch_code=EM_PPC64; 1707 #elif (defined __powerpc__) 1708 static Elf32_Half running_arch_code=EM_PPC; 1709 #elif (defined ARM) 1710 static Elf32_Half running_arch_code=EM_ARM; 1711 #else 1712 #error Method os::dll_load requires that one of following is defined:\ 1713 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM 1714 #endif 1715 1716 // Identify compatability class for VM's architecture and library's architecture 1717 // Obtain string descriptions for architectures 1718 1719 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1720 int running_arch_index=-1; 1721 1722 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1723 if (running_arch_code == arch_array[i].code) { 1724 running_arch_index = i; 1725 } 1726 if (lib_arch.code == arch_array[i].code) { 1727 lib_arch.compat_class = arch_array[i].compat_class; 1728 lib_arch.name = arch_array[i].name; 1729 } 1730 } 1731 1732 assert(running_arch_index != -1, 1733 "Didn't find running architecture code (running_arch_code) in arch_array"); 1734 if (running_arch_index == -1) { 1735 // Even though running architecture detection failed 1736 // we may still continue with reporting dlerror() message 1737 return NULL; 1738 } 1739 1740 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1741 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1742 return NULL; 1743 } 1744 1745 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1746 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1747 return NULL; 1748 } 1749 1750 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1751 if (lib_arch.name!=NULL) { 1752 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1753 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1754 lib_arch.name, arch_array[running_arch_index].name); 1755 } else { 1756 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1757 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1758 lib_arch.code, 1759 arch_array[running_arch_index].name); 1760 } 1761 } 1762 1763 return NULL; 1764 } 1765 1766 void* os::dll_lookup(void* handle, const char* name) { 1767 return dlsym(handle, name); 1768 } 1769 1770 void* os::get_default_process_handle() { 1771 return (void*)::dlopen(NULL, RTLD_LAZY); 1772 } 1773 1774 int os::stat(const char *path, struct stat *sbuf) { 1775 char pathbuf[MAX_PATH]; 1776 if (strlen(path) > MAX_PATH - 1) { 1777 errno = ENAMETOOLONG; 1778 return -1; 1779 } 1780 os::native_path(strcpy(pathbuf, path)); 1781 return ::stat(pathbuf, sbuf); 1782 } 1783 1784 static inline time_t get_mtime(const char* filename) { 1785 struct stat st; 1786 int ret = os::stat(filename, &st); 1787 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 1788 return st.st_mtime; 1789 } 1790 1791 int os::compare_file_modified_times(const char* file1, const char* file2) { 1792 time_t t1 = get_mtime(file1); 1793 time_t t2 = get_mtime(file2); 1794 return t1 - t2; 1795 } 1796 1797 static bool _print_ascii_file(const char* filename, outputStream* st) { 1798 int fd = ::open(filename, O_RDONLY); 1799 if (fd == -1) { 1800 return false; 1801 } 1802 1803 char buf[32]; 1804 int bytes; 1805 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1806 st->print_raw(buf, bytes); 1807 } 1808 1809 ::close(fd); 1810 1811 return true; 1812 } 1813 1814 void os::print_os_info_brief(outputStream* st) { 1815 os::Solaris::print_distro_info(st); 1816 1817 os::Posix::print_uname_info(st); 1818 1819 os::Solaris::print_libversion_info(st); 1820 } 1821 1822 void os::print_os_info(outputStream* st) { 1823 st->print("OS:"); 1824 1825 os::Solaris::print_distro_info(st); 1826 1827 os::Posix::print_uname_info(st); 1828 1829 os::Solaris::print_libversion_info(st); 1830 1831 os::Posix::print_rlimit_info(st); 1832 1833 os::Posix::print_load_average(st); 1834 } 1835 1836 void os::Solaris::print_distro_info(outputStream* st) { 1837 if (!_print_ascii_file("/etc/release", st)) { 1838 st->print("Solaris"); 1839 } 1840 st->cr(); 1841 } 1842 1843 void os::get_summary_os_info(char* buf, size_t buflen) { 1844 strncpy(buf, "Solaris", buflen); // default to plain solaris 1845 FILE* fp = fopen("/etc/release", "r"); 1846 if (fp != NULL) { 1847 char tmp[256]; 1848 // Only get the first line and chop out everything but the os name. 1849 if (fgets(tmp, sizeof(tmp), fp)) { 1850 char* ptr = tmp; 1851 // skip past whitespace characters 1852 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++; 1853 if (*ptr != '\0') { 1854 char* nl = strchr(ptr, '\n'); 1855 if (nl != NULL) *nl = '\0'; 1856 strncpy(buf, ptr, buflen); 1857 } 1858 } 1859 fclose(fp); 1860 } 1861 } 1862 1863 void os::Solaris::print_libversion_info(outputStream* st) { 1864 st->print(" (T2 libthread)"); 1865 st->cr(); 1866 } 1867 1868 static bool check_addr0(outputStream* st) { 1869 jboolean status = false; 1870 const int read_chunk = 200; 1871 int ret = 0; 1872 int nmap = 0; 1873 int fd = ::open("/proc/self/map",O_RDONLY); 1874 if (fd >= 0) { 1875 prmap_t *p = NULL; 1876 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t)); 1877 if (NULL == mbuff) { 1878 ::close(fd); 1879 return status; 1880 } 1881 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) { 1882 //check if read() has not read partial data 1883 if( 0 != ret % sizeof(prmap_t)){ 1884 break; 1885 } 1886 nmap = ret / sizeof(prmap_t); 1887 p = (prmap_t *)mbuff; 1888 for(int i = 0; i < nmap; i++){ 1889 if (p->pr_vaddr == 0x0) { 1890 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024); 1891 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname); 1892 st->print("Access: "); 1893 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-"); 1894 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-"); 1895 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-"); 1896 st->cr(); 1897 status = true; 1898 } 1899 p++; 1900 } 1901 } 1902 free(mbuff); 1903 ::close(fd); 1904 } 1905 return status; 1906 } 1907 1908 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1909 // Get MHz with system call. We don't seem to already have this. 1910 processor_info_t stats; 1911 processorid_t id = getcpuid(); 1912 int clock = 0; 1913 if (processor_info(id, &stats) != -1) { 1914 clock = stats.pi_clock; // pi_processor_type isn't more informative than below 1915 } 1916 #ifdef AMD64 1917 snprintf(buf, buflen, "x86 64 bit %d MHz", clock); 1918 #else 1919 // must be sparc 1920 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock); 1921 #endif 1922 } 1923 1924 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1925 // Nothing to do for now. 1926 } 1927 1928 void os::print_memory_info(outputStream* st) { 1929 st->print("Memory:"); 1930 st->print(" %dk page", os::vm_page_size()>>10); 1931 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 1932 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 1933 st->cr(); 1934 (void) check_addr0(st); 1935 } 1936 1937 // Moved from whole group, because we need them here for diagnostic 1938 // prints. 1939 #define OLDMAXSIGNUM 32 1940 static int Maxsignum = 0; 1941 static int *ourSigFlags = NULL; 1942 1943 int os::Solaris::get_our_sigflags(int sig) { 1944 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1945 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1946 return ourSigFlags[sig]; 1947 } 1948 1949 void os::Solaris::set_our_sigflags(int sig, int flags) { 1950 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1951 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1952 ourSigFlags[sig] = flags; 1953 } 1954 1955 1956 static const char* get_signal_handler_name(address handler, 1957 char* buf, int buflen) { 1958 int offset; 1959 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 1960 if (found) { 1961 // skip directory names 1962 const char *p1, *p2; 1963 p1 = buf; 1964 size_t len = strlen(os::file_separator()); 1965 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 1966 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 1967 } else { 1968 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 1969 } 1970 return buf; 1971 } 1972 1973 static void print_signal_handler(outputStream* st, int sig, 1974 char* buf, size_t buflen) { 1975 struct sigaction sa; 1976 1977 sigaction(sig, NULL, &sa); 1978 1979 st->print("%s: ", os::exception_name(sig, buf, buflen)); 1980 1981 address handler = (sa.sa_flags & SA_SIGINFO) 1982 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 1983 : CAST_FROM_FN_PTR(address, sa.sa_handler); 1984 1985 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 1986 st->print("SIG_DFL"); 1987 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 1988 st->print("SIG_IGN"); 1989 } else { 1990 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 1991 } 1992 1993 st->print(", sa_mask[0]="); 1994 os::Posix::print_signal_set_short(st, &sa.sa_mask); 1995 1996 address rh = VMError::get_resetted_sighandler(sig); 1997 // May be, handler was resetted by VMError? 1998 if (rh != NULL) { 1999 handler = rh; 2000 sa.sa_flags = VMError::get_resetted_sigflags(sig); 2001 } 2002 2003 st->print(", sa_flags="); 2004 os::Posix::print_sa_flags(st, sa.sa_flags); 2005 2006 // Check: is it our handler? 2007 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) { 2008 // It is our signal handler 2009 // check for flags 2010 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 2011 st->print( 2012 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 2013 os::Solaris::get_our_sigflags(sig)); 2014 } 2015 } 2016 st->cr(); 2017 } 2018 2019 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 2020 st->print_cr("Signal Handlers:"); 2021 print_signal_handler(st, SIGSEGV, buf, buflen); 2022 print_signal_handler(st, SIGBUS , buf, buflen); 2023 print_signal_handler(st, SIGFPE , buf, buflen); 2024 print_signal_handler(st, SIGPIPE, buf, buflen); 2025 print_signal_handler(st, SIGXFSZ, buf, buflen); 2026 print_signal_handler(st, SIGILL , buf, buflen); 2027 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 2028 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 2029 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 2030 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 2031 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 2032 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen); 2033 } 2034 2035 static char saved_jvm_path[MAXPATHLEN] = { 0 }; 2036 2037 // Find the full path to the current module, libjvm.so 2038 void os::jvm_path(char *buf, jint buflen) { 2039 // Error checking. 2040 if (buflen < MAXPATHLEN) { 2041 assert(false, "must use a large-enough buffer"); 2042 buf[0] = '\0'; 2043 return; 2044 } 2045 // Lazy resolve the path to current module. 2046 if (saved_jvm_path[0] != 0) { 2047 strcpy(buf, saved_jvm_path); 2048 return; 2049 } 2050 2051 Dl_info dlinfo; 2052 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 2053 assert(ret != 0, "cannot locate libjvm"); 2054 if (ret != 0 && dlinfo.dli_fname != NULL) { 2055 realpath((char *)dlinfo.dli_fname, buf); 2056 } else { 2057 buf[0] = '\0'; 2058 return; 2059 } 2060 2061 if (Arguments::sun_java_launcher_is_altjvm()) { 2062 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 2063 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". 2064 // If "/jre/lib/" appears at the right place in the string, then 2065 // assume we are installed in a JDK and we're done. Otherwise, check 2066 // for a JAVA_HOME environment variable and fix up the path so it 2067 // looks like libjvm.so is installed there (append a fake suffix 2068 // hotspot/libjvm.so). 2069 const char *p = buf + strlen(buf) - 1; 2070 for (int count = 0; p > buf && count < 5; ++count) { 2071 for (--p; p > buf && *p != '/'; --p) 2072 /* empty */ ; 2073 } 2074 2075 if (strncmp(p, "/jre/lib/", 9) != 0) { 2076 // Look for JAVA_HOME in the environment. 2077 char* java_home_var = ::getenv("JAVA_HOME"); 2078 if (java_home_var != NULL && java_home_var[0] != 0) { 2079 char cpu_arch[12]; 2080 char* jrelib_p; 2081 int len; 2082 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 2083 #ifdef _LP64 2084 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9. 2085 if (strcmp(cpu_arch, "sparc") == 0) { 2086 strcat(cpu_arch, "v9"); 2087 } else if (strcmp(cpu_arch, "i386") == 0) { 2088 strcpy(cpu_arch, "amd64"); 2089 } 2090 #endif 2091 // Check the current module name "libjvm.so". 2092 p = strrchr(buf, '/'); 2093 assert(strstr(p, "/libjvm") == p, "invalid library name"); 2094 2095 realpath(java_home_var, buf); 2096 // determine if this is a legacy image or modules image 2097 // modules image doesn't have "jre" subdirectory 2098 len = strlen(buf); 2099 assert(len < buflen, "Ran out of buffer space"); 2100 jrelib_p = buf + len; 2101 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); 2102 if (0 != access(buf, F_OK)) { 2103 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); 2104 } 2105 2106 if (0 == access(buf, F_OK)) { 2107 // Use current module name "libjvm.so" 2108 len = strlen(buf); 2109 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 2110 } else { 2111 // Go back to path of .so 2112 realpath((char *)dlinfo.dli_fname, buf); 2113 } 2114 } 2115 } 2116 } 2117 2118 strncpy(saved_jvm_path, buf, MAXPATHLEN); 2119 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 2120 } 2121 2122 2123 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2124 // no prefix required, not even "_" 2125 } 2126 2127 2128 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2129 // no suffix required 2130 } 2131 2132 // This method is a copy of JDK's sysGetLastErrorString 2133 // from src/solaris/hpi/src/system_md.c 2134 2135 size_t os::lasterror(char *buf, size_t len) { 2136 if (errno == 0) return 0; 2137 2138 const char *s = os::strerror(errno); 2139 size_t n = ::strlen(s); 2140 if (n >= len) { 2141 n = len - 1; 2142 } 2143 ::strncpy(buf, s, n); 2144 buf[n] = '\0'; 2145 return n; 2146 } 2147 2148 2149 // sun.misc.Signal 2150 2151 extern "C" { 2152 static void UserHandler(int sig, void *siginfo, void *context) { 2153 // Ctrl-C is pressed during error reporting, likely because the error 2154 // handler fails to abort. Let VM die immediately. 2155 if (sig == SIGINT && is_error_reported()) { 2156 os::die(); 2157 } 2158 2159 os::signal_notify(sig); 2160 // We do not need to reinstate the signal handler each time... 2161 } 2162 } 2163 2164 void* os::user_handler() { 2165 return CAST_FROM_FN_PTR(void*, UserHandler); 2166 } 2167 2168 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) { 2169 struct timespec ts; 2170 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 2171 2172 return ts; 2173 } 2174 2175 extern "C" { 2176 typedef void (*sa_handler_t)(int); 2177 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2178 } 2179 2180 void* os::signal(int signal_number, void* handler) { 2181 struct sigaction sigAct, oldSigAct; 2182 sigfillset(&(sigAct.sa_mask)); 2183 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 2184 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2185 2186 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 2187 // -1 means registration failed 2188 return (void *)-1; 2189 } 2190 2191 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2192 } 2193 2194 void os::signal_raise(int signal_number) { 2195 raise(signal_number); 2196 } 2197 2198 // The following code is moved from os.cpp for making this 2199 // code platform specific, which it is by its very nature. 2200 2201 // a counter for each possible signal value 2202 static int Sigexit = 0; 2203 static int Maxlibjsigsigs; 2204 static jint *pending_signals = NULL; 2205 static int *preinstalled_sigs = NULL; 2206 static struct sigaction *chainedsigactions = NULL; 2207 static sema_t sig_sem; 2208 typedef int (*version_getting_t)(); 2209 version_getting_t os::Solaris::get_libjsig_version = NULL; 2210 static int libjsigversion = NULL; 2211 2212 int os::sigexitnum_pd() { 2213 assert(Sigexit > 0, "signal memory not yet initialized"); 2214 return Sigexit; 2215 } 2216 2217 void os::Solaris::init_signal_mem() { 2218 // Initialize signal structures 2219 Maxsignum = SIGRTMAX; 2220 Sigexit = Maxsignum+1; 2221 assert(Maxsignum >0, "Unable to obtain max signal number"); 2222 2223 Maxlibjsigsigs = Maxsignum; 2224 2225 // pending_signals has one int per signal 2226 // The additional signal is for SIGEXIT - exit signal to signal_thread 2227 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); 2228 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 2229 2230 if (UseSignalChaining) { 2231 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 2232 * (Maxsignum + 1), mtInternal); 2233 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 2234 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2235 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 2236 } 2237 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2238 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 2239 } 2240 2241 void os::signal_init_pd() { 2242 int ret; 2243 2244 ret = ::sema_init(&sig_sem, 0, NULL, NULL); 2245 assert(ret == 0, "sema_init() failed"); 2246 } 2247 2248 void os::signal_notify(int signal_number) { 2249 int ret; 2250 2251 Atomic::inc(&pending_signals[signal_number]); 2252 ret = ::sema_post(&sig_sem); 2253 assert(ret == 0, "sema_post() failed"); 2254 } 2255 2256 static int check_pending_signals(bool wait_for_signal) { 2257 int ret; 2258 while (true) { 2259 for (int i = 0; i < Sigexit + 1; i++) { 2260 jint n = pending_signals[i]; 2261 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2262 return i; 2263 } 2264 } 2265 if (!wait_for_signal) { 2266 return -1; 2267 } 2268 JavaThread *thread = JavaThread::current(); 2269 ThreadBlockInVM tbivm(thread); 2270 2271 bool threadIsSuspended; 2272 do { 2273 thread->set_suspend_equivalent(); 2274 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2275 while ((ret = ::sema_wait(&sig_sem)) == EINTR) 2276 ; 2277 assert(ret == 0, "sema_wait() failed"); 2278 2279 // were we externally suspended while we were waiting? 2280 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2281 if (threadIsSuspended) { 2282 // The semaphore has been incremented, but while we were waiting 2283 // another thread suspended us. We don't want to continue running 2284 // while suspended because that would surprise the thread that 2285 // suspended us. 2286 ret = ::sema_post(&sig_sem); 2287 assert(ret == 0, "sema_post() failed"); 2288 2289 thread->java_suspend_self(); 2290 } 2291 } while (threadIsSuspended); 2292 } 2293 } 2294 2295 int os::signal_lookup() { 2296 return check_pending_signals(false); 2297 } 2298 2299 int os::signal_wait() { 2300 return check_pending_signals(true); 2301 } 2302 2303 //////////////////////////////////////////////////////////////////////////////// 2304 // Virtual Memory 2305 2306 static int page_size = -1; 2307 2308 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will 2309 // clear this var if support is not available. 2310 static bool has_map_align = true; 2311 2312 int os::vm_page_size() { 2313 assert(page_size != -1, "must call os::init"); 2314 return page_size; 2315 } 2316 2317 // Solaris allocates memory by pages. 2318 int os::vm_allocation_granularity() { 2319 assert(page_size != -1, "must call os::init"); 2320 return page_size; 2321 } 2322 2323 static bool recoverable_mmap_error(int err) { 2324 // See if the error is one we can let the caller handle. This 2325 // list of errno values comes from the Solaris mmap(2) man page. 2326 switch (err) { 2327 case EBADF: 2328 case EINVAL: 2329 case ENOTSUP: 2330 // let the caller deal with these errors 2331 return true; 2332 2333 default: 2334 // Any remaining errors on this OS can cause our reserved mapping 2335 // to be lost. That can cause confusion where different data 2336 // structures think they have the same memory mapped. The worst 2337 // scenario is if both the VM and a library think they have the 2338 // same memory mapped. 2339 return false; 2340 } 2341 } 2342 2343 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec, 2344 int err) { 2345 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2346 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec, 2347 os::strerror(err), err); 2348 } 2349 2350 static void warn_fail_commit_memory(char* addr, size_t bytes, 2351 size_t alignment_hint, bool exec, 2352 int err) { 2353 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2354 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes, 2355 alignment_hint, exec, os::strerror(err), err); 2356 } 2357 2358 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) { 2359 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2360 size_t size = bytes; 2361 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2362 if (res != NULL) { 2363 if (UseNUMAInterleaving) { 2364 numa_make_global(addr, bytes); 2365 } 2366 return 0; 2367 } 2368 2369 int err = errno; // save errno from mmap() call in mmap_chunk() 2370 2371 if (!recoverable_mmap_error(err)) { 2372 warn_fail_commit_memory(addr, bytes, exec, err); 2373 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory."); 2374 } 2375 2376 return err; 2377 } 2378 2379 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 2380 return Solaris::commit_memory_impl(addr, bytes, exec) == 0; 2381 } 2382 2383 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec, 2384 const char* mesg) { 2385 assert(mesg != NULL, "mesg must be specified"); 2386 int err = os::Solaris::commit_memory_impl(addr, bytes, exec); 2387 if (err != 0) { 2388 // the caller wants all commit errors to exit with the specified mesg: 2389 warn_fail_commit_memory(addr, bytes, exec, err); 2390 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2391 } 2392 } 2393 2394 size_t os::Solaris::page_size_for_alignment(size_t alignment) { 2395 assert(is_size_aligned(alignment, (size_t) vm_page_size()), 2396 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, 2397 alignment, (size_t) vm_page_size()); 2398 2399 for (int i = 0; _page_sizes[i] != 0; i++) { 2400 if (is_size_aligned(alignment, _page_sizes[i])) { 2401 return _page_sizes[i]; 2402 } 2403 } 2404 2405 return (size_t) vm_page_size(); 2406 } 2407 2408 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, 2409 size_t alignment_hint, bool exec) { 2410 int err = Solaris::commit_memory_impl(addr, bytes, exec); 2411 if (err == 0 && UseLargePages && alignment_hint > 0) { 2412 assert(is_size_aligned(bytes, alignment_hint), 2413 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint); 2414 2415 // The syscall memcntl requires an exact page size (see man memcntl for details). 2416 size_t page_size = page_size_for_alignment(alignment_hint); 2417 if (page_size > (size_t) vm_page_size()) { 2418 (void)Solaris::setup_large_pages(addr, bytes, page_size); 2419 } 2420 } 2421 return err; 2422 } 2423 2424 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2425 bool exec) { 2426 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0; 2427 } 2428 2429 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, 2430 size_t alignment_hint, bool exec, 2431 const char* mesg) { 2432 assert(mesg != NULL, "mesg must be specified"); 2433 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec); 2434 if (err != 0) { 2435 // the caller wants all commit errors to exit with the specified mesg: 2436 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err); 2437 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2438 } 2439 } 2440 2441 // Uncommit the pages in a specified region. 2442 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { 2443 if (madvise(addr, bytes, MADV_FREE) < 0) { 2444 debug_only(warning("MADV_FREE failed.")); 2445 return; 2446 } 2447 } 2448 2449 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2450 return os::commit_memory(addr, size, !ExecMem); 2451 } 2452 2453 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2454 return os::uncommit_memory(addr, size); 2455 } 2456 2457 // Change the page size in a given range. 2458 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2459 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2460 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2461 if (UseLargePages) { 2462 size_t page_size = Solaris::page_size_for_alignment(alignment_hint); 2463 if (page_size > (size_t) vm_page_size()) { 2464 Solaris::setup_large_pages(addr, bytes, page_size); 2465 } 2466 } 2467 } 2468 2469 // Tell the OS to make the range local to the first-touching LWP 2470 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2471 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2472 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2473 debug_only(warning("MADV_ACCESS_LWP failed.")); 2474 } 2475 } 2476 2477 // Tell the OS that this range would be accessed from different LWPs. 2478 void os::numa_make_global(char *addr, size_t bytes) { 2479 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2480 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2481 debug_only(warning("MADV_ACCESS_MANY failed.")); 2482 } 2483 } 2484 2485 // Get the number of the locality groups. 2486 size_t os::numa_get_groups_num() { 2487 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2488 return n != -1 ? n : 1; 2489 } 2490 2491 // Get a list of leaf locality groups. A leaf lgroup is group that 2492 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2493 // board. An LWP is assigned to one of these groups upon creation. 2494 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2495 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2496 ids[0] = 0; 2497 return 1; 2498 } 2499 int result_size = 0, top = 1, bottom = 0, cur = 0; 2500 for (int k = 0; k < size; k++) { 2501 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2502 (Solaris::lgrp_id_t*)&ids[top], size - top); 2503 if (r == -1) { 2504 ids[0] = 0; 2505 return 1; 2506 } 2507 if (!r) { 2508 // That's a leaf node. 2509 assert(bottom <= cur, "Sanity check"); 2510 // Check if the node has memory 2511 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2512 NULL, 0, LGRP_RSRC_MEM) > 0) { 2513 ids[bottom++] = ids[cur]; 2514 } 2515 } 2516 top += r; 2517 cur++; 2518 } 2519 if (bottom == 0) { 2520 // Handle a situation, when the OS reports no memory available. 2521 // Assume UMA architecture. 2522 ids[0] = 0; 2523 return 1; 2524 } 2525 return bottom; 2526 } 2527 2528 // Detect the topology change. Typically happens during CPU plugging-unplugging. 2529 bool os::numa_topology_changed() { 2530 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2531 if (is_stale != -1 && is_stale) { 2532 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2533 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2534 assert(c != 0, "Failure to initialize LGRP API"); 2535 Solaris::set_lgrp_cookie(c); 2536 return true; 2537 } 2538 return false; 2539 } 2540 2541 // Get the group id of the current LWP. 2542 int os::numa_get_group_id() { 2543 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2544 if (lgrp_id == -1) { 2545 return 0; 2546 } 2547 const int size = os::numa_get_groups_num(); 2548 int *ids = (int*)alloca(size * sizeof(int)); 2549 2550 // Get the ids of all lgroups with memory; r is the count. 2551 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2552 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2553 if (r <= 0) { 2554 return 0; 2555 } 2556 return ids[os::random() % r]; 2557 } 2558 2559 // Request information about the page. 2560 bool os::get_page_info(char *start, page_info* info) { 2561 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2562 uint64_t addr = (uintptr_t)start; 2563 uint64_t outdata[2]; 2564 uint_t validity = 0; 2565 2566 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2567 return false; 2568 } 2569 2570 info->size = 0; 2571 info->lgrp_id = -1; 2572 2573 if ((validity & 1) != 0) { 2574 if ((validity & 2) != 0) { 2575 info->lgrp_id = outdata[0]; 2576 } 2577 if ((validity & 4) != 0) { 2578 info->size = outdata[1]; 2579 } 2580 return true; 2581 } 2582 return false; 2583 } 2584 2585 // Scan the pages from start to end until a page different than 2586 // the one described in the info parameter is encountered. 2587 char *os::scan_pages(char *start, char* end, page_info* page_expected, 2588 page_info* page_found) { 2589 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2590 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2591 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1]; 2592 uint_t validity[MAX_MEMINFO_CNT]; 2593 2594 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2595 uint64_t p = (uint64_t)start; 2596 while (p < (uint64_t)end) { 2597 addrs[0] = p; 2598 size_t addrs_count = 1; 2599 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { 2600 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2601 addrs_count++; 2602 } 2603 2604 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2605 return NULL; 2606 } 2607 2608 size_t i = 0; 2609 for (; i < addrs_count; i++) { 2610 if ((validity[i] & 1) != 0) { 2611 if ((validity[i] & 4) != 0) { 2612 if (outdata[types * i + 1] != page_expected->size) { 2613 break; 2614 } 2615 } else if (page_expected->size != 0) { 2616 break; 2617 } 2618 2619 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2620 if (outdata[types * i] != page_expected->lgrp_id) { 2621 break; 2622 } 2623 } 2624 } else { 2625 return NULL; 2626 } 2627 } 2628 2629 if (i < addrs_count) { 2630 if ((validity[i] & 2) != 0) { 2631 page_found->lgrp_id = outdata[types * i]; 2632 } else { 2633 page_found->lgrp_id = -1; 2634 } 2635 if ((validity[i] & 4) != 0) { 2636 page_found->size = outdata[types * i + 1]; 2637 } else { 2638 page_found->size = 0; 2639 } 2640 return (char*)addrs[i]; 2641 } 2642 2643 p = addrs[addrs_count - 1] + page_size; 2644 } 2645 return end; 2646 } 2647 2648 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 2649 size_t size = bytes; 2650 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2651 // uncommitted page. Otherwise, the read/write might succeed if we 2652 // have enough swap space to back the physical page. 2653 return 2654 NULL != Solaris::mmap_chunk(addr, size, 2655 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2656 PROT_NONE); 2657 } 2658 2659 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2660 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2661 2662 if (b == MAP_FAILED) { 2663 return NULL; 2664 } 2665 return b; 2666 } 2667 2668 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, 2669 size_t alignment_hint, bool fixed) { 2670 char* addr = requested_addr; 2671 int flags = MAP_PRIVATE | MAP_NORESERVE; 2672 2673 assert(!(fixed && (alignment_hint > 0)), 2674 "alignment hint meaningless with fixed mmap"); 2675 2676 if (fixed) { 2677 flags |= MAP_FIXED; 2678 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) { 2679 flags |= MAP_ALIGN; 2680 addr = (char*) alignment_hint; 2681 } 2682 2683 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2684 // uncommitted page. Otherwise, the read/write might succeed if we 2685 // have enough swap space to back the physical page. 2686 return mmap_chunk(addr, bytes, flags, PROT_NONE); 2687 } 2688 2689 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2690 size_t alignment_hint) { 2691 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, 2692 (requested_addr != NULL)); 2693 2694 guarantee(requested_addr == NULL || requested_addr == addr, 2695 "OS failed to return requested mmap address."); 2696 return addr; 2697 } 2698 2699 // Reserve memory at an arbitrary address, only if that area is 2700 // available (and not reserved for something else). 2701 2702 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2703 const int max_tries = 10; 2704 char* base[max_tries]; 2705 size_t size[max_tries]; 2706 2707 // Solaris adds a gap between mmap'ed regions. The size of the gap 2708 // is dependent on the requested size and the MMU. Our initial gap 2709 // value here is just a guess and will be corrected later. 2710 bool had_top_overlap = false; 2711 bool have_adjusted_gap = false; 2712 size_t gap = 0x400000; 2713 2714 // Assert only that the size is a multiple of the page size, since 2715 // that's all that mmap requires, and since that's all we really know 2716 // about at this low abstraction level. If we need higher alignment, 2717 // we can either pass an alignment to this method or verify alignment 2718 // in one of the methods further up the call chain. See bug 5044738. 2719 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2720 2721 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 2722 // Give it a try, if the kernel honors the hint we can return immediately. 2723 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 2724 2725 volatile int err = errno; 2726 if (addr == requested_addr) { 2727 return addr; 2728 } else if (addr != NULL) { 2729 pd_unmap_memory(addr, bytes); 2730 } 2731 2732 if (log_is_enabled(Warning, os)) { 2733 char buf[256]; 2734 buf[0] = '\0'; 2735 if (addr == NULL) { 2736 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err)); 2737 } 2738 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at " 2739 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT 2740 "%s", bytes, requested_addr, addr, buf); 2741 } 2742 2743 // Address hint method didn't work. Fall back to the old method. 2744 // In theory, once SNV becomes our oldest supported platform, this 2745 // code will no longer be needed. 2746 // 2747 // Repeatedly allocate blocks until the block is allocated at the 2748 // right spot. Give up after max_tries. 2749 int i; 2750 for (i = 0; i < max_tries; ++i) { 2751 base[i] = reserve_memory(bytes); 2752 2753 if (base[i] != NULL) { 2754 // Is this the block we wanted? 2755 if (base[i] == requested_addr) { 2756 size[i] = bytes; 2757 break; 2758 } 2759 2760 // check that the gap value is right 2761 if (had_top_overlap && !have_adjusted_gap) { 2762 size_t actual_gap = base[i-1] - base[i] - bytes; 2763 if (gap != actual_gap) { 2764 // adjust the gap value and retry the last 2 allocations 2765 assert(i > 0, "gap adjustment code problem"); 2766 have_adjusted_gap = true; // adjust the gap only once, just in case 2767 gap = actual_gap; 2768 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap); 2769 unmap_memory(base[i], bytes); 2770 unmap_memory(base[i-1], size[i-1]); 2771 i-=2; 2772 continue; 2773 } 2774 } 2775 2776 // Does this overlap the block we wanted? Give back the overlapped 2777 // parts and try again. 2778 // 2779 // There is still a bug in this code: if top_overlap == bytes, 2780 // the overlap is offset from requested region by the value of gap. 2781 // In this case giving back the overlapped part will not work, 2782 // because we'll give back the entire block at base[i] and 2783 // therefore the subsequent allocation will not generate a new gap. 2784 // This could be fixed with a new algorithm that used larger 2785 // or variable size chunks to find the requested region - 2786 // but such a change would introduce additional complications. 2787 // It's rare enough that the planets align for this bug, 2788 // so we'll just wait for a fix for 6204603/5003415 which 2789 // will provide a mmap flag to allow us to avoid this business. 2790 2791 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2792 if (top_overlap >= 0 && top_overlap < bytes) { 2793 had_top_overlap = true; 2794 unmap_memory(base[i], top_overlap); 2795 base[i] += top_overlap; 2796 size[i] = bytes - top_overlap; 2797 } else { 2798 size_t bottom_overlap = base[i] + bytes - requested_addr; 2799 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2800 if (bottom_overlap == 0) { 2801 log_info(os)("attempt_reserve_memory_at: possible alignment bug"); 2802 } 2803 unmap_memory(requested_addr, bottom_overlap); 2804 size[i] = bytes - bottom_overlap; 2805 } else { 2806 size[i] = bytes; 2807 } 2808 } 2809 } 2810 } 2811 2812 // Give back the unused reserved pieces. 2813 2814 for (int j = 0; j < i; ++j) { 2815 if (base[j] != NULL) { 2816 unmap_memory(base[j], size[j]); 2817 } 2818 } 2819 2820 return (i < max_tries) ? requested_addr : NULL; 2821 } 2822 2823 bool os::pd_release_memory(char* addr, size_t bytes) { 2824 size_t size = bytes; 2825 return munmap(addr, size) == 0; 2826 } 2827 2828 static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 2829 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()), 2830 "addr must be page aligned"); 2831 int retVal = mprotect(addr, bytes, prot); 2832 return retVal == 0; 2833 } 2834 2835 // Protect memory (Used to pass readonly pages through 2836 // JNI GetArray<type>Elements with empty arrays.) 2837 // Also, used for serialization page and for compressed oops null pointer 2838 // checking. 2839 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2840 bool is_committed) { 2841 unsigned int p = 0; 2842 switch (prot) { 2843 case MEM_PROT_NONE: p = PROT_NONE; break; 2844 case MEM_PROT_READ: p = PROT_READ; break; 2845 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2846 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2847 default: 2848 ShouldNotReachHere(); 2849 } 2850 // is_committed is unused. 2851 return solaris_mprotect(addr, bytes, p); 2852 } 2853 2854 // guard_memory and unguard_memory only happens within stack guard pages. 2855 // Since ISM pertains only to the heap, guard and unguard memory should not 2856 /// happen with an ISM region. 2857 bool os::guard_memory(char* addr, size_t bytes) { 2858 return solaris_mprotect(addr, bytes, PROT_NONE); 2859 } 2860 2861 bool os::unguard_memory(char* addr, size_t bytes) { 2862 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 2863 } 2864 2865 // Large page support 2866 static size_t _large_page_size = 0; 2867 2868 // Insertion sort for small arrays (descending order). 2869 static void insertion_sort_descending(size_t* array, int len) { 2870 for (int i = 0; i < len; i++) { 2871 size_t val = array[i]; 2872 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 2873 size_t tmp = array[key]; 2874 array[key] = array[key - 1]; 2875 array[key - 1] = tmp; 2876 } 2877 } 2878 } 2879 2880 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) { 2881 const unsigned int usable_count = VM_Version::page_size_count(); 2882 if (usable_count == 1) { 2883 return false; 2884 } 2885 2886 // Find the right getpagesizes interface. When solaris 11 is the minimum 2887 // build platform, getpagesizes() (without the '2') can be called directly. 2888 typedef int (*gps_t)(size_t[], int); 2889 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); 2890 if (gps_func == NULL) { 2891 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); 2892 if (gps_func == NULL) { 2893 if (warn) { 2894 warning("MPSS is not supported by the operating system."); 2895 } 2896 return false; 2897 } 2898 } 2899 2900 // Fill the array of page sizes. 2901 int n = (*gps_func)(_page_sizes, page_sizes_max); 2902 assert(n > 0, "Solaris bug?"); 2903 2904 if (n == page_sizes_max) { 2905 // Add a sentinel value (necessary only if the array was completely filled 2906 // since it is static (zeroed at initialization)). 2907 _page_sizes[--n] = 0; 2908 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 2909 } 2910 assert(_page_sizes[n] == 0, "missing sentinel"); 2911 trace_page_sizes("available page sizes", _page_sizes, n); 2912 2913 if (n == 1) return false; // Only one page size available. 2914 2915 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 2916 // select up to usable_count elements. First sort the array, find the first 2917 // acceptable value, then copy the usable sizes to the top of the array and 2918 // trim the rest. Make sure to include the default page size :-). 2919 // 2920 // A better policy could get rid of the 4M limit by taking the sizes of the 2921 // important VM memory regions (java heap and possibly the code cache) into 2922 // account. 2923 insertion_sort_descending(_page_sizes, n); 2924 const size_t size_limit = 2925 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 2926 int beg; 2927 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */; 2928 const int end = MIN2((int)usable_count, n) - 1; 2929 for (int cur = 0; cur < end; ++cur, ++beg) { 2930 _page_sizes[cur] = _page_sizes[beg]; 2931 } 2932 _page_sizes[end] = vm_page_size(); 2933 _page_sizes[end + 1] = 0; 2934 2935 if (_page_sizes[end] > _page_sizes[end - 1]) { 2936 // Default page size is not the smallest; sort again. 2937 insertion_sort_descending(_page_sizes, end + 1); 2938 } 2939 *page_size = _page_sizes[0]; 2940 2941 trace_page_sizes("usable page sizes", _page_sizes, end + 1); 2942 return true; 2943 } 2944 2945 void os::large_page_init() { 2946 if (UseLargePages) { 2947 // print a warning if any large page related flag is specified on command line 2948 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2949 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2950 2951 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 2952 } 2953 } 2954 2955 bool os::Solaris::is_valid_page_size(size_t bytes) { 2956 for (int i = 0; _page_sizes[i] != 0; i++) { 2957 if (_page_sizes[i] == bytes) { 2958 return true; 2959 } 2960 } 2961 return false; 2962 } 2963 2964 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) { 2965 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align); 2966 assert(is_ptr_aligned((void*) start, align), 2967 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align); 2968 assert(is_size_aligned(bytes, align), 2969 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align); 2970 2971 // Signal to OS that we want large pages for addresses 2972 // from addr, addr + bytes 2973 struct memcntl_mha mpss_struct; 2974 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 2975 mpss_struct.mha_pagesize = align; 2976 mpss_struct.mha_flags = 0; 2977 // Upon successful completion, memcntl() returns 0 2978 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) { 2979 debug_only(warning("Attempt to use MPSS failed.")); 2980 return false; 2981 } 2982 return true; 2983 } 2984 2985 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) { 2986 fatal("os::reserve_memory_special should not be called on Solaris."); 2987 return NULL; 2988 } 2989 2990 bool os::release_memory_special(char* base, size_t bytes) { 2991 fatal("os::release_memory_special should not be called on Solaris."); 2992 return false; 2993 } 2994 2995 size_t os::large_page_size() { 2996 return _large_page_size; 2997 } 2998 2999 // MPSS allows application to commit large page memory on demand; with ISM 3000 // the entire memory region must be allocated as shared memory. 3001 bool os::can_commit_large_page_memory() { 3002 return true; 3003 } 3004 3005 bool os::can_execute_large_page_memory() { 3006 return true; 3007 } 3008 3009 // Read calls from inside the vm need to perform state transitions 3010 size_t os::read(int fd, void *buf, unsigned int nBytes) { 3011 size_t res; 3012 JavaThread* thread = (JavaThread*)Thread::current(); 3013 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 3014 ThreadBlockInVM tbiv(thread); 3015 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 3016 return res; 3017 } 3018 3019 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 3020 size_t res; 3021 JavaThread* thread = (JavaThread*)Thread::current(); 3022 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 3023 ThreadBlockInVM tbiv(thread); 3024 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res); 3025 return res; 3026 } 3027 3028 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) { 3029 size_t res; 3030 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 3031 "Assumed _thread_in_native"); 3032 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 3033 return res; 3034 } 3035 3036 void os::naked_short_sleep(jlong ms) { 3037 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3038 3039 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but 3040 // Solaris requires -lrt for this. 3041 usleep((ms * 1000)); 3042 3043 return; 3044 } 3045 3046 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3047 void os::infinite_sleep() { 3048 while (true) { // sleep forever ... 3049 ::sleep(100); // ... 100 seconds at a time 3050 } 3051 } 3052 3053 // Used to convert frequent JVM_Yield() to nops 3054 bool os::dont_yield() { 3055 if (DontYieldALot) { 3056 static hrtime_t last_time = 0; 3057 hrtime_t diff = getTimeNanos() - last_time; 3058 3059 if (diff < DontYieldALotInterval * 1000000) { 3060 return true; 3061 } 3062 3063 last_time += diff; 3064 3065 return false; 3066 } else { 3067 return false; 3068 } 3069 } 3070 3071 // Note that yield semantics are defined by the scheduling class to which 3072 // the thread currently belongs. Typically, yield will _not yield to 3073 // other equal or higher priority threads that reside on the dispatch queues 3074 // of other CPUs. 3075 3076 void os::naked_yield() { 3077 thr_yield(); 3078 } 3079 3080 // Interface for setting lwp priorities. If we are using T2 libthread, 3081 // which forces the use of BoundThreads or we manually set UseBoundThreads, 3082 // all of our threads will be assigned to real lwp's. Using the thr_setprio 3083 // function is meaningless in this mode so we must adjust the real lwp's priority 3084 // The routines below implement the getting and setting of lwp priorities. 3085 // 3086 // Note: T2 is now the only supported libthread. UseBoundThreads flag is 3087 // being deprecated and all threads are now BoundThreads 3088 // 3089 // Note: There are three priority scales used on Solaris. Java priotities 3090 // which range from 1 to 10, libthread "thr_setprio" scale which range 3091 // from 0 to 127, and the current scheduling class of the process we 3092 // are running in. This is typically from -60 to +60. 3093 // The setting of the lwp priorities in done after a call to thr_setprio 3094 // so Java priorities are mapped to libthread priorities and we map from 3095 // the latter to lwp priorities. We don't keep priorities stored in 3096 // Java priorities since some of our worker threads want to set priorities 3097 // higher than all Java threads. 3098 // 3099 // For related information: 3100 // (1) man -s 2 priocntl 3101 // (2) man -s 4 priocntl 3102 // (3) man dispadmin 3103 // = librt.so 3104 // = libthread/common/rtsched.c - thrp_setlwpprio(). 3105 // = ps -cL <pid> ... to validate priority. 3106 // = sched_get_priority_min and _max 3107 // pthread_create 3108 // sched_setparam 3109 // pthread_setschedparam 3110 // 3111 // Assumptions: 3112 // + We assume that all threads in the process belong to the same 3113 // scheduling class. IE. an homogenous process. 3114 // + Must be root or in IA group to change change "interactive" attribute. 3115 // Priocntl() will fail silently. The only indication of failure is when 3116 // we read-back the value and notice that it hasn't changed. 3117 // + Interactive threads enter the runq at the head, non-interactive at the tail. 3118 // + For RT, change timeslice as well. Invariant: 3119 // constant "priority integral" 3120 // Konst == TimeSlice * (60-Priority) 3121 // Given a priority, compute appropriate timeslice. 3122 // + Higher numerical values have higher priority. 3123 3124 // sched class attributes 3125 typedef struct { 3126 int schedPolicy; // classID 3127 int maxPrio; 3128 int minPrio; 3129 } SchedInfo; 3130 3131 3132 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; 3133 3134 #ifdef ASSERT 3135 static int ReadBackValidate = 1; 3136 #endif 3137 static int myClass = 0; 3138 static int myMin = 0; 3139 static int myMax = 0; 3140 static int myCur = 0; 3141 static bool priocntl_enable = false; 3142 3143 static const int criticalPrio = FXCriticalPriority; 3144 static int java_MaxPriority_to_os_priority = 0; // Saved mapping 3145 3146 3147 // lwp_priocntl_init 3148 // 3149 // Try to determine the priority scale for our process. 3150 // 3151 // Return errno or 0 if OK. 3152 // 3153 static int lwp_priocntl_init() { 3154 int rslt; 3155 pcinfo_t ClassInfo; 3156 pcparms_t ParmInfo; 3157 int i; 3158 3159 if (!UseThreadPriorities) return 0; 3160 3161 // If ThreadPriorityPolicy is 1, switch tables 3162 if (ThreadPriorityPolicy == 1) { 3163 for (i = 0; i < CriticalPriority+1; i++) 3164 os::java_to_os_priority[i] = prio_policy1[i]; 3165 } 3166 if (UseCriticalJavaThreadPriority) { 3167 // MaxPriority always maps to the FX scheduling class and criticalPrio. 3168 // See set_native_priority() and set_lwp_class_and_priority(). 3169 // Save original MaxPriority mapping in case attempt to 3170 // use critical priority fails. 3171 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; 3172 // Set negative to distinguish from other priorities 3173 os::java_to_os_priority[MaxPriority] = -criticalPrio; 3174 } 3175 3176 // Get IDs for a set of well-known scheduling classes. 3177 // TODO-FIXME: GETCLINFO returns the current # of classes in the 3178 // the system. We should have a loop that iterates over the 3179 // classID values, which are known to be "small" integers. 3180 3181 strcpy(ClassInfo.pc_clname, "TS"); 3182 ClassInfo.pc_cid = -1; 3183 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3184 if (rslt < 0) return errno; 3185 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 3186 tsLimits.schedPolicy = ClassInfo.pc_cid; 3187 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 3188 tsLimits.minPrio = -tsLimits.maxPrio; 3189 3190 strcpy(ClassInfo.pc_clname, "IA"); 3191 ClassInfo.pc_cid = -1; 3192 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3193 if (rslt < 0) return errno; 3194 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 3195 iaLimits.schedPolicy = ClassInfo.pc_cid; 3196 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 3197 iaLimits.minPrio = -iaLimits.maxPrio; 3198 3199 strcpy(ClassInfo.pc_clname, "RT"); 3200 ClassInfo.pc_cid = -1; 3201 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3202 if (rslt < 0) return errno; 3203 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 3204 rtLimits.schedPolicy = ClassInfo.pc_cid; 3205 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 3206 rtLimits.minPrio = 0; 3207 3208 strcpy(ClassInfo.pc_clname, "FX"); 3209 ClassInfo.pc_cid = -1; 3210 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3211 if (rslt < 0) return errno; 3212 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); 3213 fxLimits.schedPolicy = ClassInfo.pc_cid; 3214 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; 3215 fxLimits.minPrio = 0; 3216 3217 // Query our "current" scheduling class. 3218 // This will normally be IA, TS or, rarely, FX or RT. 3219 memset(&ParmInfo, 0, sizeof(ParmInfo)); 3220 ParmInfo.pc_cid = PC_CLNULL; 3221 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3222 if (rslt < 0) return errno; 3223 myClass = ParmInfo.pc_cid; 3224 3225 // We now know our scheduling classId, get specific information 3226 // about the class. 3227 ClassInfo.pc_cid = myClass; 3228 ClassInfo.pc_clname[0] = 0; 3229 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); 3230 if (rslt < 0) return errno; 3231 3232 if (ThreadPriorityVerbose) { 3233 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 3234 } 3235 3236 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3237 ParmInfo.pc_cid = PC_CLNULL; 3238 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3239 if (rslt < 0) return errno; 3240 3241 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3242 myMin = rtLimits.minPrio; 3243 myMax = rtLimits.maxPrio; 3244 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3245 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3246 myMin = iaLimits.minPrio; 3247 myMax = iaLimits.maxPrio; 3248 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 3249 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3250 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3251 myMin = tsLimits.minPrio; 3252 myMax = tsLimits.maxPrio; 3253 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 3254 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3255 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3256 myMin = fxLimits.minPrio; 3257 myMax = fxLimits.maxPrio; 3258 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict 3259 } else { 3260 // No clue - punt 3261 if (ThreadPriorityVerbose) { 3262 tty->print_cr("Unknown scheduling class: %s ... \n", 3263 ClassInfo.pc_clname); 3264 } 3265 return EINVAL; // no clue, punt 3266 } 3267 3268 if (ThreadPriorityVerbose) { 3269 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax); 3270 } 3271 3272 priocntl_enable = true; // Enable changing priorities 3273 return 0; 3274 } 3275 3276 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 3277 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 3278 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 3279 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) 3280 3281 3282 // scale_to_lwp_priority 3283 // 3284 // Convert from the libthread "thr_setprio" scale to our current 3285 // lwp scheduling class scale. 3286 // 3287 static int scale_to_lwp_priority(int rMin, int rMax, int x) { 3288 int v; 3289 3290 if (x == 127) return rMax; // avoid round-down 3291 v = (((x*(rMax-rMin)))/128)+rMin; 3292 return v; 3293 } 3294 3295 3296 // set_lwp_class_and_priority 3297 int set_lwp_class_and_priority(int ThreadID, int lwpid, 3298 int newPrio, int new_class, bool scale) { 3299 int rslt; 3300 int Actual, Expected, prv; 3301 pcparms_t ParmInfo; // for GET-SET 3302 #ifdef ASSERT 3303 pcparms_t ReadBack; // for readback 3304 #endif 3305 3306 // Set priority via PC_GETPARMS, update, PC_SETPARMS 3307 // Query current values. 3308 // TODO: accelerate this by eliminating the PC_GETPARMS call. 3309 // Cache "pcparms_t" in global ParmCache. 3310 // TODO: elide set-to-same-value 3311 3312 // If something went wrong on init, don't change priorities. 3313 if (!priocntl_enable) { 3314 if (ThreadPriorityVerbose) { 3315 tty->print_cr("Trying to set priority but init failed, ignoring"); 3316 } 3317 return EINVAL; 3318 } 3319 3320 // If lwp hasn't started yet, just return 3321 // the _start routine will call us again. 3322 if (lwpid <= 0) { 3323 if (ThreadPriorityVerbose) { 3324 tty->print_cr("deferring the set_lwp_class_and_priority of thread " 3325 INTPTR_FORMAT " to %d, lwpid not set", 3326 ThreadID, newPrio); 3327 } 3328 return 0; 3329 } 3330 3331 if (ThreadPriorityVerbose) { 3332 tty->print_cr ("set_lwp_class_and_priority(" 3333 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 3334 ThreadID, lwpid, newPrio); 3335 } 3336 3337 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3338 ParmInfo.pc_cid = PC_CLNULL; 3339 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 3340 if (rslt < 0) return errno; 3341 3342 int cur_class = ParmInfo.pc_cid; 3343 ParmInfo.pc_cid = (id_t)new_class; 3344 3345 if (new_class == rtLimits.schedPolicy) { 3346 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 3347 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, 3348 rtLimits.maxPrio, newPrio) 3349 : newPrio; 3350 rtInfo->rt_tqsecs = RT_NOCHANGE; 3351 rtInfo->rt_tqnsecs = RT_NOCHANGE; 3352 if (ThreadPriorityVerbose) { 3353 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 3354 } 3355 } else if (new_class == iaLimits.schedPolicy) { 3356 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3357 int maxClamped = MIN2(iaLimits.maxPrio, 3358 cur_class == new_class 3359 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); 3360 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, 3361 maxClamped, newPrio) 3362 : newPrio; 3363 iaInfo->ia_uprilim = cur_class == new_class 3364 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; 3365 iaInfo->ia_mode = IA_NOCHANGE; 3366 if (ThreadPriorityVerbose) { 3367 tty->print_cr("IA: [%d...%d] %d->%d\n", 3368 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 3369 } 3370 } else if (new_class == tsLimits.schedPolicy) { 3371 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3372 int maxClamped = MIN2(tsLimits.maxPrio, 3373 cur_class == new_class 3374 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); 3375 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, 3376 maxClamped, newPrio) 3377 : newPrio; 3378 tsInfo->ts_uprilim = cur_class == new_class 3379 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; 3380 if (ThreadPriorityVerbose) { 3381 tty->print_cr("TS: [%d...%d] %d->%d\n", 3382 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 3383 } 3384 } else if (new_class == fxLimits.schedPolicy) { 3385 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3386 int maxClamped = MIN2(fxLimits.maxPrio, 3387 cur_class == new_class 3388 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); 3389 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, 3390 maxClamped, newPrio) 3391 : newPrio; 3392 fxInfo->fx_uprilim = cur_class == new_class 3393 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; 3394 fxInfo->fx_tqsecs = FX_NOCHANGE; 3395 fxInfo->fx_tqnsecs = FX_NOCHANGE; 3396 if (ThreadPriorityVerbose) { 3397 tty->print_cr("FX: [%d...%d] %d->%d\n", 3398 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); 3399 } 3400 } else { 3401 if (ThreadPriorityVerbose) { 3402 tty->print_cr("Unknown new scheduling class %d\n", new_class); 3403 } 3404 return EINVAL; // no clue, punt 3405 } 3406 3407 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 3408 if (ThreadPriorityVerbose && rslt) { 3409 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 3410 } 3411 if (rslt < 0) return errno; 3412 3413 #ifdef ASSERT 3414 // Sanity check: read back what we just attempted to set. 3415 // In theory it could have changed in the interim ... 3416 // 3417 // The priocntl system call is tricky. 3418 // Sometimes it'll validate the priority value argument and 3419 // return EINVAL if unhappy. At other times it fails silently. 3420 // Readbacks are prudent. 3421 3422 if (!ReadBackValidate) return 0; 3423 3424 memset(&ReadBack, 0, sizeof(pcparms_t)); 3425 ReadBack.pc_cid = PC_CLNULL; 3426 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 3427 assert(rslt >= 0, "priocntl failed"); 3428 Actual = Expected = 0xBAD; 3429 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3430 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3431 Actual = RTPRI(ReadBack)->rt_pri; 3432 Expected = RTPRI(ParmInfo)->rt_pri; 3433 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3434 Actual = IAPRI(ReadBack)->ia_upri; 3435 Expected = IAPRI(ParmInfo)->ia_upri; 3436 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3437 Actual = TSPRI(ReadBack)->ts_upri; 3438 Expected = TSPRI(ParmInfo)->ts_upri; 3439 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3440 Actual = FXPRI(ReadBack)->fx_upri; 3441 Expected = FXPRI(ParmInfo)->fx_upri; 3442 } else { 3443 if (ThreadPriorityVerbose) { 3444 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", 3445 ParmInfo.pc_cid); 3446 } 3447 } 3448 3449 if (Actual != Expected) { 3450 if (ThreadPriorityVerbose) { 3451 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 3452 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 3453 } 3454 } 3455 #endif 3456 3457 return 0; 3458 } 3459 3460 // Solaris only gives access to 128 real priorities at a time, 3461 // so we expand Java's ten to fill this range. This would be better 3462 // if we dynamically adjusted relative priorities. 3463 // 3464 // The ThreadPriorityPolicy option allows us to select 2 different 3465 // priority scales. 3466 // 3467 // ThreadPriorityPolicy=0 3468 // Since the Solaris' default priority is MaximumPriority, we do not 3469 // set a priority lower than Max unless a priority lower than 3470 // NormPriority is requested. 3471 // 3472 // ThreadPriorityPolicy=1 3473 // This mode causes the priority table to get filled with 3474 // linear values. NormPriority get's mapped to 50% of the 3475 // Maximum priority an so on. This will cause VM threads 3476 // to get unfair treatment against other Solaris processes 3477 // which do not explicitly alter their thread priorities. 3478 3479 int os::java_to_os_priority[CriticalPriority + 1] = { 3480 -99999, // 0 Entry should never be used 3481 3482 0, // 1 MinPriority 3483 32, // 2 3484 64, // 3 3485 3486 96, // 4 3487 127, // 5 NormPriority 3488 127, // 6 3489 3490 127, // 7 3491 127, // 8 3492 127, // 9 NearMaxPriority 3493 3494 127, // 10 MaxPriority 3495 3496 -criticalPrio // 11 CriticalPriority 3497 }; 3498 3499 OSReturn os::set_native_priority(Thread* thread, int newpri) { 3500 OSThread* osthread = thread->osthread(); 3501 3502 // Save requested priority in case the thread hasn't been started 3503 osthread->set_native_priority(newpri); 3504 3505 // Check for critical priority request 3506 bool fxcritical = false; 3507 if (newpri == -criticalPrio) { 3508 fxcritical = true; 3509 newpri = criticalPrio; 3510 } 3511 3512 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 3513 if (!UseThreadPriorities) return OS_OK; 3514 3515 int status = 0; 3516 3517 if (!fxcritical) { 3518 // Use thr_setprio only if we have a priority that thr_setprio understands 3519 status = thr_setprio(thread->osthread()->thread_id(), newpri); 3520 } 3521 3522 int lwp_status = 3523 set_lwp_class_and_priority(osthread->thread_id(), 3524 osthread->lwp_id(), 3525 newpri, 3526 fxcritical ? fxLimits.schedPolicy : myClass, 3527 !fxcritical); 3528 if (lwp_status != 0 && fxcritical) { 3529 // Try again, this time without changing the scheduling class 3530 newpri = java_MaxPriority_to_os_priority; 3531 lwp_status = set_lwp_class_and_priority(osthread->thread_id(), 3532 osthread->lwp_id(), 3533 newpri, myClass, false); 3534 } 3535 status |= lwp_status; 3536 return (status == 0) ? OS_OK : OS_ERR; 3537 } 3538 3539 3540 OSReturn os::get_native_priority(const Thread* const thread, 3541 int *priority_ptr) { 3542 int p; 3543 if (!UseThreadPriorities) { 3544 *priority_ptr = NormalPriority; 3545 return OS_OK; 3546 } 3547 int status = thr_getprio(thread->osthread()->thread_id(), &p); 3548 if (status != 0) { 3549 return OS_ERR; 3550 } 3551 *priority_ptr = p; 3552 return OS_OK; 3553 } 3554 3555 3556 // Hint to the underlying OS that a task switch would not be good. 3557 // Void return because it's a hint and can fail. 3558 void os::hint_no_preempt() { 3559 schedctl_start(schedctl_init()); 3560 } 3561 3562 static void resume_clear_context(OSThread *osthread) { 3563 osthread->set_ucontext(NULL); 3564 } 3565 3566 static void suspend_save_context(OSThread *osthread, ucontext_t* context) { 3567 osthread->set_ucontext(context); 3568 } 3569 3570 static PosixSemaphore sr_semaphore; 3571 3572 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) { 3573 // Save and restore errno to avoid confusing native code with EINTR 3574 // after sigsuspend. 3575 int old_errno = errno; 3576 3577 OSThread* osthread = thread->osthread(); 3578 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 3579 3580 os::SuspendResume::State current = osthread->sr.state(); 3581 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 3582 suspend_save_context(osthread, uc); 3583 3584 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 3585 os::SuspendResume::State state = osthread->sr.suspended(); 3586 if (state == os::SuspendResume::SR_SUSPENDED) { 3587 sigset_t suspend_set; // signals for sigsuspend() 3588 3589 // get current set of blocked signals and unblock resume signal 3590 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 3591 sigdelset(&suspend_set, os::Solaris::SIGasync()); 3592 3593 sr_semaphore.signal(); 3594 // wait here until we are resumed 3595 while (1) { 3596 sigsuspend(&suspend_set); 3597 3598 os::SuspendResume::State result = osthread->sr.running(); 3599 if (result == os::SuspendResume::SR_RUNNING) { 3600 sr_semaphore.signal(); 3601 break; 3602 } 3603 } 3604 3605 } else if (state == os::SuspendResume::SR_RUNNING) { 3606 // request was cancelled, continue 3607 } else { 3608 ShouldNotReachHere(); 3609 } 3610 3611 resume_clear_context(osthread); 3612 } else if (current == os::SuspendResume::SR_RUNNING) { 3613 // request was cancelled, continue 3614 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 3615 // ignore 3616 } else { 3617 // ignore 3618 } 3619 3620 errno = old_errno; 3621 } 3622 3623 void os::print_statistics() { 3624 } 3625 3626 bool os::message_box(const char* title, const char* message) { 3627 int i; 3628 fdStream err(defaultStream::error_fd()); 3629 for (i = 0; i < 78; i++) err.print_raw("="); 3630 err.cr(); 3631 err.print_raw_cr(title); 3632 for (i = 0; i < 78; i++) err.print_raw("-"); 3633 err.cr(); 3634 err.print_raw_cr(message); 3635 for (i = 0; i < 78; i++) err.print_raw("="); 3636 err.cr(); 3637 3638 char buf[16]; 3639 // Prevent process from exiting upon "read error" without consuming all CPU 3640 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3641 3642 return buf[0] == 'y' || buf[0] == 'Y'; 3643 } 3644 3645 static int sr_notify(OSThread* osthread) { 3646 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync()); 3647 assert_status(status == 0, status, "thr_kill"); 3648 return status; 3649 } 3650 3651 // "Randomly" selected value for how long we want to spin 3652 // before bailing out on suspending a thread, also how often 3653 // we send a signal to a thread we want to resume 3654 static const int RANDOMLY_LARGE_INTEGER = 1000000; 3655 static const int RANDOMLY_LARGE_INTEGER2 = 100; 3656 3657 static bool do_suspend(OSThread* osthread) { 3658 assert(osthread->sr.is_running(), "thread should be running"); 3659 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 3660 3661 // mark as suspended and send signal 3662 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 3663 // failed to switch, state wasn't running? 3664 ShouldNotReachHere(); 3665 return false; 3666 } 3667 3668 if (sr_notify(osthread) != 0) { 3669 ShouldNotReachHere(); 3670 } 3671 3672 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 3673 while (true) { 3674 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) { 3675 break; 3676 } else { 3677 // timeout 3678 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 3679 if (cancelled == os::SuspendResume::SR_RUNNING) { 3680 return false; 3681 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 3682 // make sure that we consume the signal on the semaphore as well 3683 sr_semaphore.wait(); 3684 break; 3685 } else { 3686 ShouldNotReachHere(); 3687 return false; 3688 } 3689 } 3690 } 3691 3692 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 3693 return true; 3694 } 3695 3696 static void do_resume(OSThread* osthread) { 3697 assert(osthread->sr.is_suspended(), "thread should be suspended"); 3698 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 3699 3700 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 3701 // failed to switch to WAKEUP_REQUEST 3702 ShouldNotReachHere(); 3703 return; 3704 } 3705 3706 while (true) { 3707 if (sr_notify(osthread) == 0) { 3708 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 3709 if (osthread->sr.is_running()) { 3710 return; 3711 } 3712 } 3713 } else { 3714 ShouldNotReachHere(); 3715 } 3716 } 3717 3718 guarantee(osthread->sr.is_running(), "Must be running!"); 3719 } 3720 3721 void os::SuspendedThreadTask::internal_do_task() { 3722 if (do_suspend(_thread->osthread())) { 3723 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3724 do_task(context); 3725 do_resume(_thread->osthread()); 3726 } 3727 } 3728 3729 class PcFetcher : public os::SuspendedThreadTask { 3730 public: 3731 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} 3732 ExtendedPC result(); 3733 protected: 3734 void do_task(const os::SuspendedThreadTaskContext& context); 3735 private: 3736 ExtendedPC _epc; 3737 }; 3738 3739 ExtendedPC PcFetcher::result() { 3740 guarantee(is_done(), "task is not done yet."); 3741 return _epc; 3742 } 3743 3744 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { 3745 Thread* thread = context.thread(); 3746 OSThread* osthread = thread->osthread(); 3747 if (osthread->ucontext() != NULL) { 3748 _epc = os::Solaris::ucontext_get_pc((const ucontext_t *) context.ucontext()); 3749 } else { 3750 // NULL context is unexpected, double-check this is the VMThread 3751 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 3752 } 3753 } 3754 3755 // A lightweight implementation that does not suspend the target thread and 3756 // thus returns only a hint. Used for profiling only! 3757 ExtendedPC os::get_thread_pc(Thread* thread) { 3758 // Make sure that it is called by the watcher and the Threads lock is owned. 3759 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock"); 3760 // For now, is only used to profile the VM Thread 3761 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3762 PcFetcher fetcher(thread); 3763 fetcher.run(); 3764 return fetcher.result(); 3765 } 3766 3767 3768 // This does not do anything on Solaris. This is basically a hook for being 3769 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 3770 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3771 const methodHandle& method, JavaCallArguments* args, 3772 Thread* thread) { 3773 f(value, method, args, thread); 3774 } 3775 3776 // This routine may be used by user applications as a "hook" to catch signals. 3777 // The user-defined signal handler must pass unrecognized signals to this 3778 // routine, and if it returns true (non-zero), then the signal handler must 3779 // return immediately. If the flag "abort_if_unrecognized" is true, then this 3780 // routine will never retun false (zero), but instead will execute a VM panic 3781 // routine kill the process. 3782 // 3783 // If this routine returns false, it is OK to call it again. This allows 3784 // the user-defined signal handler to perform checks either before or after 3785 // the VM performs its own checks. Naturally, the user code would be making 3786 // a serious error if it tried to handle an exception (such as a null check 3787 // or breakpoint) that the VM was generating for its own correct operation. 3788 // 3789 // This routine may recognize any of the following kinds of signals: 3790 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 3791 // os::Solaris::SIGasync 3792 // It should be consulted by handlers for any of those signals. 3793 // 3794 // The caller of this routine must pass in the three arguments supplied 3795 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 3796 // field of the structure passed to sigaction(). This routine assumes that 3797 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3798 // 3799 // Note that the VM will print warnings if it detects conflicting signal 3800 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3801 // 3802 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo, 3803 siginfo_t* siginfo, 3804 void* ucontext, 3805 int abort_if_unrecognized); 3806 3807 3808 void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 3809 int orig_errno = errno; // Preserve errno value over signal handler. 3810 JVM_handle_solaris_signal(sig, info, ucVoid, true); 3811 errno = orig_errno; 3812 } 3813 3814 // This boolean allows users to forward their own non-matching signals 3815 // to JVM_handle_solaris_signal, harmlessly. 3816 bool os::Solaris::signal_handlers_are_installed = false; 3817 3818 // For signal-chaining 3819 bool os::Solaris::libjsig_is_loaded = false; 3820 typedef struct sigaction *(*get_signal_t)(int); 3821 get_signal_t os::Solaris::get_signal_action = NULL; 3822 3823 struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 3824 struct sigaction *actp = NULL; 3825 3826 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) { 3827 // Retrieve the old signal handler from libjsig 3828 actp = (*get_signal_action)(sig); 3829 } 3830 if (actp == NULL) { 3831 // Retrieve the preinstalled signal handler from jvm 3832 actp = get_preinstalled_handler(sig); 3833 } 3834 3835 return actp; 3836 } 3837 3838 static bool call_chained_handler(struct sigaction *actp, int sig, 3839 siginfo_t *siginfo, void *context) { 3840 // Call the old signal handler 3841 if (actp->sa_handler == SIG_DFL) { 3842 // It's more reasonable to let jvm treat it as an unexpected exception 3843 // instead of taking the default action. 3844 return false; 3845 } else if (actp->sa_handler != SIG_IGN) { 3846 if ((actp->sa_flags & SA_NODEFER) == 0) { 3847 // automaticlly block the signal 3848 sigaddset(&(actp->sa_mask), sig); 3849 } 3850 3851 sa_handler_t hand; 3852 sa_sigaction_t sa; 3853 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3854 // retrieve the chained handler 3855 if (siginfo_flag_set) { 3856 sa = actp->sa_sigaction; 3857 } else { 3858 hand = actp->sa_handler; 3859 } 3860 3861 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3862 actp->sa_handler = SIG_DFL; 3863 } 3864 3865 // try to honor the signal mask 3866 sigset_t oset; 3867 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3868 3869 // call into the chained handler 3870 if (siginfo_flag_set) { 3871 (*sa)(sig, siginfo, context); 3872 } else { 3873 (*hand)(sig); 3874 } 3875 3876 // restore the signal mask 3877 pthread_sigmask(SIG_SETMASK, &oset, 0); 3878 } 3879 // Tell jvm's signal handler the signal is taken care of. 3880 return true; 3881 } 3882 3883 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3884 bool chained = false; 3885 // signal-chaining 3886 if (UseSignalChaining) { 3887 struct sigaction *actp = get_chained_signal_action(sig); 3888 if (actp != NULL) { 3889 chained = call_chained_handler(actp, sig, siginfo, context); 3890 } 3891 } 3892 return chained; 3893 } 3894 3895 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 3896 assert((chainedsigactions != (struct sigaction *)NULL) && 3897 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3898 if (preinstalled_sigs[sig] != 0) { 3899 return &chainedsigactions[sig]; 3900 } 3901 return NULL; 3902 } 3903 3904 void os::Solaris::save_preinstalled_handler(int sig, 3905 struct sigaction& oldAct) { 3906 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 3907 assert((chainedsigactions != (struct sigaction *)NULL) && 3908 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3909 chainedsigactions[sig] = oldAct; 3910 preinstalled_sigs[sig] = 1; 3911 } 3912 3913 void os::Solaris::set_signal_handler(int sig, bool set_installed, 3914 bool oktochain) { 3915 // Check for overwrite. 3916 struct sigaction oldAct; 3917 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3918 void* oldhand = 3919 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3920 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3921 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3922 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3923 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 3924 if (AllowUserSignalHandlers || !set_installed) { 3925 // Do not overwrite; user takes responsibility to forward to us. 3926 return; 3927 } else if (UseSignalChaining) { 3928 if (oktochain) { 3929 // save the old handler in jvm 3930 save_preinstalled_handler(sig, oldAct); 3931 } else { 3932 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal."); 3933 } 3934 // libjsig also interposes the sigaction() call below and saves the 3935 // old sigaction on it own. 3936 } else { 3937 fatal("Encountered unexpected pre-existing sigaction handler " 3938 "%#lx for signal %d.", (long)oldhand, sig); 3939 } 3940 } 3941 3942 struct sigaction sigAct; 3943 sigfillset(&(sigAct.sa_mask)); 3944 sigAct.sa_handler = SIG_DFL; 3945 3946 sigAct.sa_sigaction = signalHandler; 3947 // Handle SIGSEGV on alternate signal stack if 3948 // not using stack banging 3949 if (!UseStackBanging && sig == SIGSEGV) { 3950 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 3951 } else { 3952 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 3953 } 3954 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 3955 3956 sigaction(sig, &sigAct, &oldAct); 3957 3958 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3959 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3960 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3961 } 3962 3963 3964 #define DO_SIGNAL_CHECK(sig) \ 3965 do { \ 3966 if (!sigismember(&check_signal_done, sig)) { \ 3967 os::Solaris::check_signal_handler(sig); \ 3968 } \ 3969 } while (0) 3970 3971 // This method is a periodic task to check for misbehaving JNI applications 3972 // under CheckJNI, we can add any periodic checks here 3973 3974 void os::run_periodic_checks() { 3975 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 3976 // thereby preventing a NULL checks. 3977 if (!check_addr0_done) check_addr0_done = check_addr0(tty); 3978 3979 if (check_signals == false) return; 3980 3981 // SEGV and BUS if overridden could potentially prevent 3982 // generation of hs*.log in the event of a crash, debugging 3983 // such a case can be very challenging, so we absolutely 3984 // check for the following for a good measure: 3985 DO_SIGNAL_CHECK(SIGSEGV); 3986 DO_SIGNAL_CHECK(SIGILL); 3987 DO_SIGNAL_CHECK(SIGFPE); 3988 DO_SIGNAL_CHECK(SIGBUS); 3989 DO_SIGNAL_CHECK(SIGPIPE); 3990 DO_SIGNAL_CHECK(SIGXFSZ); 3991 3992 // ReduceSignalUsage allows the user to override these handlers 3993 // see comments at the very top and jvm_solaris.h 3994 if (!ReduceSignalUsage) { 3995 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3996 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3997 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3998 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3999 } 4000 4001 // See comments above for using JVM1/JVM2 4002 DO_SIGNAL_CHECK(os::Solaris::SIGasync()); 4003 4004 } 4005 4006 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 4007 4008 static os_sigaction_t os_sigaction = NULL; 4009 4010 void os::Solaris::check_signal_handler(int sig) { 4011 char buf[O_BUFLEN]; 4012 address jvmHandler = NULL; 4013 4014 struct sigaction act; 4015 if (os_sigaction == NULL) { 4016 // only trust the default sigaction, in case it has been interposed 4017 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 4018 if (os_sigaction == NULL) return; 4019 } 4020 4021 os_sigaction(sig, (struct sigaction*)NULL, &act); 4022 4023 address thisHandler = (act.sa_flags & SA_SIGINFO) 4024 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 4025 : CAST_FROM_FN_PTR(address, act.sa_handler); 4026 4027 4028 switch (sig) { 4029 case SIGSEGV: 4030 case SIGBUS: 4031 case SIGFPE: 4032 case SIGPIPE: 4033 case SIGXFSZ: 4034 case SIGILL: 4035 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4036 break; 4037 4038 case SHUTDOWN1_SIGNAL: 4039 case SHUTDOWN2_SIGNAL: 4040 case SHUTDOWN3_SIGNAL: 4041 case BREAK_SIGNAL: 4042 jvmHandler = (address)user_handler(); 4043 break; 4044 4045 default: 4046 int asynsig = os::Solaris::SIGasync(); 4047 4048 if (sig == asynsig) { 4049 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4050 } else { 4051 return; 4052 } 4053 break; 4054 } 4055 4056 4057 if (thisHandler != jvmHandler) { 4058 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 4059 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 4060 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 4061 // No need to check this sig any longer 4062 sigaddset(&check_signal_done, sig); 4063 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 4064 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 4065 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 4066 exception_name(sig, buf, O_BUFLEN)); 4067 } 4068 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 4069 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 4070 tty->print("expected:"); 4071 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig)); 4072 tty->cr(); 4073 tty->print(" found:"); 4074 os::Posix::print_sa_flags(tty, act.sa_flags); 4075 tty->cr(); 4076 // No need to check this sig any longer 4077 sigaddset(&check_signal_done, sig); 4078 } 4079 4080 // Print all the signal handler state 4081 if (sigismember(&check_signal_done, sig)) { 4082 print_signal_handlers(tty, buf, O_BUFLEN); 4083 } 4084 4085 } 4086 4087 void os::Solaris::install_signal_handlers() { 4088 bool libjsigdone = false; 4089 signal_handlers_are_installed = true; 4090 4091 // signal-chaining 4092 typedef void (*signal_setting_t)(); 4093 signal_setting_t begin_signal_setting = NULL; 4094 signal_setting_t end_signal_setting = NULL; 4095 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4096 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 4097 if (begin_signal_setting != NULL) { 4098 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4099 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 4100 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 4101 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 4102 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t, 4103 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version")); 4104 libjsig_is_loaded = true; 4105 if (os::Solaris::get_libjsig_version != NULL) { 4106 libjsigversion = (*os::Solaris::get_libjsig_version)(); 4107 } 4108 assert(UseSignalChaining, "should enable signal-chaining"); 4109 } 4110 if (libjsig_is_loaded) { 4111 // Tell libjsig jvm is setting signal handlers 4112 (*begin_signal_setting)(); 4113 } 4114 4115 set_signal_handler(SIGSEGV, true, true); 4116 set_signal_handler(SIGPIPE, true, true); 4117 set_signal_handler(SIGXFSZ, true, true); 4118 set_signal_handler(SIGBUS, true, true); 4119 set_signal_handler(SIGILL, true, true); 4120 set_signal_handler(SIGFPE, true, true); 4121 4122 4123 if (os::Solaris::SIGasync() > OLDMAXSIGNUM) { 4124 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so 4125 // can not register overridable signals which might be > 32 4126 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) { 4127 // Tell libjsig jvm has finished setting signal handlers 4128 (*end_signal_setting)(); 4129 libjsigdone = true; 4130 } 4131 } 4132 4133 set_signal_handler(os::Solaris::SIGasync(), true, true); 4134 4135 if (libjsig_is_loaded && !libjsigdone) { 4136 // Tell libjsig jvm finishes setting signal handlers 4137 (*end_signal_setting)(); 4138 } 4139 4140 // We don't activate signal checker if libjsig is in place, we trust ourselves 4141 // and if UserSignalHandler is installed all bets are off. 4142 // Log that signal checking is off only if -verbose:jni is specified. 4143 if (CheckJNICalls) { 4144 if (libjsig_is_loaded) { 4145 if (PrintJNIResolving) { 4146 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 4147 } 4148 check_signals = false; 4149 } 4150 if (AllowUserSignalHandlers) { 4151 if (PrintJNIResolving) { 4152 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4153 } 4154 check_signals = false; 4155 } 4156 } 4157 } 4158 4159 4160 void report_error(const char* file_name, int line_no, const char* title, 4161 const char* format, ...); 4162 4163 // (Static) wrappers for the liblgrp API 4164 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 4165 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 4166 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 4167 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 4168 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 4169 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 4170 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 4171 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 4172 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 4173 4174 static address resolve_symbol_lazy(const char* name) { 4175 address addr = (address) dlsym(RTLD_DEFAULT, name); 4176 if (addr == NULL) { 4177 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 4178 addr = (address) dlsym(RTLD_NEXT, name); 4179 } 4180 return addr; 4181 } 4182 4183 static address resolve_symbol(const char* name) { 4184 address addr = resolve_symbol_lazy(name); 4185 if (addr == NULL) { 4186 fatal(dlerror()); 4187 } 4188 return addr; 4189 } 4190 4191 void os::Solaris::libthread_init() { 4192 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 4193 4194 lwp_priocntl_init(); 4195 4196 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 4197 if (func == NULL) { 4198 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 4199 // Guarantee that this VM is running on an new enough OS (5.6 or 4200 // later) that it will have a new enough libthread.so. 4201 guarantee(func != NULL, "libthread.so is too old."); 4202 } 4203 4204 int size; 4205 void (*handler_info_func)(address *, int *); 4206 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 4207 handler_info_func(&handler_start, &size); 4208 handler_end = handler_start + size; 4209 } 4210 4211 4212 int_fnP_mutex_tP os::Solaris::_mutex_lock; 4213 int_fnP_mutex_tP os::Solaris::_mutex_trylock; 4214 int_fnP_mutex_tP os::Solaris::_mutex_unlock; 4215 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 4216 int_fnP_mutex_tP os::Solaris::_mutex_destroy; 4217 int os::Solaris::_mutex_scope = USYNC_THREAD; 4218 4219 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 4220 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 4221 int_fnP_cond_tP os::Solaris::_cond_signal; 4222 int_fnP_cond_tP os::Solaris::_cond_broadcast; 4223 int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 4224 int_fnP_cond_tP os::Solaris::_cond_destroy; 4225 int os::Solaris::_cond_scope = USYNC_THREAD; 4226 4227 void os::Solaris::synchronization_init() { 4228 if (UseLWPSynchronization) { 4229 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 4230 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 4231 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 4232 os::Solaris::set_mutex_init(lwp_mutex_init); 4233 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 4234 os::Solaris::set_mutex_scope(USYNC_THREAD); 4235 4236 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 4237 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 4238 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 4239 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 4240 os::Solaris::set_cond_init(lwp_cond_init); 4241 os::Solaris::set_cond_destroy(lwp_cond_destroy); 4242 os::Solaris::set_cond_scope(USYNC_THREAD); 4243 } else { 4244 os::Solaris::set_mutex_scope(USYNC_THREAD); 4245 os::Solaris::set_cond_scope(USYNC_THREAD); 4246 4247 if (UsePthreads) { 4248 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 4249 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 4250 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 4251 os::Solaris::set_mutex_init(pthread_mutex_default_init); 4252 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 4253 4254 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 4255 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 4256 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 4257 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 4258 os::Solaris::set_cond_init(pthread_cond_default_init); 4259 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 4260 } else { 4261 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 4262 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 4263 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 4264 os::Solaris::set_mutex_init(::mutex_init); 4265 os::Solaris::set_mutex_destroy(::mutex_destroy); 4266 4267 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 4268 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 4269 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 4270 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 4271 os::Solaris::set_cond_init(::cond_init); 4272 os::Solaris::set_cond_destroy(::cond_destroy); 4273 } 4274 } 4275 } 4276 4277 bool os::Solaris::liblgrp_init() { 4278 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 4279 if (handle != NULL) { 4280 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 4281 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 4282 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 4283 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 4284 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 4285 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 4286 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 4287 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 4288 dlsym(handle, "lgrp_cookie_stale"))); 4289 4290 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 4291 set_lgrp_cookie(c); 4292 return true; 4293 } 4294 return false; 4295 } 4296 4297 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 4298 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 4299 static pset_getloadavg_type pset_getloadavg_ptr = NULL; 4300 4301 void init_pset_getloadavg_ptr(void) { 4302 pset_getloadavg_ptr = 4303 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 4304 if (pset_getloadavg_ptr == NULL) { 4305 log_warning(os)("pset_getloadavg function not found"); 4306 } 4307 } 4308 4309 int os::Solaris::_dev_zero_fd = -1; 4310 4311 // this is called _before_ the global arguments have been parsed 4312 void os::init(void) { 4313 _initial_pid = getpid(); 4314 4315 max_hrtime = first_hrtime = gethrtime(); 4316 4317 init_random(1234567); 4318 4319 page_size = sysconf(_SC_PAGESIZE); 4320 if (page_size == -1) { 4321 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 4322 } 4323 init_page_sizes((size_t) page_size); 4324 4325 Solaris::initialize_system_info(); 4326 4327 int fd = ::open("/dev/zero", O_RDWR); 4328 if (fd < 0) { 4329 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno)); 4330 } else { 4331 Solaris::set_dev_zero_fd(fd); 4332 4333 // Close on exec, child won't inherit. 4334 fcntl(fd, F_SETFD, FD_CLOEXEC); 4335 } 4336 4337 clock_tics_per_sec = CLK_TCK; 4338 4339 // check if dladdr1() exists; dladdr1 can provide more information than 4340 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 4341 // and is available on linker patches for 5.7 and 5.8. 4342 // libdl.so must have been loaded, this call is just an entry lookup 4343 void * hdl = dlopen("libdl.so", RTLD_NOW); 4344 if (hdl) { 4345 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 4346 } 4347 4348 // (Solaris only) this switches to calls that actually do locking. 4349 ThreadCritical::initialize(); 4350 4351 main_thread = thr_self(); 4352 4353 // Constant minimum stack size allowed. It must be at least 4354 // the minimum of what the OS supports (thr_min_stack()), and 4355 // enough to allow the thread to get to user bytecode execution. 4356 Posix::_compiler_thread_min_stack_allowed = MAX2(thr_min_stack(), 4357 Posix::_compiler_thread_min_stack_allowed); 4358 Posix::_java_thread_min_stack_allowed = MAX2(thr_min_stack(), 4359 Posix::_java_thread_min_stack_allowed); 4360 Posix::_vm_internal_thread_min_stack_allowed = MAX2(thr_min_stack(), 4361 Posix::_vm_internal_thread_min_stack_allowed); 4362 4363 // dynamic lookup of functions that may not be available in our lowest 4364 // supported Solaris release 4365 void * handle = dlopen("libc.so.1", RTLD_LAZY); 4366 if (handle != NULL) { 4367 Solaris::_pthread_setname_np = // from 11.3 4368 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np"); 4369 } 4370 } 4371 4372 // To install functions for atexit system call 4373 extern "C" { 4374 static void perfMemory_exit_helper() { 4375 perfMemory_exit(); 4376 } 4377 } 4378 4379 // this is called _after_ the global arguments have been parsed 4380 jint os::init_2(void) { 4381 // try to enable extended file IO ASAP, see 6431278 4382 os::Solaris::try_enable_extended_io(); 4383 4384 // Allocate a single page and mark it as readable for safepoint polling. Also 4385 // use this first mmap call to check support for MAP_ALIGN. 4386 address polling_page = (address)Solaris::mmap_chunk((char*)page_size, 4387 page_size, 4388 MAP_PRIVATE | MAP_ALIGN, 4389 PROT_READ); 4390 if (polling_page == NULL) { 4391 has_map_align = false; 4392 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, 4393 PROT_READ); 4394 } 4395 4396 os::set_polling_page(polling_page); 4397 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page)); 4398 4399 if (!UseMembar) { 4400 address mem_serialize_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE); 4401 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 4402 os::set_memory_serialize_page(mem_serialize_page); 4403 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page)); 4404 } 4405 4406 // Check and sets minimum stack sizes against command line options 4407 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 4408 return JNI_ERR; 4409 } 4410 4411 Solaris::libthread_init(); 4412 4413 if (UseNUMA) { 4414 if (!Solaris::liblgrp_init()) { 4415 UseNUMA = false; 4416 } else { 4417 size_t lgrp_limit = os::numa_get_groups_num(); 4418 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); 4419 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 4420 FREE_C_HEAP_ARRAY(int, lgrp_ids); 4421 if (lgrp_num < 2) { 4422 // There's only one locality group, disable NUMA. 4423 UseNUMA = false; 4424 } 4425 } 4426 if (!UseNUMA && ForceNUMA) { 4427 UseNUMA = true; 4428 } 4429 } 4430 4431 Solaris::signal_sets_init(); 4432 Solaris::init_signal_mem(); 4433 Solaris::install_signal_handlers(); 4434 4435 if (libjsigversion < JSIG_VERSION_1_4_1) { 4436 Maxlibjsigsigs = OLDMAXSIGNUM; 4437 } 4438 4439 // initialize synchronization primitives to use either thread or 4440 // lwp synchronization (controlled by UseLWPSynchronization) 4441 Solaris::synchronization_init(); 4442 4443 if (MaxFDLimit) { 4444 // set the number of file descriptors to max. print out error 4445 // if getrlimit/setrlimit fails but continue regardless. 4446 struct rlimit nbr_files; 4447 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 4448 if (status != 0) { 4449 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 4450 } else { 4451 nbr_files.rlim_cur = nbr_files.rlim_max; 4452 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 4453 if (status != 0) { 4454 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 4455 } 4456 } 4457 } 4458 4459 // Calculate theoretical max. size of Threads to guard gainst 4460 // artifical out-of-memory situations, where all available address- 4461 // space has been reserved by thread stacks. Default stack size is 1Mb. 4462 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 4463 JavaThread::stack_size_at_create() : (1*K*K); 4464 assert(pre_thread_stack_size != 0, "Must have a stack"); 4465 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 4466 // we should start doing Virtual Memory banging. Currently when the threads will 4467 // have used all but 200Mb of space. 4468 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 4469 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 4470 4471 // at-exit methods are called in the reverse order of their registration. 4472 // In Solaris 7 and earlier, atexit functions are called on return from 4473 // main or as a result of a call to exit(3C). There can be only 32 of 4474 // these functions registered and atexit() does not set errno. In Solaris 4475 // 8 and later, there is no limit to the number of functions registered 4476 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 4477 // functions are called upon dlclose(3DL) in addition to return from main 4478 // and exit(3C). 4479 4480 if (PerfAllowAtExitRegistration) { 4481 // only register atexit functions if PerfAllowAtExitRegistration is set. 4482 // atexit functions can be delayed until process exit time, which 4483 // can be problematic for embedded VM situations. Embedded VMs should 4484 // call DestroyJavaVM() to assure that VM resources are released. 4485 4486 // note: perfMemory_exit_helper atexit function may be removed in 4487 // the future if the appropriate cleanup code can be added to the 4488 // VM_Exit VMOperation's doit method. 4489 if (atexit(perfMemory_exit_helper) != 0) { 4490 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 4491 } 4492 } 4493 4494 // Init pset_loadavg function pointer 4495 init_pset_getloadavg_ptr(); 4496 4497 return JNI_OK; 4498 } 4499 4500 // Mark the polling page as unreadable 4501 void os::make_polling_page_unreadable(void) { 4502 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) { 4503 fatal("Could not disable polling page"); 4504 } 4505 } 4506 4507 // Mark the polling page as readable 4508 void os::make_polling_page_readable(void) { 4509 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) { 4510 fatal("Could not enable polling page"); 4511 } 4512 } 4513 4514 // Is a (classpath) directory empty? 4515 bool os::dir_is_empty(const char* path) { 4516 DIR *dir = NULL; 4517 struct dirent *ptr; 4518 4519 dir = opendir(path); 4520 if (dir == NULL) return true; 4521 4522 // Scan the directory 4523 bool result = true; 4524 char buf[sizeof(struct dirent) + MAX_PATH]; 4525 struct dirent *dbuf = (struct dirent *) buf; 4526 while (result && (ptr = readdir(dir, dbuf)) != NULL) { 4527 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 4528 result = false; 4529 } 4530 } 4531 closedir(dir); 4532 return result; 4533 } 4534 4535 // This code originates from JDK's sysOpen and open64_w 4536 // from src/solaris/hpi/src/system_md.c 4537 4538 int os::open(const char *path, int oflag, int mode) { 4539 if (strlen(path) > MAX_PATH - 1) { 4540 errno = ENAMETOOLONG; 4541 return -1; 4542 } 4543 int fd; 4544 4545 fd = ::open64(path, oflag, mode); 4546 if (fd == -1) return -1; 4547 4548 // If the open succeeded, the file might still be a directory 4549 { 4550 struct stat64 buf64; 4551 int ret = ::fstat64(fd, &buf64); 4552 int st_mode = buf64.st_mode; 4553 4554 if (ret != -1) { 4555 if ((st_mode & S_IFMT) == S_IFDIR) { 4556 errno = EISDIR; 4557 ::close(fd); 4558 return -1; 4559 } 4560 } else { 4561 ::close(fd); 4562 return -1; 4563 } 4564 } 4565 4566 // 32-bit Solaris systems suffer from: 4567 // 4568 // - an historical default soft limit of 256 per-process file 4569 // descriptors that is too low for many Java programs. 4570 // 4571 // - a design flaw where file descriptors created using stdio 4572 // fopen must be less than 256, _even_ when the first limit above 4573 // has been raised. This can cause calls to fopen (but not calls to 4574 // open, for example) to fail mysteriously, perhaps in 3rd party 4575 // native code (although the JDK itself uses fopen). One can hardly 4576 // criticize them for using this most standard of all functions. 4577 // 4578 // We attempt to make everything work anyways by: 4579 // 4580 // - raising the soft limit on per-process file descriptors beyond 4581 // 256 4582 // 4583 // - As of Solaris 10u4, we can request that Solaris raise the 256 4584 // stdio fopen limit by calling function enable_extended_FILE_stdio. 4585 // This is done in init_2 and recorded in enabled_extended_FILE_stdio 4586 // 4587 // - If we are stuck on an old (pre 10u4) Solaris system, we can 4588 // workaround the bug by remapping non-stdio file descriptors below 4589 // 256 to ones beyond 256, which is done below. 4590 // 4591 // See: 4592 // 1085341: 32-bit stdio routines should support file descriptors >255 4593 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files 4594 // 6431278: Netbeans crash on 32 bit Solaris: need to call 4595 // enable_extended_FILE_stdio() in VM initialisation 4596 // Giri Mandalika's blog 4597 // http://technopark02.blogspot.com/2005_05_01_archive.html 4598 // 4599 #ifndef _LP64 4600 if ((!enabled_extended_FILE_stdio) && fd < 256) { 4601 int newfd = ::fcntl(fd, F_DUPFD, 256); 4602 if (newfd != -1) { 4603 ::close(fd); 4604 fd = newfd; 4605 } 4606 } 4607 #endif // 32-bit Solaris 4608 4609 // All file descriptors that are opened in the JVM and not 4610 // specifically destined for a subprocess should have the 4611 // close-on-exec flag set. If we don't set it, then careless 3rd 4612 // party native code might fork and exec without closing all 4613 // appropriate file descriptors (e.g. as we do in closeDescriptors in 4614 // UNIXProcess.c), and this in turn might: 4615 // 4616 // - cause end-of-file to fail to be detected on some file 4617 // descriptors, resulting in mysterious hangs, or 4618 // 4619 // - might cause an fopen in the subprocess to fail on a system 4620 // suffering from bug 1085341. 4621 // 4622 // (Yes, the default setting of the close-on-exec flag is a Unix 4623 // design flaw) 4624 // 4625 // See: 4626 // 1085341: 32-bit stdio routines should support file descriptors >255 4627 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 4628 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 4629 // 4630 #ifdef FD_CLOEXEC 4631 { 4632 int flags = ::fcntl(fd, F_GETFD); 4633 if (flags != -1) { 4634 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 4635 } 4636 } 4637 #endif 4638 4639 return fd; 4640 } 4641 4642 // create binary file, rewriting existing file if required 4643 int os::create_binary_file(const char* path, bool rewrite_existing) { 4644 int oflags = O_WRONLY | O_CREAT; 4645 if (!rewrite_existing) { 4646 oflags |= O_EXCL; 4647 } 4648 return ::open64(path, oflags, S_IREAD | S_IWRITE); 4649 } 4650 4651 // return current position of file pointer 4652 jlong os::current_file_offset(int fd) { 4653 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 4654 } 4655 4656 // move file pointer to the specified offset 4657 jlong os::seek_to_file_offset(int fd, jlong offset) { 4658 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 4659 } 4660 4661 jlong os::lseek(int fd, jlong offset, int whence) { 4662 return (jlong) ::lseek64(fd, offset, whence); 4663 } 4664 4665 char * os::native_path(char *path) { 4666 return path; 4667 } 4668 4669 int os::ftruncate(int fd, jlong length) { 4670 return ::ftruncate64(fd, length); 4671 } 4672 4673 int os::fsync(int fd) { 4674 RESTARTABLE_RETURN_INT(::fsync(fd)); 4675 } 4676 4677 int os::available(int fd, jlong *bytes) { 4678 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 4679 "Assumed _thread_in_native"); 4680 jlong cur, end; 4681 int mode; 4682 struct stat64 buf64; 4683 4684 if (::fstat64(fd, &buf64) >= 0) { 4685 mode = buf64.st_mode; 4686 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 4687 int n,ioctl_return; 4688 4689 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return); 4690 if (ioctl_return>= 0) { 4691 *bytes = n; 4692 return 1; 4693 } 4694 } 4695 } 4696 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 4697 return 0; 4698 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 4699 return 0; 4700 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 4701 return 0; 4702 } 4703 *bytes = end - cur; 4704 return 1; 4705 } 4706 4707 // Map a block of memory. 4708 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4709 char *addr, size_t bytes, bool read_only, 4710 bool allow_exec) { 4711 int prot; 4712 int flags; 4713 4714 if (read_only) { 4715 prot = PROT_READ; 4716 flags = MAP_SHARED; 4717 } else { 4718 prot = PROT_READ | PROT_WRITE; 4719 flags = MAP_PRIVATE; 4720 } 4721 4722 if (allow_exec) { 4723 prot |= PROT_EXEC; 4724 } 4725 4726 if (addr != NULL) { 4727 flags |= MAP_FIXED; 4728 } 4729 4730 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 4731 fd, file_offset); 4732 if (mapped_address == MAP_FAILED) { 4733 return NULL; 4734 } 4735 return mapped_address; 4736 } 4737 4738 4739 // Remap a block of memory. 4740 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4741 char *addr, size_t bytes, bool read_only, 4742 bool allow_exec) { 4743 // same as map_memory() on this OS 4744 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4745 allow_exec); 4746 } 4747 4748 4749 // Unmap a block of memory. 4750 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4751 return munmap(addr, bytes) == 0; 4752 } 4753 4754 void os::pause() { 4755 char filename[MAX_PATH]; 4756 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4757 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4758 } else { 4759 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4760 } 4761 4762 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4763 if (fd != -1) { 4764 struct stat buf; 4765 ::close(fd); 4766 while (::stat(filename, &buf) == 0) { 4767 (void)::poll(NULL, 0, 100); 4768 } 4769 } else { 4770 jio_fprintf(stderr, 4771 "Could not open pause file '%s', continuing immediately.\n", filename); 4772 } 4773 } 4774 4775 #ifndef PRODUCT 4776 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4777 // Turn this on if you need to trace synch operations. 4778 // Set RECORD_SYNCH_LIMIT to a large-enough value, 4779 // and call record_synch_enable and record_synch_disable 4780 // around the computation of interest. 4781 4782 void record_synch(char* name, bool returning); // defined below 4783 4784 class RecordSynch { 4785 char* _name; 4786 public: 4787 RecordSynch(char* name) :_name(name) { record_synch(_name, false); } 4788 ~RecordSynch() { record_synch(_name, true); } 4789 }; 4790 4791 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 4792 extern "C" ret name params { \ 4793 typedef ret name##_t params; \ 4794 static name##_t* implem = NULL; \ 4795 static int callcount = 0; \ 4796 if (implem == NULL) { \ 4797 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 4798 if (implem == NULL) fatal(dlerror()); \ 4799 } \ 4800 ++callcount; \ 4801 RecordSynch _rs(#name); \ 4802 inner; \ 4803 return implem args; \ 4804 } 4805 // in dbx, examine callcounts this way: 4806 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 4807 4808 #define CHECK_POINTER_OK(p) \ 4809 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) 4810 #define CHECK_MU \ 4811 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 4812 #define CHECK_CV \ 4813 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 4814 #define CHECK_P(p) \ 4815 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 4816 4817 #define CHECK_MUTEX(mutex_op) \ 4818 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 4819 4820 CHECK_MUTEX( mutex_lock) 4821 CHECK_MUTEX( _mutex_lock) 4822 CHECK_MUTEX( mutex_unlock) 4823 CHECK_MUTEX(_mutex_unlock) 4824 CHECK_MUTEX( mutex_trylock) 4825 CHECK_MUTEX(_mutex_trylock) 4826 4827 #define CHECK_COND(cond_op) \ 4828 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV); 4829 4830 CHECK_COND( cond_wait); 4831 CHECK_COND(_cond_wait); 4832 CHECK_COND(_cond_wait_cancel); 4833 4834 #define CHECK_COND2(cond_op) \ 4835 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV); 4836 4837 CHECK_COND2( cond_timedwait); 4838 CHECK_COND2(_cond_timedwait); 4839 CHECK_COND2(_cond_timedwait_cancel); 4840 4841 // do the _lwp_* versions too 4842 #define mutex_t lwp_mutex_t 4843 #define cond_t lwp_cond_t 4844 CHECK_MUTEX( _lwp_mutex_lock) 4845 CHECK_MUTEX( _lwp_mutex_unlock) 4846 CHECK_MUTEX( _lwp_mutex_trylock) 4847 CHECK_MUTEX( __lwp_mutex_lock) 4848 CHECK_MUTEX( __lwp_mutex_unlock) 4849 CHECK_MUTEX( __lwp_mutex_trylock) 4850 CHECK_MUTEX(___lwp_mutex_lock) 4851 CHECK_MUTEX(___lwp_mutex_unlock) 4852 4853 CHECK_COND( _lwp_cond_wait); 4854 CHECK_COND( __lwp_cond_wait); 4855 CHECK_COND(___lwp_cond_wait); 4856 4857 CHECK_COND2( _lwp_cond_timedwait); 4858 CHECK_COND2( __lwp_cond_timedwait); 4859 #undef mutex_t 4860 #undef cond_t 4861 4862 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4863 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4864 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 4865 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 4866 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4867 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4868 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4869 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4870 4871 4872 // recording machinery: 4873 4874 enum { RECORD_SYNCH_LIMIT = 200 }; 4875 char* record_synch_name[RECORD_SYNCH_LIMIT]; 4876 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 4877 bool record_synch_returning[RECORD_SYNCH_LIMIT]; 4878 thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 4879 int record_synch_count = 0; 4880 bool record_synch_enabled = false; 4881 4882 // in dbx, examine recorded data this way: 4883 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 4884 4885 void record_synch(char* name, bool returning) { 4886 if (record_synch_enabled) { 4887 if (record_synch_count < RECORD_SYNCH_LIMIT) { 4888 record_synch_name[record_synch_count] = name; 4889 record_synch_returning[record_synch_count] = returning; 4890 record_synch_thread[record_synch_count] = thr_self(); 4891 record_synch_arg0ptr[record_synch_count] = &name; 4892 record_synch_count++; 4893 } 4894 // put more checking code here: 4895 // ... 4896 } 4897 } 4898 4899 void record_synch_enable() { 4900 // start collecting trace data, if not already doing so 4901 if (!record_synch_enabled) record_synch_count = 0; 4902 record_synch_enabled = true; 4903 } 4904 4905 void record_synch_disable() { 4906 // stop collecting trace data 4907 record_synch_enabled = false; 4908 } 4909 4910 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4911 #endif // PRODUCT 4912 4913 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4914 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 4915 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4916 4917 4918 // JVMTI & JVM monitoring and management support 4919 // The thread_cpu_time() and current_thread_cpu_time() are only 4920 // supported if is_thread_cpu_time_supported() returns true. 4921 // They are not supported on Solaris T1. 4922 4923 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4924 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4925 // of a thread. 4926 // 4927 // current_thread_cpu_time() and thread_cpu_time(Thread *) 4928 // returns the fast estimate available on the platform. 4929 4930 // hrtime_t gethrvtime() return value includes 4931 // user time but does not include system time 4932 jlong os::current_thread_cpu_time() { 4933 return (jlong) gethrvtime(); 4934 } 4935 4936 jlong os::thread_cpu_time(Thread *thread) { 4937 // return user level CPU time only to be consistent with 4938 // what current_thread_cpu_time returns. 4939 // thread_cpu_time_info() must be changed if this changes 4940 return os::thread_cpu_time(thread, false /* user time only */); 4941 } 4942 4943 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4944 if (user_sys_cpu_time) { 4945 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4946 } else { 4947 return os::current_thread_cpu_time(); 4948 } 4949 } 4950 4951 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 4952 char proc_name[64]; 4953 int count; 4954 prusage_t prusage; 4955 jlong lwp_time; 4956 int fd; 4957 4958 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 4959 getpid(), 4960 thread->osthread()->lwp_id()); 4961 fd = ::open(proc_name, O_RDONLY); 4962 if (fd == -1) return -1; 4963 4964 do { 4965 count = ::pread(fd, 4966 (void *)&prusage.pr_utime, 4967 thr_time_size, 4968 thr_time_off); 4969 } while (count < 0 && errno == EINTR); 4970 ::close(fd); 4971 if (count < 0) return -1; 4972 4973 if (user_sys_cpu_time) { 4974 // user + system CPU time 4975 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 4976 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 4977 (jlong)prusage.pr_stime.tv_nsec + 4978 (jlong)prusage.pr_utime.tv_nsec; 4979 } else { 4980 // user level CPU time only 4981 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 4982 (jlong)prusage.pr_utime.tv_nsec; 4983 } 4984 4985 return (lwp_time); 4986 } 4987 4988 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4989 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4990 info_ptr->may_skip_backward = false; // elapsed time not wall time 4991 info_ptr->may_skip_forward = false; // elapsed time not wall time 4992 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4993 } 4994 4995 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4996 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4997 info_ptr->may_skip_backward = false; // elapsed time not wall time 4998 info_ptr->may_skip_forward = false; // elapsed time not wall time 4999 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5000 } 5001 5002 bool os::is_thread_cpu_time_supported() { 5003 return true; 5004 } 5005 5006 // System loadavg support. Returns -1 if load average cannot be obtained. 5007 // Return the load average for our processor set if the primitive exists 5008 // (Solaris 9 and later). Otherwise just return system wide loadavg. 5009 int os::loadavg(double loadavg[], int nelem) { 5010 if (pset_getloadavg_ptr != NULL) { 5011 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 5012 } else { 5013 return ::getloadavg(loadavg, nelem); 5014 } 5015 } 5016 5017 //--------------------------------------------------------------------------------- 5018 5019 bool os::find(address addr, outputStream* st) { 5020 Dl_info dlinfo; 5021 memset(&dlinfo, 0, sizeof(dlinfo)); 5022 if (dladdr(addr, &dlinfo) != 0) { 5023 st->print(PTR_FORMAT ": ", addr); 5024 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 5025 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 5026 } else if (dlinfo.dli_fbase != NULL) { 5027 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 5028 } else { 5029 st->print("<absolute address>"); 5030 } 5031 if (dlinfo.dli_fname != NULL) { 5032 st->print(" in %s", dlinfo.dli_fname); 5033 } 5034 if (dlinfo.dli_fbase != NULL) { 5035 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 5036 } 5037 st->cr(); 5038 5039 if (Verbose) { 5040 // decode some bytes around the PC 5041 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 5042 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 5043 address lowest = (address) dlinfo.dli_sname; 5044 if (!lowest) lowest = (address) dlinfo.dli_fbase; 5045 if (begin < lowest) begin = lowest; 5046 Dl_info dlinfo2; 5047 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 5048 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 5049 end = (address) dlinfo2.dli_saddr; 5050 } 5051 Disassembler::decode(begin, end, st); 5052 } 5053 return true; 5054 } 5055 return false; 5056 } 5057 5058 // Following function has been added to support HotSparc's libjvm.so running 5059 // under Solaris production JDK 1.2.2 / 1.3.0. These came from 5060 // src/solaris/hpi/native_threads in the EVM codebase. 5061 // 5062 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 5063 // libraries and should thus be removed. We will leave it behind for a while 5064 // until we no longer want to able to run on top of 1.3.0 Solaris production 5065 // JDK. See 4341971. 5066 5067 #define STACK_SLACK 0x800 5068 5069 extern "C" { 5070 intptr_t sysThreadAvailableStackWithSlack() { 5071 stack_t st; 5072 intptr_t retval, stack_top; 5073 retval = thr_stksegment(&st); 5074 assert(retval == 0, "incorrect return value from thr_stksegment"); 5075 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 5076 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 5077 stack_top=(intptr_t)st.ss_sp-st.ss_size; 5078 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 5079 } 5080 } 5081 5082 // ObjectMonitor park-unpark infrastructure ... 5083 // 5084 // We implement Solaris and Linux PlatformEvents with the 5085 // obvious condvar-mutex-flag triple. 5086 // Another alternative that works quite well is pipes: 5087 // Each PlatformEvent consists of a pipe-pair. 5088 // The thread associated with the PlatformEvent 5089 // calls park(), which reads from the input end of the pipe. 5090 // Unpark() writes into the other end of the pipe. 5091 // The write-side of the pipe must be set NDELAY. 5092 // Unfortunately pipes consume a large # of handles. 5093 // Native solaris lwp_park() and lwp_unpark() work nicely, too. 5094 // Using pipes for the 1st few threads might be workable, however. 5095 // 5096 // park() is permitted to return spuriously. 5097 // Callers of park() should wrap the call to park() in 5098 // an appropriate loop. A litmus test for the correct 5099 // usage of park is the following: if park() were modified 5100 // to immediately return 0 your code should still work, 5101 // albeit degenerating to a spin loop. 5102 // 5103 // In a sense, park()-unpark() just provides more polite spinning 5104 // and polling with the key difference over naive spinning being 5105 // that a parked thread needs to be explicitly unparked() in order 5106 // to wake up and to poll the underlying condition. 5107 // 5108 // Assumption: 5109 // Only one parker can exist on an event, which is why we allocate 5110 // them per-thread. Multiple unparkers can coexist. 5111 // 5112 // _Event transitions in park() 5113 // -1 => -1 : illegal 5114 // 1 => 0 : pass - return immediately 5115 // 0 => -1 : block; then set _Event to 0 before returning 5116 // 5117 // _Event transitions in unpark() 5118 // 0 => 1 : just return 5119 // 1 => 1 : just return 5120 // -1 => either 0 or 1; must signal target thread 5121 // That is, we can safely transition _Event from -1 to either 5122 // 0 or 1. 5123 // 5124 // _Event serves as a restricted-range semaphore. 5125 // -1 : thread is blocked, i.e. there is a waiter 5126 // 0 : neutral: thread is running or ready, 5127 // could have been signaled after a wait started 5128 // 1 : signaled - thread is running or ready 5129 // 5130 // Another possible encoding of _Event would be with 5131 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5132 // 5133 // TODO-FIXME: add DTRACE probes for: 5134 // 1. Tx parks 5135 // 2. Ty unparks Tx 5136 // 3. Tx resumes from park 5137 5138 5139 // value determined through experimentation 5140 #define ROUNDINGFIX 11 5141 5142 // utility to compute the abstime argument to timedwait. 5143 // TODO-FIXME: switch from compute_abstime() to unpackTime(). 5144 5145 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 5146 // millis is the relative timeout time 5147 // abstime will be the absolute timeout time 5148 if (millis < 0) millis = 0; 5149 struct timeval now; 5150 int status = gettimeofday(&now, NULL); 5151 assert(status == 0, "gettimeofday"); 5152 jlong seconds = millis / 1000; 5153 jlong max_wait_period; 5154 5155 if (UseLWPSynchronization) { 5156 // forward port of fix for 4275818 (not sleeping long enough) 5157 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 5158 // _lwp_cond_timedwait() used a round_down algorithm rather 5159 // than a round_up. For millis less than our roundfactor 5160 // it rounded down to 0 which doesn't meet the spec. 5161 // For millis > roundfactor we may return a bit sooner, but 5162 // since we can not accurately identify the patch level and 5163 // this has already been fixed in Solaris 9 and 8 we will 5164 // leave it alone rather than always rounding down. 5165 5166 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 5167 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 5168 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 5169 max_wait_period = 21000000; 5170 } else { 5171 max_wait_period = 50000000; 5172 } 5173 millis %= 1000; 5174 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 5175 seconds = max_wait_period; 5176 } 5177 abstime->tv_sec = now.tv_sec + seconds; 5178 long usec = now.tv_usec + millis * 1000; 5179 if (usec >= 1000000) { 5180 abstime->tv_sec += 1; 5181 usec -= 1000000; 5182 } 5183 abstime->tv_nsec = usec * 1000; 5184 return abstime; 5185 } 5186 5187 void os::PlatformEvent::park() { // AKA: down() 5188 // Transitions for _Event: 5189 // -1 => -1 : illegal 5190 // 1 => 0 : pass - return immediately 5191 // 0 => -1 : block; then set _Event to 0 before returning 5192 5193 // Invariant: Only the thread associated with the Event/PlatformEvent 5194 // may call park(). 5195 assert(_nParked == 0, "invariant"); 5196 5197 int v; 5198 for (;;) { 5199 v = _Event; 5200 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5201 } 5202 guarantee(v >= 0, "invariant"); 5203 if (v == 0) { 5204 // Do this the hard way by blocking ... 5205 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5206 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5207 // Only for SPARC >= V8PlusA 5208 #if defined(__sparc) && defined(COMPILER2) 5209 if (ClearFPUAtPark) { _mark_fpu_nosave(); } 5210 #endif 5211 int status = os::Solaris::mutex_lock(_mutex); 5212 assert_status(status == 0, status, "mutex_lock"); 5213 guarantee(_nParked == 0, "invariant"); 5214 ++_nParked; 5215 while (_Event < 0) { 5216 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 5217 // Treat this the same as if the wait was interrupted 5218 // With usr/lib/lwp going to kernel, always handle ETIME 5219 status = os::Solaris::cond_wait(_cond, _mutex); 5220 if (status == ETIME) status = EINTR; 5221 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 5222 } 5223 --_nParked; 5224 _Event = 0; 5225 status = os::Solaris::mutex_unlock(_mutex); 5226 assert_status(status == 0, status, "mutex_unlock"); 5227 // Paranoia to ensure our locked and lock-free paths interact 5228 // correctly with each other. 5229 OrderAccess::fence(); 5230 } 5231 } 5232 5233 int os::PlatformEvent::park(jlong millis) { 5234 // Transitions for _Event: 5235 // -1 => -1 : illegal 5236 // 1 => 0 : pass - return immediately 5237 // 0 => -1 : block; then set _Event to 0 before returning 5238 5239 guarantee(_nParked == 0, "invariant"); 5240 int v; 5241 for (;;) { 5242 v = _Event; 5243 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5244 } 5245 guarantee(v >= 0, "invariant"); 5246 if (v != 0) return OS_OK; 5247 5248 int ret = OS_TIMEOUT; 5249 timestruc_t abst; 5250 compute_abstime(&abst, millis); 5251 5252 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5253 // For Solaris SPARC set fprs.FEF=0 prior to parking. 5254 // Only for SPARC >= V8PlusA 5255 #if defined(__sparc) && defined(COMPILER2) 5256 if (ClearFPUAtPark) { _mark_fpu_nosave(); } 5257 #endif 5258 int status = os::Solaris::mutex_lock(_mutex); 5259 assert_status(status == 0, status, "mutex_lock"); 5260 guarantee(_nParked == 0, "invariant"); 5261 ++_nParked; 5262 while (_Event < 0) { 5263 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 5264 assert_status(status == 0 || status == EINTR || 5265 status == ETIME || status == ETIMEDOUT, 5266 status, "cond_timedwait"); 5267 if (!FilterSpuriousWakeups) break; // previous semantics 5268 if (status == ETIME || status == ETIMEDOUT) break; 5269 // We consume and ignore EINTR and spurious wakeups. 5270 } 5271 --_nParked; 5272 if (_Event >= 0) ret = OS_OK; 5273 _Event = 0; 5274 status = os::Solaris::mutex_unlock(_mutex); 5275 assert_status(status == 0, status, "mutex_unlock"); 5276 // Paranoia to ensure our locked and lock-free paths interact 5277 // correctly with each other. 5278 OrderAccess::fence(); 5279 return ret; 5280 } 5281 5282 void os::PlatformEvent::unpark() { 5283 // Transitions for _Event: 5284 // 0 => 1 : just return 5285 // 1 => 1 : just return 5286 // -1 => either 0 or 1; must signal target thread 5287 // That is, we can safely transition _Event from -1 to either 5288 // 0 or 1. 5289 // See also: "Semaphores in Plan 9" by Mullender & Cox 5290 // 5291 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5292 // that it will take two back-to-back park() calls for the owning 5293 // thread to block. This has the benefit of forcing a spurious return 5294 // from the first park() call after an unpark() call which will help 5295 // shake out uses of park() and unpark() without condition variables. 5296 5297 if (Atomic::xchg(1, &_Event) >= 0) return; 5298 5299 // If the thread associated with the event was parked, wake it. 5300 // Wait for the thread assoc with the PlatformEvent to vacate. 5301 int status = os::Solaris::mutex_lock(_mutex); 5302 assert_status(status == 0, status, "mutex_lock"); 5303 int AnyWaiters = _nParked; 5304 status = os::Solaris::mutex_unlock(_mutex); 5305 assert_status(status == 0, status, "mutex_unlock"); 5306 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 5307 if (AnyWaiters != 0) { 5308 // Note that we signal() *after* dropping the lock for "immortal" Events. 5309 // This is safe and avoids a common class of futile wakeups. In rare 5310 // circumstances this can cause a thread to return prematurely from 5311 // cond_{timed}wait() but the spurious wakeup is benign and the victim 5312 // will simply re-test the condition and re-park itself. 5313 // This provides particular benefit if the underlying platform does not 5314 // provide wait morphing. 5315 status = os::Solaris::cond_signal(_cond); 5316 assert_status(status == 0, status, "cond_signal"); 5317 } 5318 } 5319 5320 // JSR166 5321 // ------------------------------------------------------- 5322 5323 // The solaris and linux implementations of park/unpark are fairly 5324 // conservative for now, but can be improved. They currently use a 5325 // mutex/condvar pair, plus _counter. 5326 // Park decrements _counter if > 0, else does a condvar wait. Unpark 5327 // sets count to 1 and signals condvar. Only one thread ever waits 5328 // on the condvar. Contention seen when trying to park implies that someone 5329 // is unparking you, so don't wait. And spurious returns are fine, so there 5330 // is no need to track notifications. 5331 5332 #define MAX_SECS 100000000 5333 5334 // This code is common to linux and solaris and will be moved to a 5335 // common place in dolphin. 5336 // 5337 // The passed in time value is either a relative time in nanoseconds 5338 // or an absolute time in milliseconds. Either way it has to be unpacked 5339 // into suitable seconds and nanoseconds components and stored in the 5340 // given timespec structure. 5341 // Given time is a 64-bit value and the time_t used in the timespec is only 5342 // a signed-32-bit value (except on 64-bit Linux) we have to watch for 5343 // overflow if times way in the future are given. Further on Solaris versions 5344 // prior to 10 there is a restriction (see cond_timedwait) that the specified 5345 // number of seconds, in abstime, is less than current_time + 100,000,000. 5346 // As it will be 28 years before "now + 100000000" will overflow we can 5347 // ignore overflow and just impose a hard-limit on seconds using the value 5348 // of "now + 100,000,000". This places a limit on the timeout of about 3.17 5349 // years from "now". 5350 // 5351 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 5352 assert(time > 0, "convertTime"); 5353 5354 struct timeval now; 5355 int status = gettimeofday(&now, NULL); 5356 assert(status == 0, "gettimeofday"); 5357 5358 time_t max_secs = now.tv_sec + MAX_SECS; 5359 5360 if (isAbsolute) { 5361 jlong secs = time / 1000; 5362 if (secs > max_secs) { 5363 absTime->tv_sec = max_secs; 5364 } else { 5365 absTime->tv_sec = secs; 5366 } 5367 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 5368 } else { 5369 jlong secs = time / NANOSECS_PER_SEC; 5370 if (secs >= MAX_SECS) { 5371 absTime->tv_sec = max_secs; 5372 absTime->tv_nsec = 0; 5373 } else { 5374 absTime->tv_sec = now.tv_sec + secs; 5375 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 5376 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 5377 absTime->tv_nsec -= NANOSECS_PER_SEC; 5378 ++absTime->tv_sec; // note: this must be <= max_secs 5379 } 5380 } 5381 } 5382 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 5383 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 5384 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 5385 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 5386 } 5387 5388 void Parker::park(bool isAbsolute, jlong time) { 5389 // Ideally we'd do something useful while spinning, such 5390 // as calling unpackTime(). 5391 5392 // Optional fast-path check: 5393 // Return immediately if a permit is available. 5394 // We depend on Atomic::xchg() having full barrier semantics 5395 // since we are doing a lock-free update to _counter. 5396 if (Atomic::xchg(0, &_counter) > 0) return; 5397 5398 // Optional fast-exit: Check interrupt before trying to wait 5399 Thread* thread = Thread::current(); 5400 assert(thread->is_Java_thread(), "Must be JavaThread"); 5401 JavaThread *jt = (JavaThread *)thread; 5402 if (Thread::is_interrupted(thread, false)) { 5403 return; 5404 } 5405 5406 // First, demultiplex/decode time arguments 5407 timespec absTime; 5408 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all 5409 return; 5410 } 5411 if (time > 0) { 5412 // Warning: this code might be exposed to the old Solaris time 5413 // round-down bugs. Grep "roundingFix" for details. 5414 unpackTime(&absTime, isAbsolute, time); 5415 } 5416 5417 // Enter safepoint region 5418 // Beware of deadlocks such as 6317397. 5419 // The per-thread Parker:: _mutex is a classic leaf-lock. 5420 // In particular a thread must never block on the Threads_lock while 5421 // holding the Parker:: mutex. If safepoints are pending both the 5422 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 5423 ThreadBlockInVM tbivm(jt); 5424 5425 // Don't wait if cannot get lock since interference arises from 5426 // unblocking. Also. check interrupt before trying wait 5427 if (Thread::is_interrupted(thread, false) || 5428 os::Solaris::mutex_trylock(_mutex) != 0) { 5429 return; 5430 } 5431 5432 int status; 5433 5434 if (_counter > 0) { // no wait needed 5435 _counter = 0; 5436 status = os::Solaris::mutex_unlock(_mutex); 5437 assert(status == 0, "invariant"); 5438 // Paranoia to ensure our locked and lock-free paths interact 5439 // correctly with each other and Java-level accesses. 5440 OrderAccess::fence(); 5441 return; 5442 } 5443 5444 #ifdef ASSERT 5445 // Don't catch signals while blocked; let the running threads have the signals. 5446 // (This allows a debugger to break into the running thread.) 5447 sigset_t oldsigs; 5448 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals(); 5449 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 5450 #endif 5451 5452 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5453 jt->set_suspend_equivalent(); 5454 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 5455 5456 // Do this the hard way by blocking ... 5457 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5458 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5459 // Only for SPARC >= V8PlusA 5460 #if defined(__sparc) && defined(COMPILER2) 5461 if (ClearFPUAtPark) { _mark_fpu_nosave(); } 5462 #endif 5463 5464 if (time == 0) { 5465 status = os::Solaris::cond_wait(_cond, _mutex); 5466 } else { 5467 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 5468 } 5469 // Note that an untimed cond_wait() can sometimes return ETIME on older 5470 // versions of the Solaris. 5471 assert_status(status == 0 || status == EINTR || 5472 status == ETIME || status == ETIMEDOUT, 5473 status, "cond_timedwait"); 5474 5475 #ifdef ASSERT 5476 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); 5477 #endif 5478 _counter = 0; 5479 status = os::Solaris::mutex_unlock(_mutex); 5480 assert_status(status == 0, status, "mutex_unlock"); 5481 // Paranoia to ensure our locked and lock-free paths interact 5482 // correctly with each other and Java-level accesses. 5483 OrderAccess::fence(); 5484 5485 // If externally suspended while waiting, re-suspend 5486 if (jt->handle_special_suspend_equivalent_condition()) { 5487 jt->java_suspend_self(); 5488 } 5489 } 5490 5491 void Parker::unpark() { 5492 int status = os::Solaris::mutex_lock(_mutex); 5493 assert(status == 0, "invariant"); 5494 const int s = _counter; 5495 _counter = 1; 5496 status = os::Solaris::mutex_unlock(_mutex); 5497 assert(status == 0, "invariant"); 5498 5499 if (s < 1) { 5500 status = os::Solaris::cond_signal(_cond); 5501 assert(status == 0, "invariant"); 5502 } 5503 } 5504 5505 extern char** environ; 5506 5507 // Run the specified command in a separate process. Return its exit value, 5508 // or -1 on failure (e.g. can't fork a new process). 5509 // Unlike system(), this function can be called from signal handler. It 5510 // doesn't block SIGINT et al. 5511 int os::fork_and_exec(char* cmd) { 5512 char * argv[4]; 5513 argv[0] = (char *)"sh"; 5514 argv[1] = (char *)"-c"; 5515 argv[2] = cmd; 5516 argv[3] = NULL; 5517 5518 // fork is async-safe, fork1 is not so can't use in signal handler 5519 pid_t pid; 5520 Thread* t = Thread::current_or_null_safe(); 5521 if (t != NULL && t->is_inside_signal_handler()) { 5522 pid = fork(); 5523 } else { 5524 pid = fork1(); 5525 } 5526 5527 if (pid < 0) { 5528 // fork failed 5529 warning("fork failed: %s", os::strerror(errno)); 5530 return -1; 5531 5532 } else if (pid == 0) { 5533 // child process 5534 5535 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 5536 execve("/usr/bin/sh", argv, environ); 5537 5538 // execve failed 5539 _exit(-1); 5540 5541 } else { 5542 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5543 // care about the actual exit code, for now. 5544 5545 int status; 5546 5547 // Wait for the child process to exit. This returns immediately if 5548 // the child has already exited. */ 5549 while (waitpid(pid, &status, 0) < 0) { 5550 switch (errno) { 5551 case ECHILD: return 0; 5552 case EINTR: break; 5553 default: return -1; 5554 } 5555 } 5556 5557 if (WIFEXITED(status)) { 5558 // The child exited normally; get its exit code. 5559 return WEXITSTATUS(status); 5560 } else if (WIFSIGNALED(status)) { 5561 // The child exited because of a signal 5562 // The best value to return is 0x80 + signal number, 5563 // because that is what all Unix shells do, and because 5564 // it allows callers to distinguish between process exit and 5565 // process death by signal. 5566 return 0x80 + WTERMSIG(status); 5567 } else { 5568 // Unknown exit code; pass it through 5569 return status; 5570 } 5571 } 5572 } 5573 5574 // is_headless_jre() 5575 // 5576 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 5577 // in order to report if we are running in a headless jre 5578 // 5579 // Since JDK8 xawt/libmawt.so was moved into the same directory 5580 // as libawt.so, and renamed libawt_xawt.so 5581 // 5582 bool os::is_headless_jre() { 5583 struct stat statbuf; 5584 char buf[MAXPATHLEN]; 5585 char libmawtpath[MAXPATHLEN]; 5586 const char *xawtstr = "/xawt/libmawt.so"; 5587 const char *new_xawtstr = "/libawt_xawt.so"; 5588 char *p; 5589 5590 // Get path to libjvm.so 5591 os::jvm_path(buf, sizeof(buf)); 5592 5593 // Get rid of libjvm.so 5594 p = strrchr(buf, '/'); 5595 if (p == NULL) { 5596 return false; 5597 } else { 5598 *p = '\0'; 5599 } 5600 5601 // Get rid of client or server 5602 p = strrchr(buf, '/'); 5603 if (p == NULL) { 5604 return false; 5605 } else { 5606 *p = '\0'; 5607 } 5608 5609 // check xawt/libmawt.so 5610 strcpy(libmawtpath, buf); 5611 strcat(libmawtpath, xawtstr); 5612 if (::stat(libmawtpath, &statbuf) == 0) return false; 5613 5614 // check libawt_xawt.so 5615 strcpy(libmawtpath, buf); 5616 strcat(libmawtpath, new_xawtstr); 5617 if (::stat(libmawtpath, &statbuf) == 0) return false; 5618 5619 return true; 5620 } 5621 5622 size_t os::write(int fd, const void *buf, unsigned int nBytes) { 5623 size_t res; 5624 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res); 5625 return res; 5626 } 5627 5628 int os::close(int fd) { 5629 return ::close(fd); 5630 } 5631 5632 int os::socket_close(int fd) { 5633 return ::close(fd); 5634 } 5635 5636 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5637 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5638 "Assumed _thread_in_native"); 5639 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags)); 5640 } 5641 5642 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5643 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5644 "Assumed _thread_in_native"); 5645 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5646 } 5647 5648 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5649 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5650 } 5651 5652 // As both poll and select can be interrupted by signals, we have to be 5653 // prepared to restart the system call after updating the timeout, unless 5654 // a poll() is done with timeout == -1, in which case we repeat with this 5655 // "wait forever" value. 5656 5657 int os::connect(int fd, struct sockaddr *him, socklen_t len) { 5658 int _result; 5659 _result = ::connect(fd, him, len); 5660 5661 // On Solaris, when a connect() call is interrupted, the connection 5662 // can be established asynchronously (see 6343810). Subsequent calls 5663 // to connect() must check the errno value which has the semantic 5664 // described below (copied from the connect() man page). Handling 5665 // of asynchronously established connections is required for both 5666 // blocking and non-blocking sockets. 5667 // EINTR The connection attempt was interrupted 5668 // before any data arrived by the delivery of 5669 // a signal. The connection, however, will be 5670 // established asynchronously. 5671 // 5672 // EINPROGRESS The socket is non-blocking, and the connec- 5673 // tion cannot be completed immediately. 5674 // 5675 // EALREADY The socket is non-blocking, and a previous 5676 // connection attempt has not yet been com- 5677 // pleted. 5678 // 5679 // EISCONN The socket is already connected. 5680 if (_result == OS_ERR && errno == EINTR) { 5681 // restarting a connect() changes its errno semantics 5682 RESTARTABLE(::connect(fd, him, len), _result); 5683 // undo these changes 5684 if (_result == OS_ERR) { 5685 if (errno == EALREADY) { 5686 errno = EINPROGRESS; // fall through 5687 } else if (errno == EISCONN) { 5688 errno = 0; 5689 return OS_OK; 5690 } 5691 } 5692 } 5693 return _result; 5694 } 5695 5696 // Get the default path to the core file 5697 // Returns the length of the string 5698 int os::get_core_path(char* buffer, size_t bufferSize) { 5699 const char* p = get_current_directory(buffer, bufferSize); 5700 5701 if (p == NULL) { 5702 assert(p != NULL, "failed to get current directory"); 5703 return 0; 5704 } 5705 5706 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 5707 p, current_process_id()); 5708 5709 return strlen(buffer); 5710 } 5711 5712 #ifndef PRODUCT 5713 void TestReserveMemorySpecial_test() { 5714 // No tests available for this platform 5715 } 5716 #endif 5717 5718 bool os::start_debugging(char *buf, int buflen) { 5719 int len = (int)strlen(buf); 5720 char *p = &buf[len]; 5721 5722 jio_snprintf(p, buflen-len, 5723 "\n\n" 5724 "Do you want to debug the problem?\n\n" 5725 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n" 5726 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 5727 "Otherwise, press RETURN to abort...", 5728 os::current_process_id(), os::current_thread_id()); 5729 5730 bool yes = os::message_box("Unexpected Error", buf); 5731 5732 if (yes) { 5733 // yes, user asked VM to launch debugger 5734 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id()); 5735 5736 os::fork_and_exec(buf); 5737 yes = false; 5738 } 5739 return yes; 5740 }