1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // no precompiled headers 26 #include "classfile/classLoader.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "classfile/vmSymbols.hpp" 29 #include "code/icBuffer.hpp" 30 #include "code/vtableStubs.hpp" 31 #include "compiler/compileBroker.hpp" 32 #include "compiler/disassembler.hpp" 33 #include "interpreter/interpreter.hpp" 34 #include "jvm_solaris.h" 35 #include "logging/log.hpp" 36 #include "memory/allocation.inline.hpp" 37 #include "memory/filemap.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "os_share_solaris.hpp" 40 #include "os_solaris.inline.hpp" 41 #include "prims/jniFastGetField.hpp" 42 #include "prims/jvm.h" 43 #include "prims/jvm_misc.hpp" 44 #include "runtime/arguments.hpp" 45 #include "runtime/atomic.hpp" 46 #include "runtime/extendedPC.hpp" 47 #include "runtime/globals.hpp" 48 #include "runtime/interfaceSupport.hpp" 49 #include "runtime/java.hpp" 50 #include "runtime/javaCalls.hpp" 51 #include "runtime/mutexLocker.hpp" 52 #include "runtime/objectMonitor.hpp" 53 #include "runtime/orderAccess.inline.hpp" 54 #include "runtime/osThread.hpp" 55 #include "runtime/perfMemory.hpp" 56 #include "runtime/sharedRuntime.hpp" 57 #include "runtime/statSampler.hpp" 58 #include "runtime/stubRoutines.hpp" 59 #include "runtime/thread.inline.hpp" 60 #include "runtime/threadCritical.hpp" 61 #include "runtime/timer.hpp" 62 #include "runtime/vm_version.hpp" 63 #include "semaphore_posix.hpp" 64 #include "services/attachListener.hpp" 65 #include "services/memTracker.hpp" 66 #include "services/runtimeService.hpp" 67 #include "utilities/decoder.hpp" 68 #include "utilities/defaultStream.hpp" 69 #include "utilities/events.hpp" 70 #include "utilities/growableArray.hpp" 71 #include "utilities/macros.hpp" 72 #include "utilities/vmError.hpp" 73 74 // put OS-includes here 75 # include <dlfcn.h> 76 # include <errno.h> 77 # include <exception> 78 # include <link.h> 79 # include <poll.h> 80 # include <pthread.h> 81 # include <schedctl.h> 82 # include <setjmp.h> 83 # include <signal.h> 84 # include <stdio.h> 85 # include <alloca.h> 86 # include <sys/filio.h> 87 # include <sys/ipc.h> 88 # include <sys/lwp.h> 89 # include <sys/machelf.h> // for elf Sym structure used by dladdr1 90 # include <sys/mman.h> 91 # include <sys/processor.h> 92 # include <sys/procset.h> 93 # include <sys/pset.h> 94 # include <sys/resource.h> 95 # include <sys/shm.h> 96 # include <sys/socket.h> 97 # include <sys/stat.h> 98 # include <sys/systeminfo.h> 99 # include <sys/time.h> 100 # include <sys/times.h> 101 # include <sys/types.h> 102 # include <sys/wait.h> 103 # include <sys/utsname.h> 104 # include <thread.h> 105 # include <unistd.h> 106 # include <sys/priocntl.h> 107 # include <sys/rtpriocntl.h> 108 # include <sys/tspriocntl.h> 109 # include <sys/iapriocntl.h> 110 # include <sys/fxpriocntl.h> 111 # include <sys/loadavg.h> 112 # include <string.h> 113 # include <stdio.h> 114 115 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 116 # include <sys/procfs.h> // see comment in <sys/procfs.h> 117 118 #define MAX_PATH (2 * K) 119 120 // for timer info max values which include all bits 121 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 122 123 124 // Here are some liblgrp types from sys/lgrp_user.h to be able to 125 // compile on older systems without this header file. 126 127 #ifndef MADV_ACCESS_LWP 128 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */ 129 #endif 130 #ifndef MADV_ACCESS_MANY 131 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */ 132 #endif 133 134 #ifndef LGRP_RSRC_CPU 135 #define LGRP_RSRC_CPU 0 /* CPU resources */ 136 #endif 137 #ifndef LGRP_RSRC_MEM 138 #define LGRP_RSRC_MEM 1 /* memory resources */ 139 #endif 140 141 // Values for ThreadPriorityPolicy == 1 142 int prio_policy1[CriticalPriority+1] = { 143 -99999, 0, 16, 32, 48, 64, 144 80, 96, 112, 124, 127, 127 }; 145 146 // System parameters used internally 147 static clock_t clock_tics_per_sec = 100; 148 149 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+) 150 static bool enabled_extended_FILE_stdio = false; 151 152 // For diagnostics to print a message once. see run_periodic_checks 153 static bool check_addr0_done = false; 154 static sigset_t check_signal_done; 155 static bool check_signals = true; 156 157 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo 158 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo 159 160 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround 161 162 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL; 163 164 // "default" initializers for missing libc APIs 165 extern "C" { 166 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 167 static int lwp_mutex_destroy(mutex_t *mx) { return 0; } 168 169 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 170 static int lwp_cond_destroy(cond_t *cv) { return 0; } 171 } 172 173 // "default" initializers for pthread-based synchronization 174 extern "C" { 175 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 176 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 177 } 178 179 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); 180 181 static inline size_t adjust_stack_size(address base, size_t size) { 182 if ((ssize_t)size < 0) { 183 // 4759953: Compensate for ridiculous stack size. 184 size = max_intx; 185 } 186 if (size > (size_t)base) { 187 // 4812466: Make sure size doesn't allow the stack to wrap the address space. 188 size = (size_t)base; 189 } 190 return size; 191 } 192 193 static inline stack_t get_stack_info() { 194 stack_t st; 195 int retval = thr_stksegment(&st); 196 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); 197 assert(retval == 0, "incorrect return value from thr_stksegment"); 198 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 199 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 200 return st; 201 } 202 203 address os::current_stack_base() { 204 int r = thr_main(); 205 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 206 bool is_primordial_thread = r; 207 208 // Workaround 4352906, avoid calls to thr_stksegment by 209 // thr_main after the first one (it looks like we trash 210 // some data, causing the value for ss_sp to be incorrect). 211 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) { 212 stack_t st = get_stack_info(); 213 if (is_primordial_thread) { 214 // cache initial value of stack base 215 os::Solaris::_main_stack_base = (address)st.ss_sp; 216 } 217 return (address)st.ss_sp; 218 } else { 219 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); 220 return os::Solaris::_main_stack_base; 221 } 222 } 223 224 size_t os::current_stack_size() { 225 size_t size; 226 227 int r = thr_main(); 228 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 229 if (!r) { 230 size = get_stack_info().ss_size; 231 } else { 232 struct rlimit limits; 233 getrlimit(RLIMIT_STACK, &limits); 234 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); 235 } 236 // base may not be page aligned 237 address base = current_stack_base(); 238 address bottom = align_up(base - size, os::vm_page_size());; 239 return (size_t)(base - bottom); 240 } 241 242 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 243 return localtime_r(clock, res); 244 } 245 246 void os::Solaris::try_enable_extended_io() { 247 typedef int (*enable_extended_FILE_stdio_t)(int, int); 248 249 if (!UseExtendedFileIO) { 250 return; 251 } 252 253 enable_extended_FILE_stdio_t enabler = 254 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT, 255 "enable_extended_FILE_stdio"); 256 if (enabler) { 257 enabler(-1, -1); 258 } 259 } 260 261 static int _processors_online = 0; 262 263 jint os::Solaris::_os_thread_limit = 0; 264 volatile jint os::Solaris::_os_thread_count = 0; 265 266 julong os::available_memory() { 267 return Solaris::available_memory(); 268 } 269 270 julong os::Solaris::available_memory() { 271 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); 272 } 273 274 julong os::Solaris::_physical_memory = 0; 275 276 julong os::physical_memory() { 277 return Solaris::physical_memory(); 278 } 279 280 static hrtime_t first_hrtime = 0; 281 static const hrtime_t hrtime_hz = 1000*1000*1000; 282 static volatile hrtime_t max_hrtime = 0; 283 284 285 void os::Solaris::initialize_system_info() { 286 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); 287 _processors_online = sysconf(_SC_NPROCESSORS_ONLN); 288 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * 289 (julong)sysconf(_SC_PAGESIZE); 290 } 291 292 int os::active_processor_count() { 293 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 294 pid_t pid = getpid(); 295 psetid_t pset = PS_NONE; 296 // Are we running in a processor set or is there any processor set around? 297 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) { 298 uint_t pset_cpus; 299 // Query the number of cpus available to us. 300 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) { 301 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check"); 302 _processors_online = pset_cpus; 303 return pset_cpus; 304 } 305 } 306 // Otherwise return number of online cpus 307 return online_cpus; 308 } 309 310 static bool find_processors_in_pset(psetid_t pset, 311 processorid_t** id_array, 312 uint_t* id_length) { 313 bool result = false; 314 // Find the number of processors in the processor set. 315 if (pset_info(pset, NULL, id_length, NULL) == 0) { 316 // Make up an array to hold their ids. 317 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 318 // Fill in the array with their processor ids. 319 if (pset_info(pset, NULL, id_length, *id_array) == 0) { 320 result = true; 321 } 322 } 323 return result; 324 } 325 326 // Callers of find_processors_online() must tolerate imprecise results -- 327 // the system configuration can change asynchronously because of DR 328 // or explicit psradm operations. 329 // 330 // We also need to take care that the loop (below) terminates as the 331 // number of processors online can change between the _SC_NPROCESSORS_ONLN 332 // request and the loop that builds the list of processor ids. Unfortunately 333 // there's no reliable way to determine the maximum valid processor id, 334 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online 335 // man pages, which claim the processor id set is "sparse, but 336 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually 337 // exit the loop. 338 // 339 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's 340 // not available on S8.0. 341 342 static bool find_processors_online(processorid_t** id_array, 343 uint* id_length) { 344 const processorid_t MAX_PROCESSOR_ID = 100000; 345 // Find the number of processors online. 346 *id_length = sysconf(_SC_NPROCESSORS_ONLN); 347 // Make up an array to hold their ids. 348 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 349 // Processors need not be numbered consecutively. 350 long found = 0; 351 processorid_t next = 0; 352 while (found < *id_length && next < MAX_PROCESSOR_ID) { 353 processor_info_t info; 354 if (processor_info(next, &info) == 0) { 355 // NB, PI_NOINTR processors are effectively online ... 356 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) { 357 (*id_array)[found] = next; 358 found += 1; 359 } 360 } 361 next += 1; 362 } 363 if (found < *id_length) { 364 // The loop above didn't identify the expected number of processors. 365 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN) 366 // and re-running the loop, above, but there's no guarantee of progress 367 // if the system configuration is in flux. Instead, we just return what 368 // we've got. Note that in the worst case find_processors_online() could 369 // return an empty set. (As a fall-back in the case of the empty set we 370 // could just return the ID of the current processor). 371 *id_length = found; 372 } 373 374 return true; 375 } 376 377 static bool assign_distribution(processorid_t* id_array, 378 uint id_length, 379 uint* distribution, 380 uint distribution_length) { 381 // We assume we can assign processorid_t's to uint's. 382 assert(sizeof(processorid_t) == sizeof(uint), 383 "can't convert processorid_t to uint"); 384 // Quick check to see if we won't succeed. 385 if (id_length < distribution_length) { 386 return false; 387 } 388 // Assign processor ids to the distribution. 389 // Try to shuffle processors to distribute work across boards, 390 // assuming 4 processors per board. 391 const uint processors_per_board = ProcessDistributionStride; 392 // Find the maximum processor id. 393 processorid_t max_id = 0; 394 for (uint m = 0; m < id_length; m += 1) { 395 max_id = MAX2(max_id, id_array[m]); 396 } 397 // The next id, to limit loops. 398 const processorid_t limit_id = max_id + 1; 399 // Make up markers for available processors. 400 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal); 401 for (uint c = 0; c < limit_id; c += 1) { 402 available_id[c] = false; 403 } 404 for (uint a = 0; a < id_length; a += 1) { 405 available_id[id_array[a]] = true; 406 } 407 // Step by "boards", then by "slot", copying to "assigned". 408 // NEEDS_CLEANUP: The assignment of processors should be stateful, 409 // remembering which processors have been assigned by 410 // previous calls, etc., so as to distribute several 411 // independent calls of this method. What we'd like is 412 // It would be nice to have an API that let us ask 413 // how many processes are bound to a processor, 414 // but we don't have that, either. 415 // In the short term, "board" is static so that 416 // subsequent distributions don't all start at board 0. 417 static uint board = 0; 418 uint assigned = 0; 419 // Until we've found enough processors .... 420 while (assigned < distribution_length) { 421 // ... find the next available processor in the board. 422 for (uint slot = 0; slot < processors_per_board; slot += 1) { 423 uint try_id = board * processors_per_board + slot; 424 if ((try_id < limit_id) && (available_id[try_id] == true)) { 425 distribution[assigned] = try_id; 426 available_id[try_id] = false; 427 assigned += 1; 428 break; 429 } 430 } 431 board += 1; 432 if (board * processors_per_board + 0 >= limit_id) { 433 board = 0; 434 } 435 } 436 if (available_id != NULL) { 437 FREE_C_HEAP_ARRAY(bool, available_id); 438 } 439 return true; 440 } 441 442 void os::set_native_thread_name(const char *name) { 443 if (Solaris::_pthread_setname_np != NULL) { 444 // Only the first 31 bytes of 'name' are processed by pthread_setname_np 445 // but we explicitly copy into a size-limited buffer to avoid any 446 // possible overflow. 447 char buf[32]; 448 snprintf(buf, sizeof(buf), "%s", name); 449 buf[sizeof(buf) - 1] = '\0'; 450 Solaris::_pthread_setname_np(pthread_self(), buf); 451 } 452 } 453 454 bool os::distribute_processes(uint length, uint* distribution) { 455 bool result = false; 456 // Find the processor id's of all the available CPUs. 457 processorid_t* id_array = NULL; 458 uint id_length = 0; 459 // There are some races between querying information and using it, 460 // since processor sets can change dynamically. 461 psetid_t pset = PS_NONE; 462 // Are we running in a processor set? 463 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) { 464 result = find_processors_in_pset(pset, &id_array, &id_length); 465 } else { 466 result = find_processors_online(&id_array, &id_length); 467 } 468 if (result == true) { 469 if (id_length >= length) { 470 result = assign_distribution(id_array, id_length, distribution, length); 471 } else { 472 result = false; 473 } 474 } 475 if (id_array != NULL) { 476 FREE_C_HEAP_ARRAY(processorid_t, id_array); 477 } 478 return result; 479 } 480 481 bool os::bind_to_processor(uint processor_id) { 482 // We assume that a processorid_t can be stored in a uint. 483 assert(sizeof(uint) == sizeof(processorid_t), 484 "can't convert uint to processorid_t"); 485 int bind_result = 486 processor_bind(P_LWPID, // bind LWP. 487 P_MYID, // bind current LWP. 488 (processorid_t) processor_id, // id. 489 NULL); // don't return old binding. 490 return (bind_result == 0); 491 } 492 493 // Return true if user is running as root. 494 495 bool os::have_special_privileges() { 496 static bool init = false; 497 static bool privileges = false; 498 if (!init) { 499 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 500 init = true; 501 } 502 return privileges; 503 } 504 505 506 void os::init_system_properties_values() { 507 // The next steps are taken in the product version: 508 // 509 // Obtain the JAVA_HOME value from the location of libjvm.so. 510 // This library should be located at: 511 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 512 // 513 // If "/jre/lib/" appears at the right place in the path, then we 514 // assume libjvm.so is installed in a JDK and we use this path. 515 // 516 // Otherwise exit with message: "Could not create the Java virtual machine." 517 // 518 // The following extra steps are taken in the debugging version: 519 // 520 // If "/jre/lib/" does NOT appear at the right place in the path 521 // instead of exit check for $JAVA_HOME environment variable. 522 // 523 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 524 // then we append a fake suffix "hotspot/libjvm.so" to this path so 525 // it looks like libjvm.so is installed there 526 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 527 // 528 // Otherwise exit. 529 // 530 // Important note: if the location of libjvm.so changes this 531 // code needs to be changed accordingly. 532 533 // Base path of extensions installed on the system. 534 #define SYS_EXT_DIR "/usr/jdk/packages" 535 #define EXTENSIONS_DIR "/lib/ext" 536 537 // Buffer that fits several sprintfs. 538 // Note that the space for the colon and the trailing null are provided 539 // by the nulls included by the sizeof operator. 540 const size_t bufsize = 541 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends. 542 sizeof(SYS_EXT_DIR) + sizeof("/lib/"), // invariant ld_library_path 543 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir 544 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 545 546 // sysclasspath, java_home, dll_dir 547 { 548 char *pslash; 549 os::jvm_path(buf, bufsize); 550 551 // Found the full path to libjvm.so. 552 // Now cut the path to <java_home>/jre if we can. 553 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 554 pslash = strrchr(buf, '/'); 555 if (pslash != NULL) { 556 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 557 } 558 Arguments::set_dll_dir(buf); 559 560 if (pslash != NULL) { 561 pslash = strrchr(buf, '/'); 562 if (pslash != NULL) { 563 *pslash = '\0'; // Get rid of /lib. 564 } 565 } 566 Arguments::set_java_home(buf); 567 set_boot_path('/', ':'); 568 } 569 570 // Where to look for native libraries. 571 { 572 // Use dlinfo() to determine the correct java.library.path. 573 // 574 // If we're launched by the Java launcher, and the user 575 // does not set java.library.path explicitly on the commandline, 576 // the Java launcher sets LD_LIBRARY_PATH for us and unsets 577 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case 578 // dlinfo returns LD_LIBRARY_PATH + crle settings (including 579 // /usr/lib), which is exactly what we want. 580 // 581 // If the user does set java.library.path, it completely 582 // overwrites this setting, and always has. 583 // 584 // If we're not launched by the Java launcher, we may 585 // get here with any/all of the LD_LIBRARY_PATH[_32|64] 586 // settings. Again, dlinfo does exactly what we want. 587 588 Dl_serinfo info_sz, *info = &info_sz; 589 Dl_serpath *path; 590 char *library_path; 591 char *common_path = buf; 592 593 // Determine search path count and required buffer size. 594 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) { 595 FREE_C_HEAP_ARRAY(char, buf); 596 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror()); 597 } 598 599 // Allocate new buffer and initialize. 600 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal); 601 info->dls_size = info_sz.dls_size; 602 info->dls_cnt = info_sz.dls_cnt; 603 604 // Obtain search path information. 605 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) { 606 FREE_C_HEAP_ARRAY(char, buf); 607 FREE_C_HEAP_ARRAY(char, info); 608 vm_exit_during_initialization("dlinfo SERINFO request", dlerror()); 609 } 610 611 path = &info->dls_serpath[0]; 612 613 // Note: Due to a legacy implementation, most of the library path 614 // is set in the launcher. This was to accomodate linking restrictions 615 // on legacy Solaris implementations (which are no longer supported). 616 // Eventually, all the library path setting will be done here. 617 // 618 // However, to prevent the proliferation of improperly built native 619 // libraries, the new path component /usr/jdk/packages is added here. 620 621 // Construct the invariant part of ld_library_path. 622 sprintf(common_path, SYS_EXT_DIR "/lib"); 623 624 // Struct size is more than sufficient for the path components obtained 625 // through the dlinfo() call, so only add additional space for the path 626 // components explicitly added here. 627 size_t library_path_size = info->dls_size + strlen(common_path); 628 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal); 629 library_path[0] = '\0'; 630 631 // Construct the desired Java library path from the linker's library 632 // search path. 633 // 634 // For compatibility, it is optimal that we insert the additional path 635 // components specific to the Java VM after those components specified 636 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so 637 // infrastructure. 638 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it. 639 strcpy(library_path, common_path); 640 } else { 641 int inserted = 0; 642 int i; 643 for (i = 0; i < info->dls_cnt; i++, path++) { 644 uint_t flags = path->dls_flags & LA_SER_MASK; 645 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) { 646 strcat(library_path, common_path); 647 strcat(library_path, os::path_separator()); 648 inserted = 1; 649 } 650 strcat(library_path, path->dls_name); 651 strcat(library_path, os::path_separator()); 652 } 653 // Eliminate trailing path separator. 654 library_path[strlen(library_path)-1] = '\0'; 655 } 656 657 // happens before argument parsing - can't use a trace flag 658 // tty->print_raw("init_system_properties_values: native lib path: "); 659 // tty->print_raw_cr(library_path); 660 661 // Callee copies into its own buffer. 662 Arguments::set_library_path(library_path); 663 664 FREE_C_HEAP_ARRAY(char, library_path); 665 FREE_C_HEAP_ARRAY(char, info); 666 } 667 668 // Extensions directories. 669 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); 670 Arguments::set_ext_dirs(buf); 671 672 FREE_C_HEAP_ARRAY(char, buf); 673 674 #undef SYS_EXT_DIR 675 #undef EXTENSIONS_DIR 676 } 677 678 void os::breakpoint() { 679 BREAKPOINT; 680 } 681 682 bool os::obsolete_option(const JavaVMOption *option) { 683 if (!strncmp(option->optionString, "-Xt", 3)) { 684 return true; 685 } else if (!strncmp(option->optionString, "-Xtm", 4)) { 686 return true; 687 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) { 688 return true; 689 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) { 690 return true; 691 } 692 return false; 693 } 694 695 bool os::Solaris::valid_stack_address(Thread* thread, address sp) { 696 address stackStart = (address)thread->stack_base(); 697 address stackEnd = (address)(stackStart - (address)thread->stack_size()); 698 if (sp < stackStart && sp >= stackEnd) return true; 699 return false; 700 } 701 702 extern "C" void breakpoint() { 703 // use debugger to set breakpoint here 704 } 705 706 static thread_t main_thread; 707 708 // Thread start routine for all newly created threads 709 extern "C" void* thread_native_entry(void* thread_addr) { 710 // Try to randomize the cache line index of hot stack frames. 711 // This helps when threads of the same stack traces evict each other's 712 // cache lines. The threads can be either from the same JVM instance, or 713 // from different JVM instances. The benefit is especially true for 714 // processors with hyperthreading technology. 715 static int counter = 0; 716 int pid = os::current_process_id(); 717 alloca(((pid ^ counter++) & 7) * 128); 718 719 int prio; 720 Thread* thread = (Thread*)thread_addr; 721 722 thread->initialize_thread_current(); 723 724 OSThread* osthr = thread->osthread(); 725 726 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound 727 thread->_schedctl = (void *) schedctl_init(); 728 729 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", 730 os::current_thread_id()); 731 732 if (UseNUMA) { 733 int lgrp_id = os::numa_get_group_id(); 734 if (lgrp_id != -1) { 735 thread->set_lgrp_id(lgrp_id); 736 } 737 } 738 739 // Our priority was set when we were created, and stored in the 740 // osthread, but couldn't be passed through to our LWP until now. 741 // So read back the priority and set it again. 742 743 if (osthr->thread_id() != -1) { 744 if (UseThreadPriorities) { 745 int prio = osthr->native_priority(); 746 if (ThreadPriorityVerbose) { 747 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " 748 INTPTR_FORMAT ", setting priority: %d\n", 749 osthr->thread_id(), osthr->lwp_id(), prio); 750 } 751 os::set_native_priority(thread, prio); 752 } 753 } else if (ThreadPriorityVerbose) { 754 warning("Can't set priority in _start routine, thread id hasn't been set\n"); 755 } 756 757 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 758 759 // initialize signal mask for this thread 760 os::Solaris::hotspot_sigmask(thread); 761 762 thread->run(); 763 764 // One less thread is executing 765 // When the VMThread gets here, the main thread may have already exited 766 // which frees the CodeHeap containing the Atomic::dec code 767 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 768 Atomic::dec(&os::Solaris::_os_thread_count); 769 } 770 771 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id()); 772 773 // If a thread has not deleted itself ("delete this") as part of its 774 // termination sequence, we have to ensure thread-local-storage is 775 // cleared before we actually terminate. No threads should ever be 776 // deleted asynchronously with respect to their termination. 777 if (Thread::current_or_null_safe() != NULL) { 778 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 779 thread->clear_thread_current(); 780 } 781 782 if (UseDetachedThreads) { 783 thr_exit(NULL); 784 ShouldNotReachHere(); 785 } 786 return NULL; 787 } 788 789 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) { 790 // Allocate the OSThread object 791 OSThread* osthread = new OSThread(NULL, NULL); 792 if (osthread == NULL) return NULL; 793 794 // Store info on the Solaris thread into the OSThread 795 osthread->set_thread_id(thread_id); 796 osthread->set_lwp_id(_lwp_self()); 797 thread->_schedctl = (void *) schedctl_init(); 798 799 if (UseNUMA) { 800 int lgrp_id = os::numa_get_group_id(); 801 if (lgrp_id != -1) { 802 thread->set_lgrp_id(lgrp_id); 803 } 804 } 805 806 if (ThreadPriorityVerbose) { 807 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n", 808 osthread->thread_id(), osthread->lwp_id()); 809 } 810 811 // Initial thread state is INITIALIZED, not SUSPENDED 812 osthread->set_state(INITIALIZED); 813 814 return osthread; 815 } 816 817 void os::Solaris::hotspot_sigmask(Thread* thread) { 818 //Save caller's signal mask 819 sigset_t sigmask; 820 pthread_sigmask(SIG_SETMASK, NULL, &sigmask); 821 OSThread *osthread = thread->osthread(); 822 osthread->set_caller_sigmask(sigmask); 823 824 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL); 825 if (!ReduceSignalUsage) { 826 if (thread->is_VM_thread()) { 827 // Only the VM thread handles BREAK_SIGNAL ... 828 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 829 } else { 830 // ... all other threads block BREAK_SIGNAL 831 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked"); 832 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 833 } 834 } 835 } 836 837 bool os::create_attached_thread(JavaThread* thread) { 838 #ifdef ASSERT 839 thread->verify_not_published(); 840 #endif 841 OSThread* osthread = create_os_thread(thread, thr_self()); 842 if (osthread == NULL) { 843 return false; 844 } 845 846 // Initial thread state is RUNNABLE 847 osthread->set_state(RUNNABLE); 848 thread->set_osthread(osthread); 849 850 // initialize signal mask for this thread 851 // and save the caller's signal mask 852 os::Solaris::hotspot_sigmask(thread); 853 854 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").", 855 os::current_thread_id()); 856 857 return true; 858 } 859 860 bool os::create_main_thread(JavaThread* thread) { 861 #ifdef ASSERT 862 thread->verify_not_published(); 863 #endif 864 if (_starting_thread == NULL) { 865 _starting_thread = create_os_thread(thread, main_thread); 866 if (_starting_thread == NULL) { 867 return false; 868 } 869 } 870 871 // The primodial thread is runnable from the start 872 _starting_thread->set_state(RUNNABLE); 873 874 thread->set_osthread(_starting_thread); 875 876 // initialize signal mask for this thread 877 // and save the caller's signal mask 878 os::Solaris::hotspot_sigmask(thread); 879 880 return true; 881 } 882 883 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr() 884 static char* describe_thr_create_attributes(char* buf, size_t buflen, 885 size_t stacksize, long flags) { 886 stringStream ss(buf, buflen); 887 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024); 888 ss.print("flags: "); 889 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " "); 890 #define ALL(X) \ 891 X(THR_SUSPENDED) \ 892 X(THR_DETACHED) \ 893 X(THR_BOUND) \ 894 X(THR_NEW_LWP) \ 895 X(THR_DAEMON) 896 ALL(PRINT_FLAG) 897 #undef ALL 898 #undef PRINT_FLAG 899 return buf; 900 } 901 902 // return default stack size for thr_type 903 size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 904 // default stack size when not specified by caller is 1M (2M for LP64) 905 size_t s = (BytesPerWord >> 2) * K * K; 906 return s; 907 } 908 909 bool os::create_thread(Thread* thread, ThreadType thr_type, 910 size_t req_stack_size) { 911 // Allocate the OSThread object 912 OSThread* osthread = new OSThread(NULL, NULL); 913 if (osthread == NULL) { 914 return false; 915 } 916 917 if (ThreadPriorityVerbose) { 918 char *thrtyp; 919 switch (thr_type) { 920 case vm_thread: 921 thrtyp = (char *)"vm"; 922 break; 923 case cgc_thread: 924 thrtyp = (char *)"cgc"; 925 break; 926 case pgc_thread: 927 thrtyp = (char *)"pgc"; 928 break; 929 case java_thread: 930 thrtyp = (char *)"java"; 931 break; 932 case compiler_thread: 933 thrtyp = (char *)"compiler"; 934 break; 935 case watcher_thread: 936 thrtyp = (char *)"watcher"; 937 break; 938 default: 939 thrtyp = (char *)"unknown"; 940 break; 941 } 942 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp); 943 } 944 945 // calculate stack size if it's not specified by caller 946 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 947 948 // Initial state is ALLOCATED but not INITIALIZED 949 osthread->set_state(ALLOCATED); 950 951 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) { 952 // We got lots of threads. Check if we still have some address space left. 953 // Need to be at least 5Mb of unreserved address space. We do check by 954 // trying to reserve some. 955 const size_t VirtualMemoryBangSize = 20*K*K; 956 char* mem = os::reserve_memory(VirtualMemoryBangSize); 957 if (mem == NULL) { 958 delete osthread; 959 return false; 960 } else { 961 // Release the memory again 962 os::release_memory(mem, VirtualMemoryBangSize); 963 } 964 } 965 966 // Setup osthread because the child thread may need it. 967 thread->set_osthread(osthread); 968 969 // Create the Solaris thread 970 thread_t tid = 0; 971 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED; 972 int status; 973 974 // Mark that we don't have an lwp or thread id yet. 975 // In case we attempt to set the priority before the thread starts. 976 osthread->set_lwp_id(-1); 977 osthread->set_thread_id(-1); 978 979 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid); 980 981 char buf[64]; 982 if (status == 0) { 983 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ", 984 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 985 } else { 986 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.", 987 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 988 } 989 990 if (status != 0) { 991 thread->set_osthread(NULL); 992 // Need to clean up stuff we've allocated so far 993 delete osthread; 994 return false; 995 } 996 997 Atomic::inc(&os::Solaris::_os_thread_count); 998 999 // Store info on the Solaris thread into the OSThread 1000 osthread->set_thread_id(tid); 1001 1002 // Remember that we created this thread so we can set priority on it 1003 osthread->set_vm_created(); 1004 1005 // Most thread types will set an explicit priority before starting the thread, 1006 // but for those that don't we need a valid value to read back in thread_native_entry. 1007 osthread->set_native_priority(NormPriority); 1008 1009 // Initial thread state is INITIALIZED, not SUSPENDED 1010 osthread->set_state(INITIALIZED); 1011 1012 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 1013 return true; 1014 } 1015 1016 debug_only(static bool signal_sets_initialized = false); 1017 static sigset_t unblocked_sigs, vm_sigs; 1018 1019 bool os::Solaris::is_sig_ignored(int sig) { 1020 struct sigaction oact; 1021 sigaction(sig, (struct sigaction*)NULL, &oact); 1022 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 1023 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 1024 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) { 1025 return true; 1026 } else { 1027 return false; 1028 } 1029 } 1030 1031 void os::Solaris::signal_sets_init() { 1032 // Should also have an assertion stating we are still single-threaded. 1033 assert(!signal_sets_initialized, "Already initialized"); 1034 // Fill in signals that are necessarily unblocked for all threads in 1035 // the VM. Currently, we unblock the following signals: 1036 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 1037 // by -Xrs (=ReduceSignalUsage)); 1038 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 1039 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 1040 // the dispositions or masks wrt these signals. 1041 // Programs embedding the VM that want to use the above signals for their 1042 // own purposes must, at this time, use the "-Xrs" option to prevent 1043 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 1044 // (See bug 4345157, and other related bugs). 1045 // In reality, though, unblocking these signals is really a nop, since 1046 // these signals are not blocked by default. 1047 sigemptyset(&unblocked_sigs); 1048 sigaddset(&unblocked_sigs, SIGILL); 1049 sigaddset(&unblocked_sigs, SIGSEGV); 1050 sigaddset(&unblocked_sigs, SIGBUS); 1051 sigaddset(&unblocked_sigs, SIGFPE); 1052 sigaddset(&unblocked_sigs, ASYNC_SIGNAL); 1053 1054 if (!ReduceSignalUsage) { 1055 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 1056 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 1057 } 1058 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 1059 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 1060 } 1061 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 1062 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 1063 } 1064 } 1065 // Fill in signals that are blocked by all but the VM thread. 1066 sigemptyset(&vm_sigs); 1067 if (!ReduceSignalUsage) { 1068 sigaddset(&vm_sigs, BREAK_SIGNAL); 1069 } 1070 debug_only(signal_sets_initialized = true); 1071 1072 // For diagnostics only used in run_periodic_checks 1073 sigemptyset(&check_signal_done); 1074 } 1075 1076 // These are signals that are unblocked while a thread is running Java. 1077 // (For some reason, they get blocked by default.) 1078 sigset_t* os::Solaris::unblocked_signals() { 1079 assert(signal_sets_initialized, "Not initialized"); 1080 return &unblocked_sigs; 1081 } 1082 1083 // These are the signals that are blocked while a (non-VM) thread is 1084 // running Java. Only the VM thread handles these signals. 1085 sigset_t* os::Solaris::vm_signals() { 1086 assert(signal_sets_initialized, "Not initialized"); 1087 return &vm_sigs; 1088 } 1089 1090 void _handle_uncaught_cxx_exception() { 1091 VMError::report_and_die("An uncaught C++ exception"); 1092 } 1093 1094 1095 // First crack at OS-specific initialization, from inside the new thread. 1096 void os::initialize_thread(Thread* thr) { 1097 int r = thr_main(); 1098 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 1099 if (r) { 1100 JavaThread* jt = (JavaThread *)thr; 1101 assert(jt != NULL, "Sanity check"); 1102 size_t stack_size; 1103 address base = jt->stack_base(); 1104 if (Arguments::created_by_java_launcher()) { 1105 // Use 2MB to allow for Solaris 7 64 bit mode. 1106 stack_size = JavaThread::stack_size_at_create() == 0 1107 ? 2048*K : JavaThread::stack_size_at_create(); 1108 1109 // There are rare cases when we may have already used more than 1110 // the basic stack size allotment before this method is invoked. 1111 // Attempt to allow for a normally sized java_stack. 1112 size_t current_stack_offset = (size_t)(base - (address)&stack_size); 1113 stack_size += ReservedSpace::page_align_down(current_stack_offset); 1114 } else { 1115 // 6269555: If we were not created by a Java launcher, i.e. if we are 1116 // running embedded in a native application, treat the primordial thread 1117 // as much like a native attached thread as possible. This means using 1118 // the current stack size from thr_stksegment(), unless it is too large 1119 // to reliably setup guard pages. A reasonable max size is 8MB. 1120 size_t current_size = current_stack_size(); 1121 // This should never happen, but just in case.... 1122 if (current_size == 0) current_size = 2 * K * K; 1123 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size; 1124 } 1125 address bottom = align_up(base - stack_size, os::vm_page_size());; 1126 stack_size = (size_t)(base - bottom); 1127 1128 assert(stack_size > 0, "Stack size calculation problem"); 1129 1130 if (stack_size > jt->stack_size()) { 1131 #ifndef PRODUCT 1132 struct rlimit limits; 1133 getrlimit(RLIMIT_STACK, &limits); 1134 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur); 1135 assert(size >= jt->stack_size(), "Stack size problem in main thread"); 1136 #endif 1137 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n" 1138 "(Stack sizes are rounded up to a multiple of the system page size.)\n" 1139 "See limit(1) to increase the stack size limit.", 1140 stack_size / K, jt->stack_size() / K); 1141 vm_exit(1); 1142 } 1143 assert(jt->stack_size() >= stack_size, 1144 "Attempt to map more stack than was allocated"); 1145 jt->set_stack_size(stack_size); 1146 } 1147 1148 // With the T2 libthread (T1 is no longer supported) threads are always bound 1149 // and we use stackbanging in all cases. 1150 1151 os::Solaris::init_thread_fpu_state(); 1152 std::set_terminate(_handle_uncaught_cxx_exception); 1153 } 1154 1155 1156 1157 // Free Solaris resources related to the OSThread 1158 void os::free_thread(OSThread* osthread) { 1159 assert(osthread != NULL, "os::free_thread but osthread not set"); 1160 1161 // We are told to free resources of the argument thread, 1162 // but we can only really operate on the current thread. 1163 assert(Thread::current()->osthread() == osthread, 1164 "os::free_thread but not current thread"); 1165 1166 // Restore caller's signal mask 1167 sigset_t sigmask = osthread->caller_sigmask(); 1168 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 1169 1170 delete osthread; 1171 } 1172 1173 void os::pd_start_thread(Thread* thread) { 1174 int status = thr_continue(thread->osthread()->thread_id()); 1175 assert_status(status == 0, status, "thr_continue failed"); 1176 } 1177 1178 1179 intx os::current_thread_id() { 1180 return (intx)thr_self(); 1181 } 1182 1183 static pid_t _initial_pid = 0; 1184 1185 int os::current_process_id() { 1186 return (int)(_initial_pid ? _initial_pid : getpid()); 1187 } 1188 1189 // gethrtime() should be monotonic according to the documentation, 1190 // but some virtualized platforms are known to break this guarantee. 1191 // getTimeNanos() must be guaranteed not to move backwards, so we 1192 // are forced to add a check here. 1193 inline hrtime_t getTimeNanos() { 1194 const hrtime_t now = gethrtime(); 1195 const hrtime_t prev = max_hrtime; 1196 if (now <= prev) { 1197 return prev; // same or retrograde time; 1198 } 1199 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev); 1200 assert(obsv >= prev, "invariant"); // Monotonicity 1201 // If the CAS succeeded then we're done and return "now". 1202 // If the CAS failed and the observed value "obsv" is >= now then 1203 // we should return "obsv". If the CAS failed and now > obsv > prv then 1204 // some other thread raced this thread and installed a new value, in which case 1205 // we could either (a) retry the entire operation, (b) retry trying to install now 1206 // or (c) just return obsv. We use (c). No loop is required although in some cases 1207 // we might discard a higher "now" value in deference to a slightly lower but freshly 1208 // installed obsv value. That's entirely benign -- it admits no new orderings compared 1209 // to (a) or (b) -- and greatly reduces coherence traffic. 1210 // We might also condition (c) on the magnitude of the delta between obsv and now. 1211 // Avoiding excessive CAS operations to hot RW locations is critical. 1212 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 1213 return (prev == obsv) ? now : obsv; 1214 } 1215 1216 // Time since start-up in seconds to a fine granularity. 1217 // Used by VMSelfDestructTimer and the MemProfiler. 1218 double os::elapsedTime() { 1219 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1220 } 1221 1222 jlong os::elapsed_counter() { 1223 return (jlong)(getTimeNanos() - first_hrtime); 1224 } 1225 1226 jlong os::elapsed_frequency() { 1227 return hrtime_hz; 1228 } 1229 1230 // Return the real, user, and system times in seconds from an 1231 // arbitrary fixed point in the past. 1232 bool os::getTimesSecs(double* process_real_time, 1233 double* process_user_time, 1234 double* process_system_time) { 1235 struct tms ticks; 1236 clock_t real_ticks = times(&ticks); 1237 1238 if (real_ticks == (clock_t) (-1)) { 1239 return false; 1240 } else { 1241 double ticks_per_second = (double) clock_tics_per_sec; 1242 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1243 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1244 // For consistency return the real time from getTimeNanos() 1245 // converted to seconds. 1246 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); 1247 1248 return true; 1249 } 1250 } 1251 1252 bool os::supports_vtime() { return true; } 1253 bool os::enable_vtime() { return false; } 1254 bool os::vtime_enabled() { return false; } 1255 1256 double os::elapsedVTime() { 1257 return (double)gethrvtime() / (double)hrtime_hz; 1258 } 1259 1260 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 1261 jlong os::javaTimeMillis() { 1262 timeval t; 1263 if (gettimeofday(&t, NULL) == -1) { 1264 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno)); 1265 } 1266 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; 1267 } 1268 1269 // Must return seconds+nanos since Jan 1 1970. This must use the same 1270 // time source as javaTimeMillis and can't use get_nsec_fromepoch as 1271 // we need better than 1ms accuracy 1272 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 1273 timeval t; 1274 if (gettimeofday(&t, NULL) == -1) { 1275 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno)); 1276 } 1277 seconds = jlong(t.tv_sec); 1278 nanos = jlong(t.tv_usec) * 1000; 1279 } 1280 1281 1282 jlong os::javaTimeNanos() { 1283 return (jlong)getTimeNanos(); 1284 } 1285 1286 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1287 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits 1288 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1289 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1290 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1291 } 1292 1293 char * os::local_time_string(char *buf, size_t buflen) { 1294 struct tm t; 1295 time_t long_time; 1296 time(&long_time); 1297 localtime_r(&long_time, &t); 1298 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1299 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1300 t.tm_hour, t.tm_min, t.tm_sec); 1301 return buf; 1302 } 1303 1304 // Note: os::shutdown() might be called very early during initialization, or 1305 // called from signal handler. Before adding something to os::shutdown(), make 1306 // sure it is async-safe and can handle partially initialized VM. 1307 void os::shutdown() { 1308 1309 // allow PerfMemory to attempt cleanup of any persistent resources 1310 perfMemory_exit(); 1311 1312 // needs to remove object in file system 1313 AttachListener::abort(); 1314 1315 // flush buffered output, finish log files 1316 ostream_abort(); 1317 1318 // Check for abort hook 1319 abort_hook_t abort_hook = Arguments::abort_hook(); 1320 if (abort_hook != NULL) { 1321 abort_hook(); 1322 } 1323 } 1324 1325 // Note: os::abort() might be called very early during initialization, or 1326 // called from signal handler. Before adding something to os::abort(), make 1327 // sure it is async-safe and can handle partially initialized VM. 1328 void os::abort(bool dump_core, void* siginfo, const void* context) { 1329 os::shutdown(); 1330 if (dump_core) { 1331 #ifndef PRODUCT 1332 fdStream out(defaultStream::output_fd()); 1333 out.print_raw("Current thread is "); 1334 char buf[16]; 1335 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1336 out.print_raw_cr(buf); 1337 out.print_raw_cr("Dumping core ..."); 1338 #endif 1339 ::abort(); // dump core (for debugging) 1340 } 1341 1342 ::exit(1); 1343 } 1344 1345 // Die immediately, no exit hook, no abort hook, no cleanup. 1346 void os::die() { 1347 ::abort(); // dump core (for debugging) 1348 } 1349 1350 // DLL functions 1351 1352 const char* os::dll_file_extension() { return ".so"; } 1353 1354 // This must be hard coded because it's the system's temporary 1355 // directory not the java application's temp directory, ala java.io.tmpdir. 1356 const char* os::get_temp_directory() { return "/tmp"; } 1357 1358 static bool file_exists(const char* filename) { 1359 struct stat statbuf; 1360 if (filename == NULL || strlen(filename) == 0) { 1361 return false; 1362 } 1363 return os::stat(filename, &statbuf) == 0; 1364 } 1365 1366 bool os::dll_build_name(char* buffer, size_t buflen, 1367 const char* pname, const char* fname) { 1368 bool retval = false; 1369 const size_t pnamelen = pname ? strlen(pname) : 0; 1370 1371 // Return error on buffer overflow. 1372 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { 1373 return retval; 1374 } 1375 1376 if (pnamelen == 0) { 1377 snprintf(buffer, buflen, "lib%s.so", fname); 1378 retval = true; 1379 } else if (strchr(pname, *os::path_separator()) != NULL) { 1380 int n; 1381 char** pelements = split_path(pname, &n); 1382 if (pelements == NULL) { 1383 return false; 1384 } 1385 for (int i = 0; i < n; i++) { 1386 // really shouldn't be NULL but what the heck, check can't hurt 1387 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1388 continue; // skip the empty path values 1389 } 1390 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); 1391 if (file_exists(buffer)) { 1392 retval = true; 1393 break; 1394 } 1395 } 1396 // release the storage 1397 for (int i = 0; i < n; i++) { 1398 if (pelements[i] != NULL) { 1399 FREE_C_HEAP_ARRAY(char, pelements[i]); 1400 } 1401 } 1402 if (pelements != NULL) { 1403 FREE_C_HEAP_ARRAY(char*, pelements); 1404 } 1405 } else { 1406 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); 1407 retval = true; 1408 } 1409 return retval; 1410 } 1411 1412 // check if addr is inside libjvm.so 1413 bool os::address_is_in_vm(address addr) { 1414 static address libjvm_base_addr; 1415 Dl_info dlinfo; 1416 1417 if (libjvm_base_addr == NULL) { 1418 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1419 libjvm_base_addr = (address)dlinfo.dli_fbase; 1420 } 1421 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1422 } 1423 1424 if (dladdr((void *)addr, &dlinfo) != 0) { 1425 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1426 } 1427 1428 return false; 1429 } 1430 1431 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int); 1432 static dladdr1_func_type dladdr1_func = NULL; 1433 1434 bool os::dll_address_to_function_name(address addr, char *buf, 1435 int buflen, int * offset, 1436 bool demangle) { 1437 // buf is not optional, but offset is optional 1438 assert(buf != NULL, "sanity check"); 1439 1440 Dl_info dlinfo; 1441 1442 // dladdr1_func was initialized in os::init() 1443 if (dladdr1_func != NULL) { 1444 // yes, we have dladdr1 1445 1446 // Support for dladdr1 is checked at runtime; it may be 1447 // available even if the vm is built on a machine that does 1448 // not have dladdr1 support. Make sure there is a value for 1449 // RTLD_DL_SYMENT. 1450 #ifndef RTLD_DL_SYMENT 1451 #define RTLD_DL_SYMENT 1 1452 #endif 1453 #ifdef _LP64 1454 Elf64_Sym * info; 1455 #else 1456 Elf32_Sym * info; 1457 #endif 1458 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1459 RTLD_DL_SYMENT) != 0) { 1460 // see if we have a matching symbol that covers our address 1461 if (dlinfo.dli_saddr != NULL && 1462 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) { 1463 if (dlinfo.dli_sname != NULL) { 1464 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1465 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1466 } 1467 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1468 return true; 1469 } 1470 } 1471 // no matching symbol so try for just file info 1472 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1473 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1474 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1475 return true; 1476 } 1477 } 1478 } 1479 buf[0] = '\0'; 1480 if (offset != NULL) *offset = -1; 1481 return false; 1482 } 1483 1484 // no, only dladdr is available 1485 if (dladdr((void *)addr, &dlinfo) != 0) { 1486 // see if we have a matching symbol 1487 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1488 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1489 jio_snprintf(buf, buflen, dlinfo.dli_sname); 1490 } 1491 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1492 return true; 1493 } 1494 // no matching symbol so try for just file info 1495 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1496 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1497 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1498 return true; 1499 } 1500 } 1501 } 1502 buf[0] = '\0'; 1503 if (offset != NULL) *offset = -1; 1504 return false; 1505 } 1506 1507 bool os::dll_address_to_library_name(address addr, char* buf, 1508 int buflen, int* offset) { 1509 // buf is not optional, but offset is optional 1510 assert(buf != NULL, "sanity check"); 1511 1512 Dl_info dlinfo; 1513 1514 if (dladdr((void*)addr, &dlinfo) != 0) { 1515 if (dlinfo.dli_fname != NULL) { 1516 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1517 } 1518 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1519 *offset = addr - (address)dlinfo.dli_fbase; 1520 } 1521 return true; 1522 } 1523 1524 buf[0] = '\0'; 1525 if (offset) *offset = -1; 1526 return false; 1527 } 1528 1529 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1530 Dl_info dli; 1531 // Sanity check? 1532 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 || 1533 dli.dli_fname == NULL) { 1534 return 1; 1535 } 1536 1537 void * handle = dlopen(dli.dli_fname, RTLD_LAZY); 1538 if (handle == NULL) { 1539 return 1; 1540 } 1541 1542 Link_map *map; 1543 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1544 if (map == NULL) { 1545 dlclose(handle); 1546 return 1; 1547 } 1548 1549 while (map->l_prev != NULL) { 1550 map = map->l_prev; 1551 } 1552 1553 while (map != NULL) { 1554 // Iterate through all map entries and call callback with fields of interest 1555 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1556 dlclose(handle); 1557 return 1; 1558 } 1559 map = map->l_next; 1560 } 1561 1562 dlclose(handle); 1563 return 0; 1564 } 1565 1566 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1567 outputStream * out = (outputStream *) param; 1568 out->print_cr(PTR_FORMAT " \t%s", base_address, name); 1569 return 0; 1570 } 1571 1572 void os::print_dll_info(outputStream * st) { 1573 st->print_cr("Dynamic libraries:"); st->flush(); 1574 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1575 st->print_cr("Error: Cannot print dynamic libraries."); 1576 } 1577 } 1578 1579 // Loads .dll/.so and 1580 // in case of error it checks if .dll/.so was built for the 1581 // same architecture as Hotspot is running on 1582 1583 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1584 void * result= ::dlopen(filename, RTLD_LAZY); 1585 if (result != NULL) { 1586 // Successful loading 1587 return result; 1588 } 1589 1590 Elf32_Ehdr elf_head; 1591 1592 // Read system error message into ebuf 1593 // It may or may not be overwritten below 1594 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1595 ebuf[ebuflen-1]='\0'; 1596 int diag_msg_max_length=ebuflen-strlen(ebuf); 1597 char* diag_msg_buf=ebuf+strlen(ebuf); 1598 1599 if (diag_msg_max_length==0) { 1600 // No more space in ebuf for additional diagnostics message 1601 return NULL; 1602 } 1603 1604 1605 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1606 1607 if (file_descriptor < 0) { 1608 // Can't open library, report dlerror() message 1609 return NULL; 1610 } 1611 1612 bool failed_to_read_elf_head= 1613 (sizeof(elf_head)!= 1614 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1615 1616 ::close(file_descriptor); 1617 if (failed_to_read_elf_head) { 1618 // file i/o error - report dlerror() msg 1619 return NULL; 1620 } 1621 1622 typedef struct { 1623 Elf32_Half code; // Actual value as defined in elf.h 1624 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1625 char elf_class; // 32 or 64 bit 1626 char endianess; // MSB or LSB 1627 char* name; // String representation 1628 } arch_t; 1629 1630 static const arch_t arch_array[]={ 1631 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1632 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1633 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1634 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1635 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1636 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1637 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1638 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1639 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1640 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"} 1641 }; 1642 1643 #if (defined IA32) 1644 static Elf32_Half running_arch_code=EM_386; 1645 #elif (defined AMD64) 1646 static Elf32_Half running_arch_code=EM_X86_64; 1647 #elif (defined IA64) 1648 static Elf32_Half running_arch_code=EM_IA_64; 1649 #elif (defined __sparc) && (defined _LP64) 1650 static Elf32_Half running_arch_code=EM_SPARCV9; 1651 #elif (defined __sparc) && (!defined _LP64) 1652 static Elf32_Half running_arch_code=EM_SPARC; 1653 #elif (defined __powerpc64__) 1654 static Elf32_Half running_arch_code=EM_PPC64; 1655 #elif (defined __powerpc__) 1656 static Elf32_Half running_arch_code=EM_PPC; 1657 #elif (defined ARM) 1658 static Elf32_Half running_arch_code=EM_ARM; 1659 #else 1660 #error Method os::dll_load requires that one of following is defined:\ 1661 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM 1662 #endif 1663 1664 // Identify compatability class for VM's architecture and library's architecture 1665 // Obtain string descriptions for architectures 1666 1667 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1668 int running_arch_index=-1; 1669 1670 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1671 if (running_arch_code == arch_array[i].code) { 1672 running_arch_index = i; 1673 } 1674 if (lib_arch.code == arch_array[i].code) { 1675 lib_arch.compat_class = arch_array[i].compat_class; 1676 lib_arch.name = arch_array[i].name; 1677 } 1678 } 1679 1680 assert(running_arch_index != -1, 1681 "Didn't find running architecture code (running_arch_code) in arch_array"); 1682 if (running_arch_index == -1) { 1683 // Even though running architecture detection failed 1684 // we may still continue with reporting dlerror() message 1685 return NULL; 1686 } 1687 1688 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1689 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1690 return NULL; 1691 } 1692 1693 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1694 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1695 return NULL; 1696 } 1697 1698 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1699 if (lib_arch.name!=NULL) { 1700 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1701 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1702 lib_arch.name, arch_array[running_arch_index].name); 1703 } else { 1704 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1705 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1706 lib_arch.code, 1707 arch_array[running_arch_index].name); 1708 } 1709 } 1710 1711 return NULL; 1712 } 1713 1714 void* os::dll_lookup(void* handle, const char* name) { 1715 return dlsym(handle, name); 1716 } 1717 1718 void* os::get_default_process_handle() { 1719 return (void*)::dlopen(NULL, RTLD_LAZY); 1720 } 1721 1722 int os::stat(const char *path, struct stat *sbuf) { 1723 char pathbuf[MAX_PATH]; 1724 if (strlen(path) > MAX_PATH - 1) { 1725 errno = ENAMETOOLONG; 1726 return -1; 1727 } 1728 os::native_path(strcpy(pathbuf, path)); 1729 return ::stat(pathbuf, sbuf); 1730 } 1731 1732 static inline time_t get_mtime(const char* filename) { 1733 struct stat st; 1734 int ret = os::stat(filename, &st); 1735 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 1736 return st.st_mtime; 1737 } 1738 1739 int os::compare_file_modified_times(const char* file1, const char* file2) { 1740 time_t t1 = get_mtime(file1); 1741 time_t t2 = get_mtime(file2); 1742 return t1 - t2; 1743 } 1744 1745 static bool _print_ascii_file(const char* filename, outputStream* st) { 1746 int fd = ::open(filename, O_RDONLY); 1747 if (fd == -1) { 1748 return false; 1749 } 1750 1751 char buf[32]; 1752 int bytes; 1753 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1754 st->print_raw(buf, bytes); 1755 } 1756 1757 ::close(fd); 1758 1759 return true; 1760 } 1761 1762 void os::print_os_info_brief(outputStream* st) { 1763 os::Solaris::print_distro_info(st); 1764 1765 os::Posix::print_uname_info(st); 1766 1767 os::Solaris::print_libversion_info(st); 1768 } 1769 1770 void os::print_os_info(outputStream* st) { 1771 st->print("OS:"); 1772 1773 os::Solaris::print_distro_info(st); 1774 1775 os::Posix::print_uname_info(st); 1776 1777 os::Solaris::print_libversion_info(st); 1778 1779 os::Posix::print_rlimit_info(st); 1780 1781 os::Posix::print_load_average(st); 1782 } 1783 1784 void os::Solaris::print_distro_info(outputStream* st) { 1785 if (!_print_ascii_file("/etc/release", st)) { 1786 st->print("Solaris"); 1787 } 1788 st->cr(); 1789 } 1790 1791 void os::get_summary_os_info(char* buf, size_t buflen) { 1792 strncpy(buf, "Solaris", buflen); // default to plain solaris 1793 FILE* fp = fopen("/etc/release", "r"); 1794 if (fp != NULL) { 1795 char tmp[256]; 1796 // Only get the first line and chop out everything but the os name. 1797 if (fgets(tmp, sizeof(tmp), fp)) { 1798 char* ptr = tmp; 1799 // skip past whitespace characters 1800 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++; 1801 if (*ptr != '\0') { 1802 char* nl = strchr(ptr, '\n'); 1803 if (nl != NULL) *nl = '\0'; 1804 strncpy(buf, ptr, buflen); 1805 } 1806 } 1807 fclose(fp); 1808 } 1809 } 1810 1811 void os::Solaris::print_libversion_info(outputStream* st) { 1812 st->print(" (T2 libthread)"); 1813 st->cr(); 1814 } 1815 1816 static bool check_addr0(outputStream* st) { 1817 jboolean status = false; 1818 const int read_chunk = 200; 1819 int ret = 0; 1820 int nmap = 0; 1821 int fd = ::open("/proc/self/map",O_RDONLY); 1822 if (fd >= 0) { 1823 prmap_t *p = NULL; 1824 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t)); 1825 if (NULL == mbuff) { 1826 ::close(fd); 1827 return status; 1828 } 1829 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) { 1830 //check if read() has not read partial data 1831 if( 0 != ret % sizeof(prmap_t)){ 1832 break; 1833 } 1834 nmap = ret / sizeof(prmap_t); 1835 p = (prmap_t *)mbuff; 1836 for(int i = 0; i < nmap; i++){ 1837 if (p->pr_vaddr == 0x0) { 1838 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024); 1839 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname); 1840 st->print("Access: "); 1841 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-"); 1842 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-"); 1843 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-"); 1844 st->cr(); 1845 status = true; 1846 } 1847 p++; 1848 } 1849 } 1850 free(mbuff); 1851 ::close(fd); 1852 } 1853 return status; 1854 } 1855 1856 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1857 // Get MHz with system call. We don't seem to already have this. 1858 processor_info_t stats; 1859 processorid_t id = getcpuid(); 1860 int clock = 0; 1861 if (processor_info(id, &stats) != -1) { 1862 clock = stats.pi_clock; // pi_processor_type isn't more informative than below 1863 } 1864 #ifdef AMD64 1865 snprintf(buf, buflen, "x86 64 bit %d MHz", clock); 1866 #else 1867 // must be sparc 1868 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock); 1869 #endif 1870 } 1871 1872 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1873 // Nothing to do for now. 1874 } 1875 1876 void os::print_memory_info(outputStream* st) { 1877 st->print("Memory:"); 1878 st->print(" %dk page", os::vm_page_size()>>10); 1879 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 1880 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 1881 st->cr(); 1882 (void) check_addr0(st); 1883 } 1884 1885 // Moved from whole group, because we need them here for diagnostic 1886 // prints. 1887 static int Maxsignum = 0; 1888 static int *ourSigFlags = NULL; 1889 1890 int os::Solaris::get_our_sigflags(int sig) { 1891 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1892 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1893 return ourSigFlags[sig]; 1894 } 1895 1896 void os::Solaris::set_our_sigflags(int sig, int flags) { 1897 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1898 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1899 ourSigFlags[sig] = flags; 1900 } 1901 1902 1903 static const char* get_signal_handler_name(address handler, 1904 char* buf, int buflen) { 1905 int offset; 1906 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 1907 if (found) { 1908 // skip directory names 1909 const char *p1, *p2; 1910 p1 = buf; 1911 size_t len = strlen(os::file_separator()); 1912 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 1913 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 1914 } else { 1915 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 1916 } 1917 return buf; 1918 } 1919 1920 static void print_signal_handler(outputStream* st, int sig, 1921 char* buf, size_t buflen) { 1922 struct sigaction sa; 1923 1924 sigaction(sig, NULL, &sa); 1925 1926 st->print("%s: ", os::exception_name(sig, buf, buflen)); 1927 1928 address handler = (sa.sa_flags & SA_SIGINFO) 1929 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 1930 : CAST_FROM_FN_PTR(address, sa.sa_handler); 1931 1932 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 1933 st->print("SIG_DFL"); 1934 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 1935 st->print("SIG_IGN"); 1936 } else { 1937 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 1938 } 1939 1940 st->print(", sa_mask[0]="); 1941 os::Posix::print_signal_set_short(st, &sa.sa_mask); 1942 1943 address rh = VMError::get_resetted_sighandler(sig); 1944 // May be, handler was resetted by VMError? 1945 if (rh != NULL) { 1946 handler = rh; 1947 sa.sa_flags = VMError::get_resetted_sigflags(sig); 1948 } 1949 1950 st->print(", sa_flags="); 1951 os::Posix::print_sa_flags(st, sa.sa_flags); 1952 1953 // Check: is it our handler? 1954 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) { 1955 // It is our signal handler 1956 // check for flags 1957 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 1958 st->print( 1959 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 1960 os::Solaris::get_our_sigflags(sig)); 1961 } 1962 } 1963 st->cr(); 1964 } 1965 1966 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1967 st->print_cr("Signal Handlers:"); 1968 print_signal_handler(st, SIGSEGV, buf, buflen); 1969 print_signal_handler(st, SIGBUS , buf, buflen); 1970 print_signal_handler(st, SIGFPE , buf, buflen); 1971 print_signal_handler(st, SIGPIPE, buf, buflen); 1972 print_signal_handler(st, SIGXFSZ, buf, buflen); 1973 print_signal_handler(st, SIGILL , buf, buflen); 1974 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 1975 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1976 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 1977 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1978 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 1979 } 1980 1981 static char saved_jvm_path[MAXPATHLEN] = { 0 }; 1982 1983 // Find the full path to the current module, libjvm.so 1984 void os::jvm_path(char *buf, jint buflen) { 1985 // Error checking. 1986 if (buflen < MAXPATHLEN) { 1987 assert(false, "must use a large-enough buffer"); 1988 buf[0] = '\0'; 1989 return; 1990 } 1991 // Lazy resolve the path to current module. 1992 if (saved_jvm_path[0] != 0) { 1993 strcpy(buf, saved_jvm_path); 1994 return; 1995 } 1996 1997 Dl_info dlinfo; 1998 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 1999 assert(ret != 0, "cannot locate libjvm"); 2000 if (ret != 0 && dlinfo.dli_fname != NULL) { 2001 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) { 2002 return; 2003 } 2004 } else { 2005 buf[0] = '\0'; 2006 return; 2007 } 2008 2009 if (Arguments::sun_java_launcher_is_altjvm()) { 2010 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 2011 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". 2012 // If "/jre/lib/" appears at the right place in the string, then 2013 // assume we are installed in a JDK and we're done. Otherwise, check 2014 // for a JAVA_HOME environment variable and fix up the path so it 2015 // looks like libjvm.so is installed there (append a fake suffix 2016 // hotspot/libjvm.so). 2017 const char *p = buf + strlen(buf) - 1; 2018 for (int count = 0; p > buf && count < 5; ++count) { 2019 for (--p; p > buf && *p != '/'; --p) 2020 /* empty */ ; 2021 } 2022 2023 if (strncmp(p, "/jre/lib/", 9) != 0) { 2024 // Look for JAVA_HOME in the environment. 2025 char* java_home_var = ::getenv("JAVA_HOME"); 2026 if (java_home_var != NULL && java_home_var[0] != 0) { 2027 char* jrelib_p; 2028 int len; 2029 2030 // Check the current module name "libjvm.so". 2031 p = strrchr(buf, '/'); 2032 assert(strstr(p, "/libjvm") == p, "invalid library name"); 2033 2034 if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) { 2035 return; 2036 } 2037 // determine if this is a legacy image or modules image 2038 // modules image doesn't have "jre" subdirectory 2039 len = strlen(buf); 2040 assert(len < buflen, "Ran out of buffer space"); 2041 jrelib_p = buf + len; 2042 snprintf(jrelib_p, buflen-len, "/jre/lib"); 2043 if (0 != access(buf, F_OK)) { 2044 snprintf(jrelib_p, buflen-len, "/lib"); 2045 } 2046 2047 if (0 == access(buf, F_OK)) { 2048 // Use current module name "libjvm.so" 2049 len = strlen(buf); 2050 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 2051 } else { 2052 // Go back to path of .so 2053 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) { 2054 return; 2055 } 2056 } 2057 } 2058 } 2059 } 2060 2061 strncpy(saved_jvm_path, buf, MAXPATHLEN); 2062 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 2063 } 2064 2065 2066 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2067 // no prefix required, not even "_" 2068 } 2069 2070 2071 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2072 // no suffix required 2073 } 2074 2075 // This method is a copy of JDK's sysGetLastErrorString 2076 // from src/solaris/hpi/src/system_md.c 2077 2078 size_t os::lasterror(char *buf, size_t len) { 2079 if (errno == 0) return 0; 2080 2081 const char *s = os::strerror(errno); 2082 size_t n = ::strlen(s); 2083 if (n >= len) { 2084 n = len - 1; 2085 } 2086 ::strncpy(buf, s, n); 2087 buf[n] = '\0'; 2088 return n; 2089 } 2090 2091 2092 // sun.misc.Signal 2093 2094 extern "C" { 2095 static void UserHandler(int sig, void *siginfo, void *context) { 2096 // Ctrl-C is pressed during error reporting, likely because the error 2097 // handler fails to abort. Let VM die immediately. 2098 if (sig == SIGINT && is_error_reported()) { 2099 os::die(); 2100 } 2101 2102 os::signal_notify(sig); 2103 // We do not need to reinstate the signal handler each time... 2104 } 2105 } 2106 2107 void* os::user_handler() { 2108 return CAST_FROM_FN_PTR(void*, UserHandler); 2109 } 2110 2111 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) { 2112 struct timespec ts; 2113 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 2114 2115 return ts; 2116 } 2117 2118 extern "C" { 2119 typedef void (*sa_handler_t)(int); 2120 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2121 } 2122 2123 void* os::signal(int signal_number, void* handler) { 2124 struct sigaction sigAct, oldSigAct; 2125 sigfillset(&(sigAct.sa_mask)); 2126 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 2127 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2128 2129 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 2130 // -1 means registration failed 2131 return (void *)-1; 2132 } 2133 2134 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2135 } 2136 2137 void os::signal_raise(int signal_number) { 2138 raise(signal_number); 2139 } 2140 2141 // The following code is moved from os.cpp for making this 2142 // code platform specific, which it is by its very nature. 2143 2144 // a counter for each possible signal value 2145 static int Sigexit = 0; 2146 static jint *pending_signals = NULL; 2147 static int *preinstalled_sigs = NULL; 2148 static struct sigaction *chainedsigactions = NULL; 2149 static sema_t sig_sem; 2150 typedef int (*version_getting_t)(); 2151 version_getting_t os::Solaris::get_libjsig_version = NULL; 2152 2153 int os::sigexitnum_pd() { 2154 assert(Sigexit > 0, "signal memory not yet initialized"); 2155 return Sigexit; 2156 } 2157 2158 void os::Solaris::init_signal_mem() { 2159 // Initialize signal structures 2160 Maxsignum = SIGRTMAX; 2161 Sigexit = Maxsignum+1; 2162 assert(Maxsignum >0, "Unable to obtain max signal number"); 2163 2164 // pending_signals has one int per signal 2165 // The additional signal is for SIGEXIT - exit signal to signal_thread 2166 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); 2167 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 2168 2169 if (UseSignalChaining) { 2170 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 2171 * (Maxsignum + 1), mtInternal); 2172 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 2173 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2174 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 2175 } 2176 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2177 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 2178 } 2179 2180 void os::signal_init_pd() { 2181 int ret; 2182 2183 ret = ::sema_init(&sig_sem, 0, NULL, NULL); 2184 assert(ret == 0, "sema_init() failed"); 2185 } 2186 2187 void os::signal_notify(int signal_number) { 2188 int ret; 2189 2190 Atomic::inc(&pending_signals[signal_number]); 2191 ret = ::sema_post(&sig_sem); 2192 assert(ret == 0, "sema_post() failed"); 2193 } 2194 2195 static int check_pending_signals(bool wait_for_signal) { 2196 int ret; 2197 while (true) { 2198 for (int i = 0; i < Sigexit + 1; i++) { 2199 jint n = pending_signals[i]; 2200 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2201 return i; 2202 } 2203 } 2204 if (!wait_for_signal) { 2205 return -1; 2206 } 2207 JavaThread *thread = JavaThread::current(); 2208 ThreadBlockInVM tbivm(thread); 2209 2210 bool threadIsSuspended; 2211 do { 2212 thread->set_suspend_equivalent(); 2213 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2214 while ((ret = ::sema_wait(&sig_sem)) == EINTR) 2215 ; 2216 assert(ret == 0, "sema_wait() failed"); 2217 2218 // were we externally suspended while we were waiting? 2219 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2220 if (threadIsSuspended) { 2221 // The semaphore has been incremented, but while we were waiting 2222 // another thread suspended us. We don't want to continue running 2223 // while suspended because that would surprise the thread that 2224 // suspended us. 2225 ret = ::sema_post(&sig_sem); 2226 assert(ret == 0, "sema_post() failed"); 2227 2228 thread->java_suspend_self(); 2229 } 2230 } while (threadIsSuspended); 2231 } 2232 } 2233 2234 int os::signal_lookup() { 2235 return check_pending_signals(false); 2236 } 2237 2238 int os::signal_wait() { 2239 return check_pending_signals(true); 2240 } 2241 2242 //////////////////////////////////////////////////////////////////////////////// 2243 // Virtual Memory 2244 2245 static int page_size = -1; 2246 2247 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will 2248 // clear this var if support is not available. 2249 static bool has_map_align = true; 2250 2251 int os::vm_page_size() { 2252 assert(page_size != -1, "must call os::init"); 2253 return page_size; 2254 } 2255 2256 // Solaris allocates memory by pages. 2257 int os::vm_allocation_granularity() { 2258 assert(page_size != -1, "must call os::init"); 2259 return page_size; 2260 } 2261 2262 static bool recoverable_mmap_error(int err) { 2263 // See if the error is one we can let the caller handle. This 2264 // list of errno values comes from the Solaris mmap(2) man page. 2265 switch (err) { 2266 case EBADF: 2267 case EINVAL: 2268 case ENOTSUP: 2269 // let the caller deal with these errors 2270 return true; 2271 2272 default: 2273 // Any remaining errors on this OS can cause our reserved mapping 2274 // to be lost. That can cause confusion where different data 2275 // structures think they have the same memory mapped. The worst 2276 // scenario is if both the VM and a library think they have the 2277 // same memory mapped. 2278 return false; 2279 } 2280 } 2281 2282 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec, 2283 int err) { 2284 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2285 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec, 2286 os::strerror(err), err); 2287 } 2288 2289 static void warn_fail_commit_memory(char* addr, size_t bytes, 2290 size_t alignment_hint, bool exec, 2291 int err) { 2292 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2293 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes, 2294 alignment_hint, exec, os::strerror(err), err); 2295 } 2296 2297 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) { 2298 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2299 size_t size = bytes; 2300 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2301 if (res != NULL) { 2302 if (UseNUMAInterleaving) { 2303 numa_make_global(addr, bytes); 2304 } 2305 return 0; 2306 } 2307 2308 int err = errno; // save errno from mmap() call in mmap_chunk() 2309 2310 if (!recoverable_mmap_error(err)) { 2311 warn_fail_commit_memory(addr, bytes, exec, err); 2312 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory."); 2313 } 2314 2315 return err; 2316 } 2317 2318 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 2319 return Solaris::commit_memory_impl(addr, bytes, exec) == 0; 2320 } 2321 2322 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec, 2323 const char* mesg) { 2324 assert(mesg != NULL, "mesg must be specified"); 2325 int err = os::Solaris::commit_memory_impl(addr, bytes, exec); 2326 if (err != 0) { 2327 // the caller wants all commit errors to exit with the specified mesg: 2328 warn_fail_commit_memory(addr, bytes, exec, err); 2329 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2330 } 2331 } 2332 2333 size_t os::Solaris::page_size_for_alignment(size_t alignment) { 2334 assert(is_aligned(alignment, (size_t) vm_page_size()), 2335 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, 2336 alignment, (size_t) vm_page_size()); 2337 2338 for (int i = 0; _page_sizes[i] != 0; i++) { 2339 if (is_aligned(alignment, _page_sizes[i])) { 2340 return _page_sizes[i]; 2341 } 2342 } 2343 2344 return (size_t) vm_page_size(); 2345 } 2346 2347 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, 2348 size_t alignment_hint, bool exec) { 2349 int err = Solaris::commit_memory_impl(addr, bytes, exec); 2350 if (err == 0 && UseLargePages && alignment_hint > 0) { 2351 assert(is_aligned(bytes, alignment_hint), 2352 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint); 2353 2354 // The syscall memcntl requires an exact page size (see man memcntl for details). 2355 size_t page_size = page_size_for_alignment(alignment_hint); 2356 if (page_size > (size_t) vm_page_size()) { 2357 (void)Solaris::setup_large_pages(addr, bytes, page_size); 2358 } 2359 } 2360 return err; 2361 } 2362 2363 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2364 bool exec) { 2365 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0; 2366 } 2367 2368 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, 2369 size_t alignment_hint, bool exec, 2370 const char* mesg) { 2371 assert(mesg != NULL, "mesg must be specified"); 2372 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec); 2373 if (err != 0) { 2374 // the caller wants all commit errors to exit with the specified mesg: 2375 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err); 2376 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2377 } 2378 } 2379 2380 // Uncommit the pages in a specified region. 2381 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { 2382 if (madvise(addr, bytes, MADV_FREE) < 0) { 2383 debug_only(warning("MADV_FREE failed.")); 2384 return; 2385 } 2386 } 2387 2388 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2389 return os::commit_memory(addr, size, !ExecMem); 2390 } 2391 2392 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2393 return os::uncommit_memory(addr, size); 2394 } 2395 2396 // Change the page size in a given range. 2397 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2398 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2399 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2400 if (UseLargePages) { 2401 size_t page_size = Solaris::page_size_for_alignment(alignment_hint); 2402 if (page_size > (size_t) vm_page_size()) { 2403 Solaris::setup_large_pages(addr, bytes, page_size); 2404 } 2405 } 2406 } 2407 2408 // Tell the OS to make the range local to the first-touching LWP 2409 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2410 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2411 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2412 debug_only(warning("MADV_ACCESS_LWP failed.")); 2413 } 2414 } 2415 2416 // Tell the OS that this range would be accessed from different LWPs. 2417 void os::numa_make_global(char *addr, size_t bytes) { 2418 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2419 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2420 debug_only(warning("MADV_ACCESS_MANY failed.")); 2421 } 2422 } 2423 2424 // Get the number of the locality groups. 2425 size_t os::numa_get_groups_num() { 2426 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2427 return n != -1 ? n : 1; 2428 } 2429 2430 // Get a list of leaf locality groups. A leaf lgroup is group that 2431 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2432 // board. An LWP is assigned to one of these groups upon creation. 2433 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2434 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2435 ids[0] = 0; 2436 return 1; 2437 } 2438 int result_size = 0, top = 1, bottom = 0, cur = 0; 2439 for (int k = 0; k < size; k++) { 2440 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2441 (Solaris::lgrp_id_t*)&ids[top], size - top); 2442 if (r == -1) { 2443 ids[0] = 0; 2444 return 1; 2445 } 2446 if (!r) { 2447 // That's a leaf node. 2448 assert(bottom <= cur, "Sanity check"); 2449 // Check if the node has memory 2450 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2451 NULL, 0, LGRP_RSRC_MEM) > 0) { 2452 ids[bottom++] = ids[cur]; 2453 } 2454 } 2455 top += r; 2456 cur++; 2457 } 2458 if (bottom == 0) { 2459 // Handle a situation, when the OS reports no memory available. 2460 // Assume UMA architecture. 2461 ids[0] = 0; 2462 return 1; 2463 } 2464 return bottom; 2465 } 2466 2467 // Detect the topology change. Typically happens during CPU plugging-unplugging. 2468 bool os::numa_topology_changed() { 2469 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2470 if (is_stale != -1 && is_stale) { 2471 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2472 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2473 assert(c != 0, "Failure to initialize LGRP API"); 2474 Solaris::set_lgrp_cookie(c); 2475 return true; 2476 } 2477 return false; 2478 } 2479 2480 // Get the group id of the current LWP. 2481 int os::numa_get_group_id() { 2482 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2483 if (lgrp_id == -1) { 2484 return 0; 2485 } 2486 const int size = os::numa_get_groups_num(); 2487 int *ids = (int*)alloca(size * sizeof(int)); 2488 2489 // Get the ids of all lgroups with memory; r is the count. 2490 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2491 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2492 if (r <= 0) { 2493 return 0; 2494 } 2495 return ids[os::random() % r]; 2496 } 2497 2498 // Request information about the page. 2499 bool os::get_page_info(char *start, page_info* info) { 2500 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2501 uint64_t addr = (uintptr_t)start; 2502 uint64_t outdata[2]; 2503 uint_t validity = 0; 2504 2505 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2506 return false; 2507 } 2508 2509 info->size = 0; 2510 info->lgrp_id = -1; 2511 2512 if ((validity & 1) != 0) { 2513 if ((validity & 2) != 0) { 2514 info->lgrp_id = outdata[0]; 2515 } 2516 if ((validity & 4) != 0) { 2517 info->size = outdata[1]; 2518 } 2519 return true; 2520 } 2521 return false; 2522 } 2523 2524 // Scan the pages from start to end until a page different than 2525 // the one described in the info parameter is encountered. 2526 char *os::scan_pages(char *start, char* end, page_info* page_expected, 2527 page_info* page_found) { 2528 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2529 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2530 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1]; 2531 uint_t validity[MAX_MEMINFO_CNT]; 2532 2533 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2534 uint64_t p = (uint64_t)start; 2535 while (p < (uint64_t)end) { 2536 addrs[0] = p; 2537 size_t addrs_count = 1; 2538 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { 2539 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2540 addrs_count++; 2541 } 2542 2543 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2544 return NULL; 2545 } 2546 2547 size_t i = 0; 2548 for (; i < addrs_count; i++) { 2549 if ((validity[i] & 1) != 0) { 2550 if ((validity[i] & 4) != 0) { 2551 if (outdata[types * i + 1] != page_expected->size) { 2552 break; 2553 } 2554 } else if (page_expected->size != 0) { 2555 break; 2556 } 2557 2558 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2559 if (outdata[types * i] != page_expected->lgrp_id) { 2560 break; 2561 } 2562 } 2563 } else { 2564 return NULL; 2565 } 2566 } 2567 2568 if (i < addrs_count) { 2569 if ((validity[i] & 2) != 0) { 2570 page_found->lgrp_id = outdata[types * i]; 2571 } else { 2572 page_found->lgrp_id = -1; 2573 } 2574 if ((validity[i] & 4) != 0) { 2575 page_found->size = outdata[types * i + 1]; 2576 } else { 2577 page_found->size = 0; 2578 } 2579 return (char*)addrs[i]; 2580 } 2581 2582 p = addrs[addrs_count - 1] + page_size; 2583 } 2584 return end; 2585 } 2586 2587 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 2588 size_t size = bytes; 2589 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2590 // uncommitted page. Otherwise, the read/write might succeed if we 2591 // have enough swap space to back the physical page. 2592 return 2593 NULL != Solaris::mmap_chunk(addr, size, 2594 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2595 PROT_NONE); 2596 } 2597 2598 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2599 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2600 2601 if (b == MAP_FAILED) { 2602 return NULL; 2603 } 2604 return b; 2605 } 2606 2607 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, 2608 size_t alignment_hint, bool fixed) { 2609 char* addr = requested_addr; 2610 int flags = MAP_PRIVATE | MAP_NORESERVE; 2611 2612 assert(!(fixed && (alignment_hint > 0)), 2613 "alignment hint meaningless with fixed mmap"); 2614 2615 if (fixed) { 2616 flags |= MAP_FIXED; 2617 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) { 2618 flags |= MAP_ALIGN; 2619 addr = (char*) alignment_hint; 2620 } 2621 2622 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2623 // uncommitted page. Otherwise, the read/write might succeed if we 2624 // have enough swap space to back the physical page. 2625 return mmap_chunk(addr, bytes, flags, PROT_NONE); 2626 } 2627 2628 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2629 size_t alignment_hint) { 2630 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, 2631 (requested_addr != NULL)); 2632 2633 guarantee(requested_addr == NULL || requested_addr == addr, 2634 "OS failed to return requested mmap address."); 2635 return addr; 2636 } 2637 2638 // Reserve memory at an arbitrary address, only if that area is 2639 // available (and not reserved for something else). 2640 2641 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2642 const int max_tries = 10; 2643 char* base[max_tries]; 2644 size_t size[max_tries]; 2645 2646 // Solaris adds a gap between mmap'ed regions. The size of the gap 2647 // is dependent on the requested size and the MMU. Our initial gap 2648 // value here is just a guess and will be corrected later. 2649 bool had_top_overlap = false; 2650 bool have_adjusted_gap = false; 2651 size_t gap = 0x400000; 2652 2653 // Assert only that the size is a multiple of the page size, since 2654 // that's all that mmap requires, and since that's all we really know 2655 // about at this low abstraction level. If we need higher alignment, 2656 // we can either pass an alignment to this method or verify alignment 2657 // in one of the methods further up the call chain. See bug 5044738. 2658 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2659 2660 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 2661 // Give it a try, if the kernel honors the hint we can return immediately. 2662 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 2663 2664 volatile int err = errno; 2665 if (addr == requested_addr) { 2666 return addr; 2667 } else if (addr != NULL) { 2668 pd_unmap_memory(addr, bytes); 2669 } 2670 2671 if (log_is_enabled(Warning, os)) { 2672 char buf[256]; 2673 buf[0] = '\0'; 2674 if (addr == NULL) { 2675 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err)); 2676 } 2677 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at " 2678 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT 2679 "%s", bytes, requested_addr, addr, buf); 2680 } 2681 2682 // Address hint method didn't work. Fall back to the old method. 2683 // In theory, once SNV becomes our oldest supported platform, this 2684 // code will no longer be needed. 2685 // 2686 // Repeatedly allocate blocks until the block is allocated at the 2687 // right spot. Give up after max_tries. 2688 int i; 2689 for (i = 0; i < max_tries; ++i) { 2690 base[i] = reserve_memory(bytes); 2691 2692 if (base[i] != NULL) { 2693 // Is this the block we wanted? 2694 if (base[i] == requested_addr) { 2695 size[i] = bytes; 2696 break; 2697 } 2698 2699 // check that the gap value is right 2700 if (had_top_overlap && !have_adjusted_gap) { 2701 size_t actual_gap = base[i-1] - base[i] - bytes; 2702 if (gap != actual_gap) { 2703 // adjust the gap value and retry the last 2 allocations 2704 assert(i > 0, "gap adjustment code problem"); 2705 have_adjusted_gap = true; // adjust the gap only once, just in case 2706 gap = actual_gap; 2707 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap); 2708 unmap_memory(base[i], bytes); 2709 unmap_memory(base[i-1], size[i-1]); 2710 i-=2; 2711 continue; 2712 } 2713 } 2714 2715 // Does this overlap the block we wanted? Give back the overlapped 2716 // parts and try again. 2717 // 2718 // There is still a bug in this code: if top_overlap == bytes, 2719 // the overlap is offset from requested region by the value of gap. 2720 // In this case giving back the overlapped part will not work, 2721 // because we'll give back the entire block at base[i] and 2722 // therefore the subsequent allocation will not generate a new gap. 2723 // This could be fixed with a new algorithm that used larger 2724 // or variable size chunks to find the requested region - 2725 // but such a change would introduce additional complications. 2726 // It's rare enough that the planets align for this bug, 2727 // so we'll just wait for a fix for 6204603/5003415 which 2728 // will provide a mmap flag to allow us to avoid this business. 2729 2730 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2731 if (top_overlap >= 0 && top_overlap < bytes) { 2732 had_top_overlap = true; 2733 unmap_memory(base[i], top_overlap); 2734 base[i] += top_overlap; 2735 size[i] = bytes - top_overlap; 2736 } else { 2737 size_t bottom_overlap = base[i] + bytes - requested_addr; 2738 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2739 if (bottom_overlap == 0) { 2740 log_info(os)("attempt_reserve_memory_at: possible alignment bug"); 2741 } 2742 unmap_memory(requested_addr, bottom_overlap); 2743 size[i] = bytes - bottom_overlap; 2744 } else { 2745 size[i] = bytes; 2746 } 2747 } 2748 } 2749 } 2750 2751 // Give back the unused reserved pieces. 2752 2753 for (int j = 0; j < i; ++j) { 2754 if (base[j] != NULL) { 2755 unmap_memory(base[j], size[j]); 2756 } 2757 } 2758 2759 return (i < max_tries) ? requested_addr : NULL; 2760 } 2761 2762 bool os::pd_release_memory(char* addr, size_t bytes) { 2763 size_t size = bytes; 2764 return munmap(addr, size) == 0; 2765 } 2766 2767 static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 2768 assert(addr == (char*)align_down((uintptr_t)addr, os::vm_page_size()), 2769 "addr must be page aligned"); 2770 int retVal = mprotect(addr, bytes, prot); 2771 return retVal == 0; 2772 } 2773 2774 // Protect memory (Used to pass readonly pages through 2775 // JNI GetArray<type>Elements with empty arrays.) 2776 // Also, used for serialization page and for compressed oops null pointer 2777 // checking. 2778 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2779 bool is_committed) { 2780 unsigned int p = 0; 2781 switch (prot) { 2782 case MEM_PROT_NONE: p = PROT_NONE; break; 2783 case MEM_PROT_READ: p = PROT_READ; break; 2784 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2785 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2786 default: 2787 ShouldNotReachHere(); 2788 } 2789 // is_committed is unused. 2790 return solaris_mprotect(addr, bytes, p); 2791 } 2792 2793 // guard_memory and unguard_memory only happens within stack guard pages. 2794 // Since ISM pertains only to the heap, guard and unguard memory should not 2795 /// happen with an ISM region. 2796 bool os::guard_memory(char* addr, size_t bytes) { 2797 return solaris_mprotect(addr, bytes, PROT_NONE); 2798 } 2799 2800 bool os::unguard_memory(char* addr, size_t bytes) { 2801 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 2802 } 2803 2804 // Large page support 2805 static size_t _large_page_size = 0; 2806 2807 // Insertion sort for small arrays (descending order). 2808 static void insertion_sort_descending(size_t* array, int len) { 2809 for (int i = 0; i < len; i++) { 2810 size_t val = array[i]; 2811 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 2812 size_t tmp = array[key]; 2813 array[key] = array[key - 1]; 2814 array[key - 1] = tmp; 2815 } 2816 } 2817 } 2818 2819 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) { 2820 const unsigned int usable_count = VM_Version::page_size_count(); 2821 if (usable_count == 1) { 2822 return false; 2823 } 2824 2825 // Find the right getpagesizes interface. When solaris 11 is the minimum 2826 // build platform, getpagesizes() (without the '2') can be called directly. 2827 typedef int (*gps_t)(size_t[], int); 2828 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); 2829 if (gps_func == NULL) { 2830 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); 2831 if (gps_func == NULL) { 2832 if (warn) { 2833 warning("MPSS is not supported by the operating system."); 2834 } 2835 return false; 2836 } 2837 } 2838 2839 // Fill the array of page sizes. 2840 int n = (*gps_func)(_page_sizes, page_sizes_max); 2841 assert(n > 0, "Solaris bug?"); 2842 2843 if (n == page_sizes_max) { 2844 // Add a sentinel value (necessary only if the array was completely filled 2845 // since it is static (zeroed at initialization)). 2846 _page_sizes[--n] = 0; 2847 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 2848 } 2849 assert(_page_sizes[n] == 0, "missing sentinel"); 2850 trace_page_sizes("available page sizes", _page_sizes, n); 2851 2852 if (n == 1) return false; // Only one page size available. 2853 2854 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 2855 // select up to usable_count elements. First sort the array, find the first 2856 // acceptable value, then copy the usable sizes to the top of the array and 2857 // trim the rest. Make sure to include the default page size :-). 2858 // 2859 // A better policy could get rid of the 4M limit by taking the sizes of the 2860 // important VM memory regions (java heap and possibly the code cache) into 2861 // account. 2862 insertion_sort_descending(_page_sizes, n); 2863 const size_t size_limit = 2864 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 2865 int beg; 2866 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */; 2867 const int end = MIN2((int)usable_count, n) - 1; 2868 for (int cur = 0; cur < end; ++cur, ++beg) { 2869 _page_sizes[cur] = _page_sizes[beg]; 2870 } 2871 _page_sizes[end] = vm_page_size(); 2872 _page_sizes[end + 1] = 0; 2873 2874 if (_page_sizes[end] > _page_sizes[end - 1]) { 2875 // Default page size is not the smallest; sort again. 2876 insertion_sort_descending(_page_sizes, end + 1); 2877 } 2878 *page_size = _page_sizes[0]; 2879 2880 trace_page_sizes("usable page sizes", _page_sizes, end + 1); 2881 return true; 2882 } 2883 2884 void os::large_page_init() { 2885 if (UseLargePages) { 2886 // print a warning if any large page related flag is specified on command line 2887 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2888 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2889 2890 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 2891 } 2892 } 2893 2894 bool os::Solaris::is_valid_page_size(size_t bytes) { 2895 for (int i = 0; _page_sizes[i] != 0; i++) { 2896 if (_page_sizes[i] == bytes) { 2897 return true; 2898 } 2899 } 2900 return false; 2901 } 2902 2903 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) { 2904 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align); 2905 assert(is_aligned((void*) start, align), 2906 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align); 2907 assert(is_aligned(bytes, align), 2908 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align); 2909 2910 // Signal to OS that we want large pages for addresses 2911 // from addr, addr + bytes 2912 struct memcntl_mha mpss_struct; 2913 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 2914 mpss_struct.mha_pagesize = align; 2915 mpss_struct.mha_flags = 0; 2916 // Upon successful completion, memcntl() returns 0 2917 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) { 2918 debug_only(warning("Attempt to use MPSS failed.")); 2919 return false; 2920 } 2921 return true; 2922 } 2923 2924 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) { 2925 fatal("os::reserve_memory_special should not be called on Solaris."); 2926 return NULL; 2927 } 2928 2929 bool os::release_memory_special(char* base, size_t bytes) { 2930 fatal("os::release_memory_special should not be called on Solaris."); 2931 return false; 2932 } 2933 2934 size_t os::large_page_size() { 2935 return _large_page_size; 2936 } 2937 2938 // MPSS allows application to commit large page memory on demand; with ISM 2939 // the entire memory region must be allocated as shared memory. 2940 bool os::can_commit_large_page_memory() { 2941 return true; 2942 } 2943 2944 bool os::can_execute_large_page_memory() { 2945 return true; 2946 } 2947 2948 // Read calls from inside the vm need to perform state transitions 2949 size_t os::read(int fd, void *buf, unsigned int nBytes) { 2950 size_t res; 2951 JavaThread* thread = (JavaThread*)Thread::current(); 2952 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 2953 ThreadBlockInVM tbiv(thread); 2954 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 2955 return res; 2956 } 2957 2958 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 2959 size_t res; 2960 JavaThread* thread = (JavaThread*)Thread::current(); 2961 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 2962 ThreadBlockInVM tbiv(thread); 2963 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res); 2964 return res; 2965 } 2966 2967 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) { 2968 size_t res; 2969 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 2970 "Assumed _thread_in_native"); 2971 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 2972 return res; 2973 } 2974 2975 void os::naked_short_sleep(jlong ms) { 2976 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 2977 2978 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but 2979 // Solaris requires -lrt for this. 2980 usleep((ms * 1000)); 2981 2982 return; 2983 } 2984 2985 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2986 void os::infinite_sleep() { 2987 while (true) { // sleep forever ... 2988 ::sleep(100); // ... 100 seconds at a time 2989 } 2990 } 2991 2992 // Used to convert frequent JVM_Yield() to nops 2993 bool os::dont_yield() { 2994 if (DontYieldALot) { 2995 static hrtime_t last_time = 0; 2996 hrtime_t diff = getTimeNanos() - last_time; 2997 2998 if (diff < DontYieldALotInterval * 1000000) { 2999 return true; 3000 } 3001 3002 last_time += diff; 3003 3004 return false; 3005 } else { 3006 return false; 3007 } 3008 } 3009 3010 // Note that yield semantics are defined by the scheduling class to which 3011 // the thread currently belongs. Typically, yield will _not yield to 3012 // other equal or higher priority threads that reside on the dispatch queues 3013 // of other CPUs. 3014 3015 void os::naked_yield() { 3016 thr_yield(); 3017 } 3018 3019 // Interface for setting lwp priorities. We are using T2 libthread, 3020 // which forces the use of bound threads, so all of our threads will 3021 // be assigned to real lwp's. Using the thr_setprio function is 3022 // meaningless in this mode so we must adjust the real lwp's priority. 3023 // The routines below implement the getting and setting of lwp priorities. 3024 // 3025 // Note: There are three priority scales used on Solaris. Java priotities 3026 // which range from 1 to 10, libthread "thr_setprio" scale which range 3027 // from 0 to 127, and the current scheduling class of the process we 3028 // are running in. This is typically from -60 to +60. 3029 // The setting of the lwp priorities in done after a call to thr_setprio 3030 // so Java priorities are mapped to libthread priorities and we map from 3031 // the latter to lwp priorities. We don't keep priorities stored in 3032 // Java priorities since some of our worker threads want to set priorities 3033 // higher than all Java threads. 3034 // 3035 // For related information: 3036 // (1) man -s 2 priocntl 3037 // (2) man -s 4 priocntl 3038 // (3) man dispadmin 3039 // = librt.so 3040 // = libthread/common/rtsched.c - thrp_setlwpprio(). 3041 // = ps -cL <pid> ... to validate priority. 3042 // = sched_get_priority_min and _max 3043 // pthread_create 3044 // sched_setparam 3045 // pthread_setschedparam 3046 // 3047 // Assumptions: 3048 // + We assume that all threads in the process belong to the same 3049 // scheduling class. IE. an homogenous process. 3050 // + Must be root or in IA group to change change "interactive" attribute. 3051 // Priocntl() will fail silently. The only indication of failure is when 3052 // we read-back the value and notice that it hasn't changed. 3053 // + Interactive threads enter the runq at the head, non-interactive at the tail. 3054 // + For RT, change timeslice as well. Invariant: 3055 // constant "priority integral" 3056 // Konst == TimeSlice * (60-Priority) 3057 // Given a priority, compute appropriate timeslice. 3058 // + Higher numerical values have higher priority. 3059 3060 // sched class attributes 3061 typedef struct { 3062 int schedPolicy; // classID 3063 int maxPrio; 3064 int minPrio; 3065 } SchedInfo; 3066 3067 3068 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; 3069 3070 #ifdef ASSERT 3071 static int ReadBackValidate = 1; 3072 #endif 3073 static int myClass = 0; 3074 static int myMin = 0; 3075 static int myMax = 0; 3076 static int myCur = 0; 3077 static bool priocntl_enable = false; 3078 3079 static const int criticalPrio = FXCriticalPriority; 3080 static int java_MaxPriority_to_os_priority = 0; // Saved mapping 3081 3082 3083 // lwp_priocntl_init 3084 // 3085 // Try to determine the priority scale for our process. 3086 // 3087 // Return errno or 0 if OK. 3088 // 3089 static int lwp_priocntl_init() { 3090 int rslt; 3091 pcinfo_t ClassInfo; 3092 pcparms_t ParmInfo; 3093 int i; 3094 3095 if (!UseThreadPriorities) return 0; 3096 3097 // If ThreadPriorityPolicy is 1, switch tables 3098 if (ThreadPriorityPolicy == 1) { 3099 for (i = 0; i < CriticalPriority+1; i++) 3100 os::java_to_os_priority[i] = prio_policy1[i]; 3101 } 3102 if (UseCriticalJavaThreadPriority) { 3103 // MaxPriority always maps to the FX scheduling class and criticalPrio. 3104 // See set_native_priority() and set_lwp_class_and_priority(). 3105 // Save original MaxPriority mapping in case attempt to 3106 // use critical priority fails. 3107 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; 3108 // Set negative to distinguish from other priorities 3109 os::java_to_os_priority[MaxPriority] = -criticalPrio; 3110 } 3111 3112 // Get IDs for a set of well-known scheduling classes. 3113 // TODO-FIXME: GETCLINFO returns the current # of classes in the 3114 // the system. We should have a loop that iterates over the 3115 // classID values, which are known to be "small" integers. 3116 3117 strcpy(ClassInfo.pc_clname, "TS"); 3118 ClassInfo.pc_cid = -1; 3119 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3120 if (rslt < 0) return errno; 3121 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 3122 tsLimits.schedPolicy = ClassInfo.pc_cid; 3123 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 3124 tsLimits.minPrio = -tsLimits.maxPrio; 3125 3126 strcpy(ClassInfo.pc_clname, "IA"); 3127 ClassInfo.pc_cid = -1; 3128 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3129 if (rslt < 0) return errno; 3130 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 3131 iaLimits.schedPolicy = ClassInfo.pc_cid; 3132 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 3133 iaLimits.minPrio = -iaLimits.maxPrio; 3134 3135 strcpy(ClassInfo.pc_clname, "RT"); 3136 ClassInfo.pc_cid = -1; 3137 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3138 if (rslt < 0) return errno; 3139 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 3140 rtLimits.schedPolicy = ClassInfo.pc_cid; 3141 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 3142 rtLimits.minPrio = 0; 3143 3144 strcpy(ClassInfo.pc_clname, "FX"); 3145 ClassInfo.pc_cid = -1; 3146 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3147 if (rslt < 0) return errno; 3148 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); 3149 fxLimits.schedPolicy = ClassInfo.pc_cid; 3150 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; 3151 fxLimits.minPrio = 0; 3152 3153 // Query our "current" scheduling class. 3154 // This will normally be IA, TS or, rarely, FX or RT. 3155 memset(&ParmInfo, 0, sizeof(ParmInfo)); 3156 ParmInfo.pc_cid = PC_CLNULL; 3157 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3158 if (rslt < 0) return errno; 3159 myClass = ParmInfo.pc_cid; 3160 3161 // We now know our scheduling classId, get specific information 3162 // about the class. 3163 ClassInfo.pc_cid = myClass; 3164 ClassInfo.pc_clname[0] = 0; 3165 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); 3166 if (rslt < 0) return errno; 3167 3168 if (ThreadPriorityVerbose) { 3169 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 3170 } 3171 3172 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3173 ParmInfo.pc_cid = PC_CLNULL; 3174 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3175 if (rslt < 0) return errno; 3176 3177 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3178 myMin = rtLimits.minPrio; 3179 myMax = rtLimits.maxPrio; 3180 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3181 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3182 myMin = iaLimits.minPrio; 3183 myMax = iaLimits.maxPrio; 3184 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 3185 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3186 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3187 myMin = tsLimits.minPrio; 3188 myMax = tsLimits.maxPrio; 3189 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 3190 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3191 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3192 myMin = fxLimits.minPrio; 3193 myMax = fxLimits.maxPrio; 3194 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict 3195 } else { 3196 // No clue - punt 3197 if (ThreadPriorityVerbose) { 3198 tty->print_cr("Unknown scheduling class: %s ... \n", 3199 ClassInfo.pc_clname); 3200 } 3201 return EINVAL; // no clue, punt 3202 } 3203 3204 if (ThreadPriorityVerbose) { 3205 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax); 3206 } 3207 3208 priocntl_enable = true; // Enable changing priorities 3209 return 0; 3210 } 3211 3212 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 3213 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 3214 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 3215 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) 3216 3217 3218 // scale_to_lwp_priority 3219 // 3220 // Convert from the libthread "thr_setprio" scale to our current 3221 // lwp scheduling class scale. 3222 // 3223 static int scale_to_lwp_priority(int rMin, int rMax, int x) { 3224 int v; 3225 3226 if (x == 127) return rMax; // avoid round-down 3227 v = (((x*(rMax-rMin)))/128)+rMin; 3228 return v; 3229 } 3230 3231 3232 // set_lwp_class_and_priority 3233 int set_lwp_class_and_priority(int ThreadID, int lwpid, 3234 int newPrio, int new_class, bool scale) { 3235 int rslt; 3236 int Actual, Expected, prv; 3237 pcparms_t ParmInfo; // for GET-SET 3238 #ifdef ASSERT 3239 pcparms_t ReadBack; // for readback 3240 #endif 3241 3242 // Set priority via PC_GETPARMS, update, PC_SETPARMS 3243 // Query current values. 3244 // TODO: accelerate this by eliminating the PC_GETPARMS call. 3245 // Cache "pcparms_t" in global ParmCache. 3246 // TODO: elide set-to-same-value 3247 3248 // If something went wrong on init, don't change priorities. 3249 if (!priocntl_enable) { 3250 if (ThreadPriorityVerbose) { 3251 tty->print_cr("Trying to set priority but init failed, ignoring"); 3252 } 3253 return EINVAL; 3254 } 3255 3256 // If lwp hasn't started yet, just return 3257 // the _start routine will call us again. 3258 if (lwpid <= 0) { 3259 if (ThreadPriorityVerbose) { 3260 tty->print_cr("deferring the set_lwp_class_and_priority of thread " 3261 INTPTR_FORMAT " to %d, lwpid not set", 3262 ThreadID, newPrio); 3263 } 3264 return 0; 3265 } 3266 3267 if (ThreadPriorityVerbose) { 3268 tty->print_cr ("set_lwp_class_and_priority(" 3269 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 3270 ThreadID, lwpid, newPrio); 3271 } 3272 3273 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3274 ParmInfo.pc_cid = PC_CLNULL; 3275 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 3276 if (rslt < 0) return errno; 3277 3278 int cur_class = ParmInfo.pc_cid; 3279 ParmInfo.pc_cid = (id_t)new_class; 3280 3281 if (new_class == rtLimits.schedPolicy) { 3282 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 3283 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, 3284 rtLimits.maxPrio, newPrio) 3285 : newPrio; 3286 rtInfo->rt_tqsecs = RT_NOCHANGE; 3287 rtInfo->rt_tqnsecs = RT_NOCHANGE; 3288 if (ThreadPriorityVerbose) { 3289 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 3290 } 3291 } else if (new_class == iaLimits.schedPolicy) { 3292 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3293 int maxClamped = MIN2(iaLimits.maxPrio, 3294 cur_class == new_class 3295 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); 3296 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, 3297 maxClamped, newPrio) 3298 : newPrio; 3299 iaInfo->ia_uprilim = cur_class == new_class 3300 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; 3301 iaInfo->ia_mode = IA_NOCHANGE; 3302 if (ThreadPriorityVerbose) { 3303 tty->print_cr("IA: [%d...%d] %d->%d\n", 3304 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 3305 } 3306 } else if (new_class == tsLimits.schedPolicy) { 3307 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3308 int maxClamped = MIN2(tsLimits.maxPrio, 3309 cur_class == new_class 3310 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); 3311 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, 3312 maxClamped, newPrio) 3313 : newPrio; 3314 tsInfo->ts_uprilim = cur_class == new_class 3315 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; 3316 if (ThreadPriorityVerbose) { 3317 tty->print_cr("TS: [%d...%d] %d->%d\n", 3318 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 3319 } 3320 } else if (new_class == fxLimits.schedPolicy) { 3321 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3322 int maxClamped = MIN2(fxLimits.maxPrio, 3323 cur_class == new_class 3324 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); 3325 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, 3326 maxClamped, newPrio) 3327 : newPrio; 3328 fxInfo->fx_uprilim = cur_class == new_class 3329 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; 3330 fxInfo->fx_tqsecs = FX_NOCHANGE; 3331 fxInfo->fx_tqnsecs = FX_NOCHANGE; 3332 if (ThreadPriorityVerbose) { 3333 tty->print_cr("FX: [%d...%d] %d->%d\n", 3334 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); 3335 } 3336 } else { 3337 if (ThreadPriorityVerbose) { 3338 tty->print_cr("Unknown new scheduling class %d\n", new_class); 3339 } 3340 return EINVAL; // no clue, punt 3341 } 3342 3343 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 3344 if (ThreadPriorityVerbose && rslt) { 3345 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 3346 } 3347 if (rslt < 0) return errno; 3348 3349 #ifdef ASSERT 3350 // Sanity check: read back what we just attempted to set. 3351 // In theory it could have changed in the interim ... 3352 // 3353 // The priocntl system call is tricky. 3354 // Sometimes it'll validate the priority value argument and 3355 // return EINVAL if unhappy. At other times it fails silently. 3356 // Readbacks are prudent. 3357 3358 if (!ReadBackValidate) return 0; 3359 3360 memset(&ReadBack, 0, sizeof(pcparms_t)); 3361 ReadBack.pc_cid = PC_CLNULL; 3362 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 3363 assert(rslt >= 0, "priocntl failed"); 3364 Actual = Expected = 0xBAD; 3365 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3366 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3367 Actual = RTPRI(ReadBack)->rt_pri; 3368 Expected = RTPRI(ParmInfo)->rt_pri; 3369 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3370 Actual = IAPRI(ReadBack)->ia_upri; 3371 Expected = IAPRI(ParmInfo)->ia_upri; 3372 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3373 Actual = TSPRI(ReadBack)->ts_upri; 3374 Expected = TSPRI(ParmInfo)->ts_upri; 3375 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3376 Actual = FXPRI(ReadBack)->fx_upri; 3377 Expected = FXPRI(ParmInfo)->fx_upri; 3378 } else { 3379 if (ThreadPriorityVerbose) { 3380 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", 3381 ParmInfo.pc_cid); 3382 } 3383 } 3384 3385 if (Actual != Expected) { 3386 if (ThreadPriorityVerbose) { 3387 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 3388 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 3389 } 3390 } 3391 #endif 3392 3393 return 0; 3394 } 3395 3396 // Solaris only gives access to 128 real priorities at a time, 3397 // so we expand Java's ten to fill this range. This would be better 3398 // if we dynamically adjusted relative priorities. 3399 // 3400 // The ThreadPriorityPolicy option allows us to select 2 different 3401 // priority scales. 3402 // 3403 // ThreadPriorityPolicy=0 3404 // Since the Solaris' default priority is MaximumPriority, we do not 3405 // set a priority lower than Max unless a priority lower than 3406 // NormPriority is requested. 3407 // 3408 // ThreadPriorityPolicy=1 3409 // This mode causes the priority table to get filled with 3410 // linear values. NormPriority get's mapped to 50% of the 3411 // Maximum priority an so on. This will cause VM threads 3412 // to get unfair treatment against other Solaris processes 3413 // which do not explicitly alter their thread priorities. 3414 3415 int os::java_to_os_priority[CriticalPriority + 1] = { 3416 -99999, // 0 Entry should never be used 3417 3418 0, // 1 MinPriority 3419 32, // 2 3420 64, // 3 3421 3422 96, // 4 3423 127, // 5 NormPriority 3424 127, // 6 3425 3426 127, // 7 3427 127, // 8 3428 127, // 9 NearMaxPriority 3429 3430 127, // 10 MaxPriority 3431 3432 -criticalPrio // 11 CriticalPriority 3433 }; 3434 3435 OSReturn os::set_native_priority(Thread* thread, int newpri) { 3436 OSThread* osthread = thread->osthread(); 3437 3438 // Save requested priority in case the thread hasn't been started 3439 osthread->set_native_priority(newpri); 3440 3441 // Check for critical priority request 3442 bool fxcritical = false; 3443 if (newpri == -criticalPrio) { 3444 fxcritical = true; 3445 newpri = criticalPrio; 3446 } 3447 3448 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 3449 if (!UseThreadPriorities) return OS_OK; 3450 3451 int status = 0; 3452 3453 if (!fxcritical) { 3454 // Use thr_setprio only if we have a priority that thr_setprio understands 3455 status = thr_setprio(thread->osthread()->thread_id(), newpri); 3456 } 3457 3458 int lwp_status = 3459 set_lwp_class_and_priority(osthread->thread_id(), 3460 osthread->lwp_id(), 3461 newpri, 3462 fxcritical ? fxLimits.schedPolicy : myClass, 3463 !fxcritical); 3464 if (lwp_status != 0 && fxcritical) { 3465 // Try again, this time without changing the scheduling class 3466 newpri = java_MaxPriority_to_os_priority; 3467 lwp_status = set_lwp_class_and_priority(osthread->thread_id(), 3468 osthread->lwp_id(), 3469 newpri, myClass, false); 3470 } 3471 status |= lwp_status; 3472 return (status == 0) ? OS_OK : OS_ERR; 3473 } 3474 3475 3476 OSReturn os::get_native_priority(const Thread* const thread, 3477 int *priority_ptr) { 3478 int p; 3479 if (!UseThreadPriorities) { 3480 *priority_ptr = NormalPriority; 3481 return OS_OK; 3482 } 3483 int status = thr_getprio(thread->osthread()->thread_id(), &p); 3484 if (status != 0) { 3485 return OS_ERR; 3486 } 3487 *priority_ptr = p; 3488 return OS_OK; 3489 } 3490 3491 3492 // Hint to the underlying OS that a task switch would not be good. 3493 // Void return because it's a hint and can fail. 3494 void os::hint_no_preempt() { 3495 schedctl_start(schedctl_init()); 3496 } 3497 3498 static void resume_clear_context(OSThread *osthread) { 3499 osthread->set_ucontext(NULL); 3500 } 3501 3502 static void suspend_save_context(OSThread *osthread, ucontext_t* context) { 3503 osthread->set_ucontext(context); 3504 } 3505 3506 static PosixSemaphore sr_semaphore; 3507 3508 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) { 3509 // Save and restore errno to avoid confusing native code with EINTR 3510 // after sigsuspend. 3511 int old_errno = errno; 3512 3513 OSThread* osthread = thread->osthread(); 3514 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 3515 3516 os::SuspendResume::State current = osthread->sr.state(); 3517 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 3518 suspend_save_context(osthread, uc); 3519 3520 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 3521 os::SuspendResume::State state = osthread->sr.suspended(); 3522 if (state == os::SuspendResume::SR_SUSPENDED) { 3523 sigset_t suspend_set; // signals for sigsuspend() 3524 3525 // get current set of blocked signals and unblock resume signal 3526 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 3527 sigdelset(&suspend_set, ASYNC_SIGNAL); 3528 3529 sr_semaphore.signal(); 3530 // wait here until we are resumed 3531 while (1) { 3532 sigsuspend(&suspend_set); 3533 3534 os::SuspendResume::State result = osthread->sr.running(); 3535 if (result == os::SuspendResume::SR_RUNNING) { 3536 sr_semaphore.signal(); 3537 break; 3538 } 3539 } 3540 3541 } else if (state == os::SuspendResume::SR_RUNNING) { 3542 // request was cancelled, continue 3543 } else { 3544 ShouldNotReachHere(); 3545 } 3546 3547 resume_clear_context(osthread); 3548 } else if (current == os::SuspendResume::SR_RUNNING) { 3549 // request was cancelled, continue 3550 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 3551 // ignore 3552 } else { 3553 // ignore 3554 } 3555 3556 errno = old_errno; 3557 } 3558 3559 void os::print_statistics() { 3560 } 3561 3562 bool os::message_box(const char* title, const char* message) { 3563 int i; 3564 fdStream err(defaultStream::error_fd()); 3565 for (i = 0; i < 78; i++) err.print_raw("="); 3566 err.cr(); 3567 err.print_raw_cr(title); 3568 for (i = 0; i < 78; i++) err.print_raw("-"); 3569 err.cr(); 3570 err.print_raw_cr(message); 3571 for (i = 0; i < 78; i++) err.print_raw("="); 3572 err.cr(); 3573 3574 char buf[16]; 3575 // Prevent process from exiting upon "read error" without consuming all CPU 3576 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3577 3578 return buf[0] == 'y' || buf[0] == 'Y'; 3579 } 3580 3581 static int sr_notify(OSThread* osthread) { 3582 int status = thr_kill(osthread->thread_id(), ASYNC_SIGNAL); 3583 assert_status(status == 0, status, "thr_kill"); 3584 return status; 3585 } 3586 3587 // "Randomly" selected value for how long we want to spin 3588 // before bailing out on suspending a thread, also how often 3589 // we send a signal to a thread we want to resume 3590 static const int RANDOMLY_LARGE_INTEGER = 1000000; 3591 static const int RANDOMLY_LARGE_INTEGER2 = 100; 3592 3593 static bool do_suspend(OSThread* osthread) { 3594 assert(osthread->sr.is_running(), "thread should be running"); 3595 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 3596 3597 // mark as suspended and send signal 3598 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 3599 // failed to switch, state wasn't running? 3600 ShouldNotReachHere(); 3601 return false; 3602 } 3603 3604 if (sr_notify(osthread) != 0) { 3605 ShouldNotReachHere(); 3606 } 3607 3608 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 3609 while (true) { 3610 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) { 3611 break; 3612 } else { 3613 // timeout 3614 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 3615 if (cancelled == os::SuspendResume::SR_RUNNING) { 3616 return false; 3617 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 3618 // make sure that we consume the signal on the semaphore as well 3619 sr_semaphore.wait(); 3620 break; 3621 } else { 3622 ShouldNotReachHere(); 3623 return false; 3624 } 3625 } 3626 } 3627 3628 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 3629 return true; 3630 } 3631 3632 static void do_resume(OSThread* osthread) { 3633 assert(osthread->sr.is_suspended(), "thread should be suspended"); 3634 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 3635 3636 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 3637 // failed to switch to WAKEUP_REQUEST 3638 ShouldNotReachHere(); 3639 return; 3640 } 3641 3642 while (true) { 3643 if (sr_notify(osthread) == 0) { 3644 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 3645 if (osthread->sr.is_running()) { 3646 return; 3647 } 3648 } 3649 } else { 3650 ShouldNotReachHere(); 3651 } 3652 } 3653 3654 guarantee(osthread->sr.is_running(), "Must be running!"); 3655 } 3656 3657 void os::SuspendedThreadTask::internal_do_task() { 3658 if (do_suspend(_thread->osthread())) { 3659 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3660 do_task(context); 3661 do_resume(_thread->osthread()); 3662 } 3663 } 3664 3665 class PcFetcher : public os::SuspendedThreadTask { 3666 public: 3667 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} 3668 ExtendedPC result(); 3669 protected: 3670 void do_task(const os::SuspendedThreadTaskContext& context); 3671 private: 3672 ExtendedPC _epc; 3673 }; 3674 3675 ExtendedPC PcFetcher::result() { 3676 guarantee(is_done(), "task is not done yet."); 3677 return _epc; 3678 } 3679 3680 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { 3681 Thread* thread = context.thread(); 3682 OSThread* osthread = thread->osthread(); 3683 if (osthread->ucontext() != NULL) { 3684 _epc = os::Solaris::ucontext_get_pc((const ucontext_t *) context.ucontext()); 3685 } else { 3686 // NULL context is unexpected, double-check this is the VMThread 3687 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 3688 } 3689 } 3690 3691 // A lightweight implementation that does not suspend the target thread and 3692 // thus returns only a hint. Used for profiling only! 3693 ExtendedPC os::get_thread_pc(Thread* thread) { 3694 // Make sure that it is called by the watcher and the Threads lock is owned. 3695 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock"); 3696 // For now, is only used to profile the VM Thread 3697 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3698 PcFetcher fetcher(thread); 3699 fetcher.run(); 3700 return fetcher.result(); 3701 } 3702 3703 3704 // This does not do anything on Solaris. This is basically a hook for being 3705 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 3706 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3707 const methodHandle& method, JavaCallArguments* args, 3708 Thread* thread) { 3709 f(value, method, args, thread); 3710 } 3711 3712 // This routine may be used by user applications as a "hook" to catch signals. 3713 // The user-defined signal handler must pass unrecognized signals to this 3714 // routine, and if it returns true (non-zero), then the signal handler must 3715 // return immediately. If the flag "abort_if_unrecognized" is true, then this 3716 // routine will never retun false (zero), but instead will execute a VM panic 3717 // routine kill the process. 3718 // 3719 // If this routine returns false, it is OK to call it again. This allows 3720 // the user-defined signal handler to perform checks either before or after 3721 // the VM performs its own checks. Naturally, the user code would be making 3722 // a serious error if it tried to handle an exception (such as a null check 3723 // or breakpoint) that the VM was generating for its own correct operation. 3724 // 3725 // This routine may recognize any of the following kinds of signals: 3726 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 3727 // ASYNC_SIGNAL. 3728 // It should be consulted by handlers for any of those signals. 3729 // 3730 // The caller of this routine must pass in the three arguments supplied 3731 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 3732 // field of the structure passed to sigaction(). This routine assumes that 3733 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3734 // 3735 // Note that the VM will print warnings if it detects conflicting signal 3736 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3737 // 3738 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo, 3739 siginfo_t* siginfo, 3740 void* ucontext, 3741 int abort_if_unrecognized); 3742 3743 3744 void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 3745 int orig_errno = errno; // Preserve errno value over signal handler. 3746 JVM_handle_solaris_signal(sig, info, ucVoid, true); 3747 errno = orig_errno; 3748 } 3749 3750 // This boolean allows users to forward their own non-matching signals 3751 // to JVM_handle_solaris_signal, harmlessly. 3752 bool os::Solaris::signal_handlers_are_installed = false; 3753 3754 // For signal-chaining 3755 bool os::Solaris::libjsig_is_loaded = false; 3756 typedef struct sigaction *(*get_signal_t)(int); 3757 get_signal_t os::Solaris::get_signal_action = NULL; 3758 3759 struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 3760 struct sigaction *actp = NULL; 3761 3762 if ((libjsig_is_loaded) && (sig <= Maxsignum)) { 3763 // Retrieve the old signal handler from libjsig 3764 actp = (*get_signal_action)(sig); 3765 } 3766 if (actp == NULL) { 3767 // Retrieve the preinstalled signal handler from jvm 3768 actp = get_preinstalled_handler(sig); 3769 } 3770 3771 return actp; 3772 } 3773 3774 static bool call_chained_handler(struct sigaction *actp, int sig, 3775 siginfo_t *siginfo, void *context) { 3776 // Call the old signal handler 3777 if (actp->sa_handler == SIG_DFL) { 3778 // It's more reasonable to let jvm treat it as an unexpected exception 3779 // instead of taking the default action. 3780 return false; 3781 } else if (actp->sa_handler != SIG_IGN) { 3782 if ((actp->sa_flags & SA_NODEFER) == 0) { 3783 // automaticlly block the signal 3784 sigaddset(&(actp->sa_mask), sig); 3785 } 3786 3787 sa_handler_t hand; 3788 sa_sigaction_t sa; 3789 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3790 // retrieve the chained handler 3791 if (siginfo_flag_set) { 3792 sa = actp->sa_sigaction; 3793 } else { 3794 hand = actp->sa_handler; 3795 } 3796 3797 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3798 actp->sa_handler = SIG_DFL; 3799 } 3800 3801 // try to honor the signal mask 3802 sigset_t oset; 3803 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3804 3805 // call into the chained handler 3806 if (siginfo_flag_set) { 3807 (*sa)(sig, siginfo, context); 3808 } else { 3809 (*hand)(sig); 3810 } 3811 3812 // restore the signal mask 3813 pthread_sigmask(SIG_SETMASK, &oset, 0); 3814 } 3815 // Tell jvm's signal handler the signal is taken care of. 3816 return true; 3817 } 3818 3819 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3820 bool chained = false; 3821 // signal-chaining 3822 if (UseSignalChaining) { 3823 struct sigaction *actp = get_chained_signal_action(sig); 3824 if (actp != NULL) { 3825 chained = call_chained_handler(actp, sig, siginfo, context); 3826 } 3827 } 3828 return chained; 3829 } 3830 3831 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 3832 assert((chainedsigactions != (struct sigaction *)NULL) && 3833 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3834 if (preinstalled_sigs[sig] != 0) { 3835 return &chainedsigactions[sig]; 3836 } 3837 return NULL; 3838 } 3839 3840 void os::Solaris::save_preinstalled_handler(int sig, 3841 struct sigaction& oldAct) { 3842 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 3843 assert((chainedsigactions != (struct sigaction *)NULL) && 3844 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3845 chainedsigactions[sig] = oldAct; 3846 preinstalled_sigs[sig] = 1; 3847 } 3848 3849 void os::Solaris::set_signal_handler(int sig, bool set_installed, 3850 bool oktochain) { 3851 // Check for overwrite. 3852 struct sigaction oldAct; 3853 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3854 void* oldhand = 3855 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3856 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3857 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3858 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3859 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 3860 if (AllowUserSignalHandlers || !set_installed) { 3861 // Do not overwrite; user takes responsibility to forward to us. 3862 return; 3863 } else if (UseSignalChaining) { 3864 if (oktochain) { 3865 // save the old handler in jvm 3866 save_preinstalled_handler(sig, oldAct); 3867 } else { 3868 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal."); 3869 } 3870 // libjsig also interposes the sigaction() call below and saves the 3871 // old sigaction on it own. 3872 } else { 3873 fatal("Encountered unexpected pre-existing sigaction handler " 3874 "%#lx for signal %d.", (long)oldhand, sig); 3875 } 3876 } 3877 3878 struct sigaction sigAct; 3879 sigfillset(&(sigAct.sa_mask)); 3880 sigAct.sa_handler = SIG_DFL; 3881 3882 sigAct.sa_sigaction = signalHandler; 3883 // Handle SIGSEGV on alternate signal stack if 3884 // not using stack banging 3885 if (!UseStackBanging && sig == SIGSEGV) { 3886 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 3887 } else { 3888 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 3889 } 3890 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 3891 3892 sigaction(sig, &sigAct, &oldAct); 3893 3894 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3895 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3896 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3897 } 3898 3899 3900 #define DO_SIGNAL_CHECK(sig) \ 3901 do { \ 3902 if (!sigismember(&check_signal_done, sig)) { \ 3903 os::Solaris::check_signal_handler(sig); \ 3904 } \ 3905 } while (0) 3906 3907 // This method is a periodic task to check for misbehaving JNI applications 3908 // under CheckJNI, we can add any periodic checks here 3909 3910 void os::run_periodic_checks() { 3911 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 3912 // thereby preventing a NULL checks. 3913 if (!check_addr0_done) check_addr0_done = check_addr0(tty); 3914 3915 if (check_signals == false) return; 3916 3917 // SEGV and BUS if overridden could potentially prevent 3918 // generation of hs*.log in the event of a crash, debugging 3919 // such a case can be very challenging, so we absolutely 3920 // check for the following for a good measure: 3921 DO_SIGNAL_CHECK(SIGSEGV); 3922 DO_SIGNAL_CHECK(SIGILL); 3923 DO_SIGNAL_CHECK(SIGFPE); 3924 DO_SIGNAL_CHECK(SIGBUS); 3925 DO_SIGNAL_CHECK(SIGPIPE); 3926 DO_SIGNAL_CHECK(SIGXFSZ); 3927 DO_SIGNAL_CHECK(ASYNC_SIGNAL); 3928 3929 // ReduceSignalUsage allows the user to override these handlers 3930 // see comments at the very top and jvm_solaris.h 3931 if (!ReduceSignalUsage) { 3932 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3933 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3934 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3935 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3936 } 3937 } 3938 3939 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3940 3941 static os_sigaction_t os_sigaction = NULL; 3942 3943 void os::Solaris::check_signal_handler(int sig) { 3944 char buf[O_BUFLEN]; 3945 address jvmHandler = NULL; 3946 3947 struct sigaction act; 3948 if (os_sigaction == NULL) { 3949 // only trust the default sigaction, in case it has been interposed 3950 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3951 if (os_sigaction == NULL) return; 3952 } 3953 3954 os_sigaction(sig, (struct sigaction*)NULL, &act); 3955 3956 address thisHandler = (act.sa_flags & SA_SIGINFO) 3957 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3958 : CAST_FROM_FN_PTR(address, act.sa_handler); 3959 3960 3961 switch (sig) { 3962 case SIGSEGV: 3963 case SIGBUS: 3964 case SIGFPE: 3965 case SIGPIPE: 3966 case SIGXFSZ: 3967 case SIGILL: 3968 case ASYNC_SIGNAL: 3969 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 3970 break; 3971 3972 case SHUTDOWN1_SIGNAL: 3973 case SHUTDOWN2_SIGNAL: 3974 case SHUTDOWN3_SIGNAL: 3975 case BREAK_SIGNAL: 3976 jvmHandler = (address)user_handler(); 3977 break; 3978 3979 default: 3980 return; 3981 } 3982 3983 if (thisHandler != jvmHandler) { 3984 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3985 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3986 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3987 // No need to check this sig any longer 3988 sigaddset(&check_signal_done, sig); 3989 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3990 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3991 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3992 exception_name(sig, buf, O_BUFLEN)); 3993 } 3994 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 3995 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3996 tty->print("expected:"); 3997 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig)); 3998 tty->cr(); 3999 tty->print(" found:"); 4000 os::Posix::print_sa_flags(tty, act.sa_flags); 4001 tty->cr(); 4002 // No need to check this sig any longer 4003 sigaddset(&check_signal_done, sig); 4004 } 4005 4006 // Print all the signal handler state 4007 if (sigismember(&check_signal_done, sig)) { 4008 print_signal_handlers(tty, buf, O_BUFLEN); 4009 } 4010 4011 } 4012 4013 void os::Solaris::install_signal_handlers() { 4014 signal_handlers_are_installed = true; 4015 4016 // signal-chaining 4017 typedef void (*signal_setting_t)(); 4018 signal_setting_t begin_signal_setting = NULL; 4019 signal_setting_t end_signal_setting = NULL; 4020 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4021 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 4022 if (begin_signal_setting != NULL) { 4023 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4024 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 4025 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 4026 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 4027 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t, 4028 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version")); 4029 libjsig_is_loaded = true; 4030 if (os::Solaris::get_libjsig_version != NULL) { 4031 int libjsigversion = (*os::Solaris::get_libjsig_version)(); 4032 assert(libjsigversion == JSIG_VERSION_1_4_1, "libjsig version mismatch"); 4033 } 4034 assert(UseSignalChaining, "should enable signal-chaining"); 4035 } 4036 if (libjsig_is_loaded) { 4037 // Tell libjsig jvm is setting signal handlers 4038 (*begin_signal_setting)(); 4039 } 4040 4041 set_signal_handler(SIGSEGV, true, true); 4042 set_signal_handler(SIGPIPE, true, true); 4043 set_signal_handler(SIGXFSZ, true, true); 4044 set_signal_handler(SIGBUS, true, true); 4045 set_signal_handler(SIGILL, true, true); 4046 set_signal_handler(SIGFPE, true, true); 4047 set_signal_handler(ASYNC_SIGNAL, true, true); 4048 4049 if (libjsig_is_loaded) { 4050 // Tell libjsig jvm finishes setting signal handlers 4051 (*end_signal_setting)(); 4052 } 4053 4054 // We don't activate signal checker if libjsig is in place, we trust ourselves 4055 // and if UserSignalHandler is installed all bets are off. 4056 // Log that signal checking is off only if -verbose:jni is specified. 4057 if (CheckJNICalls) { 4058 if (libjsig_is_loaded) { 4059 if (PrintJNIResolving) { 4060 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 4061 } 4062 check_signals = false; 4063 } 4064 if (AllowUserSignalHandlers) { 4065 if (PrintJNIResolving) { 4066 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4067 } 4068 check_signals = false; 4069 } 4070 } 4071 } 4072 4073 4074 void report_error(const char* file_name, int line_no, const char* title, 4075 const char* format, ...); 4076 4077 // (Static) wrappers for the liblgrp API 4078 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 4079 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 4080 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 4081 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 4082 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 4083 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 4084 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 4085 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 4086 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 4087 4088 static address resolve_symbol_lazy(const char* name) { 4089 address addr = (address) dlsym(RTLD_DEFAULT, name); 4090 if (addr == NULL) { 4091 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 4092 addr = (address) dlsym(RTLD_NEXT, name); 4093 } 4094 return addr; 4095 } 4096 4097 static address resolve_symbol(const char* name) { 4098 address addr = resolve_symbol_lazy(name); 4099 if (addr == NULL) { 4100 fatal(dlerror()); 4101 } 4102 return addr; 4103 } 4104 4105 void os::Solaris::libthread_init() { 4106 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 4107 4108 lwp_priocntl_init(); 4109 4110 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 4111 if (func == NULL) { 4112 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 4113 // Guarantee that this VM is running on an new enough OS (5.6 or 4114 // later) that it will have a new enough libthread.so. 4115 guarantee(func != NULL, "libthread.so is too old."); 4116 } 4117 4118 int size; 4119 void (*handler_info_func)(address *, int *); 4120 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 4121 handler_info_func(&handler_start, &size); 4122 handler_end = handler_start + size; 4123 } 4124 4125 4126 int_fnP_mutex_tP os::Solaris::_mutex_lock; 4127 int_fnP_mutex_tP os::Solaris::_mutex_trylock; 4128 int_fnP_mutex_tP os::Solaris::_mutex_unlock; 4129 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 4130 int_fnP_mutex_tP os::Solaris::_mutex_destroy; 4131 int os::Solaris::_mutex_scope = USYNC_THREAD; 4132 4133 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 4134 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 4135 int_fnP_cond_tP os::Solaris::_cond_signal; 4136 int_fnP_cond_tP os::Solaris::_cond_broadcast; 4137 int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 4138 int_fnP_cond_tP os::Solaris::_cond_destroy; 4139 int os::Solaris::_cond_scope = USYNC_THREAD; 4140 4141 void os::Solaris::synchronization_init() { 4142 if (UseLWPSynchronization) { 4143 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 4144 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 4145 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 4146 os::Solaris::set_mutex_init(lwp_mutex_init); 4147 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 4148 os::Solaris::set_mutex_scope(USYNC_THREAD); 4149 4150 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 4151 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 4152 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 4153 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 4154 os::Solaris::set_cond_init(lwp_cond_init); 4155 os::Solaris::set_cond_destroy(lwp_cond_destroy); 4156 os::Solaris::set_cond_scope(USYNC_THREAD); 4157 } else { 4158 os::Solaris::set_mutex_scope(USYNC_THREAD); 4159 os::Solaris::set_cond_scope(USYNC_THREAD); 4160 4161 if (UsePthreads) { 4162 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 4163 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 4164 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 4165 os::Solaris::set_mutex_init(pthread_mutex_default_init); 4166 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 4167 4168 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 4169 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 4170 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 4171 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 4172 os::Solaris::set_cond_init(pthread_cond_default_init); 4173 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 4174 } else { 4175 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 4176 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 4177 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 4178 os::Solaris::set_mutex_init(::mutex_init); 4179 os::Solaris::set_mutex_destroy(::mutex_destroy); 4180 4181 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 4182 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 4183 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 4184 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 4185 os::Solaris::set_cond_init(::cond_init); 4186 os::Solaris::set_cond_destroy(::cond_destroy); 4187 } 4188 } 4189 } 4190 4191 bool os::Solaris::liblgrp_init() { 4192 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 4193 if (handle != NULL) { 4194 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 4195 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 4196 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 4197 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 4198 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 4199 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 4200 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 4201 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 4202 dlsym(handle, "lgrp_cookie_stale"))); 4203 4204 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 4205 set_lgrp_cookie(c); 4206 return true; 4207 } 4208 return false; 4209 } 4210 4211 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 4212 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 4213 static pset_getloadavg_type pset_getloadavg_ptr = NULL; 4214 4215 void init_pset_getloadavg_ptr(void) { 4216 pset_getloadavg_ptr = 4217 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 4218 if (pset_getloadavg_ptr == NULL) { 4219 log_warning(os)("pset_getloadavg function not found"); 4220 } 4221 } 4222 4223 int os::Solaris::_dev_zero_fd = -1; 4224 4225 // this is called _before_ the global arguments have been parsed 4226 void os::init(void) { 4227 _initial_pid = getpid(); 4228 4229 max_hrtime = first_hrtime = gethrtime(); 4230 4231 init_random(1234567); 4232 4233 page_size = sysconf(_SC_PAGESIZE); 4234 if (page_size == -1) { 4235 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 4236 } 4237 init_page_sizes((size_t) page_size); 4238 4239 Solaris::initialize_system_info(); 4240 4241 int fd = ::open("/dev/zero", O_RDWR); 4242 if (fd < 0) { 4243 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno)); 4244 } else { 4245 Solaris::set_dev_zero_fd(fd); 4246 4247 // Close on exec, child won't inherit. 4248 fcntl(fd, F_SETFD, FD_CLOEXEC); 4249 } 4250 4251 clock_tics_per_sec = CLK_TCK; 4252 4253 // check if dladdr1() exists; dladdr1 can provide more information than 4254 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 4255 // and is available on linker patches for 5.7 and 5.8. 4256 // libdl.so must have been loaded, this call is just an entry lookup 4257 void * hdl = dlopen("libdl.so", RTLD_NOW); 4258 if (hdl) { 4259 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 4260 } 4261 4262 // (Solaris only) this switches to calls that actually do locking. 4263 ThreadCritical::initialize(); 4264 4265 main_thread = thr_self(); 4266 4267 // dynamic lookup of functions that may not be available in our lowest 4268 // supported Solaris release 4269 void * handle = dlopen("libc.so.1", RTLD_LAZY); 4270 if (handle != NULL) { 4271 Solaris::_pthread_setname_np = // from 11.3 4272 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np"); 4273 } 4274 } 4275 4276 // To install functions for atexit system call 4277 extern "C" { 4278 static void perfMemory_exit_helper() { 4279 perfMemory_exit(); 4280 } 4281 } 4282 4283 // this is called _after_ the global arguments have been parsed 4284 jint os::init_2(void) { 4285 // try to enable extended file IO ASAP, see 6431278 4286 os::Solaris::try_enable_extended_io(); 4287 4288 // Allocate a single page and mark it as readable for safepoint polling. Also 4289 // use this first mmap call to check support for MAP_ALIGN. 4290 address polling_page = (address)Solaris::mmap_chunk((char*)page_size, 4291 page_size, 4292 MAP_PRIVATE | MAP_ALIGN, 4293 PROT_READ); 4294 if (polling_page == NULL) { 4295 has_map_align = false; 4296 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, 4297 PROT_READ); 4298 } 4299 4300 os::set_polling_page(polling_page); 4301 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page)); 4302 4303 if (!UseMembar) { 4304 address mem_serialize_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE); 4305 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 4306 os::set_memory_serialize_page(mem_serialize_page); 4307 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page)); 4308 } 4309 4310 // Check and sets minimum stack sizes against command line options 4311 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 4312 return JNI_ERR; 4313 } 4314 4315 Solaris::libthread_init(); 4316 4317 if (UseNUMA) { 4318 if (!Solaris::liblgrp_init()) { 4319 UseNUMA = false; 4320 } else { 4321 size_t lgrp_limit = os::numa_get_groups_num(); 4322 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); 4323 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 4324 FREE_C_HEAP_ARRAY(int, lgrp_ids); 4325 if (lgrp_num < 2) { 4326 // There's only one locality group, disable NUMA. 4327 UseNUMA = false; 4328 } 4329 } 4330 if (!UseNUMA && ForceNUMA) { 4331 UseNUMA = true; 4332 } 4333 } 4334 4335 Solaris::signal_sets_init(); 4336 Solaris::init_signal_mem(); 4337 Solaris::install_signal_handlers(); 4338 4339 // initialize synchronization primitives to use either thread or 4340 // lwp synchronization (controlled by UseLWPSynchronization) 4341 Solaris::synchronization_init(); 4342 4343 if (MaxFDLimit) { 4344 // set the number of file descriptors to max. print out error 4345 // if getrlimit/setrlimit fails but continue regardless. 4346 struct rlimit nbr_files; 4347 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 4348 if (status != 0) { 4349 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 4350 } else { 4351 nbr_files.rlim_cur = nbr_files.rlim_max; 4352 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 4353 if (status != 0) { 4354 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 4355 } 4356 } 4357 } 4358 4359 // Calculate theoretical max. size of Threads to guard gainst 4360 // artifical out-of-memory situations, where all available address- 4361 // space has been reserved by thread stacks. Default stack size is 1Mb. 4362 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 4363 JavaThread::stack_size_at_create() : (1*K*K); 4364 assert(pre_thread_stack_size != 0, "Must have a stack"); 4365 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 4366 // we should start doing Virtual Memory banging. Currently when the threads will 4367 // have used all but 200Mb of space. 4368 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 4369 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 4370 4371 // at-exit methods are called in the reverse order of their registration. 4372 // In Solaris 7 and earlier, atexit functions are called on return from 4373 // main or as a result of a call to exit(3C). There can be only 32 of 4374 // these functions registered and atexit() does not set errno. In Solaris 4375 // 8 and later, there is no limit to the number of functions registered 4376 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 4377 // functions are called upon dlclose(3DL) in addition to return from main 4378 // and exit(3C). 4379 4380 if (PerfAllowAtExitRegistration) { 4381 // only register atexit functions if PerfAllowAtExitRegistration is set. 4382 // atexit functions can be delayed until process exit time, which 4383 // can be problematic for embedded VM situations. Embedded VMs should 4384 // call DestroyJavaVM() to assure that VM resources are released. 4385 4386 // note: perfMemory_exit_helper atexit function may be removed in 4387 // the future if the appropriate cleanup code can be added to the 4388 // VM_Exit VMOperation's doit method. 4389 if (atexit(perfMemory_exit_helper) != 0) { 4390 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 4391 } 4392 } 4393 4394 // Init pset_loadavg function pointer 4395 init_pset_getloadavg_ptr(); 4396 4397 return JNI_OK; 4398 } 4399 4400 // Mark the polling page as unreadable 4401 void os::make_polling_page_unreadable(void) { 4402 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) { 4403 fatal("Could not disable polling page"); 4404 } 4405 } 4406 4407 // Mark the polling page as readable 4408 void os::make_polling_page_readable(void) { 4409 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) { 4410 fatal("Could not enable polling page"); 4411 } 4412 } 4413 4414 // Is a (classpath) directory empty? 4415 bool os::dir_is_empty(const char* path) { 4416 DIR *dir = NULL; 4417 struct dirent *ptr; 4418 4419 dir = opendir(path); 4420 if (dir == NULL) return true; 4421 4422 // Scan the directory 4423 bool result = true; 4424 char buf[sizeof(struct dirent) + MAX_PATH]; 4425 struct dirent *dbuf = (struct dirent *) buf; 4426 while (result && (ptr = readdir(dir, dbuf)) != NULL) { 4427 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 4428 result = false; 4429 } 4430 } 4431 closedir(dir); 4432 return result; 4433 } 4434 4435 // This code originates from JDK's sysOpen and open64_w 4436 // from src/solaris/hpi/src/system_md.c 4437 4438 int os::open(const char *path, int oflag, int mode) { 4439 if (strlen(path) > MAX_PATH - 1) { 4440 errno = ENAMETOOLONG; 4441 return -1; 4442 } 4443 int fd; 4444 4445 fd = ::open64(path, oflag, mode); 4446 if (fd == -1) return -1; 4447 4448 // If the open succeeded, the file might still be a directory 4449 { 4450 struct stat64 buf64; 4451 int ret = ::fstat64(fd, &buf64); 4452 int st_mode = buf64.st_mode; 4453 4454 if (ret != -1) { 4455 if ((st_mode & S_IFMT) == S_IFDIR) { 4456 errno = EISDIR; 4457 ::close(fd); 4458 return -1; 4459 } 4460 } else { 4461 ::close(fd); 4462 return -1; 4463 } 4464 } 4465 4466 // 32-bit Solaris systems suffer from: 4467 // 4468 // - an historical default soft limit of 256 per-process file 4469 // descriptors that is too low for many Java programs. 4470 // 4471 // - a design flaw where file descriptors created using stdio 4472 // fopen must be less than 256, _even_ when the first limit above 4473 // has been raised. This can cause calls to fopen (but not calls to 4474 // open, for example) to fail mysteriously, perhaps in 3rd party 4475 // native code (although the JDK itself uses fopen). One can hardly 4476 // criticize them for using this most standard of all functions. 4477 // 4478 // We attempt to make everything work anyways by: 4479 // 4480 // - raising the soft limit on per-process file descriptors beyond 4481 // 256 4482 // 4483 // - As of Solaris 10u4, we can request that Solaris raise the 256 4484 // stdio fopen limit by calling function enable_extended_FILE_stdio. 4485 // This is done in init_2 and recorded in enabled_extended_FILE_stdio 4486 // 4487 // - If we are stuck on an old (pre 10u4) Solaris system, we can 4488 // workaround the bug by remapping non-stdio file descriptors below 4489 // 256 to ones beyond 256, which is done below. 4490 // 4491 // See: 4492 // 1085341: 32-bit stdio routines should support file descriptors >255 4493 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files 4494 // 6431278: Netbeans crash on 32 bit Solaris: need to call 4495 // enable_extended_FILE_stdio() in VM initialisation 4496 // Giri Mandalika's blog 4497 // http://technopark02.blogspot.com/2005_05_01_archive.html 4498 // 4499 #ifndef _LP64 4500 if ((!enabled_extended_FILE_stdio) && fd < 256) { 4501 int newfd = ::fcntl(fd, F_DUPFD, 256); 4502 if (newfd != -1) { 4503 ::close(fd); 4504 fd = newfd; 4505 } 4506 } 4507 #endif // 32-bit Solaris 4508 4509 // All file descriptors that are opened in the JVM and not 4510 // specifically destined for a subprocess should have the 4511 // close-on-exec flag set. If we don't set it, then careless 3rd 4512 // party native code might fork and exec without closing all 4513 // appropriate file descriptors (e.g. as we do in closeDescriptors in 4514 // UNIXProcess.c), and this in turn might: 4515 // 4516 // - cause end-of-file to fail to be detected on some file 4517 // descriptors, resulting in mysterious hangs, or 4518 // 4519 // - might cause an fopen in the subprocess to fail on a system 4520 // suffering from bug 1085341. 4521 // 4522 // (Yes, the default setting of the close-on-exec flag is a Unix 4523 // design flaw) 4524 // 4525 // See: 4526 // 1085341: 32-bit stdio routines should support file descriptors >255 4527 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 4528 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 4529 // 4530 #ifdef FD_CLOEXEC 4531 { 4532 int flags = ::fcntl(fd, F_GETFD); 4533 if (flags != -1) { 4534 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 4535 } 4536 } 4537 #endif 4538 4539 return fd; 4540 } 4541 4542 // create binary file, rewriting existing file if required 4543 int os::create_binary_file(const char* path, bool rewrite_existing) { 4544 int oflags = O_WRONLY | O_CREAT; 4545 if (!rewrite_existing) { 4546 oflags |= O_EXCL; 4547 } 4548 return ::open64(path, oflags, S_IREAD | S_IWRITE); 4549 } 4550 4551 // return current position of file pointer 4552 jlong os::current_file_offset(int fd) { 4553 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 4554 } 4555 4556 // move file pointer to the specified offset 4557 jlong os::seek_to_file_offset(int fd, jlong offset) { 4558 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 4559 } 4560 4561 jlong os::lseek(int fd, jlong offset, int whence) { 4562 return (jlong) ::lseek64(fd, offset, whence); 4563 } 4564 4565 char * os::native_path(char *path) { 4566 return path; 4567 } 4568 4569 int os::ftruncate(int fd, jlong length) { 4570 return ::ftruncate64(fd, length); 4571 } 4572 4573 int os::fsync(int fd) { 4574 RESTARTABLE_RETURN_INT(::fsync(fd)); 4575 } 4576 4577 int os::available(int fd, jlong *bytes) { 4578 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 4579 "Assumed _thread_in_native"); 4580 jlong cur, end; 4581 int mode; 4582 struct stat64 buf64; 4583 4584 if (::fstat64(fd, &buf64) >= 0) { 4585 mode = buf64.st_mode; 4586 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 4587 int n,ioctl_return; 4588 4589 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return); 4590 if (ioctl_return>= 0) { 4591 *bytes = n; 4592 return 1; 4593 } 4594 } 4595 } 4596 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 4597 return 0; 4598 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 4599 return 0; 4600 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 4601 return 0; 4602 } 4603 *bytes = end - cur; 4604 return 1; 4605 } 4606 4607 // Map a block of memory. 4608 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4609 char *addr, size_t bytes, bool read_only, 4610 bool allow_exec) { 4611 int prot; 4612 int flags; 4613 4614 if (read_only) { 4615 prot = PROT_READ; 4616 flags = MAP_SHARED; 4617 } else { 4618 prot = PROT_READ | PROT_WRITE; 4619 flags = MAP_PRIVATE; 4620 } 4621 4622 if (allow_exec) { 4623 prot |= PROT_EXEC; 4624 } 4625 4626 if (addr != NULL) { 4627 flags |= MAP_FIXED; 4628 } 4629 4630 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 4631 fd, file_offset); 4632 if (mapped_address == MAP_FAILED) { 4633 return NULL; 4634 } 4635 return mapped_address; 4636 } 4637 4638 4639 // Remap a block of memory. 4640 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4641 char *addr, size_t bytes, bool read_only, 4642 bool allow_exec) { 4643 // same as map_memory() on this OS 4644 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4645 allow_exec); 4646 } 4647 4648 4649 // Unmap a block of memory. 4650 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4651 return munmap(addr, bytes) == 0; 4652 } 4653 4654 void os::pause() { 4655 char filename[MAX_PATH]; 4656 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4657 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4658 } else { 4659 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4660 } 4661 4662 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4663 if (fd != -1) { 4664 struct stat buf; 4665 ::close(fd); 4666 while (::stat(filename, &buf) == 0) { 4667 (void)::poll(NULL, 0, 100); 4668 } 4669 } else { 4670 jio_fprintf(stderr, 4671 "Could not open pause file '%s', continuing immediately.\n", filename); 4672 } 4673 } 4674 4675 #ifndef PRODUCT 4676 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4677 // Turn this on if you need to trace synch operations. 4678 // Set RECORD_SYNCH_LIMIT to a large-enough value, 4679 // and call record_synch_enable and record_synch_disable 4680 // around the computation of interest. 4681 4682 void record_synch(char* name, bool returning); // defined below 4683 4684 class RecordSynch { 4685 char* _name; 4686 public: 4687 RecordSynch(char* name) :_name(name) { record_synch(_name, false); } 4688 ~RecordSynch() { record_synch(_name, true); } 4689 }; 4690 4691 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 4692 extern "C" ret name params { \ 4693 typedef ret name##_t params; \ 4694 static name##_t* implem = NULL; \ 4695 static int callcount = 0; \ 4696 if (implem == NULL) { \ 4697 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 4698 if (implem == NULL) fatal(dlerror()); \ 4699 } \ 4700 ++callcount; \ 4701 RecordSynch _rs(#name); \ 4702 inner; \ 4703 return implem args; \ 4704 } 4705 // in dbx, examine callcounts this way: 4706 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 4707 4708 #define CHECK_POINTER_OK(p) \ 4709 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) 4710 #define CHECK_MU \ 4711 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 4712 #define CHECK_CV \ 4713 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 4714 #define CHECK_P(p) \ 4715 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 4716 4717 #define CHECK_MUTEX(mutex_op) \ 4718 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 4719 4720 CHECK_MUTEX( mutex_lock) 4721 CHECK_MUTEX( _mutex_lock) 4722 CHECK_MUTEX( mutex_unlock) 4723 CHECK_MUTEX(_mutex_unlock) 4724 CHECK_MUTEX( mutex_trylock) 4725 CHECK_MUTEX(_mutex_trylock) 4726 4727 #define CHECK_COND(cond_op) \ 4728 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV); 4729 4730 CHECK_COND( cond_wait); 4731 CHECK_COND(_cond_wait); 4732 CHECK_COND(_cond_wait_cancel); 4733 4734 #define CHECK_COND2(cond_op) \ 4735 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV); 4736 4737 CHECK_COND2( cond_timedwait); 4738 CHECK_COND2(_cond_timedwait); 4739 CHECK_COND2(_cond_timedwait_cancel); 4740 4741 // do the _lwp_* versions too 4742 #define mutex_t lwp_mutex_t 4743 #define cond_t lwp_cond_t 4744 CHECK_MUTEX( _lwp_mutex_lock) 4745 CHECK_MUTEX( _lwp_mutex_unlock) 4746 CHECK_MUTEX( _lwp_mutex_trylock) 4747 CHECK_MUTEX( __lwp_mutex_lock) 4748 CHECK_MUTEX( __lwp_mutex_unlock) 4749 CHECK_MUTEX( __lwp_mutex_trylock) 4750 CHECK_MUTEX(___lwp_mutex_lock) 4751 CHECK_MUTEX(___lwp_mutex_unlock) 4752 4753 CHECK_COND( _lwp_cond_wait); 4754 CHECK_COND( __lwp_cond_wait); 4755 CHECK_COND(___lwp_cond_wait); 4756 4757 CHECK_COND2( _lwp_cond_timedwait); 4758 CHECK_COND2( __lwp_cond_timedwait); 4759 #undef mutex_t 4760 #undef cond_t 4761 4762 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4763 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4764 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 4765 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 4766 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4767 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4768 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4769 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4770 4771 4772 // recording machinery: 4773 4774 enum { RECORD_SYNCH_LIMIT = 200 }; 4775 char* record_synch_name[RECORD_SYNCH_LIMIT]; 4776 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 4777 bool record_synch_returning[RECORD_SYNCH_LIMIT]; 4778 thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 4779 int record_synch_count = 0; 4780 bool record_synch_enabled = false; 4781 4782 // in dbx, examine recorded data this way: 4783 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 4784 4785 void record_synch(char* name, bool returning) { 4786 if (record_synch_enabled) { 4787 if (record_synch_count < RECORD_SYNCH_LIMIT) { 4788 record_synch_name[record_synch_count] = name; 4789 record_synch_returning[record_synch_count] = returning; 4790 record_synch_thread[record_synch_count] = thr_self(); 4791 record_synch_arg0ptr[record_synch_count] = &name; 4792 record_synch_count++; 4793 } 4794 // put more checking code here: 4795 // ... 4796 } 4797 } 4798 4799 void record_synch_enable() { 4800 // start collecting trace data, if not already doing so 4801 if (!record_synch_enabled) record_synch_count = 0; 4802 record_synch_enabled = true; 4803 } 4804 4805 void record_synch_disable() { 4806 // stop collecting trace data 4807 record_synch_enabled = false; 4808 } 4809 4810 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4811 #endif // PRODUCT 4812 4813 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4814 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 4815 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4816 4817 4818 // JVMTI & JVM monitoring and management support 4819 // The thread_cpu_time() and current_thread_cpu_time() are only 4820 // supported if is_thread_cpu_time_supported() returns true. 4821 // They are not supported on Solaris T1. 4822 4823 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4824 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4825 // of a thread. 4826 // 4827 // current_thread_cpu_time() and thread_cpu_time(Thread *) 4828 // returns the fast estimate available on the platform. 4829 4830 // hrtime_t gethrvtime() return value includes 4831 // user time but does not include system time 4832 jlong os::current_thread_cpu_time() { 4833 return (jlong) gethrvtime(); 4834 } 4835 4836 jlong os::thread_cpu_time(Thread *thread) { 4837 // return user level CPU time only to be consistent with 4838 // what current_thread_cpu_time returns. 4839 // thread_cpu_time_info() must be changed if this changes 4840 return os::thread_cpu_time(thread, false /* user time only */); 4841 } 4842 4843 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4844 if (user_sys_cpu_time) { 4845 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4846 } else { 4847 return os::current_thread_cpu_time(); 4848 } 4849 } 4850 4851 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 4852 char proc_name[64]; 4853 int count; 4854 prusage_t prusage; 4855 jlong lwp_time; 4856 int fd; 4857 4858 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 4859 getpid(), 4860 thread->osthread()->lwp_id()); 4861 fd = ::open(proc_name, O_RDONLY); 4862 if (fd == -1) return -1; 4863 4864 do { 4865 count = ::pread(fd, 4866 (void *)&prusage.pr_utime, 4867 thr_time_size, 4868 thr_time_off); 4869 } while (count < 0 && errno == EINTR); 4870 ::close(fd); 4871 if (count < 0) return -1; 4872 4873 if (user_sys_cpu_time) { 4874 // user + system CPU time 4875 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 4876 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 4877 (jlong)prusage.pr_stime.tv_nsec + 4878 (jlong)prusage.pr_utime.tv_nsec; 4879 } else { 4880 // user level CPU time only 4881 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 4882 (jlong)prusage.pr_utime.tv_nsec; 4883 } 4884 4885 return (lwp_time); 4886 } 4887 4888 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4889 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4890 info_ptr->may_skip_backward = false; // elapsed time not wall time 4891 info_ptr->may_skip_forward = false; // elapsed time not wall time 4892 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4893 } 4894 4895 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4896 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4897 info_ptr->may_skip_backward = false; // elapsed time not wall time 4898 info_ptr->may_skip_forward = false; // elapsed time not wall time 4899 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4900 } 4901 4902 bool os::is_thread_cpu_time_supported() { 4903 return true; 4904 } 4905 4906 // System loadavg support. Returns -1 if load average cannot be obtained. 4907 // Return the load average for our processor set if the primitive exists 4908 // (Solaris 9 and later). Otherwise just return system wide loadavg. 4909 int os::loadavg(double loadavg[], int nelem) { 4910 if (pset_getloadavg_ptr != NULL) { 4911 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 4912 } else { 4913 return ::getloadavg(loadavg, nelem); 4914 } 4915 } 4916 4917 //--------------------------------------------------------------------------------- 4918 4919 bool os::find(address addr, outputStream* st) { 4920 Dl_info dlinfo; 4921 memset(&dlinfo, 0, sizeof(dlinfo)); 4922 if (dladdr(addr, &dlinfo) != 0) { 4923 st->print(PTR_FORMAT ": ", addr); 4924 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 4925 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 4926 } else if (dlinfo.dli_fbase != NULL) { 4927 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 4928 } else { 4929 st->print("<absolute address>"); 4930 } 4931 if (dlinfo.dli_fname != NULL) { 4932 st->print(" in %s", dlinfo.dli_fname); 4933 } 4934 if (dlinfo.dli_fbase != NULL) { 4935 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 4936 } 4937 st->cr(); 4938 4939 if (Verbose) { 4940 // decode some bytes around the PC 4941 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 4942 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 4943 address lowest = (address) dlinfo.dli_sname; 4944 if (!lowest) lowest = (address) dlinfo.dli_fbase; 4945 if (begin < lowest) begin = lowest; 4946 Dl_info dlinfo2; 4947 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 4948 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 4949 end = (address) dlinfo2.dli_saddr; 4950 } 4951 Disassembler::decode(begin, end, st); 4952 } 4953 return true; 4954 } 4955 return false; 4956 } 4957 4958 // Following function has been added to support HotSparc's libjvm.so running 4959 // under Solaris production JDK 1.2.2 / 1.3.0. These came from 4960 // src/solaris/hpi/native_threads in the EVM codebase. 4961 // 4962 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 4963 // libraries and should thus be removed. We will leave it behind for a while 4964 // until we no longer want to able to run on top of 1.3.0 Solaris production 4965 // JDK. See 4341971. 4966 4967 #define STACK_SLACK 0x800 4968 4969 extern "C" { 4970 intptr_t sysThreadAvailableStackWithSlack() { 4971 stack_t st; 4972 intptr_t retval, stack_top; 4973 retval = thr_stksegment(&st); 4974 assert(retval == 0, "incorrect return value from thr_stksegment"); 4975 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 4976 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 4977 stack_top=(intptr_t)st.ss_sp-st.ss_size; 4978 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 4979 } 4980 } 4981 4982 // ObjectMonitor park-unpark infrastructure ... 4983 // 4984 // We implement Solaris and Linux PlatformEvents with the 4985 // obvious condvar-mutex-flag triple. 4986 // Another alternative that works quite well is pipes: 4987 // Each PlatformEvent consists of a pipe-pair. 4988 // The thread associated with the PlatformEvent 4989 // calls park(), which reads from the input end of the pipe. 4990 // Unpark() writes into the other end of the pipe. 4991 // The write-side of the pipe must be set NDELAY. 4992 // Unfortunately pipes consume a large # of handles. 4993 // Native solaris lwp_park() and lwp_unpark() work nicely, too. 4994 // Using pipes for the 1st few threads might be workable, however. 4995 // 4996 // park() is permitted to return spuriously. 4997 // Callers of park() should wrap the call to park() in 4998 // an appropriate loop. A litmus test for the correct 4999 // usage of park is the following: if park() were modified 5000 // to immediately return 0 your code should still work, 5001 // albeit degenerating to a spin loop. 5002 // 5003 // In a sense, park()-unpark() just provides more polite spinning 5004 // and polling with the key difference over naive spinning being 5005 // that a parked thread needs to be explicitly unparked() in order 5006 // to wake up and to poll the underlying condition. 5007 // 5008 // Assumption: 5009 // Only one parker can exist on an event, which is why we allocate 5010 // them per-thread. Multiple unparkers can coexist. 5011 // 5012 // _Event transitions in park() 5013 // -1 => -1 : illegal 5014 // 1 => 0 : pass - return immediately 5015 // 0 => -1 : block; then set _Event to 0 before returning 5016 // 5017 // _Event transitions in unpark() 5018 // 0 => 1 : just return 5019 // 1 => 1 : just return 5020 // -1 => either 0 or 1; must signal target thread 5021 // That is, we can safely transition _Event from -1 to either 5022 // 0 or 1. 5023 // 5024 // _Event serves as a restricted-range semaphore. 5025 // -1 : thread is blocked, i.e. there is a waiter 5026 // 0 : neutral: thread is running or ready, 5027 // could have been signaled after a wait started 5028 // 1 : signaled - thread is running or ready 5029 // 5030 // Another possible encoding of _Event would be with 5031 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5032 // 5033 // TODO-FIXME: add DTRACE probes for: 5034 // 1. Tx parks 5035 // 2. Ty unparks Tx 5036 // 3. Tx resumes from park 5037 5038 5039 // value determined through experimentation 5040 #define ROUNDINGFIX 11 5041 5042 // utility to compute the abstime argument to timedwait. 5043 // TODO-FIXME: switch from compute_abstime() to unpackTime(). 5044 5045 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 5046 // millis is the relative timeout time 5047 // abstime will be the absolute timeout time 5048 if (millis < 0) millis = 0; 5049 struct timeval now; 5050 int status = gettimeofday(&now, NULL); 5051 assert(status == 0, "gettimeofday"); 5052 jlong seconds = millis / 1000; 5053 jlong max_wait_period; 5054 5055 if (UseLWPSynchronization) { 5056 // forward port of fix for 4275818 (not sleeping long enough) 5057 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 5058 // _lwp_cond_timedwait() used a round_down algorithm rather 5059 // than a round_up. For millis less than our roundfactor 5060 // it rounded down to 0 which doesn't meet the spec. 5061 // For millis > roundfactor we may return a bit sooner, but 5062 // since we can not accurately identify the patch level and 5063 // this has already been fixed in Solaris 9 and 8 we will 5064 // leave it alone rather than always rounding down. 5065 5066 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 5067 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 5068 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 5069 max_wait_period = 21000000; 5070 } else { 5071 max_wait_period = 50000000; 5072 } 5073 millis %= 1000; 5074 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 5075 seconds = max_wait_period; 5076 } 5077 abstime->tv_sec = now.tv_sec + seconds; 5078 long usec = now.tv_usec + millis * 1000; 5079 if (usec >= 1000000) { 5080 abstime->tv_sec += 1; 5081 usec -= 1000000; 5082 } 5083 abstime->tv_nsec = usec * 1000; 5084 return abstime; 5085 } 5086 5087 void os::PlatformEvent::park() { // AKA: down() 5088 // Transitions for _Event: 5089 // -1 => -1 : illegal 5090 // 1 => 0 : pass - return immediately 5091 // 0 => -1 : block; then set _Event to 0 before returning 5092 5093 // Invariant: Only the thread associated with the Event/PlatformEvent 5094 // may call park(). 5095 assert(_nParked == 0, "invariant"); 5096 5097 int v; 5098 for (;;) { 5099 v = _Event; 5100 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5101 } 5102 guarantee(v >= 0, "invariant"); 5103 if (v == 0) { 5104 // Do this the hard way by blocking ... 5105 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5106 int status = os::Solaris::mutex_lock(_mutex); 5107 assert_status(status == 0, status, "mutex_lock"); 5108 guarantee(_nParked == 0, "invariant"); 5109 ++_nParked; 5110 while (_Event < 0) { 5111 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 5112 // Treat this the same as if the wait was interrupted 5113 // With usr/lib/lwp going to kernel, always handle ETIME 5114 status = os::Solaris::cond_wait(_cond, _mutex); 5115 if (status == ETIME) status = EINTR; 5116 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 5117 } 5118 --_nParked; 5119 _Event = 0; 5120 status = os::Solaris::mutex_unlock(_mutex); 5121 assert_status(status == 0, status, "mutex_unlock"); 5122 // Paranoia to ensure our locked and lock-free paths interact 5123 // correctly with each other. 5124 OrderAccess::fence(); 5125 } 5126 } 5127 5128 int os::PlatformEvent::park(jlong millis) { 5129 // Transitions for _Event: 5130 // -1 => -1 : illegal 5131 // 1 => 0 : pass - return immediately 5132 // 0 => -1 : block; then set _Event to 0 before returning 5133 5134 guarantee(_nParked == 0, "invariant"); 5135 int v; 5136 for (;;) { 5137 v = _Event; 5138 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5139 } 5140 guarantee(v >= 0, "invariant"); 5141 if (v != 0) return OS_OK; 5142 5143 int ret = OS_TIMEOUT; 5144 timestruc_t abst; 5145 compute_abstime(&abst, millis); 5146 5147 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5148 int status = os::Solaris::mutex_lock(_mutex); 5149 assert_status(status == 0, status, "mutex_lock"); 5150 guarantee(_nParked == 0, "invariant"); 5151 ++_nParked; 5152 while (_Event < 0) { 5153 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 5154 assert_status(status == 0 || status == EINTR || 5155 status == ETIME || status == ETIMEDOUT, 5156 status, "cond_timedwait"); 5157 if (!FilterSpuriousWakeups) break; // previous semantics 5158 if (status == ETIME || status == ETIMEDOUT) break; 5159 // We consume and ignore EINTR and spurious wakeups. 5160 } 5161 --_nParked; 5162 if (_Event >= 0) ret = OS_OK; 5163 _Event = 0; 5164 status = os::Solaris::mutex_unlock(_mutex); 5165 assert_status(status == 0, status, "mutex_unlock"); 5166 // Paranoia to ensure our locked and lock-free paths interact 5167 // correctly with each other. 5168 OrderAccess::fence(); 5169 return ret; 5170 } 5171 5172 void os::PlatformEvent::unpark() { 5173 // Transitions for _Event: 5174 // 0 => 1 : just return 5175 // 1 => 1 : just return 5176 // -1 => either 0 or 1; must signal target thread 5177 // That is, we can safely transition _Event from -1 to either 5178 // 0 or 1. 5179 // See also: "Semaphores in Plan 9" by Mullender & Cox 5180 // 5181 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5182 // that it will take two back-to-back park() calls for the owning 5183 // thread to block. This has the benefit of forcing a spurious return 5184 // from the first park() call after an unpark() call which will help 5185 // shake out uses of park() and unpark() without condition variables. 5186 5187 if (Atomic::xchg(1, &_Event) >= 0) return; 5188 5189 // If the thread associated with the event was parked, wake it. 5190 // Wait for the thread assoc with the PlatformEvent to vacate. 5191 int status = os::Solaris::mutex_lock(_mutex); 5192 assert_status(status == 0, status, "mutex_lock"); 5193 int AnyWaiters = _nParked; 5194 status = os::Solaris::mutex_unlock(_mutex); 5195 assert_status(status == 0, status, "mutex_unlock"); 5196 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 5197 if (AnyWaiters != 0) { 5198 // Note that we signal() *after* dropping the lock for "immortal" Events. 5199 // This is safe and avoids a common class of futile wakeups. In rare 5200 // circumstances this can cause a thread to return prematurely from 5201 // cond_{timed}wait() but the spurious wakeup is benign and the victim 5202 // will simply re-test the condition and re-park itself. 5203 // This provides particular benefit if the underlying platform does not 5204 // provide wait morphing. 5205 status = os::Solaris::cond_signal(_cond); 5206 assert_status(status == 0, status, "cond_signal"); 5207 } 5208 } 5209 5210 // JSR166 5211 // ------------------------------------------------------- 5212 5213 // The solaris and linux implementations of park/unpark are fairly 5214 // conservative for now, but can be improved. They currently use a 5215 // mutex/condvar pair, plus _counter. 5216 // Park decrements _counter if > 0, else does a condvar wait. Unpark 5217 // sets count to 1 and signals condvar. Only one thread ever waits 5218 // on the condvar. Contention seen when trying to park implies that someone 5219 // is unparking you, so don't wait. And spurious returns are fine, so there 5220 // is no need to track notifications. 5221 5222 #define MAX_SECS 100000000 5223 5224 // This code is common to linux and solaris and will be moved to a 5225 // common place in dolphin. 5226 // 5227 // The passed in time value is either a relative time in nanoseconds 5228 // or an absolute time in milliseconds. Either way it has to be unpacked 5229 // into suitable seconds and nanoseconds components and stored in the 5230 // given timespec structure. 5231 // Given time is a 64-bit value and the time_t used in the timespec is only 5232 // a signed-32-bit value (except on 64-bit Linux) we have to watch for 5233 // overflow if times way in the future are given. Further on Solaris versions 5234 // prior to 10 there is a restriction (see cond_timedwait) that the specified 5235 // number of seconds, in abstime, is less than current_time + 100,000,000. 5236 // As it will be 28 years before "now + 100000000" will overflow we can 5237 // ignore overflow and just impose a hard-limit on seconds using the value 5238 // of "now + 100,000,000". This places a limit on the timeout of about 3.17 5239 // years from "now". 5240 // 5241 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 5242 assert(time > 0, "convertTime"); 5243 5244 struct timeval now; 5245 int status = gettimeofday(&now, NULL); 5246 assert(status == 0, "gettimeofday"); 5247 5248 time_t max_secs = now.tv_sec + MAX_SECS; 5249 5250 if (isAbsolute) { 5251 jlong secs = time / 1000; 5252 if (secs > max_secs) { 5253 absTime->tv_sec = max_secs; 5254 } else { 5255 absTime->tv_sec = secs; 5256 } 5257 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 5258 } else { 5259 jlong secs = time / NANOSECS_PER_SEC; 5260 if (secs >= MAX_SECS) { 5261 absTime->tv_sec = max_secs; 5262 absTime->tv_nsec = 0; 5263 } else { 5264 absTime->tv_sec = now.tv_sec + secs; 5265 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 5266 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 5267 absTime->tv_nsec -= NANOSECS_PER_SEC; 5268 ++absTime->tv_sec; // note: this must be <= max_secs 5269 } 5270 } 5271 } 5272 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 5273 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 5274 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 5275 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 5276 } 5277 5278 void Parker::park(bool isAbsolute, jlong time) { 5279 // Ideally we'd do something useful while spinning, such 5280 // as calling unpackTime(). 5281 5282 // Optional fast-path check: 5283 // Return immediately if a permit is available. 5284 // We depend on Atomic::xchg() having full barrier semantics 5285 // since we are doing a lock-free update to _counter. 5286 if (Atomic::xchg(0, &_counter) > 0) return; 5287 5288 // Optional fast-exit: Check interrupt before trying to wait 5289 Thread* thread = Thread::current(); 5290 assert(thread->is_Java_thread(), "Must be JavaThread"); 5291 JavaThread *jt = (JavaThread *)thread; 5292 if (Thread::is_interrupted(thread, false)) { 5293 return; 5294 } 5295 5296 // First, demultiplex/decode time arguments 5297 timespec absTime; 5298 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all 5299 return; 5300 } 5301 if (time > 0) { 5302 // Warning: this code might be exposed to the old Solaris time 5303 // round-down bugs. Grep "roundingFix" for details. 5304 unpackTime(&absTime, isAbsolute, time); 5305 } 5306 5307 // Enter safepoint region 5308 // Beware of deadlocks such as 6317397. 5309 // The per-thread Parker:: _mutex is a classic leaf-lock. 5310 // In particular a thread must never block on the Threads_lock while 5311 // holding the Parker:: mutex. If safepoints are pending both the 5312 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 5313 ThreadBlockInVM tbivm(jt); 5314 5315 // Don't wait if cannot get lock since interference arises from 5316 // unblocking. Also. check interrupt before trying wait 5317 if (Thread::is_interrupted(thread, false) || 5318 os::Solaris::mutex_trylock(_mutex) != 0) { 5319 return; 5320 } 5321 5322 int status; 5323 5324 if (_counter > 0) { // no wait needed 5325 _counter = 0; 5326 status = os::Solaris::mutex_unlock(_mutex); 5327 assert(status == 0, "invariant"); 5328 // Paranoia to ensure our locked and lock-free paths interact 5329 // correctly with each other and Java-level accesses. 5330 OrderAccess::fence(); 5331 return; 5332 } 5333 5334 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5335 jt->set_suspend_equivalent(); 5336 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 5337 5338 // Do this the hard way by blocking ... 5339 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5340 if (time == 0) { 5341 status = os::Solaris::cond_wait(_cond, _mutex); 5342 } else { 5343 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 5344 } 5345 // Note that an untimed cond_wait() can sometimes return ETIME on older 5346 // versions of the Solaris. 5347 assert_status(status == 0 || status == EINTR || 5348 status == ETIME || status == ETIMEDOUT, 5349 status, "cond_timedwait"); 5350 5351 _counter = 0; 5352 status = os::Solaris::mutex_unlock(_mutex); 5353 assert_status(status == 0, status, "mutex_unlock"); 5354 // Paranoia to ensure our locked and lock-free paths interact 5355 // correctly with each other and Java-level accesses. 5356 OrderAccess::fence(); 5357 5358 // If externally suspended while waiting, re-suspend 5359 if (jt->handle_special_suspend_equivalent_condition()) { 5360 jt->java_suspend_self(); 5361 } 5362 } 5363 5364 void Parker::unpark() { 5365 int status = os::Solaris::mutex_lock(_mutex); 5366 assert(status == 0, "invariant"); 5367 const int s = _counter; 5368 _counter = 1; 5369 status = os::Solaris::mutex_unlock(_mutex); 5370 assert(status == 0, "invariant"); 5371 5372 if (s < 1) { 5373 status = os::Solaris::cond_signal(_cond); 5374 assert(status == 0, "invariant"); 5375 } 5376 } 5377 5378 extern char** environ; 5379 5380 // Run the specified command in a separate process. Return its exit value, 5381 // or -1 on failure (e.g. can't fork a new process). 5382 // Unlike system(), this function can be called from signal handler. It 5383 // doesn't block SIGINT et al. 5384 int os::fork_and_exec(char* cmd) { 5385 char * argv[4]; 5386 argv[0] = (char *)"sh"; 5387 argv[1] = (char *)"-c"; 5388 argv[2] = cmd; 5389 argv[3] = NULL; 5390 5391 // fork is async-safe, fork1 is not so can't use in signal handler 5392 pid_t pid; 5393 Thread* t = Thread::current_or_null_safe(); 5394 if (t != NULL && t->is_inside_signal_handler()) { 5395 pid = fork(); 5396 } else { 5397 pid = fork1(); 5398 } 5399 5400 if (pid < 0) { 5401 // fork failed 5402 warning("fork failed: %s", os::strerror(errno)); 5403 return -1; 5404 5405 } else if (pid == 0) { 5406 // child process 5407 5408 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 5409 execve("/usr/bin/sh", argv, environ); 5410 5411 // execve failed 5412 _exit(-1); 5413 5414 } else { 5415 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5416 // care about the actual exit code, for now. 5417 5418 int status; 5419 5420 // Wait for the child process to exit. This returns immediately if 5421 // the child has already exited. */ 5422 while (waitpid(pid, &status, 0) < 0) { 5423 switch (errno) { 5424 case ECHILD: return 0; 5425 case EINTR: break; 5426 default: return -1; 5427 } 5428 } 5429 5430 if (WIFEXITED(status)) { 5431 // The child exited normally; get its exit code. 5432 return WEXITSTATUS(status); 5433 } else if (WIFSIGNALED(status)) { 5434 // The child exited because of a signal 5435 // The best value to return is 0x80 + signal number, 5436 // because that is what all Unix shells do, and because 5437 // it allows callers to distinguish between process exit and 5438 // process death by signal. 5439 return 0x80 + WTERMSIG(status); 5440 } else { 5441 // Unknown exit code; pass it through 5442 return status; 5443 } 5444 } 5445 } 5446 5447 // is_headless_jre() 5448 // 5449 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 5450 // in order to report if we are running in a headless jre 5451 // 5452 // Since JDK8 xawt/libmawt.so was moved into the same directory 5453 // as libawt.so, and renamed libawt_xawt.so 5454 // 5455 bool os::is_headless_jre() { 5456 struct stat statbuf; 5457 char buf[MAXPATHLEN]; 5458 char libmawtpath[MAXPATHLEN]; 5459 const char *xawtstr = "/xawt/libmawt.so"; 5460 const char *new_xawtstr = "/libawt_xawt.so"; 5461 char *p; 5462 5463 // Get path to libjvm.so 5464 os::jvm_path(buf, sizeof(buf)); 5465 5466 // Get rid of libjvm.so 5467 p = strrchr(buf, '/'); 5468 if (p == NULL) { 5469 return false; 5470 } else { 5471 *p = '\0'; 5472 } 5473 5474 // Get rid of client or server 5475 p = strrchr(buf, '/'); 5476 if (p == NULL) { 5477 return false; 5478 } else { 5479 *p = '\0'; 5480 } 5481 5482 // check xawt/libmawt.so 5483 strcpy(libmawtpath, buf); 5484 strcat(libmawtpath, xawtstr); 5485 if (::stat(libmawtpath, &statbuf) == 0) return false; 5486 5487 // check libawt_xawt.so 5488 strcpy(libmawtpath, buf); 5489 strcat(libmawtpath, new_xawtstr); 5490 if (::stat(libmawtpath, &statbuf) == 0) return false; 5491 5492 return true; 5493 } 5494 5495 size_t os::write(int fd, const void *buf, unsigned int nBytes) { 5496 size_t res; 5497 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res); 5498 return res; 5499 } 5500 5501 int os::close(int fd) { 5502 return ::close(fd); 5503 } 5504 5505 int os::socket_close(int fd) { 5506 return ::close(fd); 5507 } 5508 5509 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5510 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5511 "Assumed _thread_in_native"); 5512 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags)); 5513 } 5514 5515 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5516 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5517 "Assumed _thread_in_native"); 5518 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5519 } 5520 5521 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5522 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5523 } 5524 5525 // As both poll and select can be interrupted by signals, we have to be 5526 // prepared to restart the system call after updating the timeout, unless 5527 // a poll() is done with timeout == -1, in which case we repeat with this 5528 // "wait forever" value. 5529 5530 int os::connect(int fd, struct sockaddr *him, socklen_t len) { 5531 int _result; 5532 _result = ::connect(fd, him, len); 5533 5534 // On Solaris, when a connect() call is interrupted, the connection 5535 // can be established asynchronously (see 6343810). Subsequent calls 5536 // to connect() must check the errno value which has the semantic 5537 // described below (copied from the connect() man page). Handling 5538 // of asynchronously established connections is required for both 5539 // blocking and non-blocking sockets. 5540 // EINTR The connection attempt was interrupted 5541 // before any data arrived by the delivery of 5542 // a signal. The connection, however, will be 5543 // established asynchronously. 5544 // 5545 // EINPROGRESS The socket is non-blocking, and the connec- 5546 // tion cannot be completed immediately. 5547 // 5548 // EALREADY The socket is non-blocking, and a previous 5549 // connection attempt has not yet been com- 5550 // pleted. 5551 // 5552 // EISCONN The socket is already connected. 5553 if (_result == OS_ERR && errno == EINTR) { 5554 // restarting a connect() changes its errno semantics 5555 RESTARTABLE(::connect(fd, him, len), _result); 5556 // undo these changes 5557 if (_result == OS_ERR) { 5558 if (errno == EALREADY) { 5559 errno = EINPROGRESS; // fall through 5560 } else if (errno == EISCONN) { 5561 errno = 0; 5562 return OS_OK; 5563 } 5564 } 5565 } 5566 return _result; 5567 } 5568 5569 // Get the default path to the core file 5570 // Returns the length of the string 5571 int os::get_core_path(char* buffer, size_t bufferSize) { 5572 const char* p = get_current_directory(buffer, bufferSize); 5573 5574 if (p == NULL) { 5575 assert(p != NULL, "failed to get current directory"); 5576 return 0; 5577 } 5578 5579 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 5580 p, current_process_id()); 5581 5582 return strlen(buffer); 5583 } 5584 5585 #ifndef PRODUCT 5586 void TestReserveMemorySpecial_test() { 5587 // No tests available for this platform 5588 } 5589 #endif 5590 5591 bool os::start_debugging(char *buf, int buflen) { 5592 int len = (int)strlen(buf); 5593 char *p = &buf[len]; 5594 5595 jio_snprintf(p, buflen-len, 5596 "\n\n" 5597 "Do you want to debug the problem?\n\n" 5598 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n" 5599 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 5600 "Otherwise, press RETURN to abort...", 5601 os::current_process_id(), os::current_thread_id()); 5602 5603 bool yes = os::message_box("Unexpected Error", buf); 5604 5605 if (yes) { 5606 // yes, user asked VM to launch debugger 5607 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id()); 5608 5609 os::fork_and_exec(buf); 5610 yes = false; 5611 } 5612 return yes; 5613 }