1 /* 2 * Copyright (c) 1997, 2014, 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 "memory/allocation.inline.hpp" 36 #include "memory/filemap.hpp" 37 #include "mutex_solaris.inline.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "os_share_solaris.hpp" 40 #include "prims/jniFastGetField.hpp" 41 #include "prims/jvm.h" 42 #include "prims/jvm_misc.hpp" 43 #include "runtime/arguments.hpp" 44 #include "runtime/extendedPC.hpp" 45 #include "runtime/globals.hpp" 46 #include "runtime/interfaceSupport.hpp" 47 #include "runtime/java.hpp" 48 #include "runtime/javaCalls.hpp" 49 #include "runtime/mutexLocker.hpp" 50 #include "runtime/objectMonitor.hpp" 51 #include "runtime/osThread.hpp" 52 #include "runtime/perfMemory.hpp" 53 #include "runtime/sharedRuntime.hpp" 54 #include "runtime/statSampler.hpp" 55 #include "runtime/stubRoutines.hpp" 56 #include "runtime/thread.inline.hpp" 57 #include "runtime/threadCritical.hpp" 58 #include "runtime/timer.hpp" 59 #include "services/attachListener.hpp" 60 #include "services/memTracker.hpp" 61 #include "services/runtimeService.hpp" 62 #include "utilities/decoder.hpp" 63 #include "utilities/defaultStream.hpp" 64 #include "utilities/events.hpp" 65 #include "utilities/growableArray.hpp" 66 #include "utilities/vmError.hpp" 67 68 // put OS-includes here 69 # include <dlfcn.h> 70 # include <errno.h> 71 # include <exception> 72 # include <link.h> 73 # include <poll.h> 74 # include <pthread.h> 75 # include <pwd.h> 76 # include <schedctl.h> 77 # include <setjmp.h> 78 # include <signal.h> 79 # include <stdio.h> 80 # include <alloca.h> 81 # include <sys/filio.h> 82 # include <sys/ipc.h> 83 # include <sys/lwp.h> 84 # include <sys/machelf.h> // for elf Sym structure used by dladdr1 85 # include <sys/mman.h> 86 # include <sys/processor.h> 87 # include <sys/procset.h> 88 # include <sys/pset.h> 89 # include <sys/resource.h> 90 # include <sys/shm.h> 91 # include <sys/socket.h> 92 # include <sys/stat.h> 93 # include <sys/systeminfo.h> 94 # include <sys/time.h> 95 # include <sys/times.h> 96 # include <sys/types.h> 97 # include <sys/wait.h> 98 # include <sys/utsname.h> 99 # include <thread.h> 100 # include <unistd.h> 101 # include <sys/priocntl.h> 102 # include <sys/rtpriocntl.h> 103 # include <sys/tspriocntl.h> 104 # include <sys/iapriocntl.h> 105 # include <sys/fxpriocntl.h> 106 # include <sys/loadavg.h> 107 # include <string.h> 108 # include <stdio.h> 109 110 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 111 # include <sys/procfs.h> // see comment in <sys/procfs.h> 112 113 #define MAX_PATH (2 * K) 114 115 // for timer info max values which include all bits 116 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 117 118 119 // Here are some liblgrp types from sys/lgrp_user.h to be able to 120 // compile on older systems without this header file. 121 122 #ifndef MADV_ACCESS_LWP 123 # define MADV_ACCESS_LWP 7 /* next LWP to access heavily */ 124 #endif 125 #ifndef MADV_ACCESS_MANY 126 # define MADV_ACCESS_MANY 8 /* many processes to access heavily */ 127 #endif 128 129 #ifndef LGRP_RSRC_CPU 130 # define LGRP_RSRC_CPU 0 /* CPU resources */ 131 #endif 132 #ifndef LGRP_RSRC_MEM 133 # define LGRP_RSRC_MEM 1 /* memory resources */ 134 #endif 135 136 // see thr_setprio(3T) for the basis of these numbers 137 #define MinimumPriority 0 138 #define NormalPriority 64 139 #define MaximumPriority 127 140 141 // 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 161 162 163 // "default" initializers for missing libc APIs 164 extern "C" { 165 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 166 static int lwp_mutex_destroy(mutex_t *mx) { return 0; } 167 168 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 169 static int lwp_cond_destroy(cond_t *cv) { return 0; } 170 } 171 172 // "default" initializers for pthread-based synchronization 173 extern "C" { 174 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 175 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 176 } 177 178 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); 179 180 // Thread Local Storage 181 // This is common to all Solaris platforms so it is defined here, 182 // in this common file. 183 // The declarations are in the os_cpu threadLS*.hpp files. 184 // 185 // Static member initialization for TLS 186 Thread* ThreadLocalStorage::_get_thread_cache[ThreadLocalStorage::_pd_cache_size] = {NULL}; 187 188 #ifndef PRODUCT 189 #define _PCT(n,d) ((100.0*(double)(n))/(double)(d)) 190 191 int ThreadLocalStorage::_tcacheHit = 0; 192 int ThreadLocalStorage::_tcacheMiss = 0; 193 194 void ThreadLocalStorage::print_statistics() { 195 int total = _tcacheMiss+_tcacheHit; 196 tty->print_cr("Thread cache hits %d misses %d total %d percent %f\n", 197 _tcacheHit, _tcacheMiss, total, _PCT(_tcacheHit, total)); 198 } 199 #undef _PCT 200 #endif // PRODUCT 201 202 Thread* ThreadLocalStorage::get_thread_via_cache_slowly(uintptr_t raw_id, 203 int index) { 204 Thread *thread = get_thread_slow(); 205 if (thread != NULL) { 206 address sp = os::current_stack_pointer(); 207 guarantee(thread->_stack_base == NULL || 208 (sp <= thread->_stack_base && 209 sp >= thread->_stack_base - thread->_stack_size) || 210 is_error_reported(), 211 "sp must be inside of selected thread stack"); 212 213 thread->set_self_raw_id(raw_id); // mark for quick retrieval 214 _get_thread_cache[ index ] = thread; 215 } 216 return thread; 217 } 218 219 220 static const double all_zero[ sizeof(Thread) / sizeof(double) + 1 ] = {0}; 221 #define NO_CACHED_THREAD ((Thread*)all_zero) 222 223 void ThreadLocalStorage::pd_set_thread(Thread* thread) { 224 225 // Store the new value before updating the cache to prevent a race 226 // between get_thread_via_cache_slowly() and this store operation. 227 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread); 228 229 // Update thread cache with new thread if setting on thread create, 230 // or NO_CACHED_THREAD (zeroed) thread if resetting thread on exit. 231 uintptr_t raw = pd_raw_thread_id(); 232 int ix = pd_cache_index(raw); 233 _get_thread_cache[ix] = thread == NULL ? NO_CACHED_THREAD : thread; 234 } 235 236 void ThreadLocalStorage::pd_init() { 237 for (int i = 0; i < _pd_cache_size; i++) { 238 _get_thread_cache[i] = NO_CACHED_THREAD; 239 } 240 } 241 242 // Invalidate all the caches (happens to be the same as pd_init). 243 void ThreadLocalStorage::pd_invalidate_all() { pd_init(); } 244 245 #undef NO_CACHED_THREAD 246 247 // END Thread Local Storage 248 249 static inline size_t adjust_stack_size(address base, size_t size) { 250 if ((ssize_t)size < 0) { 251 // 4759953: Compensate for ridiculous stack size. 252 size = max_intx; 253 } 254 if (size > (size_t)base) { 255 // 4812466: Make sure size doesn't allow the stack to wrap the address space. 256 size = (size_t)base; 257 } 258 return size; 259 } 260 261 static inline stack_t get_stack_info() { 262 stack_t st; 263 int retval = thr_stksegment(&st); 264 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); 265 assert(retval == 0, "incorrect return value from thr_stksegment"); 266 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 267 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 268 return st; 269 } 270 271 address os::current_stack_base() { 272 int r = thr_main() ; 273 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ; 274 bool is_primordial_thread = r; 275 276 // Workaround 4352906, avoid calls to thr_stksegment by 277 // thr_main after the first one (it looks like we trash 278 // some data, causing the value for ss_sp to be incorrect). 279 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) { 280 stack_t st = get_stack_info(); 281 if (is_primordial_thread) { 282 // cache initial value of stack base 283 os::Solaris::_main_stack_base = (address)st.ss_sp; 284 } 285 return (address)st.ss_sp; 286 } else { 287 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); 288 return os::Solaris::_main_stack_base; 289 } 290 } 291 292 size_t os::current_stack_size() { 293 size_t size; 294 295 int r = thr_main() ; 296 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ; 297 if(!r) { 298 size = get_stack_info().ss_size; 299 } else { 300 struct rlimit limits; 301 getrlimit(RLIMIT_STACK, &limits); 302 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); 303 } 304 // base may not be page aligned 305 address base = current_stack_base(); 306 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());; 307 return (size_t)(base - bottom); 308 } 309 310 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 311 return localtime_r(clock, res); 312 } 313 314 void os::Solaris::try_enable_extended_io() { 315 typedef int (*enable_extended_FILE_stdio_t)(int, int); 316 317 if (!UseExtendedFileIO) { 318 return; 319 } 320 321 enable_extended_FILE_stdio_t enabler = 322 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT, 323 "enable_extended_FILE_stdio"); 324 if (enabler) { 325 enabler(-1, -1); 326 } 327 } 328 329 static int _processors_online = 0; 330 331 jint os::Solaris::_os_thread_limit = 0; 332 volatile jint os::Solaris::_os_thread_count = 0; 333 334 julong os::available_memory() { 335 return Solaris::available_memory(); 336 } 337 338 julong os::Solaris::available_memory() { 339 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); 340 } 341 342 julong os::Solaris::_physical_memory = 0; 343 344 julong os::physical_memory() { 345 return Solaris::physical_memory(); 346 } 347 348 static hrtime_t first_hrtime = 0; 349 static const hrtime_t hrtime_hz = 1000*1000*1000; 350 const int LOCK_BUSY = 1; 351 const int LOCK_FREE = 0; 352 const int LOCK_INVALID = -1; 353 static volatile hrtime_t max_hrtime = 0; 354 static volatile int max_hrtime_lock = LOCK_FREE; // Update counter with LSB as lock-in-progress 355 356 357 void os::Solaris::initialize_system_info() { 358 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); 359 _processors_online = sysconf (_SC_NPROCESSORS_ONLN); 360 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE); 361 } 362 363 int os::active_processor_count() { 364 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 365 pid_t pid = getpid(); 366 psetid_t pset = PS_NONE; 367 // Are we running in a processor set or is there any processor set around? 368 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) { 369 uint_t pset_cpus; 370 // Query the number of cpus available to us. 371 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) { 372 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check"); 373 _processors_online = pset_cpus; 374 return pset_cpus; 375 } 376 } 377 // Otherwise return number of online cpus 378 return online_cpus; 379 } 380 381 static bool find_processors_in_pset(psetid_t pset, 382 processorid_t** id_array, 383 uint_t* id_length) { 384 bool result = false; 385 // Find the number of processors in the processor set. 386 if (pset_info(pset, NULL, id_length, NULL) == 0) { 387 // Make up an array to hold their ids. 388 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 389 // Fill in the array with their processor ids. 390 if (pset_info(pset, NULL, id_length, *id_array) == 0) { 391 result = true; 392 } 393 } 394 return result; 395 } 396 397 // Callers of find_processors_online() must tolerate imprecise results -- 398 // the system configuration can change asynchronously because of DR 399 // or explicit psradm operations. 400 // 401 // We also need to take care that the loop (below) terminates as the 402 // number of processors online can change between the _SC_NPROCESSORS_ONLN 403 // request and the loop that builds the list of processor ids. Unfortunately 404 // there's no reliable way to determine the maximum valid processor id, 405 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online 406 // man pages, which claim the processor id set is "sparse, but 407 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually 408 // exit the loop. 409 // 410 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's 411 // not available on S8.0. 412 413 static bool find_processors_online(processorid_t** id_array, 414 uint* id_length) { 415 const processorid_t MAX_PROCESSOR_ID = 100000 ; 416 // Find the number of processors online. 417 *id_length = sysconf(_SC_NPROCESSORS_ONLN); 418 // Make up an array to hold their ids. 419 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 420 // Processors need not be numbered consecutively. 421 long found = 0; 422 processorid_t next = 0; 423 while (found < *id_length && next < MAX_PROCESSOR_ID) { 424 processor_info_t info; 425 if (processor_info(next, &info) == 0) { 426 // NB, PI_NOINTR processors are effectively online ... 427 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) { 428 (*id_array)[found] = next; 429 found += 1; 430 } 431 } 432 next += 1; 433 } 434 if (found < *id_length) { 435 // The loop above didn't identify the expected number of processors. 436 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN) 437 // and re-running the loop, above, but there's no guarantee of progress 438 // if the system configuration is in flux. Instead, we just return what 439 // we've got. Note that in the worst case find_processors_online() could 440 // return an empty set. (As a fall-back in the case of the empty set we 441 // could just return the ID of the current processor). 442 *id_length = found ; 443 } 444 445 return true; 446 } 447 448 static bool assign_distribution(processorid_t* id_array, 449 uint id_length, 450 uint* distribution, 451 uint distribution_length) { 452 // We assume we can assign processorid_t's to uint's. 453 assert(sizeof(processorid_t) == sizeof(uint), 454 "can't convert processorid_t to uint"); 455 // Quick check to see if we won't succeed. 456 if (id_length < distribution_length) { 457 return false; 458 } 459 // Assign processor ids to the distribution. 460 // Try to shuffle processors to distribute work across boards, 461 // assuming 4 processors per board. 462 const uint processors_per_board = ProcessDistributionStride; 463 // Find the maximum processor id. 464 processorid_t max_id = 0; 465 for (uint m = 0; m < id_length; m += 1) { 466 max_id = MAX2(max_id, id_array[m]); 467 } 468 // The next id, to limit loops. 469 const processorid_t limit_id = max_id + 1; 470 // Make up markers for available processors. 471 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal); 472 for (uint c = 0; c < limit_id; c += 1) { 473 available_id[c] = false; 474 } 475 for (uint a = 0; a < id_length; a += 1) { 476 available_id[id_array[a]] = true; 477 } 478 // Step by "boards", then by "slot", copying to "assigned". 479 // NEEDS_CLEANUP: The assignment of processors should be stateful, 480 // remembering which processors have been assigned by 481 // previous calls, etc., so as to distribute several 482 // independent calls of this method. What we'd like is 483 // It would be nice to have an API that let us ask 484 // how many processes are bound to a processor, 485 // but we don't have that, either. 486 // In the short term, "board" is static so that 487 // subsequent distributions don't all start at board 0. 488 static uint board = 0; 489 uint assigned = 0; 490 // Until we've found enough processors .... 491 while (assigned < distribution_length) { 492 // ... find the next available processor in the board. 493 for (uint slot = 0; slot < processors_per_board; slot += 1) { 494 uint try_id = board * processors_per_board + slot; 495 if ((try_id < limit_id) && (available_id[try_id] == true)) { 496 distribution[assigned] = try_id; 497 available_id[try_id] = false; 498 assigned += 1; 499 break; 500 } 501 } 502 board += 1; 503 if (board * processors_per_board + 0 >= limit_id) { 504 board = 0; 505 } 506 } 507 if (available_id != NULL) { 508 FREE_C_HEAP_ARRAY(bool, available_id, mtInternal); 509 } 510 return true; 511 } 512 513 void os::set_native_thread_name(const char *name) { 514 // Not yet implemented. 515 return; 516 } 517 518 bool os::distribute_processes(uint length, uint* distribution) { 519 bool result = false; 520 // Find the processor id's of all the available CPUs. 521 processorid_t* id_array = NULL; 522 uint id_length = 0; 523 // There are some races between querying information and using it, 524 // since processor sets can change dynamically. 525 psetid_t pset = PS_NONE; 526 // Are we running in a processor set? 527 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) { 528 result = find_processors_in_pset(pset, &id_array, &id_length); 529 } else { 530 result = find_processors_online(&id_array, &id_length); 531 } 532 if (result == true) { 533 if (id_length >= length) { 534 result = assign_distribution(id_array, id_length, distribution, length); 535 } else { 536 result = false; 537 } 538 } 539 if (id_array != NULL) { 540 FREE_C_HEAP_ARRAY(processorid_t, id_array, mtInternal); 541 } 542 return result; 543 } 544 545 bool os::bind_to_processor(uint processor_id) { 546 // We assume that a processorid_t can be stored in a uint. 547 assert(sizeof(uint) == sizeof(processorid_t), 548 "can't convert uint to processorid_t"); 549 int bind_result = 550 processor_bind(P_LWPID, // bind LWP. 551 P_MYID, // bind current LWP. 552 (processorid_t) processor_id, // id. 553 NULL); // don't return old binding. 554 return (bind_result == 0); 555 } 556 557 bool os::getenv(const char* name, char* buffer, int len) { 558 char* val = ::getenv( name ); 559 if ( val == NULL 560 || strlen(val) + 1 > len ) { 561 if (len > 0) buffer[0] = 0; // return a null string 562 return false; 563 } 564 strcpy( buffer, val ); 565 return true; 566 } 567 568 569 // Return true if user is running as root. 570 571 bool os::have_special_privileges() { 572 static bool init = false; 573 static bool privileges = false; 574 if (!init) { 575 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 576 init = true; 577 } 578 return privileges; 579 } 580 581 582 void os::init_system_properties_values() { 583 char arch[12]; 584 sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); 585 586 // The next steps are taken in the product version: 587 // 588 // Obtain the JAVA_HOME value from the location of libjvm.so. 589 // This library should be located at: 590 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 591 // 592 // If "/jre/lib/" appears at the right place in the path, then we 593 // assume libjvm.so is installed in a JDK and we use this path. 594 // 595 // Otherwise exit with message: "Could not create the Java virtual machine." 596 // 597 // The following extra steps are taken in the debugging version: 598 // 599 // If "/jre/lib/" does NOT appear at the right place in the path 600 // instead of exit check for $JAVA_HOME environment variable. 601 // 602 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 603 // then we append a fake suffix "hotspot/libjvm.so" to this path so 604 // it looks like libjvm.so is installed there 605 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 606 // 607 // Otherwise exit. 608 // 609 // Important note: if the location of libjvm.so changes this 610 // code needs to be changed accordingly. 611 612 // The next few definitions allow the code to be verbatim: 613 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) 614 #define free(p) FREE_C_HEAP_ARRAY(char, p, mtInternal) 615 #define getenv(n) ::getenv(n) 616 617 #define EXTENSIONS_DIR "/lib/ext" 618 #define ENDORSED_DIR "/lib/endorsed" 619 #define COMMON_DIR "/usr/jdk/packages" 620 621 { 622 /* sysclasspath, java_home, dll_dir */ 623 { 624 char *home_path; 625 char *dll_path; 626 char *pslash; 627 char buf[MAXPATHLEN]; 628 os::jvm_path(buf, sizeof(buf)); 629 630 // Found the full path to libjvm.so. 631 // Now cut the path to <java_home>/jre if we can. 632 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ 633 pslash = strrchr(buf, '/'); 634 if (pslash != NULL) 635 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ 636 dll_path = malloc(strlen(buf) + 1); 637 if (dll_path == NULL) 638 return; 639 strcpy(dll_path, buf); 640 Arguments::set_dll_dir(dll_path); 641 642 if (pslash != NULL) { 643 pslash = strrchr(buf, '/'); 644 if (pslash != NULL) { 645 *pslash = '\0'; /* get rid of /<arch> */ 646 pslash = strrchr(buf, '/'); 647 if (pslash != NULL) 648 *pslash = '\0'; /* get rid of /lib */ 649 } 650 } 651 652 home_path = malloc(strlen(buf) + 1); 653 if (home_path == NULL) 654 return; 655 strcpy(home_path, buf); 656 Arguments::set_java_home(home_path); 657 658 if (!set_boot_path('/', ':')) 659 return; 660 } 661 662 /* 663 * Where to look for native libraries 664 */ 665 { 666 // Use dlinfo() to determine the correct java.library.path. 667 // 668 // If we're launched by the Java launcher, and the user 669 // does not set java.library.path explicitly on the commandline, 670 // the Java launcher sets LD_LIBRARY_PATH for us and unsets 671 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case 672 // dlinfo returns LD_LIBRARY_PATH + crle settings (including 673 // /usr/lib), which is exactly what we want. 674 // 675 // If the user does set java.library.path, it completely 676 // overwrites this setting, and always has. 677 // 678 // If we're not launched by the Java launcher, we may 679 // get here with any/all of the LD_LIBRARY_PATH[_32|64] 680 // settings. Again, dlinfo does exactly what we want. 681 682 Dl_serinfo _info, *info = &_info; 683 Dl_serpath *path; 684 char* library_path; 685 char *common_path; 686 int i; 687 688 // determine search path count and required buffer size 689 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) { 690 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror()); 691 } 692 693 // allocate new buffer and initialize 694 info = (Dl_serinfo*)malloc(_info.dls_size); 695 if (info == NULL) { 696 vm_exit_out_of_memory(_info.dls_size, OOM_MALLOC_ERROR, 697 "init_system_properties_values info"); 698 } 699 info->dls_size = _info.dls_size; 700 info->dls_cnt = _info.dls_cnt; 701 702 // obtain search path information 703 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) { 704 free(info); 705 vm_exit_during_initialization("dlinfo SERINFO request", dlerror()); 706 } 707 708 path = &info->dls_serpath[0]; 709 710 // Note: Due to a legacy implementation, most of the library path 711 // is set in the launcher. This was to accomodate linking restrictions 712 // on legacy Solaris implementations (which are no longer supported). 713 // Eventually, all the library path setting will be done here. 714 // 715 // However, to prevent the proliferation of improperly built native 716 // libraries, the new path component /usr/jdk/packages is added here. 717 718 // Determine the actual CPU architecture. 719 char cpu_arch[12]; 720 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 721 #ifdef _LP64 722 // If we are a 64-bit vm, perform the following translations: 723 // sparc -> sparcv9 724 // i386 -> amd64 725 if (strcmp(cpu_arch, "sparc") == 0) 726 strcat(cpu_arch, "v9"); 727 else if (strcmp(cpu_arch, "i386") == 0) 728 strcpy(cpu_arch, "amd64"); 729 #endif 730 731 // Construct the invariant part of ld_library_path. Note that the 732 // space for the colon and the trailing null are provided by the 733 // nulls included by the sizeof operator. 734 size_t bufsize = sizeof(COMMON_DIR) + sizeof("/lib/") + strlen(cpu_arch); 735 common_path = malloc(bufsize); 736 if (common_path == NULL) { 737 free(info); 738 vm_exit_out_of_memory(bufsize, OOM_MALLOC_ERROR, 739 "init_system_properties_values common_path"); 740 } 741 sprintf(common_path, COMMON_DIR "/lib/%s", cpu_arch); 742 743 // struct size is more than sufficient for the path components obtained 744 // through the dlinfo() call, so only add additional space for the path 745 // components explicitly added here. 746 bufsize = info->dls_size + strlen(common_path); 747 library_path = malloc(bufsize); 748 if (library_path == NULL) { 749 free(info); 750 free(common_path); 751 vm_exit_out_of_memory(bufsize, OOM_MALLOC_ERROR, 752 "init_system_properties_values library_path"); 753 } 754 library_path[0] = '\0'; 755 756 // Construct the desired Java library path from the linker's library 757 // search path. 758 // 759 // For compatibility, it is optimal that we insert the additional path 760 // components specific to the Java VM after those components specified 761 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so 762 // infrastructure. 763 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it 764 strcpy(library_path, common_path); 765 } else { 766 int inserted = 0; 767 for (i = 0; i < info->dls_cnt; i++, path++) { 768 uint_t flags = path->dls_flags & LA_SER_MASK; 769 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) { 770 strcat(library_path, common_path); 771 strcat(library_path, os::path_separator()); 772 inserted = 1; 773 } 774 strcat(library_path, path->dls_name); 775 strcat(library_path, os::path_separator()); 776 } 777 // eliminate trailing path separator 778 library_path[strlen(library_path)-1] = '\0'; 779 } 780 781 // happens before argument parsing - can't use a trace flag 782 // tty->print_raw("init_system_properties_values: native lib path: "); 783 // tty->print_raw_cr(library_path); 784 785 // callee copies into its own buffer 786 Arguments::set_library_path(library_path); 787 788 free(common_path); 789 free(library_path); 790 free(info); 791 } 792 793 /* 794 * Extensions directories. 795 * 796 * Note that the space for the colon and the trailing null are provided 797 * by the nulls included by the sizeof operator (so actually one byte more 798 * than necessary is allocated). 799 */ 800 { 801 char *buf = (char *) malloc(strlen(Arguments::get_java_home()) + 802 sizeof(EXTENSIONS_DIR) + sizeof(COMMON_DIR) + 803 sizeof(EXTENSIONS_DIR)); 804 sprintf(buf, "%s" EXTENSIONS_DIR ":" COMMON_DIR EXTENSIONS_DIR, 805 Arguments::get_java_home()); 806 Arguments::set_ext_dirs(buf); 807 } 808 809 /* Endorsed standards default directory. */ 810 { 811 char * buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); 812 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); 813 Arguments::set_endorsed_dirs(buf); 814 } 815 } 816 817 #undef malloc 818 #undef free 819 #undef getenv 820 #undef EXTENSIONS_DIR 821 #undef ENDORSED_DIR 822 #undef COMMON_DIR 823 824 } 825 826 void os::breakpoint() { 827 BREAKPOINT; 828 } 829 830 bool os::obsolete_option(const JavaVMOption *option) 831 { 832 if (!strncmp(option->optionString, "-Xt", 3)) { 833 return true; 834 } else if (!strncmp(option->optionString, "-Xtm", 4)) { 835 return true; 836 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) { 837 return true; 838 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) { 839 return true; 840 } 841 return false; 842 } 843 844 bool os::Solaris::valid_stack_address(Thread* thread, address sp) { 845 address stackStart = (address)thread->stack_base(); 846 address stackEnd = (address)(stackStart - (address)thread->stack_size()); 847 if (sp < stackStart && sp >= stackEnd ) return true; 848 return false; 849 } 850 851 extern "C" void breakpoint() { 852 // use debugger to set breakpoint here 853 } 854 855 static thread_t main_thread; 856 857 // Thread start routine for all new Java threads 858 extern "C" void* java_start(void* thread_addr) { 859 // Try to randomize the cache line index of hot stack frames. 860 // This helps when threads of the same stack traces evict each other's 861 // cache lines. The threads can be either from the same JVM instance, or 862 // from different JVM instances. The benefit is especially true for 863 // processors with hyperthreading technology. 864 static int counter = 0; 865 int pid = os::current_process_id(); 866 alloca(((pid ^ counter++) & 7) * 128); 867 868 int prio; 869 Thread* thread = (Thread*)thread_addr; 870 OSThread* osthr = thread->osthread(); 871 872 osthr->set_lwp_id( _lwp_self() ); // Store lwp in case we are bound 873 thread->_schedctl = (void *) schedctl_init () ; 874 875 if (UseNUMA) { 876 int lgrp_id = os::numa_get_group_id(); 877 if (lgrp_id != -1) { 878 thread->set_lgrp_id(lgrp_id); 879 } 880 } 881 882 // If the creator called set priority before we started, 883 // we need to call set_native_priority now that we have an lwp. 884 // We used to get the priority from thr_getprio (we called 885 // thr_setprio way back in create_thread) and pass it to 886 // set_native_priority, but Solaris scales the priority 887 // in java_to_os_priority, so when we read it back here, 888 // we pass trash to set_native_priority instead of what's 889 // in java_to_os_priority. So we save the native priority 890 // in the osThread and recall it here. 891 892 if ( osthr->thread_id() != -1 ) { 893 if ( UseThreadPriorities ) { 894 int prio = osthr->native_priority(); 895 if (ThreadPriorityVerbose) { 896 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " 897 INTPTR_FORMAT ", setting priority: %d\n", 898 osthr->thread_id(), osthr->lwp_id(), prio); 899 } 900 os::set_native_priority(thread, prio); 901 } 902 } else if (ThreadPriorityVerbose) { 903 warning("Can't set priority in _start routine, thread id hasn't been set\n"); 904 } 905 906 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 907 908 // initialize signal mask for this thread 909 os::Solaris::hotspot_sigmask(thread); 910 911 thread->run(); 912 913 // One less thread is executing 914 // When the VMThread gets here, the main thread may have already exited 915 // which frees the CodeHeap containing the Atomic::dec code 916 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 917 Atomic::dec(&os::Solaris::_os_thread_count); 918 } 919 920 if (UseDetachedThreads) { 921 thr_exit(NULL); 922 ShouldNotReachHere(); 923 } 924 return NULL; 925 } 926 927 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) { 928 // Allocate the OSThread object 929 OSThread* osthread = new OSThread(NULL, NULL); 930 if (osthread == NULL) return NULL; 931 932 // Store info on the Solaris thread into the OSThread 933 osthread->set_thread_id(thread_id); 934 osthread->set_lwp_id(_lwp_self()); 935 thread->_schedctl = (void *) schedctl_init () ; 936 937 if (UseNUMA) { 938 int lgrp_id = os::numa_get_group_id(); 939 if (lgrp_id != -1) { 940 thread->set_lgrp_id(lgrp_id); 941 } 942 } 943 944 if ( ThreadPriorityVerbose ) { 945 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n", 946 osthread->thread_id(), osthread->lwp_id() ); 947 } 948 949 // Initial thread state is INITIALIZED, not SUSPENDED 950 osthread->set_state(INITIALIZED); 951 952 return osthread; 953 } 954 955 void os::Solaris::hotspot_sigmask(Thread* thread) { 956 957 //Save caller's signal mask 958 sigset_t sigmask; 959 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask); 960 OSThread *osthread = thread->osthread(); 961 osthread->set_caller_sigmask(sigmask); 962 963 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL); 964 if (!ReduceSignalUsage) { 965 if (thread->is_VM_thread()) { 966 // Only the VM thread handles BREAK_SIGNAL ... 967 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL); 968 } else { 969 // ... all other threads block BREAK_SIGNAL 970 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked"); 971 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL); 972 } 973 } 974 } 975 976 bool os::create_attached_thread(JavaThread* thread) { 977 #ifdef ASSERT 978 thread->verify_not_published(); 979 #endif 980 OSThread* osthread = create_os_thread(thread, thr_self()); 981 if (osthread == NULL) { 982 return false; 983 } 984 985 // Initial thread state is RUNNABLE 986 osthread->set_state(RUNNABLE); 987 thread->set_osthread(osthread); 988 989 // initialize signal mask for this thread 990 // and save the caller's signal mask 991 os::Solaris::hotspot_sigmask(thread); 992 993 return true; 994 } 995 996 bool os::create_main_thread(JavaThread* thread) { 997 #ifdef ASSERT 998 thread->verify_not_published(); 999 #endif 1000 if (_starting_thread == NULL) { 1001 _starting_thread = create_os_thread(thread, main_thread); 1002 if (_starting_thread == NULL) { 1003 return false; 1004 } 1005 } 1006 1007 // The primodial thread is runnable from the start 1008 _starting_thread->set_state(RUNNABLE); 1009 1010 thread->set_osthread(_starting_thread); 1011 1012 // initialize signal mask for this thread 1013 // and save the caller's signal mask 1014 os::Solaris::hotspot_sigmask(thread); 1015 1016 return true; 1017 } 1018 1019 // _T2_libthread is true if we believe we are running with the newer 1020 // SunSoft lwp/libthread.so (2.8 patch, 2.9 default) 1021 bool os::Solaris::_T2_libthread = false; 1022 1023 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 1024 // Allocate the OSThread object 1025 OSThread* osthread = new OSThread(NULL, NULL); 1026 if (osthread == NULL) { 1027 return false; 1028 } 1029 1030 if ( ThreadPriorityVerbose ) { 1031 char *thrtyp; 1032 switch ( thr_type ) { 1033 case vm_thread: 1034 thrtyp = (char *)"vm"; 1035 break; 1036 case cgc_thread: 1037 thrtyp = (char *)"cgc"; 1038 break; 1039 case pgc_thread: 1040 thrtyp = (char *)"pgc"; 1041 break; 1042 case java_thread: 1043 thrtyp = (char *)"java"; 1044 break; 1045 case compiler_thread: 1046 thrtyp = (char *)"compiler"; 1047 break; 1048 case watcher_thread: 1049 thrtyp = (char *)"watcher"; 1050 break; 1051 default: 1052 thrtyp = (char *)"unknown"; 1053 break; 1054 } 1055 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp); 1056 } 1057 1058 // Calculate stack size if it's not specified by caller. 1059 if (stack_size == 0) { 1060 // The default stack size 1M (2M for LP64). 1061 stack_size = (BytesPerWord >> 2) * K * K; 1062 1063 switch (thr_type) { 1064 case os::java_thread: 1065 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 1066 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create(); 1067 break; 1068 case os::compiler_thread: 1069 if (CompilerThreadStackSize > 0) { 1070 stack_size = (size_t)(CompilerThreadStackSize * K); 1071 break; 1072 } // else fall through: 1073 // use VMThreadStackSize if CompilerThreadStackSize is not defined 1074 case os::vm_thread: 1075 case os::pgc_thread: 1076 case os::cgc_thread: 1077 case os::watcher_thread: 1078 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 1079 break; 1080 } 1081 } 1082 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed); 1083 1084 // Initial state is ALLOCATED but not INITIALIZED 1085 osthread->set_state(ALLOCATED); 1086 1087 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) { 1088 // We got lots of threads. Check if we still have some address space left. 1089 // Need to be at least 5Mb of unreserved address space. We do check by 1090 // trying to reserve some. 1091 const size_t VirtualMemoryBangSize = 20*K*K; 1092 char* mem = os::reserve_memory(VirtualMemoryBangSize); 1093 if (mem == NULL) { 1094 delete osthread; 1095 return false; 1096 } else { 1097 // Release the memory again 1098 os::release_memory(mem, VirtualMemoryBangSize); 1099 } 1100 } 1101 1102 // Setup osthread because the child thread may need it. 1103 thread->set_osthread(osthread); 1104 1105 // Create the Solaris thread 1106 // explicit THR_BOUND for T2_libthread case in case 1107 // that assumption is not accurate, but our alternate signal stack 1108 // handling is based on it which must have bound threads 1109 thread_t tid = 0; 1110 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED 1111 | ((UseBoundThreads || os::Solaris::T2_libthread() || 1112 (thr_type == vm_thread) || 1113 (thr_type == cgc_thread) || 1114 (thr_type == pgc_thread) || 1115 (thr_type == compiler_thread && BackgroundCompilation)) ? 1116 THR_BOUND : 0); 1117 int status; 1118 1119 // 4376845 -- libthread/kernel don't provide enough LWPs to utilize all CPUs. 1120 // 1121 // On multiprocessors systems, libthread sometimes under-provisions our 1122 // process with LWPs. On a 30-way systems, for instance, we could have 1123 // 50 user-level threads in ready state and only 2 or 3 LWPs assigned 1124 // to our process. This can result in under utilization of PEs. 1125 // I suspect the problem is related to libthread's LWP 1126 // pool management and to the kernel's SIGBLOCKING "last LWP parked" 1127 // upcall policy. 1128 // 1129 // The following code is palliative -- it attempts to ensure that our 1130 // process has sufficient LWPs to take advantage of multiple PEs. 1131 // Proper long-term cures include using user-level threads bound to LWPs 1132 // (THR_BOUND) or using LWP-based synchronization. Note that there is a 1133 // slight timing window with respect to sampling _os_thread_count, but 1134 // the race is benign. Also, we should periodically recompute 1135 // _processors_online as the min of SC_NPROCESSORS_ONLN and the 1136 // the number of PEs in our partition. You might be tempted to use 1137 // THR_NEW_LWP here, but I'd recommend against it as that could 1138 // result in undesirable growth of the libthread's LWP pool. 1139 // The fix below isn't sufficient; for instance, it doesn't take into count 1140 // LWPs parked on IO. It does, however, help certain CPU-bound benchmarks. 1141 // 1142 // Some pathologies this scheme doesn't handle: 1143 // * Threads can block, releasing the LWPs. The LWPs can age out. 1144 // When a large number of threads become ready again there aren't 1145 // enough LWPs available to service them. This can occur when the 1146 // number of ready threads oscillates. 1147 // * LWPs/Threads park on IO, thus taking the LWP out of circulation. 1148 // 1149 // Finally, we should call thr_setconcurrency() periodically to refresh 1150 // the LWP pool and thwart the LWP age-out mechanism. 1151 // The "+3" term provides a little slop -- we want to slightly overprovision. 1152 1153 if (AdjustConcurrency && os::Solaris::_os_thread_count < (_processors_online+3)) { 1154 if (!(flags & THR_BOUND)) { 1155 thr_setconcurrency (os::Solaris::_os_thread_count); // avoid starvation 1156 } 1157 } 1158 // Although this doesn't hurt, we should warn of undefined behavior 1159 // when using unbound T1 threads with schedctl(). This should never 1160 // happen, as the compiler and VM threads are always created bound 1161 DEBUG_ONLY( 1162 if ((VMThreadHintNoPreempt || CompilerThreadHintNoPreempt) && 1163 (!os::Solaris::T2_libthread() && (!(flags & THR_BOUND))) && 1164 ((thr_type == vm_thread) || (thr_type == cgc_thread) || 1165 (thr_type == pgc_thread) || (thr_type == compiler_thread && BackgroundCompilation))) { 1166 warning("schedctl behavior undefined when Compiler/VM/GC Threads are Unbound"); 1167 } 1168 ); 1169 1170 1171 // Mark that we don't have an lwp or thread id yet. 1172 // In case we attempt to set the priority before the thread starts. 1173 osthread->set_lwp_id(-1); 1174 osthread->set_thread_id(-1); 1175 1176 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid); 1177 if (status != 0) { 1178 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1179 perror("os::create_thread"); 1180 } 1181 thread->set_osthread(NULL); 1182 // Need to clean up stuff we've allocated so far 1183 delete osthread; 1184 return false; 1185 } 1186 1187 Atomic::inc(&os::Solaris::_os_thread_count); 1188 1189 // Store info on the Solaris thread into the OSThread 1190 osthread->set_thread_id(tid); 1191 1192 // Remember that we created this thread so we can set priority on it 1193 osthread->set_vm_created(); 1194 1195 // Set the default thread priority. If using bound threads, setting 1196 // lwp priority will be delayed until thread start. 1197 set_native_priority(thread, 1198 DefaultThreadPriority == -1 ? 1199 java_to_os_priority[NormPriority] : 1200 DefaultThreadPriority); 1201 1202 // Initial thread state is INITIALIZED, not SUSPENDED 1203 osthread->set_state(INITIALIZED); 1204 1205 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 1206 return true; 1207 } 1208 1209 /* defined for >= Solaris 10. This allows builds on earlier versions 1210 * of Solaris to take advantage of the newly reserved Solaris JVM signals 1211 * With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2 1212 * and -XX:+UseAltSigs does nothing since these should have no conflict 1213 */ 1214 #if !defined(SIGJVM1) 1215 #define SIGJVM1 39 1216 #define SIGJVM2 40 1217 #endif 1218 1219 debug_only(static bool signal_sets_initialized = false); 1220 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 1221 int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL; 1222 int os::Solaris::_SIGasync = ASYNC_SIGNAL; 1223 1224 bool os::Solaris::is_sig_ignored(int sig) { 1225 struct sigaction oact; 1226 sigaction(sig, (struct sigaction*)NULL, &oact); 1227 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 1228 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 1229 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) 1230 return true; 1231 else 1232 return false; 1233 } 1234 1235 // Note: SIGRTMIN is a macro that calls sysconf() so it will 1236 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime 1237 static bool isJVM1available() { 1238 return SIGJVM1 < SIGRTMIN; 1239 } 1240 1241 void os::Solaris::signal_sets_init() { 1242 // Should also have an assertion stating we are still single-threaded. 1243 assert(!signal_sets_initialized, "Already initialized"); 1244 // Fill in signals that are necessarily unblocked for all threads in 1245 // the VM. Currently, we unblock the following signals: 1246 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 1247 // by -Xrs (=ReduceSignalUsage)); 1248 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 1249 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 1250 // the dispositions or masks wrt these signals. 1251 // Programs embedding the VM that want to use the above signals for their 1252 // own purposes must, at this time, use the "-Xrs" option to prevent 1253 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 1254 // (See bug 4345157, and other related bugs). 1255 // In reality, though, unblocking these signals is really a nop, since 1256 // these signals are not blocked by default. 1257 sigemptyset(&unblocked_sigs); 1258 sigemptyset(&allowdebug_blocked_sigs); 1259 sigaddset(&unblocked_sigs, SIGILL); 1260 sigaddset(&unblocked_sigs, SIGSEGV); 1261 sigaddset(&unblocked_sigs, SIGBUS); 1262 sigaddset(&unblocked_sigs, SIGFPE); 1263 1264 if (isJVM1available) { 1265 os::Solaris::set_SIGinterrupt(SIGJVM1); 1266 os::Solaris::set_SIGasync(SIGJVM2); 1267 } else if (UseAltSigs) { 1268 os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL); 1269 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL); 1270 } else { 1271 os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL); 1272 os::Solaris::set_SIGasync(ASYNC_SIGNAL); 1273 } 1274 1275 sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt()); 1276 sigaddset(&unblocked_sigs, os::Solaris::SIGasync()); 1277 1278 if (!ReduceSignalUsage) { 1279 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 1280 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 1281 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 1282 } 1283 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 1284 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 1285 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 1286 } 1287 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 1288 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 1289 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 1290 } 1291 } 1292 // Fill in signals that are blocked by all but the VM thread. 1293 sigemptyset(&vm_sigs); 1294 if (!ReduceSignalUsage) 1295 sigaddset(&vm_sigs, BREAK_SIGNAL); 1296 debug_only(signal_sets_initialized = true); 1297 1298 // For diagnostics only used in run_periodic_checks 1299 sigemptyset(&check_signal_done); 1300 } 1301 1302 // These are signals that are unblocked while a thread is running Java. 1303 // (For some reason, they get blocked by default.) 1304 sigset_t* os::Solaris::unblocked_signals() { 1305 assert(signal_sets_initialized, "Not initialized"); 1306 return &unblocked_sigs; 1307 } 1308 1309 // These are the signals that are blocked while a (non-VM) thread is 1310 // running Java. Only the VM thread handles these signals. 1311 sigset_t* os::Solaris::vm_signals() { 1312 assert(signal_sets_initialized, "Not initialized"); 1313 return &vm_sigs; 1314 } 1315 1316 // These are signals that are blocked during cond_wait to allow debugger in 1317 sigset_t* os::Solaris::allowdebug_blocked_signals() { 1318 assert(signal_sets_initialized, "Not initialized"); 1319 return &allowdebug_blocked_sigs; 1320 } 1321 1322 1323 void _handle_uncaught_cxx_exception() { 1324 VMError err("An uncaught C++ exception"); 1325 err.report_and_die(); 1326 } 1327 1328 1329 // First crack at OS-specific initialization, from inside the new thread. 1330 void os::initialize_thread(Thread* thr) { 1331 int r = thr_main() ; 1332 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ; 1333 if (r) { 1334 JavaThread* jt = (JavaThread *)thr; 1335 assert(jt != NULL,"Sanity check"); 1336 size_t stack_size; 1337 address base = jt->stack_base(); 1338 if (Arguments::created_by_java_launcher()) { 1339 // Use 2MB to allow for Solaris 7 64 bit mode. 1340 stack_size = JavaThread::stack_size_at_create() == 0 1341 ? 2048*K : JavaThread::stack_size_at_create(); 1342 1343 // There are rare cases when we may have already used more than 1344 // the basic stack size allotment before this method is invoked. 1345 // Attempt to allow for a normally sized java_stack. 1346 size_t current_stack_offset = (size_t)(base - (address)&stack_size); 1347 stack_size += ReservedSpace::page_align_size_down(current_stack_offset); 1348 } else { 1349 // 6269555: If we were not created by a Java launcher, i.e. if we are 1350 // running embedded in a native application, treat the primordial thread 1351 // as much like a native attached thread as possible. This means using 1352 // the current stack size from thr_stksegment(), unless it is too large 1353 // to reliably setup guard pages. A reasonable max size is 8MB. 1354 size_t current_size = current_stack_size(); 1355 // This should never happen, but just in case.... 1356 if (current_size == 0) current_size = 2 * K * K; 1357 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size; 1358 } 1359 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());; 1360 stack_size = (size_t)(base - bottom); 1361 1362 assert(stack_size > 0, "Stack size calculation problem"); 1363 1364 if (stack_size > jt->stack_size()) { 1365 NOT_PRODUCT( 1366 struct rlimit limits; 1367 getrlimit(RLIMIT_STACK, &limits); 1368 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur); 1369 assert(size >= jt->stack_size(), "Stack size problem in main thread"); 1370 ) 1371 tty->print_cr( 1372 "Stack size of %d Kb exceeds current limit of %d Kb.\n" 1373 "(Stack sizes are rounded up to a multiple of the system page size.)\n" 1374 "See limit(1) to increase the stack size limit.", 1375 stack_size / K, jt->stack_size() / K); 1376 vm_exit(1); 1377 } 1378 assert(jt->stack_size() >= stack_size, 1379 "Attempt to map more stack than was allocated"); 1380 jt->set_stack_size(stack_size); 1381 } 1382 1383 // 5/22/01: Right now alternate signal stacks do not handle 1384 // throwing stack overflow exceptions, see bug 4463178 1385 // Until a fix is found for this, T2 will NOT imply alternate signal 1386 // stacks. 1387 // If using T2 libthread threads, install an alternate signal stack. 1388 // Because alternate stacks associate with LWPs on Solaris, 1389 // see sigaltstack(2), if using UNBOUND threads, or if UseBoundThreads 1390 // we prefer to explicitly stack bang. 1391 // If not using T2 libthread, but using UseBoundThreads any threads 1392 // (primordial thread, jni_attachCurrentThread) we do not create, 1393 // probably are not bound, therefore they can not have an alternate 1394 // signal stack. Since our stack banging code is generated and 1395 // is shared across threads, all threads must be bound to allow 1396 // using alternate signal stacks. The alternative is to interpose 1397 // on _lwp_create to associate an alt sig stack with each LWP, 1398 // and this could be a problem when the JVM is embedded. 1399 // We would prefer to use alternate signal stacks with T2 1400 // Since there is currently no accurate way to detect T2 1401 // we do not. Assuming T2 when running T1 causes sig 11s or assertions 1402 // on installing alternate signal stacks 1403 1404 1405 // 05/09/03: removed alternate signal stack support for Solaris 1406 // The alternate signal stack mechanism is no longer needed to 1407 // handle stack overflow. This is now handled by allocating 1408 // guard pages (red zone) and stackbanging. 1409 // Initially the alternate signal stack mechanism was removed because 1410 // it did not work with T1 llibthread. Alternate 1411 // signal stacks MUST have all threads bound to lwps. Applications 1412 // can create their own threads and attach them without their being 1413 // bound under T1. This is frequently the case for the primordial thread. 1414 // If we were ever to reenable this mechanism we would need to 1415 // use the dynamic check for T2 libthread. 1416 1417 os::Solaris::init_thread_fpu_state(); 1418 std::set_terminate(_handle_uncaught_cxx_exception); 1419 } 1420 1421 1422 1423 // Free Solaris resources related to the OSThread 1424 void os::free_thread(OSThread* osthread) { 1425 assert(osthread != NULL, "os::free_thread but osthread not set"); 1426 1427 1428 // We are told to free resources of the argument thread, 1429 // but we can only really operate on the current thread. 1430 // The main thread must take the VMThread down synchronously 1431 // before the main thread exits and frees up CodeHeap 1432 guarantee((Thread::current()->osthread() == osthread 1433 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread"); 1434 if (Thread::current()->osthread() == osthread) { 1435 // Restore caller's signal mask 1436 sigset_t sigmask = osthread->caller_sigmask(); 1437 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL); 1438 } 1439 delete osthread; 1440 } 1441 1442 void os::pd_start_thread(Thread* thread) { 1443 int status = thr_continue(thread->osthread()->thread_id()); 1444 assert_status(status == 0, status, "thr_continue failed"); 1445 } 1446 1447 1448 intx os::current_thread_id() { 1449 return (intx)thr_self(); 1450 } 1451 1452 static pid_t _initial_pid = 0; 1453 1454 int os::current_process_id() { 1455 return (int)(_initial_pid ? _initial_pid : getpid()); 1456 } 1457 1458 int os::allocate_thread_local_storage() { 1459 // %%% in Win32 this allocates a memory segment pointed to by a 1460 // register. Dan Stein can implement a similar feature in 1461 // Solaris. Alternatively, the VM can do the same thing 1462 // explicitly: malloc some storage and keep the pointer in a 1463 // register (which is part of the thread's context) (or keep it 1464 // in TLS). 1465 // %%% In current versions of Solaris, thr_self and TSD can 1466 // be accessed via short sequences of displaced indirections. 1467 // The value of thr_self is available as %g7(36). 1468 // The value of thr_getspecific(k) is stored in %g7(12)(4)(k*4-4), 1469 // assuming that the current thread already has a value bound to k. 1470 // It may be worth experimenting with such access patterns, 1471 // and later having the parameters formally exported from a Solaris 1472 // interface. I think, however, that it will be faster to 1473 // maintain the invariant that %g2 always contains the 1474 // JavaThread in Java code, and have stubs simply 1475 // treat %g2 as a caller-save register, preserving it in a %lN. 1476 thread_key_t tk; 1477 if (thr_keycreate( &tk, NULL ) ) 1478 fatal(err_msg("os::allocate_thread_local_storage: thr_keycreate failed " 1479 "(%s)", strerror(errno))); 1480 return int(tk); 1481 } 1482 1483 void os::free_thread_local_storage(int index) { 1484 // %%% don't think we need anything here 1485 // if ( pthread_key_delete((pthread_key_t) tk) ) 1486 // fatal("os::free_thread_local_storage: pthread_key_delete failed"); 1487 } 1488 1489 #define SMALLINT 32 // libthread allocate for tsd_common is a version specific 1490 // small number - point is NO swap space available 1491 void os::thread_local_storage_at_put(int index, void* value) { 1492 // %%% this is used only in threadLocalStorage.cpp 1493 if (thr_setspecific((thread_key_t)index, value)) { 1494 if (errno == ENOMEM) { 1495 vm_exit_out_of_memory(SMALLINT, OOM_MALLOC_ERROR, 1496 "thr_setspecific: out of swap space"); 1497 } else { 1498 fatal(err_msg("os::thread_local_storage_at_put: thr_setspecific failed " 1499 "(%s)", strerror(errno))); 1500 } 1501 } else { 1502 ThreadLocalStorage::set_thread_in_slot ((Thread *) value) ; 1503 } 1504 } 1505 1506 // This function could be called before TLS is initialized, for example, when 1507 // VM receives an async signal or when VM causes a fatal error during 1508 // initialization. Return NULL if thr_getspecific() fails. 1509 void* os::thread_local_storage_at(int index) { 1510 // %%% this is used only in threadLocalStorage.cpp 1511 void* r = NULL; 1512 return thr_getspecific((thread_key_t)index, &r) != 0 ? NULL : r; 1513 } 1514 1515 1516 // gethrtime can move backwards if read from one cpu and then a different cpu 1517 // getTimeNanos is guaranteed to not move backward on Solaris 1518 // local spinloop created as faster for a CAS on an int than 1519 // a CAS on a 64bit jlong. Also Atomic::cmpxchg for jlong is not 1520 // supported on sparc v8 or pre supports_cx8 intel boxes. 1521 // oldgetTimeNanos for systems which do not support CAS on 64bit jlong 1522 // i.e. sparc v8 and pre supports_cx8 (i486) intel boxes 1523 inline hrtime_t oldgetTimeNanos() { 1524 int gotlock = LOCK_INVALID; 1525 hrtime_t newtime = gethrtime(); 1526 1527 for (;;) { 1528 // grab lock for max_hrtime 1529 int curlock = max_hrtime_lock; 1530 if (curlock & LOCK_BUSY) continue; 1531 if (gotlock = Atomic::cmpxchg(LOCK_BUSY, &max_hrtime_lock, LOCK_FREE) != LOCK_FREE) continue; 1532 if (newtime > max_hrtime) { 1533 max_hrtime = newtime; 1534 } else { 1535 newtime = max_hrtime; 1536 } 1537 // release lock 1538 max_hrtime_lock = LOCK_FREE; 1539 return newtime; 1540 } 1541 } 1542 // gethrtime can move backwards if read from one cpu and then a different cpu 1543 // getTimeNanos is guaranteed to not move backward on Solaris 1544 inline hrtime_t getTimeNanos() { 1545 if (VM_Version::supports_cx8()) { 1546 const hrtime_t now = gethrtime(); 1547 // Use atomic long load since 32-bit x86 uses 2 registers to keep long. 1548 const hrtime_t prev = Atomic::load((volatile jlong*)&max_hrtime); 1549 if (now <= prev) return prev; // same or retrograde time; 1550 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev); 1551 assert(obsv >= prev, "invariant"); // Monotonicity 1552 // If the CAS succeeded then we're done and return "now". 1553 // If the CAS failed and the observed value "obs" is >= now then 1554 // we should return "obs". If the CAS failed and now > obs > prv then 1555 // some other thread raced this thread and installed a new value, in which case 1556 // we could either (a) retry the entire operation, (b) retry trying to install now 1557 // or (c) just return obs. We use (c). No loop is required although in some cases 1558 // we might discard a higher "now" value in deference to a slightly lower but freshly 1559 // installed obs value. That's entirely benign -- it admits no new orderings compared 1560 // to (a) or (b) -- and greatly reduces coherence traffic. 1561 // We might also condition (c) on the magnitude of the delta between obs and now. 1562 // Avoiding excessive CAS operations to hot RW locations is critical. 1563 // See http://blogs.sun.com/dave/entry/cas_and_cache_trivia_invalidate 1564 return (prev == obsv) ? now : obsv ; 1565 } else { 1566 return oldgetTimeNanos(); 1567 } 1568 } 1569 1570 // Time since start-up in seconds to a fine granularity. 1571 // Used by VMSelfDestructTimer and the MemProfiler. 1572 double os::elapsedTime() { 1573 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1574 } 1575 1576 jlong os::elapsed_counter() { 1577 return (jlong)(getTimeNanos() - first_hrtime); 1578 } 1579 1580 jlong os::elapsed_frequency() { 1581 return hrtime_hz; 1582 } 1583 1584 // Return the real, user, and system times in seconds from an 1585 // arbitrary fixed point in the past. 1586 bool os::getTimesSecs(double* process_real_time, 1587 double* process_user_time, 1588 double* process_system_time) { 1589 struct tms ticks; 1590 clock_t real_ticks = times(&ticks); 1591 1592 if (real_ticks == (clock_t) (-1)) { 1593 return false; 1594 } else { 1595 double ticks_per_second = (double) clock_tics_per_sec; 1596 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1597 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1598 // For consistency return the real time from getTimeNanos() 1599 // converted to seconds. 1600 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); 1601 1602 return true; 1603 } 1604 } 1605 1606 bool os::supports_vtime() { return true; } 1607 1608 bool os::enable_vtime() { 1609 int fd = ::open("/proc/self/ctl", O_WRONLY); 1610 if (fd == -1) 1611 return false; 1612 1613 long cmd[] = { PCSET, PR_MSACCT }; 1614 int res = ::write(fd, cmd, sizeof(long) * 2); 1615 ::close(fd); 1616 if (res != sizeof(long) * 2) 1617 return false; 1618 1619 return true; 1620 } 1621 1622 bool os::vtime_enabled() { 1623 int fd = ::open("/proc/self/status", O_RDONLY); 1624 if (fd == -1) 1625 return false; 1626 1627 pstatus_t status; 1628 int res = os::read(fd, (void*) &status, sizeof(pstatus_t)); 1629 ::close(fd); 1630 if (res != sizeof(pstatus_t)) 1631 return false; 1632 1633 return status.pr_flags & PR_MSACCT; 1634 } 1635 1636 double os::elapsedVTime() { 1637 return (double)gethrvtime() / (double)hrtime_hz; 1638 } 1639 1640 // Used internally for comparisons only 1641 // getTimeMillis guaranteed to not move backwards on Solaris 1642 jlong getTimeMillis() { 1643 jlong nanotime = getTimeNanos(); 1644 return (jlong)(nanotime / NANOSECS_PER_MILLISEC); 1645 } 1646 1647 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 1648 jlong os::javaTimeMillis() { 1649 timeval t; 1650 if (gettimeofday( &t, NULL) == -1) 1651 fatal(err_msg("os::javaTimeMillis: gettimeofday (%s)", strerror(errno))); 1652 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; 1653 } 1654 1655 jlong os::javaTimeNanos() { 1656 return (jlong)getTimeNanos(); 1657 } 1658 1659 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1660 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits 1661 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1662 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1663 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1664 } 1665 1666 char * os::local_time_string(char *buf, size_t buflen) { 1667 struct tm t; 1668 time_t long_time; 1669 time(&long_time); 1670 localtime_r(&long_time, &t); 1671 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1672 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1673 t.tm_hour, t.tm_min, t.tm_sec); 1674 return buf; 1675 } 1676 1677 // Note: os::shutdown() might be called very early during initialization, or 1678 // called from signal handler. Before adding something to os::shutdown(), make 1679 // sure it is async-safe and can handle partially initialized VM. 1680 void os::shutdown() { 1681 1682 // allow PerfMemory to attempt cleanup of any persistent resources 1683 perfMemory_exit(); 1684 1685 // needs to remove object in file system 1686 AttachListener::abort(); 1687 1688 // flush buffered output, finish log files 1689 ostream_abort(); 1690 1691 // Check for abort hook 1692 abort_hook_t abort_hook = Arguments::abort_hook(); 1693 if (abort_hook != NULL) { 1694 abort_hook(); 1695 } 1696 } 1697 1698 // Note: os::abort() might be called very early during initialization, or 1699 // called from signal handler. Before adding something to os::abort(), make 1700 // sure it is async-safe and can handle partially initialized VM. 1701 void os::abort(bool dump_core) { 1702 os::shutdown(); 1703 if (dump_core) { 1704 #ifndef PRODUCT 1705 fdStream out(defaultStream::output_fd()); 1706 out.print_raw("Current thread is "); 1707 char buf[16]; 1708 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1709 out.print_raw_cr(buf); 1710 out.print_raw_cr("Dumping core ..."); 1711 #endif 1712 ::abort(); // dump core (for debugging) 1713 } 1714 1715 ::exit(1); 1716 } 1717 1718 // Die immediately, no exit hook, no abort hook, no cleanup. 1719 void os::die() { 1720 ::abort(); // dump core (for debugging) 1721 } 1722 1723 // unused 1724 void os::set_error_file(const char *logfile) {} 1725 1726 // DLL functions 1727 1728 const char* os::dll_file_extension() { return ".so"; } 1729 1730 // This must be hard coded because it's the system's temporary 1731 // directory not the java application's temp directory, ala java.io.tmpdir. 1732 const char* os::get_temp_directory() { return "/tmp"; } 1733 1734 static bool file_exists(const char* filename) { 1735 struct stat statbuf; 1736 if (filename == NULL || strlen(filename) == 0) { 1737 return false; 1738 } 1739 return os::stat(filename, &statbuf) == 0; 1740 } 1741 1742 bool os::dll_build_name(char* buffer, size_t buflen, 1743 const char* pname, const char* fname) { 1744 bool retval = false; 1745 const size_t pnamelen = pname ? strlen(pname) : 0; 1746 1747 // Return error on buffer overflow. 1748 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { 1749 return retval; 1750 } 1751 1752 if (pnamelen == 0) { 1753 snprintf(buffer, buflen, "lib%s.so", fname); 1754 retval = true; 1755 } else if (strchr(pname, *os::path_separator()) != NULL) { 1756 int n; 1757 char** pelements = split_path(pname, &n); 1758 if (pelements == NULL) { 1759 return false; 1760 } 1761 for (int i = 0 ; i < n ; i++) { 1762 // really shouldn't be NULL but what the heck, check can't hurt 1763 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1764 continue; // skip the empty path values 1765 } 1766 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); 1767 if (file_exists(buffer)) { 1768 retval = true; 1769 break; 1770 } 1771 } 1772 // release the storage 1773 for (int i = 0 ; i < n ; i++) { 1774 if (pelements[i] != NULL) { 1775 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); 1776 } 1777 } 1778 if (pelements != NULL) { 1779 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); 1780 } 1781 } else { 1782 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); 1783 retval = true; 1784 } 1785 return retval; 1786 } 1787 1788 // check if addr is inside libjvm.so 1789 bool os::address_is_in_vm(address addr) { 1790 static address libjvm_base_addr; 1791 Dl_info dlinfo; 1792 1793 if (libjvm_base_addr == NULL) { 1794 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1795 libjvm_base_addr = (address)dlinfo.dli_fbase; 1796 } 1797 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1798 } 1799 1800 if (dladdr((void *)addr, &dlinfo) != 0) { 1801 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1802 } 1803 1804 return false; 1805 } 1806 1807 typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int); 1808 static dladdr1_func_type dladdr1_func = NULL; 1809 1810 bool os::dll_address_to_function_name(address addr, char *buf, 1811 int buflen, int * offset) { 1812 // buf is not optional, but offset is optional 1813 assert(buf != NULL, "sanity check"); 1814 1815 Dl_info dlinfo; 1816 1817 // dladdr1_func was initialized in os::init() 1818 if (dladdr1_func != NULL) { 1819 // yes, we have dladdr1 1820 1821 // Support for dladdr1 is checked at runtime; it may be 1822 // available even if the vm is built on a machine that does 1823 // not have dladdr1 support. Make sure there is a value for 1824 // RTLD_DL_SYMENT. 1825 #ifndef RTLD_DL_SYMENT 1826 #define RTLD_DL_SYMENT 1 1827 #endif 1828 #ifdef _LP64 1829 Elf64_Sym * info; 1830 #else 1831 Elf32_Sym * info; 1832 #endif 1833 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1834 RTLD_DL_SYMENT) != 0) { 1835 // see if we have a matching symbol that covers our address 1836 if (dlinfo.dli_saddr != NULL && 1837 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) { 1838 if (dlinfo.dli_sname != NULL) { 1839 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { 1840 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1841 } 1842 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1843 return true; 1844 } 1845 } 1846 // no matching symbol so try for just file info 1847 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1848 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1849 buf, buflen, offset, dlinfo.dli_fname)) { 1850 return true; 1851 } 1852 } 1853 } 1854 buf[0] = '\0'; 1855 if (offset != NULL) *offset = -1; 1856 return false; 1857 } 1858 1859 // no, only dladdr is available 1860 if (dladdr((void *)addr, &dlinfo) != 0) { 1861 // see if we have a matching symbol 1862 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1863 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { 1864 jio_snprintf(buf, buflen, dlinfo.dli_sname); 1865 } 1866 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1867 return true; 1868 } 1869 // no matching symbol so try for just file info 1870 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1871 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1872 buf, buflen, offset, dlinfo.dli_fname)) { 1873 return true; 1874 } 1875 } 1876 } 1877 buf[0] = '\0'; 1878 if (offset != NULL) *offset = -1; 1879 return false; 1880 } 1881 1882 bool os::dll_address_to_library_name(address addr, char* buf, 1883 int buflen, int* offset) { 1884 // buf is not optional, but offset is optional 1885 assert(buf != NULL, "sanity check"); 1886 1887 Dl_info dlinfo; 1888 1889 if (dladdr((void*)addr, &dlinfo) != 0) { 1890 if (dlinfo.dli_fname != NULL) { 1891 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1892 } 1893 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1894 *offset = addr - (address)dlinfo.dli_fbase; 1895 } 1896 return true; 1897 } 1898 1899 buf[0] = '\0'; 1900 if (offset) *offset = -1; 1901 return false; 1902 } 1903 1904 // Prints the names and full paths of all opened dynamic libraries 1905 // for current process 1906 void os::print_dll_info(outputStream * st) { 1907 Dl_info dli; 1908 void *handle; 1909 Link_map *map; 1910 Link_map *p; 1911 1912 st->print_cr("Dynamic libraries:"); st->flush(); 1913 1914 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 || 1915 dli.dli_fname == NULL) { 1916 st->print_cr("Error: Cannot print dynamic libraries."); 1917 return; 1918 } 1919 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1920 if (handle == NULL) { 1921 st->print_cr("Error: Cannot print dynamic libraries."); 1922 return; 1923 } 1924 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1925 if (map == NULL) { 1926 st->print_cr("Error: Cannot print dynamic libraries."); 1927 return; 1928 } 1929 1930 while (map->l_prev != NULL) 1931 map = map->l_prev; 1932 1933 while (map != NULL) { 1934 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); 1935 map = map->l_next; 1936 } 1937 1938 dlclose(handle); 1939 } 1940 1941 // Loads .dll/.so and 1942 // in case of error it checks if .dll/.so was built for the 1943 // same architecture as Hotspot is running on 1944 1945 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) 1946 { 1947 void * result= ::dlopen(filename, RTLD_LAZY); 1948 if (result != NULL) { 1949 // Successful loading 1950 return result; 1951 } 1952 1953 Elf32_Ehdr elf_head; 1954 1955 // Read system error message into ebuf 1956 // It may or may not be overwritten below 1957 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1958 ebuf[ebuflen-1]='\0'; 1959 int diag_msg_max_length=ebuflen-strlen(ebuf); 1960 char* diag_msg_buf=ebuf+strlen(ebuf); 1961 1962 if (diag_msg_max_length==0) { 1963 // No more space in ebuf for additional diagnostics message 1964 return NULL; 1965 } 1966 1967 1968 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1969 1970 if (file_descriptor < 0) { 1971 // Can't open library, report dlerror() message 1972 return NULL; 1973 } 1974 1975 bool failed_to_read_elf_head= 1976 (sizeof(elf_head)!= 1977 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; 1978 1979 ::close(file_descriptor); 1980 if (failed_to_read_elf_head) { 1981 // file i/o error - report dlerror() msg 1982 return NULL; 1983 } 1984 1985 typedef struct { 1986 Elf32_Half code; // Actual value as defined in elf.h 1987 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1988 char elf_class; // 32 or 64 bit 1989 char endianess; // MSB or LSB 1990 char* name; // String representation 1991 } arch_t; 1992 1993 static const arch_t arch_array[]={ 1994 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1995 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1996 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1997 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1998 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1999 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 2000 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 2001 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 2002 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 2003 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"} 2004 }; 2005 2006 #if (defined IA32) 2007 static Elf32_Half running_arch_code=EM_386; 2008 #elif (defined AMD64) 2009 static Elf32_Half running_arch_code=EM_X86_64; 2010 #elif (defined IA64) 2011 static Elf32_Half running_arch_code=EM_IA_64; 2012 #elif (defined __sparc) && (defined _LP64) 2013 static Elf32_Half running_arch_code=EM_SPARCV9; 2014 #elif (defined __sparc) && (!defined _LP64) 2015 static Elf32_Half running_arch_code=EM_SPARC; 2016 #elif (defined __powerpc64__) 2017 static Elf32_Half running_arch_code=EM_PPC64; 2018 #elif (defined __powerpc__) 2019 static Elf32_Half running_arch_code=EM_PPC; 2020 #elif (defined ARM) 2021 static Elf32_Half running_arch_code=EM_ARM; 2022 #else 2023 #error Method os::dll_load requires that one of following is defined:\ 2024 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM 2025 #endif 2026 2027 // Identify compatability class for VM's architecture and library's architecture 2028 // Obtain string descriptions for architectures 2029 2030 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 2031 int running_arch_index=-1; 2032 2033 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { 2034 if (running_arch_code == arch_array[i].code) { 2035 running_arch_index = i; 2036 } 2037 if (lib_arch.code == arch_array[i].code) { 2038 lib_arch.compat_class = arch_array[i].compat_class; 2039 lib_arch.name = arch_array[i].name; 2040 } 2041 } 2042 2043 assert(running_arch_index != -1, 2044 "Didn't find running architecture code (running_arch_code) in arch_array"); 2045 if (running_arch_index == -1) { 2046 // Even though running architecture detection failed 2047 // we may still continue with reporting dlerror() message 2048 return NULL; 2049 } 2050 2051 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 2052 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 2053 return NULL; 2054 } 2055 2056 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 2057 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 2058 return NULL; 2059 } 2060 2061 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 2062 if ( lib_arch.name!=NULL ) { 2063 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 2064 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 2065 lib_arch.name, arch_array[running_arch_index].name); 2066 } else { 2067 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 2068 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 2069 lib_arch.code, 2070 arch_array[running_arch_index].name); 2071 } 2072 } 2073 2074 return NULL; 2075 } 2076 2077 void* os::dll_lookup(void* handle, const char* name) { 2078 return dlsym(handle, name); 2079 } 2080 2081 void* os::get_default_process_handle() { 2082 return (void*)::dlopen(NULL, RTLD_LAZY); 2083 } 2084 2085 int os::stat(const char *path, struct stat *sbuf) { 2086 char pathbuf[MAX_PATH]; 2087 if (strlen(path) > MAX_PATH - 1) { 2088 errno = ENAMETOOLONG; 2089 return -1; 2090 } 2091 os::native_path(strcpy(pathbuf, path)); 2092 return ::stat(pathbuf, sbuf); 2093 } 2094 2095 static bool _print_ascii_file(const char* filename, outputStream* st) { 2096 int fd = ::open(filename, O_RDONLY); 2097 if (fd == -1) { 2098 return false; 2099 } 2100 2101 char buf[32]; 2102 int bytes; 2103 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 2104 st->print_raw(buf, bytes); 2105 } 2106 2107 ::close(fd); 2108 2109 return true; 2110 } 2111 2112 void os::print_os_info_brief(outputStream* st) { 2113 os::Solaris::print_distro_info(st); 2114 2115 os::Posix::print_uname_info(st); 2116 2117 os::Solaris::print_libversion_info(st); 2118 } 2119 2120 void os::print_os_info(outputStream* st) { 2121 st->print("OS:"); 2122 2123 os::Solaris::print_distro_info(st); 2124 2125 os::Posix::print_uname_info(st); 2126 2127 os::Solaris::print_libversion_info(st); 2128 2129 os::Posix::print_rlimit_info(st); 2130 2131 os::Posix::print_load_average(st); 2132 } 2133 2134 void os::Solaris::print_distro_info(outputStream* st) { 2135 if (!_print_ascii_file("/etc/release", st)) { 2136 st->print("Solaris"); 2137 } 2138 st->cr(); 2139 } 2140 2141 void os::Solaris::print_libversion_info(outputStream* st) { 2142 if (os::Solaris::T2_libthread()) { 2143 st->print(" (T2 libthread)"); 2144 } 2145 else { 2146 st->print(" (T1 libthread)"); 2147 } 2148 st->cr(); 2149 } 2150 2151 static bool check_addr0(outputStream* st) { 2152 jboolean status = false; 2153 int fd = ::open("/proc/self/map",O_RDONLY); 2154 if (fd >= 0) { 2155 prmap_t p; 2156 while(::read(fd, &p, sizeof(p)) > 0) { 2157 if (p.pr_vaddr == 0x0) { 2158 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname); 2159 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname); 2160 st->print("Access:"); 2161 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-"); 2162 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-"); 2163 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-"); 2164 st->cr(); 2165 status = true; 2166 } 2167 } 2168 ::close(fd); 2169 } 2170 return status; 2171 } 2172 2173 void os::pd_print_cpu_info(outputStream* st) { 2174 // Nothing to do for now. 2175 } 2176 2177 void os::print_memory_info(outputStream* st) { 2178 st->print("Memory:"); 2179 st->print(" %dk page", os::vm_page_size()>>10); 2180 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 2181 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 2182 st->cr(); 2183 (void) check_addr0(st); 2184 } 2185 2186 void os::print_siginfo(outputStream* st, void* siginfo) { 2187 const siginfo_t* si = (const siginfo_t*)siginfo; 2188 2189 os::Posix::print_siginfo_brief(st, si); 2190 2191 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && 2192 UseSharedSpaces) { 2193 FileMapInfo* mapinfo = FileMapInfo::current_info(); 2194 if (mapinfo->is_in_shared_space(si->si_addr)) { 2195 st->print("\n\nError accessing class data sharing archive." \ 2196 " Mapped file inaccessible during execution, " \ 2197 " possible disk/network problem."); 2198 } 2199 } 2200 st->cr(); 2201 } 2202 2203 // Moved from whole group, because we need them here for diagnostic 2204 // prints. 2205 #define OLDMAXSIGNUM 32 2206 static int Maxsignum = 0; 2207 static int *ourSigFlags = NULL; 2208 2209 extern "C" void sigINTRHandler(int, siginfo_t*, void*); 2210 2211 int os::Solaris::get_our_sigflags(int sig) { 2212 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 2213 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 2214 return ourSigFlags[sig]; 2215 } 2216 2217 void os::Solaris::set_our_sigflags(int sig, int flags) { 2218 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 2219 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 2220 ourSigFlags[sig] = flags; 2221 } 2222 2223 2224 static const char* get_signal_handler_name(address handler, 2225 char* buf, int buflen) { 2226 int offset; 2227 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 2228 if (found) { 2229 // skip directory names 2230 const char *p1, *p2; 2231 p1 = buf; 2232 size_t len = strlen(os::file_separator()); 2233 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 2234 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 2235 } else { 2236 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 2237 } 2238 return buf; 2239 } 2240 2241 static void print_signal_handler(outputStream* st, int sig, 2242 char* buf, size_t buflen) { 2243 struct sigaction sa; 2244 2245 sigaction(sig, NULL, &sa); 2246 2247 st->print("%s: ", os::exception_name(sig, buf, buflen)); 2248 2249 address handler = (sa.sa_flags & SA_SIGINFO) 2250 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 2251 : CAST_FROM_FN_PTR(address, sa.sa_handler); 2252 2253 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 2254 st->print("SIG_DFL"); 2255 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 2256 st->print("SIG_IGN"); 2257 } else { 2258 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 2259 } 2260 2261 st->print(", sa_mask[0]="); 2262 os::Posix::print_signal_set_short(st, &sa.sa_mask); 2263 2264 address rh = VMError::get_resetted_sighandler(sig); 2265 // May be, handler was resetted by VMError? 2266 if(rh != NULL) { 2267 handler = rh; 2268 sa.sa_flags = VMError::get_resetted_sigflags(sig); 2269 } 2270 2271 st->print(", sa_flags="); 2272 os::Posix::print_sa_flags(st, sa.sa_flags); 2273 2274 // Check: is it our handler? 2275 if(handler == CAST_FROM_FN_PTR(address, signalHandler) || 2276 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) { 2277 // It is our signal handler 2278 // check for flags 2279 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 2280 st->print( 2281 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 2282 os::Solaris::get_our_sigflags(sig)); 2283 } 2284 } 2285 st->cr(); 2286 } 2287 2288 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 2289 st->print_cr("Signal Handlers:"); 2290 print_signal_handler(st, SIGSEGV, buf, buflen); 2291 print_signal_handler(st, SIGBUS , buf, buflen); 2292 print_signal_handler(st, SIGFPE , buf, buflen); 2293 print_signal_handler(st, SIGPIPE, buf, buflen); 2294 print_signal_handler(st, SIGXFSZ, buf, buflen); 2295 print_signal_handler(st, SIGILL , buf, buflen); 2296 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); 2297 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 2298 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 2299 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 2300 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 2301 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 2302 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen); 2303 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen); 2304 } 2305 2306 static char saved_jvm_path[MAXPATHLEN] = { 0 }; 2307 2308 // Find the full path to the current module, libjvm.so 2309 void os::jvm_path(char *buf, jint buflen) { 2310 // Error checking. 2311 if (buflen < MAXPATHLEN) { 2312 assert(false, "must use a large-enough buffer"); 2313 buf[0] = '\0'; 2314 return; 2315 } 2316 // Lazy resolve the path to current module. 2317 if (saved_jvm_path[0] != 0) { 2318 strcpy(buf, saved_jvm_path); 2319 return; 2320 } 2321 2322 Dl_info dlinfo; 2323 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 2324 assert(ret != 0, "cannot locate libjvm"); 2325 if (ret != 0 && dlinfo.dli_fname != NULL) { 2326 realpath((char *)dlinfo.dli_fname, buf); 2327 } else { 2328 buf[0] = '\0'; 2329 return; 2330 } 2331 2332 if (Arguments::sun_java_launcher_is_altjvm()) { 2333 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 2334 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". 2335 // If "/jre/lib/" appears at the right place in the string, then 2336 // assume we are installed in a JDK and we're done. Otherwise, check 2337 // for a JAVA_HOME environment variable and fix up the path so it 2338 // looks like libjvm.so is installed there (append a fake suffix 2339 // hotspot/libjvm.so). 2340 const char *p = buf + strlen(buf) - 1; 2341 for (int count = 0; p > buf && count < 5; ++count) { 2342 for (--p; p > buf && *p != '/'; --p) 2343 /* empty */ ; 2344 } 2345 2346 if (strncmp(p, "/jre/lib/", 9) != 0) { 2347 // Look for JAVA_HOME in the environment. 2348 char* java_home_var = ::getenv("JAVA_HOME"); 2349 if (java_home_var != NULL && java_home_var[0] != 0) { 2350 char cpu_arch[12]; 2351 char* jrelib_p; 2352 int len; 2353 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 2354 #ifdef _LP64 2355 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9. 2356 if (strcmp(cpu_arch, "sparc") == 0) { 2357 strcat(cpu_arch, "v9"); 2358 } else if (strcmp(cpu_arch, "i386") == 0) { 2359 strcpy(cpu_arch, "amd64"); 2360 } 2361 #endif 2362 // Check the current module name "libjvm.so". 2363 p = strrchr(buf, '/'); 2364 assert(strstr(p, "/libjvm") == p, "invalid library name"); 2365 2366 realpath(java_home_var, buf); 2367 // determine if this is a legacy image or modules image 2368 // modules image doesn't have "jre" subdirectory 2369 len = strlen(buf); 2370 jrelib_p = buf + len; 2371 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); 2372 if (0 != access(buf, F_OK)) { 2373 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); 2374 } 2375 2376 if (0 == access(buf, F_OK)) { 2377 // Use current module name "libjvm.so" 2378 len = strlen(buf); 2379 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 2380 } else { 2381 // Go back to path of .so 2382 realpath((char *)dlinfo.dli_fname, buf); 2383 } 2384 } 2385 } 2386 } 2387 2388 strcpy(saved_jvm_path, buf); 2389 } 2390 2391 2392 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2393 // no prefix required, not even "_" 2394 } 2395 2396 2397 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2398 // no suffix required 2399 } 2400 2401 // This method is a copy of JDK's sysGetLastErrorString 2402 // from src/solaris/hpi/src/system_md.c 2403 2404 size_t os::lasterror(char *buf, size_t len) { 2405 2406 if (errno == 0) return 0; 2407 2408 const char *s = ::strerror(errno); 2409 size_t n = ::strlen(s); 2410 if (n >= len) { 2411 n = len - 1; 2412 } 2413 ::strncpy(buf, s, n); 2414 buf[n] = '\0'; 2415 return n; 2416 } 2417 2418 2419 // sun.misc.Signal 2420 2421 extern "C" { 2422 static void UserHandler(int sig, void *siginfo, void *context) { 2423 // Ctrl-C is pressed during error reporting, likely because the error 2424 // handler fails to abort. Let VM die immediately. 2425 if (sig == SIGINT && is_error_reported()) { 2426 os::die(); 2427 } 2428 2429 os::signal_notify(sig); 2430 // We do not need to reinstate the signal handler each time... 2431 } 2432 } 2433 2434 void* os::user_handler() { 2435 return CAST_FROM_FN_PTR(void*, UserHandler); 2436 } 2437 2438 class Semaphore : public StackObj { 2439 public: 2440 Semaphore(); 2441 ~Semaphore(); 2442 void signal(); 2443 void wait(); 2444 bool trywait(); 2445 bool timedwait(unsigned int sec, int nsec); 2446 private: 2447 sema_t _semaphore; 2448 }; 2449 2450 2451 Semaphore::Semaphore() { 2452 sema_init(&_semaphore, 0, NULL, NULL); 2453 } 2454 2455 Semaphore::~Semaphore() { 2456 sema_destroy(&_semaphore); 2457 } 2458 2459 void Semaphore::signal() { 2460 sema_post(&_semaphore); 2461 } 2462 2463 void Semaphore::wait() { 2464 sema_wait(&_semaphore); 2465 } 2466 2467 bool Semaphore::trywait() { 2468 return sema_trywait(&_semaphore) == 0; 2469 } 2470 2471 bool Semaphore::timedwait(unsigned int sec, int nsec) { 2472 struct timespec ts; 2473 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 2474 2475 while (1) { 2476 int result = sema_timedwait(&_semaphore, &ts); 2477 if (result == 0) { 2478 return true; 2479 } else if (errno == EINTR) { 2480 continue; 2481 } else if (errno == ETIME) { 2482 return false; 2483 } else { 2484 return false; 2485 } 2486 } 2487 } 2488 2489 extern "C" { 2490 typedef void (*sa_handler_t)(int); 2491 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2492 } 2493 2494 void* os::signal(int signal_number, void* handler) { 2495 struct sigaction sigAct, oldSigAct; 2496 sigfillset(&(sigAct.sa_mask)); 2497 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 2498 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2499 2500 if (sigaction(signal_number, &sigAct, &oldSigAct)) 2501 // -1 means registration failed 2502 return (void *)-1; 2503 2504 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2505 } 2506 2507 void os::signal_raise(int signal_number) { 2508 raise(signal_number); 2509 } 2510 2511 /* 2512 * The following code is moved from os.cpp for making this 2513 * code platform specific, which it is by its very nature. 2514 */ 2515 2516 // a counter for each possible signal value 2517 static int Sigexit = 0; 2518 static int Maxlibjsigsigs; 2519 static jint *pending_signals = NULL; 2520 static int *preinstalled_sigs = NULL; 2521 static struct sigaction *chainedsigactions = NULL; 2522 static sema_t sig_sem; 2523 typedef int (*version_getting_t)(); 2524 version_getting_t os::Solaris::get_libjsig_version = NULL; 2525 static int libjsigversion = NULL; 2526 2527 int os::sigexitnum_pd() { 2528 assert(Sigexit > 0, "signal memory not yet initialized"); 2529 return Sigexit; 2530 } 2531 2532 void os::Solaris::init_signal_mem() { 2533 // Initialize signal structures 2534 Maxsignum = SIGRTMAX; 2535 Sigexit = Maxsignum+1; 2536 assert(Maxsignum >0, "Unable to obtain max signal number"); 2537 2538 Maxlibjsigsigs = Maxsignum; 2539 2540 // pending_signals has one int per signal 2541 // The additional signal is for SIGEXIT - exit signal to signal_thread 2542 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); 2543 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 2544 2545 if (UseSignalChaining) { 2546 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 2547 * (Maxsignum + 1), mtInternal); 2548 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 2549 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2550 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 2551 } 2552 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ), mtInternal); 2553 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 2554 } 2555 2556 void os::signal_init_pd() { 2557 int ret; 2558 2559 ret = ::sema_init(&sig_sem, 0, NULL, NULL); 2560 assert(ret == 0, "sema_init() failed"); 2561 } 2562 2563 void os::signal_notify(int signal_number) { 2564 int ret; 2565 2566 Atomic::inc(&pending_signals[signal_number]); 2567 ret = ::sema_post(&sig_sem); 2568 assert(ret == 0, "sema_post() failed"); 2569 } 2570 2571 static int check_pending_signals(bool wait_for_signal) { 2572 int ret; 2573 while (true) { 2574 for (int i = 0; i < Sigexit + 1; i++) { 2575 jint n = pending_signals[i]; 2576 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2577 return i; 2578 } 2579 } 2580 if (!wait_for_signal) { 2581 return -1; 2582 } 2583 JavaThread *thread = JavaThread::current(); 2584 ThreadBlockInVM tbivm(thread); 2585 2586 bool threadIsSuspended; 2587 do { 2588 thread->set_suspend_equivalent(); 2589 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2590 while((ret = ::sema_wait(&sig_sem)) == EINTR) 2591 ; 2592 assert(ret == 0, "sema_wait() failed"); 2593 2594 // were we externally suspended while we were waiting? 2595 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2596 if (threadIsSuspended) { 2597 // 2598 // The semaphore has been incremented, but while we were waiting 2599 // another thread suspended us. We don't want to continue running 2600 // while suspended because that would surprise the thread that 2601 // suspended us. 2602 // 2603 ret = ::sema_post(&sig_sem); 2604 assert(ret == 0, "sema_post() failed"); 2605 2606 thread->java_suspend_self(); 2607 } 2608 } while (threadIsSuspended); 2609 } 2610 } 2611 2612 int os::signal_lookup() { 2613 return check_pending_signals(false); 2614 } 2615 2616 int os::signal_wait() { 2617 return check_pending_signals(true); 2618 } 2619 2620 //////////////////////////////////////////////////////////////////////////////// 2621 // Virtual Memory 2622 2623 static int page_size = -1; 2624 2625 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will 2626 // clear this var if support is not available. 2627 static bool has_map_align = true; 2628 2629 int os::vm_page_size() { 2630 assert(page_size != -1, "must call os::init"); 2631 return page_size; 2632 } 2633 2634 // Solaris allocates memory by pages. 2635 int os::vm_allocation_granularity() { 2636 assert(page_size != -1, "must call os::init"); 2637 return page_size; 2638 } 2639 2640 static bool recoverable_mmap_error(int err) { 2641 // See if the error is one we can let the caller handle. This 2642 // list of errno values comes from the Solaris mmap(2) man page. 2643 switch (err) { 2644 case EBADF: 2645 case EINVAL: 2646 case ENOTSUP: 2647 // let the caller deal with these errors 2648 return true; 2649 2650 default: 2651 // Any remaining errors on this OS can cause our reserved mapping 2652 // to be lost. That can cause confusion where different data 2653 // structures think they have the same memory mapped. The worst 2654 // scenario is if both the VM and a library think they have the 2655 // same memory mapped. 2656 return false; 2657 } 2658 } 2659 2660 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec, 2661 int err) { 2662 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2663 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec, 2664 strerror(err), err); 2665 } 2666 2667 static void warn_fail_commit_memory(char* addr, size_t bytes, 2668 size_t alignment_hint, bool exec, 2669 int err) { 2670 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2671 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes, 2672 alignment_hint, exec, strerror(err), err); 2673 } 2674 2675 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) { 2676 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2677 size_t size = bytes; 2678 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2679 if (res != NULL) { 2680 if (UseNUMAInterleaving) { 2681 numa_make_global(addr, bytes); 2682 } 2683 return 0; 2684 } 2685 2686 int err = errno; // save errno from mmap() call in mmap_chunk() 2687 2688 if (!recoverable_mmap_error(err)) { 2689 warn_fail_commit_memory(addr, bytes, exec, err); 2690 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory."); 2691 } 2692 2693 return err; 2694 } 2695 2696 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 2697 return Solaris::commit_memory_impl(addr, bytes, exec) == 0; 2698 } 2699 2700 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec, 2701 const char* mesg) { 2702 assert(mesg != NULL, "mesg must be specified"); 2703 int err = os::Solaris::commit_memory_impl(addr, bytes, exec); 2704 if (err != 0) { 2705 // the caller wants all commit errors to exit with the specified mesg: 2706 warn_fail_commit_memory(addr, bytes, exec, err); 2707 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg); 2708 } 2709 } 2710 2711 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, 2712 size_t alignment_hint, bool exec) { 2713 int err = Solaris::commit_memory_impl(addr, bytes, exec); 2714 if (err == 0) { 2715 if (UseLargePages && (alignment_hint > (size_t)vm_page_size())) { 2716 // If the large page size has been set and the VM 2717 // is using large pages, use the large page size 2718 // if it is smaller than the alignment hint. This is 2719 // a case where the VM wants to use a larger alignment size 2720 // for its own reasons but still want to use large pages 2721 // (which is what matters to setting the mpss range. 2722 size_t page_size = 0; 2723 if (large_page_size() < alignment_hint) { 2724 assert(UseLargePages, "Expected to be here for large page use only"); 2725 page_size = large_page_size(); 2726 } else { 2727 // If the alignment hint is less than the large page 2728 // size, the VM wants a particular alignment (thus the hint) 2729 // for internal reasons. Try to set the mpss range using 2730 // the alignment_hint. 2731 page_size = alignment_hint; 2732 } 2733 // Since this is a hint, ignore any failures. 2734 (void)Solaris::setup_large_pages(addr, bytes, page_size); 2735 } 2736 } 2737 return err; 2738 } 2739 2740 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2741 bool exec) { 2742 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0; 2743 } 2744 2745 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, 2746 size_t alignment_hint, bool exec, 2747 const char* mesg) { 2748 assert(mesg != NULL, "mesg must be specified"); 2749 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec); 2750 if (err != 0) { 2751 // the caller wants all commit errors to exit with the specified mesg: 2752 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err); 2753 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg); 2754 } 2755 } 2756 2757 // Uncommit the pages in a specified region. 2758 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { 2759 if (madvise(addr, bytes, MADV_FREE) < 0) { 2760 debug_only(warning("MADV_FREE failed.")); 2761 return; 2762 } 2763 } 2764 2765 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2766 return os::commit_memory(addr, size, !ExecMem); 2767 } 2768 2769 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2770 return os::uncommit_memory(addr, size); 2771 } 2772 2773 // Change the page size in a given range. 2774 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2775 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2776 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2777 if (UseLargePages) { 2778 Solaris::setup_large_pages(addr, bytes, alignment_hint); 2779 } 2780 } 2781 2782 // Tell the OS to make the range local to the first-touching LWP 2783 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2784 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2785 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2786 debug_only(warning("MADV_ACCESS_LWP failed.")); 2787 } 2788 } 2789 2790 // Tell the OS that this range would be accessed from different LWPs. 2791 void os::numa_make_global(char *addr, size_t bytes) { 2792 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2793 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2794 debug_only(warning("MADV_ACCESS_MANY failed.")); 2795 } 2796 } 2797 2798 // Get the number of the locality groups. 2799 size_t os::numa_get_groups_num() { 2800 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2801 return n != -1 ? n : 1; 2802 } 2803 2804 // Get a list of leaf locality groups. A leaf lgroup is group that 2805 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2806 // board. An LWP is assigned to one of these groups upon creation. 2807 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2808 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2809 ids[0] = 0; 2810 return 1; 2811 } 2812 int result_size = 0, top = 1, bottom = 0, cur = 0; 2813 for (int k = 0; k < size; k++) { 2814 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2815 (Solaris::lgrp_id_t*)&ids[top], size - top); 2816 if (r == -1) { 2817 ids[0] = 0; 2818 return 1; 2819 } 2820 if (!r) { 2821 // That's a leaf node. 2822 assert (bottom <= cur, "Sanity check"); 2823 // Check if the node has memory 2824 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2825 NULL, 0, LGRP_RSRC_MEM) > 0) { 2826 ids[bottom++] = ids[cur]; 2827 } 2828 } 2829 top += r; 2830 cur++; 2831 } 2832 if (bottom == 0) { 2833 // Handle a situation, when the OS reports no memory available. 2834 // Assume UMA architecture. 2835 ids[0] = 0; 2836 return 1; 2837 } 2838 return bottom; 2839 } 2840 2841 // Detect the topology change. Typically happens during CPU plugging-unplugging. 2842 bool os::numa_topology_changed() { 2843 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2844 if (is_stale != -1 && is_stale) { 2845 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2846 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2847 assert(c != 0, "Failure to initialize LGRP API"); 2848 Solaris::set_lgrp_cookie(c); 2849 return true; 2850 } 2851 return false; 2852 } 2853 2854 // Get the group id of the current LWP. 2855 int os::numa_get_group_id() { 2856 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2857 if (lgrp_id == -1) { 2858 return 0; 2859 } 2860 const int size = os::numa_get_groups_num(); 2861 int *ids = (int*)alloca(size * sizeof(int)); 2862 2863 // Get the ids of all lgroups with memory; r is the count. 2864 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2865 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2866 if (r <= 0) { 2867 return 0; 2868 } 2869 return ids[os::random() % r]; 2870 } 2871 2872 // Request information about the page. 2873 bool os::get_page_info(char *start, page_info* info) { 2874 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2875 uint64_t addr = (uintptr_t)start; 2876 uint64_t outdata[2]; 2877 uint_t validity = 0; 2878 2879 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2880 return false; 2881 } 2882 2883 info->size = 0; 2884 info->lgrp_id = -1; 2885 2886 if ((validity & 1) != 0) { 2887 if ((validity & 2) != 0) { 2888 info->lgrp_id = outdata[0]; 2889 } 2890 if ((validity & 4) != 0) { 2891 info->size = outdata[1]; 2892 } 2893 return true; 2894 } 2895 return false; 2896 } 2897 2898 // Scan the pages from start to end until a page different than 2899 // the one described in the info parameter is encountered. 2900 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2901 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2902 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2903 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1]; 2904 uint_t validity[MAX_MEMINFO_CNT]; 2905 2906 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2907 uint64_t p = (uint64_t)start; 2908 while (p < (uint64_t)end) { 2909 addrs[0] = p; 2910 size_t addrs_count = 1; 2911 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { 2912 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2913 addrs_count++; 2914 } 2915 2916 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2917 return NULL; 2918 } 2919 2920 size_t i = 0; 2921 for (; i < addrs_count; i++) { 2922 if ((validity[i] & 1) != 0) { 2923 if ((validity[i] & 4) != 0) { 2924 if (outdata[types * i + 1] != page_expected->size) { 2925 break; 2926 } 2927 } else 2928 if (page_expected->size != 0) { 2929 break; 2930 } 2931 2932 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2933 if (outdata[types * i] != page_expected->lgrp_id) { 2934 break; 2935 } 2936 } 2937 } else { 2938 return NULL; 2939 } 2940 } 2941 2942 if (i < addrs_count) { 2943 if ((validity[i] & 2) != 0) { 2944 page_found->lgrp_id = outdata[types * i]; 2945 } else { 2946 page_found->lgrp_id = -1; 2947 } 2948 if ((validity[i] & 4) != 0) { 2949 page_found->size = outdata[types * i + 1]; 2950 } else { 2951 page_found->size = 0; 2952 } 2953 return (char*)addrs[i]; 2954 } 2955 2956 p = addrs[addrs_count - 1] + page_size; 2957 } 2958 return end; 2959 } 2960 2961 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 2962 size_t size = bytes; 2963 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2964 // uncommitted page. Otherwise, the read/write might succeed if we 2965 // have enough swap space to back the physical page. 2966 return 2967 NULL != Solaris::mmap_chunk(addr, size, 2968 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2969 PROT_NONE); 2970 } 2971 2972 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2973 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2974 2975 if (b == MAP_FAILED) { 2976 return NULL; 2977 } 2978 return b; 2979 } 2980 2981 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) { 2982 char* addr = requested_addr; 2983 int flags = MAP_PRIVATE | MAP_NORESERVE; 2984 2985 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap"); 2986 2987 if (fixed) { 2988 flags |= MAP_FIXED; 2989 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) { 2990 flags |= MAP_ALIGN; 2991 addr = (char*) alignment_hint; 2992 } 2993 2994 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2995 // uncommitted page. Otherwise, the read/write might succeed if we 2996 // have enough swap space to back the physical page. 2997 return mmap_chunk(addr, bytes, flags, PROT_NONE); 2998 } 2999 3000 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { 3001 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL)); 3002 3003 guarantee(requested_addr == NULL || requested_addr == addr, 3004 "OS failed to return requested mmap address."); 3005 return addr; 3006 } 3007 3008 // Reserve memory at an arbitrary address, only if that area is 3009 // available (and not reserved for something else). 3010 3011 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3012 const int max_tries = 10; 3013 char* base[max_tries]; 3014 size_t size[max_tries]; 3015 3016 // Solaris adds a gap between mmap'ed regions. The size of the gap 3017 // is dependent on the requested size and the MMU. Our initial gap 3018 // value here is just a guess and will be corrected later. 3019 bool had_top_overlap = false; 3020 bool have_adjusted_gap = false; 3021 size_t gap = 0x400000; 3022 3023 // Assert only that the size is a multiple of the page size, since 3024 // that's all that mmap requires, and since that's all we really know 3025 // about at this low abstraction level. If we need higher alignment, 3026 // we can either pass an alignment to this method or verify alignment 3027 // in one of the methods further up the call chain. See bug 5044738. 3028 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 3029 3030 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 3031 // Give it a try, if the kernel honors the hint we can return immediately. 3032 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 3033 3034 volatile int err = errno; 3035 if (addr == requested_addr) { 3036 return addr; 3037 } else if (addr != NULL) { 3038 pd_unmap_memory(addr, bytes); 3039 } 3040 3041 if (PrintMiscellaneous && Verbose) { 3042 char buf[256]; 3043 buf[0] = '\0'; 3044 if (addr == NULL) { 3045 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err)); 3046 } 3047 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at " 3048 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT 3049 "%s", bytes, requested_addr, addr, buf); 3050 } 3051 3052 // Address hint method didn't work. Fall back to the old method. 3053 // In theory, once SNV becomes our oldest supported platform, this 3054 // code will no longer be needed. 3055 // 3056 // Repeatedly allocate blocks until the block is allocated at the 3057 // right spot. Give up after max_tries. 3058 int i; 3059 for (i = 0; i < max_tries; ++i) { 3060 base[i] = reserve_memory(bytes); 3061 3062 if (base[i] != NULL) { 3063 // Is this the block we wanted? 3064 if (base[i] == requested_addr) { 3065 size[i] = bytes; 3066 break; 3067 } 3068 3069 // check that the gap value is right 3070 if (had_top_overlap && !have_adjusted_gap) { 3071 size_t actual_gap = base[i-1] - base[i] - bytes; 3072 if (gap != actual_gap) { 3073 // adjust the gap value and retry the last 2 allocations 3074 assert(i > 0, "gap adjustment code problem"); 3075 have_adjusted_gap = true; // adjust the gap only once, just in case 3076 gap = actual_gap; 3077 if (PrintMiscellaneous && Verbose) { 3078 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap); 3079 } 3080 unmap_memory(base[i], bytes); 3081 unmap_memory(base[i-1], size[i-1]); 3082 i-=2; 3083 continue; 3084 } 3085 } 3086 3087 // Does this overlap the block we wanted? Give back the overlapped 3088 // parts and try again. 3089 // 3090 // There is still a bug in this code: if top_overlap == bytes, 3091 // the overlap is offset from requested region by the value of gap. 3092 // In this case giving back the overlapped part will not work, 3093 // because we'll give back the entire block at base[i] and 3094 // therefore the subsequent allocation will not generate a new gap. 3095 // This could be fixed with a new algorithm that used larger 3096 // or variable size chunks to find the requested region - 3097 // but such a change would introduce additional complications. 3098 // It's rare enough that the planets align for this bug, 3099 // so we'll just wait for a fix for 6204603/5003415 which 3100 // will provide a mmap flag to allow us to avoid this business. 3101 3102 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 3103 if (top_overlap >= 0 && top_overlap < bytes) { 3104 had_top_overlap = true; 3105 unmap_memory(base[i], top_overlap); 3106 base[i] += top_overlap; 3107 size[i] = bytes - top_overlap; 3108 } else { 3109 size_t bottom_overlap = base[i] + bytes - requested_addr; 3110 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 3111 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) { 3112 warning("attempt_reserve_memory_at: possible alignment bug"); 3113 } 3114 unmap_memory(requested_addr, bottom_overlap); 3115 size[i] = bytes - bottom_overlap; 3116 } else { 3117 size[i] = bytes; 3118 } 3119 } 3120 } 3121 } 3122 3123 // Give back the unused reserved pieces. 3124 3125 for (int j = 0; j < i; ++j) { 3126 if (base[j] != NULL) { 3127 unmap_memory(base[j], size[j]); 3128 } 3129 } 3130 3131 return (i < max_tries) ? requested_addr : NULL; 3132 } 3133 3134 bool os::pd_release_memory(char* addr, size_t bytes) { 3135 size_t size = bytes; 3136 return munmap(addr, size) == 0; 3137 } 3138 3139 static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 3140 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()), 3141 "addr must be page aligned"); 3142 int retVal = mprotect(addr, bytes, prot); 3143 return retVal == 0; 3144 } 3145 3146 // Protect memory (Used to pass readonly pages through 3147 // JNI GetArray<type>Elements with empty arrays.) 3148 // Also, used for serialization page and for compressed oops null pointer 3149 // checking. 3150 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3151 bool is_committed) { 3152 unsigned int p = 0; 3153 switch (prot) { 3154 case MEM_PROT_NONE: p = PROT_NONE; break; 3155 case MEM_PROT_READ: p = PROT_READ; break; 3156 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 3157 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 3158 default: 3159 ShouldNotReachHere(); 3160 } 3161 // is_committed is unused. 3162 return solaris_mprotect(addr, bytes, p); 3163 } 3164 3165 // guard_memory and unguard_memory only happens within stack guard pages. 3166 // Since ISM pertains only to the heap, guard and unguard memory should not 3167 /// happen with an ISM region. 3168 bool os::guard_memory(char* addr, size_t bytes) { 3169 return solaris_mprotect(addr, bytes, PROT_NONE); 3170 } 3171 3172 bool os::unguard_memory(char* addr, size_t bytes) { 3173 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 3174 } 3175 3176 // Large page support 3177 static size_t _large_page_size = 0; 3178 3179 // Insertion sort for small arrays (descending order). 3180 static void insertion_sort_descending(size_t* array, int len) { 3181 for (int i = 0; i < len; i++) { 3182 size_t val = array[i]; 3183 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 3184 size_t tmp = array[key]; 3185 array[key] = array[key - 1]; 3186 array[key - 1] = tmp; 3187 } 3188 } 3189 } 3190 3191 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) { 3192 const unsigned int usable_count = VM_Version::page_size_count(); 3193 if (usable_count == 1) { 3194 return false; 3195 } 3196 3197 // Find the right getpagesizes interface. When solaris 11 is the minimum 3198 // build platform, getpagesizes() (without the '2') can be called directly. 3199 typedef int (*gps_t)(size_t[], int); 3200 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); 3201 if (gps_func == NULL) { 3202 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); 3203 if (gps_func == NULL) { 3204 if (warn) { 3205 warning("MPSS is not supported by the operating system."); 3206 } 3207 return false; 3208 } 3209 } 3210 3211 // Fill the array of page sizes. 3212 int n = (*gps_func)(_page_sizes, page_sizes_max); 3213 assert(n > 0, "Solaris bug?"); 3214 3215 if (n == page_sizes_max) { 3216 // Add a sentinel value (necessary only if the array was completely filled 3217 // since it is static (zeroed at initialization)). 3218 _page_sizes[--n] = 0; 3219 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 3220 } 3221 assert(_page_sizes[n] == 0, "missing sentinel"); 3222 trace_page_sizes("available page sizes", _page_sizes, n); 3223 3224 if (n == 1) return false; // Only one page size available. 3225 3226 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 3227 // select up to usable_count elements. First sort the array, find the first 3228 // acceptable value, then copy the usable sizes to the top of the array and 3229 // trim the rest. Make sure to include the default page size :-). 3230 // 3231 // A better policy could get rid of the 4M limit by taking the sizes of the 3232 // important VM memory regions (java heap and possibly the code cache) into 3233 // account. 3234 insertion_sort_descending(_page_sizes, n); 3235 const size_t size_limit = 3236 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 3237 int beg; 3238 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ; 3239 const int end = MIN2((int)usable_count, n) - 1; 3240 for (int cur = 0; cur < end; ++cur, ++beg) { 3241 _page_sizes[cur] = _page_sizes[beg]; 3242 } 3243 _page_sizes[end] = vm_page_size(); 3244 _page_sizes[end + 1] = 0; 3245 3246 if (_page_sizes[end] > _page_sizes[end - 1]) { 3247 // Default page size is not the smallest; sort again. 3248 insertion_sort_descending(_page_sizes, end + 1); 3249 } 3250 *page_size = _page_sizes[0]; 3251 3252 trace_page_sizes("usable page sizes", _page_sizes, end + 1); 3253 return true; 3254 } 3255 3256 void os::large_page_init() { 3257 if (UseLargePages) { 3258 // print a warning if any large page related flag is specified on command line 3259 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 3260 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 3261 3262 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 3263 } 3264 } 3265 3266 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) { 3267 // Signal to OS that we want large pages for addresses 3268 // from addr, addr + bytes 3269 struct memcntl_mha mpss_struct; 3270 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 3271 mpss_struct.mha_pagesize = align; 3272 mpss_struct.mha_flags = 0; 3273 // Upon successful completion, memcntl() returns 0 3274 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) { 3275 debug_only(warning("Attempt to use MPSS failed.")); 3276 return false; 3277 } 3278 return true; 3279 } 3280 3281 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) { 3282 fatal("os::reserve_memory_special should not be called on Solaris."); 3283 return NULL; 3284 } 3285 3286 bool os::release_memory_special(char* base, size_t bytes) { 3287 fatal("os::release_memory_special should not be called on Solaris."); 3288 return false; 3289 } 3290 3291 size_t os::large_page_size() { 3292 return _large_page_size; 3293 } 3294 3295 // MPSS allows application to commit large page memory on demand; with ISM 3296 // the entire memory region must be allocated as shared memory. 3297 bool os::can_commit_large_page_memory() { 3298 return true; 3299 } 3300 3301 bool os::can_execute_large_page_memory() { 3302 return true; 3303 } 3304 3305 // Read calls from inside the vm need to perform state transitions 3306 size_t os::read(int fd, void *buf, unsigned int nBytes) { 3307 size_t res; 3308 JavaThread* thread = (JavaThread*)Thread::current(); 3309 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 3310 ThreadBlockInVM tbiv(thread); 3311 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 3312 return res; 3313 } 3314 3315 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) { 3316 size_t res; 3317 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 3318 "Assumed _thread_in_native"); 3319 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 3320 return res; 3321 } 3322 3323 void os::naked_short_sleep(jlong ms) { 3324 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3325 3326 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but 3327 // Solaris requires -lrt for this. 3328 usleep((ms * 1000)); 3329 3330 return; 3331 } 3332 3333 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3334 void os::infinite_sleep() { 3335 while (true) { // sleep forever ... 3336 ::sleep(100); // ... 100 seconds at a time 3337 } 3338 } 3339 3340 // Used to convert frequent JVM_Yield() to nops 3341 bool os::dont_yield() { 3342 if (DontYieldALot) { 3343 static hrtime_t last_time = 0; 3344 hrtime_t diff = getTimeNanos() - last_time; 3345 3346 if (diff < DontYieldALotInterval * 1000000) 3347 return true; 3348 3349 last_time += diff; 3350 3351 return false; 3352 } 3353 else { 3354 return false; 3355 } 3356 } 3357 3358 // Caveat: Solaris os::yield() causes a thread-state transition whereas 3359 // the linux and win32 implementations do not. This should be checked. 3360 3361 void os::yield() { 3362 // Yields to all threads with same or greater priority 3363 os::sleep(Thread::current(), 0, false); 3364 } 3365 3366 // Note that yield semantics are defined by the scheduling class to which 3367 // the thread currently belongs. Typically, yield will _not yield to 3368 // other equal or higher priority threads that reside on the dispatch queues 3369 // of other CPUs. 3370 3371 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; } 3372 3373 3374 // On Solaris we found that yield_all doesn't always yield to all other threads. 3375 // There have been cases where there is a thread ready to execute but it doesn't 3376 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond. 3377 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a 3378 // SIGWAITING signal which will cause a new lwp to be created. So we count the 3379 // number of times yield_all is called in the one loop and increase the sleep 3380 // time after 8 attempts. If this fails too we increase the concurrency level 3381 // so that the starving thread would get an lwp 3382 3383 void os::yield_all(int attempts) { 3384 // Yields to all threads, including threads with lower priorities 3385 if (attempts == 0) { 3386 os::sleep(Thread::current(), 1, false); 3387 } else { 3388 int iterations = attempts % 30; 3389 if (iterations == 0 && !os::Solaris::T2_libthread()) { 3390 // thr_setconcurrency and _getconcurrency make sense only under T1. 3391 int noofLWPS = thr_getconcurrency(); 3392 if (noofLWPS < (Threads::number_of_threads() + 2)) { 3393 thr_setconcurrency(thr_getconcurrency() + 1); 3394 } 3395 } else if (iterations < 25) { 3396 os::sleep(Thread::current(), 1, false); 3397 } else { 3398 os::sleep(Thread::current(), 10, false); 3399 } 3400 } 3401 } 3402 3403 // Called from the tight loops to possibly influence time-sharing heuristics 3404 void os::loop_breaker(int attempts) { 3405 os::yield_all(attempts); 3406 } 3407 3408 3409 // Interface for setting lwp priorities. If we are using T2 libthread, 3410 // which forces the use of BoundThreads or we manually set UseBoundThreads, 3411 // all of our threads will be assigned to real lwp's. Using the thr_setprio 3412 // function is meaningless in this mode so we must adjust the real lwp's priority 3413 // The routines below implement the getting and setting of lwp priorities. 3414 // 3415 // Note: There are three priority scales used on Solaris. Java priotities 3416 // which range from 1 to 10, libthread "thr_setprio" scale which range 3417 // from 0 to 127, and the current scheduling class of the process we 3418 // are running in. This is typically from -60 to +60. 3419 // The setting of the lwp priorities in done after a call to thr_setprio 3420 // so Java priorities are mapped to libthread priorities and we map from 3421 // the latter to lwp priorities. We don't keep priorities stored in 3422 // Java priorities since some of our worker threads want to set priorities 3423 // higher than all Java threads. 3424 // 3425 // For related information: 3426 // (1) man -s 2 priocntl 3427 // (2) man -s 4 priocntl 3428 // (3) man dispadmin 3429 // = librt.so 3430 // = libthread/common/rtsched.c - thrp_setlwpprio(). 3431 // = ps -cL <pid> ... to validate priority. 3432 // = sched_get_priority_min and _max 3433 // pthread_create 3434 // sched_setparam 3435 // pthread_setschedparam 3436 // 3437 // Assumptions: 3438 // + We assume that all threads in the process belong to the same 3439 // scheduling class. IE. an homogenous process. 3440 // + Must be root or in IA group to change change "interactive" attribute. 3441 // Priocntl() will fail silently. The only indication of failure is when 3442 // we read-back the value and notice that it hasn't changed. 3443 // + Interactive threads enter the runq at the head, non-interactive at the tail. 3444 // + For RT, change timeslice as well. Invariant: 3445 // constant "priority integral" 3446 // Konst == TimeSlice * (60-Priority) 3447 // Given a priority, compute appropriate timeslice. 3448 // + Higher numerical values have higher priority. 3449 3450 // sched class attributes 3451 typedef struct { 3452 int schedPolicy; // classID 3453 int maxPrio; 3454 int minPrio; 3455 } SchedInfo; 3456 3457 3458 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; 3459 3460 #ifdef ASSERT 3461 static int ReadBackValidate = 1; 3462 #endif 3463 static int myClass = 0; 3464 static int myMin = 0; 3465 static int myMax = 0; 3466 static int myCur = 0; 3467 static bool priocntl_enable = false; 3468 3469 static const int criticalPrio = 60; // FX/60 is critical thread class/priority on T4 3470 static int java_MaxPriority_to_os_priority = 0; // Saved mapping 3471 3472 3473 // lwp_priocntl_init 3474 // 3475 // Try to determine the priority scale for our process. 3476 // 3477 // Return errno or 0 if OK. 3478 // 3479 static int lwp_priocntl_init () { 3480 int rslt; 3481 pcinfo_t ClassInfo; 3482 pcparms_t ParmInfo; 3483 int i; 3484 3485 if (!UseThreadPriorities) return 0; 3486 3487 // We are using Bound threads, we need to determine our priority ranges 3488 if (os::Solaris::T2_libthread() || UseBoundThreads) { 3489 // If ThreadPriorityPolicy is 1, switch tables 3490 if (ThreadPriorityPolicy == 1) { 3491 for (i = 0 ; i < CriticalPriority+1; i++) 3492 os::java_to_os_priority[i] = prio_policy1[i]; 3493 } 3494 if (UseCriticalJavaThreadPriority) { 3495 // MaxPriority always maps to the FX scheduling class and criticalPrio. 3496 // See set_native_priority() and set_lwp_class_and_priority(). 3497 // Save original MaxPriority mapping in case attempt to 3498 // use critical priority fails. 3499 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; 3500 // Set negative to distinguish from other priorities 3501 os::java_to_os_priority[MaxPriority] = -criticalPrio; 3502 } 3503 } 3504 // Not using Bound Threads, set to ThreadPolicy 1 3505 else { 3506 for ( i = 0 ; i < CriticalPriority+1; i++ ) { 3507 os::java_to_os_priority[i] = prio_policy1[i]; 3508 } 3509 return 0; 3510 } 3511 3512 // Get IDs for a set of well-known scheduling classes. 3513 // TODO-FIXME: GETCLINFO returns the current # of classes in the 3514 // the system. We should have a loop that iterates over the 3515 // classID values, which are known to be "small" integers. 3516 3517 strcpy(ClassInfo.pc_clname, "TS"); 3518 ClassInfo.pc_cid = -1; 3519 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3520 if (rslt < 0) return errno; 3521 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 3522 tsLimits.schedPolicy = ClassInfo.pc_cid; 3523 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 3524 tsLimits.minPrio = -tsLimits.maxPrio; 3525 3526 strcpy(ClassInfo.pc_clname, "IA"); 3527 ClassInfo.pc_cid = -1; 3528 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3529 if (rslt < 0) return errno; 3530 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 3531 iaLimits.schedPolicy = ClassInfo.pc_cid; 3532 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 3533 iaLimits.minPrio = -iaLimits.maxPrio; 3534 3535 strcpy(ClassInfo.pc_clname, "RT"); 3536 ClassInfo.pc_cid = -1; 3537 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3538 if (rslt < 0) return errno; 3539 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 3540 rtLimits.schedPolicy = ClassInfo.pc_cid; 3541 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 3542 rtLimits.minPrio = 0; 3543 3544 strcpy(ClassInfo.pc_clname, "FX"); 3545 ClassInfo.pc_cid = -1; 3546 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3547 if (rslt < 0) return errno; 3548 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); 3549 fxLimits.schedPolicy = ClassInfo.pc_cid; 3550 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; 3551 fxLimits.minPrio = 0; 3552 3553 // Query our "current" scheduling class. 3554 // This will normally be IA, TS or, rarely, FX or RT. 3555 memset(&ParmInfo, 0, sizeof(ParmInfo)); 3556 ParmInfo.pc_cid = PC_CLNULL; 3557 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3558 if (rslt < 0) return errno; 3559 myClass = ParmInfo.pc_cid; 3560 3561 // We now know our scheduling classId, get specific information 3562 // about the class. 3563 ClassInfo.pc_cid = myClass; 3564 ClassInfo.pc_clname[0] = 0; 3565 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); 3566 if (rslt < 0) return errno; 3567 3568 if (ThreadPriorityVerbose) { 3569 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 3570 } 3571 3572 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3573 ParmInfo.pc_cid = PC_CLNULL; 3574 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3575 if (rslt < 0) return errno; 3576 3577 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3578 myMin = rtLimits.minPrio; 3579 myMax = rtLimits.maxPrio; 3580 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3581 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3582 myMin = iaLimits.minPrio; 3583 myMax = iaLimits.maxPrio; 3584 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 3585 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3586 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3587 myMin = tsLimits.minPrio; 3588 myMax = tsLimits.maxPrio; 3589 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 3590 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3591 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3592 myMin = fxLimits.minPrio; 3593 myMax = fxLimits.maxPrio; 3594 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict 3595 } else { 3596 // No clue - punt 3597 if (ThreadPriorityVerbose) 3598 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname); 3599 return EINVAL; // no clue, punt 3600 } 3601 3602 if (ThreadPriorityVerbose) { 3603 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax); 3604 } 3605 3606 priocntl_enable = true; // Enable changing priorities 3607 return 0; 3608 } 3609 3610 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 3611 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 3612 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 3613 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) 3614 3615 3616 // scale_to_lwp_priority 3617 // 3618 // Convert from the libthread "thr_setprio" scale to our current 3619 // lwp scheduling class scale. 3620 // 3621 static 3622 int scale_to_lwp_priority (int rMin, int rMax, int x) 3623 { 3624 int v; 3625 3626 if (x == 127) return rMax; // avoid round-down 3627 v = (((x*(rMax-rMin)))/128)+rMin; 3628 return v; 3629 } 3630 3631 3632 // set_lwp_class_and_priority 3633 // 3634 // Set the class and priority of the lwp. This call should only 3635 // be made when using bound threads (T2 threads are bound by default). 3636 // 3637 int set_lwp_class_and_priority(int ThreadID, int lwpid, 3638 int newPrio, int new_class, bool scale) { 3639 int rslt; 3640 int Actual, Expected, prv; 3641 pcparms_t ParmInfo; // for GET-SET 3642 #ifdef ASSERT 3643 pcparms_t ReadBack; // for readback 3644 #endif 3645 3646 // Set priority via PC_GETPARMS, update, PC_SETPARMS 3647 // Query current values. 3648 // TODO: accelerate this by eliminating the PC_GETPARMS call. 3649 // Cache "pcparms_t" in global ParmCache. 3650 // TODO: elide set-to-same-value 3651 3652 // If something went wrong on init, don't change priorities. 3653 if ( !priocntl_enable ) { 3654 if (ThreadPriorityVerbose) 3655 tty->print_cr("Trying to set priority but init failed, ignoring"); 3656 return EINVAL; 3657 } 3658 3659 // If lwp hasn't started yet, just return 3660 // the _start routine will call us again. 3661 if ( lwpid <= 0 ) { 3662 if (ThreadPriorityVerbose) { 3663 tty->print_cr ("deferring the set_lwp_class_and_priority of thread " 3664 INTPTR_FORMAT " to %d, lwpid not set", 3665 ThreadID, newPrio); 3666 } 3667 return 0; 3668 } 3669 3670 if (ThreadPriorityVerbose) { 3671 tty->print_cr ("set_lwp_class_and_priority(" 3672 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 3673 ThreadID, lwpid, newPrio); 3674 } 3675 3676 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3677 ParmInfo.pc_cid = PC_CLNULL; 3678 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 3679 if (rslt < 0) return errno; 3680 3681 int cur_class = ParmInfo.pc_cid; 3682 ParmInfo.pc_cid = (id_t)new_class; 3683 3684 if (new_class == rtLimits.schedPolicy) { 3685 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 3686 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, 3687 rtLimits.maxPrio, newPrio) 3688 : newPrio; 3689 rtInfo->rt_tqsecs = RT_NOCHANGE; 3690 rtInfo->rt_tqnsecs = RT_NOCHANGE; 3691 if (ThreadPriorityVerbose) { 3692 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 3693 } 3694 } else if (new_class == iaLimits.schedPolicy) { 3695 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3696 int maxClamped = MIN2(iaLimits.maxPrio, 3697 cur_class == new_class 3698 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); 3699 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, 3700 maxClamped, newPrio) 3701 : newPrio; 3702 iaInfo->ia_uprilim = cur_class == new_class 3703 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; 3704 iaInfo->ia_mode = IA_NOCHANGE; 3705 if (ThreadPriorityVerbose) { 3706 tty->print_cr("IA: [%d...%d] %d->%d\n", 3707 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 3708 } 3709 } else if (new_class == tsLimits.schedPolicy) { 3710 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3711 int maxClamped = MIN2(tsLimits.maxPrio, 3712 cur_class == new_class 3713 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); 3714 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, 3715 maxClamped, newPrio) 3716 : newPrio; 3717 tsInfo->ts_uprilim = cur_class == new_class 3718 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; 3719 if (ThreadPriorityVerbose) { 3720 tty->print_cr("TS: [%d...%d] %d->%d\n", 3721 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 3722 } 3723 } else if (new_class == fxLimits.schedPolicy) { 3724 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3725 int maxClamped = MIN2(fxLimits.maxPrio, 3726 cur_class == new_class 3727 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); 3728 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, 3729 maxClamped, newPrio) 3730 : newPrio; 3731 fxInfo->fx_uprilim = cur_class == new_class 3732 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; 3733 fxInfo->fx_tqsecs = FX_NOCHANGE; 3734 fxInfo->fx_tqnsecs = FX_NOCHANGE; 3735 if (ThreadPriorityVerbose) { 3736 tty->print_cr("FX: [%d...%d] %d->%d\n", 3737 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); 3738 } 3739 } else { 3740 if (ThreadPriorityVerbose) { 3741 tty->print_cr("Unknown new scheduling class %d\n", new_class); 3742 } 3743 return EINVAL; // no clue, punt 3744 } 3745 3746 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 3747 if (ThreadPriorityVerbose && rslt) { 3748 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 3749 } 3750 if (rslt < 0) return errno; 3751 3752 #ifdef ASSERT 3753 // Sanity check: read back what we just attempted to set. 3754 // In theory it could have changed in the interim ... 3755 // 3756 // The priocntl system call is tricky. 3757 // Sometimes it'll validate the priority value argument and 3758 // return EINVAL if unhappy. At other times it fails silently. 3759 // Readbacks are prudent. 3760 3761 if (!ReadBackValidate) return 0; 3762 3763 memset(&ReadBack, 0, sizeof(pcparms_t)); 3764 ReadBack.pc_cid = PC_CLNULL; 3765 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 3766 assert(rslt >= 0, "priocntl failed"); 3767 Actual = Expected = 0xBAD; 3768 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3769 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3770 Actual = RTPRI(ReadBack)->rt_pri; 3771 Expected = RTPRI(ParmInfo)->rt_pri; 3772 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3773 Actual = IAPRI(ReadBack)->ia_upri; 3774 Expected = IAPRI(ParmInfo)->ia_upri; 3775 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3776 Actual = TSPRI(ReadBack)->ts_upri; 3777 Expected = TSPRI(ParmInfo)->ts_upri; 3778 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3779 Actual = FXPRI(ReadBack)->fx_upri; 3780 Expected = FXPRI(ParmInfo)->fx_upri; 3781 } else { 3782 if (ThreadPriorityVerbose) { 3783 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", 3784 ParmInfo.pc_cid); 3785 } 3786 } 3787 3788 if (Actual != Expected) { 3789 if (ThreadPriorityVerbose) { 3790 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 3791 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 3792 } 3793 } 3794 #endif 3795 3796 return 0; 3797 } 3798 3799 // Solaris only gives access to 128 real priorities at a time, 3800 // so we expand Java's ten to fill this range. This would be better 3801 // if we dynamically adjusted relative priorities. 3802 // 3803 // The ThreadPriorityPolicy option allows us to select 2 different 3804 // priority scales. 3805 // 3806 // ThreadPriorityPolicy=0 3807 // Since the Solaris' default priority is MaximumPriority, we do not 3808 // set a priority lower than Max unless a priority lower than 3809 // NormPriority is requested. 3810 // 3811 // ThreadPriorityPolicy=1 3812 // This mode causes the priority table to get filled with 3813 // linear values. NormPriority get's mapped to 50% of the 3814 // Maximum priority an so on. This will cause VM threads 3815 // to get unfair treatment against other Solaris processes 3816 // which do not explicitly alter their thread priorities. 3817 // 3818 3819 int os::java_to_os_priority[CriticalPriority + 1] = { 3820 -99999, // 0 Entry should never be used 3821 3822 0, // 1 MinPriority 3823 32, // 2 3824 64, // 3 3825 3826 96, // 4 3827 127, // 5 NormPriority 3828 127, // 6 3829 3830 127, // 7 3831 127, // 8 3832 127, // 9 NearMaxPriority 3833 3834 127, // 10 MaxPriority 3835 3836 -criticalPrio // 11 CriticalPriority 3837 }; 3838 3839 OSReturn os::set_native_priority(Thread* thread, int newpri) { 3840 OSThread* osthread = thread->osthread(); 3841 3842 // Save requested priority in case the thread hasn't been started 3843 osthread->set_native_priority(newpri); 3844 3845 // Check for critical priority request 3846 bool fxcritical = false; 3847 if (newpri == -criticalPrio) { 3848 fxcritical = true; 3849 newpri = criticalPrio; 3850 } 3851 3852 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 3853 if (!UseThreadPriorities) return OS_OK; 3854 3855 int status = 0; 3856 3857 if (!fxcritical) { 3858 // Use thr_setprio only if we have a priority that thr_setprio understands 3859 status = thr_setprio(thread->osthread()->thread_id(), newpri); 3860 } 3861 3862 if (os::Solaris::T2_libthread() || 3863 (UseBoundThreads && osthread->is_vm_created())) { 3864 int lwp_status = 3865 set_lwp_class_and_priority(osthread->thread_id(), 3866 osthread->lwp_id(), 3867 newpri, 3868 fxcritical ? fxLimits.schedPolicy : myClass, 3869 !fxcritical); 3870 if (lwp_status != 0 && fxcritical) { 3871 // Try again, this time without changing the scheduling class 3872 newpri = java_MaxPriority_to_os_priority; 3873 lwp_status = set_lwp_class_and_priority(osthread->thread_id(), 3874 osthread->lwp_id(), 3875 newpri, myClass, false); 3876 } 3877 status |= lwp_status; 3878 } 3879 return (status == 0) ? OS_OK : OS_ERR; 3880 } 3881 3882 3883 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 3884 int p; 3885 if ( !UseThreadPriorities ) { 3886 *priority_ptr = NormalPriority; 3887 return OS_OK; 3888 } 3889 int status = thr_getprio(thread->osthread()->thread_id(), &p); 3890 if (status != 0) { 3891 return OS_ERR; 3892 } 3893 *priority_ptr = p; 3894 return OS_OK; 3895 } 3896 3897 3898 // Hint to the underlying OS that a task switch would not be good. 3899 // Void return because it's a hint and can fail. 3900 void os::hint_no_preempt() { 3901 schedctl_start(schedctl_init()); 3902 } 3903 3904 static void resume_clear_context(OSThread *osthread) { 3905 osthread->set_ucontext(NULL); 3906 } 3907 3908 static void suspend_save_context(OSThread *osthread, ucontext_t* context) { 3909 osthread->set_ucontext(context); 3910 } 3911 3912 static Semaphore sr_semaphore; 3913 3914 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) { 3915 // Save and restore errno to avoid confusing native code with EINTR 3916 // after sigsuspend. 3917 int old_errno = errno; 3918 3919 OSThread* osthread = thread->osthread(); 3920 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 3921 3922 os::SuspendResume::State current = osthread->sr.state(); 3923 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 3924 suspend_save_context(osthread, uc); 3925 3926 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 3927 os::SuspendResume::State state = osthread->sr.suspended(); 3928 if (state == os::SuspendResume::SR_SUSPENDED) { 3929 sigset_t suspend_set; // signals for sigsuspend() 3930 3931 // get current set of blocked signals and unblock resume signal 3932 thr_sigsetmask(SIG_BLOCK, NULL, &suspend_set); 3933 sigdelset(&suspend_set, os::Solaris::SIGasync()); 3934 3935 sr_semaphore.signal(); 3936 // wait here until we are resumed 3937 while (1) { 3938 sigsuspend(&suspend_set); 3939 3940 os::SuspendResume::State result = osthread->sr.running(); 3941 if (result == os::SuspendResume::SR_RUNNING) { 3942 sr_semaphore.signal(); 3943 break; 3944 } 3945 } 3946 3947 } else if (state == os::SuspendResume::SR_RUNNING) { 3948 // request was cancelled, continue 3949 } else { 3950 ShouldNotReachHere(); 3951 } 3952 3953 resume_clear_context(osthread); 3954 } else if (current == os::SuspendResume::SR_RUNNING) { 3955 // request was cancelled, continue 3956 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 3957 // ignore 3958 } else { 3959 // ignore 3960 } 3961 3962 errno = old_errno; 3963 } 3964 3965 void os::print_statistics() { 3966 } 3967 3968 int os::message_box(const char* title, const char* message) { 3969 int i; 3970 fdStream err(defaultStream::error_fd()); 3971 for (i = 0; i < 78; i++) err.print_raw("="); 3972 err.cr(); 3973 err.print_raw_cr(title); 3974 for (i = 0; i < 78; i++) err.print_raw("-"); 3975 err.cr(); 3976 err.print_raw_cr(message); 3977 for (i = 0; i < 78; i++) err.print_raw("="); 3978 err.cr(); 3979 3980 char buf[16]; 3981 // Prevent process from exiting upon "read error" without consuming all CPU 3982 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3983 3984 return buf[0] == 'y' || buf[0] == 'Y'; 3985 } 3986 3987 static int sr_notify(OSThread* osthread) { 3988 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync()); 3989 assert_status(status == 0, status, "thr_kill"); 3990 return status; 3991 } 3992 3993 // "Randomly" selected value for how long we want to spin 3994 // before bailing out on suspending a thread, also how often 3995 // we send a signal to a thread we want to resume 3996 static const int RANDOMLY_LARGE_INTEGER = 1000000; 3997 static const int RANDOMLY_LARGE_INTEGER2 = 100; 3998 3999 static bool do_suspend(OSThread* osthread) { 4000 assert(osthread->sr.is_running(), "thread should be running"); 4001 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 4002 4003 // mark as suspended and send signal 4004 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 4005 // failed to switch, state wasn't running? 4006 ShouldNotReachHere(); 4007 return false; 4008 } 4009 4010 if (sr_notify(osthread) != 0) { 4011 ShouldNotReachHere(); 4012 } 4013 4014 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 4015 while (true) { 4016 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) { 4017 break; 4018 } else { 4019 // timeout 4020 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 4021 if (cancelled == os::SuspendResume::SR_RUNNING) { 4022 return false; 4023 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 4024 // make sure that we consume the signal on the semaphore as well 4025 sr_semaphore.wait(); 4026 break; 4027 } else { 4028 ShouldNotReachHere(); 4029 return false; 4030 } 4031 } 4032 } 4033 4034 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 4035 return true; 4036 } 4037 4038 static void do_resume(OSThread* osthread) { 4039 assert(osthread->sr.is_suspended(), "thread should be suspended"); 4040 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 4041 4042 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 4043 // failed to switch to WAKEUP_REQUEST 4044 ShouldNotReachHere(); 4045 return; 4046 } 4047 4048 while (true) { 4049 if (sr_notify(osthread) == 0) { 4050 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 4051 if (osthread->sr.is_running()) { 4052 return; 4053 } 4054 } 4055 } else { 4056 ShouldNotReachHere(); 4057 } 4058 } 4059 4060 guarantee(osthread->sr.is_running(), "Must be running!"); 4061 } 4062 4063 void os::SuspendedThreadTask::internal_do_task() { 4064 if (do_suspend(_thread->osthread())) { 4065 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 4066 do_task(context); 4067 do_resume(_thread->osthread()); 4068 } 4069 } 4070 4071 class PcFetcher : public os::SuspendedThreadTask { 4072 public: 4073 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} 4074 ExtendedPC result(); 4075 protected: 4076 void do_task(const os::SuspendedThreadTaskContext& context); 4077 private: 4078 ExtendedPC _epc; 4079 }; 4080 4081 ExtendedPC PcFetcher::result() { 4082 guarantee(is_done(), "task is not done yet."); 4083 return _epc; 4084 } 4085 4086 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { 4087 Thread* thread = context.thread(); 4088 OSThread* osthread = thread->osthread(); 4089 if (osthread->ucontext() != NULL) { 4090 _epc = os::Solaris::ucontext_get_pc((ucontext_t *) context.ucontext()); 4091 } else { 4092 // NULL context is unexpected, double-check this is the VMThread 4093 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 4094 } 4095 } 4096 4097 // A lightweight implementation that does not suspend the target thread and 4098 // thus returns only a hint. Used for profiling only! 4099 ExtendedPC os::get_thread_pc(Thread* thread) { 4100 // Make sure that it is called by the watcher and the Threads lock is owned. 4101 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock"); 4102 // For now, is only used to profile the VM Thread 4103 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 4104 PcFetcher fetcher(thread); 4105 fetcher.run(); 4106 return fetcher.result(); 4107 } 4108 4109 4110 // This does not do anything on Solaris. This is basically a hook for being 4111 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 4112 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) { 4113 f(value, method, args, thread); 4114 } 4115 4116 // This routine may be used by user applications as a "hook" to catch signals. 4117 // The user-defined signal handler must pass unrecognized signals to this 4118 // routine, and if it returns true (non-zero), then the signal handler must 4119 // return immediately. If the flag "abort_if_unrecognized" is true, then this 4120 // routine will never retun false (zero), but instead will execute a VM panic 4121 // routine kill the process. 4122 // 4123 // If this routine returns false, it is OK to call it again. This allows 4124 // the user-defined signal handler to perform checks either before or after 4125 // the VM performs its own checks. Naturally, the user code would be making 4126 // a serious error if it tried to handle an exception (such as a null check 4127 // or breakpoint) that the VM was generating for its own correct operation. 4128 // 4129 // This routine may recognize any of the following kinds of signals: 4130 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 4131 // os::Solaris::SIGasync 4132 // It should be consulted by handlers for any of those signals. 4133 // It explicitly does not recognize os::Solaris::SIGinterrupt 4134 // 4135 // The caller of this routine must pass in the three arguments supplied 4136 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 4137 // field of the structure passed to sigaction(). This routine assumes that 4138 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 4139 // 4140 // Note that the VM will print warnings if it detects conflicting signal 4141 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 4142 // 4143 extern "C" JNIEXPORT int 4144 JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, 4145 int abort_if_unrecognized); 4146 4147 4148 void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 4149 int orig_errno = errno; // Preserve errno value over signal handler. 4150 JVM_handle_solaris_signal(sig, info, ucVoid, true); 4151 errno = orig_errno; 4152 } 4153 4154 /* Do not delete - if guarantee is ever removed, a signal handler (even empty) 4155 is needed to provoke threads blocked on IO to return an EINTR 4156 Note: this explicitly does NOT call JVM_handle_solaris_signal and 4157 does NOT participate in signal chaining due to requirement for 4158 NOT setting SA_RESTART to make EINTR work. */ 4159 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) { 4160 if (UseSignalChaining) { 4161 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig); 4162 if (actp && actp->sa_handler) { 4163 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs"); 4164 } 4165 } 4166 } 4167 4168 // This boolean allows users to forward their own non-matching signals 4169 // to JVM_handle_solaris_signal, harmlessly. 4170 bool os::Solaris::signal_handlers_are_installed = false; 4171 4172 // For signal-chaining 4173 bool os::Solaris::libjsig_is_loaded = false; 4174 typedef struct sigaction *(*get_signal_t)(int); 4175 get_signal_t os::Solaris::get_signal_action = NULL; 4176 4177 struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 4178 struct sigaction *actp = NULL; 4179 4180 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) { 4181 // Retrieve the old signal handler from libjsig 4182 actp = (*get_signal_action)(sig); 4183 } 4184 if (actp == NULL) { 4185 // Retrieve the preinstalled signal handler from jvm 4186 actp = get_preinstalled_handler(sig); 4187 } 4188 4189 return actp; 4190 } 4191 4192 static bool call_chained_handler(struct sigaction *actp, int sig, 4193 siginfo_t *siginfo, void *context) { 4194 // Call the old signal handler 4195 if (actp->sa_handler == SIG_DFL) { 4196 // It's more reasonable to let jvm treat it as an unexpected exception 4197 // instead of taking the default action. 4198 return false; 4199 } else if (actp->sa_handler != SIG_IGN) { 4200 if ((actp->sa_flags & SA_NODEFER) == 0) { 4201 // automaticlly block the signal 4202 sigaddset(&(actp->sa_mask), sig); 4203 } 4204 4205 sa_handler_t hand; 4206 sa_sigaction_t sa; 4207 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 4208 // retrieve the chained handler 4209 if (siginfo_flag_set) { 4210 sa = actp->sa_sigaction; 4211 } else { 4212 hand = actp->sa_handler; 4213 } 4214 4215 if ((actp->sa_flags & SA_RESETHAND) != 0) { 4216 actp->sa_handler = SIG_DFL; 4217 } 4218 4219 // try to honor the signal mask 4220 sigset_t oset; 4221 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset); 4222 4223 // call into the chained handler 4224 if (siginfo_flag_set) { 4225 (*sa)(sig, siginfo, context); 4226 } else { 4227 (*hand)(sig); 4228 } 4229 4230 // restore the signal mask 4231 thr_sigsetmask(SIG_SETMASK, &oset, 0); 4232 } 4233 // Tell jvm's signal handler the signal is taken care of. 4234 return true; 4235 } 4236 4237 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 4238 bool chained = false; 4239 // signal-chaining 4240 if (UseSignalChaining) { 4241 struct sigaction *actp = get_chained_signal_action(sig); 4242 if (actp != NULL) { 4243 chained = call_chained_handler(actp, sig, siginfo, context); 4244 } 4245 } 4246 return chained; 4247 } 4248 4249 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 4250 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized"); 4251 if (preinstalled_sigs[sig] != 0) { 4252 return &chainedsigactions[sig]; 4253 } 4254 return NULL; 4255 } 4256 4257 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 4258 4259 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 4260 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized"); 4261 chainedsigactions[sig] = oldAct; 4262 preinstalled_sigs[sig] = 1; 4263 } 4264 4265 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) { 4266 // Check for overwrite. 4267 struct sigaction oldAct; 4268 sigaction(sig, (struct sigaction*)NULL, &oldAct); 4269 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4270 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4271 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 4272 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 4273 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 4274 if (AllowUserSignalHandlers || !set_installed) { 4275 // Do not overwrite; user takes responsibility to forward to us. 4276 return; 4277 } else if (UseSignalChaining) { 4278 if (oktochain) { 4279 // save the old handler in jvm 4280 save_preinstalled_handler(sig, oldAct); 4281 } else { 4282 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs."); 4283 } 4284 // libjsig also interposes the sigaction() call below and saves the 4285 // old sigaction on it own. 4286 } else { 4287 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " 4288 "%#lx for signal %d.", (long)oldhand, sig)); 4289 } 4290 } 4291 4292 struct sigaction sigAct; 4293 sigfillset(&(sigAct.sa_mask)); 4294 sigAct.sa_handler = SIG_DFL; 4295 4296 sigAct.sa_sigaction = signalHandler; 4297 // Handle SIGSEGV on alternate signal stack if 4298 // not using stack banging 4299 if (!UseStackBanging && sig == SIGSEGV) { 4300 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 4301 // Interruptible i/o requires SA_RESTART cleared so EINTR 4302 // is returned instead of restarting system calls 4303 } else if (sig == os::Solaris::SIGinterrupt()) { 4304 sigemptyset(&sigAct.sa_mask); 4305 sigAct.sa_handler = NULL; 4306 sigAct.sa_flags = SA_SIGINFO; 4307 sigAct.sa_sigaction = sigINTRHandler; 4308 } else { 4309 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 4310 } 4311 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 4312 4313 sigaction(sig, &sigAct, &oldAct); 4314 4315 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4316 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4317 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 4318 } 4319 4320 4321 #define DO_SIGNAL_CHECK(sig) \ 4322 if (!sigismember(&check_signal_done, sig)) \ 4323 os::Solaris::check_signal_handler(sig) 4324 4325 // This method is a periodic task to check for misbehaving JNI applications 4326 // under CheckJNI, we can add any periodic checks here 4327 4328 void os::run_periodic_checks() { 4329 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 4330 // thereby preventing a NULL checks. 4331 if(!check_addr0_done) check_addr0_done = check_addr0(tty); 4332 4333 if (check_signals == false) return; 4334 4335 // SEGV and BUS if overridden could potentially prevent 4336 // generation of hs*.log in the event of a crash, debugging 4337 // such a case can be very challenging, so we absolutely 4338 // check for the following for a good measure: 4339 DO_SIGNAL_CHECK(SIGSEGV); 4340 DO_SIGNAL_CHECK(SIGILL); 4341 DO_SIGNAL_CHECK(SIGFPE); 4342 DO_SIGNAL_CHECK(SIGBUS); 4343 DO_SIGNAL_CHECK(SIGPIPE); 4344 DO_SIGNAL_CHECK(SIGXFSZ); 4345 4346 // ReduceSignalUsage allows the user to override these handlers 4347 // see comments at the very top and jvm_solaris.h 4348 if (!ReduceSignalUsage) { 4349 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 4350 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 4351 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 4352 DO_SIGNAL_CHECK(BREAK_SIGNAL); 4353 } 4354 4355 // See comments above for using JVM1/JVM2 and UseAltSigs 4356 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt()); 4357 DO_SIGNAL_CHECK(os::Solaris::SIGasync()); 4358 4359 } 4360 4361 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 4362 4363 static os_sigaction_t os_sigaction = NULL; 4364 4365 void os::Solaris::check_signal_handler(int sig) { 4366 char buf[O_BUFLEN]; 4367 address jvmHandler = NULL; 4368 4369 struct sigaction act; 4370 if (os_sigaction == NULL) { 4371 // only trust the default sigaction, in case it has been interposed 4372 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 4373 if (os_sigaction == NULL) return; 4374 } 4375 4376 os_sigaction(sig, (struct sigaction*)NULL, &act); 4377 4378 address thisHandler = (act.sa_flags & SA_SIGINFO) 4379 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 4380 : CAST_FROM_FN_PTR(address, act.sa_handler) ; 4381 4382 4383 switch(sig) { 4384 case SIGSEGV: 4385 case SIGBUS: 4386 case SIGFPE: 4387 case SIGPIPE: 4388 case SIGXFSZ: 4389 case SIGILL: 4390 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4391 break; 4392 4393 case SHUTDOWN1_SIGNAL: 4394 case SHUTDOWN2_SIGNAL: 4395 case SHUTDOWN3_SIGNAL: 4396 case BREAK_SIGNAL: 4397 jvmHandler = (address)user_handler(); 4398 break; 4399 4400 default: 4401 int intrsig = os::Solaris::SIGinterrupt(); 4402 int asynsig = os::Solaris::SIGasync(); 4403 4404 if (sig == intrsig) { 4405 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler); 4406 } else if (sig == asynsig) { 4407 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4408 } else { 4409 return; 4410 } 4411 break; 4412 } 4413 4414 4415 if (thisHandler != jvmHandler) { 4416 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 4417 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 4418 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 4419 // No need to check this sig any longer 4420 sigaddset(&check_signal_done, sig); 4421 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 4422 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 4423 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 4424 exception_name(sig, buf, O_BUFLEN)); 4425 } 4426 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 4427 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 4428 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig)); 4429 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); 4430 // No need to check this sig any longer 4431 sigaddset(&check_signal_done, sig); 4432 } 4433 4434 // Print all the signal handler state 4435 if (sigismember(&check_signal_done, sig)) { 4436 print_signal_handlers(tty, buf, O_BUFLEN); 4437 } 4438 4439 } 4440 4441 void os::Solaris::install_signal_handlers() { 4442 bool libjsigdone = false; 4443 signal_handlers_are_installed = true; 4444 4445 // signal-chaining 4446 typedef void (*signal_setting_t)(); 4447 signal_setting_t begin_signal_setting = NULL; 4448 signal_setting_t end_signal_setting = NULL; 4449 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4450 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 4451 if (begin_signal_setting != NULL) { 4452 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4453 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 4454 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 4455 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 4456 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t, 4457 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version")); 4458 libjsig_is_loaded = true; 4459 if (os::Solaris::get_libjsig_version != NULL) { 4460 libjsigversion = (*os::Solaris::get_libjsig_version)(); 4461 } 4462 assert(UseSignalChaining, "should enable signal-chaining"); 4463 } 4464 if (libjsig_is_loaded) { 4465 // Tell libjsig jvm is setting signal handlers 4466 (*begin_signal_setting)(); 4467 } 4468 4469 set_signal_handler(SIGSEGV, true, true); 4470 set_signal_handler(SIGPIPE, true, true); 4471 set_signal_handler(SIGXFSZ, true, true); 4472 set_signal_handler(SIGBUS, true, true); 4473 set_signal_handler(SIGILL, true, true); 4474 set_signal_handler(SIGFPE, true, true); 4475 4476 4477 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) { 4478 4479 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so 4480 // can not register overridable signals which might be > 32 4481 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) { 4482 // Tell libjsig jvm has finished setting signal handlers 4483 (*end_signal_setting)(); 4484 libjsigdone = true; 4485 } 4486 } 4487 4488 // Never ok to chain our SIGinterrupt 4489 set_signal_handler(os::Solaris::SIGinterrupt(), true, false); 4490 set_signal_handler(os::Solaris::SIGasync(), true, true); 4491 4492 if (libjsig_is_loaded && !libjsigdone) { 4493 // Tell libjsig jvm finishes setting signal handlers 4494 (*end_signal_setting)(); 4495 } 4496 4497 // We don't activate signal checker if libjsig is in place, we trust ourselves 4498 // and if UserSignalHandler is installed all bets are off. 4499 // Log that signal checking is off only if -verbose:jni is specified. 4500 if (CheckJNICalls) { 4501 if (libjsig_is_loaded) { 4502 if (PrintJNIResolving) { 4503 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 4504 } 4505 check_signals = false; 4506 } 4507 if (AllowUserSignalHandlers) { 4508 if (PrintJNIResolving) { 4509 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4510 } 4511 check_signals = false; 4512 } 4513 } 4514 } 4515 4516 4517 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...); 4518 4519 const char * signames[] = { 4520 "SIG0", 4521 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP", 4522 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS", 4523 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM", 4524 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH", 4525 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT", 4526 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU", 4527 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW", 4528 "SIGCANCEL", "SIGLOST" 4529 }; 4530 4531 const char* os::exception_name(int exception_code, char* buf, size_t size) { 4532 if (0 < exception_code && exception_code <= SIGRTMAX) { 4533 // signal 4534 if (exception_code < sizeof(signames)/sizeof(const char*)) { 4535 jio_snprintf(buf, size, "%s", signames[exception_code]); 4536 } else { 4537 jio_snprintf(buf, size, "SIG%d", exception_code); 4538 } 4539 return buf; 4540 } else { 4541 return NULL; 4542 } 4543 } 4544 4545 // (Static) wrappers for the new libthread API 4546 int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate; 4547 int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate; 4548 int_fnP_thread_t_i os::Solaris::_thr_setmutator; 4549 int_fnP_thread_t os::Solaris::_thr_suspend_mutator; 4550 int_fnP_thread_t os::Solaris::_thr_continue_mutator; 4551 4552 // (Static) wrapper for getisax(2) call. 4553 os::Solaris::getisax_func_t os::Solaris::_getisax = 0; 4554 4555 // (Static) wrappers for the liblgrp API 4556 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 4557 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 4558 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 4559 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 4560 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 4561 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 4562 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 4563 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 4564 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 4565 4566 // (Static) wrapper for meminfo() call. 4567 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0; 4568 4569 static address resolve_symbol_lazy(const char* name) { 4570 address addr = (address) dlsym(RTLD_DEFAULT, name); 4571 if(addr == NULL) { 4572 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 4573 addr = (address) dlsym(RTLD_NEXT, name); 4574 } 4575 return addr; 4576 } 4577 4578 static address resolve_symbol(const char* name) { 4579 address addr = resolve_symbol_lazy(name); 4580 if(addr == NULL) { 4581 fatal(dlerror()); 4582 } 4583 return addr; 4584 } 4585 4586 4587 4588 // isT2_libthread() 4589 // 4590 // Routine to determine if we are currently using the new T2 libthread. 4591 // 4592 // We determine if we are using T2 by reading /proc/self/lstatus and 4593 // looking for a thread with the ASLWP bit set. If we find this status 4594 // bit set, we must assume that we are NOT using T2. The T2 team 4595 // has approved this algorithm. 4596 // 4597 // We need to determine if we are running with the new T2 libthread 4598 // since setting native thread priorities is handled differently 4599 // when using this library. All threads created using T2 are bound 4600 // threads. Calling thr_setprio is meaningless in this case. 4601 // 4602 bool isT2_libthread() { 4603 static prheader_t * lwpArray = NULL; 4604 static int lwpSize = 0; 4605 static int lwpFile = -1; 4606 lwpstatus_t * that; 4607 char lwpName [128]; 4608 bool isT2 = false; 4609 4610 #define ADR(x) ((uintptr_t)(x)) 4611 #define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1)))) 4612 4613 lwpFile = ::open("/proc/self/lstatus", O_RDONLY, 0); 4614 if (lwpFile < 0) { 4615 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n"); 4616 return false; 4617 } 4618 lwpSize = 16*1024; 4619 for (;;) { 4620 ::lseek64 (lwpFile, 0, SEEK_SET); 4621 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize, mtInternal); 4622 if (::read(lwpFile, lwpArray, lwpSize) < 0) { 4623 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n"); 4624 break; 4625 } 4626 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) { 4627 // We got a good snapshot - now iterate over the list. 4628 int aslwpcount = 0; 4629 for (int i = 0; i < lwpArray->pr_nent; i++ ) { 4630 that = LWPINDEX(lwpArray,i); 4631 if (that->pr_flags & PR_ASLWP) { 4632 aslwpcount++; 4633 } 4634 } 4635 if (aslwpcount == 0) isT2 = true; 4636 break; 4637 } 4638 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize; 4639 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal); // retry. 4640 } 4641 4642 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal); 4643 ::close (lwpFile); 4644 if (ThreadPriorityVerbose) { 4645 if (isT2) tty->print_cr("We are running with a T2 libthread\n"); 4646 else tty->print_cr("We are not running with a T2 libthread\n"); 4647 } 4648 return isT2; 4649 } 4650 4651 4652 void os::Solaris::libthread_init() { 4653 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 4654 4655 // Determine if we are running with the new T2 libthread 4656 os::Solaris::set_T2_libthread(isT2_libthread()); 4657 4658 lwp_priocntl_init(); 4659 4660 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 4661 if(func == NULL) { 4662 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 4663 // Guarantee that this VM is running on an new enough OS (5.6 or 4664 // later) that it will have a new enough libthread.so. 4665 guarantee(func != NULL, "libthread.so is too old."); 4666 } 4667 4668 // Initialize the new libthread getstate API wrappers 4669 func = resolve_symbol("thr_getstate"); 4670 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func)); 4671 4672 func = resolve_symbol("thr_setstate"); 4673 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func)); 4674 4675 func = resolve_symbol("thr_setmutator"); 4676 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func)); 4677 4678 func = resolve_symbol("thr_suspend_mutator"); 4679 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func)); 4680 4681 func = resolve_symbol("thr_continue_mutator"); 4682 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func)); 4683 4684 int size; 4685 void (*handler_info_func)(address *, int *); 4686 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 4687 handler_info_func(&handler_start, &size); 4688 handler_end = handler_start + size; 4689 } 4690 4691 4692 int_fnP_mutex_tP os::Solaris::_mutex_lock; 4693 int_fnP_mutex_tP os::Solaris::_mutex_trylock; 4694 int_fnP_mutex_tP os::Solaris::_mutex_unlock; 4695 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 4696 int_fnP_mutex_tP os::Solaris::_mutex_destroy; 4697 int os::Solaris::_mutex_scope = USYNC_THREAD; 4698 4699 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 4700 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 4701 int_fnP_cond_tP os::Solaris::_cond_signal; 4702 int_fnP_cond_tP os::Solaris::_cond_broadcast; 4703 int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 4704 int_fnP_cond_tP os::Solaris::_cond_destroy; 4705 int os::Solaris::_cond_scope = USYNC_THREAD; 4706 4707 void os::Solaris::synchronization_init() { 4708 if(UseLWPSynchronization) { 4709 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 4710 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 4711 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 4712 os::Solaris::set_mutex_init(lwp_mutex_init); 4713 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 4714 os::Solaris::set_mutex_scope(USYNC_THREAD); 4715 4716 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 4717 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 4718 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 4719 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 4720 os::Solaris::set_cond_init(lwp_cond_init); 4721 os::Solaris::set_cond_destroy(lwp_cond_destroy); 4722 os::Solaris::set_cond_scope(USYNC_THREAD); 4723 } 4724 else { 4725 os::Solaris::set_mutex_scope(USYNC_THREAD); 4726 os::Solaris::set_cond_scope(USYNC_THREAD); 4727 4728 if(UsePthreads) { 4729 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 4730 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 4731 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 4732 os::Solaris::set_mutex_init(pthread_mutex_default_init); 4733 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 4734 4735 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 4736 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 4737 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 4738 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 4739 os::Solaris::set_cond_init(pthread_cond_default_init); 4740 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 4741 } 4742 else { 4743 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 4744 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 4745 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 4746 os::Solaris::set_mutex_init(::mutex_init); 4747 os::Solaris::set_mutex_destroy(::mutex_destroy); 4748 4749 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 4750 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 4751 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 4752 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 4753 os::Solaris::set_cond_init(::cond_init); 4754 os::Solaris::set_cond_destroy(::cond_destroy); 4755 } 4756 } 4757 } 4758 4759 bool os::Solaris::liblgrp_init() { 4760 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 4761 if (handle != NULL) { 4762 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 4763 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 4764 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 4765 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 4766 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 4767 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 4768 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 4769 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 4770 dlsym(handle, "lgrp_cookie_stale"))); 4771 4772 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 4773 set_lgrp_cookie(c); 4774 return true; 4775 } 4776 return false; 4777 } 4778 4779 void os::Solaris::misc_sym_init() { 4780 address func; 4781 4782 // getisax 4783 func = resolve_symbol_lazy("getisax"); 4784 if (func != NULL) { 4785 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func); 4786 } 4787 4788 // meminfo 4789 func = resolve_symbol_lazy("meminfo"); 4790 if (func != NULL) { 4791 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func)); 4792 } 4793 } 4794 4795 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) { 4796 assert(_getisax != NULL, "_getisax not set"); 4797 return _getisax(array, n); 4798 } 4799 4800 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 4801 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 4802 static pset_getloadavg_type pset_getloadavg_ptr = NULL; 4803 4804 void init_pset_getloadavg_ptr(void) { 4805 pset_getloadavg_ptr = 4806 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 4807 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) { 4808 warning("pset_getloadavg function not found"); 4809 } 4810 } 4811 4812 int os::Solaris::_dev_zero_fd = -1; 4813 4814 // this is called _before_ the global arguments have been parsed 4815 void os::init(void) { 4816 _initial_pid = getpid(); 4817 4818 max_hrtime = first_hrtime = gethrtime(); 4819 4820 init_random(1234567); 4821 4822 page_size = sysconf(_SC_PAGESIZE); 4823 if (page_size == -1) 4824 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)", 4825 strerror(errno))); 4826 init_page_sizes((size_t) page_size); 4827 4828 Solaris::initialize_system_info(); 4829 4830 // Initialize misc. symbols as soon as possible, so we can use them 4831 // if we need them. 4832 Solaris::misc_sym_init(); 4833 4834 int fd = ::open("/dev/zero", O_RDWR); 4835 if (fd < 0) { 4836 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno))); 4837 } else { 4838 Solaris::set_dev_zero_fd(fd); 4839 4840 // Close on exec, child won't inherit. 4841 fcntl(fd, F_SETFD, FD_CLOEXEC); 4842 } 4843 4844 clock_tics_per_sec = CLK_TCK; 4845 4846 // check if dladdr1() exists; dladdr1 can provide more information than 4847 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 4848 // and is available on linker patches for 5.7 and 5.8. 4849 // libdl.so must have been loaded, this call is just an entry lookup 4850 void * hdl = dlopen("libdl.so", RTLD_NOW); 4851 if (hdl) 4852 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 4853 4854 // (Solaris only) this switches to calls that actually do locking. 4855 ThreadCritical::initialize(); 4856 4857 main_thread = thr_self(); 4858 4859 // Constant minimum stack size allowed. It must be at least 4860 // the minimum of what the OS supports (thr_min_stack()), and 4861 // enough to allow the thread to get to user bytecode execution. 4862 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed); 4863 // If the pagesize of the VM is greater than 8K determine the appropriate 4864 // number of initial guard pages. The user can change this with the 4865 // command line arguments, if needed. 4866 if (vm_page_size() > 8*K) { 4867 StackYellowPages = 1; 4868 StackRedPages = 1; 4869 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size(); 4870 } 4871 } 4872 4873 // To install functions for atexit system call 4874 extern "C" { 4875 static void perfMemory_exit_helper() { 4876 perfMemory_exit(); 4877 } 4878 } 4879 4880 // this is called _after_ the global arguments have been parsed 4881 jint os::init_2(void) { 4882 // try to enable extended file IO ASAP, see 6431278 4883 os::Solaris::try_enable_extended_io(); 4884 4885 // Allocate a single page and mark it as readable for safepoint polling. Also 4886 // use this first mmap call to check support for MAP_ALIGN. 4887 address polling_page = (address)Solaris::mmap_chunk((char*)page_size, 4888 page_size, 4889 MAP_PRIVATE | MAP_ALIGN, 4890 PROT_READ); 4891 if (polling_page == NULL) { 4892 has_map_align = false; 4893 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, 4894 PROT_READ); 4895 } 4896 4897 os::set_polling_page(polling_page); 4898 4899 #ifndef PRODUCT 4900 if( Verbose && PrintMiscellaneous ) 4901 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 4902 #endif 4903 4904 if (!UseMembar) { 4905 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE ); 4906 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 4907 os::set_memory_serialize_page( mem_serialize_page ); 4908 4909 #ifndef PRODUCT 4910 if(Verbose && PrintMiscellaneous) 4911 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 4912 #endif 4913 } 4914 4915 // Check minimum allowable stack size for thread creation and to initialize 4916 // the java system classes, including StackOverflowError - depends on page 4917 // size. Add a page for compiler2 recursion in main thread. 4918 // Add in 2*BytesPerWord times page size to account for VM stack during 4919 // class initialization depending on 32 or 64 bit VM. 4920 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed, 4921 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 4922 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size); 4923 4924 size_t threadStackSizeInBytes = ThreadStackSize * K; 4925 if (threadStackSizeInBytes != 0 && 4926 threadStackSizeInBytes < os::Solaris::min_stack_allowed) { 4927 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk", 4928 os::Solaris::min_stack_allowed/K); 4929 return JNI_ERR; 4930 } 4931 4932 // For 64kbps there will be a 64kb page size, which makes 4933 // the usable default stack size quite a bit less. Increase the 4934 // stack for 64kb (or any > than 8kb) pages, this increases 4935 // virtual memory fragmentation (since we're not creating the 4936 // stack on a power of 2 boundary. The real fix for this 4937 // should be to fix the guard page mechanism. 4938 4939 if (vm_page_size() > 8*K) { 4940 threadStackSizeInBytes = (threadStackSizeInBytes != 0) 4941 ? threadStackSizeInBytes + 4942 ((StackYellowPages + StackRedPages) * vm_page_size()) 4943 : 0; 4944 ThreadStackSize = threadStackSizeInBytes/K; 4945 } 4946 4947 // Make the stack size a multiple of the page size so that 4948 // the yellow/red zones can be guarded. 4949 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 4950 vm_page_size())); 4951 4952 Solaris::libthread_init(); 4953 4954 if (UseNUMA) { 4955 if (!Solaris::liblgrp_init()) { 4956 UseNUMA = false; 4957 } else { 4958 size_t lgrp_limit = os::numa_get_groups_num(); 4959 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); 4960 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 4961 FREE_C_HEAP_ARRAY(int, lgrp_ids, mtInternal); 4962 if (lgrp_num < 2) { 4963 // There's only one locality group, disable NUMA. 4964 UseNUMA = false; 4965 } 4966 } 4967 if (!UseNUMA && ForceNUMA) { 4968 UseNUMA = true; 4969 } 4970 } 4971 4972 Solaris::signal_sets_init(); 4973 Solaris::init_signal_mem(); 4974 Solaris::install_signal_handlers(); 4975 4976 if (libjsigversion < JSIG_VERSION_1_4_1) { 4977 Maxlibjsigsigs = OLDMAXSIGNUM; 4978 } 4979 4980 // initialize synchronization primitives to use either thread or 4981 // lwp synchronization (controlled by UseLWPSynchronization) 4982 Solaris::synchronization_init(); 4983 4984 if (MaxFDLimit) { 4985 // set the number of file descriptors to max. print out error 4986 // if getrlimit/setrlimit fails but continue regardless. 4987 struct rlimit nbr_files; 4988 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 4989 if (status != 0) { 4990 if (PrintMiscellaneous && (Verbose || WizardMode)) 4991 perror("os::init_2 getrlimit failed"); 4992 } else { 4993 nbr_files.rlim_cur = nbr_files.rlim_max; 4994 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 4995 if (status != 0) { 4996 if (PrintMiscellaneous && (Verbose || WizardMode)) 4997 perror("os::init_2 setrlimit failed"); 4998 } 4999 } 5000 } 5001 5002 // Calculate theoretical max. size of Threads to guard gainst 5003 // artifical out-of-memory situations, where all available address- 5004 // space has been reserved by thread stacks. Default stack size is 1Mb. 5005 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 5006 JavaThread::stack_size_at_create() : (1*K*K); 5007 assert(pre_thread_stack_size != 0, "Must have a stack"); 5008 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 5009 // we should start doing Virtual Memory banging. Currently when the threads will 5010 // have used all but 200Mb of space. 5011 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 5012 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 5013 5014 // at-exit methods are called in the reverse order of their registration. 5015 // In Solaris 7 and earlier, atexit functions are called on return from 5016 // main or as a result of a call to exit(3C). There can be only 32 of 5017 // these functions registered and atexit() does not set errno. In Solaris 5018 // 8 and later, there is no limit to the number of functions registered 5019 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 5020 // functions are called upon dlclose(3DL) in addition to return from main 5021 // and exit(3C). 5022 5023 if (PerfAllowAtExitRegistration) { 5024 // only register atexit functions if PerfAllowAtExitRegistration is set. 5025 // atexit functions can be delayed until process exit time, which 5026 // can be problematic for embedded VM situations. Embedded VMs should 5027 // call DestroyJavaVM() to assure that VM resources are released. 5028 5029 // note: perfMemory_exit_helper atexit function may be removed in 5030 // the future if the appropriate cleanup code can be added to the 5031 // VM_Exit VMOperation's doit method. 5032 if (atexit(perfMemory_exit_helper) != 0) { 5033 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 5034 } 5035 } 5036 5037 // Init pset_loadavg function pointer 5038 init_pset_getloadavg_ptr(); 5039 5040 return JNI_OK; 5041 } 5042 5043 void os::init_3(void) { 5044 return; 5045 } 5046 5047 // Mark the polling page as unreadable 5048 void os::make_polling_page_unreadable(void) { 5049 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 ) 5050 fatal("Could not disable polling page"); 5051 }; 5052 5053 // Mark the polling page as readable 5054 void os::make_polling_page_readable(void) { 5055 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 ) 5056 fatal("Could not enable polling page"); 5057 }; 5058 5059 // OS interface. 5060 5061 bool os::check_heap(bool force) { return true; } 5062 5063 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr); 5064 static vsnprintf_t sol_vsnprintf = NULL; 5065 5066 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) { 5067 if (!sol_vsnprintf) { 5068 //search for the named symbol in the objects that were loaded after libjvm 5069 void* where = RTLD_NEXT; 5070 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL) 5071 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf")); 5072 if (!sol_vsnprintf){ 5073 //search for the named symbol in the objects that were loaded before libjvm 5074 where = RTLD_DEFAULT; 5075 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL) 5076 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf")); 5077 assert(sol_vsnprintf != NULL, "vsnprintf not found"); 5078 } 5079 } 5080 return (*sol_vsnprintf)(buf, count, fmt, argptr); 5081 } 5082 5083 5084 // Is a (classpath) directory empty? 5085 bool os::dir_is_empty(const char* path) { 5086 DIR *dir = NULL; 5087 struct dirent *ptr; 5088 5089 dir = opendir(path); 5090 if (dir == NULL) return true; 5091 5092 /* Scan the directory */ 5093 bool result = true; 5094 char buf[sizeof(struct dirent) + MAX_PATH]; 5095 struct dirent *dbuf = (struct dirent *) buf; 5096 while (result && (ptr = readdir(dir, dbuf)) != NULL) { 5097 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 5098 result = false; 5099 } 5100 } 5101 closedir(dir); 5102 return result; 5103 } 5104 5105 // This code originates from JDK's sysOpen and open64_w 5106 // from src/solaris/hpi/src/system_md.c 5107 5108 #ifndef O_DELETE 5109 #define O_DELETE 0x10000 5110 #endif 5111 5112 // Open a file. Unlink the file immediately after open returns 5113 // if the specified oflag has the O_DELETE flag set. 5114 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c 5115 5116 int os::open(const char *path, int oflag, int mode) { 5117 if (strlen(path) > MAX_PATH - 1) { 5118 errno = ENAMETOOLONG; 5119 return -1; 5120 } 5121 int fd; 5122 int o_delete = (oflag & O_DELETE); 5123 oflag = oflag & ~O_DELETE; 5124 5125 fd = ::open64(path, oflag, mode); 5126 if (fd == -1) return -1; 5127 5128 //If the open succeeded, the file might still be a directory 5129 { 5130 struct stat64 buf64; 5131 int ret = ::fstat64(fd, &buf64); 5132 int st_mode = buf64.st_mode; 5133 5134 if (ret != -1) { 5135 if ((st_mode & S_IFMT) == S_IFDIR) { 5136 errno = EISDIR; 5137 ::close(fd); 5138 return -1; 5139 } 5140 } else { 5141 ::close(fd); 5142 return -1; 5143 } 5144 } 5145 /* 5146 * 32-bit Solaris systems suffer from: 5147 * 5148 * - an historical default soft limit of 256 per-process file 5149 * descriptors that is too low for many Java programs. 5150 * 5151 * - a design flaw where file descriptors created using stdio 5152 * fopen must be less than 256, _even_ when the first limit above 5153 * has been raised. This can cause calls to fopen (but not calls to 5154 * open, for example) to fail mysteriously, perhaps in 3rd party 5155 * native code (although the JDK itself uses fopen). One can hardly 5156 * criticize them for using this most standard of all functions. 5157 * 5158 * We attempt to make everything work anyways by: 5159 * 5160 * - raising the soft limit on per-process file descriptors beyond 5161 * 256 5162 * 5163 * - As of Solaris 10u4, we can request that Solaris raise the 256 5164 * stdio fopen limit by calling function enable_extended_FILE_stdio. 5165 * This is done in init_2 and recorded in enabled_extended_FILE_stdio 5166 * 5167 * - If we are stuck on an old (pre 10u4) Solaris system, we can 5168 * workaround the bug by remapping non-stdio file descriptors below 5169 * 256 to ones beyond 256, which is done below. 5170 * 5171 * See: 5172 * 1085341: 32-bit stdio routines should support file descriptors >255 5173 * 6533291: Work around 32-bit Solaris stdio limit of 256 open files 5174 * 6431278: Netbeans crash on 32 bit Solaris: need to call 5175 * enable_extended_FILE_stdio() in VM initialisation 5176 * Giri Mandalika's blog 5177 * http://technopark02.blogspot.com/2005_05_01_archive.html 5178 */ 5179 #ifndef _LP64 5180 if ((!enabled_extended_FILE_stdio) && fd < 256) { 5181 int newfd = ::fcntl(fd, F_DUPFD, 256); 5182 if (newfd != -1) { 5183 ::close(fd); 5184 fd = newfd; 5185 } 5186 } 5187 #endif // 32-bit Solaris 5188 /* 5189 * All file descriptors that are opened in the JVM and not 5190 * specifically destined for a subprocess should have the 5191 * close-on-exec flag set. If we don't set it, then careless 3rd 5192 * party native code might fork and exec without closing all 5193 * appropriate file descriptors (e.g. as we do in closeDescriptors in 5194 * UNIXProcess.c), and this in turn might: 5195 * 5196 * - cause end-of-file to fail to be detected on some file 5197 * descriptors, resulting in mysterious hangs, or 5198 * 5199 * - might cause an fopen in the subprocess to fail on a system 5200 * suffering from bug 1085341. 5201 * 5202 * (Yes, the default setting of the close-on-exec flag is a Unix 5203 * design flaw) 5204 * 5205 * See: 5206 * 1085341: 32-bit stdio routines should support file descriptors >255 5207 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed 5208 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 5209 */ 5210 #ifdef FD_CLOEXEC 5211 { 5212 int flags = ::fcntl(fd, F_GETFD); 5213 if (flags != -1) 5214 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 5215 } 5216 #endif 5217 5218 if (o_delete != 0) { 5219 ::unlink(path); 5220 } 5221 return fd; 5222 } 5223 5224 // create binary file, rewriting existing file if required 5225 int os::create_binary_file(const char* path, bool rewrite_existing) { 5226 int oflags = O_WRONLY | O_CREAT; 5227 if (!rewrite_existing) { 5228 oflags |= O_EXCL; 5229 } 5230 return ::open64(path, oflags, S_IREAD | S_IWRITE); 5231 } 5232 5233 // return current position of file pointer 5234 jlong os::current_file_offset(int fd) { 5235 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 5236 } 5237 5238 // move file pointer to the specified offset 5239 jlong os::seek_to_file_offset(int fd, jlong offset) { 5240 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 5241 } 5242 5243 jlong os::lseek(int fd, jlong offset, int whence) { 5244 return (jlong) ::lseek64(fd, offset, whence); 5245 } 5246 5247 char * os::native_path(char *path) { 5248 return path; 5249 } 5250 5251 int os::ftruncate(int fd, jlong length) { 5252 return ::ftruncate64(fd, length); 5253 } 5254 5255 int os::fsync(int fd) { 5256 RESTARTABLE_RETURN_INT(::fsync(fd)); 5257 } 5258 5259 int os::available(int fd, jlong *bytes) { 5260 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5261 "Assumed _thread_in_native"); 5262 jlong cur, end; 5263 int mode; 5264 struct stat64 buf64; 5265 5266 if (::fstat64(fd, &buf64) >= 0) { 5267 mode = buf64.st_mode; 5268 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 5269 int n,ioctl_return; 5270 5271 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return); 5272 if (ioctl_return>= 0) { 5273 *bytes = n; 5274 return 1; 5275 } 5276 } 5277 } 5278 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 5279 return 0; 5280 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 5281 return 0; 5282 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 5283 return 0; 5284 } 5285 *bytes = end - cur; 5286 return 1; 5287 } 5288 5289 // Map a block of memory. 5290 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 5291 char *addr, size_t bytes, bool read_only, 5292 bool allow_exec) { 5293 int prot; 5294 int flags; 5295 5296 if (read_only) { 5297 prot = PROT_READ; 5298 flags = MAP_SHARED; 5299 } else { 5300 prot = PROT_READ | PROT_WRITE; 5301 flags = MAP_PRIVATE; 5302 } 5303 5304 if (allow_exec) { 5305 prot |= PROT_EXEC; 5306 } 5307 5308 if (addr != NULL) { 5309 flags |= MAP_FIXED; 5310 } 5311 5312 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 5313 fd, file_offset); 5314 if (mapped_address == MAP_FAILED) { 5315 return NULL; 5316 } 5317 return mapped_address; 5318 } 5319 5320 5321 // Remap a block of memory. 5322 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 5323 char *addr, size_t bytes, bool read_only, 5324 bool allow_exec) { 5325 // same as map_memory() on this OS 5326 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 5327 allow_exec); 5328 } 5329 5330 5331 // Unmap a block of memory. 5332 bool os::pd_unmap_memory(char* addr, size_t bytes) { 5333 return munmap(addr, bytes) == 0; 5334 } 5335 5336 void os::pause() { 5337 char filename[MAX_PATH]; 5338 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 5339 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 5340 } else { 5341 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 5342 } 5343 5344 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 5345 if (fd != -1) { 5346 struct stat buf; 5347 ::close(fd); 5348 while (::stat(filename, &buf) == 0) { 5349 (void)::poll(NULL, 0, 100); 5350 } 5351 } else { 5352 jio_fprintf(stderr, 5353 "Could not open pause file '%s', continuing immediately.\n", filename); 5354 } 5355 } 5356 5357 #ifndef PRODUCT 5358 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 5359 // Turn this on if you need to trace synch operations. 5360 // Set RECORD_SYNCH_LIMIT to a large-enough value, 5361 // and call record_synch_enable and record_synch_disable 5362 // around the computation of interest. 5363 5364 void record_synch(char* name, bool returning); // defined below 5365 5366 class RecordSynch { 5367 char* _name; 5368 public: 5369 RecordSynch(char* name) :_name(name) 5370 { record_synch(_name, false); } 5371 ~RecordSynch() { record_synch(_name, true); } 5372 }; 5373 5374 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 5375 extern "C" ret name params { \ 5376 typedef ret name##_t params; \ 5377 static name##_t* implem = NULL; \ 5378 static int callcount = 0; \ 5379 if (implem == NULL) { \ 5380 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 5381 if (implem == NULL) fatal(dlerror()); \ 5382 } \ 5383 ++callcount; \ 5384 RecordSynch _rs(#name); \ 5385 inner; \ 5386 return implem args; \ 5387 } 5388 // in dbx, examine callcounts this way: 5389 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 5390 5391 #define CHECK_POINTER_OK(p) \ 5392 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) 5393 #define CHECK_MU \ 5394 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 5395 #define CHECK_CV \ 5396 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 5397 #define CHECK_P(p) \ 5398 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 5399 5400 #define CHECK_MUTEX(mutex_op) \ 5401 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 5402 5403 CHECK_MUTEX( mutex_lock) 5404 CHECK_MUTEX( _mutex_lock) 5405 CHECK_MUTEX( mutex_unlock) 5406 CHECK_MUTEX(_mutex_unlock) 5407 CHECK_MUTEX( mutex_trylock) 5408 CHECK_MUTEX(_mutex_trylock) 5409 5410 #define CHECK_COND(cond_op) \ 5411 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV); 5412 5413 CHECK_COND( cond_wait); 5414 CHECK_COND(_cond_wait); 5415 CHECK_COND(_cond_wait_cancel); 5416 5417 #define CHECK_COND2(cond_op) \ 5418 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV); 5419 5420 CHECK_COND2( cond_timedwait); 5421 CHECK_COND2(_cond_timedwait); 5422 CHECK_COND2(_cond_timedwait_cancel); 5423 5424 // do the _lwp_* versions too 5425 #define mutex_t lwp_mutex_t 5426 #define cond_t lwp_cond_t 5427 CHECK_MUTEX( _lwp_mutex_lock) 5428 CHECK_MUTEX( _lwp_mutex_unlock) 5429 CHECK_MUTEX( _lwp_mutex_trylock) 5430 CHECK_MUTEX( __lwp_mutex_lock) 5431 CHECK_MUTEX( __lwp_mutex_unlock) 5432 CHECK_MUTEX( __lwp_mutex_trylock) 5433 CHECK_MUTEX(___lwp_mutex_lock) 5434 CHECK_MUTEX(___lwp_mutex_unlock) 5435 5436 CHECK_COND( _lwp_cond_wait); 5437 CHECK_COND( __lwp_cond_wait); 5438 CHECK_COND(___lwp_cond_wait); 5439 5440 CHECK_COND2( _lwp_cond_timedwait); 5441 CHECK_COND2( __lwp_cond_timedwait); 5442 #undef mutex_t 5443 #undef cond_t 5444 5445 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 5446 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 5447 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 5448 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 5449 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 5450 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 5451 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 5452 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 5453 5454 5455 // recording machinery: 5456 5457 enum { RECORD_SYNCH_LIMIT = 200 }; 5458 char* record_synch_name[RECORD_SYNCH_LIMIT]; 5459 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 5460 bool record_synch_returning[RECORD_SYNCH_LIMIT]; 5461 thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 5462 int record_synch_count = 0; 5463 bool record_synch_enabled = false; 5464 5465 // in dbx, examine recorded data this way: 5466 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 5467 5468 void record_synch(char* name, bool returning) { 5469 if (record_synch_enabled) { 5470 if (record_synch_count < RECORD_SYNCH_LIMIT) { 5471 record_synch_name[record_synch_count] = name; 5472 record_synch_returning[record_synch_count] = returning; 5473 record_synch_thread[record_synch_count] = thr_self(); 5474 record_synch_arg0ptr[record_synch_count] = &name; 5475 record_synch_count++; 5476 } 5477 // put more checking code here: 5478 // ... 5479 } 5480 } 5481 5482 void record_synch_enable() { 5483 // start collecting trace data, if not already doing so 5484 if (!record_synch_enabled) record_synch_count = 0; 5485 record_synch_enabled = true; 5486 } 5487 5488 void record_synch_disable() { 5489 // stop collecting trace data 5490 record_synch_enabled = false; 5491 } 5492 5493 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 5494 #endif // PRODUCT 5495 5496 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 5497 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 5498 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 5499 5500 5501 // JVMTI & JVM monitoring and management support 5502 // The thread_cpu_time() and current_thread_cpu_time() are only 5503 // supported if is_thread_cpu_time_supported() returns true. 5504 // They are not supported on Solaris T1. 5505 5506 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 5507 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 5508 // of a thread. 5509 // 5510 // current_thread_cpu_time() and thread_cpu_time(Thread *) 5511 // returns the fast estimate available on the platform. 5512 5513 // hrtime_t gethrvtime() return value includes 5514 // user time but does not include system time 5515 jlong os::current_thread_cpu_time() { 5516 return (jlong) gethrvtime(); 5517 } 5518 5519 jlong os::thread_cpu_time(Thread *thread) { 5520 // return user level CPU time only to be consistent with 5521 // what current_thread_cpu_time returns. 5522 // thread_cpu_time_info() must be changed if this changes 5523 return os::thread_cpu_time(thread, false /* user time only */); 5524 } 5525 5526 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 5527 if (user_sys_cpu_time) { 5528 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 5529 } else { 5530 return os::current_thread_cpu_time(); 5531 } 5532 } 5533 5534 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 5535 char proc_name[64]; 5536 int count; 5537 prusage_t prusage; 5538 jlong lwp_time; 5539 int fd; 5540 5541 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 5542 getpid(), 5543 thread->osthread()->lwp_id()); 5544 fd = ::open(proc_name, O_RDONLY); 5545 if ( fd == -1 ) return -1; 5546 5547 do { 5548 count = ::pread(fd, 5549 (void *)&prusage.pr_utime, 5550 thr_time_size, 5551 thr_time_off); 5552 } while (count < 0 && errno == EINTR); 5553 ::close(fd); 5554 if ( count < 0 ) return -1; 5555 5556 if (user_sys_cpu_time) { 5557 // user + system CPU time 5558 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 5559 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 5560 (jlong)prusage.pr_stime.tv_nsec + 5561 (jlong)prusage.pr_utime.tv_nsec; 5562 } else { 5563 // user level CPU time only 5564 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 5565 (jlong)prusage.pr_utime.tv_nsec; 5566 } 5567 5568 return(lwp_time); 5569 } 5570 5571 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5572 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5573 info_ptr->may_skip_backward = false; // elapsed time not wall time 5574 info_ptr->may_skip_forward = false; // elapsed time not wall time 5575 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5576 } 5577 5578 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5579 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5580 info_ptr->may_skip_backward = false; // elapsed time not wall time 5581 info_ptr->may_skip_forward = false; // elapsed time not wall time 5582 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5583 } 5584 5585 bool os::is_thread_cpu_time_supported() { 5586 if ( os::Solaris::T2_libthread() || UseBoundThreads ) { 5587 return true; 5588 } else { 5589 return false; 5590 } 5591 } 5592 5593 // System loadavg support. Returns -1 if load average cannot be obtained. 5594 // Return the load average for our processor set if the primitive exists 5595 // (Solaris 9 and later). Otherwise just return system wide loadavg. 5596 int os::loadavg(double loadavg[], int nelem) { 5597 if (pset_getloadavg_ptr != NULL) { 5598 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 5599 } else { 5600 return ::getloadavg(loadavg, nelem); 5601 } 5602 } 5603 5604 //--------------------------------------------------------------------------------- 5605 5606 bool os::find(address addr, outputStream* st) { 5607 Dl_info dlinfo; 5608 memset(&dlinfo, 0, sizeof(dlinfo)); 5609 if (dladdr(addr, &dlinfo) != 0) { 5610 st->print(PTR_FORMAT ": ", addr); 5611 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 5612 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 5613 } else if (dlinfo.dli_fbase != NULL) 5614 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 5615 else 5616 st->print("<absolute address>"); 5617 if (dlinfo.dli_fname != NULL) { 5618 st->print(" in %s", dlinfo.dli_fname); 5619 } 5620 if (dlinfo.dli_fbase != NULL) { 5621 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 5622 } 5623 st->cr(); 5624 5625 if (Verbose) { 5626 // decode some bytes around the PC 5627 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 5628 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 5629 address lowest = (address) dlinfo.dli_sname; 5630 if (!lowest) lowest = (address) dlinfo.dli_fbase; 5631 if (begin < lowest) begin = lowest; 5632 Dl_info dlinfo2; 5633 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 5634 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) 5635 end = (address) dlinfo2.dli_saddr; 5636 Disassembler::decode(begin, end, st); 5637 } 5638 return true; 5639 } 5640 return false; 5641 } 5642 5643 // Following function has been added to support HotSparc's libjvm.so running 5644 // under Solaris production JDK 1.2.2 / 1.3.0. These came from 5645 // src/solaris/hpi/native_threads in the EVM codebase. 5646 // 5647 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 5648 // libraries and should thus be removed. We will leave it behind for a while 5649 // until we no longer want to able to run on top of 1.3.0 Solaris production 5650 // JDK. See 4341971. 5651 5652 #define STACK_SLACK 0x800 5653 5654 extern "C" { 5655 intptr_t sysThreadAvailableStackWithSlack() { 5656 stack_t st; 5657 intptr_t retval, stack_top; 5658 retval = thr_stksegment(&st); 5659 assert(retval == 0, "incorrect return value from thr_stksegment"); 5660 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 5661 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 5662 stack_top=(intptr_t)st.ss_sp-st.ss_size; 5663 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 5664 } 5665 } 5666 5667 // ObjectMonitor park-unpark infrastructure ... 5668 // 5669 // We implement Solaris and Linux PlatformEvents with the 5670 // obvious condvar-mutex-flag triple. 5671 // Another alternative that works quite well is pipes: 5672 // Each PlatformEvent consists of a pipe-pair. 5673 // The thread associated with the PlatformEvent 5674 // calls park(), which reads from the input end of the pipe. 5675 // Unpark() writes into the other end of the pipe. 5676 // The write-side of the pipe must be set NDELAY. 5677 // Unfortunately pipes consume a large # of handles. 5678 // Native solaris lwp_park() and lwp_unpark() work nicely, too. 5679 // Using pipes for the 1st few threads might be workable, however. 5680 // 5681 // park() is permitted to return spuriously. 5682 // Callers of park() should wrap the call to park() in 5683 // an appropriate loop. A litmus test for the correct 5684 // usage of park is the following: if park() were modified 5685 // to immediately return 0 your code should still work, 5686 // albeit degenerating to a spin loop. 5687 // 5688 // An interesting optimization for park() is to use a trylock() 5689 // to attempt to acquire the mutex. If the trylock() fails 5690 // then we know that a concurrent unpark() operation is in-progress. 5691 // in that case the park() code could simply set _count to 0 5692 // and return immediately. The subsequent park() operation *might* 5693 // return immediately. That's harmless as the caller of park() is 5694 // expected to loop. By using trylock() we will have avoided a 5695 // avoided a context switch caused by contention on the per-thread mutex. 5696 // 5697 // TODO-FIXME: 5698 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the 5699 // objectmonitor implementation. 5700 // 2. Collapse the JSR166 parker event, and the 5701 // objectmonitor ParkEvent into a single "Event" construct. 5702 // 3. In park() and unpark() add: 5703 // assert (Thread::current() == AssociatedWith). 5704 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch. 5705 // 1-out-of-N park() operations will return immediately. 5706 // 5707 // _Event transitions in park() 5708 // -1 => -1 : illegal 5709 // 1 => 0 : pass - return immediately 5710 // 0 => -1 : block 5711 // 5712 // _Event serves as a restricted-range semaphore. 5713 // 5714 // Another possible encoding of _Event would be with 5715 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5716 // 5717 // TODO-FIXME: add DTRACE probes for: 5718 // 1. Tx parks 5719 // 2. Ty unparks Tx 5720 // 3. Tx resumes from park 5721 5722 5723 // value determined through experimentation 5724 #define ROUNDINGFIX 11 5725 5726 // utility to compute the abstime argument to timedwait. 5727 // TODO-FIXME: switch from compute_abstime() to unpackTime(). 5728 5729 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 5730 // millis is the relative timeout time 5731 // abstime will be the absolute timeout time 5732 if (millis < 0) millis = 0; 5733 struct timeval now; 5734 int status = gettimeofday(&now, NULL); 5735 assert(status == 0, "gettimeofday"); 5736 jlong seconds = millis / 1000; 5737 jlong max_wait_period; 5738 5739 if (UseLWPSynchronization) { 5740 // forward port of fix for 4275818 (not sleeping long enough) 5741 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 5742 // _lwp_cond_timedwait() used a round_down algorithm rather 5743 // than a round_up. For millis less than our roundfactor 5744 // it rounded down to 0 which doesn't meet the spec. 5745 // For millis > roundfactor we may return a bit sooner, but 5746 // since we can not accurately identify the patch level and 5747 // this has already been fixed in Solaris 9 and 8 we will 5748 // leave it alone rather than always rounding down. 5749 5750 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 5751 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 5752 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 5753 max_wait_period = 21000000; 5754 } else { 5755 max_wait_period = 50000000; 5756 } 5757 millis %= 1000; 5758 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 5759 seconds = max_wait_period; 5760 } 5761 abstime->tv_sec = now.tv_sec + seconds; 5762 long usec = now.tv_usec + millis * 1000; 5763 if (usec >= 1000000) { 5764 abstime->tv_sec += 1; 5765 usec -= 1000000; 5766 } 5767 abstime->tv_nsec = usec * 1000; 5768 return abstime; 5769 } 5770 5771 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. 5772 // Conceptually TryPark() should be equivalent to park(0). 5773 5774 int os::PlatformEvent::TryPark() { 5775 for (;;) { 5776 const int v = _Event ; 5777 guarantee ((v == 0) || (v == 1), "invariant") ; 5778 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; 5779 } 5780 } 5781 5782 void os::PlatformEvent::park() { // AKA: down() 5783 // Invariant: Only the thread associated with the Event/PlatformEvent 5784 // may call park(). 5785 int v ; 5786 for (;;) { 5787 v = _Event ; 5788 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 5789 } 5790 guarantee (v >= 0, "invariant") ; 5791 if (v == 0) { 5792 // Do this the hard way by blocking ... 5793 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5794 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5795 // Only for SPARC >= V8PlusA 5796 #if defined(__sparc) && defined(COMPILER2) 5797 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 5798 #endif 5799 int status = os::Solaris::mutex_lock(_mutex); 5800 assert_status(status == 0, status, "mutex_lock"); 5801 guarantee (_nParked == 0, "invariant") ; 5802 ++ _nParked ; 5803 while (_Event < 0) { 5804 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 5805 // Treat this the same as if the wait was interrupted 5806 // With usr/lib/lwp going to kernel, always handle ETIME 5807 status = os::Solaris::cond_wait(_cond, _mutex); 5808 if (status == ETIME) status = EINTR ; 5809 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 5810 } 5811 -- _nParked ; 5812 _Event = 0 ; 5813 status = os::Solaris::mutex_unlock(_mutex); 5814 assert_status(status == 0, status, "mutex_unlock"); 5815 // Paranoia to ensure our locked and lock-free paths interact 5816 // correctly with each other. 5817 OrderAccess::fence(); 5818 } 5819 } 5820 5821 int os::PlatformEvent::park(jlong millis) { 5822 guarantee (_nParked == 0, "invariant") ; 5823 int v ; 5824 for (;;) { 5825 v = _Event ; 5826 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 5827 } 5828 guarantee (v >= 0, "invariant") ; 5829 if (v != 0) return OS_OK ; 5830 5831 int ret = OS_TIMEOUT; 5832 timestruc_t abst; 5833 compute_abstime (&abst, millis); 5834 5835 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5836 // For Solaris SPARC set fprs.FEF=0 prior to parking. 5837 // Only for SPARC >= V8PlusA 5838 #if defined(__sparc) && defined(COMPILER2) 5839 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 5840 #endif 5841 int status = os::Solaris::mutex_lock(_mutex); 5842 assert_status(status == 0, status, "mutex_lock"); 5843 guarantee (_nParked == 0, "invariant") ; 5844 ++ _nParked ; 5845 while (_Event < 0) { 5846 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 5847 assert_status(status == 0 || status == EINTR || 5848 status == ETIME || status == ETIMEDOUT, 5849 status, "cond_timedwait"); 5850 if (!FilterSpuriousWakeups) break ; // previous semantics 5851 if (status == ETIME || status == ETIMEDOUT) break ; 5852 // We consume and ignore EINTR and spurious wakeups. 5853 } 5854 -- _nParked ; 5855 if (_Event >= 0) ret = OS_OK ; 5856 _Event = 0 ; 5857 status = os::Solaris::mutex_unlock(_mutex); 5858 assert_status(status == 0, status, "mutex_unlock"); 5859 // Paranoia to ensure our locked and lock-free paths interact 5860 // correctly with each other. 5861 OrderAccess::fence(); 5862 return ret; 5863 } 5864 5865 void os::PlatformEvent::unpark() { 5866 // Transitions for _Event: 5867 // 0 :=> 1 5868 // 1 :=> 1 5869 // -1 :=> either 0 or 1; must signal target thread 5870 // That is, we can safely transition _Event from -1 to either 5871 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back 5872 // unpark() calls. 5873 // See also: "Semaphores in Plan 9" by Mullender & Cox 5874 // 5875 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5876 // that it will take two back-to-back park() calls for the owning 5877 // thread to block. This has the benefit of forcing a spurious return 5878 // from the first park() call after an unpark() call which will help 5879 // shake out uses of park() and unpark() without condition variables. 5880 5881 if (Atomic::xchg(1, &_Event) >= 0) return; 5882 5883 // If the thread associated with the event was parked, wake it. 5884 // Wait for the thread assoc with the PlatformEvent to vacate. 5885 int status = os::Solaris::mutex_lock(_mutex); 5886 assert_status(status == 0, status, "mutex_lock"); 5887 int AnyWaiters = _nParked; 5888 status = os::Solaris::mutex_unlock(_mutex); 5889 assert_status(status == 0, status, "mutex_unlock"); 5890 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 5891 if (AnyWaiters != 0) { 5892 // We intentional signal *after* dropping the lock 5893 // to avoid a common class of futile wakeups. 5894 status = os::Solaris::cond_signal(_cond); 5895 assert_status(status == 0, status, "cond_signal"); 5896 } 5897 } 5898 5899 // JSR166 5900 // ------------------------------------------------------- 5901 5902 /* 5903 * The solaris and linux implementations of park/unpark are fairly 5904 * conservative for now, but can be improved. They currently use a 5905 * mutex/condvar pair, plus _counter. 5906 * Park decrements _counter if > 0, else does a condvar wait. Unpark 5907 * sets count to 1 and signals condvar. Only one thread ever waits 5908 * on the condvar. Contention seen when trying to park implies that someone 5909 * is unparking you, so don't wait. And spurious returns are fine, so there 5910 * is no need to track notifications. 5911 */ 5912 5913 #define MAX_SECS 100000000 5914 /* 5915 * This code is common to linux and solaris and will be moved to a 5916 * common place in dolphin. 5917 * 5918 * The passed in time value is either a relative time in nanoseconds 5919 * or an absolute time in milliseconds. Either way it has to be unpacked 5920 * into suitable seconds and nanoseconds components and stored in the 5921 * given timespec structure. 5922 * Given time is a 64-bit value and the time_t used in the timespec is only 5923 * a signed-32-bit value (except on 64-bit Linux) we have to watch for 5924 * overflow if times way in the future are given. Further on Solaris versions 5925 * prior to 10 there is a restriction (see cond_timedwait) that the specified 5926 * number of seconds, in abstime, is less than current_time + 100,000,000. 5927 * As it will be 28 years before "now + 100000000" will overflow we can 5928 * ignore overflow and just impose a hard-limit on seconds using the value 5929 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 5930 * years from "now". 5931 */ 5932 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 5933 assert (time > 0, "convertTime"); 5934 5935 struct timeval now; 5936 int status = gettimeofday(&now, NULL); 5937 assert(status == 0, "gettimeofday"); 5938 5939 time_t max_secs = now.tv_sec + MAX_SECS; 5940 5941 if (isAbsolute) { 5942 jlong secs = time / 1000; 5943 if (secs > max_secs) { 5944 absTime->tv_sec = max_secs; 5945 } 5946 else { 5947 absTime->tv_sec = secs; 5948 } 5949 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 5950 } 5951 else { 5952 jlong secs = time / NANOSECS_PER_SEC; 5953 if (secs >= MAX_SECS) { 5954 absTime->tv_sec = max_secs; 5955 absTime->tv_nsec = 0; 5956 } 5957 else { 5958 absTime->tv_sec = now.tv_sec + secs; 5959 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 5960 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 5961 absTime->tv_nsec -= NANOSECS_PER_SEC; 5962 ++absTime->tv_sec; // note: this must be <= max_secs 5963 } 5964 } 5965 } 5966 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 5967 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 5968 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 5969 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 5970 } 5971 5972 void Parker::park(bool isAbsolute, jlong time) { 5973 // Ideally we'd do something useful while spinning, such 5974 // as calling unpackTime(). 5975 5976 // Optional fast-path check: 5977 // Return immediately if a permit is available. 5978 // We depend on Atomic::xchg() having full barrier semantics 5979 // since we are doing a lock-free update to _counter. 5980 if (Atomic::xchg(0, &_counter) > 0) return; 5981 5982 // Optional fast-exit: Check interrupt before trying to wait 5983 Thread* thread = Thread::current(); 5984 assert(thread->is_Java_thread(), "Must be JavaThread"); 5985 JavaThread *jt = (JavaThread *)thread; 5986 if (Thread::is_interrupted(thread, false)) { 5987 return; 5988 } 5989 5990 // First, demultiplex/decode time arguments 5991 timespec absTime; 5992 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all 5993 return; 5994 } 5995 if (time > 0) { 5996 // Warning: this code might be exposed to the old Solaris time 5997 // round-down bugs. Grep "roundingFix" for details. 5998 unpackTime(&absTime, isAbsolute, time); 5999 } 6000 6001 // Enter safepoint region 6002 // Beware of deadlocks such as 6317397. 6003 // The per-thread Parker:: _mutex is a classic leaf-lock. 6004 // In particular a thread must never block on the Threads_lock while 6005 // holding the Parker:: mutex. If safepoints are pending both the 6006 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 6007 ThreadBlockInVM tbivm(jt); 6008 6009 // Don't wait if cannot get lock since interference arises from 6010 // unblocking. Also. check interrupt before trying wait 6011 if (Thread::is_interrupted(thread, false) || 6012 os::Solaris::mutex_trylock(_mutex) != 0) { 6013 return; 6014 } 6015 6016 int status ; 6017 6018 if (_counter > 0) { // no wait needed 6019 _counter = 0; 6020 status = os::Solaris::mutex_unlock(_mutex); 6021 assert (status == 0, "invariant") ; 6022 // Paranoia to ensure our locked and lock-free paths interact 6023 // correctly with each other and Java-level accesses. 6024 OrderAccess::fence(); 6025 return; 6026 } 6027 6028 #ifdef ASSERT 6029 // Don't catch signals while blocked; let the running threads have the signals. 6030 // (This allows a debugger to break into the running thread.) 6031 sigset_t oldsigs; 6032 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals(); 6033 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 6034 #endif 6035 6036 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 6037 jt->set_suspend_equivalent(); 6038 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 6039 6040 // Do this the hard way by blocking ... 6041 // See http://monaco.sfbay/detail.jsf?cr=5094058. 6042 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 6043 // Only for SPARC >= V8PlusA 6044 #if defined(__sparc) && defined(COMPILER2) 6045 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 6046 #endif 6047 6048 if (time == 0) { 6049 status = os::Solaris::cond_wait (_cond, _mutex) ; 6050 } else { 6051 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 6052 } 6053 // Note that an untimed cond_wait() can sometimes return ETIME on older 6054 // versions of the Solaris. 6055 assert_status(status == 0 || status == EINTR || 6056 status == ETIME || status == ETIMEDOUT, 6057 status, "cond_timedwait"); 6058 6059 #ifdef ASSERT 6060 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL); 6061 #endif 6062 _counter = 0 ; 6063 status = os::Solaris::mutex_unlock(_mutex); 6064 assert_status(status == 0, status, "mutex_unlock") ; 6065 // Paranoia to ensure our locked and lock-free paths interact 6066 // correctly with each other and Java-level accesses. 6067 OrderAccess::fence(); 6068 6069 // If externally suspended while waiting, re-suspend 6070 if (jt->handle_special_suspend_equivalent_condition()) { 6071 jt->java_suspend_self(); 6072 } 6073 } 6074 6075 void Parker::unpark() { 6076 int s, status ; 6077 status = os::Solaris::mutex_lock (_mutex) ; 6078 assert (status == 0, "invariant") ; 6079 s = _counter; 6080 _counter = 1; 6081 status = os::Solaris::mutex_unlock (_mutex) ; 6082 assert (status == 0, "invariant") ; 6083 6084 if (s < 1) { 6085 status = os::Solaris::cond_signal (_cond) ; 6086 assert (status == 0, "invariant") ; 6087 } 6088 } 6089 6090 extern char** environ; 6091 6092 // Run the specified command in a separate process. Return its exit value, 6093 // or -1 on failure (e.g. can't fork a new process). 6094 // Unlike system(), this function can be called from signal handler. It 6095 // doesn't block SIGINT et al. 6096 int os::fork_and_exec(char* cmd) { 6097 char * argv[4]; 6098 argv[0] = (char *)"sh"; 6099 argv[1] = (char *)"-c"; 6100 argv[2] = cmd; 6101 argv[3] = NULL; 6102 6103 // fork is async-safe, fork1 is not so can't use in signal handler 6104 pid_t pid; 6105 Thread* t = ThreadLocalStorage::get_thread_slow(); 6106 if (t != NULL && t->is_inside_signal_handler()) { 6107 pid = fork(); 6108 } else { 6109 pid = fork1(); 6110 } 6111 6112 if (pid < 0) { 6113 // fork failed 6114 warning("fork failed: %s", strerror(errno)); 6115 return -1; 6116 6117 } else if (pid == 0) { 6118 // child process 6119 6120 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 6121 execve("/usr/bin/sh", argv, environ); 6122 6123 // execve failed 6124 _exit(-1); 6125 6126 } else { 6127 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 6128 // care about the actual exit code, for now. 6129 6130 int status; 6131 6132 // Wait for the child process to exit. This returns immediately if 6133 // the child has already exited. */ 6134 while (waitpid(pid, &status, 0) < 0) { 6135 switch (errno) { 6136 case ECHILD: return 0; 6137 case EINTR: break; 6138 default: return -1; 6139 } 6140 } 6141 6142 if (WIFEXITED(status)) { 6143 // The child exited normally; get its exit code. 6144 return WEXITSTATUS(status); 6145 } else if (WIFSIGNALED(status)) { 6146 // The child exited because of a signal 6147 // The best value to return is 0x80 + signal number, 6148 // because that is what all Unix shells do, and because 6149 // it allows callers to distinguish between process exit and 6150 // process death by signal. 6151 return 0x80 + WTERMSIG(status); 6152 } else { 6153 // Unknown exit code; pass it through 6154 return status; 6155 } 6156 } 6157 } 6158 6159 // is_headless_jre() 6160 // 6161 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 6162 // in order to report if we are running in a headless jre 6163 // 6164 // Since JDK8 xawt/libmawt.so was moved into the same directory 6165 // as libawt.so, and renamed libawt_xawt.so 6166 // 6167 bool os::is_headless_jre() { 6168 struct stat statbuf; 6169 char buf[MAXPATHLEN]; 6170 char libmawtpath[MAXPATHLEN]; 6171 const char *xawtstr = "/xawt/libmawt.so"; 6172 const char *new_xawtstr = "/libawt_xawt.so"; 6173 char *p; 6174 6175 // Get path to libjvm.so 6176 os::jvm_path(buf, sizeof(buf)); 6177 6178 // Get rid of libjvm.so 6179 p = strrchr(buf, '/'); 6180 if (p == NULL) return false; 6181 else *p = '\0'; 6182 6183 // Get rid of client or server 6184 p = strrchr(buf, '/'); 6185 if (p == NULL) return false; 6186 else *p = '\0'; 6187 6188 // check xawt/libmawt.so 6189 strcpy(libmawtpath, buf); 6190 strcat(libmawtpath, xawtstr); 6191 if (::stat(libmawtpath, &statbuf) == 0) return false; 6192 6193 // check libawt_xawt.so 6194 strcpy(libmawtpath, buf); 6195 strcat(libmawtpath, new_xawtstr); 6196 if (::stat(libmawtpath, &statbuf) == 0) return false; 6197 6198 return true; 6199 } 6200 6201 size_t os::write(int fd, const void *buf, unsigned int nBytes) { 6202 size_t res; 6203 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 6204 "Assumed _thread_in_native"); 6205 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res); 6206 return res; 6207 } 6208 6209 int os::close(int fd) { 6210 return ::close(fd); 6211 } 6212 6213 int os::socket_close(int fd) { 6214 return ::close(fd); 6215 } 6216 6217 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 6218 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 6219 "Assumed _thread_in_native"); 6220 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags)); 6221 } 6222 6223 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 6224 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 6225 "Assumed _thread_in_native"); 6226 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 6227 } 6228 6229 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 6230 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 6231 } 6232 6233 // As both poll and select can be interrupted by signals, we have to be 6234 // prepared to restart the system call after updating the timeout, unless 6235 // a poll() is done with timeout == -1, in which case we repeat with this 6236 // "wait forever" value. 6237 6238 int os::timeout(int fd, long timeout) { 6239 int res; 6240 struct timeval t; 6241 julong prevtime, newtime; 6242 static const char* aNull = 0; 6243 struct pollfd pfd; 6244 pfd.fd = fd; 6245 pfd.events = POLLIN; 6246 6247 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 6248 "Assumed _thread_in_native"); 6249 6250 gettimeofday(&t, &aNull); 6251 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000; 6252 6253 for(;;) { 6254 res = ::poll(&pfd, 1, timeout); 6255 if(res == OS_ERR && errno == EINTR) { 6256 if(timeout != -1) { 6257 gettimeofday(&t, &aNull); 6258 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec /1000; 6259 timeout -= newtime - prevtime; 6260 if(timeout <= 0) 6261 return OS_OK; 6262 prevtime = newtime; 6263 } 6264 } else return res; 6265 } 6266 } 6267 6268 int os::connect(int fd, struct sockaddr *him, socklen_t len) { 6269 int _result; 6270 _result = ::connect(fd, him, len); 6271 6272 // On Solaris, when a connect() call is interrupted, the connection 6273 // can be established asynchronously (see 6343810). Subsequent calls 6274 // to connect() must check the errno value which has the semantic 6275 // described below (copied from the connect() man page). Handling 6276 // of asynchronously established connections is required for both 6277 // blocking and non-blocking sockets. 6278 // EINTR The connection attempt was interrupted 6279 // before any data arrived by the delivery of 6280 // a signal. The connection, however, will be 6281 // established asynchronously. 6282 // 6283 // EINPROGRESS The socket is non-blocking, and the connec- 6284 // tion cannot be completed immediately. 6285 // 6286 // EALREADY The socket is non-blocking, and a previous 6287 // connection attempt has not yet been com- 6288 // pleted. 6289 // 6290 // EISCONN The socket is already connected. 6291 if (_result == OS_ERR && errno == EINTR) { 6292 /* restarting a connect() changes its errno semantics */ 6293 RESTARTABLE(::connect(fd, him, len), _result); 6294 /* undo these changes */ 6295 if (_result == OS_ERR) { 6296 if (errno == EALREADY) { 6297 errno = EINPROGRESS; /* fall through */ 6298 } else if (errno == EISCONN) { 6299 errno = 0; 6300 return OS_OK; 6301 } 6302 } 6303 } 6304 return _result; 6305 } 6306 6307 int os::accept(int fd, struct sockaddr* him, socklen_t* len) { 6308 if (fd < 0) { 6309 return OS_ERR; 6310 } 6311 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 6312 "Assumed _thread_in_native"); 6313 RESTARTABLE_RETURN_INT((int)::accept(fd, him, len)); 6314 } 6315 6316 int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags, 6317 sockaddr* from, socklen_t* fromlen) { 6318 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 6319 "Assumed _thread_in_native"); 6320 RESTARTABLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen)); 6321 } 6322 6323 int os::sendto(int fd, char* buf, size_t len, uint flags, 6324 struct sockaddr* to, socklen_t tolen) { 6325 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 6326 "Assumed _thread_in_native"); 6327 RESTARTABLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen)); 6328 } 6329 6330 int os::socket_available(int fd, jint *pbytes) { 6331 if (fd < 0) { 6332 return OS_OK; 6333 } 6334 int ret; 6335 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); 6336 // note: ioctl can return 0 when successful, JVM_SocketAvailable 6337 // is expected to return 0 on failure and 1 on success to the jdk. 6338 return (ret == OS_ERR) ? 0 : 1; 6339 } 6340 6341 int os::bind(int fd, struct sockaddr* him, socklen_t len) { 6342 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 6343 "Assumed _thread_in_native"); 6344 return ::bind(fd, him, len); 6345 } 6346 6347 // Get the default path to the core file 6348 // Returns the length of the string 6349 int os::get_core_path(char* buffer, size_t bufferSize) { 6350 const char* p = get_current_directory(buffer, bufferSize); 6351 6352 if (p == NULL) { 6353 assert(p != NULL, "failed to get current directory"); 6354 return 0; 6355 } 6356 6357 return strlen(buffer); 6358 } 6359 6360 #ifndef PRODUCT 6361 void TestReserveMemorySpecial_test() { 6362 // No tests available for this platform 6363 } 6364 #endif