| OLD | NEW |
|---|
| (Empty) |
| 1 // Copyright 2012 the V8 project authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 // Platform-specific code for POSIX goes here. This is not a platform on its | |
| 6 // own, but contains the parts which are the same across the POSIX platforms | |
| 7 // Linux, MacOS, FreeBSD, OpenBSD, NetBSD and QNX. | |
| 8 | |
| 9 #include <dlfcn.h> | |
| 10 #include <errno.h> | |
| 11 #include <limits.h> | |
| 12 #include <pthread.h> | |
| 13 #if defined(__DragonFly__) || defined(__FreeBSD__) || defined(__OpenBSD__) | |
| 14 #include <pthread_np.h> // for pthread_set_name_np | |
| 15 #endif | |
| 16 #include <sched.h> // for sched_yield | |
| 17 #include <time.h> | |
| 18 #include <unistd.h> | |
| 19 | |
| 20 #include <sys/mman.h> | |
| 21 #include <sys/resource.h> | |
| 22 #include <sys/stat.h> | |
| 23 #include <sys/time.h> | |
| 24 #include <sys/types.h> | |
| 25 | |
| 26 #if defined(__linux__) | |
| 27 #include <sys/prctl.h> // NOLINT, for prctl | |
| 28 #endif | |
| 29 #if defined(__APPLE__) || defined(__DragonFly__) || defined(__FreeBSD__) || \ | |
| 30 defined(__NetBSD__) || defined(__OpenBSD__) | |
| 31 #include <sys/sysctl.h> // NOLINT, for sysctl | |
| 32 #endif | |
| 33 | |
| 34 #include <arpa/inet.h> | |
| 35 #include <netdb.h> | |
| 36 #include <netinet/in.h> | |
| 37 | |
| 38 #undef MAP_TYPE | |
| 39 | |
| 40 #if defined(ANDROID) && !defined(V8_ANDROID_LOG_STDOUT) | |
| 41 #define LOG_TAG "v8" | |
| 42 #include <android/log.h> // NOLINT | |
| 43 #endif | |
| 44 | |
| 45 #include <cmath> | |
| 46 #include <cstdlib> | |
| 47 | |
| 48 #include "src/base/lazy-instance.h" | |
| 49 #include "src/base/macros.h" | |
| 50 #include "src/platform.h" | |
| 51 #include "src/platform/time.h" | |
| 52 #include "src/utils/random-number-generator.h" | |
| 53 | |
| 54 #ifdef V8_FAST_TLS_SUPPORTED | |
| 55 #include "src/base/atomicops.h" | |
| 56 #endif | |
| 57 | |
| 58 namespace v8 { | |
| 59 namespace internal { | |
| 60 | |
| 61 namespace { | |
| 62 | |
| 63 // 0 is never a valid thread id. | |
| 64 const pthread_t kNoThread = (pthread_t) 0; | |
| 65 | |
| 66 bool g_hard_abort = false; | |
| 67 | |
| 68 const char* g_gc_fake_mmap = NULL; | |
| 69 | |
| 70 } // namespace | |
| 71 | |
| 72 | |
| 73 int OS::NumberOfProcessorsOnline() { | |
| 74 return static_cast<int>(sysconf(_SC_NPROCESSORS_ONLN)); | |
| 75 } | |
| 76 | |
| 77 | |
| 78 // Maximum size of the virtual memory. 0 means there is no artificial | |
| 79 // limit. | |
| 80 | |
| 81 intptr_t OS::MaxVirtualMemory() { | |
| 82 struct rlimit limit; | |
| 83 int result = getrlimit(RLIMIT_DATA, &limit); | |
| 84 if (result != 0) return 0; | |
| 85 #if V8_OS_NACL | |
| 86 // The NaCl compiler doesn't like resource.h constants. | |
| 87 if (static_cast<int>(limit.rlim_cur) == -1) return 0; | |
| 88 #else | |
| 89 if (limit.rlim_cur == RLIM_INFINITY) return 0; | |
| 90 #endif | |
| 91 return limit.rlim_cur; | |
| 92 } | |
| 93 | |
| 94 | |
| 95 uint64_t OS::TotalPhysicalMemory() { | |
| 96 #if V8_OS_MACOSX | |
| 97 int mib[2]; | |
| 98 mib[0] = CTL_HW; | |
| 99 mib[1] = HW_MEMSIZE; | |
| 100 int64_t size = 0; | |
| 101 size_t len = sizeof(size); | |
| 102 if (sysctl(mib, 2, &size, &len, NULL, 0) != 0) { | |
| 103 UNREACHABLE(); | |
| 104 return 0; | |
| 105 } | |
| 106 return static_cast<uint64_t>(size); | |
| 107 #elif V8_OS_FREEBSD | |
| 108 int pages, page_size; | |
| 109 size_t size = sizeof(pages); | |
| 110 sysctlbyname("vm.stats.vm.v_page_count", &pages, &size, NULL, 0); | |
| 111 sysctlbyname("vm.stats.vm.v_page_size", &page_size, &size, NULL, 0); | |
| 112 if (pages == -1 || page_size == -1) { | |
| 113 UNREACHABLE(); | |
| 114 return 0; | |
| 115 } | |
| 116 return static_cast<uint64_t>(pages) * page_size; | |
| 117 #elif V8_OS_CYGWIN | |
| 118 MEMORYSTATUS memory_info; | |
| 119 memory_info.dwLength = sizeof(memory_info); | |
| 120 if (!GlobalMemoryStatus(&memory_info)) { | |
| 121 UNREACHABLE(); | |
| 122 return 0; | |
| 123 } | |
| 124 return static_cast<uint64_t>(memory_info.dwTotalPhys); | |
| 125 #elif V8_OS_QNX | |
| 126 struct stat stat_buf; | |
| 127 if (stat("/proc", &stat_buf) != 0) { | |
| 128 UNREACHABLE(); | |
| 129 return 0; | |
| 130 } | |
| 131 return static_cast<uint64_t>(stat_buf.st_size); | |
| 132 #else | |
| 133 intptr_t pages = sysconf(_SC_PHYS_PAGES); | |
| 134 intptr_t page_size = sysconf(_SC_PAGESIZE); | |
| 135 if (pages == -1 || page_size == -1) { | |
| 136 UNREACHABLE(); | |
| 137 return 0; | |
| 138 } | |
| 139 return static_cast<uint64_t>(pages) * page_size; | |
| 140 #endif | |
| 141 } | |
| 142 | |
| 143 | |
| 144 int OS::ActivationFrameAlignment() { | |
| 145 #if V8_TARGET_ARCH_ARM | |
| 146 // On EABI ARM targets this is required for fp correctness in the | |
| 147 // runtime system. | |
| 148 return 8; | |
| 149 #elif V8_TARGET_ARCH_MIPS | |
| 150 return 8; | |
| 151 #else | |
| 152 // Otherwise we just assume 16 byte alignment, i.e.: | |
| 153 // - With gcc 4.4 the tree vectorization optimizer can generate code | |
| 154 // that requires 16 byte alignment such as movdqa on x86. | |
| 155 // - Mac OS X and Solaris (64-bit) activation frames must be 16 byte-aligned; | |
| 156 // see "Mac OS X ABI Function Call Guide" | |
| 157 return 16; | |
| 158 #endif | |
| 159 } | |
| 160 | |
| 161 | |
| 162 intptr_t OS::CommitPageSize() { | |
| 163 static intptr_t page_size = getpagesize(); | |
| 164 return page_size; | |
| 165 } | |
| 166 | |
| 167 | |
| 168 void OS::Free(void* address, const size_t size) { | |
| 169 // TODO(1240712): munmap has a return value which is ignored here. | |
| 170 int result = munmap(address, size); | |
| 171 USE(result); | |
| 172 ASSERT(result == 0); | |
| 173 } | |
| 174 | |
| 175 | |
| 176 // Get rid of writable permission on code allocations. | |
| 177 void OS::ProtectCode(void* address, const size_t size) { | |
| 178 #if V8_OS_CYGWIN | |
| 179 DWORD old_protect; | |
| 180 VirtualProtect(address, size, PAGE_EXECUTE_READ, &old_protect); | |
| 181 #elif V8_OS_NACL | |
| 182 // The Native Client port of V8 uses an interpreter, so | |
| 183 // code pages don't need PROT_EXEC. | |
| 184 mprotect(address, size, PROT_READ); | |
| 185 #else | |
| 186 mprotect(address, size, PROT_READ | PROT_EXEC); | |
| 187 #endif | |
| 188 } | |
| 189 | |
| 190 | |
| 191 // Create guard pages. | |
| 192 void OS::Guard(void* address, const size_t size) { | |
| 193 #if V8_OS_CYGWIN | |
| 194 DWORD oldprotect; | |
| 195 VirtualProtect(address, size, PAGE_NOACCESS, &oldprotect); | |
| 196 #else | |
| 197 mprotect(address, size, PROT_NONE); | |
| 198 #endif | |
| 199 } | |
| 200 | |
| 201 | |
| 202 static base::LazyInstance<RandomNumberGenerator>::type | |
| 203 platform_random_number_generator = LAZY_INSTANCE_INITIALIZER; | |
| 204 | |
| 205 | |
| 206 void OS::Initialize(int64_t random_seed, bool hard_abort, | |
| 207 const char* const gc_fake_mmap) { | |
| 208 if (random_seed) { | |
| 209 platform_random_number_generator.Pointer()->SetSeed(random_seed); | |
| 210 } | |
| 211 g_hard_abort = hard_abort; | |
| 212 g_gc_fake_mmap = gc_fake_mmap; | |
| 213 } | |
| 214 | |
| 215 | |
| 216 const char* OS::GetGCFakeMMapFile() { | |
| 217 return g_gc_fake_mmap; | |
| 218 } | |
| 219 | |
| 220 | |
| 221 void* OS::GetRandomMmapAddr() { | |
| 222 #if V8_OS_NACL | |
| 223 // TODO(bradchen): restore randomization once Native Client gets | |
| 224 // smarter about using mmap address hints. | |
| 225 // See http://code.google.com/p/nativeclient/issues/3341 | |
| 226 return NULL; | |
| 227 #endif | |
| 228 #if defined(ADDRESS_SANITIZER) || defined(MEMORY_SANITIZER) || \ | |
| 229 defined(THREAD_SANITIZER) | |
| 230 // Dynamic tools do not support custom mmap addresses. | |
| 231 return NULL; | |
| 232 #endif | |
| 233 uintptr_t raw_addr; | |
| 234 platform_random_number_generator.Pointer()->NextBytes(&raw_addr, | |
| 235 sizeof(raw_addr)); | |
| 236 #if V8_TARGET_ARCH_X64 | |
| 237 // Currently available CPUs have 48 bits of virtual addressing. Truncate | |
| 238 // the hint address to 46 bits to give the kernel a fighting chance of | |
| 239 // fulfilling our placement request. | |
| 240 raw_addr &= V8_UINT64_C(0x3ffffffff000); | |
| 241 #else | |
| 242 raw_addr &= 0x3ffff000; | |
| 243 | |
| 244 # ifdef __sun | |
| 245 // For our Solaris/illumos mmap hint, we pick a random address in the bottom | |
| 246 // half of the top half of the address space (that is, the third quarter). | |
| 247 // Because we do not MAP_FIXED, this will be treated only as a hint -- the | |
| 248 // system will not fail to mmap() because something else happens to already | |
| 249 // be mapped at our random address. We deliberately set the hint high enough | |
| 250 // to get well above the system's break (that is, the heap); Solaris and | |
| 251 // illumos will try the hint and if that fails allocate as if there were | |
| 252 // no hint at all. The high hint prevents the break from getting hemmed in | |
| 253 // at low values, ceding half of the address space to the system heap. | |
| 254 raw_addr += 0x80000000; | |
| 255 # else | |
| 256 // The range 0x20000000 - 0x60000000 is relatively unpopulated across a | |
| 257 // variety of ASLR modes (PAE kernel, NX compat mode, etc) and on macos | |
| 258 // 10.6 and 10.7. | |
| 259 raw_addr += 0x20000000; | |
| 260 # endif | |
| 261 #endif | |
| 262 return reinterpret_cast<void*>(raw_addr); | |
| 263 } | |
| 264 | |
| 265 | |
| 266 size_t OS::AllocateAlignment() { | |
| 267 return static_cast<size_t>(sysconf(_SC_PAGESIZE)); | |
| 268 } | |
| 269 | |
| 270 | |
| 271 void OS::Sleep(int milliseconds) { | |
| 272 useconds_t ms = static_cast<useconds_t>(milliseconds); | |
| 273 usleep(1000 * ms); | |
| 274 } | |
| 275 | |
| 276 | |
| 277 void OS::Abort() { | |
| 278 if (g_hard_abort) { | |
| 279 V8_IMMEDIATE_CRASH(); | |
| 280 } | |
| 281 // Redirect to std abort to signal abnormal program termination. | |
| 282 abort(); | |
| 283 } | |
| 284 | |
| 285 | |
| 286 void OS::DebugBreak() { | |
| 287 #if V8_HOST_ARCH_ARM | |
| 288 asm("bkpt 0"); | |
| 289 #elif V8_HOST_ARCH_ARM64 | |
| 290 asm("brk 0"); | |
| 291 #elif V8_HOST_ARCH_MIPS | |
| 292 asm("break"); | |
| 293 #elif V8_HOST_ARCH_IA32 | |
| 294 #if defined(__native_client__) | |
| 295 asm("hlt"); | |
| 296 #else | |
| 297 asm("int $3"); | |
| 298 #endif // __native_client__ | |
| 299 #elif V8_HOST_ARCH_X64 | |
| 300 asm("int $3"); | |
| 301 #else | |
| 302 #error Unsupported host architecture. | |
| 303 #endif | |
| 304 } | |
| 305 | |
| 306 | |
| 307 // ---------------------------------------------------------------------------- | |
| 308 // Math functions | |
| 309 | |
| 310 double OS::nan_value() { | |
| 311 // NAN from math.h is defined in C99 and not in POSIX. | |
| 312 return NAN; | |
| 313 } | |
| 314 | |
| 315 | |
| 316 int OS::GetCurrentProcessId() { | |
| 317 return static_cast<int>(getpid()); | |
| 318 } | |
| 319 | |
| 320 | |
| 321 // ---------------------------------------------------------------------------- | |
| 322 // POSIX date/time support. | |
| 323 // | |
| 324 | |
| 325 int OS::GetUserTime(uint32_t* secs, uint32_t* usecs) { | |
| 326 struct rusage usage; | |
| 327 | |
| 328 if (getrusage(RUSAGE_SELF, &usage) < 0) return -1; | |
| 329 *secs = usage.ru_utime.tv_sec; | |
| 330 *usecs = usage.ru_utime.tv_usec; | |
| 331 return 0; | |
| 332 } | |
| 333 | |
| 334 | |
| 335 double OS::TimeCurrentMillis() { | |
| 336 return Time::Now().ToJsTime(); | |
| 337 } | |
| 338 | |
| 339 | |
| 340 class TimezoneCache {}; | |
| 341 | |
| 342 | |
| 343 TimezoneCache* OS::CreateTimezoneCache() { | |
| 344 return NULL; | |
| 345 } | |
| 346 | |
| 347 | |
| 348 void OS::DisposeTimezoneCache(TimezoneCache* cache) { | |
| 349 ASSERT(cache == NULL); | |
| 350 } | |
| 351 | |
| 352 | |
| 353 void OS::ClearTimezoneCache(TimezoneCache* cache) { | |
| 354 ASSERT(cache == NULL); | |
| 355 } | |
| 356 | |
| 357 | |
| 358 double OS::DaylightSavingsOffset(double time, TimezoneCache*) { | |
| 359 if (std::isnan(time)) return nan_value(); | |
| 360 time_t tv = static_cast<time_t>(std::floor(time/msPerSecond)); | |
| 361 struct tm* t = localtime(&tv); | |
| 362 if (NULL == t) return nan_value(); | |
| 363 return t->tm_isdst > 0 ? 3600 * msPerSecond : 0; | |
| 364 } | |
| 365 | |
| 366 | |
| 367 int OS::GetLastError() { | |
| 368 return errno; | |
| 369 } | |
| 370 | |
| 371 | |
| 372 // ---------------------------------------------------------------------------- | |
| 373 // POSIX stdio support. | |
| 374 // | |
| 375 | |
| 376 FILE* OS::FOpen(const char* path, const char* mode) { | |
| 377 FILE* file = fopen(path, mode); | |
| 378 if (file == NULL) return NULL; | |
| 379 struct stat file_stat; | |
| 380 if (fstat(fileno(file), &file_stat) != 0) return NULL; | |
| 381 bool is_regular_file = ((file_stat.st_mode & S_IFREG) != 0); | |
| 382 if (is_regular_file) return file; | |
| 383 fclose(file); | |
| 384 return NULL; | |
| 385 } | |
| 386 | |
| 387 | |
| 388 bool OS::Remove(const char* path) { | |
| 389 return (remove(path) == 0); | |
| 390 } | |
| 391 | |
| 392 | |
| 393 FILE* OS::OpenTemporaryFile() { | |
| 394 return tmpfile(); | |
| 395 } | |
| 396 | |
| 397 | |
| 398 const char* const OS::LogFileOpenMode = "w"; | |
| 399 | |
| 400 | |
| 401 void OS::Print(const char* format, ...) { | |
| 402 va_list args; | |
| 403 va_start(args, format); | |
| 404 VPrint(format, args); | |
| 405 va_end(args); | |
| 406 } | |
| 407 | |
| 408 | |
| 409 void OS::VPrint(const char* format, va_list args) { | |
| 410 #if defined(ANDROID) && !defined(V8_ANDROID_LOG_STDOUT) | |
| 411 __android_log_vprint(ANDROID_LOG_INFO, LOG_TAG, format, args); | |
| 412 #else | |
| 413 vprintf(format, args); | |
| 414 #endif | |
| 415 } | |
| 416 | |
| 417 | |
| 418 void OS::FPrint(FILE* out, const char* format, ...) { | |
| 419 va_list args; | |
| 420 va_start(args, format); | |
| 421 VFPrint(out, format, args); | |
| 422 va_end(args); | |
| 423 } | |
| 424 | |
| 425 | |
| 426 void OS::VFPrint(FILE* out, const char* format, va_list args) { | |
| 427 #if defined(ANDROID) && !defined(V8_ANDROID_LOG_STDOUT) | |
| 428 __android_log_vprint(ANDROID_LOG_INFO, LOG_TAG, format, args); | |
| 429 #else | |
| 430 vfprintf(out, format, args); | |
| 431 #endif | |
| 432 } | |
| 433 | |
| 434 | |
| 435 void OS::PrintError(const char* format, ...) { | |
| 436 va_list args; | |
| 437 va_start(args, format); | |
| 438 VPrintError(format, args); | |
| 439 va_end(args); | |
| 440 } | |
| 441 | |
| 442 | |
| 443 void OS::VPrintError(const char* format, va_list args) { | |
| 444 #if defined(ANDROID) && !defined(V8_ANDROID_LOG_STDOUT) | |
| 445 __android_log_vprint(ANDROID_LOG_ERROR, LOG_TAG, format, args); | |
| 446 #else | |
| 447 vfprintf(stderr, format, args); | |
| 448 #endif | |
| 449 } | |
| 450 | |
| 451 | |
| 452 int OS::SNPrintF(char* str, int length, const char* format, ...) { | |
| 453 va_list args; | |
| 454 va_start(args, format); | |
| 455 int result = VSNPrintF(str, length, format, args); | |
| 456 va_end(args); | |
| 457 return result; | |
| 458 } | |
| 459 | |
| 460 | |
| 461 int OS::VSNPrintF(char* str, | |
| 462 int length, | |
| 463 const char* format, | |
| 464 va_list args) { | |
| 465 int n = vsnprintf(str, length, format, args); | |
| 466 if (n < 0 || n >= length) { | |
| 467 // If the length is zero, the assignment fails. | |
| 468 if (length > 0) | |
| 469 str[length - 1] = '\0'; | |
| 470 return -1; | |
| 471 } else { | |
| 472 return n; | |
| 473 } | |
| 474 } | |
| 475 | |
| 476 | |
| 477 // ---------------------------------------------------------------------------- | |
| 478 // POSIX string support. | |
| 479 // | |
| 480 | |
| 481 char* OS::StrChr(char* str, int c) { | |
| 482 return strchr(str, c); | |
| 483 } | |
| 484 | |
| 485 | |
| 486 void OS::StrNCpy(char* dest, int length, const char* src, size_t n) { | |
| 487 strncpy(dest, src, n); | |
| 488 } | |
| 489 | |
| 490 | |
| 491 // ---------------------------------------------------------------------------- | |
| 492 // POSIX thread support. | |
| 493 // | |
| 494 | |
| 495 class Thread::PlatformData { | |
| 496 public: | |
| 497 PlatformData() : thread_(kNoThread) {} | |
| 498 pthread_t thread_; // Thread handle for pthread. | |
| 499 // Synchronizes thread creation | |
| 500 Mutex thread_creation_mutex_; | |
| 501 }; | |
| 502 | |
| 503 Thread::Thread(const Options& options) | |
| 504 : data_(new PlatformData), | |
| 505 stack_size_(options.stack_size()), | |
| 506 start_semaphore_(NULL) { | |
| 507 if (stack_size_ > 0 && stack_size_ < PTHREAD_STACK_MIN) { | |
| 508 stack_size_ = PTHREAD_STACK_MIN; | |
| 509 } | |
| 510 set_name(options.name()); | |
| 511 } | |
| 512 | |
| 513 | |
| 514 Thread::~Thread() { | |
| 515 delete data_; | |
| 516 } | |
| 517 | |
| 518 | |
| 519 static void SetThreadName(const char* name) { | |
| 520 #if V8_OS_DRAGONFLYBSD || V8_OS_FREEBSD || V8_OS_OPENBSD | |
| 521 pthread_set_name_np(pthread_self(), name); | |
| 522 #elif V8_OS_NETBSD | |
| 523 STATIC_ASSERT(Thread::kMaxThreadNameLength <= PTHREAD_MAX_NAMELEN_NP); | |
| 524 pthread_setname_np(pthread_self(), "%s", name); | |
| 525 #elif V8_OS_MACOSX | |
| 526 // pthread_setname_np is only available in 10.6 or later, so test | |
| 527 // for it at runtime. | |
| 528 int (*dynamic_pthread_setname_np)(const char*); | |
| 529 *reinterpret_cast<void**>(&dynamic_pthread_setname_np) = | |
| 530 dlsym(RTLD_DEFAULT, "pthread_setname_np"); | |
| 531 if (dynamic_pthread_setname_np == NULL) | |
| 532 return; | |
| 533 | |
| 534 // Mac OS X does not expose the length limit of the name, so hardcode it. | |
| 535 static const int kMaxNameLength = 63; | |
| 536 STATIC_ASSERT(Thread::kMaxThreadNameLength <= kMaxNameLength); | |
| 537 dynamic_pthread_setname_np(name); | |
| 538 #elif defined(PR_SET_NAME) | |
| 539 prctl(PR_SET_NAME, | |
| 540 reinterpret_cast<unsigned long>(name), // NOLINT | |
| 541 0, 0, 0); | |
| 542 #endif | |
| 543 } | |
| 544 | |
| 545 | |
| 546 static void* ThreadEntry(void* arg) { | |
| 547 Thread* thread = reinterpret_cast<Thread*>(arg); | |
| 548 // We take the lock here to make sure that pthread_create finished first since | |
| 549 // we don't know which thread will run first (the original thread or the new | |
| 550 // one). | |
| 551 { LockGuard<Mutex> lock_guard(&thread->data()->thread_creation_mutex_); } | |
| 552 SetThreadName(thread->name()); | |
| 553 ASSERT(thread->data()->thread_ != kNoThread); | |
| 554 thread->NotifyStartedAndRun(); | |
| 555 return NULL; | |
| 556 } | |
| 557 | |
| 558 | |
| 559 void Thread::set_name(const char* name) { | |
| 560 strncpy(name_, name, sizeof(name_)); | |
| 561 name_[sizeof(name_) - 1] = '\0'; | |
| 562 } | |
| 563 | |
| 564 | |
| 565 void Thread::Start() { | |
| 566 int result; | |
| 567 pthread_attr_t attr; | |
| 568 memset(&attr, 0, sizeof(attr)); | |
| 569 result = pthread_attr_init(&attr); | |
| 570 ASSERT_EQ(0, result); | |
| 571 // Native client uses default stack size. | |
| 572 #if !V8_OS_NACL | |
| 573 if (stack_size_ > 0) { | |
| 574 result = pthread_attr_setstacksize(&attr, static_cast<size_t>(stack_size_)); | |
| 575 ASSERT_EQ(0, result); | |
| 576 } | |
| 577 #endif | |
| 578 { | |
| 579 LockGuard<Mutex> lock_guard(&data_->thread_creation_mutex_); | |
| 580 result = pthread_create(&data_->thread_, &attr, ThreadEntry, this); | |
| 581 } | |
| 582 ASSERT_EQ(0, result); | |
| 583 result = pthread_attr_destroy(&attr); | |
| 584 ASSERT_EQ(0, result); | |
| 585 ASSERT(data_->thread_ != kNoThread); | |
| 586 USE(result); | |
| 587 } | |
| 588 | |
| 589 | |
| 590 void Thread::Join() { | |
| 591 pthread_join(data_->thread_, NULL); | |
| 592 } | |
| 593 | |
| 594 | |
| 595 void Thread::YieldCPU() { | |
| 596 int result = sched_yield(); | |
| 597 ASSERT_EQ(0, result); | |
| 598 USE(result); | |
| 599 } | |
| 600 | |
| 601 | |
| 602 static Thread::LocalStorageKey PthreadKeyToLocalKey(pthread_key_t pthread_key) { | |
| 603 #if V8_OS_CYGWIN | |
| 604 // We need to cast pthread_key_t to Thread::LocalStorageKey in two steps | |
| 605 // because pthread_key_t is a pointer type on Cygwin. This will probably not | |
| 606 // work on 64-bit platforms, but Cygwin doesn't support 64-bit anyway. | |
| 607 STATIC_ASSERT(sizeof(Thread::LocalStorageKey) == sizeof(pthread_key_t)); | |
| 608 intptr_t ptr_key = reinterpret_cast<intptr_t>(pthread_key); | |
| 609 return static_cast<Thread::LocalStorageKey>(ptr_key); | |
| 610 #else | |
| 611 return static_cast<Thread::LocalStorageKey>(pthread_key); | |
| 612 #endif | |
| 613 } | |
| 614 | |
| 615 | |
| 616 static pthread_key_t LocalKeyToPthreadKey(Thread::LocalStorageKey local_key) { | |
| 617 #if V8_OS_CYGWIN | |
| 618 STATIC_ASSERT(sizeof(Thread::LocalStorageKey) == sizeof(pthread_key_t)); | |
| 619 intptr_t ptr_key = static_cast<intptr_t>(local_key); | |
| 620 return reinterpret_cast<pthread_key_t>(ptr_key); | |
| 621 #else | |
| 622 return static_cast<pthread_key_t>(local_key); | |
| 623 #endif | |
| 624 } | |
| 625 | |
| 626 | |
| 627 #ifdef V8_FAST_TLS_SUPPORTED | |
| 628 | |
| 629 static base::Atomic32 tls_base_offset_initialized = 0; | |
| 630 intptr_t kMacTlsBaseOffset = 0; | |
| 631 | |
| 632 // It's safe to do the initialization more that once, but it has to be | |
| 633 // done at least once. | |
| 634 static void InitializeTlsBaseOffset() { | |
| 635 const size_t kBufferSize = 128; | |
| 636 char buffer[kBufferSize]; | |
| 637 size_t buffer_size = kBufferSize; | |
| 638 int ctl_name[] = { CTL_KERN , KERN_OSRELEASE }; | |
| 639 if (sysctl(ctl_name, 2, buffer, &buffer_size, NULL, 0) != 0) { | |
| 640 V8_Fatal(__FILE__, __LINE__, "V8 failed to get kernel version"); | |
| 641 } | |
| 642 // The buffer now contains a string of the form XX.YY.ZZ, where | |
| 643 // XX is the major kernel version component. | |
| 644 // Make sure the buffer is 0-terminated. | |
| 645 buffer[kBufferSize - 1] = '\0'; | |
| 646 char* period_pos = strchr(buffer, '.'); | |
| 647 *period_pos = '\0'; | |
| 648 int kernel_version_major = | |
| 649 static_cast<int>(strtol(buffer, NULL, 10)); // NOLINT | |
| 650 // The constants below are taken from pthreads.s from the XNU kernel | |
| 651 // sources archive at www.opensource.apple.com. | |
| 652 if (kernel_version_major < 11) { | |
| 653 // 8.x.x (Tiger), 9.x.x (Leopard), 10.x.x (Snow Leopard) have the | |
| 654 // same offsets. | |
| 655 #if V8_HOST_ARCH_IA32 | |
| 656 kMacTlsBaseOffset = 0x48; | |
| 657 #else | |
| 658 kMacTlsBaseOffset = 0x60; | |
| 659 #endif | |
| 660 } else { | |
| 661 // 11.x.x (Lion) changed the offset. | |
| 662 kMacTlsBaseOffset = 0; | |
| 663 } | |
| 664 | |
| 665 base::Release_Store(&tls_base_offset_initialized, 1); | |
| 666 } | |
| 667 | |
| 668 | |
| 669 static void CheckFastTls(Thread::LocalStorageKey key) { | |
| 670 void* expected = reinterpret_cast<void*>(0x1234CAFE); | |
| 671 Thread::SetThreadLocal(key, expected); | |
| 672 void* actual = Thread::GetExistingThreadLocal(key); | |
| 673 if (expected != actual) { | |
| 674 V8_Fatal(__FILE__, __LINE__, | |
| 675 "V8 failed to initialize fast TLS on current kernel"); | |
| 676 } | |
| 677 Thread::SetThreadLocal(key, NULL); | |
| 678 } | |
| 679 | |
| 680 #endif // V8_FAST_TLS_SUPPORTED | |
| 681 | |
| 682 | |
| 683 Thread::LocalStorageKey Thread::CreateThreadLocalKey() { | |
| 684 #ifdef V8_FAST_TLS_SUPPORTED | |
| 685 bool check_fast_tls = false; | |
| 686 if (tls_base_offset_initialized == 0) { | |
| 687 check_fast_tls = true; | |
| 688 InitializeTlsBaseOffset(); | |
| 689 } | |
| 690 #endif | |
| 691 pthread_key_t key; | |
| 692 int result = pthread_key_create(&key, NULL); | |
| 693 ASSERT_EQ(0, result); | |
| 694 USE(result); | |
| 695 LocalStorageKey local_key = PthreadKeyToLocalKey(key); | |
| 696 #ifdef V8_FAST_TLS_SUPPORTED | |
| 697 // If we just initialized fast TLS support, make sure it works. | |
| 698 if (check_fast_tls) CheckFastTls(local_key); | |
| 699 #endif | |
| 700 return local_key; | |
| 701 } | |
| 702 | |
| 703 | |
| 704 void Thread::DeleteThreadLocalKey(LocalStorageKey key) { | |
| 705 pthread_key_t pthread_key = LocalKeyToPthreadKey(key); | |
| 706 int result = pthread_key_delete(pthread_key); | |
| 707 ASSERT_EQ(0, result); | |
| 708 USE(result); | |
| 709 } | |
| 710 | |
| 711 | |
| 712 void* Thread::GetThreadLocal(LocalStorageKey key) { | |
| 713 pthread_key_t pthread_key = LocalKeyToPthreadKey(key); | |
| 714 return pthread_getspecific(pthread_key); | |
| 715 } | |
| 716 | |
| 717 | |
| 718 void Thread::SetThreadLocal(LocalStorageKey key, void* value) { | |
| 719 pthread_key_t pthread_key = LocalKeyToPthreadKey(key); | |
| 720 int result = pthread_setspecific(pthread_key, value); | |
| 721 ASSERT_EQ(0, result); | |
| 722 USE(result); | |
| 723 } | |
| 724 | |
| 725 | |
| 726 } } // namespace v8::internal | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 358363002:
Move platform abstraction to base library (Closed)
Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge