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| 1 // Copyright 2013 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 #include "src/platform/time.h" | |
| 6 | |
| 7 #if V8_OS_POSIX | |
| 8 #include <sys/time.h> | |
| 9 #endif | |
| 10 #if V8_OS_MACOSX | |
| 11 #include <mach/mach_time.h> | |
| 12 #endif | |
| 13 | |
| 14 #include <string.h> | |
| 15 | |
| 16 #if V8_OS_WIN | |
| 17 #include "src/base/lazy-instance.h" | |
| 18 #include "src/base/win32-headers.h" | |
| 19 #endif | |
| 20 #include "src/checks.h" | |
| 21 #include "src/cpu.h" | |
| 22 #include "src/platform.h" | |
| 23 | |
| 24 namespace v8 { | |
| 25 namespace internal { | |
| 26 | |
| 27 TimeDelta TimeDelta::FromDays(int days) { | |
| 28 return TimeDelta(days * Time::kMicrosecondsPerDay); | |
| 29 } | |
| 30 | |
| 31 | |
| 32 TimeDelta TimeDelta::FromHours(int hours) { | |
| 33 return TimeDelta(hours * Time::kMicrosecondsPerHour); | |
| 34 } | |
| 35 | |
| 36 | |
| 37 TimeDelta TimeDelta::FromMinutes(int minutes) { | |
| 38 return TimeDelta(minutes * Time::kMicrosecondsPerMinute); | |
| 39 } | |
| 40 | |
| 41 | |
| 42 TimeDelta TimeDelta::FromSeconds(int64_t seconds) { | |
| 43 return TimeDelta(seconds * Time::kMicrosecondsPerSecond); | |
| 44 } | |
| 45 | |
| 46 | |
| 47 TimeDelta TimeDelta::FromMilliseconds(int64_t milliseconds) { | |
| 48 return TimeDelta(milliseconds * Time::kMicrosecondsPerMillisecond); | |
| 49 } | |
| 50 | |
| 51 | |
| 52 TimeDelta TimeDelta::FromNanoseconds(int64_t nanoseconds) { | |
| 53 return TimeDelta(nanoseconds / Time::kNanosecondsPerMicrosecond); | |
| 54 } | |
| 55 | |
| 56 | |
| 57 int TimeDelta::InDays() const { | |
| 58 return static_cast<int>(delta_ / Time::kMicrosecondsPerDay); | |
| 59 } | |
| 60 | |
| 61 | |
| 62 int TimeDelta::InHours() const { | |
| 63 return static_cast<int>(delta_ / Time::kMicrosecondsPerHour); | |
| 64 } | |
| 65 | |
| 66 | |
| 67 int TimeDelta::InMinutes() const { | |
| 68 return static_cast<int>(delta_ / Time::kMicrosecondsPerMinute); | |
| 69 } | |
| 70 | |
| 71 | |
| 72 double TimeDelta::InSecondsF() const { | |
| 73 return static_cast<double>(delta_) / Time::kMicrosecondsPerSecond; | |
| 74 } | |
| 75 | |
| 76 | |
| 77 int64_t TimeDelta::InSeconds() const { | |
| 78 return delta_ / Time::kMicrosecondsPerSecond; | |
| 79 } | |
| 80 | |
| 81 | |
| 82 double TimeDelta::InMillisecondsF() const { | |
| 83 return static_cast<double>(delta_) / Time::kMicrosecondsPerMillisecond; | |
| 84 } | |
| 85 | |
| 86 | |
| 87 int64_t TimeDelta::InMilliseconds() const { | |
| 88 return delta_ / Time::kMicrosecondsPerMillisecond; | |
| 89 } | |
| 90 | |
| 91 | |
| 92 int64_t TimeDelta::InNanoseconds() const { | |
| 93 return delta_ * Time::kNanosecondsPerMicrosecond; | |
| 94 } | |
| 95 | |
| 96 | |
| 97 #if V8_OS_MACOSX | |
| 98 | |
| 99 TimeDelta TimeDelta::FromMachTimespec(struct mach_timespec ts) { | |
| 100 ASSERT_GE(ts.tv_nsec, 0); | |
| 101 ASSERT_LT(ts.tv_nsec, | |
| 102 static_cast<long>(Time::kNanosecondsPerSecond)); // NOLINT | |
| 103 return TimeDelta(ts.tv_sec * Time::kMicrosecondsPerSecond + | |
| 104 ts.tv_nsec / Time::kNanosecondsPerMicrosecond); | |
| 105 } | |
| 106 | |
| 107 | |
| 108 struct mach_timespec TimeDelta::ToMachTimespec() const { | |
| 109 struct mach_timespec ts; | |
| 110 ASSERT(delta_ >= 0); | |
| 111 ts.tv_sec = delta_ / Time::kMicrosecondsPerSecond; | |
| 112 ts.tv_nsec = (delta_ % Time::kMicrosecondsPerSecond) * | |
| 113 Time::kNanosecondsPerMicrosecond; | |
| 114 return ts; | |
| 115 } | |
| 116 | |
| 117 #endif // V8_OS_MACOSX | |
| 118 | |
| 119 | |
| 120 #if V8_OS_POSIX | |
| 121 | |
| 122 TimeDelta TimeDelta::FromTimespec(struct timespec ts) { | |
| 123 ASSERT_GE(ts.tv_nsec, 0); | |
| 124 ASSERT_LT(ts.tv_nsec, | |
| 125 static_cast<long>(Time::kNanosecondsPerSecond)); // NOLINT | |
| 126 return TimeDelta(ts.tv_sec * Time::kMicrosecondsPerSecond + | |
| 127 ts.tv_nsec / Time::kNanosecondsPerMicrosecond); | |
| 128 } | |
| 129 | |
| 130 | |
| 131 struct timespec TimeDelta::ToTimespec() const { | |
| 132 struct timespec ts; | |
| 133 ts.tv_sec = delta_ / Time::kMicrosecondsPerSecond; | |
| 134 ts.tv_nsec = (delta_ % Time::kMicrosecondsPerSecond) * | |
| 135 Time::kNanosecondsPerMicrosecond; | |
| 136 return ts; | |
| 137 } | |
| 138 | |
| 139 #endif // V8_OS_POSIX | |
| 140 | |
| 141 | |
| 142 #if V8_OS_WIN | |
| 143 | |
| 144 // We implement time using the high-resolution timers so that we can get | |
| 145 // timeouts which are smaller than 10-15ms. To avoid any drift, we | |
| 146 // periodically resync the internal clock to the system clock. | |
| 147 class Clock V8_FINAL { | |
| 148 public: | |
| 149 Clock() : initial_ticks_(GetSystemTicks()), initial_time_(GetSystemTime()) {} | |
| 150 | |
| 151 Time Now() { | |
| 152 // Time between resampling the un-granular clock for this API (1 minute). | |
| 153 const TimeDelta kMaxElapsedTime = TimeDelta::FromMinutes(1); | |
| 154 | |
| 155 LockGuard<Mutex> lock_guard(&mutex_); | |
| 156 | |
| 157 // Determine current time and ticks. | |
| 158 TimeTicks ticks = GetSystemTicks(); | |
| 159 Time time = GetSystemTime(); | |
| 160 | |
| 161 // Check if we need to synchronize with the system clock due to a backwards | |
| 162 // time change or the amount of time elapsed. | |
| 163 TimeDelta elapsed = ticks - initial_ticks_; | |
| 164 if (time < initial_time_ || elapsed > kMaxElapsedTime) { | |
| 165 initial_ticks_ = ticks; | |
| 166 initial_time_ = time; | |
| 167 return time; | |
| 168 } | |
| 169 | |
| 170 return initial_time_ + elapsed; | |
| 171 } | |
| 172 | |
| 173 Time NowFromSystemTime() { | |
| 174 LockGuard<Mutex> lock_guard(&mutex_); | |
| 175 initial_ticks_ = GetSystemTicks(); | |
| 176 initial_time_ = GetSystemTime(); | |
| 177 return initial_time_; | |
| 178 } | |
| 179 | |
| 180 private: | |
| 181 static TimeTicks GetSystemTicks() { | |
| 182 return TimeTicks::Now(); | |
| 183 } | |
| 184 | |
| 185 static Time GetSystemTime() { | |
| 186 FILETIME ft; | |
| 187 ::GetSystemTimeAsFileTime(&ft); | |
| 188 return Time::FromFiletime(ft); | |
| 189 } | |
| 190 | |
| 191 TimeTicks initial_ticks_; | |
| 192 Time initial_time_; | |
| 193 Mutex mutex_; | |
| 194 }; | |
| 195 | |
| 196 | |
| 197 static base::LazyStaticInstance<Clock, base::DefaultConstructTrait<Clock>, | |
| 198 base::ThreadSafeInitOnceTrait>::type clock = | |
| 199 LAZY_STATIC_INSTANCE_INITIALIZER; | |
| 200 | |
| 201 | |
| 202 Time Time::Now() { | |
| 203 return clock.Pointer()->Now(); | |
| 204 } | |
| 205 | |
| 206 | |
| 207 Time Time::NowFromSystemTime() { | |
| 208 return clock.Pointer()->NowFromSystemTime(); | |
| 209 } | |
| 210 | |
| 211 | |
| 212 // Time between windows epoch and standard epoch. | |
| 213 static const int64_t kTimeToEpochInMicroseconds = V8_INT64_C(11644473600000000); | |
| 214 | |
| 215 | |
| 216 Time Time::FromFiletime(FILETIME ft) { | |
| 217 if (ft.dwLowDateTime == 0 && ft.dwHighDateTime == 0) { | |
| 218 return Time(); | |
| 219 } | |
| 220 if (ft.dwLowDateTime == std::numeric_limits<DWORD>::max() && | |
| 221 ft.dwHighDateTime == std::numeric_limits<DWORD>::max()) { | |
| 222 return Max(); | |
| 223 } | |
| 224 int64_t us = (static_cast<uint64_t>(ft.dwLowDateTime) + | |
| 225 (static_cast<uint64_t>(ft.dwHighDateTime) << 32)) / 10; | |
| 226 return Time(us - kTimeToEpochInMicroseconds); | |
| 227 } | |
| 228 | |
| 229 | |
| 230 FILETIME Time::ToFiletime() const { | |
| 231 ASSERT(us_ >= 0); | |
| 232 FILETIME ft; | |
| 233 if (IsNull()) { | |
| 234 ft.dwLowDateTime = 0; | |
| 235 ft.dwHighDateTime = 0; | |
| 236 return ft; | |
| 237 } | |
| 238 if (IsMax()) { | |
| 239 ft.dwLowDateTime = std::numeric_limits<DWORD>::max(); | |
| 240 ft.dwHighDateTime = std::numeric_limits<DWORD>::max(); | |
| 241 return ft; | |
| 242 } | |
| 243 uint64_t us = static_cast<uint64_t>(us_ + kTimeToEpochInMicroseconds) * 10; | |
| 244 ft.dwLowDateTime = static_cast<DWORD>(us); | |
| 245 ft.dwHighDateTime = static_cast<DWORD>(us >> 32); | |
| 246 return ft; | |
| 247 } | |
| 248 | |
| 249 #elif V8_OS_POSIX | |
| 250 | |
| 251 Time Time::Now() { | |
| 252 struct timeval tv; | |
| 253 int result = gettimeofday(&tv, NULL); | |
| 254 ASSERT_EQ(0, result); | |
| 255 USE(result); | |
| 256 return FromTimeval(tv); | |
| 257 } | |
| 258 | |
| 259 | |
| 260 Time Time::NowFromSystemTime() { | |
| 261 return Now(); | |
| 262 } | |
| 263 | |
| 264 | |
| 265 Time Time::FromTimespec(struct timespec ts) { | |
| 266 ASSERT(ts.tv_nsec >= 0); | |
| 267 ASSERT(ts.tv_nsec < static_cast<long>(kNanosecondsPerSecond)); // NOLINT | |
| 268 if (ts.tv_nsec == 0 && ts.tv_sec == 0) { | |
| 269 return Time(); | |
| 270 } | |
| 271 if (ts.tv_nsec == static_cast<long>(kNanosecondsPerSecond - 1) && // NOLINT | |
| 272 ts.tv_sec == std::numeric_limits<time_t>::max()) { | |
| 273 return Max(); | |
| 274 } | |
| 275 return Time(ts.tv_sec * kMicrosecondsPerSecond + | |
| 276 ts.tv_nsec / kNanosecondsPerMicrosecond); | |
| 277 } | |
| 278 | |
| 279 | |
| 280 struct timespec Time::ToTimespec() const { | |
| 281 struct timespec ts; | |
| 282 if (IsNull()) { | |
| 283 ts.tv_sec = 0; | |
| 284 ts.tv_nsec = 0; | |
| 285 return ts; | |
| 286 } | |
| 287 if (IsMax()) { | |
| 288 ts.tv_sec = std::numeric_limits<time_t>::max(); | |
| 289 ts.tv_nsec = static_cast<long>(kNanosecondsPerSecond - 1); // NOLINT | |
| 290 return ts; | |
| 291 } | |
| 292 ts.tv_sec = us_ / kMicrosecondsPerSecond; | |
| 293 ts.tv_nsec = (us_ % kMicrosecondsPerSecond) * kNanosecondsPerMicrosecond; | |
| 294 return ts; | |
| 295 } | |
| 296 | |
| 297 | |
| 298 Time Time::FromTimeval(struct timeval tv) { | |
| 299 ASSERT(tv.tv_usec >= 0); | |
| 300 ASSERT(tv.tv_usec < static_cast<suseconds_t>(kMicrosecondsPerSecond)); | |
| 301 if (tv.tv_usec == 0 && tv.tv_sec == 0) { | |
| 302 return Time(); | |
| 303 } | |
| 304 if (tv.tv_usec == static_cast<suseconds_t>(kMicrosecondsPerSecond - 1) && | |
| 305 tv.tv_sec == std::numeric_limits<time_t>::max()) { | |
| 306 return Max(); | |
| 307 } | |
| 308 return Time(tv.tv_sec * kMicrosecondsPerSecond + tv.tv_usec); | |
| 309 } | |
| 310 | |
| 311 | |
| 312 struct timeval Time::ToTimeval() const { | |
| 313 struct timeval tv; | |
| 314 if (IsNull()) { | |
| 315 tv.tv_sec = 0; | |
| 316 tv.tv_usec = 0; | |
| 317 return tv; | |
| 318 } | |
| 319 if (IsMax()) { | |
| 320 tv.tv_sec = std::numeric_limits<time_t>::max(); | |
| 321 tv.tv_usec = static_cast<suseconds_t>(kMicrosecondsPerSecond - 1); | |
| 322 return tv; | |
| 323 } | |
| 324 tv.tv_sec = us_ / kMicrosecondsPerSecond; | |
| 325 tv.tv_usec = us_ % kMicrosecondsPerSecond; | |
| 326 return tv; | |
| 327 } | |
| 328 | |
| 329 #endif // V8_OS_WIN | |
| 330 | |
| 331 | |
| 332 Time Time::FromJsTime(double ms_since_epoch) { | |
| 333 // The epoch is a valid time, so this constructor doesn't interpret | |
| 334 // 0 as the null time. | |
| 335 if (ms_since_epoch == std::numeric_limits<double>::max()) { | |
| 336 return Max(); | |
| 337 } | |
| 338 return Time( | |
| 339 static_cast<int64_t>(ms_since_epoch * kMicrosecondsPerMillisecond)); | |
| 340 } | |
| 341 | |
| 342 | |
| 343 double Time::ToJsTime() const { | |
| 344 if (IsNull()) { | |
| 345 // Preserve 0 so the invalid result doesn't depend on the platform. | |
| 346 return 0; | |
| 347 } | |
| 348 if (IsMax()) { | |
| 349 // Preserve max without offset to prevent overflow. | |
| 350 return std::numeric_limits<double>::max(); | |
| 351 } | |
| 352 return static_cast<double>(us_) / kMicrosecondsPerMillisecond; | |
| 353 } | |
| 354 | |
| 355 | |
| 356 #if V8_OS_WIN | |
| 357 | |
| 358 class TickClock { | |
| 359 public: | |
| 360 virtual ~TickClock() {} | |
| 361 virtual int64_t Now() = 0; | |
| 362 virtual bool IsHighResolution() = 0; | |
| 363 }; | |
| 364 | |
| 365 | |
| 366 // Overview of time counters: | |
| 367 // (1) CPU cycle counter. (Retrieved via RDTSC) | |
| 368 // The CPU counter provides the highest resolution time stamp and is the least | |
| 369 // expensive to retrieve. However, the CPU counter is unreliable and should not | |
| 370 // be used in production. Its biggest issue is that it is per processor and it | |
| 371 // is not synchronized between processors. Also, on some computers, the counters | |
| 372 // will change frequency due to thermal and power changes, and stop in some | |
| 373 // states. | |
| 374 // | |
| 375 // (2) QueryPerformanceCounter (QPC). The QPC counter provides a high- | |
| 376 // resolution (100 nanoseconds) time stamp but is comparatively more expensive | |
| 377 // to retrieve. What QueryPerformanceCounter actually does is up to the HAL. | |
| 378 // (with some help from ACPI). | |
| 379 // According to http://blogs.msdn.com/oldnewthing/archive/2005/09/02/459952.aspx | |
| 380 // in the worst case, it gets the counter from the rollover interrupt on the | |
| 381 // programmable interrupt timer. In best cases, the HAL may conclude that the | |
| 382 // RDTSC counter runs at a constant frequency, then it uses that instead. On | |
| 383 // multiprocessor machines, it will try to verify the values returned from | |
| 384 // RDTSC on each processor are consistent with each other, and apply a handful | |
| 385 // of workarounds for known buggy hardware. In other words, QPC is supposed to | |
| 386 // give consistent result on a multiprocessor computer, but it is unreliable in | |
| 387 // reality due to bugs in BIOS or HAL on some, especially old computers. | |
| 388 // With recent updates on HAL and newer BIOS, QPC is getting more reliable but | |
| 389 // it should be used with caution. | |
| 390 // | |
| 391 // (3) System time. The system time provides a low-resolution (typically 10ms | |
| 392 // to 55 milliseconds) time stamp but is comparatively less expensive to | |
| 393 // retrieve and more reliable. | |
| 394 class HighResolutionTickClock V8_FINAL : public TickClock { | |
| 395 public: | |
| 396 explicit HighResolutionTickClock(int64_t ticks_per_second) | |
| 397 : ticks_per_second_(ticks_per_second) { | |
| 398 ASSERT_LT(0, ticks_per_second); | |
| 399 } | |
| 400 virtual ~HighResolutionTickClock() {} | |
| 401 | |
| 402 virtual int64_t Now() V8_OVERRIDE { | |
| 403 LARGE_INTEGER now; | |
| 404 BOOL result = QueryPerformanceCounter(&now); | |
| 405 ASSERT(result); | |
| 406 USE(result); | |
| 407 | |
| 408 // Intentionally calculate microseconds in a round about manner to avoid | |
| 409 // overflow and precision issues. Think twice before simplifying! | |
| 410 int64_t whole_seconds = now.QuadPart / ticks_per_second_; | |
| 411 int64_t leftover_ticks = now.QuadPart % ticks_per_second_; | |
| 412 int64_t ticks = (whole_seconds * Time::kMicrosecondsPerSecond) + | |
| 413 ((leftover_ticks * Time::kMicrosecondsPerSecond) / ticks_per_second_); | |
| 414 | |
| 415 // Make sure we never return 0 here, so that TimeTicks::HighResolutionNow() | |
| 416 // will never return 0. | |
| 417 return ticks + 1; | |
| 418 } | |
| 419 | |
| 420 virtual bool IsHighResolution() V8_OVERRIDE { | |
| 421 return true; | |
| 422 } | |
| 423 | |
| 424 private: | |
| 425 int64_t ticks_per_second_; | |
| 426 }; | |
| 427 | |
| 428 | |
| 429 class RolloverProtectedTickClock V8_FINAL : public TickClock { | |
| 430 public: | |
| 431 // We initialize rollover_ms_ to 1 to ensure that we will never | |
| 432 // return 0 from TimeTicks::HighResolutionNow() and TimeTicks::Now() below. | |
| 433 RolloverProtectedTickClock() : last_seen_now_(0), rollover_ms_(1) {} | |
| 434 virtual ~RolloverProtectedTickClock() {} | |
| 435 | |
| 436 virtual int64_t Now() V8_OVERRIDE { | |
| 437 LockGuard<Mutex> lock_guard(&mutex_); | |
| 438 // We use timeGetTime() to implement TimeTicks::Now(), which rolls over | |
| 439 // every ~49.7 days. We try to track rollover ourselves, which works if | |
| 440 // TimeTicks::Now() is called at least every 49 days. | |
| 441 // Note that we do not use GetTickCount() here, since timeGetTime() gives | |
| 442 // more predictable delta values, as described here: | |
| 443 // http://blogs.msdn.com/b/larryosterman/archive/2009/09/02/what-s-the-diffe
rence-between-gettickcount-and-timegettime.aspx | |
| 444 // timeGetTime() provides 1ms granularity when combined with | |
| 445 // timeBeginPeriod(). If the host application for V8 wants fast timers, it | |
| 446 // can use timeBeginPeriod() to increase the resolution. | |
| 447 DWORD now = timeGetTime(); | |
| 448 if (now < last_seen_now_) { | |
| 449 rollover_ms_ += V8_INT64_C(0x100000000); // ~49.7 days. | |
| 450 } | |
| 451 last_seen_now_ = now; | |
| 452 return (now + rollover_ms_) * Time::kMicrosecondsPerMillisecond; | |
| 453 } | |
| 454 | |
| 455 virtual bool IsHighResolution() V8_OVERRIDE { | |
| 456 return false; | |
| 457 } | |
| 458 | |
| 459 private: | |
| 460 Mutex mutex_; | |
| 461 DWORD last_seen_now_; | |
| 462 int64_t rollover_ms_; | |
| 463 }; | |
| 464 | |
| 465 | |
| 466 static base::LazyStaticInstance< | |
| 467 RolloverProtectedTickClock, | |
| 468 base::DefaultConstructTrait<RolloverProtectedTickClock>, | |
| 469 base::ThreadSafeInitOnceTrait>::type tick_clock = | |
| 470 LAZY_STATIC_INSTANCE_INITIALIZER; | |
| 471 | |
| 472 | |
| 473 struct CreateHighResTickClockTrait { | |
| 474 static TickClock* Create() { | |
| 475 // Check if the installed hardware supports a high-resolution performance | |
| 476 // counter, and if not fallback to the low-resolution tick clock. | |
| 477 LARGE_INTEGER ticks_per_second; | |
| 478 if (!QueryPerformanceFrequency(&ticks_per_second)) { | |
| 479 return tick_clock.Pointer(); | |
| 480 } | |
| 481 | |
| 482 // On Athlon X2 CPUs (e.g. model 15) the QueryPerformanceCounter | |
| 483 // is unreliable, fallback to the low-resolution tick clock. | |
| 484 CPU cpu; | |
| 485 if (strcmp(cpu.vendor(), "AuthenticAMD") == 0 && cpu.family() == 15) { | |
| 486 return tick_clock.Pointer(); | |
| 487 } | |
| 488 | |
| 489 return new HighResolutionTickClock(ticks_per_second.QuadPart); | |
| 490 } | |
| 491 }; | |
| 492 | |
| 493 | |
| 494 static base::LazyDynamicInstance<TickClock, | |
| 495 CreateHighResTickClockTrait, | |
| 496 base::ThreadSafeInitOnceTrait>::type high_res_tick_clock = | |
| 497 LAZY_DYNAMIC_INSTANCE_INITIALIZER; | |
| 498 | |
| 499 | |
| 500 TimeTicks TimeTicks::Now() { | |
| 501 // Make sure we never return 0 here. | |
| 502 TimeTicks ticks(tick_clock.Pointer()->Now()); | |
| 503 ASSERT(!ticks.IsNull()); | |
| 504 return ticks; | |
| 505 } | |
| 506 | |
| 507 | |
| 508 TimeTicks TimeTicks::HighResolutionNow() { | |
| 509 // Make sure we never return 0 here. | |
| 510 TimeTicks ticks(high_res_tick_clock.Pointer()->Now()); | |
| 511 ASSERT(!ticks.IsNull()); | |
| 512 return ticks; | |
| 513 } | |
| 514 | |
| 515 | |
| 516 // static | |
| 517 bool TimeTicks::IsHighResolutionClockWorking() { | |
| 518 return high_res_tick_clock.Pointer()->IsHighResolution(); | |
| 519 } | |
| 520 | |
| 521 #else // V8_OS_WIN | |
| 522 | |
| 523 TimeTicks TimeTicks::Now() { | |
| 524 return HighResolutionNow(); | |
| 525 } | |
| 526 | |
| 527 | |
| 528 TimeTicks TimeTicks::HighResolutionNow() { | |
| 529 int64_t ticks; | |
| 530 #if V8_OS_MACOSX | |
| 531 static struct mach_timebase_info info; | |
| 532 if (info.denom == 0) { | |
| 533 kern_return_t result = mach_timebase_info(&info); | |
| 534 ASSERT_EQ(KERN_SUCCESS, result); | |
| 535 USE(result); | |
| 536 } | |
| 537 ticks = (mach_absolute_time() / Time::kNanosecondsPerMicrosecond * | |
| 538 info.numer / info.denom); | |
| 539 #elif V8_OS_SOLARIS | |
| 540 ticks = (gethrtime() / Time::kNanosecondsPerMicrosecond); | |
| 541 #elif V8_LIBRT_NOT_AVAILABLE | |
| 542 // TODO(bmeurer): This is a temporary hack to support cross-compiling | |
| 543 // Chrome for Android in AOSP. Remove this once AOSP is fixed, also | |
| 544 // cleanup the tools/gyp/v8.gyp file. | |
| 545 struct timeval tv; | |
| 546 int result = gettimeofday(&tv, NULL); | |
| 547 ASSERT_EQ(0, result); | |
| 548 USE(result); | |
| 549 ticks = (tv.tv_sec * Time::kMicrosecondsPerSecond + tv.tv_usec); | |
| 550 #elif V8_OS_POSIX | |
| 551 struct timespec ts; | |
| 552 int result = clock_gettime(CLOCK_MONOTONIC, &ts); | |
| 553 ASSERT_EQ(0, result); | |
| 554 USE(result); | |
| 555 ticks = (ts.tv_sec * Time::kMicrosecondsPerSecond + | |
| 556 ts.tv_nsec / Time::kNanosecondsPerMicrosecond); | |
| 557 #endif // V8_OS_MACOSX | |
| 558 // Make sure we never return 0 here. | |
| 559 return TimeTicks(ticks + 1); | |
| 560 } | |
| 561 | |
| 562 | |
| 563 // static | |
| 564 bool TimeTicks::IsHighResolutionClockWorking() { | |
| 565 return true; | |
| 566 } | |
| 567 | |
| 568 #endif // V8_OS_WIN | |
| 569 | |
| 570 } } // namespace v8::internal | |
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Chromium Code Reviews
Issue 358363002:
Move platform abstraction to base library (Closed)
Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge