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Unified Diff: src/platform/time.cc

Issue 23710002: Revert "Cross-compiling from Linux to Android requires -lrt for the host toolset.", "Fix Visual Stu… (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 7 years, 4 months ago
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Index: src/platform/time.cc
diff --git a/src/platform/time.cc b/src/platform/time.cc
deleted file mode 100644
index a1b308a7074f8bc00e94dd46aaeed3a49d1efac5..0000000000000000000000000000000000000000
--- a/src/platform/time.cc
+++ /dev/null
@@ -1,482 +0,0 @@
-// Copyright 2013 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "platform/time.h"
-
-#if V8_OS_POSIX
-#include <sys/time.h>
-#endif
-#if V8_OS_MACOSX
-#include <mach/mach_time.h>
-#endif
-
-#include <cstring>
-
-#include "checks.h"
-#include "cpu.h"
-#include "platform.h"
-#if V8_OS_WIN
-#include "win32-headers.h"
-#endif
-
-namespace v8 {
-namespace internal {
-
-TimeDelta TimeDelta::FromDays(int days) {
- return TimeDelta(days * Time::kMicrosecondsPerDay);
-}
-
-
-TimeDelta TimeDelta::FromHours(int hours) {
- return TimeDelta(hours * Time::kMicrosecondsPerHour);
-}
-
-
-TimeDelta TimeDelta::FromMinutes(int minutes) {
- return TimeDelta(minutes * Time::kMicrosecondsPerMinute);
-}
-
-
-TimeDelta TimeDelta::FromSeconds(int64_t seconds) {
- return TimeDelta(seconds * Time::kMicrosecondsPerSecond);
-}
-
-
-TimeDelta TimeDelta::FromMilliseconds(int64_t milliseconds) {
- return TimeDelta(milliseconds * Time::kMicrosecondsPerMillisecond);
-}
-
-
-TimeDelta TimeDelta::FromNanoseconds(int64_t nanoseconds) {
- return TimeDelta(nanoseconds / Time::kNanosecondsPerMicrosecond);
-}
-
-
-int TimeDelta::InDays() const {
- return static_cast<int>(delta_ / Time::kMicrosecondsPerDay);
-}
-
-
-int TimeDelta::InHours() const {
- return static_cast<int>(delta_ / Time::kMicrosecondsPerHour);
-}
-
-
-int TimeDelta::InMinutes() const {
- return static_cast<int>(delta_ / Time::kMicrosecondsPerMinute);
-}
-
-
-double TimeDelta::InSecondsF() const {
- return static_cast<double>(delta_) / Time::kMicrosecondsPerSecond;
-}
-
-
-int64_t TimeDelta::InSeconds() const {
- return delta_ / Time::kMicrosecondsPerSecond;
-}
-
-
-double TimeDelta::InMillisecondsF() const {
- return static_cast<double>(delta_) / Time::kMicrosecondsPerMillisecond;
-}
-
-
-int64_t TimeDelta::InMilliseconds() const {
- return delta_ / Time::kMicrosecondsPerMillisecond;
-}
-
-
-int64_t TimeDelta::InNanoseconds() const {
- return delta_ * Time::kNanosecondsPerMicrosecond;
-}
-
-
-#if V8_OS_WIN
-
-// We implement time using the high-resolution timers so that we can get
-// timeouts which are smaller than 10-15ms. To avoid any drift, we
-// periodically resync the internal clock to the system clock.
-class Clock V8_FINAL {
- public:
- Clock() : initial_time_(CurrentWallclockTime()),
- initial_ticks_(TimeTicks::Now()),
- mutex_(OS::CreateMutex()) {}
-
- ~Clock() { delete mutex_; }
-
- Time Now() {
- // This must be executed under lock.
- ScopedLock sl(mutex_);
-
- // Calculate the time elapsed since we started our timer.
- TimeDelta elapsed = TimeTicks::Now() - initial_ticks_;
-
- // Check if we don't need to synchronize with the wallclock yet.
- if (elapsed.InMicroseconds() <= kMaxMicrosecondsToAvoidDrift) {
- return initial_time_ + elapsed;
- }
-
- // Resynchronize with the wallclock.
- initial_ticks_ = TimeTicks::Now();
- initial_time_ = CurrentWallclockTime();
- return initial_time_;
- }
-
- Time NowFromSystemTime() {
- ScopedLock sl(mutex_);
- initial_ticks_ = TimeTicks::Now();
- initial_time_ = CurrentWallclockTime();
- return initial_time_;
- }
-
- private:
- // Time between resampling the un-granular clock for this API (1 minute).
- static const int64_t kMaxMicrosecondsToAvoidDrift =
- Time::kMicrosecondsPerMinute;
-
- static Time CurrentWallclockTime() {
- FILETIME ft;
- ::GetSystemTimeAsFileTime(&ft);
- return Time::FromFiletime(ft);
- }
-
- TimeTicks initial_ticks_;
- Time initial_time_;
- Mutex* mutex_;
-};
-
-
-static LazyDynamicInstance<Clock,
- DefaultCreateTrait<Clock>,
- ThreadSafeInitOnceTrait>::type clock = LAZY_DYNAMIC_INSTANCE_INITIALIZER;
-
-
-Time Time::Now() {
- return clock.Pointer()->Now();
-}
-
-
-Time Time::NowFromSystemTime() {
- return clock.Pointer()->NowFromSystemTime();
-}
-
-
-// Time between windows epoch and standard epoch.
-static const int64_t kTimeToEpochInMicroseconds = V8_INT64_C(11644473600000000);
-
-
-Time Time::FromFiletime(FILETIME ft) {
- if (ft.dwLowDateTime == 0 && ft.dwHighDateTime == 0) {
- return Time();
- }
- if (ft.dwLowDateTime == std::numeric_limits<DWORD>::max() &&
- ft.dwHighDateTime == std::numeric_limits<DWORD>::max()) {
- return Max();
- }
- int64_t us = (static_cast<uint64_t>(ft.dwLowDateTime) +
- (static_cast<uint64_t>(ft.dwHighDateTime) << 32)) / 10;
- return Time(us - kTimeToEpochInMicroseconds);
-}
-
-
-FILETIME Time::ToFiletime() const {
- ASSERT(us_ >= 0);
- FILETIME ft;
- if (IsNull()) {
- ft.dwLowDateTime = 0;
- ft.dwHighDateTime = 0;
- return ft;
- }
- if (IsMax()) {
- ft.dwLowDateTime = std::numeric_limits<DWORD>::max();
- ft.dwHighDateTime = std::numeric_limits<DWORD>::max();
- return ft;
- }
- uint64_t us = static_cast<uint64_t>(us_ + kTimeToEpochInMicroseconds) * 10;
- ft.dwLowDateTime = static_cast<DWORD>(us);
- ft.dwHighDateTime = static_cast<DWORD>(us >> 32);
- return ft;
-}
-
-#elif V8_OS_POSIX
-
-Time Time::Now() {
- struct timeval tv;
- int result = gettimeofday(&tv, NULL);
- ASSERT_EQ(0, result);
- USE(result);
- return FromTimeval(tv);
-}
-
-
-Time Time::NowFromSystemTime() {
- return Now();
-}
-
-
-Time Time::FromTimeval(struct timeval tv) {
- ASSERT(tv.tv_usec >= 0);
- ASSERT(tv.tv_usec < static_cast<suseconds_t>(kMicrosecondsPerSecond));
- if (tv.tv_usec == 0 && tv.tv_sec == 0) {
- return Time();
- }
- if (tv.tv_usec == static_cast<suseconds_t>(kMicrosecondsPerSecond - 1) &&
- tv.tv_sec == std::numeric_limits<time_t>::max()) {
- return Max();
- }
- return Time(tv.tv_sec * kMicrosecondsPerSecond + tv.tv_usec);
-}
-
-
-struct timeval Time::ToTimeval() const {
- struct timeval tv;
- if (IsNull()) {
- tv.tv_sec = 0;
- tv.tv_usec = 0;
- return tv;
- }
- if (IsMax()) {
- tv.tv_sec = std::numeric_limits<time_t>::max();
- tv.tv_usec = static_cast<suseconds_t>(kMicrosecondsPerSecond - 1);
- return tv;
- }
- tv.tv_sec = us_ / kMicrosecondsPerSecond;
- tv.tv_usec = us_ % kMicrosecondsPerSecond;
- return tv;
-}
-
-#endif // V8_OS_WIN
-
-
-Time Time::FromJsTime(double ms_since_epoch) {
- // The epoch is a valid time, so this constructor doesn't interpret
- // 0 as the null time.
- if (ms_since_epoch == std::numeric_limits<double>::max()) {
- return Max();
- }
- return Time(
- static_cast<int64_t>(ms_since_epoch * kMicrosecondsPerMillisecond));
-}
-
-
-double Time::ToJsTime() const {
- if (IsNull()) {
- // Preserve 0 so the invalid result doesn't depend on the platform.
- return 0;
- }
- if (IsMax()) {
- // Preserve max without offset to prevent overflow.
- return std::numeric_limits<double>::max();
- }
- return static_cast<double>(us_) / kMicrosecondsPerMillisecond;
-}
-
-
-#if V8_OS_WIN
-
-class TickClock {
- public:
- virtual ~TickClock() {}
- virtual int64_t Now() = 0;
-};
-
-
-// Overview of time counters:
-// (1) CPU cycle counter. (Retrieved via RDTSC)
-// The CPU counter provides the highest resolution time stamp and is the least
-// expensive to retrieve. However, the CPU counter is unreliable and should not
-// be used in production. Its biggest issue is that it is per processor and it
-// is not synchronized between processors. Also, on some computers, the counters
-// will change frequency due to thermal and power changes, and stop in some
-// states.
-//
-// (2) QueryPerformanceCounter (QPC). The QPC counter provides a high-
-// resolution (100 nanoseconds) time stamp but is comparatively more expensive
-// to retrieve. What QueryPerformanceCounter actually does is up to the HAL.
-// (with some help from ACPI).
-// According to http://blogs.msdn.com/oldnewthing/archive/2005/09/02/459952.aspx
-// in the worst case, it gets the counter from the rollover interrupt on the
-// programmable interrupt timer. In best cases, the HAL may conclude that the
-// RDTSC counter runs at a constant frequency, then it uses that instead. On
-// multiprocessor machines, it will try to verify the values returned from
-// RDTSC on each processor are consistent with each other, and apply a handful
-// of workarounds for known buggy hardware. In other words, QPC is supposed to
-// give consistent result on a multiprocessor computer, but it is unreliable in
-// reality due to bugs in BIOS or HAL on some, especially old computers.
-// With recent updates on HAL and newer BIOS, QPC is getting more reliable but
-// it should be used with caution.
-//
-// (3) System time. The system time provides a low-resolution (typically 10ms
-// to 55 milliseconds) time stamp but is comparatively less expensive to
-// retrieve and more reliable.
-class HighResolutionTickClock V8_FINAL : public TickClock {
- public:
- explicit HighResolutionTickClock(int64_t ticks_per_second)
- : ticks_per_second_(ticks_per_second) {
- ASSERT_LT(0, ticks_per_second);
- }
- virtual ~HighResolutionTickClock() {}
-
- virtual int64_t Now() V8_OVERRIDE {
- LARGE_INTEGER now;
- BOOL result = QueryPerformanceCounter(&now);
- ASSERT(result);
- USE(result);
-
- // Intentionally calculate microseconds in a round about manner to avoid
- // overflow and precision issues. Think twice before simplifying!
- int64_t whole_seconds = now.QuadPart / ticks_per_second_;
- int64_t leftover_ticks = now.QuadPart % ticks_per_second_;
- int64_t ticks = (whole_seconds * Time::kMicrosecondsPerSecond) +
- ((leftover_ticks * Time::kMicrosecondsPerSecond) / ticks_per_second_);
-
- // Make sure we never return 0 here, so that TimeTicks::HighResNow()
- // will never return 0.
- return ticks + 1;
- }
-
- private:
- int64_t ticks_per_second_;
-};
-
-
-class RolloverProtectedTickClock V8_FINAL : public TickClock {
- public:
- RolloverProtectedTickClock()
- : mutex_(OS::CreateMutex()), last_seen_now_(0), rollover_ms_(1) {
- // We initialize rollover_ms_ to 1 to ensure that we will never
- // return 0 from TimeTicks::HighResNow() and TimeTicks::Now() below.
- }
- virtual ~RolloverProtectedTickClock() { delete mutex_; }
-
- virtual int64_t Now() V8_OVERRIDE {
- ScopedLock sl(mutex_);
- // We use timeGetTime() to implement TimeTicks::Now(), which rolls over
- // every ~49.7 days. We try to track rollover ourselves, which works if
- // TimeTicks::Now() is called at least every 49 days.
- // Note that we do not use GetTickCount() here, since timeGetTime() gives
- // more predictable delta values, as described here:
- // http://blogs.msdn.com/b/larryosterman/archive/2009/09/02/what-s-the-difference-between-gettickcount-and-timegettime.aspx
- DWORD now = timeGetTime();
- if (now < last_seen_now_) {
- rollover_ms_ += V8_INT64_C(0x100000000); // ~49.7 days.
- }
- last_seen_now_ = now;
- return now + rollover_ms_;
- }
-
- private:
- Mutex* mutex_;
- DWORD last_seen_now_;
- int64_t rollover_ms_;
-};
-
-
-static LazyDynamicInstance<RolloverProtectedTickClock,
- DefaultCreateTrait<RolloverProtectedTickClock>,
- ThreadSafeInitOnceTrait>::type tick_clock =
- LAZY_DYNAMIC_INSTANCE_INITIALIZER;
-
-
-struct CreateHighResTickClockTrait {
- static TickClock* Create() {
- // Check if the installed hardware supports a high-resolution performance
- // counter, and if not fallback to the low-resolution tick clock.
- LARGE_INTEGER ticks_per_second;
- if (!QueryPerformanceFrequency(&ticks_per_second)) {
- return tick_clock.Pointer();
- }
-
- // On Athlon X2 CPUs (e.g. model 15) the QueryPerformanceCounter
- // is unreliable, fallback to the low-resolution tick clock.
- CPU cpu;
- if (strcmp(cpu.vendor(), "AuthenticAMD") == 0 && cpu.family() == 15) {
- return tick_clock.Pointer();
- }
-
- return new HighResolutionTickClock(ticks_per_second.QuadPart);
- }
-};
-
-
-static LazyDynamicInstance<TickClock,
- CreateHighResTickClockTrait,
- ThreadSafeInitOnceTrait>::type high_res_tick_clock =
- LAZY_DYNAMIC_INSTANCE_INITIALIZER;
-
-
-TimeTicks TimeTicks::Now() {
- // Make sure we never return 0 here.
- TimeTicks ticks(tick_clock.Pointer()->Now());
- ASSERT(!ticks.IsNull());
- return ticks;
-}
-
-
-TimeTicks TimeTicks::HighResNow() {
- // Make sure we never return 0 here.
- TimeTicks ticks(high_res_tick_clock.Pointer()->Now());
- ASSERT(!ticks.IsNull());
- return ticks;
-}
-
-#else // V8_OS_WIN
-
-TimeTicks TimeTicks::Now() {
- return HighResNow();
-}
-
-
-TimeTicks TimeTicks::HighResNow() {
- int64_t ticks;
-#if V8_OS_MACOSX
- static struct mach_timebase_info info;
- if (info.denom == 0) {
- kern_return_t result = mach_timebase_info(&info);
- ASSERT_EQ(KERN_SUCCESS, result);
- USE(result);
- }
- ticks = (mach_absolute_time() / Time::kNanosecondsPerMicrosecond *
- info.numer / info.denom);
-#elif V8_OS_SOLARIS
- ticks = (gethrtime() / Time::kNanosecondsPerMicrosecond);
-#elif V8_OS_POSIX
- struct timespec ts;
- int result = clock_gettime(CLOCK_MONOTONIC, &ts);
- ASSERT_EQ(0, result);
- USE(result);
- ticks = (ts.tv_sec * Time::kMicrosecondsPerSecond +
- ts.tv_nsec / Time::kNanosecondsPerMicrosecond);
-#endif // V8_OS_MACOSX
- // Make sure we never return 0 here.
- return TimeTicks(ticks + 1);
-}
-
-#endif // V8_OS_WIN
-
-} } // namespace v8::internal
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