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117 lines
3.3 KiB
C++
117 lines
3.3 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/time/time.h"
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#include <stdint.h>
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#include <sys/time.h>
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#include <time.h>
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#if defined(OS_ANDROID) && !defined(__LP64__)
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#include <time64.h>
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#endif
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#include <unistd.h>
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#include "base/logging.h"
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#include "base/numerics/safe_math.h"
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#include "build/build_config.h"
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// Ensure the Fuchsia and Mac builds do not include this module. Instead,
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// non-POSIX implementation is used for sampling the system clocks.
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#if defined(OS_FUCHSIA) || defined(OS_MACOSX)
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#error "This implementation is for POSIX platforms other than Fuchsia or Mac."
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#endif
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namespace {
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int64_t ConvertTimespecToMicros(const struct timespec& ts) {
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// On 32-bit systems, the calculation cannot overflow int64_t.
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// 2**32 * 1000000 + 2**64 / 1000 < 2**63
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if (sizeof(ts.tv_sec) <= 4 && sizeof(ts.tv_nsec) <= 8) {
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int64_t result = ts.tv_sec;
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result *= base::Time::kMicrosecondsPerSecond;
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result += (ts.tv_nsec / base::Time::kNanosecondsPerMicrosecond);
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return result;
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} else {
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base::CheckedNumeric<int64_t> result(ts.tv_sec);
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result *= base::Time::kMicrosecondsPerSecond;
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result += (ts.tv_nsec / base::Time::kNanosecondsPerMicrosecond);
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return result.ValueOrDie();
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}
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}
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// Helper function to get results from clock_gettime() and convert to a
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// microsecond timebase. Minimum requirement is MONOTONIC_CLOCK to be supported
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// on the system. FreeBSD 6 has CLOCK_MONOTONIC but defines
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// _POSIX_MONOTONIC_CLOCK to -1.
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#if (defined(OS_POSIX) && defined(_POSIX_MONOTONIC_CLOCK) && \
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_POSIX_MONOTONIC_CLOCK >= 0) || \
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defined(OS_BSD) || defined(OS_ANDROID)
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int64_t ClockNow(clockid_t clk_id) {
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struct timespec ts;
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CHECK(clock_gettime(clk_id, &ts) == 0);
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return ConvertTimespecToMicros(ts);
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}
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#else // _POSIX_MONOTONIC_CLOCK
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#error No usable tick clock function on this platform.
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#endif // _POSIX_MONOTONIC_CLOCK
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} // namespace
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namespace base {
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// Time -----------------------------------------------------------------------
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// static
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Time Time::Now() {
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struct timeval tv;
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struct timezone tz = {0, 0}; // UTC
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CHECK(gettimeofday(&tv, &tz) == 0);
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// Combine seconds and microseconds in a 64-bit field containing microseconds
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// since the epoch. That's enough for nearly 600 centuries. Adjust from
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// Unix (1970) to Windows (1601) epoch.
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return Time((tv.tv_sec * kMicrosecondsPerSecond + tv.tv_usec) +
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kTimeTToMicrosecondsOffset);
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}
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// static
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Time Time::NowFromSystemTime() {
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// Just use Now() because Now() returns the system time.
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return Now();
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}
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// TimeTicks ------------------------------------------------------------------
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// static
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TimeTicks TimeTicks::Now() {
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return TimeTicks(ClockNow(CLOCK_MONOTONIC));
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}
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// static
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TimeTicks::Clock TimeTicks::GetClock() {
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return Clock::LINUX_CLOCK_MONOTONIC;
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}
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// static
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bool TimeTicks::IsHighResolution() {
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return true;
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}
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// static
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bool TimeTicks::IsConsistentAcrossProcesses() {
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return true;
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}
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// static
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ThreadTicks ThreadTicks::Now() {
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#if (defined(_POSIX_THREAD_CPUTIME) && (_POSIX_THREAD_CPUTIME >= 0)) || \
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defined(OS_ANDROID)
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return ThreadTicks(ClockNow(CLOCK_THREAD_CPUTIME_ID));
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#else
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NOTREACHED();
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return ThreadTicks();
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#endif
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}
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} // namespace base
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