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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/time.h"
#include "base/string_util.h"
#include "base/third_party/nspr/prtime.h"
#include "base/logging.h"
namespace {
// Time between resampling the un-granular clock for this API. 60 seconds.
const int kMaxMillisecondsToAvoidDrift = 60 * Time::kMillisecondsPerSecond;
} // namespace
// TimeDelta ------------------------------------------------------------------
// static
TimeDelta TimeDelta::FromDays(int64 days) {
return TimeDelta(days * Time::kMicrosecondsPerDay);
}
// static
TimeDelta TimeDelta::FromHours(int64 hours) {
return TimeDelta(hours * Time::kMicrosecondsPerHour);
}
// static
TimeDelta TimeDelta::FromMinutes(int64 minutes) {
return TimeDelta(minutes * Time::kMicrosecondsPerMinute);
}
// static
TimeDelta TimeDelta::FromSeconds(int64 secs) {
return TimeDelta(secs * Time::kMicrosecondsPerSecond);
}
// static
TimeDelta TimeDelta::FromMilliseconds(int64 ms) {
return TimeDelta(ms * Time::kMicrosecondsPerMillisecond);
}
// static
TimeDelta TimeDelta::FromMicroseconds(int64 us) {
return TimeDelta(us);
}
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 TimeDelta::InSeconds() const {
return delta_ / Time::kMicrosecondsPerSecond;
}
double TimeDelta::InMillisecondsF() const {
return static_cast<double>(delta_) / Time::kMicrosecondsPerMillisecond;
}
int64 TimeDelta::InMilliseconds() const {
return delta_ / Time::kMicrosecondsPerMillisecond;
}
int64 TimeDelta::InMicroseconds() const {
return delta_;
}
// Time -----------------------------------------------------------------------
int64 Time::initial_time_ = 0;
TimeTicks Time::initial_ticks_;
// static
void Time::InitializeClock()
{
initial_ticks_ = TimeTicks::Now();
initial_time_ = CurrentWallclockMicroseconds();
}
// static
Time Time::Now() {
if (initial_time_ == 0)
InitializeClock();
// We implement time using the high-resolution timers so that we can get
// timeouts which are smaller than 10-15ms. If we just used
// CurrentWallclockMicroseconds(), we'd have the less-granular timer.
//
// To make this work, we initialize the clock (initial_time) and the
// counter (initial_ctr). To compute the initial time, we can check
// the number of ticks that have elapsed, and compute the delta.
//
// To avoid any drift, we periodically resync the counters to the system
// clock.
while(true) {
TimeTicks ticks = TimeTicks::Now();
// Calculate the time elapsed since we started our timer
TimeDelta elapsed = ticks - initial_ticks_;
// Check if enough time has elapsed that we need to resync the clock.
if (elapsed.InMilliseconds() > kMaxMillisecondsToAvoidDrift) {
InitializeClock();
continue;
}
return elapsed + initial_time_;
}
}
// static
Time Time::FromTimeT(time_t tt) {
if (tt == 0)
return Time(); // Preserve 0 so we can tell it doesn't exist.
return (tt * kMicrosecondsPerSecond) + kTimeTToMicrosecondsOffset;
}
time_t Time::ToTimeT() const {
if (us_ == 0)
return 0; // Preserve 0 so we can tell it doesn't exist.
return (us_ - kTimeTToMicrosecondsOffset) / kMicrosecondsPerSecond;
}
double Time::ToDoubleT() const {
if (us_ == 0)
return 0; // Preserve 0 so we can tell it doesn't exist.
return (static_cast<double>(us_ - kTimeTToMicrosecondsOffset) /
static_cast<double>(kMicrosecondsPerSecond));
}
Time Time::LocalMidnight() const {
Exploded exploded;
LocalExplode(&exploded);
exploded.hour = 0;
exploded.minute = 0;
exploded.second = 0;
exploded.millisecond = 0;
return FromLocalExploded(exploded);
}
// static
bool Time::FromString(const wchar_t* time_string, Time* parsed_time) {
DCHECK((time_string != NULL) && (parsed_time != NULL));
std::string ascii_time_string = WideToUTF8(time_string);
if (ascii_time_string.length() == 0)
return false;
PRTime result_time = 0;
PRStatus result = PR_ParseTimeString(ascii_time_string.c_str(), PR_FALSE,
&result_time);
if (PR_SUCCESS != result)
return false;
result_time += kTimeTToMicrosecondsOffset;
*parsed_time = Time(result_time);
return true;
}
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