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| 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 | 5 |
| 6 // Windows Timer Primer | 6 // Windows Timer Primer |
| 7 // | 7 // |
| 8 // A good article: http://www.ddj.com/windows/184416651 | 8 // A good article: http://www.ddj.com/windows/184416651 |
| 9 // A good mozilla bug: http://bugzilla.mozilla.org/show_bug.cgi?id=363258 | 9 // A good mozilla bug: http://bugzilla.mozilla.org/show_bug.cgi?id=363258 |
| 10 // | 10 // |
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| 119 | 119 |
| 120 // Calculate the time elapsed since we started our timer | 120 // Calculate the time elapsed since we started our timer |
| 121 TimeDelta elapsed = ticks - initial_ticks; | 121 TimeDelta elapsed = ticks - initial_ticks; |
| 122 | 122 |
| 123 // Check if enough time has elapsed that we need to resync the clock. | 123 // Check if enough time has elapsed that we need to resync the clock. |
| 124 if (elapsed.InMilliseconds() > kMaxMillisecondsToAvoidDrift) { | 124 if (elapsed.InMilliseconds() > kMaxMillisecondsToAvoidDrift) { |
| 125 InitializeClock(); | 125 InitializeClock(); |
| 126 continue; | 126 continue; |
| 127 } | 127 } |
| 128 | 128 |
| 129 return elapsed + initial_time; | 129 return Time(elapsed + initial_time); |
| 130 } | 130 } |
| 131 } | 131 } |
| 132 | 132 |
| 133 // static | 133 // static |
| 134 Time Time::NowFromSystemTime() { |
| 135 // Force resync. |
| 136 InitializeClock(); |
| 137 return Time(initial_time); |
| 138 } |
| 139 |
| 140 // static |
| 134 Time Time::FromFileTime(FILETIME ft) { | 141 Time Time::FromFileTime(FILETIME ft) { |
| 135 return Time(FileTimeToMicroseconds(ft)); | 142 return Time(FileTimeToMicroseconds(ft)); |
| 136 } | 143 } |
| 137 | 144 |
| 138 FILETIME Time::ToFileTime() const { | 145 FILETIME Time::ToFileTime() const { |
| 139 FILETIME utc_ft; | 146 FILETIME utc_ft; |
| 140 MicrosecondsToFileTime(us_, &utc_ft); | 147 MicrosecondsToFileTime(us_, &utc_ft); |
| 141 return utc_ft; | 148 return utc_ft; |
| 142 } | 149 } |
| 143 | 150 |
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| 388 | 395 |
| 389 // static | 396 // static |
| 390 TimeTicks TimeTicks::Now() { | 397 TimeTicks TimeTicks::Now() { |
| 391 return TimeTicks() + Singleton<NowSingleton>::get()->Now(); | 398 return TimeTicks() + Singleton<NowSingleton>::get()->Now(); |
| 392 } | 399 } |
| 393 | 400 |
| 394 // static | 401 // static |
| 395 TimeTicks TimeTicks::HighResNow() { | 402 TimeTicks TimeTicks::HighResNow() { |
| 396 return TimeTicks() + Singleton<HighResNowSingleton>::get()->Now(); | 403 return TimeTicks() + Singleton<HighResNowSingleton>::get()->Now(); |
| 397 } | 404 } |
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