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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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182 | 182 |
183 // Calculate the time elapsed since we started our timer | 183 // Calculate the time elapsed since we started our timer |
184 TimeDelta elapsed = ticks - initial_ticks; | 184 TimeDelta elapsed = ticks - initial_ticks; |
185 | 185 |
186 // Check if enough time has elapsed that we need to resync the clock. | 186 // Check if enough time has elapsed that we need to resync the clock. |
187 if (elapsed.InMilliseconds() > kMaxMillisecondsToAvoidDrift) { | 187 if (elapsed.InMilliseconds() > kMaxMillisecondsToAvoidDrift) { |
188 InitializeClock(); | 188 InitializeClock(); |
189 continue; | 189 continue; |
190 } | 190 } |
191 | 191 |
192 return Time(elapsed + initial_time); | 192 return Time(elapsed + Time(initial_time)); |
193 } | 193 } |
194 } | 194 } |
195 | 195 |
196 // static | 196 // static |
197 Time Time::NowFromSystemTime() { | 197 Time Time::NowFromSystemTime() { |
198 // Force resync. | 198 // Force resync. |
199 InitializeClock(); | 199 InitializeClock(); |
200 return Time(initial_time); | 200 return Time(initial_time); |
201 } | 201 } |
202 | 202 |
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440 | 440 |
441 // static | 441 // static |
442 TimeTicks TimeTicks::Now() { | 442 TimeTicks TimeTicks::Now() { |
443 return TimeTicks() + Singleton<NowSingleton>::get()->Now(); | 443 return TimeTicks() + Singleton<NowSingleton>::get()->Now(); |
444 } | 444 } |
445 | 445 |
446 // static | 446 // static |
447 TimeTicks TimeTicks::HighResNow() { | 447 TimeTicks TimeTicks::HighResNow() { |
448 return TimeTicks() + Singleton<HighResNowSingleton>::get()->Now(); | 448 return TimeTicks() + Singleton<HighResNowSingleton>::get()->Now(); |
449 } | 449 } |
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