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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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226 : rollover_(TimeDelta::FromMilliseconds(0)), | 226 : rollover_(TimeDelta::FromMilliseconds(0)), |
227 last_seen_(0), | 227 last_seen_(0), |
228 hi_res_clock_enabled_(false) { | 228 hi_res_clock_enabled_(false) { |
229 base::SystemMonitor* system = base::SystemMonitor::Get(); | 229 base::SystemMonitor* system = base::SystemMonitor::Get(); |
230 system->AddObserver(this); | 230 system->AddObserver(this); |
231 UseHiResClock(!system->BatteryPower()); | 231 UseHiResClock(!system->BatteryPower()); |
232 } | 232 } |
233 | 233 |
234 ~NowSingleton() { | 234 ~NowSingleton() { |
235 UseHiResClock(false); | 235 UseHiResClock(false); |
236 base::SystemMonitor::Get()->RemoveObserver(this); | 236 base::SystemMonitor* monitor = base::SystemMonitor::Get(); |
| 237 if (monitor) |
| 238 monitor->RemoveObserver(this); |
237 } | 239 } |
238 | 240 |
239 TimeDelta Now() { | 241 TimeDelta Now() { |
240 AutoLock locked(lock_); | 242 AutoLock locked(lock_); |
241 // We should hold the lock while calling tick_function to make sure that | 243 // We should hold the lock while calling tick_function to make sure that |
242 // we keep our last_seen_ stay correctly in sync. | 244 // we keep our last_seen_ stay correctly in sync. |
243 DWORD now = tick_function(); | 245 DWORD now = tick_function(); |
244 if (now < last_seen_) | 246 if (now < last_seen_) |
245 rollover_ += TimeDelta::FromMilliseconds(0x100000000I64); // ~49.7 days. | 247 rollover_ += TimeDelta::FromMilliseconds(0x100000000I64); // ~49.7 days. |
246 last_seen_ = now; | 248 last_seen_ = now; |
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386 | 388 |
387 // static | 389 // static |
388 TimeTicks TimeTicks::Now() { | 390 TimeTicks TimeTicks::Now() { |
389 return TimeTicks() + Singleton<NowSingleton>::get()->Now(); | 391 return TimeTicks() + Singleton<NowSingleton>::get()->Now(); |
390 } | 392 } |
391 | 393 |
392 // static | 394 // static |
393 TimeTicks TimeTicks::HighResNow() { | 395 TimeTicks TimeTicks::HighResNow() { |
394 return TimeTicks() + Singleton<HighResNowSingleton>::get()->Now(); | 396 return TimeTicks() + Singleton<HighResNowSingleton>::get()->Now(); |
395 } | 397 } |
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