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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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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| 27 // article about this here: | 27 // article about this here: |
| 28 // http://softwarecommunity.intel.com/articles/eng/1086.htm | 28 // http://softwarecommunity.intel.com/articles/eng/1086.htm |
| 29 // | 29 // |
| 30 // To work around all this, we're going to generally use timeGetTime(). We | 30 // To work around all this, we're going to generally use timeGetTime(). We |
| 31 // will only increase the system-wide timer if we're not running on battery | 31 // will only increase the system-wide timer if we're not running on battery |
| 32 // power. Using timeBeginPeriod(1) is a requirement in order to make our | 32 // power. Using timeBeginPeriod(1) is a requirement in order to make our |
| 33 // message loop waits have the same resolution that our time measurements | 33 // message loop waits have the same resolution that our time measurements |
| 34 // do. Otherwise, WaitForSingleObject(..., 1) will no less than 15ms when | 34 // do. Otherwise, WaitForSingleObject(..., 1) will no less than 15ms when |
| 35 // there is nothing else to waken the Wait. | 35 // there is nothing else to waken the Wait. |
| 36 | 36 |
| 37 #include "base/time.h" | 37 #include "base/time/time.h" |
| 38 | 38 |
| 39 #pragma comment(lib, "winmm.lib") | 39 #pragma comment(lib, "winmm.lib") |
| 40 #include <windows.h> | 40 #include <windows.h> |
| 41 #include <mmsystem.h> | 41 #include <mmsystem.h> |
| 42 | 42 |
| 43 #include "base/basictypes.h" | 43 #include "base/basictypes.h" |
| 44 #include "base/cpu.h" |
| 44 #include "base/logging.h" | 45 #include "base/logging.h" |
| 45 #include "base/cpu.h" | |
| 46 #include "base/memory/singleton.h" | 46 #include "base/memory/singleton.h" |
| 47 #include "base/synchronization/lock.h" | 47 #include "base/synchronization/lock.h" |
| 48 | 48 |
| 49 using base::Time; | 49 using base::Time; |
| 50 using base::TimeDelta; | 50 using base::TimeDelta; |
| 51 using base::TimeTicks; | 51 using base::TimeTicks; |
| 52 | 52 |
| 53 namespace { | 53 namespace { |
| 54 | 54 |
| 55 // From MSDN, FILETIME "Contains a 64-bit value representing the number of | 55 // From MSDN, FILETIME "Contains a 64-bit value representing the number of |
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| 477 return HighResNowSingleton::GetInstance()->IsUsingHighResClock(); | 477 return HighResNowSingleton::GetInstance()->IsUsingHighResClock(); |
| 478 } | 478 } |
| 479 | 479 |
| 480 // TimeDelta ------------------------------------------------------------------ | 480 // TimeDelta ------------------------------------------------------------------ |
| 481 | 481 |
| 482 // static | 482 // static |
| 483 TimeDelta TimeDelta::FromQPCValue(LONGLONG qpc_value) { | 483 TimeDelta TimeDelta::FromQPCValue(LONGLONG qpc_value) { |
| 484 return TimeDelta( | 484 return TimeDelta( |
| 485 HighResNowSingleton::GetInstance()->QPCValueToMicroseconds(qpc_value)); | 485 HighResNowSingleton::GetInstance()->QPCValueToMicroseconds(qpc_value)); |
| 486 } | 486 } |
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