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Issue 18063004: Move timing files into base/time, install forwarding headers. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: ios Created 7 years, 5 months ago
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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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