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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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| 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. | 32 // power. |
| 33 | 33 |
| 34 #include "base/time/time.h" | 34 #include "base/time/time.h" |
| 35 | 35 |
| 36 #pragma comment(lib, "winmm.lib") | 36 #pragma comment(lib, "winmm.lib") |
| 37 #include <windows.h> | 37 #include <windows.h> |
| 38 #include <mmsystem.h> | 38 #include <mmsystem.h> |
| 39 #include <stdint.h> |
| 39 | 40 |
| 40 #include "base/basictypes.h" | 41 #include "base/basictypes.h" |
| 41 #include "base/cpu.h" | 42 #include "base/cpu.h" |
| 42 #include "base/lazy_instance.h" | 43 #include "base/lazy_instance.h" |
| 43 #include "base/logging.h" | 44 #include "base/logging.h" |
| 44 #include "base/synchronization/lock.h" | 45 #include "base/synchronization/lock.h" |
| 45 | 46 |
| 46 using base::Time; | 47 using base::Time; |
| 47 using base::TimeDelta; | 48 using base::TimeDelta; |
| 48 using base::TimeTicks; | 49 using base::TimeTicks; |
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| 99 | 100 |
| 100 } // namespace | 101 } // namespace |
| 101 | 102 |
| 102 // Time ----------------------------------------------------------------------- | 103 // Time ----------------------------------------------------------------------- |
| 103 | 104 |
| 104 // The internal representation of Time uses FILETIME, whose epoch is 1601-01-01 | 105 // The internal representation of Time uses FILETIME, whose epoch is 1601-01-01 |
| 105 // 00:00:00 UTC. ((1970-1601)*365+89)*24*60*60*1000*1000, where 89 is the | 106 // 00:00:00 UTC. ((1970-1601)*365+89)*24*60*60*1000*1000, where 89 is the |
| 106 // number of leap year days between 1601 and 1970: (1970-1601)/4 excluding | 107 // number of leap year days between 1601 and 1970: (1970-1601)/4 excluding |
| 107 // 1700, 1800, and 1900. | 108 // 1700, 1800, and 1900. |
| 108 // static | 109 // static |
| 109 const int64 Time::kTimeTToMicrosecondsOffset = GG_INT64_C(11644473600000000); | 110 const int64 Time::kTimeTToMicrosecondsOffset = INT64_C(11644473600000000); |
| 110 | 111 |
| 111 // static | 112 // static |
| 112 Time Time::Now() { | 113 Time Time::Now() { |
| 113 if (initial_time == 0) | 114 if (initial_time == 0) |
| 114 InitializeClock(); | 115 InitializeClock(); |
| 115 | 116 |
| 116 // We implement time using the high-resolution timers so that we can get | 117 // We implement time using the high-resolution timers so that we can get |
| 117 // timeouts which are smaller than 10-15ms. If we just used | 118 // timeouts which are smaller than 10-15ms. If we just used |
| 118 // CurrentWallclockMicroseconds(), we'd have the less-granular timer. | 119 // CurrentWallclockMicroseconds(), we'd have the less-granular timer. |
| 119 // | 120 // |
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| 518 TimeTicks TimeTicks::FromQPCValue(LONGLONG qpc_value) { | 519 TimeTicks TimeTicks::FromQPCValue(LONGLONG qpc_value) { |
| 519 return TimeTicks() + QPCValueToTimeDelta(qpc_value); | 520 return TimeTicks() + QPCValueToTimeDelta(qpc_value); |
| 520 } | 521 } |
| 521 | 522 |
| 522 // TimeDelta ------------------------------------------------------------------ | 523 // TimeDelta ------------------------------------------------------------------ |
| 523 | 524 |
| 524 // static | 525 // static |
| 525 TimeDelta TimeDelta::FromQPCValue(LONGLONG qpc_value) { | 526 TimeDelta TimeDelta::FromQPCValue(LONGLONG qpc_value) { |
| 526 return QPCValueToTimeDelta(qpc_value); | 527 return QPCValueToTimeDelta(qpc_value); |
| 527 } | 528 } |
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