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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 // Time represents an absolute point in coordinated universal time (UTC), | 5 // Time represents an absolute point in coordinated universal time (UTC), |
6 // internally represented as microseconds (s/1,000,000) since the Windows epoch | 6 // internally represented as microseconds (s/1,000,000) since the Windows epoch |
7 // (1601-01-01 00:00:00 UTC) (See http://crbug.com/14734). System-dependent | 7 // (1601-01-01 00:00:00 UTC) (See http://crbug.com/14734). System-dependent |
8 // clock interface routines are defined in time_PLATFORM.cc. | 8 // clock interface routines are defined in time_PLATFORM.cc. |
9 // | 9 // |
10 // TimeDelta represents a duration of time, internally represented in | 10 // TimeDelta represents a duration of time, internally represented in |
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68 | 68 |
69 // Converts units of time to TimeDeltas. | 69 // Converts units of time to TimeDeltas. |
70 static TimeDelta FromDays(int days); | 70 static TimeDelta FromDays(int days); |
71 static TimeDelta FromHours(int hours); | 71 static TimeDelta FromHours(int hours); |
72 static TimeDelta FromMinutes(int minutes); | 72 static TimeDelta FromMinutes(int minutes); |
73 static TimeDelta FromSeconds(int64 secs); | 73 static TimeDelta FromSeconds(int64 secs); |
74 static TimeDelta FromMilliseconds(int64 ms); | 74 static TimeDelta FromMilliseconds(int64 ms); |
75 static TimeDelta FromSecondsD(double secs); | 75 static TimeDelta FromSecondsD(double secs); |
76 static TimeDelta FromMillisecondsD(double ms); | 76 static TimeDelta FromMillisecondsD(double ms); |
77 static TimeDelta FromMicroseconds(int64 us); | 77 static TimeDelta FromMicroseconds(int64 us); |
| 78 static TimeDelta FromNanoseconds(int64 ns); |
78 #if defined(OS_WIN) | 79 #if defined(OS_WIN) |
79 static TimeDelta FromQPCValue(LONGLONG qpc_value); | 80 static TimeDelta FromQPCValue(LONGLONG qpc_value); |
80 #endif | 81 #endif |
81 | 82 |
82 // Converts an integer value representing TimeDelta to a class. This is used | 83 // Converts an integer value representing TimeDelta to a class. This is used |
83 // when deserializing a |TimeDelta| structure, using a value known to be | 84 // when deserializing a |TimeDelta| structure, using a value known to be |
84 // compatible. It is not provided as a constructor because the integer type | 85 // compatible. It is not provided as a constructor because the integer type |
85 // may be unclear from the perspective of a caller. | 86 // may be unclear from the perspective of a caller. |
86 static TimeDelta FromInternalValue(int64 delta) { | 87 static TimeDelta FromInternalValue(int64 delta) { |
87 return TimeDelta(delta); | 88 return TimeDelta(delta); |
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568 } | 569 } |
569 | 570 |
570 // static | 571 // static |
571 inline TimeDelta TimeDelta::FromMicroseconds(int64 us) { | 572 inline TimeDelta TimeDelta::FromMicroseconds(int64 us) { |
572 // Preserve max to prevent overflow. | 573 // Preserve max to prevent overflow. |
573 if (us == std::numeric_limits<int64>::max()) | 574 if (us == std::numeric_limits<int64>::max()) |
574 return Max(); | 575 return Max(); |
575 return TimeDelta(us); | 576 return TimeDelta(us); |
576 } | 577 } |
577 | 578 |
| 579 // static |
| 580 inline TimeDelta TimeDelta::FromNanoseconds(int64 ns) { |
| 581 // Preserve max to prevent overflow. |
| 582 if (ns == std::numeric_limits<int64>::max()) |
| 583 return Max(); |
| 584 return TimeDelta(ns / Time::kNanosecondsPerMicrosecond); |
| 585 } |
| 586 |
578 inline Time TimeDelta::operator+(Time t) const { | 587 inline Time TimeDelta::operator+(Time t) const { |
579 return Time(t.us_ + delta_); | 588 return Time(t.us_ + delta_); |
580 } | 589 } |
581 | 590 |
582 // For logging use only. | 591 // For logging use only. |
583 BASE_EXPORT std::ostream& operator<<(std::ostream& os, Time time); | 592 BASE_EXPORT std::ostream& operator<<(std::ostream& os, Time time); |
584 | 593 |
585 // TimeTicks ------------------------------------------------------------------ | 594 // TimeTicks ------------------------------------------------------------------ |
586 | 595 |
587 class BASE_EXPORT TimeTicks { | 596 class BASE_EXPORT TimeTicks { |
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754 inline TimeTicks TimeDelta::operator+(TimeTicks t) const { | 763 inline TimeTicks TimeDelta::operator+(TimeTicks t) const { |
755 return TimeTicks(t.ticks_ + delta_); | 764 return TimeTicks(t.ticks_ + delta_); |
756 } | 765 } |
757 | 766 |
758 // For logging use only. | 767 // For logging use only. |
759 BASE_EXPORT std::ostream& operator<<(std::ostream& os, TimeTicks time_ticks); | 768 BASE_EXPORT std::ostream& operator<<(std::ostream& os, TimeTicks time_ticks); |
760 | 769 |
761 } // namespace base | 770 } // namespace base |
762 | 771 |
763 #endif // BASE_TIME_TIME_H_ | 772 #endif // BASE_TIME_TIME_H_ |
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