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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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596 | 596 |
597 TimeTicks() : ticks_(0) { | 597 TimeTicks() : ticks_(0) { |
598 } | 598 } |
599 | 599 |
600 // Platform-dependent tick count representing "right now." When | 600 // Platform-dependent tick count representing "right now." When |
601 // IsHighResolution() returns false, the resolution of the clock could be | 601 // IsHighResolution() returns false, the resolution of the clock could be |
602 // as coarse as ~15.6ms. Otherwise, the resolution should be no worse than one | 602 // as coarse as ~15.6ms. Otherwise, the resolution should be no worse than one |
603 // microsecond. | 603 // microsecond. |
604 static TimeTicks Now(); | 604 static TimeTicks Now(); |
605 | 605 |
606 // DEPRECATED | |
607 // TODO(miu): Remove this function, and all callpoints should call Now(). | |
608 static TimeTicks HighResNow() { return TimeTicks::Now(); } | |
609 | |
610 // Returns true if the high resolution clock is working on this system and | 606 // Returns true if the high resolution clock is working on this system and |
611 // Now() will return high resolution values. Note that, on systems where the | 607 // Now() will return high resolution values. Note that, on systems where the |
612 // high resolution clock works but is deemed inefficient, the low resolution | 608 // high resolution clock works but is deemed inefficient, the low resolution |
613 // clock will be used instead. | 609 // clock will be used instead. |
614 static bool IsHighResolution(); | 610 static bool IsHighResolution(); |
615 | 611 |
616 // DEPRECATED | |
617 // TODO(miu): Remove this function, and all callpoints should call | |
618 // IsHighResolution(). | |
619 static bool IsHighResNowFastAndReliable() { return IsHighResolution(); } | |
620 | |
621 // Returns true if ThreadNow() is supported on this system. | 612 // Returns true if ThreadNow() is supported on this system. |
622 static bool IsThreadNowSupported() { | 613 static bool IsThreadNowSupported() { |
623 #if (defined(_POSIX_THREAD_CPUTIME) && (_POSIX_THREAD_CPUTIME >= 0)) || \ | 614 #if (defined(_POSIX_THREAD_CPUTIME) && (_POSIX_THREAD_CPUTIME >= 0)) || \ |
624 (defined(OS_MACOSX) && !defined(OS_IOS)) || defined(OS_ANDROID) | 615 (defined(OS_MACOSX) && !defined(OS_IOS)) || defined(OS_ANDROID) |
625 return true; | 616 return true; |
626 #else | 617 #else |
627 return false; | 618 return false; |
628 #endif | 619 #endif |
629 } | 620 } |
630 | 621 |
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757 inline TimeTicks TimeDelta::operator+(TimeTicks t) const { | 748 inline TimeTicks TimeDelta::operator+(TimeTicks t) const { |
758 return TimeTicks(t.ticks_ + delta_); | 749 return TimeTicks(t.ticks_ + delta_); |
759 } | 750 } |
760 | 751 |
761 // For logging use only. | 752 // For logging use only. |
762 BASE_EXPORT std::ostream& operator<<(std::ostream& os, TimeTicks time_ticks); | 753 BASE_EXPORT std::ostream& operator<<(std::ostream& os, TimeTicks time_ticks); |
763 | 754 |
764 } // namespace base | 755 } // namespace base |
765 | 756 |
766 #endif // BASE_TIME_TIME_H_ | 757 #endif // BASE_TIME_TIME_H_ |
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