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Side by Side Diff: base/time/time.h

Issue 1446363003: Deleted OS_WIN and all Windows specific files from base. (Closed) Base URL: https://github.com/domokit/mojo.git@base_tests
Patch Set: Created 5 years, 1 month 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 // 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). System-dependent clock interface routines are 7 // (1601-01-01 00:00:00 UTC). System-dependent clock interface routines are
8 // defined in time_PLATFORM.cc. Note that values for Time may skew and jump 8 // defined in time_PLATFORM.cc. Note that values for Time may skew and jump
9 // around as the operating system makes adjustments to synchronize (e.g., with 9 // around as the operating system makes adjustments to synchronize (e.g., with
10 // NTP servers). Thus, client code that uses the Time class must account for 10 // NTP servers). Thus, client code that uses the Time class must account for
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68 #include <CoreFoundation/CoreFoundation.h> 68 #include <CoreFoundation/CoreFoundation.h>
69 // Avoid Mac system header macro leak. 69 // Avoid Mac system header macro leak.
70 #undef TYPE_BOOL 70 #undef TYPE_BOOL
71 #endif 71 #endif
72 72
73 #if defined(OS_POSIX) 73 #if defined(OS_POSIX)
74 #include <unistd.h> 74 #include <unistd.h>
75 #include <sys/time.h> 75 #include <sys/time.h>
76 #endif 76 #endif
77 77
78 #if defined(OS_WIN)
79 // For FILETIME in FromFileTime, until it moves to a new converter class.
80 // See TODO(iyengar) below.
81 #include <windows.h>
82 #endif
83
84 #include <limits> 78 #include <limits>
85 79
86 namespace base { 80 namespace base {
87 81
88 class TimeDelta; 82 class TimeDelta;
89 83
90 // The functions in the time_internal namespace are meant to be used only by the 84 // The functions in the time_internal namespace are meant to be used only by the
91 // time classes and functions. Please use the math operators defined in the 85 // time classes and functions. Please use the math operators defined in the
92 // time classes instead. 86 // time classes instead.
93 namespace time_internal { 87 namespace time_internal {
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112 106
113 // Converts units of time to TimeDeltas. 107 // Converts units of time to TimeDeltas.
114 static TimeDelta FromDays(int days); 108 static TimeDelta FromDays(int days);
115 static TimeDelta FromHours(int hours); 109 static TimeDelta FromHours(int hours);
116 static TimeDelta FromMinutes(int minutes); 110 static TimeDelta FromMinutes(int minutes);
117 static TimeDelta FromSeconds(int64 secs); 111 static TimeDelta FromSeconds(int64 secs);
118 static TimeDelta FromMilliseconds(int64 ms); 112 static TimeDelta FromMilliseconds(int64 ms);
119 static TimeDelta FromSecondsD(double secs); 113 static TimeDelta FromSecondsD(double secs);
120 static TimeDelta FromMillisecondsD(double ms); 114 static TimeDelta FromMillisecondsD(double ms);
121 static TimeDelta FromMicroseconds(int64 us); 115 static TimeDelta FromMicroseconds(int64 us);
122 #if defined(OS_WIN)
123 static TimeDelta FromQPCValue(LONGLONG qpc_value);
124 #endif
125 116
126 // Converts an integer value representing TimeDelta to a class. This is used 117 // Converts an integer value representing TimeDelta to a class. This is used
127 // when deserializing a |TimeDelta| structure, using a value known to be 118 // when deserializing a |TimeDelta| structure, using a value known to be
128 // compatible. It is not provided as a constructor because the integer type 119 // compatible. It is not provided as a constructor because the integer type
129 // may be unclear from the perspective of a caller. 120 // may be unclear from the perspective of a caller.
130 static TimeDelta FromInternalValue(int64 delta) { 121 static TimeDelta FromInternalValue(int64 delta) {
131 return TimeDelta(delta); 122 return TimeDelta(delta);
132 } 123 }
133 124
134 // Returns the maximum time delta, which should be greater than any reasonable 125 // Returns the maximum time delta, which should be greater than any reasonable
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398 // Time ----------------------------------------------------------------------- 389 // Time -----------------------------------------------------------------------
399 390
400 // Represents a wall clock time in UTC. Values are not guaranteed to be 391 // Represents a wall clock time in UTC. Values are not guaranteed to be
401 // monotonically non-decreasing and are subject to large amounts of skew. 392 // monotonically non-decreasing and are subject to large amounts of skew.
402 class BASE_EXPORT Time : public time_internal::TimeBase<Time> { 393 class BASE_EXPORT Time : public time_internal::TimeBase<Time> {
403 public: 394 public:
404 // The representation of Jan 1, 1970 UTC in microseconds since the 395 // The representation of Jan 1, 1970 UTC in microseconds since the
405 // platform-dependent epoch. 396 // platform-dependent epoch.
406 static const int64 kTimeTToMicrosecondsOffset; 397 static const int64 kTimeTToMicrosecondsOffset;
407 398
408 #if !defined(OS_WIN)
409 // On Mac & Linux, this value is the delta from the Windows epoch of 1601 to 399 // On Mac & Linux, this value is the delta from the Windows epoch of 1601 to
410 // the Posix delta of 1970. This is used for migrating between the old 400 // the Posix delta of 1970. This is used for migrating between the old
411 // 1970-based epochs to the new 1601-based ones. It should be removed from 401 // 1970-based epochs to the new 1601-based ones. It should be removed from
412 // this global header and put in the platform-specific ones when we remove the 402 // this global header and put in the platform-specific ones when we remove the
413 // migration code. 403 // migration code.
414 static const int64 kWindowsEpochDeltaMicroseconds; 404 static const int64 kWindowsEpochDeltaMicroseconds;
415 #else
416 // To avoid overflow in QPC to Microseconds calculations, since we multiply
417 // by kMicrosecondsPerSecond, then the QPC value should not exceed
418 // (2^63 - 1) / 1E6. If it exceeds that threshold, we divide then multiply.
419 static const int64 kQPCOverflowThreshold = 0x8637BD05AF7;
420 #endif
421 405
422 // Represents an exploded time that can be formatted nicely. This is kind of 406 // Represents an exploded time that can be formatted nicely. This is kind of
423 // like the Win32 SYSTEMTIME structure or the Unix "struct tm" with a few 407 // like the Win32 SYSTEMTIME structure or the Unix "struct tm" with a few
424 // additions and changes to prevent errors. 408 // additions and changes to prevent errors.
425 struct BASE_EXPORT Exploded { 409 struct BASE_EXPORT Exploded {
426 int year; // Four digit year "2007" 410 int year; // Four digit year "2007"
427 int month; // 1-based month (values 1 = January, etc.) 411 int month; // 1-based month (values 1 = January, etc.)
428 int day_of_week; // 0-based day of week (0 = Sunday, etc.) 412 int day_of_week; // 0-based day of week (0 = Sunday, etc.)
429 int day_of_month; // 1-based day of month (1-31) 413 int day_of_month; // 1-based day of month (1-31)
430 int hour; // Hour within the current day (0-23) 414 int hour; // Hour within the current day (0-23)
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496 #if defined(OS_POSIX) 480 #if defined(OS_POSIX)
497 static Time FromTimeVal(struct timeval t); 481 static Time FromTimeVal(struct timeval t);
498 struct timeval ToTimeVal() const; 482 struct timeval ToTimeVal() const;
499 #endif 483 #endif
500 484
501 #if defined(OS_MACOSX) 485 #if defined(OS_MACOSX)
502 static Time FromCFAbsoluteTime(CFAbsoluteTime t); 486 static Time FromCFAbsoluteTime(CFAbsoluteTime t);
503 CFAbsoluteTime ToCFAbsoluteTime() const; 487 CFAbsoluteTime ToCFAbsoluteTime() const;
504 #endif 488 #endif
505 489
506 #if defined(OS_WIN)
507 static Time FromFileTime(FILETIME ft);
508 FILETIME ToFileTime() const;
509
510 // The minimum time of a low resolution timer. This is basically a windows
511 // constant of ~15.6ms. While it does vary on some older OS versions, we'll
512 // treat it as static across all windows versions.
513 static const int kMinLowResolutionThresholdMs = 16;
514
515 // Enable or disable Windows high resolution timer.
516 static void EnableHighResolutionTimer(bool enable);
517
518 // Activates or deactivates the high resolution timer based on the |activate|
519 // flag. If the HighResolutionTimer is not Enabled (see
520 // EnableHighResolutionTimer), this function will return false. Otherwise
521 // returns true. Each successful activate call must be paired with a
522 // subsequent deactivate call.
523 // All callers to activate the high resolution timer must eventually call
524 // this function to deactivate the high resolution timer.
525 static bool ActivateHighResolutionTimer(bool activate);
526
527 // Returns true if the high resolution timer is both enabled and activated.
528 // This is provided for testing only, and is not tracked in a thread-safe
529 // way.
530 static bool IsHighResolutionTimerInUse();
531 #endif
532
533 // Converts an exploded structure representing either the local time or UTC 490 // Converts an exploded structure representing either the local time or UTC
534 // into a Time class. 491 // into a Time class.
535 static Time FromUTCExploded(const Exploded& exploded) { 492 static Time FromUTCExploded(const Exploded& exploded) {
536 return FromExploded(false, exploded); 493 return FromExploded(false, exploded);
537 } 494 }
538 static Time FromLocalExploded(const Exploded& exploded) { 495 static Time FromLocalExploded(const Exploded& exploded) {
539 return FromExploded(true, exploded); 496 return FromExploded(true, exploded);
540 } 497 }
541 498
542 // Converts a string representation of time to a Time object. 499 // Converts a string representation of time to a Time object.
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675 // as coarse as ~15.6ms. Otherwise, the resolution should be no worse than one 632 // as coarse as ~15.6ms. Otherwise, the resolution should be no worse than one
676 // microsecond. 633 // microsecond.
677 static TimeTicks Now(); 634 static TimeTicks Now();
678 635
679 // Returns true if the high resolution clock is working on this system and 636 // Returns true if the high resolution clock is working on this system and
680 // Now() will return high resolution values. Note that, on systems where the 637 // Now() will return high resolution values. Note that, on systems where the
681 // high resolution clock works but is deemed inefficient, the low resolution 638 // high resolution clock works but is deemed inefficient, the low resolution
682 // clock will be used instead. 639 // clock will be used instead.
683 static bool IsHighResolution(); 640 static bool IsHighResolution();
684 641
685 #if defined(OS_WIN)
686 // Translates an absolute QPC timestamp into a TimeTicks value. The returned
687 // value has the same origin as Now(). Do NOT attempt to use this if
688 // IsHighResolution() returns false.
689 static TimeTicks FromQPCValue(LONGLONG qpc_value);
690 #endif
691
692 // Get the TimeTick value at the time of the UnixEpoch. This is useful when 642 // Get the TimeTick value at the time of the UnixEpoch. This is useful when
693 // you need to relate the value of TimeTicks to a real time and date. 643 // you need to relate the value of TimeTicks to a real time and date.
694 // Note: Upon first invocation, this function takes a snapshot of the realtime 644 // Note: Upon first invocation, this function takes a snapshot of the realtime
695 // clock to establish a reference point. This function will return the same 645 // clock to establish a reference point. This function will return the same
696 // value for the duration of the application, but will be different in future 646 // value for the duration of the application, but will be different in future
697 // application runs. 647 // application runs.
698 static TimeTicks UnixEpoch(); 648 static TimeTicks UnixEpoch();
699 649
700 // Returns |this| snapped to the next tick, given a |tick_phase| and 650 // Returns |this| snapped to the next tick, given a |tick_phase| and
701 // repeating |tick_interval| in both directions. |this| may be before, 651 // repeating |tick_interval| in both directions. |this| may be before,
702 // after, or equal to the |tick_phase|. 652 // after, or equal to the |tick_phase|.
703 TimeTicks SnappedToNextTick(TimeTicks tick_phase, 653 TimeTicks SnappedToNextTick(TimeTicks tick_phase,
704 TimeDelta tick_interval) const; 654 TimeDelta tick_interval) const;
705 655
706 #if defined(OS_WIN)
707 protected:
708 typedef DWORD (*TickFunctionType)(void);
709 static TickFunctionType SetMockTickFunction(TickFunctionType ticker);
710 #endif
711
712 private: 656 private:
713 friend class time_internal::TimeBase<TimeTicks>; 657 friend class time_internal::TimeBase<TimeTicks>;
714 658
715 // Please use Now() to create a new object. This is for internal use 659 // Please use Now() to create a new object. This is for internal use
716 // and testing. 660 // and testing.
717 explicit TimeTicks(int64 us) : TimeBase(us) { 661 explicit TimeTicks(int64 us) : TimeBase(us) {
718 } 662 }
719 }; 663 };
720 664
721 // For logging use only. 665 // For logging use only.
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801 explicit TraceTicks(int64 us) : TimeBase(us) { 745 explicit TraceTicks(int64 us) : TimeBase(us) {
802 } 746 }
803 }; 747 };
804 748
805 // For logging use only. 749 // For logging use only.
806 BASE_EXPORT std::ostream& operator<<(std::ostream& os, TraceTicks time_ticks); 750 BASE_EXPORT std::ostream& operator<<(std::ostream& os, TraceTicks time_ticks);
807 751
808 } // namespace base 752 } // namespace base
809 753
810 #endif // BASE_TIME_TIME_H_ 754 #endif // BASE_TIME_TIME_H_
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