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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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300 // Warning: Be careful when writing code that performs math on time values, | 300 // Warning: Be careful when writing code that performs math on time values, |
301 // since it's possible to produce a valid "zero" result that should not be | 301 // since it's possible to produce a valid "zero" result that should not be |
302 // interpreted as a "null" value. | 302 // interpreted as a "null" value. |
303 bool is_null() const { | 303 bool is_null() const { |
304 return us_ == 0; | 304 return us_ == 0; |
305 } | 305 } |
306 | 306 |
307 // Returns true if this object represents the maximum time. | 307 // Returns true if this object represents the maximum time. |
308 bool is_max() const { return us_ == std::numeric_limits<int64_t>::max(); } | 308 bool is_max() const { return us_ == std::numeric_limits<int64_t>::max(); } |
309 | 309 |
310 // Returns the maximum time, which should be greater than any reasonable time | |
311 // with which we might compare it. | |
312 static TimeClass Max() { | |
313 return TimeClass(std::numeric_limits<int64_t>::max()); | |
314 } | |
majidvp
2016/05/16 12:49:50
Pulled up from Time so that it is applicate to all
| |
315 | |
310 // For serializing only. Use FromInternalValue() to reconstitute. Please don't | 316 // For serializing only. Use FromInternalValue() to reconstitute. Please don't |
311 // use this and do arithmetic on it, as it is more error prone than using the | 317 // use this and do arithmetic on it, as it is more error prone than using the |
312 // provided operators. | 318 // provided operators. |
313 int64_t ToInternalValue() const { return us_; } | 319 int64_t ToInternalValue() const { return us_; } |
314 | 320 |
315 TimeClass& operator=(TimeClass other) { | 321 TimeClass& operator=(TimeClass other) { |
316 us_ = other.us_; | 322 us_ = other.us_; |
317 return *(static_cast<TimeClass*>(this)); | 323 return *(static_cast<TimeClass*>(this)); |
318 } | 324 } |
319 | 325 |
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427 } | 433 } |
428 | 434 |
429 // Returns the time for epoch in Unix-like system (Jan 1, 1970). | 435 // Returns the time for epoch in Unix-like system (Jan 1, 1970). |
430 static Time UnixEpoch(); | 436 static Time UnixEpoch(); |
431 | 437 |
432 // Returns the current time. Watch out, the system might adjust its clock | 438 // Returns the current time. Watch out, the system might adjust its clock |
433 // in which case time will actually go backwards. We don't guarantee that | 439 // in which case time will actually go backwards. We don't guarantee that |
434 // times are increasing, or that two calls to Now() won't be the same. | 440 // times are increasing, or that two calls to Now() won't be the same. |
435 static Time Now(); | 441 static Time Now(); |
436 | 442 |
437 // Returns the maximum time, which should be greater than any reasonable time | |
438 // with which we might compare it. | |
439 static Time Max(); | |
440 | |
441 // Returns the current time. Same as Now() except that this function always | 443 // Returns the current time. Same as Now() except that this function always |
442 // uses system time so that there are no discrepancies between the returned | 444 // uses system time so that there are no discrepancies between the returned |
443 // time and system time even on virtual environments including our test bot. | 445 // time and system time even on virtual environments including our test bot. |
444 // For timing sensitive unittests, this function should be used. | 446 // For timing sensitive unittests, this function should be used. |
445 static Time NowFromSystemTime(); | 447 static Time NowFromSystemTime(); |
446 | 448 |
447 // Converts to/from time_t in UTC and a Time class. | 449 // Converts to/from time_t in UTC and a Time class. |
448 // TODO(brettw) this should be removed once everybody starts using the |Time| | 450 // TODO(brettw) this should be removed once everybody starts using the |Time| |
449 // class. | 451 // class. |
450 static Time FromTimeT(time_t tt); | 452 static Time FromTimeT(time_t tt); |
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776 static void WaitUntilInitializedWin(); | 778 static void WaitUntilInitializedWin(); |
777 #endif | 779 #endif |
778 }; | 780 }; |
779 | 781 |
780 // For logging use only. | 782 // For logging use only. |
781 BASE_EXPORT std::ostream& operator<<(std::ostream& os, ThreadTicks time_ticks); | 783 BASE_EXPORT std::ostream& operator<<(std::ostream& os, ThreadTicks time_ticks); |
782 | 784 |
783 } // namespace base | 785 } // namespace base |
784 | 786 |
785 #endif // BASE_TIME_TIME_H_ | 787 #endif // BASE_TIME_TIME_H_ |
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