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| 1 /* | 1 /* |
| 2 * Copyright (C) 2006 Apple Computer, Inc. All rights reserved. | 2 * Copyright (C) 2006 Apple Computer, Inc. All rights reserved. |
| 3 * Copyright (C) 2008 Google Inc. All rights reserved. | 3 * Copyright (C) 2008 Google Inc. All rights reserved. |
| 4 * | 4 * |
| 5 * Redistribution and use in source and binary forms, with or without | 5 * Redistribution and use in source and binary forms, with or without |
| 6 * modification, are permitted provided that the following conditions are | 6 * modification, are permitted provided that the following conditions are |
| 7 * met: | 7 * met: |
| 8 * | 8 * |
| 9 * * Redistributions of source code must retain the above copyright | 9 * * Redistributions of source code must retain the above copyright |
| 10 * notice, this list of conditions and the following disclaimer. | 10 * notice, this list of conditions and the following disclaimer. |
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| 39 // Returns the current UTC time in seconds, counted from January 1, 1970. | 39 // Returns the current UTC time in seconds, counted from January 1, 1970. |
| 40 // Precision varies depending on platform but is usually as good or better | 40 // Precision varies depending on platform but is usually as good or better |
| 41 // than a millisecond. | 41 // than a millisecond. |
| 42 WTF_EXPORT double currentTime(); | 42 WTF_EXPORT double currentTime(); |
| 43 | 43 |
| 44 // Same thing, in milliseconds. | 44 // Same thing, in milliseconds. |
| 45 inline double currentTimeMS() { | 45 inline double currentTimeMS() { |
| 46 return currentTime() * 1000.0; | 46 return currentTime() * 1000.0; |
| 47 } | 47 } |
| 48 | 48 |
| 49 // Provides a monotonically increasing time in seconds since an arbitrary point
in the past. | 49 // Provides a monotonically increasing time in seconds since an arbitrary point |
| 50 // On unsupported platforms, this function only guarantees the result will be no
n-decreasing. | 50 // in the past. On unsupported platforms, this function only guarantees the |
| 51 // result will be non-decreasing. |
| 51 WTF_EXPORT double monotonicallyIncreasingTime(); | 52 WTF_EXPORT double monotonicallyIncreasingTime(); |
| 52 | 53 |
| 53 // Same thing, in milliseconds. | 54 // Same thing, in milliseconds. |
| 54 inline double monotonicallyIncreasingTimeMS() { | 55 inline double monotonicallyIncreasingTimeMS() { |
| 55 return monotonicallyIncreasingTime() * 1000.0; | 56 return monotonicallyIncreasingTime() * 1000.0; |
| 56 } | 57 } |
| 57 | 58 |
| 58 using TimeFunction = double (*)(); | 59 using TimeFunction = double (*)(); |
| 59 | 60 |
| 60 // Make all the time functions (currentTime(), monotonicallyIncreasingTime(), sy
stemTraceTime()) return the result | 61 // Make all the time functions (currentTime(), monotonicallyIncreasingTime(), |
| 61 // of the supplied function. Returns the pointer to the old time function. For b
oth setting and getting, nullptr means | 62 // systemTraceTime()) return the result of the supplied function. Returns the |
| 62 // using the default timing function returning the actual time. | 63 // pointer to the old time function. For both setting and getting, nullptr |
| 64 // means using the default timing function returning the actual time. |
| 63 WTF_EXPORT TimeFunction setTimeFunctionsForTesting(TimeFunction); | 65 WTF_EXPORT TimeFunction setTimeFunctionsForTesting(TimeFunction); |
| 64 | 66 |
| 65 } // namespace WTF | 67 } // namespace WTF |
| 66 | 68 |
| 67 using WTF::currentTime; | 69 using WTF::currentTime; |
| 68 using WTF::currentTimeMS; | 70 using WTF::currentTimeMS; |
| 69 using WTF::monotonicallyIncreasingTime; | 71 using WTF::monotonicallyIncreasingTime; |
| 70 using WTF::monotonicallyIncreasingTimeMS; | 72 using WTF::monotonicallyIncreasingTimeMS; |
| 71 using WTF::TimeFunction; | 73 using WTF::TimeFunction; |
| 72 using WTF::setTimeFunctionsForTesting; | 74 using WTF::setTimeFunctionsForTesting; |
| 73 | 75 |
| 74 #endif // CurrentTime_h | 76 #endif // CurrentTime_h |
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