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63 lines
2.4 KiB
C++
63 lines
2.4 KiB
C++
/*
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* Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
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* Copyright (C) 2008 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SKY_ENGINE_WTF_CURRENTTIME_H_
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#define SKY_ENGINE_WTF_CURRENTTIME_H_
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#include "sky/engine/wtf/WTFExport.h"
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namespace WTF {
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// Returns the current UTC time in seconds, counted from January 1, 1970.
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// Precision varies depending on platform but is usually as good or better
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// than a millisecond.
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WTF_EXPORT double currentTime();
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// Same thing, in milliseconds.
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inline double currentTimeMS()
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{
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return currentTime() * 1000.0;
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}
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// Provides a monotonically increasing time in seconds since an arbitrary point in the past.
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// On unsupported platforms, this function only guarantees the result will be non-decreasing.
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WTF_EXPORT double monotonicallyIncreasingTime();
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typedef double(*TimeFunction)(void);
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} // namespace WTF
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using WTF::currentTime;
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using WTF::currentTimeMS;
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using WTF::monotonicallyIncreasingTime;
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#endif // SKY_ENGINE_WTF_CURRENTTIME_H_
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