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