28e2075280
trunk/talk git-svn-id: http://webrtc.googlecode.com/svn/trunk@4318 4adac7df-926f-26a2-2b94-8c16560cd09d
77 lines
2.9 KiB
C++
77 lines
2.9 KiB
C++
/*
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* libjingle
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* Copyright 2008, Google Inc.
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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 met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TALK_BASE_TIMING_H_
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#define TALK_BASE_TIMING_H_
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#if defined(WIN32)
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#include "talk/base/win32.h"
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#endif
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namespace talk_base {
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class Timing {
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public:
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Timing();
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virtual ~Timing();
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// WallTimeNow() returns the current wall-clock time in seconds,
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// within 10 milliseconds resolution.
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virtual double WallTimeNow();
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// TimerNow() is like WallTimeNow(), but is monotonically
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// increasing. It returns seconds in resolution of 10 microseconds
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// or better. Although timer and wall-clock time have the same
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// timing unit, they do not necessarily correlate because wall-clock
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// time may be adjusted backwards, hence not monotonic.
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// Made virtual so we can make a fake one.
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virtual double TimerNow();
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// BusyWait() exhausts CPU as long as the time elapsed is less than
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// the specified interval in seconds. Returns the actual waiting
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// time based on TimerNow() measurement.
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double BusyWait(double period);
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// IdleWait() relinquishes control of CPU for specified period in
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// seconds. It uses highest resolution sleep mechanism as possible,
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// but does not otherwise guarantee the accuracy. Returns the
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// actual waiting time based on TimerNow() measurement.
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//
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// This function is not re-entrant for an object. Create a fresh
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// Timing object for each thread.
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double IdleWait(double period);
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private:
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#if defined(WIN32)
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HANDLE timer_handle_;
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#endif
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};
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} // namespace talk_base
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#endif // TALK_BASE_TIMING_H_
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