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103 lines
3.9 KiB
C++
103 lines
3.9 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of Beast: https://github.com/vinniefalco/Beast
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Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
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Portions of this file are from JUCE.
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Copyright (c) 2013 - Raw Material Software Ltd.
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Please visit http://www.juce.com
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef BEAST_HIGHRESOLUTIONTIMER_H_INCLUDED
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#define BEAST_HIGHRESOLUTIONTIMER_H_INCLUDED
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/**
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A high-resolution periodic timer.
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This provides accurately-timed regular callbacks. Unlike the normal Timer
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class, this one uses a dedicated thread, not the message thread, so is
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far more stable and precise.
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You should only use this class in situations where you really need accuracy,
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because unlike the normal Timer class, which is very lightweight and cheap
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to start/stop, the HighResolutionTimer will use far more resources, and
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starting/stopping it may involve launching and killing threads.
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@see Timer
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*/
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class BEAST_API HighResolutionTimer : LeakChecked <HighResolutionTimer>, public Uncopyable
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{
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protected:
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/** Creates a HighResolutionTimer.
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When created, the timer is stopped, so use startTimer() to get it going.
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*/
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HighResolutionTimer();
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public:
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/** Destructor. */
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virtual ~HighResolutionTimer();
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//==============================================================================
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/** The user-defined callback routine that actually gets called periodically.
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This will be called on a dedicated timer thread, so make sure your
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implementation is thread-safe!
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It's perfectly ok to call startTimer() or stopTimer() from within this
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callback to change the subsequent intervals.
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*/
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virtual void hiResTimerCallback() = 0;
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//==============================================================================
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/** Starts the timer and sets the length of interval required.
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If the timer is already started, this will reset its counter, so the
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time between calling this method and the next timer callback will not be
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less than the interval length passed in.
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@param intervalInMilliseconds the interval to use (any values less than 1 will be
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rounded up to 1)
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*/
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void startTimer (int intervalInMilliseconds);
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/** Stops the timer.
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This method may block while it waits for pending callbacks to complete. Once it
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returns, no more callbacks will be made. If it is called from the timer's own thread,
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it will cancel the timer after the current callback returns.
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*/
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void stopTimer();
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/** Checks if the timer has been started.
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@returns true if the timer is running.
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*/
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bool isTimerRunning() const noexcept;
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/** Returns the timer's interval.
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@returns the timer's interval in milliseconds if it's running, or 0 if it's not.
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*/
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int getTimerInterval() const noexcept;
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private:
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struct Pimpl;
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friend struct Pimpl;
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friend class ScopedPointer<Pimpl>;
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ScopedPointer<Pimpl> pimpl;
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};
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#endif // BEAST_HIGHRESOLUTIONTIMER_H_INCLUDED
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