src/cdrom/macosx/CAGuard.h
author Sam Lantinga <slouken@libsdl.org>
Sat, 28 Jun 2003 17:03:57 +0000
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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/*  
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    Note: This file hasn't been modified so technically we have to keep the disclaimer :-(
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    Copyright:  © Copyright 2002 Apple Computer, Inc. All rights reserved.
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    Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.
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            ("Apple") in consideration of your agreement to the following terms, and your
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            use, installation, modification or redistribution of this Apple software
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            constitutes acceptance of these terms.  If you do not agree with these terms,
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            please do not use, install, modify or redistribute this Apple software.
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            In consideration of your agreement to abide by the following terms, and subject
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            to these terms, Apple grants you a personal, non-exclusive license, under Apple’s
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            copyrights in this original Apple software (the "Apple Software"), to use,
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            reproduce, modify and redistribute the Apple Software, with or without
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            modifications, in source and/or binary forms; provided that if you redistribute
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            the Apple Software in its entirety and without modifications, you must retain
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            this notice and the following text and disclaimers in all such redistributions of
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            the Apple Software.  Neither the name, trademarks, service marks or logos of
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            Apple Computer, Inc. may be used to endorse or promote products derived from the
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            Apple Software without specific prior written permission from Apple.  Except as
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            expressly stated in this notice, no other rights or licenses, express or implied,
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            are granted by Apple herein, including but not limited to any patent rights that
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            may be infringed by your derivative works or by other works in which the Apple
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            Software may be incorporated.
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            The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO
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            WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
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            WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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            PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
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            COMBINATION WITH YOUR PRODUCTS.
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            IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
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            CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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            GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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            ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
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            OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
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            (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
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            ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*=============================================================================
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    CAGuard.h
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=============================================================================*/
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#if !defined(__CAGuard_h__)
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#define __CAGuard_h__
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//=============================================================================
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//  Includes
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//=============================================================================
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#include <CoreAudio/CoreAudioTypes.h>
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#include <pthread.h>
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//=============================================================================
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//  CAGuard
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//
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//  This is your typical mutex with signalling implemented via pthreads.
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//  Lock() will return true if and only if the guard is locked on that call.
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//  A thread that already has the guard will receive 'false' if it locks it
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//  again. Use of the stack-based CAGuard::Locker class is highly recommended
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//  to properly manage the recursive nesting. The Wait calls with timeouts
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//  will return true if and only if the timeout period expired. They will
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//  return false if they receive notification any other way.
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//=============================================================================
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class   CAGuard
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{
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//  Construction/Destruction
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public:
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                    CAGuard();
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    virtual         ~CAGuard();
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//  Actions
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public:
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    virtual bool    Lock();
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    virtual void    Unlock();
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    virtual bool    Try(bool& outWasLocked);    // returns true if lock is free, false if not
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    virtual void    Wait();
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    virtual void    Notify();
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//  Implementation
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protected:
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    pthread_mutex_t mMutex;
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    pthread_cond_t  mCondVar;
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    pthread_t       mOwner;
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//  Helper class to manage taking and releasing recursively
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public:
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    class           Locker
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    {
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    //  Construction/Destruction
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    public:
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                    Locker(CAGuard& inGuard) : mGuard(inGuard), mNeedsRelease(false) { mNeedsRelease = mGuard.Lock(); }
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                    ~Locker() { if(mNeedsRelease) { mGuard.Unlock(); } }
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    private:
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                    Locker(const Locker&);
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        Locker&     operator=(const Locker&);
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    //  Actions
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    public:
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        void        Wait() { mGuard.Wait(); }
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        void        Notify() { mGuard.Notify(); }
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    //  Implementation
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    private:
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        CAGuard&    mGuard;
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        bool        mNeedsRelease;
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    };
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};
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#endif