src/cdrom/macosx/CAGuard.cpp
author Sam Lantinga <slouken@libsdl.org>
Sat, 28 Jun 2003 17:03:57 +0000
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child 768 de1b2c3063b9
permissions -rw-r--r--
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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.cp
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=============================================================================*/
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//=============================================================================
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//  Includes
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//=============================================================================
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#include <stdio.h>
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#define NDEBUG 1
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#include <assert.h>
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#include "CAGuard.h"
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//#warning      Need a try-based Locker too
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//=============================================================================
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//  CAGuard
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//=============================================================================
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CAGuard::CAGuard()
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{
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    OSStatus theError = pthread_mutex_init(&mMutex, NULL);
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    assert(theError == 0);
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    theError = pthread_cond_init(&mCondVar, NULL);
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    assert(theError == 0);
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    mOwner = 0;
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}
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CAGuard::~CAGuard()
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{
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    pthread_mutex_destroy(&mMutex);
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    pthread_cond_destroy(&mCondVar);
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}
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bool    CAGuard::Lock()
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{
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    bool theAnswer = false;
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    if(pthread_self() != mOwner)
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    {
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        OSStatus theError = pthread_mutex_lock(&mMutex);
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        assert(theError == 0);
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        mOwner = pthread_self();
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        theAnswer = true;
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    }
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    return theAnswer;
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}
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void    CAGuard::Unlock()
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{
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    assert(pthread_self() == mOwner);
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    mOwner = 0;
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    OSStatus theError = pthread_mutex_unlock(&mMutex);
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    assert(theError == 0);
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}
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bool    CAGuard::Try (bool& outWasLocked)
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{
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    bool theAnswer = false;
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    outWasLocked = false;
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    if (pthread_self() == mOwner) {
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        theAnswer = true;
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        outWasLocked = false;
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    } else {
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        OSStatus theError = pthread_mutex_trylock(&mMutex);
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        if (theError == 0) {
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            mOwner = pthread_self();
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            theAnswer = true;
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            outWasLocked = true;
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        }
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    }
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    return theAnswer;
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}
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void    CAGuard::Wait()
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{
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    assert(pthread_self() == mOwner);
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    mOwner = 0;
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    OSStatus theError = pthread_cond_wait(&mCondVar, &mMutex);
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    assert(theError == 0);
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    mOwner = pthread_self();
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}
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void    CAGuard::Notify()
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{
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    OSStatus theError = pthread_cond_signal(&mCondVar);
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    assert(theError == 0);
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}