/*+
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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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+
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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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+
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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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+
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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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+
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    Sam Lantinga+
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    slouken@libsdl.org+
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*/+
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#include "SDL_config.h"+
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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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    +
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    Copyright:  � Copyright 2002 Apple Computer, Inc. All rights reserved.+
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+
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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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+
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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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+
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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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+
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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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+
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/*=============================================================================+
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    Includes+
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  =============================================================================*/+
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+
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/*+
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#include <stdio.h>+
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#include <stdlib.h>+
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#include <string.h>+
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*/+
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#include "SDL_stdinc.h"+
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+
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/*#define NDEBUG 1*/+
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/*+
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#include <assert.h>+
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*/+
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#define assert(X)+
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+
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+
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#include "SDLOSXCAGuard.h"+
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+
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/*#warning      Need a try-based Locker too*/+
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/*=============================================================================+
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    SDLOSXCAGuard+
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  =============================================================================*/+
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+
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static int SDLOSXCAGuard_Lock(SDLOSXCAGuard *cag)+
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{+
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    int theAnswer = 0;+
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    +
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    if(pthread_self() != cag->mOwner)+
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    {+
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        OSStatus theError = pthread_mutex_lock(&cag->mMutex);+
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        (void)theError;+
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        assert(theError == 0);+
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        cag->mOwner = pthread_self();+
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        theAnswer = 1;+
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    }+
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+
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    return theAnswer;+
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}+
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+
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static void    SDLOSXCAGuard_Unlock(SDLOSXCAGuard *cag)+
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{+
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    OSStatus theError;+
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    assert(pthread_self() == cag->mOwner);+
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+
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    cag->mOwner = 0;+
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    theError = pthread_mutex_unlock(&cag->mMutex);+
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    (void)theError;+
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    assert(theError == 0);+
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}+
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+
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static int SDLOSXCAGuard_Try (SDLOSXCAGuard *cag, int *outWasLocked)+
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{+
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    int theAnswer = 0;+
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    *outWasLocked = 0;+
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    +
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    if (pthread_self() == cag->mOwner) {+
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        theAnswer = 1;+
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        *outWasLocked = 0;+
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    } else {+
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        OSStatus theError = pthread_mutex_trylock(&cag->mMutex);+
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        if (theError == 0) {+
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            cag->mOwner = pthread_self();+
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            theAnswer = 1;+
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            *outWasLocked = 1;+
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        }+
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    }+
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    +
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    return theAnswer;+
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}+
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+
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static void    SDLOSXCAGuard_Wait(SDLOSXCAGuard *cag)+
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{+
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    OSStatus theError;+
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    assert(pthread_self() == cag->mOwner);+
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+
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    cag->mOwner = 0;+
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+
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    theError = pthread_cond_wait(&cag->mCondVar, &cag->mMutex);+
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    (void)theError;+
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    assert(theError == 0);+
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    cag->mOwner = pthread_self();+
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}+
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+
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static void    SDLOSXCAGuard_Notify(SDLOSXCAGuard *cag)+
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{+
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    OSStatus theError = pthread_cond_signal(&cag->mCondVar);+
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    (void)theError;+
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    assert(theError == 0);+
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}+
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+
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+
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SDLOSXCAGuard *new_SDLOSXCAGuard(void)+
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{+
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    OSStatus theError;+
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    SDLOSXCAGuard *cag = (SDLOSXCAGuard *) SDL_malloc(sizeof (SDLOSXCAGuard));+
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    if (cag == NULL)+
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        return NULL;+
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    SDL_memset(cag, '\0', sizeof (*cag));+
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+
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    #define SET_SDLOSXCAGUARD_METHOD(m) cag->m = SDLOSXCAGuard_##m+
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    SET_SDLOSXCAGUARD_METHOD(Lock);+
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    SET_SDLOSXCAGUARD_METHOD(Unlock);+
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    SET_SDLOSXCAGUARD_METHOD(Try);+
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    SET_SDLOSXCAGUARD_METHOD(Wait);+
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    SET_SDLOSXCAGUARD_METHOD(Notify);+
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    #undef SET_SDLOSXCAGUARD_METHOD+
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+
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    theError = pthread_mutex_init(&cag->mMutex, NULL);+
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    (void)theError;+
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    assert(theError == 0);+
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    +
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    theError = pthread_cond_init(&cag->mCondVar, NULL);+
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    (void)theError;+
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    assert(theError == 0);+
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    +
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    cag->mOwner = 0;+
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    return cag;+
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}+
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+
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void delete_SDLOSXCAGuard(SDLOSXCAGuard *cag)+
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{+
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    if (cag != NULL)+
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    {+
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        pthread_mutex_destroy(&cag->mMutex);+
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        pthread_cond_destroy(&cag->mCondVar);+
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        SDL_free(cag);+
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    }+
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}+
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+
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