--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/cdrom/macosx/SDLOSXCAGuard.c	Thu Sep 22 08:48:16 2005 +0000
@@ -0,0 +1,182 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public
+    License along with this library; if not, write to the Free
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+/*  
+    Note: This file hasn't been modified so technically we have to keep the disclaimer :-(
+    
+    Copyright:  © Copyright 2002 Apple Computer, Inc. All rights reserved.
+
+    Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.
+            ("Apple") in consideration of your agreement to the following terms, and your
+            use, installation, modification or redistribution of this Apple software
+            constitutes acceptance of these terms.  If you do not agree with these terms,
+            please do not use, install, modify or redistribute this Apple software.
+
+            In consideration of your agreement to abide by the following terms, and subject
+            to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs
+            copyrights in this original Apple software (the "Apple Software"), to use,
+            reproduce, modify and redistribute the Apple Software, with or without
+            modifications, in source and/or binary forms; provided that if you redistribute
+            the Apple Software in its entirety and without modifications, you must retain
+            this notice and the following text and disclaimers in all such redistributions of
+            the Apple Software.  Neither the name, trademarks, service marks or logos of
+            Apple Computer, Inc. may be used to endorse or promote products derived from the
+            Apple Software without specific prior written permission from Apple.  Except as
+            expressly stated in this notice, no other rights or licenses, express or implied,
+            are granted by Apple herein, including but not limited to any patent rights that
+            may be infringed by your derivative works or by other works in which the Apple
+            Software may be incorporated.
+
+            The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO
+            WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
+            WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+            PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
+            COMBINATION WITH YOUR PRODUCTS.
+
+            IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
+            CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+            GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+            ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
+            OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
+            (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
+            ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+/*=============================================================================
+    CAGuard.cp
+
+=============================================================================*/
+
+//=============================================================================
+//  Includes
+//=============================================================================
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+//#define NDEBUG 1
+#include <assert.h>
+
+
+#include "SDLOSXCAGuard.h"
+
+//#warning      Need a try-based Locker too
+//=============================================================================
+//  SDLOSXCAGuard
+//=============================================================================
+
+static int SDLOSXCAGuard_Lock(SDLOSXCAGuard *cag)
+{
+    int theAnswer = 0;
+    
+    if(pthread_self() != cag->mOwner)
+    {
+        OSStatus theError = pthread_mutex_lock(&cag->mMutex);
+        assert(theError == 0);
+        cag->mOwner = pthread_self();
+        theAnswer = 1;
+    }
+
+    return theAnswer;
+}
+
+static void    SDLOSXCAGuard_Unlock(SDLOSXCAGuard *cag)
+{
+    assert(pthread_self() == cag->mOwner);
+
+    cag->mOwner = 0;
+    OSStatus theError = pthread_mutex_unlock(&cag->mMutex);
+    assert(theError == 0);
+}
+
+static int SDLOSXCAGuard_Try (SDLOSXCAGuard *cag, int *outWasLocked)
+{
+    int theAnswer = 0;
+    *outWasLocked = 0;
+    
+    if (pthread_self() == cag->mOwner) {
+        theAnswer = 1;
+        *outWasLocked = 0;
+    } else {
+        OSStatus theError = pthread_mutex_trylock(&cag->mMutex);
+        if (theError == 0) {
+            cag->mOwner = pthread_self();
+            theAnswer = 1;
+            *outWasLocked = 1;
+        }
+    }
+    
+    return theAnswer;
+}
+
+static void    SDLOSXCAGuard_Wait(SDLOSXCAGuard *cag)
+{
+    assert(pthread_self() == cag->mOwner);
+
+    cag->mOwner = 0;
+
+    OSStatus theError = pthread_cond_wait(&cag->mCondVar, &cag->mMutex);
+    assert(theError == 0);
+    cag->mOwner = pthread_self();
+}
+
+static void    SDLOSXCAGuard_Notify(SDLOSXCAGuard *cag)
+{
+    OSStatus theError = pthread_cond_signal(&cag->mCondVar);
+    assert(theError == 0);
+}
+
+
+SDLOSXCAGuard *new_SDLOSXCAGuard(void)
+{
+    SDLOSXCAGuard *cag = (SDLOSXCAGuard *) malloc(sizeof (SDLOSXCAGuard));
+    if (cag == NULL)
+        return NULL;
+    memset(cag, '\0', sizeof (*cag));
+
+    #define SET_SDLOSXCAGUARD_METHOD(m) cag->m = SDLOSXCAGuard_##m
+    SET_SDLOSXCAGUARD_METHOD(Lock);
+    SET_SDLOSXCAGUARD_METHOD(Unlock);
+    SET_SDLOSXCAGUARD_METHOD(Try);
+    SET_SDLOSXCAGUARD_METHOD(Wait);
+    SET_SDLOSXCAGUARD_METHOD(Notify);
+    #undef SET_SDLOSXCAGUARD_METHOD
+
+    OSStatus theError = pthread_mutex_init(&cag->mMutex, NULL);
+    assert(theError == 0);
+    
+    theError = pthread_cond_init(&cag->mCondVar, NULL);
+    assert(theError == 0);
+    
+    cag->mOwner = 0;
+    return cag;
+}
+
+void delete_SDLOSXCAGuard(SDLOSXCAGuard *cag)
+{
+    if (cag != NULL)
+    {
+        pthread_mutex_destroy(&cag->mMutex);
+        pthread_cond_destroy(&cag->mCondVar);
+        free(cag);
+    }
+}
+