diff options
Diffstat (limited to 'distrib/sdl-1.2.15/src/cdrom/macosx/SDLOSXCAGuard.c')
| -rw-r--r-- | distrib/sdl-1.2.15/src/cdrom/macosx/SDLOSXCAGuard.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/cdrom/macosx/SDLOSXCAGuard.c b/distrib/sdl-1.2.15/src/cdrom/macosx/SDLOSXCAGuard.c new file mode 100644 index 0000000..e8caf1b --- /dev/null +++ b/distrib/sdl-1.2.15/src/cdrom/macosx/SDLOSXCAGuard.c @@ -0,0 +1,199 @@ +/* + SDL - Simple DirectMedia Layer + Copyright (C) 1997-2012 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 +*/ +#include "SDL_config.h" + +/* + 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> +*/ +#include "SDL_stdinc.h" + +/*#define NDEBUG 1*/ +/* +#include <assert.h> +*/ +#define assert(X) + + +#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); + (void)theError; + assert(theError == 0); + cag->mOwner = pthread_self(); + theAnswer = 1; + } + + return theAnswer; +} + +static void SDLOSXCAGuard_Unlock(SDLOSXCAGuard *cag) +{ + OSStatus theError; + assert(pthread_self() == cag->mOwner); + + cag->mOwner = 0; + theError = pthread_mutex_unlock(&cag->mMutex); + (void)theError; + 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) +{ + OSStatus theError; + assert(pthread_self() == cag->mOwner); + + cag->mOwner = 0; + + theError = pthread_cond_wait(&cag->mCondVar, &cag->mMutex); + (void)theError; + assert(theError == 0); + cag->mOwner = pthread_self(); +} + +static void SDLOSXCAGuard_Notify(SDLOSXCAGuard *cag) +{ + OSStatus theError = pthread_cond_signal(&cag->mCondVar); + (void)theError; + assert(theError == 0); +} + + +SDLOSXCAGuard *new_SDLOSXCAGuard(void) +{ + OSStatus theError; + SDLOSXCAGuard *cag = (SDLOSXCAGuard *) SDL_malloc(sizeof (SDLOSXCAGuard)); + if (cag == NULL) + return NULL; + SDL_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 + + theError = pthread_mutex_init(&cag->mMutex, NULL); + (void)theError; + assert(theError == 0); + + theError = pthread_cond_init(&cag->mCondVar, NULL); + (void)theError; + 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); + SDL_free(cag); + } +} + |