Jean-Baptiste Queru | 46e568c | 2009-10-27 09:08:42 -0700 | [diff] [blame] | 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga |
| 4 | |
| 5 | This library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Library General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2 of the License, or (at your option) any later version. |
| 9 | |
| 10 | This library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Library General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Library General Public |
| 16 | License along with this library; if not, write to the Free |
| 17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | |
| 19 | Sam Lantinga |
| 20 | slouken@libsdl.org |
| 21 | */ |
| 22 | #include "SDL_config.h" |
| 23 | |
| 24 | /* |
| 25 | Note: This file hasn't been modified so technically we have to keep the disclaimer :-( |
| 26 | |
| 27 | Copyright: © Copyright 2002 Apple Computer, Inc. All rights reserved. |
| 28 | |
| 29 | Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc. |
| 30 | ("Apple") in consideration of your agreement to the following terms, and your |
| 31 | use, installation, modification or redistribution of this Apple software |
| 32 | constitutes acceptance of these terms. If you do not agree with these terms, |
| 33 | please do not use, install, modify or redistribute this Apple software. |
| 34 | |
| 35 | In consideration of your agreement to abide by the following terms, and subject |
| 36 | to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs |
| 37 | copyrights in this original Apple software (the "Apple Software"), to use, |
| 38 | reproduce, modify and redistribute the Apple Software, with or without |
| 39 | modifications, in source and/or binary forms; provided that if you redistribute |
| 40 | the Apple Software in its entirety and without modifications, you must retain |
| 41 | this notice and the following text and disclaimers in all such redistributions of |
| 42 | the Apple Software. Neither the name, trademarks, service marks or logos of |
| 43 | Apple Computer, Inc. may be used to endorse or promote products derived from the |
| 44 | Apple Software without specific prior written permission from Apple. Except as |
| 45 | expressly stated in this notice, no other rights or licenses, express or implied, |
| 46 | are granted by Apple herein, including but not limited to any patent rights that |
| 47 | may be infringed by your derivative works or by other works in which the Apple |
| 48 | Software may be incorporated. |
| 49 | |
| 50 | The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO |
| 51 | WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED |
| 52 | WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 53 | PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN |
| 54 | COMBINATION WITH YOUR PRODUCTS. |
| 55 | |
| 56 | IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR |
| 57 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
| 58 | GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 59 | ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION |
| 60 | OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT |
| 61 | (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN |
| 62 | ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 63 | */ |
| 64 | /*============================================================================= |
| 65 | CAGuard.cp |
| 66 | |
| 67 | =============================================================================*/ |
| 68 | |
| 69 | /*============================================================================= |
| 70 | Includes |
| 71 | =============================================================================*/ |
| 72 | |
| 73 | /* |
| 74 | #include <stdio.h> |
| 75 | #include <stdlib.h> |
| 76 | #include <string.h> |
| 77 | */ |
| 78 | #include "SDL_stdinc.h" |
| 79 | |
| 80 | /*#define NDEBUG 1*/ |
| 81 | /* |
| 82 | #include <assert.h> |
| 83 | */ |
| 84 | #define assert(X) |
| 85 | |
| 86 | |
| 87 | #include "SDLOSXCAGuard.h" |
| 88 | |
| 89 | /*#warning Need a try-based Locker too*/ |
| 90 | /*============================================================================= |
| 91 | SDLOSXCAGuard |
| 92 | =============================================================================*/ |
| 93 | |
| 94 | static int SDLOSXCAGuard_Lock(SDLOSXCAGuard *cag) |
| 95 | { |
| 96 | int theAnswer = 0; |
| 97 | |
| 98 | if(pthread_self() != cag->mOwner) |
| 99 | { |
| 100 | OSStatus theError = pthread_mutex_lock(&cag->mMutex); |
| 101 | (void)theError; |
| 102 | assert(theError == 0); |
| 103 | cag->mOwner = pthread_self(); |
| 104 | theAnswer = 1; |
| 105 | } |
| 106 | |
| 107 | return theAnswer; |
| 108 | } |
| 109 | |
| 110 | static void SDLOSXCAGuard_Unlock(SDLOSXCAGuard *cag) |
| 111 | { |
| 112 | OSStatus theError; |
| 113 | assert(pthread_self() == cag->mOwner); |
| 114 | |
| 115 | cag->mOwner = 0; |
| 116 | theError = pthread_mutex_unlock(&cag->mMutex); |
| 117 | (void)theError; |
| 118 | assert(theError == 0); |
| 119 | } |
| 120 | |
| 121 | static int SDLOSXCAGuard_Try (SDLOSXCAGuard *cag, int *outWasLocked) |
| 122 | { |
| 123 | int theAnswer = 0; |
| 124 | *outWasLocked = 0; |
| 125 | |
| 126 | if (pthread_self() == cag->mOwner) { |
| 127 | theAnswer = 1; |
| 128 | *outWasLocked = 0; |
| 129 | } else { |
| 130 | OSStatus theError = pthread_mutex_trylock(&cag->mMutex); |
| 131 | if (theError == 0) { |
| 132 | cag->mOwner = pthread_self(); |
| 133 | theAnswer = 1; |
| 134 | *outWasLocked = 1; |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | return theAnswer; |
| 139 | } |
| 140 | |
| 141 | static void SDLOSXCAGuard_Wait(SDLOSXCAGuard *cag) |
| 142 | { |
| 143 | OSStatus theError; |
| 144 | assert(pthread_self() == cag->mOwner); |
| 145 | |
| 146 | cag->mOwner = 0; |
| 147 | |
| 148 | theError = pthread_cond_wait(&cag->mCondVar, &cag->mMutex); |
| 149 | (void)theError; |
| 150 | assert(theError == 0); |
| 151 | cag->mOwner = pthread_self(); |
| 152 | } |
| 153 | |
| 154 | static void SDLOSXCAGuard_Notify(SDLOSXCAGuard *cag) |
| 155 | { |
| 156 | OSStatus theError = pthread_cond_signal(&cag->mCondVar); |
| 157 | (void)theError; |
| 158 | assert(theError == 0); |
| 159 | } |
| 160 | |
| 161 | |
| 162 | SDLOSXCAGuard *new_SDLOSXCAGuard(void) |
| 163 | { |
| 164 | OSStatus theError; |
| 165 | SDLOSXCAGuard *cag = (SDLOSXCAGuard *) SDL_malloc(sizeof (SDLOSXCAGuard)); |
| 166 | if (cag == NULL) |
| 167 | return NULL; |
| 168 | SDL_memset(cag, '\0', sizeof (*cag)); |
| 169 | |
| 170 | #define SET_SDLOSXCAGUARD_METHOD(m) cag->m = SDLOSXCAGuard_##m |
| 171 | SET_SDLOSXCAGUARD_METHOD(Lock); |
| 172 | SET_SDLOSXCAGUARD_METHOD(Unlock); |
| 173 | SET_SDLOSXCAGUARD_METHOD(Try); |
| 174 | SET_SDLOSXCAGUARD_METHOD(Wait); |
| 175 | SET_SDLOSXCAGUARD_METHOD(Notify); |
| 176 | #undef SET_SDLOSXCAGUARD_METHOD |
| 177 | |
| 178 | theError = pthread_mutex_init(&cag->mMutex, NULL); |
| 179 | (void)theError; |
| 180 | assert(theError == 0); |
| 181 | |
| 182 | theError = pthread_cond_init(&cag->mCondVar, NULL); |
| 183 | (void)theError; |
| 184 | assert(theError == 0); |
| 185 | |
| 186 | cag->mOwner = 0; |
| 187 | return cag; |
| 188 | } |
| 189 | |
| 190 | void delete_SDLOSXCAGuard(SDLOSXCAGuard *cag) |
| 191 | { |
| 192 | if (cag != NULL) |
| 193 | { |
| 194 | pthread_mutex_destroy(&cag->mMutex); |
| 195 | pthread_cond_destroy(&cag->mCondVar); |
| 196 | SDL_free(cag); |
| 197 | } |
| 198 | } |
| 199 | |