Mercurial > sdl-ios-xcode

annotate src/cdrom/macosx/SDLOSXCAGuard.c @ 1358:c71e05b4dc2e

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More header massaging... works great on Windows. ;-)
author Sam Lantinga <slouken@libsdl.org>
date Fri, 10 Feb 2006 06:48:43 +0000
parents 604d73db6802
children d910939febfa
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 /*
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23 Note: This file hasn't been modified so technically we have to keep the disclaimer :-(
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24
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25 Copyright: © Copyright 2002 Apple Computer, Inc. All rights reserved.
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26
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27 Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
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28 ("Apple") in consideration of your agreement to the following terms, and your
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29 use, installation, modification or redistribution of this Apple software
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30 constitutes acceptance of these terms. If you do not agree with these terms,
71a2648acc75 Replaced Mac OS X's C++ cdrom code with almost-direct translation to C. Sam
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31 please do not use, install, modify or redistribute this Apple software.
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32
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33 In consideration of your agreement to abide by the following terms, and subject
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34 to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs
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35 copyrights in this original Apple software (the "Apple Software"), to use,
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36 reproduce, modify and redistribute the Apple Software, with or without
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37 modifications, in source and/or binary forms; provided that if you redistribute
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38 the Apple Software in its entirety and without modifications, you must retain
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39 this notice and the following text and disclaimers in all such redistributions of
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40 the Apple Software. Neither the name, trademarks, service marks or logos of
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41 Apple Computer, Inc. may be used to endorse or promote products derived from the
71a2648acc75 Replaced Mac OS X's C++ cdrom code with almost-direct translation to C. Sam
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42 Apple Software without specific prior written permission from Apple. Except as
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43 expressly stated in this notice, no other rights or licenses, express or implied,
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44 are granted by Apple herein, including but not limited to any patent rights that
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45 may be infringed by your derivative works or by other works in which the Apple
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46 Software may be incorporated.
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47
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48 The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
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49 WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
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50 WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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51 PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
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52 COMBINATION WITH YOUR PRODUCTS.
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53
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54 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
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55 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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56 GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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57 ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
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58 OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
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59 (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
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60 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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61 */
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62 /*=============================================================================
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63 CAGuard.cp
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64
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65 =============================================================================*/
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66
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67 //=============================================================================
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68 // Includes
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69 //=============================================================================
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70
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71 /*
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72 #include <stdio.h>
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73 #include <stdlib.h>
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74 #include <string.h>
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75 */
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76 #include "SDL_stdinc.h"
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77
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78 //#define NDEBUG 1
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79 /*
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80 #include <assert.h>
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81 */
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82 #define assert(X)
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83
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84
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85 #include "SDLOSXCAGuard.h"
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86
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87 //#warning Need a try-based Locker too
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88 //=============================================================================
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89 // SDLOSXCAGuard
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90 //=============================================================================
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91
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92 static int SDLOSXCAGuard_Lock(SDLOSXCAGuard *cag)
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93 {
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94 int theAnswer = 0;
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95
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96 if(pthread_self() != cag->mOwner)
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97 {
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98 OSStatus theError = pthread_mutex_lock(&cag->mMutex);
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99 assert(theError == 0);
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100 cag->mOwner = pthread_self();
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101 theAnswer = 1;
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102 }
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103
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104 return theAnswer;
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105 }
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106
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107 static void SDLOSXCAGuard_Unlock(SDLOSXCAGuard *cag)
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108 {
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109 assert(pthread_self() == cag->mOwner);
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110
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111 cag->mOwner = 0;
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112 OSStatus theError = pthread_mutex_unlock(&cag->mMutex);
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113 assert(theError == 0);
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114 }
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115
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116 static int SDLOSXCAGuard_Try (SDLOSXCAGuard *cag, int *outWasLocked)
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117 {
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118 int theAnswer = 0;
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119 *outWasLocked = 0;
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120
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121 if (pthread_self() == cag->mOwner) {
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122 theAnswer = 1;
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123 *outWasLocked = 0;
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124 } else {
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125 OSStatus theError = pthread_mutex_trylock(&cag->mMutex);
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126 if (theError == 0) {
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127 cag->mOwner = pthread_self();
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128 theAnswer = 1;
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129 *outWasLocked = 1;
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130 }
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131 }
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132
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133 return theAnswer;
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134 }
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135
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136 static void SDLOSXCAGuard_Wait(SDLOSXCAGuard *cag)
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137 {
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138 assert(pthread_self() == cag->mOwner);
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139
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140 cag->mOwner = 0;
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141
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142 OSStatus theError = pthread_cond_wait(&cag->mCondVar, &cag->mMutex);
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143 assert(theError == 0);
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144 cag->mOwner = pthread_self();
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145 }
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146
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147 static void SDLOSXCAGuard_Notify(SDLOSXCAGuard *cag)
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148 {
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149 OSStatus theError = pthread_cond_signal(&cag->mCondVar);
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150 assert(theError == 0);
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151 }
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152
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153
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154 SDLOSXCAGuard *new_SDLOSXCAGuard(void)
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155 {
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156 SDLOSXCAGuard *cag = (SDLOSXCAGuard *) SDL_malloc(sizeof (SDLOSXCAGuard));
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157 if (cag == NULL)
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158 return NULL;
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159 SDL_memset(cag, '\0', sizeof (*cag));
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160
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161 #define SET_SDLOSXCAGUARD_METHOD(m) cag->m = SDLOSXCAGuard_##m
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162 SET_SDLOSXCAGUARD_METHOD(Lock);
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163 SET_SDLOSXCAGUARD_METHOD(Unlock);
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164 SET_SDLOSXCAGUARD_METHOD(Try);
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165 SET_SDLOSXCAGUARD_METHOD(Wait);
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166 SET_SDLOSXCAGUARD_METHOD(Notify);
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167 #undef SET_SDLOSXCAGUARD_METHOD
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168
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169 OSStatus theError = pthread_mutex_init(&cag->mMutex, NULL);
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170 assert(theError == 0);
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171
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172 theError = pthread_cond_init(&cag->mCondVar, NULL);
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173 assert(theError == 0);
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174
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175 cag->mOwner = 0;
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176 return cag;
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177 }
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178
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179 void delete_SDLOSXCAGuard(SDLOSXCAGuard *cag)
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180 {
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181 if (cag != NULL)
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182 {
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183 pthread_mutex_destroy(&cag->mMutex);
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184 pthread_cond_destroy(&cag->mCondVar);
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185 SDL_free(cag);
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186 }
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187 }
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188