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annotate src/cdrom/macosx/SDLOSXCAGuard.c @ 1895:c121d94672cb

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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 10 Jul 2006 21:04:37 +0000
parents dc6b59e925a2
children 99210400e8b9
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 #include "SDL_config.h"
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23
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24 /*
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25 Note: This file hasn't been modified so technically we have to keep the disclaimer :-(
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26
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27 Copyright: © Copyright 2002 Apple Computer, Inc. All rights reserved.
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28
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29 Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
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30 ("Apple") in consideration of your agreement to the following terms, and your
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31 use, installation, modification or redistribution of this Apple software
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32 constitutes acceptance of these terms. If you do not agree with these terms,
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33 please do not use, install, modify or redistribute this Apple software.
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34
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35 In consideration of your agreement to abide by the following terms, and subject
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36 to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs
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37 copyrights in this original Apple software (the "Apple Software"), to use,
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38 reproduce, modify and redistribute the Apple Software, with or without
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39 modifications, in source and/or binary forms; provided that if you redistribute
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40 the Apple Software in its entirety and without modifications, you must retain
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41 this notice and the following text and disclaimers in all such redistributions of
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42 the Apple Software. Neither the name, trademarks, service marks or logos of
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43 Apple Computer, Inc. may be used to endorse or promote products derived from the
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44 Apple Software without specific prior written permission from Apple. Except as
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45 expressly stated in this notice, no other rights or licenses, express or implied,
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46 are granted by Apple herein, including but not limited to any patent rights that
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47 may be infringed by your derivative works or by other works in which the Apple
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48 Software may be incorporated.
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49
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50 The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
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51 WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
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52 WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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53 PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
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54 COMBINATION WITH YOUR PRODUCTS.
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55
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56 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
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57 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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58 GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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59 ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
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60 OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
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61 (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
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62 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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63 */
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64 /*=============================================================================
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65 CAGuard.cp
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66
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67 =============================================================================*/
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68
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69 /*=============================================================================
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70 Includes
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71 =============================================================================*/
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72
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73 /*
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74 #include <stdio.h>
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75 #include <stdlib.h>
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76 #include <string.h>
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77 */
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78 #include "SDL_stdinc.h"
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79
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80 /*#define NDEBUG 1*/
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81 /*
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82 #include <assert.h>
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83 */
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84 #define assert(X)
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85
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86
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87 #include "SDLOSXCAGuard.h"
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88
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89 /*#warning Need a try-based Locker too*/
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90 /*=============================================================================
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91 SDLOSXCAGuard
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92 =============================================================================*/
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93
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94 static int
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95 SDLOSXCAGuard_Lock(SDLOSXCAGuard * cag)
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96 {
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97 int theAnswer = 0;
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98
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99 if (pthread_self() != cag->mOwner) {
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100 OSStatus theError = pthread_mutex_lock(&cag->mMutex);
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101 (void) theError;
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102 assert(theError == 0);
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103 cag->mOwner = pthread_self();
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104 theAnswer = 1;
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105 }
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106
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107 return theAnswer;
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108 }
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109
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110 static void
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111 SDLOSXCAGuard_Unlock(SDLOSXCAGuard * cag)
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112 {
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113 OSStatus theError;
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114 assert(pthread_self() == cag->mOwner);
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115
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116 cag->mOwner = 0;
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117 theError = pthread_mutex_unlock(&cag->mMutex);
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118 (void) theError;
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119 assert(theError == 0);
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120 }
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121
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122 static int
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123 SDLOSXCAGuard_Try(SDLOSXCAGuard * cag, int *outWasLocked)
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124 {
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125 int theAnswer = 0;
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126 *outWasLocked = 0;
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127
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128 if (pthread_self() == cag->mOwner) {
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129 theAnswer = 1;
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130 *outWasLocked = 0;
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131 } else {
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132 OSStatus theError = pthread_mutex_trylock(&cag->mMutex);
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133 if (theError == 0) {
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134 cag->mOwner = pthread_self();
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135 theAnswer = 1;
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136 *outWasLocked = 1;
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137 }
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138 }
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139
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140 return theAnswer;
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141 }
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142
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143 static void
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144 SDLOSXCAGuard_Wait(SDLOSXCAGuard * cag)
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145 {
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146 OSStatus theError;
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147 assert(pthread_self() == cag->mOwner);
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148
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149 cag->mOwner = 0;
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150
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151 theError = pthread_cond_wait(&cag->mCondVar, &cag->mMutex);
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152 (void) theError;
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153 assert(theError == 0);
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154 cag->mOwner = pthread_self();
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155 }
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156
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157 static void
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158 SDLOSXCAGuard_Notify(SDLOSXCAGuard * cag)
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159 {
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160 OSStatus theError = pthread_cond_signal(&cag->mCondVar);
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161 (void) theError;
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162 assert(theError == 0);
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163 }
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164
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165
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166 SDLOSXCAGuard *
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167 new_SDLOSXCAGuard(void)
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168 {
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169 OSStatus theError;
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170 SDLOSXCAGuard *cag = (SDLOSXCAGuard *) SDL_malloc(sizeof(SDLOSXCAGuard));
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171 if (cag == NULL)
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172 return NULL;
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173 SDL_memset(cag, '\0', sizeof(*cag));
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174
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175 #define SET_SDLOSXCAGUARD_METHOD(m) cag->m = SDLOSXCAGuard_##m
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176 SET_SDLOSXCAGUARD_METHOD(Lock);
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177 SET_SDLOSXCAGUARD_METHOD(Unlock);
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178 SET_SDLOSXCAGUARD_METHOD(Try);
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179 SET_SDLOSXCAGUARD_METHOD(Wait);
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180 SET_SDLOSXCAGUARD_METHOD(Notify);
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181 #undef SET_SDLOSXCAGUARD_METHOD
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182
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183 theError = pthread_mutex_init(&cag->mMutex, NULL);
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184 (void) theError;
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185 assert(theError == 0);
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186
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187 theError = pthread_cond_init(&cag->mCondVar, NULL);
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188 (void) theError;
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189 assert(theError == 0);
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190
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191 cag->mOwner = 0;
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192 return cag;
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193 }
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194
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195 void
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196 delete_SDLOSXCAGuard(SDLOSXCAGuard * cag)
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197 {
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198 if (cag != NULL) {
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199 pthread_mutex_destroy(&cag->mMutex);
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200 pthread_cond_destroy(&cag->mCondVar);
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201 SDL_free(cag);
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202 }
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203 }
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204
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205 /* vi: set ts=4 sw=4 expandtab: */