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annotate src/thread/pthread/SDL_sysmutex.c @ 3070:3e3724fb829e

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Fixed bug #681 Description From Philipp 2009-01-16 20:50:01 (-) [reply] The File test/README from the svn says this: testgl A very simple example of using OpenGL with SDL testgl2 Improved version of testgl It is actually exchanged. testgl.c is the improved version right now and testgl2.c the simple one.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 17 Feb 2009 05:44:49 +0000
parents 99210400e8b9
children 55b0a0191163
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 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 Lesser 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 Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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 #include <pthread.h>
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25
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26 #include "SDL_thread.h"
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27
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28 #if !SDL_THREAD_PTHREAD_RECURSIVE_MUTEX && \
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29 !SDL_THREAD_PTHREAD_RECURSIVE_MUTEX_NP
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30 #define FAKE_RECURSIVE_MUTEX
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31 #endif
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32
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33 struct SDL_mutex
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34 {
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35 pthread_mutex_t id;
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36 #if FAKE_RECURSIVE_MUTEX
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37 int recursive;
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38 pthread_t owner;
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39 #endif
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40 };
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41
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42 SDL_mutex *
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43 SDL_CreateMutex(void)
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44 {
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45 SDL_mutex *mutex;
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46 pthread_mutexattr_t attr;
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47
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48 /* Allocate the structure */
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49 mutex = (SDL_mutex *) SDL_calloc(1, sizeof(*mutex));
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50 if (mutex) {
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51 pthread_mutexattr_init(&attr);
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52 #if SDL_THREAD_PTHREAD_RECURSIVE_MUTEX
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53 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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54 #elif SDL_THREAD_PTHREAD_RECURSIVE_MUTEX_NP
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55 pthread_mutexattr_setkind_np(&attr, PTHREAD_MUTEX_RECURSIVE_NP);
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56 #else
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57 /* No extra attributes necessary */
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58 #endif
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59 if (pthread_mutex_init(&mutex->id, &attr) != 0) {
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60 SDL_SetError("pthread_mutex_init() failed");
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61 SDL_free(mutex);
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62 mutex = NULL;
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63 }
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64 } else {
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65 SDL_OutOfMemory();
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66 }
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67 return (mutex);
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68 }
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69
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70 void
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71 SDL_DestroyMutex(SDL_mutex * mutex)
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72 {
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73 if (mutex) {
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74 pthread_mutex_destroy(&mutex->id);
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75 SDL_free(mutex);
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76 }
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77 }
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78
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79 /* Lock the mutex */
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80 int
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81 SDL_mutexP(SDL_mutex * mutex)
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82 {
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83 int retval;
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84 #if FAKE_RECURSIVE_MUTEX
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85 pthread_t this_thread;
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86 #endif
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87
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88 if (mutex == NULL) {
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89 SDL_SetError("Passed a NULL mutex");
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90 return -1;
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91 }
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92
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93 retval = 0;
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94 #if FAKE_RECURSIVE_MUTEX
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95 this_thread = pthread_self();
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96 if (mutex->owner == this_thread) {
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97 ++mutex->recursive;
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98 } else {
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99 /* The order of operations is important.
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100 We set the locking thread id after we obtain the lock
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101 so unlocks from other threads will fail.
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102 */
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103 if (pthread_mutex_lock(&mutex->id) == 0) {
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104 mutex->owner = this_thread;
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105 mutex->recursive = 0;
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106 } else {
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107 SDL_SetError("pthread_mutex_lock() failed");
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108 retval = -1;
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109 }
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110 }
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111 #else
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112 if (pthread_mutex_lock(&mutex->id) < 0) {
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113 SDL_SetError("pthread_mutex_lock() failed");
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114 retval = -1;
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115 }
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116 #endif
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117 return retval;
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118 }
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119
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120 int
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121 SDL_mutexV(SDL_mutex * mutex)
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122 {
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123 int retval;
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124
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125 if (mutex == NULL) {
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126 SDL_SetError("Passed a NULL mutex");
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127 return -1;
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128 }
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129
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130 retval = 0;
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131 #if FAKE_RECURSIVE_MUTEX
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132 /* We can only unlock the mutex if we own it */
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133 if (pthread_self() == mutex->owner) {
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134 if (mutex->recursive) {
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135 --mutex->recursive;
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136 } else {
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137 /* The order of operations is important.
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138 First reset the owner so another thread doesn't lock
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139 the mutex and set the ownership before we reset it,
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140 then release the lock semaphore.
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141 */
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142 mutex->owner = 0;
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143 pthread_mutex_unlock(&mutex->id);
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144 }
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145 } else {
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146 SDL_SetError("mutex not owned by this thread");
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147 retval = -1;
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148 }
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149
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150 #else
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151 if (pthread_mutex_unlock(&mutex->id) < 0) {
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152 SDL_SetError("pthread_mutex_unlock() failed");
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153 retval = -1;
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154 }
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155 #endif /* FAKE_RECURSIVE_MUTEX */
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156
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157 return retval;
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158 }
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159
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160 /* vi: set ts=4 sw=4 expandtab: */