Mercurial > sdl-ios-xcode

annotate src/thread/pthread/SDL_sysmutex.c @ 4235:88aa213ffc7b SDL-1.2

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Possibly fixed bug #601, definitely fixed a potential issue with threads stopping and starting in rapid succession.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 23 Sep 2009 06:35:28 +0000
parents a1b03ba2fcd0
children
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 pthread_mutex_t id;
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35 #if FAKE_RECURSIVE_MUTEX
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36 int recursive;
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37 pthread_t owner;
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38 #endif
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39 };
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40
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41 SDL_mutex *SDL_CreateMutex (void)
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42 {
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43 SDL_mutex *mutex;
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44 pthread_mutexattr_t attr;
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45
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46 /* Allocate the structure */
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47 mutex = (SDL_mutex *)SDL_calloc(1, sizeof(*mutex));
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48 if ( mutex ) {
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49 pthread_mutexattr_init(&attr);
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50 #if SDL_THREAD_PTHREAD_RECURSIVE_MUTEX
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51 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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52 #elif SDL_THREAD_PTHREAD_RECURSIVE_MUTEX_NP
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53 pthread_mutexattr_setkind_np(&attr, PTHREAD_MUTEX_RECURSIVE_NP);
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54 #else
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55 /* No extra attributes necessary */
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56 #endif
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57 if ( pthread_mutex_init(&mutex->id, &attr) != 0 ) {
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58 SDL_SetError("pthread_mutex_init() failed");
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59 SDL_free(mutex);
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60 mutex = NULL;
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61 }
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62 } else {
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63 SDL_OutOfMemory();
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64 }
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65 return(mutex);
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66 }
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67
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68 void SDL_DestroyMutex(SDL_mutex *mutex)
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69 {
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70 if ( mutex ) {
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71 pthread_mutex_destroy(&mutex->id);
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72 SDL_free(mutex);
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73 }
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74 }
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75
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76 /* Lock the mutex */
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77 int SDL_mutexP(SDL_mutex *mutex)
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78 {
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79 int retval;
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80 #if FAKE_RECURSIVE_MUTEX
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81 pthread_t this_thread;
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82 #endif
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83
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84 if ( mutex == NULL ) {
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85 SDL_SetError("Passed a NULL mutex");
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86 return -1;
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87 }
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88
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89 retval = 0;
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90 #if FAKE_RECURSIVE_MUTEX
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91 this_thread = pthread_self();
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92 if ( mutex->owner == this_thread ) {
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93 ++mutex->recursive;
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94 } else {
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95 /* The order of operations is important.
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96 We set the locking thread id after we obtain the lock
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97 so unlocks from other threads will fail.
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98 */
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99 if ( pthread_mutex_lock(&mutex->id) == 0 ) {
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100 mutex->owner = this_thread;
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101 mutex->recursive = 0;
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102 } else {
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103 SDL_SetError("pthread_mutex_lock() failed");
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104 retval = -1;
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105 }
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106 }
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107 #else
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108 if ( pthread_mutex_lock(&mutex->id) < 0 ) {
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109 SDL_SetError("pthread_mutex_lock() failed");
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110 retval = -1;
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111 }
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112 #endif
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113 return retval;
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114 }
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115
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116 int SDL_mutexV(SDL_mutex *mutex)
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117 {
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118 int retval;
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119
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120 if ( mutex == NULL ) {
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121 SDL_SetError("Passed a NULL mutex");
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122 return -1;
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123 }
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124
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125 retval = 0;
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126 #if FAKE_RECURSIVE_MUTEX
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127 /* We can only unlock the mutex if we own it */
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128 if ( pthread_self() == mutex->owner ) {
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129 if ( mutex->recursive ) {
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130 --mutex->recursive;
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131 } else {
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132 /* The order of operations is important.
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133 First reset the owner so another thread doesn't lock
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134 the mutex and set the ownership before we reset it,
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135 then release the lock semaphore.
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136 */
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137 mutex->owner = 0;
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138 pthread_mutex_unlock(&mutex->id);
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139 }
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140 } else {
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141 SDL_SetError("mutex not owned by this thread");
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142 retval = -1;
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143 }
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144
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145 #else
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146 if ( pthread_mutex_unlock(&mutex->id) < 0 ) {
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147 SDL_SetError("pthread_mutex_unlock() failed");
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148 retval = -1;
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149 }
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150 #endif /* FAKE_RECURSIVE_MUTEX */
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151
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152 return retval;
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153 }