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annotate src/thread/pthread/SDL_sysmutex.c @ 4866:f42e8db53f78

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Added a typedef for the thread function to simplify documentation
author Sam Lantinga <slouken@libsdl.org>
date Sat, 28 Aug 2010 22:56:52 -0700
parents f7b03b6838cb
children b530ef003506
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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 #define _GNU_SOURCE
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25 #include <pthread.h>
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26
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27 #include "SDL_thread.h"
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28
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29 #if !SDL_THREAD_PTHREAD_RECURSIVE_MUTEX && \
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30 !SDL_THREAD_PTHREAD_RECURSIVE_MUTEX_NP
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31 #define FAKE_RECURSIVE_MUTEX
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32 #endif
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33
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34 struct SDL_mutex
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35 {
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36 pthread_mutex_t id;
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37 #if FAKE_RECURSIVE_MUTEX
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38 int recursive;
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39 pthread_t owner;
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40 #endif
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41 };
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42
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43 SDL_mutex *
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44 SDL_CreateMutex(void)
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45 {
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46 SDL_mutex *mutex;
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47 pthread_mutexattr_t attr;
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48
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49 /* Allocate the structure */
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50 mutex = (SDL_mutex *) SDL_calloc(1, sizeof(*mutex));
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51 if (mutex) {
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52 pthread_mutexattr_init(&attr);
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53 #if SDL_THREAD_PTHREAD_RECURSIVE_MUTEX
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54 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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55 #elif SDL_THREAD_PTHREAD_RECURSIVE_MUTEX_NP
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56 pthread_mutexattr_setkind_np(&attr, PTHREAD_MUTEX_RECURSIVE_NP);
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57 #else
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58 /* No extra attributes necessary */
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59 #endif
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60 if (pthread_mutex_init(&mutex->id, &attr) != 0) {
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61 SDL_SetError("pthread_mutex_init() failed");
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62 SDL_free(mutex);
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63 mutex = NULL;
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64 }
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65 } else {
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66 SDL_OutOfMemory();
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67 }
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68 return (mutex);
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69 }
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70
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71 void
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72 SDL_DestroyMutex(SDL_mutex * mutex)
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73 {
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74 if (mutex) {
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75 pthread_mutex_destroy(&mutex->id);
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76 SDL_free(mutex);
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77 }
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78 }
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79
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80 /* Lock the mutex */
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81 int
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82 SDL_mutexP(SDL_mutex * mutex)
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83 {
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84 int retval;
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85 #if FAKE_RECURSIVE_MUTEX
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86 pthread_t this_thread;
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87 #endif
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88
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89 if (mutex == NULL) {
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90 SDL_SetError("Passed a NULL mutex");
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91 return -1;
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92 }
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93
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94 retval = 0;
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95 #if FAKE_RECURSIVE_MUTEX
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96 this_thread = pthread_self();
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97 if (mutex->owner == this_thread) {
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98 ++mutex->recursive;
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99 } else {
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100 /* The order of operations is important.
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101 We set the locking thread id after we obtain the lock
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102 so unlocks from other threads will fail.
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103 */
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104 if (pthread_mutex_lock(&mutex->id) == 0) {
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105 mutex->owner = this_thread;
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106 mutex->recursive = 0;
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107 } else {
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108 SDL_SetError("pthread_mutex_lock() failed");
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109 retval = -1;
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110 }
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111 }
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112 #else
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113 if (pthread_mutex_lock(&mutex->id) < 0) {
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114 SDL_SetError("pthread_mutex_lock() failed");
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115 retval = -1;
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116 }
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117 #endif
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118 return retval;
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119 }
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120
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121 int
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122 SDL_mutexV(SDL_mutex * mutex)
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123 {
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124 int retval;
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125
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126 if (mutex == NULL) {
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127 SDL_SetError("Passed a NULL mutex");
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128 return -1;
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129 }
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130
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131 retval = 0;
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132 #if FAKE_RECURSIVE_MUTEX
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133 /* We can only unlock the mutex if we own it */
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134 if (pthread_self() == mutex->owner) {
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135 if (mutex->recursive) {
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136 --mutex->recursive;
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137 } else {
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138 /* The order of operations is important.
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139 First reset the owner so another thread doesn't lock
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140 the mutex and set the ownership before we reset it,
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141 then release the lock semaphore.
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142 */
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143 mutex->owner = 0;
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144 pthread_mutex_unlock(&mutex->id);
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145 }
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146 } else {
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147 SDL_SetError("mutex not owned by this thread");
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148 retval = -1;
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149 }
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150
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151 #else
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152 if (pthread_mutex_unlock(&mutex->id) < 0) {
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153 SDL_SetError("pthread_mutex_unlock() failed");
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154 retval = -1;
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155 }
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156 #endif /* FAKE_RECURSIVE_MUTEX */
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157
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158 return retval;
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159 }
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160
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161 /* vi: set ts=4 sw=4 expandtab: */