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annotate src/thread/pthread/SDL_sysmutex.c @ 2445:d65e44861a15 gsoc2008_iphone

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added comment
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Sat, 16 Aug 2008 00:09:10 +0000
parents c121d94672cb
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) 1997-2006 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: */