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annotate src/thread/riscos/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 /* RISC OS implementations uses pthreads based on linux code */
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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_THREADS_DISABLED
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29 #include "../generic/SDL_sysmutex.c"
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30 #else
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31
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32 #include <pthread.h>
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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 SDL_THREAD_PTHREAD_NO_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_NO_RECURSIVE_MUTEX
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54 /* No extra attributes necessary */
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55 #else
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56 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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57 #endif /* SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX */
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58 if (pthread_mutex_init(&mutex->id, &attr) != 0) {
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59 SDL_SetError("pthread_mutex_init() failed");
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60 SDL_free(mutex);
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61 mutex = NULL;
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62 }
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63 } else {
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64 SDL_OutOfMemory();
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65 }
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66 return (mutex);
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67 }
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68
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69 void
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70 SDL_DestroyMutex(SDL_mutex * mutex)
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71 {
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72 if (mutex) {
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73 pthread_mutex_destroy(&mutex->id);
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74 SDL_free(mutex);
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75 }
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76 }
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77
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78 /* Lock the mutex */
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79 int
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80 SDL_mutexP(SDL_mutex * mutex)
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81 {
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82 int retval;
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83 #if SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX
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84 pthread_t this_thread;
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85 #endif
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86
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87 if (mutex == NULL) {
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88 SDL_SetError("Passed a NULL mutex");
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89 return -1;
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90 }
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91
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92 retval = 0;
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93 #if SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX
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94 this_thread = pthread_self();
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95 if (mutex->owner == this_thread) {
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96 ++mutex->recursive;
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97 } else {
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98 /* The order of operations is important.
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99 We set the locking thread id after we obtain the lock
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100 so unlocks from other threads will fail.
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101 */
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102 if (pthread_mutex_lock(&mutex->id) == 0) {
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103 mutex->owner = this_thread;
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104 mutex->recursive = 0;
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105 } else {
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106 SDL_SetError("pthread_mutex_lock() failed");
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107 retval = -1;
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108 }
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109 }
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110 #else
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111 if (pthread_mutex_lock(&mutex->id) < 0) {
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112 SDL_SetError("pthread_mutex_lock() failed");
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113 retval = -1;
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114 }
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115 #endif
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116 return retval;
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117 }
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118
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119 int
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120 SDL_mutexV(SDL_mutex * mutex)
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121 {
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122 int retval;
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123
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124 if (mutex == NULL) {
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125 SDL_SetError("Passed a NULL mutex");
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126 return -1;
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127 }
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128
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129 retval = 0;
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130 #if SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX
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131 /* We can only unlock the mutex if we own it */
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132 if (pthread_self() == mutex->owner) {
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133 if (mutex->recursive) {
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134 --mutex->recursive;
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135 } else {
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136 /* The order of operations is important.
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137 First reset the owner so another thread doesn't lock
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138 the mutex and set the ownership before we reset it,
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139 then release the lock semaphore.
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140 */
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141 mutex->owner = 0;
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142 pthread_mutex_unlock(&mutex->id);
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143 }
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144 } else {
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145 SDL_SetError("mutex not owned by this thread");
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146 retval = -1;
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147 }
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148
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149 #else
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150 if (pthread_mutex_unlock(&mutex->id) < 0) {
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151 SDL_SetError("pthread_mutex_unlock() failed");
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152 retval = -1;
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153 }
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154 #endif /* SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX */
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155
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156 return retval;
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157 }
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158 #endif
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159 /* vi: set ts=4 sw=4 expandtab: */