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annotate src/thread/pthread/SDL_sysmutex.c @ 5172:ededa1ccf91c

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Switched the SDL 1.2 compatibility to use the window surface, so it's fast even when there's no hardware acceleration available. This means that the YUV overlay now uses software, but that's okay since fast YUV code should be using the textures now anyway.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 03 Feb 2011 21:13:55 -0800
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: */