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annotate src/thread/riscos/SDL_sysmutex.c @ 4165:3b8ac3d311a2 SDL-1.2

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Hello. This patch provides basic support for video on the Sony PS3 Linux framebuffer. Scaling, format-conversion, and drawing is done from the SPEs, so there is little performance impact to PPE applications. This is by no means production quality code, but it is a very good start and a good example of how to use the PS3's hardware capabilities to accelerate video playback on the box. The driver has been verified to work with ffplay, mplayer and xine. This piece of software has been developed at the IBM R&D Lab in Boeblingen, Germany and is now returned to the community. Enjoy ! Signed-off-by: D.Herrendoerfer < d.herrendoerfer [at] de [dot] ibm [dot] com >
author Sam Lantinga <slouken@libsdl.org>
date Thu, 02 Apr 2009 04:06:55 +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 /* 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 pthread_mutex_t id;
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36 #if SDL_THREAD_PTHREAD_NO_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 *SDL_CreateMutex (void)
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43 {
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44 SDL_mutex *mutex;
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45 pthread_mutexattr_t attr;
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46
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47 /* Allocate the structure */
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48 mutex = (SDL_mutex *)SDL_calloc(1, sizeof(*mutex));
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49 if ( mutex ) {
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50 pthread_mutexattr_init(&attr);
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51 #if SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX
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52 /* No extra attributes necessary */
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53 #else
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54 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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55 #endif /* SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX */
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56 if ( pthread_mutex_init(&mutex->id, &attr) != 0 ) {
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57 SDL_SetError("pthread_mutex_init() failed");
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58 SDL_free(mutex);
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59 mutex = NULL;
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60 }
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61 } else {
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62 SDL_OutOfMemory();
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63 }
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64 return(mutex);
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65 }
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66
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67 void SDL_DestroyMutex(SDL_mutex *mutex)
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68 {
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69 if ( mutex ) {
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70 pthread_mutex_destroy(&mutex->id);
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71 SDL_free(mutex);
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72 }
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73 }
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74
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75 /* Lock the mutex */
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76 int SDL_mutexP(SDL_mutex *mutex)
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77 {
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78 int retval;
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79 #if SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX
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80 pthread_t this_thread;
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81 #endif
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82
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83 if ( mutex == NULL ) {
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84 SDL_SetError("Passed a NULL mutex");
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85 return -1;
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86 }
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87
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88 retval = 0;
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89 #if SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX
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90 this_thread = pthread_self();
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91 if ( mutex->owner == this_thread ) {
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92 ++mutex->recursive;
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93 } else {
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94 /* The order of operations is important.
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95 We set the locking thread id after we obtain the lock
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96 so unlocks from other threads will fail.
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97 */
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98 if ( pthread_mutex_lock(&mutex->id) == 0 ) {
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99 mutex->owner = this_thread;
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100 mutex->recursive = 0;
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101 } else {
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102 SDL_SetError("pthread_mutex_lock() failed");
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103 retval = -1;
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104 }
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105 }
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106 #else
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107 if ( pthread_mutex_lock(&mutex->id) < 0 ) {
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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 #endif
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112 return retval;
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113 }
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114
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115 int SDL_mutexV(SDL_mutex *mutex)
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116 {
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117 int retval;
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118
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119 if ( mutex == NULL ) {
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120 SDL_SetError("Passed a NULL mutex");
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121 return -1;
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122 }
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123
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124 retval = 0;
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125 #if SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX
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126 /* We can only unlock the mutex if we own it */
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127 if ( pthread_self() == mutex->owner ) {
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128 if ( mutex->recursive ) {
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129 --mutex->recursive;
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130 } else {
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131 /* The order of operations is important.
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132 First reset the owner so another thread doesn't lock
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133 the mutex and set the ownership before we reset it,
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134 then release the lock semaphore.
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135 */
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136 mutex->owner = 0;
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137 pthread_mutex_unlock(&mutex->id);
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138 }
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139 } else {
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140 SDL_SetError("mutex not owned by this thread");
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141 retval = -1;
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142 }
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143
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144 #else
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145 if ( pthread_mutex_unlock(&mutex->id) < 0 ) {
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146 SDL_SetError("pthread_mutex_unlock() failed");
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147 retval = -1;
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148 }
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
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149 #endif /* SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX */
955
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150
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151 return retval;
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152 }
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153 #endif