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annotate src/thread/riscos/SDL_sysmutex.c @ 4590:1ad70fb49fcb

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Fix so many things that there is little place in this column to list them all but the result is that blending modes just work now for drawing primitives. Fixes involved: 1. Fix handling of alpha channel when SDL_BLENDMODE_NONE is set. 2. Make xrendercolor use floating-point values for color channels and then convert to 16 bit ints. 3. Fix handling of visuals in SDL_x11modes.c so that a 32 bit ARGB visual is used. 4. Fix the background pixel value in SDL_x11window.c so that the window background has an alpha value of 0xFF and not 0.
author Sunny Sachanandani <sunnysachanandani@gmail.com>
date Fri, 09 Jul 2010 21:36:41 +0530
parents f7b03b6838cb
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) 1997-2010 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 /* 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: */