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annotate src/thread/generic/SDL_syssem.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 /* An implementation of semaphores using mutexes and condition variables */
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25
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26 #include "SDL_timer.h"
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27 #include "SDL_thread.h"
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28 #include "SDL_systhread_c.h"
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29
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30
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31 #if SDL_THREADS_DISABLED
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32
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33 SDL_sem *
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34 SDL_CreateSemaphore(Uint32 initial_value)
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35 {
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36 SDL_SetError("SDL not configured with thread support");
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37 return (SDL_sem *) 0;
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38 }
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39
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40 void
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41 SDL_DestroySemaphore(SDL_sem * sem)
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42 {
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43 return;
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44 }
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45
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46 int
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47 SDL_SemTryWait(SDL_sem * sem)
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48 {
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49 SDL_SetError("SDL not configured with thread support");
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50 return -1;
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51 }
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52
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53 int
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54 SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
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55 {
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56 SDL_SetError("SDL not configured with thread support");
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57 return -1;
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58 }
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59
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60 int
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61 SDL_SemWait(SDL_sem * sem)
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62 {
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63 SDL_SetError("SDL not configured with thread support");
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64 return -1;
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65 }
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66
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67 Uint32
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68 SDL_SemValue(SDL_sem * sem)
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69 {
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70 return 0;
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71 }
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72
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73 int
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74 SDL_SemPost(SDL_sem * sem)
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75 {
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76 SDL_SetError("SDL not configured with thread support");
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77 return -1;
0
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78 }
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79
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80 #else
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81
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82 struct SDL_semaphore
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83 {
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84 Uint32 count;
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85 Uint32 waiters_count;
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86 SDL_mutex *count_lock;
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87 SDL_cond *count_nonzero;
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88 };
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89
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90 SDL_sem *
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91 SDL_CreateSemaphore(Uint32 initial_value)
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92 {
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93 SDL_sem *sem;
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94
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95 sem = (SDL_sem *) SDL_malloc(sizeof(*sem));
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96 if (!sem) {
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97 SDL_OutOfMemory();
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98 return NULL;
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99 }
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100 sem->count = initial_value;
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101 sem->waiters_count = 0;
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102
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103 sem->count_lock = SDL_CreateMutex();
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104 sem->count_nonzero = SDL_CreateCond();
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105 if (!sem->count_lock || !sem->count_nonzero) {
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106 SDL_DestroySemaphore(sem);
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107 return NULL;
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108 }
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109
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110 return sem;
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111 }
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112
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113 /* WARNING:
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114 You cannot call this function when another thread is using the semaphore.
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115 */
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116 void
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117 SDL_DestroySemaphore(SDL_sem * sem)
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118 {
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119 if (sem) {
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120 sem->count = 0xFFFFFFFF;
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121 while (sem->waiters_count > 0) {
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122 SDL_CondSignal(sem->count_nonzero);
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123 SDL_Delay(10);
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124 }
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125 SDL_DestroyCond(sem->count_nonzero);
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126 if (sem->count_lock) {
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127 SDL_mutexP(sem->count_lock);
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128 SDL_mutexV(sem->count_lock);
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129 SDL_DestroyMutex(sem->count_lock);
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130 }
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131 SDL_free(sem);
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132 }
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133 }
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134
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135 int
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136 SDL_SemTryWait(SDL_sem * sem)
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137 {
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138 int retval;
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139
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140 if (!sem) {
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141 SDL_SetError("Passed a NULL semaphore");
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142 return -1;
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143 }
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144
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145 retval = SDL_MUTEX_TIMEDOUT;
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146 SDL_LockMutex(sem->count_lock);
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147 if (sem->count > 0) {
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148 --sem->count;
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149 retval = 0;
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150 }
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151 SDL_UnlockMutex(sem->count_lock);
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152
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153 return retval;
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154 }
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155
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156 int
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157 SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
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158 {
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159 int retval;
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160
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161 if (!sem) {
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162 SDL_SetError("Passed a NULL semaphore");
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163 return -1;
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164 }
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165
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166 /* A timeout of 0 is an easy case */
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167 if (timeout == 0) {
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168 return SDL_SemTryWait(sem);
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169 }
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170
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171 SDL_LockMutex(sem->count_lock);
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172 ++sem->waiters_count;
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173 retval = 0;
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174 while ((sem->count == 0) && (retval != SDL_MUTEX_TIMEDOUT)) {
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175 retval = SDL_CondWaitTimeout(sem->count_nonzero,
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176 sem->count_lock, timeout);
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177 }
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178 --sem->waiters_count;
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179 if (retval == 0) {
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180 --sem->count;
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181 }
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182 SDL_UnlockMutex(sem->count_lock);
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183
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184 return retval;
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185 }
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186
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187 int
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188 SDL_SemWait(SDL_sem * sem)
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189 {
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190 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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191 }
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192
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193 Uint32
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194 SDL_SemValue(SDL_sem * sem)
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195 {
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196 Uint32 value;
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197
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198 value = 0;
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199 if (sem) {
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200 SDL_LockMutex(sem->count_lock);
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201 value = sem->count;
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202 SDL_UnlockMutex(sem->count_lock);
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203 }
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204 return value;
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205 }
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206
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207 int
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208 SDL_SemPost(SDL_sem * sem)
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209 {
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210 if (!sem) {
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211 SDL_SetError("Passed a NULL semaphore");
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212 return -1;
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213 }
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214
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215 SDL_LockMutex(sem->count_lock);
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216 if (sem->waiters_count > 0) {
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217 SDL_CondSignal(sem->count_nonzero);
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218 }
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219 ++sem->count;
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220 SDL_UnlockMutex(sem->count_lock);
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221
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222 return 0;
0
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223 }
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224
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225 #endif /* SDL_THREADS_DISABLED */
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226 /* vi: set ts=4 sw=4 expandtab: */