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annotate src/thread/generic/SDL_syssem.c @ 3469:8c5fb2a3b11d

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RenderReadPixels and RenderWritePixels functions work with back buffer now and all asynchronous operations are flushed before reading or writing to backbuffer. Thanks Sam for clarification of this.
author Mike Gorchak <lestat@i.com.ua>
date Sat, 21 Nov 2009 06:17:50 +0000
parents 77f2f10b81a7
children f7b03b6838cb
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 /* 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: */