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annotate src/thread/generic/SDL_syssem.c @ 1675:d33dcfc3fde7 SDL-1.3

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Overlay functions are being replaced by YUV textures. If the driver doesn't support YUV textures, they can be emulated by backing the texture with an RGB texture and using the software conversion routines. Note that it doesn't make sense to lock a portion of a YV12 texture, since you'd need to return three pixel pointers and pitch values instead of the one that's available through the API. I'm guessing that's one of the reasons DirectX 9 doesn't support this format at all.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 11 Jun 2006 07:30:16 +0000
parents 4da1ee79c9af
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rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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;
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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 --sem->count;
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180 SDL_UnlockMutex(sem->count_lock);
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181
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182 return retval;
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183 }
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184
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185 int
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186 SDL_SemWait(SDL_sem * sem)
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187 {
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188 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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189 }
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190
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191 Uint32
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192 SDL_SemValue(SDL_sem * sem)
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193 {
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194 Uint32 value;
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195
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196 value = 0;
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197 if (sem) {
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198 SDL_LockMutex(sem->count_lock);
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199 value = sem->count;
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200 SDL_UnlockMutex(sem->count_lock);
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201 }
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202 return value;
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203 }
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204
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205 int
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206 SDL_SemPost(SDL_sem * sem)
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207 {
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208 if (!sem) {
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209 SDL_SetError("Passed a NULL semaphore");
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210 return -1;
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211 }
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212
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213 SDL_LockMutex(sem->count_lock);
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214 if (sem->waiters_count > 0) {
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215 SDL_CondSignal(sem->count_nonzero);
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216 }
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217 ++sem->count;
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218 SDL_UnlockMutex(sem->count_lock);
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219
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220 return 0;
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221 }
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222
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223 #endif /* SDL_THREADS_DISABLED */
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224 /* vi: set ts=4 sw=4 expandtab: */