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annotate src/thread/nds/SDL_syssem.c @ 3542:97eae5a705f9

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author Sam Lantinga <slouken@libsdl.org>
date Fri, 11 Dec 2009 09:57:54 +0000
parents 99210400e8b9
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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id: SDL_syssem.c,v 1.2 2001/04/26 16:50:18 hercules Exp $";
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26 #endif
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27
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28 /* An implementation of semaphores using mutexes and condition variables */
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29
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30 #include <stdlib.h>
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31
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32 #include "SDL_error.h"
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33 #include "SDL_timer.h"
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34 #include "SDL_thread.h"
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35 #include "SDL_systhread_c.h"
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36
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37
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38 #ifdef DISABLE_THREADS
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39
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40 SDL_sem *
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41 SDL_CreateSemaphore(Uint32 initial_value)
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42 {
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43 SDL_SetError("SDL not configured with thread support");
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44 return (SDL_sem *) 0;
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45 }
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46
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47 void
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48 SDL_DestroySemaphore(SDL_sem * sem)
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49 {
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50 return;
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51 }
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52
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53 int
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54 SDL_SemTryWait(SDL_sem * sem)
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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_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
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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 int
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68 SDL_SemWait(SDL_sem * sem)
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69 {
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70 SDL_SetError("SDL not configured with thread support");
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71 return -1;
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72 }
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73
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74 Uint32
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75 SDL_SemValue(SDL_sem * sem)
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76 {
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77 return 0;
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78 }
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79
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80 int
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81 SDL_SemPost(SDL_sem * sem)
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82 {
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83 SDL_SetError("SDL not configured with thread support");
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84 return -1;
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85 }
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86
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87 #else
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88
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89 struct SDL_semaphore
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90 {
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91 Uint32 count;
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92 Uint32 waiters_count;
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93 SDL_mutex *count_lock;
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94 SDL_cond *count_nonzero;
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95 };
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96
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97 SDL_sem *
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98 SDL_CreateSemaphore(Uint32 initial_value)
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99 {
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100 SDL_sem *sem;
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101
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102 sem = (SDL_sem *) malloc(sizeof(*sem));
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103 if (!sem) {
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104 SDL_OutOfMemory();
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105 return (0);
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106 }
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107 sem->count = initial_value;
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108 sem->waiters_count = 0;
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109
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110 sem->count_lock = SDL_CreateMutex();
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111 sem->count_nonzero = SDL_CreateCond();
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112 if (!sem->count_lock || !sem->count_nonzero) {
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113 SDL_DestroySemaphore(sem);
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114 return (0);
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115 }
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116
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117 return (sem);
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118 }
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119
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120 /* WARNING:
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121 You cannot call this function when another thread is using the semaphore.
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122 */
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123 void
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124 SDL_DestroySemaphore(SDL_sem * sem)
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125 {
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126 if (sem) {
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127 sem->count = 0xFFFFFFFF;
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128 while (sem->waiters_count > 0) {
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129 SDL_CondSignal(sem->count_nonzero);
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130 SDL_Delay(10);
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131 }
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132 SDL_DestroyCond(sem->count_nonzero);
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133 SDL_mutexP(sem->count_lock);
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134 SDL_mutexV(sem->count_lock);
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135 SDL_DestroyMutex(sem->count_lock);
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136 free(sem);
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137 }
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138 }
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139
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140 int
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141 SDL_SemTryWait(SDL_sem * sem)
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142 {
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143 int retval;
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144
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145 if (!sem) {
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146 SDL_SetError("Passed a NULL semaphore");
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147 return -1;
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148 }
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149
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150 retval = SDL_MUTEX_TIMEDOUT;
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151 SDL_LockMutex(sem->count_lock);
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152 if (sem->count > 0) {
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153 --sem->count;
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154 retval = 0;
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155 }
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156 SDL_UnlockMutex(sem->count_lock);
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157
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158 return retval;
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159 }
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160
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161 int
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162 SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
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163 {
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164 int retval;
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165
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166 if (!sem) {
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167 SDL_SetError("Passed a NULL semaphore");
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168 return -1;
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169 }
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170
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171 /* A timeout of 0 is an easy case */
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172 if (timeout == 0) {
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173 return SDL_SemTryWait(sem);
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174 }
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175
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176 SDL_LockMutex(sem->count_lock);
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177 ++sem->waiters_count;
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178 retval = 0;
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179 while ((sem->count == 0) && (retval != SDL_MUTEX_TIMEDOUT)) {
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180 retval = SDL_CondWaitTimeout(sem->count_nonzero,
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181 sem->count_lock, timeout);
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182 }
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183 --sem->waiters_count;
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184 --sem->count;
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185 SDL_UnlockMutex(sem->count_lock);
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186
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187 return retval;
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188 }
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189
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190 int
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191 SDL_SemWait(SDL_sem * sem)
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192 {
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193 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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194 }
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195
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196 Uint32
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197 SDL_SemValue(SDL_sem * sem)
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198 {
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199 Uint32 value;
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200
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201 value = 0;
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202 if (sem) {
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203 SDL_LockMutex(sem->count_lock);
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204 value = sem->count;
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205 SDL_UnlockMutex(sem->count_lock);
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206 }
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207 return value;
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208 }
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209
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210 int
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211 SDL_SemPost(SDL_sem * sem)
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212 {
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213 if (!sem) {
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214 SDL_SetError("Passed a NULL semaphore");
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215 return -1;
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216 }
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217
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218 SDL_LockMutex(sem->count_lock);
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219 if (sem->waiters_count > 0) {
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220 SDL_CondSignal(sem->count_nonzero);
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221 }
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222 ++sem->count;
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223 SDL_UnlockMutex(sem->count_lock);
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224
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225 return 0;
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226 }
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227
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228 #endif /* DISABLE_THREADS */