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annotate src/thread/nds/SDL_syscond.c @ 2671:c3e7c0698cbb gsoc2008_nds

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some changes to the dummy driver for debug purposes that should be reverted. most importantly, commenting out a check for an env. var.
author Darren Alton <dalton@stevens.edu>
date Thu, 12 Jun 2008 02:38:49 +0000
parents 6e4669f4db49
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, 1998, 1999, 2000, 2001 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_syscond.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 condition variables using semaphores and mutexes */
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29 /*
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30 This implementation borrows heavily from the BeOS condition variable
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31 implementation, written by Christopher Tate and Owen Smith. Thanks!
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32 */
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33
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34 #include <stdio.h>
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35 #include <stdlib.h>
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36
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37 #include "SDL_error.h"
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38 #include "SDL_thread.h"
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39
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40 struct SDL_cond
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41 {
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42 SDL_mutex *lock;
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43 int waiting;
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44 int signals;
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45 SDL_sem *wait_sem;
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46 SDL_sem *wait_done;
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47 };
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48
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49 /* Create a condition variable */
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50 SDL_cond *
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51 SDL_CreateCond(void)
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52 {
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53 SDL_cond *cond;
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54
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55 cond = (SDL_cond *) malloc(sizeof(SDL_cond));
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56 if (cond) {
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57 cond->lock = SDL_CreateMutex();
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58 cond->wait_sem = SDL_CreateSemaphore(0);
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59 cond->wait_done = SDL_CreateSemaphore(0);
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60 cond->waiting = cond->signals = 0;
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61 if (!cond->lock || !cond->wait_sem || !cond->wait_done) {
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62 SDL_DestroyCond(cond);
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63 cond = NULL;
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64 }
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65 } else {
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66 SDL_OutOfMemory();
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67 }
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68 return (cond);
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69 }
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71 /* Destroy a condition variable */
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72 void
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73 SDL_DestroyCond(SDL_cond * cond)
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74 {
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75 if (cond) {
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76 if (cond->wait_sem) {
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77 SDL_DestroySemaphore(cond->wait_sem);
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78 }
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79 if (cond->wait_done) {
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80 SDL_DestroySemaphore(cond->wait_done);
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81 }
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82 if (cond->lock) {
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83 SDL_DestroyMutex(cond->lock);
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84 }
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85 free(cond);
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86 }
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87 }
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88
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89 /* Restart one of the threads that are waiting on the condition variable */
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90 int
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91 SDL_CondSignal(SDL_cond * cond)
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92 {
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93 if (!cond) {
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94 SDL_SetError("Passed a NULL condition variable");
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95 return -1;
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96 }
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97
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98 /* If there are waiting threads not already signalled, then
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99 signal the condition and wait for the thread to respond.
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100 */
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101 SDL_LockMutex(cond->lock);
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102 if (cond->waiting > cond->signals) {
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103 ++cond->signals;
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104 SDL_SemPost(cond->wait_sem);
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105 SDL_UnlockMutex(cond->lock);
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106 SDL_SemWait(cond->wait_done);
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107 } else {
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108 SDL_UnlockMutex(cond->lock);
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109 }
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110
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111 return 0;
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112 }
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113
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114 /* Restart all threads that are waiting on the condition variable */
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115 int
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116 SDL_CondBroadcast(SDL_cond * cond)
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117 {
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118 if (!cond) {
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119 SDL_SetError("Passed a NULL condition variable");
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120 return -1;
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121 }
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122
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123 /* If there are waiting threads not already signalled, then
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124 signal the condition and wait for the thread to respond.
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125 */
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126 SDL_LockMutex(cond->lock);
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127 if (cond->waiting > cond->signals) {
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128 int i, num_waiting;
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129
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130 num_waiting = (cond->waiting - cond->signals);
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131 cond->signals = cond->waiting;
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132 for (i = 0; i < num_waiting; ++i) {
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133 SDL_SemPost(cond->wait_sem);
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134 }
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135 /* Now all released threads are blocked here, waiting for us.
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136 Collect them all (and win fabulous prizes!) :-)
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137 */
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138 SDL_UnlockMutex(cond->lock);
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139 for (i = 0; i < num_waiting; ++i) {
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140 SDL_SemWait(cond->wait_done);
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141 }
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142 } else {
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143 SDL_UnlockMutex(cond->lock);
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144 }
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145
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146 return 0;
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147 }
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148
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149 /* Wait on the condition variable for at most 'ms' milliseconds.
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150 The mutex must be locked before entering this function!
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151 The mutex is unlocked during the wait, and locked again after the wait.
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152
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153 Typical use:
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154
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155 Thread A:
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156 SDL_LockMutex(lock);
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157 while ( ! condition ) {
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158 SDL_CondWait(cond);
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159 }
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160 SDL_UnlockMutex(lock);
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161
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162 Thread B:
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163 SDL_LockMutex(lock);
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164 ...
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165 condition = true;
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166 ...
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167 SDL_UnlockMutex(lock);
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168 */
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169 int
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170 SDL_CondWaitTimeout(SDL_cond * cond, SDL_mutex * mutex, Uint32 ms)
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171 {
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172 int retval;
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173
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174 if (!cond) {
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175 SDL_SetError("Passed a NULL condition variable");
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176 return -1;
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177 }
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178
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179 /* Obtain the protection mutex, and increment the number of waiters.
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180 This allows the signal mechanism to only perform a signal if there
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181 are waiting threads.
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182 */
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183 SDL_LockMutex(cond->lock);
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184 ++cond->waiting;
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185 SDL_UnlockMutex(cond->lock);
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186
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187 /* Unlock the mutex, as is required by condition variable semantics */
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188 SDL_UnlockMutex(mutex);
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189
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190 /* Wait for a signal */
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191 if (ms == SDL_MUTEX_MAXWAIT) {
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192 retval = SDL_SemWait(cond->wait_sem);
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193 } else {
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194 retval = SDL_SemWaitTimeout(cond->wait_sem, ms);
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195 }
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196
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197 /* Let the signaler know we have completed the wait, otherwise
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198 the signaler can race ahead and get the condition semaphore
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199 if we are stopped between the mutex unlock and semaphore wait,
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200 giving a deadlock. See the following URL for details:
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201 http://www-classic.be.com/aboutbe/benewsletter/volume_III/Issue40.html
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202 */
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203 SDL_LockMutex(cond->lock);
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204 if (cond->signals > 0) {
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205 /* If we timed out, we need to eat a condition signal */
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206 if (retval > 0) {
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207 SDL_SemWait(cond->wait_sem);
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208 }
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209 /* We always notify the signal thread that we are done */
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210 SDL_SemPost(cond->wait_done);
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211
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212 /* Signal handshake complete */
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213 --cond->signals;
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214 }
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215 --cond->waiting;
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216 SDL_UnlockMutex(cond->lock);
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217
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218 /* Lock the mutex, as is required by condition variable semantics */
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219 SDL_LockMutex(mutex);
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220
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221 return retval;
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222 }
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223
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224 /* Wait on the condition variable forever */
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225 int
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226 SDL_CondWait(SDL_cond * cond, SDL_mutex * mutex)
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227 {
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228 return SDL_CondWaitTimeout(cond, mutex, SDL_MUTEX_MAXWAIT);
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229 }