annotate src/thread/generic/SDL_syssem.c @ 1627:aee7ea396f59

Fixed bug #179 SDL_SemValue() always returns 0. That's because the underlying POSIX sem_getvalue() is implemented as a noop in Mac OS X. Apart from that, semaphores do work properly (at least according to test/testsem), so I'm not sure if this is worth fixing at all.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 13 Apr 2006 14:04:13 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
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 *SDL_CreateSemaphore(Uint32 initial_value)
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34 {
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35 SDL_SetError("SDL not configured with thread support");
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36 return (SDL_sem *)0;
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37 }
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38
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39 void SDL_DestroySemaphore(SDL_sem *sem)
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40 {
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41 return;
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42 }
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43
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44 int SDL_SemTryWait(SDL_sem *sem)
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45 {
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46 SDL_SetError("SDL not configured with thread support");
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47 return -1;
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48 }
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49
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50 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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51 {
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52 SDL_SetError("SDL not configured with thread support");
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53 return -1;
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54 }
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55
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56 int SDL_SemWait(SDL_sem *sem)
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57 {
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58 SDL_SetError("SDL not configured with thread support");
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59 return -1;
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60 }
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61
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62 Uint32 SDL_SemValue(SDL_sem *sem)
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63 {
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64 return 0;
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65 }
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66
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67 int SDL_SemPost(SDL_sem *sem)
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68 {
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69 SDL_SetError("SDL not configured with thread support");
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70 return -1;
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71 }
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72
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73 #else
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74
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75 struct SDL_semaphore
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76 {
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77 Uint32 count;
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78 Uint32 waiters_count;
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79 SDL_mutex *count_lock;
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80 SDL_cond *count_nonzero;
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81 };
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82
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83 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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84 {
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85 SDL_sem *sem;
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86
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87 sem = (SDL_sem *)SDL_malloc(sizeof(*sem));
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88 if ( ! sem ) {
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89 SDL_OutOfMemory();
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90 return NULL;
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91 }
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92 sem->count = initial_value;
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93 sem->waiters_count = 0;
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94
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95 sem->count_lock = SDL_CreateMutex();
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96 sem->count_nonzero = SDL_CreateCond();
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97 if ( ! sem->count_lock || ! sem->count_nonzero ) {
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98 SDL_DestroySemaphore(sem);
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99 return NULL;
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100 }
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101
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102 return sem;
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103 }
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104
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105 /* WARNING:
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106 You cannot call this function when another thread is using the semaphore.
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107 */
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108 void SDL_DestroySemaphore(SDL_sem *sem)
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109 {
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110 if ( sem ) {
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111 sem->count = 0xFFFFFFFF;
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112 while ( sem->waiters_count > 0) {
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113 SDL_CondSignal(sem->count_nonzero);
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114 SDL_Delay(10);
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115 }
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116 SDL_DestroyCond(sem->count_nonzero);
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117 if ( sem->count_lock ) {
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118 SDL_mutexP(sem->count_lock);
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119 SDL_mutexV(sem->count_lock);
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120 SDL_DestroyMutex(sem->count_lock);
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121 }
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122 SDL_free(sem);
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123 }
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124 }
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125
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126 int SDL_SemTryWait(SDL_sem *sem)
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127 {
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128 int retval;
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129
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130 if ( ! sem ) {
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131 SDL_SetError("Passed a NULL semaphore");
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132 return -1;
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133 }
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134
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135 retval = SDL_MUTEX_TIMEDOUT;
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136 SDL_LockMutex(sem->count_lock);
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137 if ( sem->count > 0 ) {
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138 --sem->count;
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139 retval = 0;
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140 }
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141 SDL_UnlockMutex(sem->count_lock);
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142
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143 return retval;
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144 }
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145
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146 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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147 {
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148 int retval;
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149
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150 if ( ! sem ) {
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151 SDL_SetError("Passed a NULL semaphore");
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152 return -1;
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153 }
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154
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155 /* A timeout of 0 is an easy case */
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156 if ( timeout == 0 ) {
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157 return SDL_SemTryWait(sem);
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158 }
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159
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160 SDL_LockMutex(sem->count_lock);
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161 ++sem->waiters_count;
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162 retval = 0;
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163 while ( (sem->count == 0) && (retval != SDL_MUTEX_TIMEDOUT) ) {
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164 retval = SDL_CondWaitTimeout(sem->count_nonzero,
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165 sem->count_lock, timeout);
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166 }
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167 --sem->waiters_count;
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168 --sem->count;
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169 SDL_UnlockMutex(sem->count_lock);
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170
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171 return retval;
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172 }
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173
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174 int SDL_SemWait(SDL_sem *sem)
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175 {
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176 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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177 }
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178
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179 Uint32 SDL_SemValue(SDL_sem *sem)
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180 {
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181 Uint32 value;
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182
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183 value = 0;
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184 if ( sem ) {
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185 SDL_LockMutex(sem->count_lock);
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186 value = sem->count;
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187 SDL_UnlockMutex(sem->count_lock);
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188 }
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189 return value;
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190 }
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191
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192 int SDL_SemPost(SDL_sem *sem)
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193 {
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194 if ( ! sem ) {
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195 SDL_SetError("Passed a NULL semaphore");
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196 return -1;
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197 }
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198
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199 SDL_LockMutex(sem->count_lock);
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200 if ( sem->waiters_count > 0 ) {
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201 SDL_CondSignal(sem->count_nonzero);
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202 }
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203 ++sem->count;
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204 SDL_UnlockMutex(sem->count_lock);
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205
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206 return 0;
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207 }
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208
1361
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209 #endif /* SDL_THREADS_DISABLED */