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annotate src/thread/pthread/SDL_syssem.c @ 5108:d547877e355e

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Colin Leroy 2011-01-26 04:24:20 PST the pthread implementation of SDL_SemWaitTimeout() uses busy waiting, while pthread's sem_timedwait() does work. Attached are patches that make use of it
author Sam Lantinga <slouken@libsdl.org>
date Thu, 27 Jan 2011 00:34:12 -0800
parents f7b03b6838cb
children b530ef003506
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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 #include <errno.h>
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25 #include <pthread.h>
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26 #include <semaphore.h>
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27
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28 #include "SDL_thread.h"
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29 #include "SDL_timer.h"
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30
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31 /* Wrapper around POSIX 1003.1b semaphores */
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32
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33 #if defined(__MACOSX__) || defined(__IPHONEOS__)
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34 /* Mac OS X doesn't support sem_getvalue() as of version 10.4 */
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35 #include "../generic/SDL_syssem.c"
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36 #else
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37
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38 struct SDL_semaphore
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39 {
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40 sem_t sem;
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41 };
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42
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43 /* Create a semaphore, initialized with value */
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44 SDL_sem *
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45 SDL_CreateSemaphore(Uint32 initial_value)
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46 {
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47 SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem));
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48 if (sem) {
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49 if (sem_init(&sem->sem, 0, initial_value) < 0) {
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50 SDL_SetError("sem_init() failed");
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51 SDL_free(sem);
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52 sem = NULL;
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53 }
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54 } else {
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55 SDL_OutOfMemory();
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56 }
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57 return sem;
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58 }
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59
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60 void
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61 SDL_DestroySemaphore(SDL_sem * sem)
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62 {
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63 if (sem) {
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64 sem_destroy(&sem->sem);
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65 SDL_free(sem);
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66 }
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67 }
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68
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69 int
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70 SDL_SemTryWait(SDL_sem * sem)
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71 {
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72 int retval;
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73
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74 if (!sem) {
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75 SDL_SetError("Passed a NULL semaphore");
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76 return -1;
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77 }
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78 retval = SDL_MUTEX_TIMEDOUT;
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79 if (sem_trywait(&sem->sem) == 0) {
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80 retval = 0;
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81 }
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82 return retval;
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83 }
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84
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85 int
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86 SDL_SemWait(SDL_sem * sem)
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87 {
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88 int retval;
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89
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90 if (!sem) {
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91 SDL_SetError("Passed a NULL semaphore");
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92 return -1;
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93 }
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94
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95 retval = sem_wait(&sem->sem);
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96 if (retval < 0) {
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97 SDL_SetError("sem_wait() failed");
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98 }
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99 return retval;
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100 }
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101
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102 int
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103 SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
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104 {
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105 int retval;
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106 struct timeval now;
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107 struct timespec ts_timeout;
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108
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109 if (!sem) {
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110 SDL_SetError("Passed a NULL semaphore");
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111 return -1;
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112 }
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113
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114 /* Try the easy cases first */
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115 if (timeout == 0) {
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116 return SDL_SemTryWait(sem);
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117 }
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118 if (timeout == SDL_MUTEX_MAXWAIT) {
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119 return SDL_SemWait(sem);
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120 }
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121
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122 /* Setup the timeout. sem_timedwait doesn't wait for
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123 * a lapse of time, but until we reach a certain time.
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124 * This time is now plus the timeout.
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125 */
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126 gettimeofday(&now, NULL);
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127
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128 /* Add our timeout to current time */
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129 now.tv_usec += (timeout % 1000) * 1000;
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130 now.tv_sec += timeout / 1000;
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131
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132 /* Wrap the second if needed */
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133 if ( now.tv_usec >= 1000000 ) {
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134 now.tv_usec -= 1000000;
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135 now.tv_sec ++;
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136 }
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137
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138 /* Convert to timespec */
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139 ts_timeout.tv_sec = now.tv_sec;
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140 ts_timeout.tv_nsec = now.tv_usec * 1000;
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141
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142 /* Wait. */
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143 do {
5108
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144 retval = sem_timedwait(&sem->sem, &ts_timeout);
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145 } while (retval < 0 && errno == EINTR);
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146
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147 if (retval < 0) {
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148 SDL_SetError("sem_timedwait() failed");
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149 }
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150
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151 return retval;
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152 }
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153
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154 Uint32
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155 SDL_SemValue(SDL_sem * sem)
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156 {
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157 int ret = 0;
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158 if (sem) {
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159 sem_getvalue(&sem->sem, &ret);
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160 if (ret < 0) {
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161 ret = 0;
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162 }
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163 }
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164 return (Uint32) ret;
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165 }
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166
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167 int
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168 SDL_SemPost(SDL_sem * sem)
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169 {
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170 int retval;
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171
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172 if (!sem) {
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173 SDL_SetError("Passed a NULL semaphore");
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174 return -1;
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175 }
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176
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177 retval = sem_post(&sem->sem);
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178 if (retval < 0) {
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179 SDL_SetError("sem_post() failed");
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180 }
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181 return retval;
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182 }
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183
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184 #endif /* __MACOSX__ */
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185 /* vi: set ts=4 sw=4 expandtab: */