Mercurial > sdl-ios-xcode

annotate src/thread/pthread/SDL_syssem.c @ 2697:c9121b04cffa gsoc2008_nds

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Some more work on the audio driver.
author Darren Alton <dalton@stevens.edu>
date Thu, 21 Aug 2008 12:38:21 +0000
parents e27bdcc80744
children f55c87ae336b
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 #include <pthread.h>
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25 #include <semaphore.h>
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26
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27 #include "SDL_thread.h"
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28 #include "SDL_timer.h"
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29
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30 /* Wrapper around POSIX 1003.1b semaphores */
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31
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32 #ifdef __MACOSX__
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33 /* Mac OS X doesn't support sem_getvalue() as of version 10.4 */
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34 #include "../generic/SDL_syssem.c"
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35 #else
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36
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37 struct SDL_semaphore
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38 {
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39 sem_t sem;
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40 };
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41
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42 /* Create a semaphore, initialized with value */
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43 SDL_sem *
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44 SDL_CreateSemaphore(Uint32 initial_value)
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45 {
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46 SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem));
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47 if (sem) {
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48 if (sem_init(&sem->sem, 0, initial_value) < 0) {
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49 SDL_SetError("sem_init() failed");
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50 SDL_free(sem);
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51 sem = NULL;
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52 }
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53 } else {
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54 SDL_OutOfMemory();
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55 }
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56 return sem;
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57 }
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58
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59 void
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60 SDL_DestroySemaphore(SDL_sem * sem)
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61 {
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62 if (sem) {
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63 sem_destroy(&sem->sem);
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64 SDL_free(sem);
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65 }
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66 }
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67
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68 int
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69 SDL_SemTryWait(SDL_sem * sem)
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70 {
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71 int retval;
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72
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73 if (!sem) {
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74 SDL_SetError("Passed a NULL semaphore");
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75 return -1;
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76 }
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77 retval = SDL_MUTEX_TIMEDOUT;
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78 if (sem_trywait(&sem->sem) == 0) {
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79 retval = 0;
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80 }
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81 return retval;
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82 }
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83
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84 int
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85 SDL_SemWait(SDL_sem * sem)
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86 {
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87 int retval;
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88
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89 if (!sem) {
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90 SDL_SetError("Passed a NULL semaphore");
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91 return -1;
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92 }
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93
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94 retval = sem_wait(&sem->sem);
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95 if (retval < 0) {
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96 SDL_SetError("sem_wait() failed");
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97 }
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98 return retval;
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99 }
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100
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101 int
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102 SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
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103 {
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104 int retval;
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105
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106 if (!sem) {
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107 SDL_SetError("Passed a NULL semaphore");
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108 return -1;
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109 }
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110
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111 /* Try the easy cases first */
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112 if (timeout == 0) {
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113 return SDL_SemTryWait(sem);
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114 }
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115 if (timeout == SDL_MUTEX_MAXWAIT) {
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116 return SDL_SemWait(sem);
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117 }
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118
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119 /* Ack! We have to busy wait... */
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120 /* FIXME: Use sem_timedwait()? */
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121 timeout += SDL_GetTicks();
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122 do {
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123 retval = SDL_SemTryWait(sem);
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124 if (retval == 0) {
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125 break;
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126 }
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127 SDL_Delay(1);
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128 } while (SDL_GetTicks() < timeout);
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129
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130 return retval;
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131 }
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132
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133 Uint32
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134 SDL_SemValue(SDL_sem * sem)
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135 {
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136 int ret = 0;
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137 if (sem) {
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138 sem_getvalue(&sem->sem, &ret);
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139 if (ret < 0) {
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140 ret = 0;
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141 }
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142 }
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143 return (Uint32) ret;
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144 }
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145
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146 int
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147 SDL_SemPost(SDL_sem * sem)
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148 {
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149 int retval;
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150
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151 if (!sem) {
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152 SDL_SetError("Passed a NULL semaphore");
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153 return -1;
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154 }
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155
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156 retval = sem_post(&sem->sem);
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157 if (retval < 0) {
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158 SDL_SetError("sem_post() failed");
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159 }
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160 return retval;
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161 }
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162
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163 #endif /* __MACOSX__ */
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164 /* vi: set ts=4 sw=4 expandtab: */