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annotate src/thread/riscos/SDL_syscond.c @ 4301:5007e6a66814 SDL-1.2

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Debian patch: 209_alsa_priority.diff
author Sam Lantinga <slouken@libsdl.org>
date Sat, 10 Oct 2009 09:07:51 +0000
parents a1b03ba2fcd0
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) 1997-2009 Sam Lantinga
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4
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Sam Lantinga <slouken@libsdl.org>
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5 This library is free software; you can redistribute it and/or
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parents: 955
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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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c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges)
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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
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges)
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parents: 955
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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
c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents: 955
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16 License along with this library; if not, write to the Free Software
c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges)
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parents: 955
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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 /* RISC OS implementations uses pthreads based on linux code */
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25
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26 #if SDL_THREADS_DISABLED
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27 #include "../generic/SDL_syscond.c"
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28 #else
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29 #include <sys/time.h>
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30 #include <unistd.h>
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31 #include <pthread.h>
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32
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33 #include "SDL_thread.h"
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34 #include "SDL_sysmutex_c.h"
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35
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36 struct SDL_cond
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37 {
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38 pthread_cond_t cond;
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39 };
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40
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41 /* Create a condition variable */
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42 SDL_cond * SDL_CreateCond(void)
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43 {
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44 SDL_cond *cond;
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45
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46 cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
955
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47 if ( cond ) {
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48 if ( pthread_cond_init(&cond->cond, NULL) < 0 ) {
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49 SDL_SetError("pthread_cond_init() failed");
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50 SDL_free(cond);
955
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51 cond = NULL;
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52 }
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53 }
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Sam Lantinga <slouken@libsdl.org>
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54 return(cond);
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55 }
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56
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57 /* Destroy a condition variable */
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58 void SDL_DestroyCond(SDL_cond *cond)
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59 {
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60 if ( cond ) {
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61 pthread_cond_destroy(&cond->cond);
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62 SDL_free(cond);
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63 }
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64 }
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65
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66 /* Restart one of the threads that are waiting on the condition variable */
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67 int SDL_CondSignal(SDL_cond *cond)
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68 {
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69 int retval;
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70
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71 if ( ! cond ) {
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72 SDL_SetError("Passed a NULL condition variable");
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73 return -1;
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74 }
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75
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76 retval = 0;
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77 if ( pthread_cond_signal(&cond->cond) != 0 ) {
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78 SDL_SetError("pthread_cond_signal() failed");
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79 retval = -1;
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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 /* Restart all threads that are waiting on the condition variable */
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85 int SDL_CondBroadcast(SDL_cond *cond)
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86 {
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87 int retval;
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88
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89 if ( ! cond ) {
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90 SDL_SetError("Passed a NULL condition variable");
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91 return -1;
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92 }
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93
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94 retval = 0;
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95 if ( pthread_cond_broadcast(&cond->cond) != 0 ) {
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96 SDL_SetError("pthread_cond_broadcast() failed");
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97 retval = -1;
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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 SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms)
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103 {
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104 int retval;
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105 struct timeval delta;
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106 struct timespec abstime;
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107
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108 if ( ! cond ) {
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109 SDL_SetError("Passed a NULL condition variable");
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110 return -1;
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111 }
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112
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113 gettimeofday(&delta, NULL);
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114
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115 abstime.tv_sec = delta.tv_sec + (ms/1000);
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116 abstime.tv_nsec = (delta.tv_usec + (ms%1000) * 1000) * 1000;
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117 if ( abstime.tv_nsec > 1000000000 ) {
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118 abstime.tv_sec += 1;
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119 abstime.tv_nsec -= 1000000000;
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120 }
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121
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122 tryagain:
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123 retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime);
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124 switch (retval) {
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125 case EINTR:
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126 goto tryagain;
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127 break;
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128 case ETIMEDOUT:
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129 retval = SDL_MUTEX_TIMEDOUT;
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130 break;
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131 case 0:
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132 break;
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133 default:
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134 SDL_SetError("pthread_cond_timedwait() failed");
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135 retval = -1;
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136 break;
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137 }
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138 return retval;
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139 }
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140
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141 /* Wait on the condition variable, unlocking the provided mutex.
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142 The mutex must be locked before entering this function!
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143 */
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144 int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex)
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145 {
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146 int retval;
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147
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148 if ( ! cond ) {
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149 SDL_SetError("Passed a NULL condition variable");
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150 return -1;
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151 }
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152
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153 retval = 0;
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154 if ( pthread_cond_wait(&cond->cond, &mutex->id) != 0 ) {
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155 SDL_SetError("pthread_cond_wait() failed");
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156 retval = -1;
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157 }
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158 return retval;
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159 }
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160 #endif