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annotate src/thread/riscos/SDL_syscond.c @ 1312:c9b51268668f

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Updated copyright information and removed rcs id lines (problematic in branch merges) I batch edited these files, so please let me know if I've accidentally removed anybody's credit here.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 01 Feb 2006 06:32:25 +0000
parents d74fbf56f2f6
children 3692456e7b0f
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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Sam Lantinga <slouken@libsdl.org>
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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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parents: 955
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6 modify it under the terms of the GNU Lesser General Public
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d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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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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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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c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges)
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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>
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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
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23 /* RISC OS implementations uses pthreads based on linux code */
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24
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25 #ifdef DISABLE_THREADS
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26 #include "../generic/SDL_syscond.c"
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27 #else
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28 #include <sys/time.h>
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29 #include <unistd.h>
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30 #include <errno.h>
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31 #include <stdlib.h>
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32 #include <pthread.h>
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33
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34 #include "SDL_error.h"
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35 #include "SDL_thread.h"
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36 #include "SDL_sysmutex_c.h"
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37
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38 struct SDL_cond
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39 {
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40 pthread_cond_t cond;
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41 };
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42
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43 /* Create a condition variable */
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44 SDL_cond * SDL_CreateCond(void)
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45 {
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46 SDL_cond *cond;
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47
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48 cond = (SDL_cond *) malloc(sizeof(SDL_cond));
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49 if ( cond ) {
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50 if ( pthread_cond_init(&cond->cond, NULL) < 0 ) {
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51 SDL_SetError("pthread_cond_init() failed");
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52 free(cond);
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53 cond = NULL;
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54 }
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55 }
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56 return(cond);
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57 }
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58
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59 /* Destroy a condition variable */
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60 void SDL_DestroyCond(SDL_cond *cond)
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61 {
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62 if ( cond ) {
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63 pthread_cond_destroy(&cond->cond);
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64 free(cond);
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65 }
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66 }
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67
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68 /* Restart one of the threads that are waiting on the condition variable */
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69 int SDL_CondSignal(SDL_cond *cond)
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70 {
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71 int retval;
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72
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73 if ( ! cond ) {
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74 SDL_SetError("Passed a NULL condition variable");
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75 return -1;
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76 }
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77
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78 retval = 0;
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79 if ( pthread_cond_signal(&cond->cond) != 0 ) {
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80 SDL_SetError("pthread_cond_signal() failed");
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81 retval = -1;
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82 }
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83 return retval;
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84 }
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85
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86 /* Restart all threads that are waiting on the condition variable */
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87 int SDL_CondBroadcast(SDL_cond *cond)
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88 {
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89 int retval;
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90
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91 if ( ! cond ) {
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92 SDL_SetError("Passed a NULL condition variable");
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93 return -1;
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94 }
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95
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96 retval = 0;
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97 if ( pthread_cond_broadcast(&cond->cond) != 0 ) {
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98 SDL_SetError("pthread_cond_broadcast() failed");
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99 retval = -1;
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100 }
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101 return retval;
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102 }
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103
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104 int SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms)
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105 {
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106 int retval;
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107 struct timeval delta;
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108 struct timespec abstime;
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109
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110 if ( ! cond ) {
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111 SDL_SetError("Passed a NULL condition variable");
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112 return -1;
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113 }
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114
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115 gettimeofday(&delta, NULL);
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116
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117 abstime.tv_sec = delta.tv_sec + (ms/1000);
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118 abstime.tv_nsec = (delta.tv_usec + (ms%1000) * 1000) * 1000;
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119 if ( abstime.tv_nsec > 1000000000 ) {
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120 abstime.tv_sec += 1;
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121 abstime.tv_nsec -= 1000000000;
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122 }
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123
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124 tryagain:
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125 retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime);
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126 switch (retval) {
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127 case EINTR:
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128 goto tryagain;
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129 break;
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130 case ETIMEDOUT:
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131 retval = SDL_MUTEX_TIMEDOUT;
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132 break;
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133 case 0:
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134 break;
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135 default:
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136 SDL_SetError("pthread_cond_timedwait() failed");
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137 retval = -1;
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138 break;
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139 }
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140 return retval;
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141 }
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142
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143 /* Wait on the condition variable, unlocking the provided mutex.
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144 The mutex must be locked before entering this function!
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145 */
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146 int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex)
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147 {
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148 int retval;
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149
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150 if ( ! cond ) {
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151 SDL_SetError("Passed a NULL condition variable");
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152 return -1;
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153 }
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154
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155 retval = 0;
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156 if ( pthread_cond_wait(&cond->cond, &mutex->id) != 0 ) {
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157 SDL_SetError("pthread_cond_wait() failed");
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158 retval = -1;
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159 }
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160 return retval;
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161 }
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162 #endif