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annotate src/thread/riscos/SDL_syscond.c @ 1365:b70f45aa5d0c

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Add missing clause
author Patrice Mandin <patmandin@gmail.com>
date Thu, 16 Feb 2006 22:33:34 +0000
parents 19418e4422cb
children d910939febfa
rev   line source
955
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Sam Lantinga <slouken@libsdl.org>
parents:
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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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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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Sam Lantinga <slouken@libsdl.org>
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
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23 /* RISC OS implementations uses pthreads based on linux code */
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24
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25 #if SDL_THREADS_DISABLED
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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 <pthread.h>
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31
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32 #include "SDL_thread.h"
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33 #include "SDL_sysmutex_c.h"
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34
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35 struct SDL_cond
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36 {
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37 pthread_cond_t cond;
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38 };
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39
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40 /* Create a condition variable */
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41 SDL_cond * SDL_CreateCond(void)
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42 {
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43 SDL_cond *cond;
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44
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45 cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
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46 if ( cond ) {
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47 if ( pthread_cond_init(&cond->cond, NULL) < 0 ) {
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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48 SDL_SetError("pthread_cond_init() failed");
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49 SDL_free(cond);
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50 cond = NULL;
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51 }
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52 }
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Sam Lantinga <slouken@libsdl.org>
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53 return(cond);
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54 }
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55
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56 /* Destroy a condition variable */
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57 void SDL_DestroyCond(SDL_cond *cond)
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58 {
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59 if ( cond ) {
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60 pthread_cond_destroy(&cond->cond);
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61 SDL_free(cond);
955
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62 }
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63 }
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64
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65 /* Restart one of the threads that are waiting on the condition variable */
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66 int SDL_CondSignal(SDL_cond *cond)
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67 {
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68 int retval;
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69
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70 if ( ! cond ) {
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71 SDL_SetError("Passed a NULL condition variable");
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72 return -1;
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73 }
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74
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75 retval = 0;
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76 if ( pthread_cond_signal(&cond->cond) != 0 ) {
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77 SDL_SetError("pthread_cond_signal() failed");
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78 retval = -1;
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79 }
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80 return retval;
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81 }
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82
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83 /* Restart all threads that are waiting on the condition variable */
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84 int SDL_CondBroadcast(SDL_cond *cond)
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85 {
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86 int retval;
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87
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88 if ( ! cond ) {
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89 SDL_SetError("Passed a NULL condition variable");
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90 return -1;
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91 }
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92
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93 retval = 0;
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94 if ( pthread_cond_broadcast(&cond->cond) != 0 ) {
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95 SDL_SetError("pthread_cond_broadcast() failed");
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96 retval = -1;
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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 SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms)
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102 {
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103 int retval;
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104 struct timeval delta;
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105 struct timespec abstime;
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106
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107 if ( ! cond ) {
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108 SDL_SetError("Passed a NULL condition variable");
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109 return -1;
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110 }
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111
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112 gettimeofday(&delta, NULL);
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113
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114 abstime.tv_sec = delta.tv_sec + (ms/1000);
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115 abstime.tv_nsec = (delta.tv_usec + (ms%1000) * 1000) * 1000;
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116 if ( abstime.tv_nsec > 1000000000 ) {
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117 abstime.tv_sec += 1;
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118 abstime.tv_nsec -= 1000000000;
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119 }
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120
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121 tryagain:
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122 retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime);
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123 switch (retval) {
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124 case EINTR:
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125 goto tryagain;
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126 break;
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127 case ETIMEDOUT:
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128 retval = SDL_MUTEX_TIMEDOUT;
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129 break;
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130 case 0:
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131 break;
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132 default:
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133 SDL_SetError("pthread_cond_timedwait() failed");
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134 retval = -1;
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135 break;
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136 }
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137 return retval;
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138 }
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139
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140 /* Wait on the condition variable, unlocking the provided mutex.
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141 The mutex must be locked before entering this function!
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142 */
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143 int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex)
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144 {
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145 int retval;
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146
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147 if ( ! cond ) {
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148 SDL_SetError("Passed a NULL condition variable");
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149 return -1;
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150 }
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151
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152 retval = 0;
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153 if ( pthread_cond_wait(&cond->cond, &mutex->id) != 0 ) {
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154 SDL_SetError("pthread_cond_wait() failed");
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155 retval = -1;
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156 }
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157 return retval;
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158 }
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159 #endif