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annotate src/thread/riscos/SDL_syscond.c @ 1692:75f2ace8511a SDL-1.3

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Bug #250, pkg-config support contributed by Mikael Eriksson
author Sam Lantinga <slouken@libsdl.org>
date Tue, 20 Jun 2006 05:50:12 +0000
parents 4da1ee79c9af
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) 1997-2006 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 /* 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 *
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43 SDL_CreateCond(void)
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44 {
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45 SDL_cond *cond;
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46
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47 cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
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48 if (cond) {
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49 if (pthread_cond_init(&cond->cond, NULL) < 0) {
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50 SDL_SetError("pthread_cond_init() failed");
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51 SDL_free(cond);
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52 cond = NULL;
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53 }
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54 }
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55 return (cond);
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56 }
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57
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58 /* Destroy a condition variable */
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59 void
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60 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 SDL_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
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70 SDL_CondSignal(SDL_cond * cond)
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71 {
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72 int retval;
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73
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74 if (!cond) {
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75 SDL_SetError("Passed a NULL condition variable");
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76 return -1;
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77 }
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78
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79 retval = 0;
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80 if (pthread_cond_signal(&cond->cond) != 0) {
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81 SDL_SetError("pthread_cond_signal() failed");
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82 retval = -1;
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83 }
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84 return retval;
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85 }
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86
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87 /* Restart all threads that are waiting on the condition variable */
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88 int
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89 SDL_CondBroadcast(SDL_cond * cond)
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90 {
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91 int retval;
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92
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93 if (!cond) {
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94 SDL_SetError("Passed a NULL condition variable");
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95 return -1;
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96 }
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97
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98 retval = 0;
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99 if (pthread_cond_broadcast(&cond->cond) != 0) {
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100 SDL_SetError("pthread_cond_broadcast() failed");
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101 retval = -1;
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102 }
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103 return retval;
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104 }
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105
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106 int
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107 SDL_CondWaitTimeout(SDL_cond * cond, SDL_mutex * mutex, Uint32 ms)
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108 {
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109 int retval;
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110 struct timeval delta;
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111 struct timespec abstime;
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112
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113 if (!cond) {
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114 SDL_SetError("Passed a NULL condition variable");
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115 return -1;
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116 }
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117
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118 gettimeofday(&delta, NULL);
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119
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120 abstime.tv_sec = delta.tv_sec + (ms / 1000);
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121 abstime.tv_nsec = (delta.tv_usec + (ms % 1000) * 1000) * 1000;
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122 if (abstime.tv_nsec > 1000000000) {
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123 abstime.tv_sec += 1;
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124 abstime.tv_nsec -= 1000000000;
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125 }
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126
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127 tryagain:
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128 retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime);
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129 switch (retval) {
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130 case EINTR:
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131 goto tryagain;
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132 break;
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133 case ETIMEDOUT:
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134 retval = SDL_MUTEX_TIMEDOUT;
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135 break;
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136 case 0:
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137 break;
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138 default:
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139 SDL_SetError("pthread_cond_timedwait() failed");
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140 retval = -1;
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141 break;
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142 }
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143 return retval;
955
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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144 }
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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145
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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146 /* Wait on the condition variable, unlocking the provided mutex.
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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147 The mutex must be locked before entering this function!
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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148 */
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149 int
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150 SDL_CondWait(SDL_cond * cond, SDL_mutex * mutex)
955
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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151 {
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152 int retval;
955
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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153
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154 if (!cond) {
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155 SDL_SetError("Passed a NULL condition variable");
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156 return -1;
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157 }
955
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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158
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159 retval = 0;
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160 if (pthread_cond_wait(&cond->cond, &mutex->id) != 0) {
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161 SDL_SetError("pthread_cond_wait() failed");
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162 retval = -1;
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163 }
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164 return retval;
955
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
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165 }
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
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diff changeset
166 #endif
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167 /* vi: set ts=4 sw=4 expandtab: */