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annotate src/thread/pthread/SDL_syscond.c @ 4094:ca992789c798 SDL-1.2

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ANSI C fix (all variables need to be defined at start of block). Fixes Bugzilla #487.
author Ryan C. Gordon <icculus@icculus.org>
date Sat, 01 Sep 2007 17:25:24 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
rev   line source
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
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1 /*
19418e4422cb New configure-based build system. Still work in progress, but much improved
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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
19418e4422cb New configure-based build system. Still work in progress, but much improved
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5 This library is free software; you can redistribute it and/or
19418e4422cb New configure-based build system. Still work in progress, but much improved
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6 modify it under the terms of the GNU Lesser General Public
19418e4422cb New configure-based build system. Still work in progress, but much improved
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7 License as published by the Free Software Foundation; either
19418e4422cb New configure-based build system. Still work in progress, but much improved
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8 version 2.1 of the License, or (at your option) any later version.
19418e4422cb New configure-based build system. Still work in progress, but much improved
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9
19418e4422cb New configure-based build system. Still work in progress, but much improved
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10 This library is distributed in the hope that it will be useful,
19418e4422cb New configure-based build system. Still work in progress, but much improved
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
19418e4422cb New configure-based build system. Still work in progress, but much improved
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19418e4422cb New configure-based build system. Still work in progress, but much improved
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13 Lesser General Public License for more details.
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14
19418e4422cb New configure-based build system. Still work in progress, but much improved
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15 You should have received a copy of the GNU Lesser General Public
19418e4422cb New configure-based build system. Still work in progress, but much improved
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16 License along with this library; if not, write to the Free Software
19418e4422cb New configure-based build system. Still work in progress, but much improved
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
19418e4422cb New configure-based build system. Still work in progress, but much improved
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
1402
d910939febfa Use consistent identifiers for the various platforms we support.
Sam Lantinga <slouken@libsdl.org>
parents: 1361
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22 #include "SDL_config.h"
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
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23
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24 #include <sys/time.h>
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25 #include <unistd.h>
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26 #include <errno.h>
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27 #include <pthread.h>
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28
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29 #include "SDL_thread.h"
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30 #include "SDL_sysmutex_c.h"
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31
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32 struct SDL_cond
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33 {
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34 pthread_cond_t cond;
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35 };
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36
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37 /* Create a condition variable */
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38 SDL_cond * SDL_CreateCond(void)
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39 {
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40 SDL_cond *cond;
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41
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42 cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
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43 if ( cond ) {
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44 if ( pthread_cond_init(&cond->cond, NULL) < 0 ) {
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45 SDL_SetError("pthread_cond_init() failed");
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46 SDL_free(cond);
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47 cond = NULL;
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48 }
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49 }
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50 return(cond);
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51 }
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52
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53 /* Destroy a condition variable */
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54 void SDL_DestroyCond(SDL_cond *cond)
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55 {
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56 if ( cond ) {
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57 pthread_cond_destroy(&cond->cond);
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58 SDL_free(cond);
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59 }
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60 }
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61
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62 /* Restart one of the threads that are waiting on the condition variable */
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63 int SDL_CondSignal(SDL_cond *cond)
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64 {
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65 int retval;
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66
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67 if ( ! cond ) {
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68 SDL_SetError("Passed a NULL condition variable");
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69 return -1;
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70 }
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71
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72 retval = 0;
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73 if ( pthread_cond_signal(&cond->cond) != 0 ) {
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74 SDL_SetError("pthread_cond_signal() failed");
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75 retval = -1;
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76 }
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77 return retval;
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78 }
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79
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80 /* Restart all threads that are waiting on the condition variable */
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81 int SDL_CondBroadcast(SDL_cond *cond)
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82 {
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83 int retval;
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84
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85 if ( ! cond ) {
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86 SDL_SetError("Passed a NULL condition variable");
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87 return -1;
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88 }
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89
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90 retval = 0;
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91 if ( pthread_cond_broadcast(&cond->cond) != 0 ) {
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92 SDL_SetError("pthread_cond_broadcast() failed");
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93 retval = -1;
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94 }
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95 return retval;
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96 }
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97
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98 int SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms)
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99 {
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100 int retval;
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101 struct timeval delta;
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102 struct timespec abstime;
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103
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104 if ( ! cond ) {
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105 SDL_SetError("Passed a NULL condition variable");
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106 return -1;
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107 }
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108
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109 gettimeofday(&delta, NULL);
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110
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111 abstime.tv_sec = delta.tv_sec + (ms/1000);
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112 abstime.tv_nsec = (delta.tv_usec + (ms%1000) * 1000) * 1000;
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113 if ( abstime.tv_nsec > 1000000000 ) {
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114 abstime.tv_sec += 1;
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115 abstime.tv_nsec -= 1000000000;
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116 }
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117
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118 tryagain:
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119 retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime);
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120 switch (retval) {
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121 case EINTR:
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122 goto tryagain;
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123 break;
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124 case ETIMEDOUT:
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125 retval = SDL_MUTEX_TIMEDOUT;
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126 break;
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127 case 0:
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128 break;
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129 default:
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130 SDL_SetError("pthread_cond_timedwait() failed");
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131 retval = -1;
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132 break;
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133 }
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134 return retval;
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135 }
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136
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137 /* Wait on the condition variable, unlocking the provided mutex.
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138 The mutex must be locked before entering this function!
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139 */
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140 int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex)
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141 {
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142 int retval;
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143
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144 if ( ! cond ) {
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145 SDL_SetError("Passed a NULL condition variable");
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146 return -1;
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147 }
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148
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149 retval = 0;
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150 if ( pthread_cond_wait(&cond->cond, &mutex->id) != 0 ) {
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151 SDL_SetError("pthread_cond_wait() failed");
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152 retval = -1;
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153 }
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154 return retval;
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155 }