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annotate src/thread/pth/SDL_syscond.c @ 1635:92947e3a18db

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Make sure code is only compiled if the appropriate subsystem is enabled
author Sam Lantinga <slouken@libsdl.org>
date Fri, 14 Apr 2006 04:46:47 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
rev   line source
1402
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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
329
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24 /*
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25 * GNU pth conditions variables
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26 *
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27 * Patrice Mandin
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28 */
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29
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30 #include <pth.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 pth_cond_t condpth_p;
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38 };
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39
329
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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 ( pth_cond_init(&(cond->condpth_p)) < 0 ) {
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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 } else {
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53 SDL_OutOfMemory();
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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 SDL_DestroyCond(SDL_cond *cond)
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60 {
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61 if ( 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 ( pth_cond_notify(&(cond->condpth_p), FALSE) != 0 ) {
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78 SDL_SetError("pth_cond_notify() 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 ( pth_cond_notify(&(cond->condpth_p), TRUE) != 0 ) {
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96 SDL_SetError("pth_cond_notify() 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 /* Wait on the condition variable for at most 'ms' milliseconds.
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103 The mutex must be locked before entering this function!
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104 The mutex is unlocked during the wait, and locked again after the wait.
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105
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106 Typical use:
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107
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108 Thread A:
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109 SDL_LockMutex(lock);
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110 while ( ! condition ) {
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111 SDL_CondWait(cond);
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112 }
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113 SDL_UnlockMutex(lock);
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114
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115 Thread B:
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116 SDL_LockMutex(lock);
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117 ...
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118 condition = true;
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119 ...
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120 SDL_UnlockMutex(lock);
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121 */
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122 int SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms)
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123 {
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124 int retval;
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125 pth_event_t ev;
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126 int sec;
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127
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128 if ( ! cond ) {
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129 SDL_SetError("Passed a NULL condition variable");
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130 return -1;
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131 }
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132
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133 retval = 0;
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134
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135 sec = ms/1000;
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136 ev = pth_event(PTH_EVENT_TIME, pth_timeout(sec,(ms-sec*1000)*1000));
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137
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138 if ( pth_cond_await(&(cond->condpth_p), &(mutex->mutexpth_p), ev) != 0 ) {
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139 SDL_SetError("pth_cond_await() failed");
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140 retval = -1;
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141 }
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142
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143 pth_event_free(ev, PTH_FREE_ALL);
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144
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145 return retval;
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146 }
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147
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148 /* Wait on the condition variable forever */
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149 int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex)
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150 {
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151 int retval;
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152
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153 if ( ! cond ) {
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154 SDL_SetError("Passed a NULL condition variable");
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155 return -1;
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156 }
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157
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158 retval = 0;
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159 if ( pth_cond_await(&(cond->condpth_p), &(mutex->mutexpth_p), NULL) != 0 ) {
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160 SDL_SetError("pth_cond_await() failed");
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161 retval = -1;
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162 }
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163 return retval;
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164 }