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annotate src/thread/pth/SDL_syscond.c @ 3562:59ab35254459

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Need to test the multi-draw APIs
author Sam Lantinga <slouken@libsdl.org>
date Tue, 15 Dec 2009 00:00:30 +0000
parents 99210400e8b9
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) 1997-2009 Sam Lantinga
1402
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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 /*
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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
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40 /* Create a condition variable */
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41 SDL_cond *
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42 SDL_CreateCond(void)
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43 {
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44 SDL_cond *cond;
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45
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46 cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
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47 if (cond) {
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48 if (pth_cond_init(&(cond->condpth_p)) < 0) {
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49 SDL_SetError("pthread_cond_init() failed");
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50 SDL_free(cond);
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51 cond = NULL;
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52 }
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53 } else {
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54 SDL_OutOfMemory();
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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
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61 SDL_DestroyCond(SDL_cond * cond)
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62 {
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63 if (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 (pth_cond_notify(&(cond->condpth_p), FALSE) != 0) {
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81 SDL_SetError("pth_cond_notify() 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 (pth_cond_notify(&(cond->condpth_p), TRUE) != 0) {
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100 SDL_SetError("pth_cond_notify() 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 /* Wait on the condition variable for at most 'ms' milliseconds.
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107 The mutex must be locked before entering this function!
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108 The mutex is unlocked during the wait, and locked again after the wait.
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109
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110 Typical use:
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111
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112 Thread A:
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113 SDL_LockMutex(lock);
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114 while ( ! condition ) {
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115 SDL_CondWait(cond);
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116 }
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117 SDL_UnlockMutex(lock);
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118
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119 Thread B:
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120 SDL_LockMutex(lock);
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121 ...
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122 condition = true;
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123 ...
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124 SDL_UnlockMutex(lock);
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125 */
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126 int
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127 SDL_CondWaitTimeout(SDL_cond * cond, SDL_mutex * mutex, Uint32 ms)
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128 {
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129 int retval;
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130 pth_event_t ev;
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131 int sec;
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132
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133 if (!cond) {
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134 SDL_SetError("Passed a NULL condition variable");
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135 return -1;
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136 }
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137
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138 retval = 0;
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139
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140 sec = ms / 1000;
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141 ev = pth_event(PTH_EVENT_TIME,
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142 pth_timeout(sec, (ms - sec * 1000) * 1000));
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143
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144 if (pth_cond_await(&(cond->condpth_p), &(mutex->mutexpth_p), ev) != 0) {
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145 SDL_SetError("pth_cond_await() failed");
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146 retval = -1;
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147 }
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148
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149 pth_event_free(ev, PTH_FREE_ALL);
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150
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151 return retval;
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152 }
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153
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154 /* Wait on the condition variable forever */
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155 int
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156 SDL_CondWait(SDL_cond * cond, SDL_mutex * mutex)
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157 {
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158 int retval;
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159
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160 if (!cond) {
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161 SDL_SetError("Passed a NULL condition variable");
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162 return -1;
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163 }
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164
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165 retval = 0;
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166 if (pth_cond_await(&(cond->condpth_p), &(mutex->mutexpth_p), NULL) != 0) {
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167 SDL_SetError("pth_cond_await() failed");
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168 retval = -1;
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169 }
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170 return retval;
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171 }
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172
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173 /* vi: set ts=4 sw=4 expandtab: */