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annotate src/thread/pth/SDL_syscond.c @ 3294:470d0a416aa7

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Fixed bug #714 fuzzyTew@gmail.com 2009-03-14 15:18:45 PDT patch to change HAVE_ICONV to HAVE_ICONV_H There are two separate iconv checks in configure -- one for the header file and one for the library. include/SDL_stdinc.h uses the library define to see whether or not it should reference the types defined in the header, which naturally breaks if the library exists and the header does not.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 21 Sep 2009 11:04:01 +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: */