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annotate src/thread/pth/SDL_syscond.c @ 1525:23a347cfbed8

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Fixed bug #38 I'm using SDL 1.2.9 with Visual C++ 7.0 on Windows 2000. Here's the setup: my game starts in a window, with SDL_WM_GrabInput(SDL_GRAB_ON) to constrain the cursor to the game window. The mouse cursor is outside of the window when the game launches, and when the window appears the cursor is grabbed and placed at the top left corner of the inside of the game window. At this point, if I click the mouse without moving it, the SDL_MOUSEBUTTONDOWN event's mouse coordinates are (65535,65535).
author Sam Lantinga <slouken@libsdl.org>
date Tue, 14 Mar 2006 06:00:30 +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
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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 }