annotate src/thread/pth/SDL_syscond.c @ 2842:97ba0be8b565

Date: Sat, 06 Dec 2008 15:27:00 +0100 From: Couriersud Subject: SDL: Relative mouse movements The patch below will reenable processing of relative mouse movements. The DirectFB drivers generates those in "grabbed" mode. These ensure, that even in fullscreen mode relative movements are reported. SDLMAME depends on this for games with trackballs. Looking at the code I ask myself whether relative movements should be handled in the drivers (x11, directfb). Both x11 and directfb are able to report relative movements. This would leave it to the driver to use the most appropriate method for relative movements when at the border of a fullscreen window or being "grabbed".
author Sam Lantinga <slouken@libsdl.org>
date Sat, 06 Dec 2008 17:50:50 +0000
parents c121d94672cb
children 99210400e8b9
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
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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: */