Mercurial > sdl-ios-xcode
annotate src/thread/dc/SDL_syscond.c @ 914:bbf8dcc8aed6
Date: Wed, 23 Jun 2004 17:05:33 -0400
From: Chris Nelson
Subject: [SDL] [Patch] WiseGroup MP-8800 / MP-8866 (PS2 Joystick)
In the current cvs version, SDL doesn't handle these Playstation2
controller => USB adapters correctly, in linux.
It will always assume that the maximum number of joysticks (2 in the
case of the MP-8866, 4 in the case of the 8800) are plugged in. This is
bad not only because it allows SDL to exaggerate the number of logical
joysticks, but primarily because the joystick axes are mapped
incorrectly, all over the place, such that the devices are effectively
unusable unless you have the maximum number of joysticks plugged in.
My changes to src/joystick/linux/SDL_sysjoystick.c build on another's
previous work (which was a special case for this very joystick,
actually), and fix both of these problems, as well as making the current
code a little more general, to allow for others to more easily drop in
code for quirky joysticks such as these.
I've tested this code under 2.6.7 as well as 2.4.24... Both work as
advertised (provided you load the JOYDEV linux code as a module,
otherwise they won't work at all, new code or old, but that's another
issue entirely).
Though this sounds horribly formal, you have my permission to distribute
all of my work on this issue under the LGPL. So there.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 25 Jul 2004 18:31:50 +0000 |
parents | b8d311d90021 |
children | c9b51268668f |
rev | line source |
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509
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1 /* |
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2 SDL - Simple DirectMedia Layer |
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509
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3 Copyright (C) 1997-2004 Sam Lantinga |
509
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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 Library General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2 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 Library 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 Library General Public |
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16 License along with this library; if not, write to the Free |
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 |
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23 #ifdef SAVE_RCSID |
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24 static char rcsid = |
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25 "@(#) $Id$"; |
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26 #endif |
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27 |
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28 /* An implementation of condition variables using semaphores and mutexes */ |
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29 /* |
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30 This implementation borrows heavily from the BeOS condition variable |
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31 implementation, written by Christopher Tate and Owen Smith. Thanks! |
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32 */ |
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33 |
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34 #include <stdio.h> |
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35 #include <stdlib.h> |
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36 |
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37 #include "SDL_error.h" |
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38 #include "SDL_thread.h" |
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39 |
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40 struct SDL_cond |
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41 { |
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42 SDL_mutex *lock; |
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43 int waiting; |
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44 int signals; |
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45 SDL_sem *wait_sem; |
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46 SDL_sem *wait_done; |
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47 }; |
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48 |
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49 /* Create a condition variable */ |
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50 SDL_cond * SDL_CreateCond(void) |
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51 { |
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52 SDL_cond *cond; |
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53 |
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54 cond = (SDL_cond *) malloc(sizeof(SDL_cond)); |
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55 if ( cond ) { |
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56 cond->lock = SDL_CreateMutex(); |
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57 cond->wait_sem = SDL_CreateSemaphore(0); |
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58 cond->wait_done = SDL_CreateSemaphore(0); |
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59 cond->waiting = cond->signals = 0; |
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60 if ( ! cond->lock || ! cond->wait_sem || ! cond->wait_done ) { |
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61 SDL_DestroyCond(cond); |
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62 cond = NULL; |
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63 } |
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64 } else { |
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65 SDL_OutOfMemory(); |
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66 } |
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67 return(cond); |
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68 } |
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69 |
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70 /* Destroy a condition variable */ |
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71 void SDL_DestroyCond(SDL_cond *cond) |
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72 { |
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73 if ( cond ) { |
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74 if ( cond->wait_sem ) { |
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75 SDL_DestroySemaphore(cond->wait_sem); |
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76 } |
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77 if ( cond->wait_done ) { |
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78 SDL_DestroySemaphore(cond->wait_done); |
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79 } |
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80 if ( cond->lock ) { |
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81 SDL_DestroyMutex(cond->lock); |
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82 } |
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83 free(cond); |
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84 } |
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85 } |
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86 |
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87 /* Restart one of the threads that are waiting on the condition variable */ |
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88 int SDL_CondSignal(SDL_cond *cond) |
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89 { |
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90 if ( ! cond ) { |
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91 SDL_SetError("Passed a NULL condition variable"); |
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92 return -1; |
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93 } |
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94 |
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95 /* If there are waiting threads not already signalled, then |
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96 signal the condition and wait for the thread to respond. |
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97 */ |
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98 SDL_LockMutex(cond->lock); |
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99 if ( cond->waiting > cond->signals ) { |
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100 ++cond->signals; |
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101 SDL_SemPost(cond->wait_sem); |
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102 SDL_UnlockMutex(cond->lock); |
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103 SDL_SemWait(cond->wait_done); |
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104 } else { |
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105 SDL_UnlockMutex(cond->lock); |
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106 } |
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107 |
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108 return 0; |
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109 } |
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110 |
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111 /* Restart all threads that are waiting on the condition variable */ |
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112 int SDL_CondBroadcast(SDL_cond *cond) |
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113 { |
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114 if ( ! cond ) { |
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115 SDL_SetError("Passed a NULL condition variable"); |
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116 return -1; |
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117 } |
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118 |
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119 /* If there are waiting threads not already signalled, then |
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120 signal the condition and wait for the thread to respond. |
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121 */ |
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122 SDL_LockMutex(cond->lock); |
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123 if ( cond->waiting > cond->signals ) { |
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124 int i, num_waiting; |
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125 |
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126 num_waiting = (cond->waiting - cond->signals); |
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127 cond->signals = cond->waiting; |
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128 for ( i=0; i<num_waiting; ++i ) { |
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129 SDL_SemPost(cond->wait_sem); |
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130 } |
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131 /* Now all released threads are blocked here, waiting for us. |
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132 Collect them all (and win fabulous prizes!) :-) |
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133 */ |
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134 SDL_UnlockMutex(cond->lock); |
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135 for ( i=0; i<num_waiting; ++i ) { |
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136 SDL_SemWait(cond->wait_done); |
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137 } |
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138 } else { |
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139 SDL_UnlockMutex(cond->lock); |
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140 } |
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141 |
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142 return 0; |
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143 } |
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144 |
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145 /* Wait on the condition variable for at most 'ms' milliseconds. |
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146 The mutex must be locked before entering this function! |
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147 The mutex is unlocked during the wait, and locked again after the wait. |
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148 |
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149 Typical use: |
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150 |
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151 Thread A: |
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152 SDL_LockMutex(lock); |
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153 while ( ! condition ) { |
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154 SDL_CondWait(cond); |
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155 } |
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156 SDL_UnlockMutex(lock); |
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157 |
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158 Thread B: |
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159 SDL_LockMutex(lock); |
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160 ... |
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161 condition = true; |
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162 ... |
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163 SDL_UnlockMutex(lock); |
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164 */ |
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165 int SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms) |
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166 { |
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167 int retval; |
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168 |
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169 if ( ! cond ) { |
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170 SDL_SetError("Passed a NULL condition variable"); |
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171 return -1; |
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172 } |
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173 |
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174 /* Obtain the protection mutex, and increment the number of waiters. |
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175 This allows the signal mechanism to only perform a signal if there |
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176 are waiting threads. |
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177 */ |
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178 SDL_LockMutex(cond->lock); |
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179 ++cond->waiting; |
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180 SDL_UnlockMutex(cond->lock); |
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181 |
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182 /* Unlock the mutex, as is required by condition variable semantics */ |
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183 SDL_UnlockMutex(mutex); |
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184 |
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185 /* Wait for a signal */ |
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186 if ( ms == SDL_MUTEX_MAXWAIT ) { |
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187 retval = SDL_SemWait(cond->wait_sem); |
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188 } else { |
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189 retval = SDL_SemWaitTimeout(cond->wait_sem, ms); |
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190 } |
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191 |
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192 /* Let the signaler know we have completed the wait, otherwise |
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193 the signaler can race ahead and get the condition semaphore |
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194 if we are stopped between the mutex unlock and semaphore wait, |
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195 giving a deadlock. See the following URL for details: |
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196 http://www-classic.be.com/aboutbe/benewsletter/volume_III/Issue40.html |
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197 */ |
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198 SDL_LockMutex(cond->lock); |
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199 if ( cond->signals > 0 ) { |
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200 /* If we timed out, we need to eat a condition signal */ |
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201 if ( retval > 0 ) { |
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202 SDL_SemWait(cond->wait_sem); |
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203 } |
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204 /* We always notify the signal thread that we are done */ |
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205 SDL_SemPost(cond->wait_done); |
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206 |
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207 /* Signal handshake complete */ |
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208 --cond->signals; |
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209 } |
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210 --cond->waiting; |
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211 SDL_UnlockMutex(cond->lock); |
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212 |
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213 /* Lock the mutex, as is required by condition variable semantics */ |
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214 SDL_LockMutex(mutex); |
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215 |
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216 return retval; |
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217 } |
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218 |
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219 /* Wait on the condition variable forever */ |
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220 int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex) |
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221 { |
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222 return SDL_CondWaitTimeout(cond, mutex, SDL_MUTEX_MAXWAIT); |
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223 } |