annotate src/thread/win32/SDL_syssem.c @ 4101:ab38230546a5 SDL-1.2

Oskar Linde fixed bug #507 Trackpad scrolling on OSX is broken. Scrolling up/slightly right gets translated into a Down event in SDL. The following patch fixes this extremely irritating issue:
author Sam Lantinga <slouken@libsdl.org>
date Fri, 28 Dec 2007 08:11:26 +0000
parents bb6839704ed6
children 782fd950bd46 c121d94672cb 84882a89ca50
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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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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 /* Semaphore functions using the Win32 API */
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25
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26 #define WIN32_LEAN_AND_MEAN
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27 #include <windows.h>
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28
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29 #include "SDL_thread.h"
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30 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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31 #include "win_ce_semaphore.h"
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32 #endif
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33
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34
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35 struct SDL_semaphore {
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36 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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37 SYNCHHANDLE id;
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38 #else
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39 HANDLE id;
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40 #endif
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41 Uint32 volatile count;
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42 };
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43
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44
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45 /* Create a semaphore */
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46 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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47 {
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48 SDL_sem *sem;
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49
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50 /* Allocate sem memory */
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51 sem = (SDL_sem *)SDL_malloc(sizeof(*sem));
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52 if ( sem ) {
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53 /* Create the semaphore, with max value 32K */
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54 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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55 sem->id = CreateSemaphoreCE(NULL, initial_value, 32*1024, NULL);
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56 #else
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57 sem->id = CreateSemaphore(NULL, initial_value, 32*1024, NULL);
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58 #endif
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59 sem->count = initial_value;
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60 if ( ! sem->id ) {
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61 SDL_SetError("Couldn't create semaphore");
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62 SDL_free(sem);
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63 sem = NULL;
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64 }
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65 } else {
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66 SDL_OutOfMemory();
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67 }
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68 return(sem);
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69 }
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70
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71 /* Free the semaphore */
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72 void SDL_DestroySemaphore(SDL_sem *sem)
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73 {
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74 if ( sem ) {
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75 if ( sem->id ) {
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76 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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77 CloseSynchHandle(sem->id);
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78 #else
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79 CloseHandle(sem->id);
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80 #endif
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81 sem->id = 0;
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82 }
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83 SDL_free(sem);
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84 }
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85 }
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86
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87 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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88 {
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89 int retval;
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90 DWORD dwMilliseconds;
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91
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92 if ( ! sem ) {
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93 SDL_SetError("Passed a NULL sem");
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94 return -1;
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95 }
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96
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97 if ( timeout == SDL_MUTEX_MAXWAIT ) {
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98 dwMilliseconds = INFINITE;
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99 } else {
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100 dwMilliseconds = (DWORD)timeout;
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101 }
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102 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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103 switch (WaitForSemaphoreCE(sem->id, dwMilliseconds)) {
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104 #else
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105 switch (WaitForSingleObject(sem->id, dwMilliseconds)) {
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106 #endif
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107 case WAIT_OBJECT_0:
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108 --sem->count;
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109 retval = 0;
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110 break;
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111 case WAIT_TIMEOUT:
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112 retval = SDL_MUTEX_TIMEDOUT;
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113 break;
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114 default:
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115 SDL_SetError("WaitForSingleObject() failed");
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116 retval = -1;
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117 break;
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118 }
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119 return retval;
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120 }
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121
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122 int SDL_SemTryWait(SDL_sem *sem)
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123 {
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124 return SDL_SemWaitTimeout(sem, 0);
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125 }
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126
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127 int SDL_SemWait(SDL_sem *sem)
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128 {
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129 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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130 }
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131
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132 /* Returns the current count of the semaphore */
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133 Uint32 SDL_SemValue(SDL_sem *sem)
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134 {
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135 if ( ! sem ) {
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136 SDL_SetError("Passed a NULL sem");
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137 return 0;
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138 }
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139 return sem->count;
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140 }
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141
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142 int SDL_SemPost(SDL_sem *sem)
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143 {
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144 if ( ! sem ) {
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145 SDL_SetError("Passed a NULL sem");
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146 return -1;
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147 }
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148 /* Increase the counter in the first place, because
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149 * after a successful release the semaphore may
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150 * immediately get destroyed by another thread which
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151 * is waiting for this semaphore.
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152 */
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153 ++sem->count;
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154 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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155 if ( ReleaseSemaphoreCE(sem->id, 1, NULL) == FALSE ) {
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156 #else
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157 if ( ReleaseSemaphore(sem->id, 1, NULL) == FALSE ) {
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158 #endif
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159 --sem->count; /* restore */
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160 SDL_SetError("ReleaseSemaphore() failed");
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161 return -1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
162 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
163 return 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
164 }