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annotate src/timer/wince/SDL_systimer.c @ 1538:b1f8c14f0df5

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author Sam Lantinga <slouken@libsdl.org>
date Wed, 15 Mar 2006 03:50:34 +0000
parents 420b3f47806d
children 92947e3a18db
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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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 #define WIN32_LEAN_AND_MEAN
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25 #include <windows.h>
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26 #include <mmsystem.h>
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27
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28 #include "SDL_thread.h"
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29 #include "SDL_timer.h"
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30 #include "../SDL_timer_c.h"
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31
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32 static Uint64 start_date;
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33 static Uint64 start_ticks;
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34
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35 static Uint64 wce_ticks(void)
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36 {
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37 return((Uint64)GetTickCount());
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38 }
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39
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40 static Uint64 wce_date(void)
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41 {
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42 union
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43 {
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44 FILETIME ftime;
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45 Uint64 itime;
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46 } ftime;
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47 SYSTEMTIME stime;
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48
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49 GetSystemTime(&stime);
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50 SystemTimeToFileTime(&stime,&ftime.ftime);
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51 ftime.itime/=10000; // Convert 100ns intervals to 1ms intervals
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52 // Remove ms portion, which can't be relied on
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53 ftime.itime -= (ftime.itime % 1000);
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54 return(ftime.itime);
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55 }
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56
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57 static Sint32 wce_rel_ticks(void)
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58 {
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59 return((Sint32)(wce_ticks()-start_ticks));
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60 }
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61
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62 static Sint32 wce_rel_date(void)
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63 {
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64 return((Sint32)(wce_date()-start_date));
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65 }
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66
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67 /* Return time in ms relative to when SDL was started */
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68 Uint32 SDL_GetTicks()
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69 {
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70 Sint32 offset=wce_rel_date()-wce_rel_ticks();
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71 if((offset < -1000) || (offset > 1000))
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72 {
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73 // fprintf(stderr,"Time desync(%+d), resyncing\n",offset/1000);
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74 start_ticks-=offset;
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75 }
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76
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77 return((Uint32)wce_rel_ticks());
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78 }
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79
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80 /* Give up approx. givem milliseconds to the OS. */
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81 void SDL_Delay(Uint32 ms)
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82 {
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83 Sleep(ms);
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84 }
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85
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86 /* Recard start-time of application for reference */
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87 void SDL_StartTicks(void)
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88 {
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89 start_date=wce_date();
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90 start_ticks=wce_ticks();
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91 }
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92
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93 static UINT WIN_timer;
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94
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95 #if ( _WIN32_WCE <= 420 )
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96
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97 static HANDLE timersThread = 0;
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98 static HANDLE timersQuitEvent = 0;
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99
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100 DWORD TimersThreadProc(void *data)
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101 {
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102 while(WaitForSingleObject(timersQuitEvent, 10) == WAIT_TIMEOUT)
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103 {
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104 SDL_ThreadedTimerCheck();
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105 }
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106 return 0;
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107 }
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108
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109 int SDL_SYS_TimerInit(void)
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110 {
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111 // create a thread to process a threaded timers
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112 // SetTimer does not suit the needs because
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113 // TimerCallbackProc will be called only when WM_TIMER occured
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114
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115 timersQuitEvent = CreateEvent(0, TRUE, FALSE, 0);
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116 if( !timersQuitEvent )
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117 {
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118 SDL_SetError("Cannot create event for timers thread");
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119 return -1;
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120 }
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121 timersThread = CreateThread(NULL, 0, TimersThreadProc, 0, 0, 0);
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122 if( !timersThread )
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123 {
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124 SDL_SetError("Cannot create timers thread, check amount of RAM available");
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125 return -1;
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126 }
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127 SetThreadPriority(timersThread, THREAD_PRIORITY_HIGHEST);
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128
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129 return(SDL_SetTimerThreaded(1));
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130 }
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131
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132 void SDL_SYS_TimerQuit(void)
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133 {
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134 SetEvent(timersQuitEvent);
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135 if( WaitForSingleObject(timersThread, 2000) == WAIT_TIMEOUT )
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136 TerminateThread(timersThread, 0);
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137 CloseHandle(timersThread);
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138 CloseHandle(timersQuitEvent);
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139 return;
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140 }
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141
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142 #else
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143
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144 #pragma comment(lib, "mmtimer.lib")
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145
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146 /* Data to handle a single periodic alarm */
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147 static UINT timerID = 0;
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148
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149 static void CALLBACK HandleAlarm(UINT uID, UINT uMsg, DWORD dwUser,
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150 DWORD dw1, DWORD dw2)
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151 {
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152 SDL_ThreadedTimerCheck();
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153 }
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154
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155
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156 int SDL_SYS_TimerInit(void)
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157 {
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158 MMRESULT result;
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159
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160 /* Set timer resolution */
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161 result = timeBeginPeriod(TIMER_RESOLUTION);
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162 if ( result != TIMERR_NOERROR ) {
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163 SDL_SetError("Warning: Can't set %d ms timer resolution",
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164 TIMER_RESOLUTION);
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165 }
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166 /* Allow 10 ms of drift so we don't chew on CPU */
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167 timerID = timeSetEvent(TIMER_RESOLUTION,1,HandleAlarm,0,TIME_PERIODIC);
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168 if ( ! timerID ) {
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169 SDL_SetError("timeSetEvent() failed");
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170 return(-1);
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171 }
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172 return(SDL_SetTimerThreaded(1));
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173 }
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174
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175 void SDL_SYS_TimerQuit(void)
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176 {
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177 if ( timerID ) {
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178 timeKillEvent(timerID);
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179 }
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180 timeEndPeriod(TIMER_RESOLUTION);
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181 }
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182
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183 #endif
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184
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185 int SDL_SYS_StartTimer(void)
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186 {
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187 SDL_SetError("Internal logic error: WinCE uses threaded timer");
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188 return(-1);
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189 }
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190
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191 void SDL_SYS_StopTimer(void)
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192 {
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193 return;
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194 }