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annotate src/timer/wince/SDL_systimer.c @ 4543:d7cdc25af9a2 SDL-1.2

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Better fix for bug 936
author Sam Lantinga <slouken@libsdl.org>
date Sun, 18 Jul 2010 10:28:57 -0700
parents a1b03ba2fcd0
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 #ifdef SDL_TIMER_WINCE
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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 #include <mmsystem.h>
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29
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30 #include "SDL_thread.h"
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31 #include "SDL_timer.h"
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32 #include "../SDL_timer_c.h"
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33
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34 static Uint64 start_date;
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35 static Uint64 start_ticks;
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36
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37 static Uint64 wce_ticks(void)
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38 {
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39 return((Uint64)GetTickCount());
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40 }
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41
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42 static Uint64 wce_date(void)
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43 {
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44 union
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45 {
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46 FILETIME ftime;
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47 Uint64 itime;
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48 } ftime;
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49 SYSTEMTIME stime;
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50
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51 GetSystemTime(&stime);
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52 SystemTimeToFileTime(&stime,&ftime.ftime);
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53 ftime.itime/=10000; // Convert 100ns intervals to 1ms intervals
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54 // Remove ms portion, which can't be relied on
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55 ftime.itime -= (ftime.itime % 1000);
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56 return(ftime.itime);
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57 }
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58
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59 static Sint32 wce_rel_ticks(void)
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60 {
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61 return((Sint32)(wce_ticks()-start_ticks));
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62 }
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63
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64 static Sint32 wce_rel_date(void)
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65 {
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66 return((Sint32)(wce_date()-start_date));
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67 }
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68
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69 /* Return time in ms relative to when SDL was started */
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70 Uint32 SDL_GetTicks()
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71 {
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72 Sint32 offset=wce_rel_date()-wce_rel_ticks();
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73 if((offset < -1000) || (offset > 1000))
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74 {
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75 // fprintf(stderr,"Time desync(%+d), resyncing\n",offset/1000);
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76 start_ticks-=offset;
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77 }
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78
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79 return((Uint32)wce_rel_ticks());
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80 }
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81
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82 /* Give up approx. givem milliseconds to the OS. */
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83 void SDL_Delay(Uint32 ms)
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84 {
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85 Sleep(ms);
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86 }
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87
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88 /* Recard start-time of application for reference */
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89 void SDL_StartTicks(void)
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90 {
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91 start_date=wce_date();
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92 start_ticks=wce_ticks();
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93 }
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94
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95 static UINT WIN_timer;
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96
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97 #if ( _WIN32_WCE <= 420 )
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98
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99 static HANDLE timersThread = 0;
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100 static HANDLE timersQuitEvent = 0;
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101
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102 DWORD TimersThreadProc(void *data)
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103 {
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104 while(WaitForSingleObject(timersQuitEvent, 10) == WAIT_TIMEOUT)
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105 {
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106 SDL_ThreadedTimerCheck();
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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 int SDL_SYS_TimerInit(void)
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112 {
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113 // create a thread to process a threaded timers
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114 // SetTimer does not suit the needs because
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115 // TimerCallbackProc will be called only when WM_TIMER occured
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116
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117 timersQuitEvent = CreateEvent(0, TRUE, FALSE, 0);
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118 if( !timersQuitEvent )
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119 {
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120 SDL_SetError("Cannot create event for timers thread");
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121 return -1;
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122 }
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123 timersThread = CreateThread(NULL, 0, TimersThreadProc, 0, 0, 0);
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124 if( !timersThread )
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125 {
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126 SDL_SetError("Cannot create timers thread, check amount of RAM available");
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127 return -1;
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128 }
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129 SetThreadPriority(timersThread, THREAD_PRIORITY_HIGHEST);
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130
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131 return(SDL_SetTimerThreaded(1));
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132 }
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133
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134 void SDL_SYS_TimerQuit(void)
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135 {
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136 SetEvent(timersQuitEvent);
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137 if( WaitForSingleObject(timersThread, 2000) == WAIT_TIMEOUT )
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138 TerminateThread(timersThread, 0);
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139 CloseHandle(timersThread);
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140 CloseHandle(timersQuitEvent);
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141 return;
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142 }
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143
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144 #else
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145
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146 #pragma comment(lib, "mmtimer.lib")
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147
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148 /* Data to handle a single periodic alarm */
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149 static UINT timerID = 0;
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150
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151 static void CALLBACK HandleAlarm(UINT uID, UINT uMsg, DWORD dwUser,
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152 DWORD dw1, DWORD dw2)
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153 {
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154 SDL_ThreadedTimerCheck();
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155 }
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156
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157
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158 int SDL_SYS_TimerInit(void)
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159 {
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160 MMRESULT result;
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161
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162 /* Set timer resolution */
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163 result = timeBeginPeriod(TIMER_RESOLUTION);
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164 if ( result != TIMERR_NOERROR ) {
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165 SDL_SetError("Warning: Can't set %d ms timer resolution",
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166 TIMER_RESOLUTION);
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167 }
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168 /* Allow 10 ms of drift so we don't chew on CPU */
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169 timerID = timeSetEvent(TIMER_RESOLUTION,1,HandleAlarm,0,TIME_PERIODIC);
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170 if ( ! timerID ) {
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171 SDL_SetError("timeSetEvent() failed");
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172 return(-1);
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173 }
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174 return(SDL_SetTimerThreaded(1));
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175 }
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176
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177 void SDL_SYS_TimerQuit(void)
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178 {
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179 if ( timerID ) {
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180 timeKillEvent(timerID);
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181 }
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182 timeEndPeriod(TIMER_RESOLUTION);
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183 }
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184
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185 #endif
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186
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187 int SDL_SYS_StartTimer(void)
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188 {
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189 SDL_SetError("Internal logic error: WinCE uses threaded timer");
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190 return(-1);
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191 }
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192
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193 void SDL_SYS_StopTimer(void)
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194 {
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195 return;
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196 }
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197
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198 #endif /* SDL_TIMER_WINCE */