Mercurial > sdl-ios-xcode
annotate src/timer/wince/SDL_systimer.c @ 4386:dcb26ac38e6b SDL-1.2
Fixed crash - need to save and restore rbx around cpuid, since the compiler may be assuming the stack pointer isn't being modified when filling in %0.
I did it around each call to cpuid which isn't strictly necessary, but is definitely future proof. :)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 02 Dec 2009 16:24:21 +0000 |
| parents | a1b03ba2fcd0 |
| children |
| rev | line source |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
| 4159 | 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 */ |