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annotate src/timer/wince/SDL_systimer.c @ 4866:f42e8db53f78

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Added a typedef for the thread function to simplify documentation
author Sam Lantinga <slouken@libsdl.org>
date Sat, 28 Aug 2010 22:56:52 -0700
parents f7b03b6838cb
children 327f181542f1
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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
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38 wce_ticks(void)
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39 {
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40 return ((Uint64) GetTickCount());
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41 }
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42
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43 static Uint64
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44 wce_date(void)
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45 {
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46 union
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47 {
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48 FILETIME ftime;
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49 Uint64 itime;
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50 } ftime;
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51 SYSTEMTIME stime;
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52
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53 GetSystemTime(&stime);
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54 SystemTimeToFileTime(&stime, &ftime.ftime);
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55 ftime.itime /= 10000; // Convert 100ns intervals to 1ms intervals
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56 // Remove ms portion, which can't be relied on
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57 ftime.itime -= (ftime.itime % 1000);
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58 return (ftime.itime);
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59 }
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60
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61 static Sint32
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62 wce_rel_ticks(void)
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63 {
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64 return ((Sint32) (wce_ticks() - start_ticks));
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65 }
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66
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67 static Sint32
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68 wce_rel_date(void)
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69 {
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70 return ((Sint32) (wce_date() - start_date));
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71 }
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72
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73 /* Return time in ms relative to when SDL was started */
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74 Uint32
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75 SDL_GetTicks()
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76 {
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77 Sint32 offset = wce_rel_date() - wce_rel_ticks();
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78 if ((offset < -1000) || (offset > 1000)) {
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79 // fprintf(stderr,"Time desync(%+d), resyncing\n",offset/1000);
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80 start_ticks -= offset;
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81 }
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82
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83 return ((Uint32) wce_rel_ticks());
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84 }
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85
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86 /* Give up approx. givem milliseconds to the OS. */
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87 void
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88 SDL_Delay(Uint32 ms)
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89 {
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90 Sleep(ms);
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91 }
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92
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93 /* Recard start-time of application for reference */
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94 void
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95 SDL_StartTicks(void)
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96 {
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97 start_date = wce_date();
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98 start_ticks = wce_ticks();
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99 }
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100
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101 static UINT WIN_timer;
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102
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103 #if ( _WIN32_WCE <= 420 )
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104
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105 static HANDLE timersThread = 0;
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106 static HANDLE timersQuitEvent = 0;
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107
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108 DWORD
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109 TimersThreadProc(void *data)
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110 {
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111 while (WaitForSingleObject(timersQuitEvent, 10) == WAIT_TIMEOUT) {
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112 SDL_ThreadedTimerCheck();
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113 }
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114 return 0;
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115 }
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116
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117 int
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118 SDL_SYS_TimerInit(void)
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119 {
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120 // create a thread to process a threaded timers
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121 // SetTimer does not suit the needs because
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122 // TimerCallbackProc will be called only when WM_TIMER occured
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123
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124 timersQuitEvent = CreateEvent(0, TRUE, FALSE, 0);
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125 if (!timersQuitEvent) {
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126 SDL_SetError("Cannot create event for timers thread");
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127 return -1;
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128 }
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129 timersThread = CreateThread(NULL, 0, TimersThreadProc, 0, 0, 0);
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130 if (!timersThread) {
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131 SDL_SetError
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132 ("Cannot create timers thread, check amount of RAM available");
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133 return -1;
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134 }
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135 SetThreadPriority(timersThread, THREAD_PRIORITY_HIGHEST);
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136
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137 return (SDL_SetTimerThreaded(1));
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138 }
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139
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140 void
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141 SDL_SYS_TimerQuit(void)
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142 {
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143 SetEvent(timersQuitEvent);
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144 if (WaitForSingleObject(timersThread, 2000) == WAIT_TIMEOUT)
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145 TerminateThread(timersThread, 0);
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146 CloseHandle(timersThread);
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147 CloseHandle(timersQuitEvent);
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148 return;
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149 }
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150
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151 #else
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152
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153 #pragma comment(lib, "mmtimer.lib")
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154
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155 /* Data to handle a single periodic alarm */
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156 static UINT timerID = 0;
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157
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158 static void CALLBACK
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159 HandleAlarm(UINT uID, UINT uMsg, DWORD dwUser, DWORD dw1, DWORD dw2)
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160 {
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161 SDL_ThreadedTimerCheck();
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162 }
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163
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164
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165 int
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166 SDL_SYS_TimerInit(void)
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167 {
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168 MMRESULT result;
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169
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170 /* Set timer resolution */
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171 result = timeBeginPeriod(TIMER_RESOLUTION);
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172 if (result != TIMERR_NOERROR) {
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173 SDL_SetError("Warning: Can't set %d ms timer resolution",
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174 TIMER_RESOLUTION);
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175 }
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176 /* Allow 10 ms of drift so we don't chew on CPU */
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177 timerID =
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178 timeSetEvent(TIMER_RESOLUTION, 1, HandleAlarm, 0, TIME_PERIODIC);
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179 if (!timerID) {
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180 SDL_SetError("timeSetEvent() failed");
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181 return (-1);
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182 }
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183 return (SDL_SetTimerThreaded(1));
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184 }
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185
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186 void
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187 SDL_SYS_TimerQuit(void)
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188 {
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189 if (timerID) {
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190 timeKillEvent(timerID);
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191 }
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192 timeEndPeriod(TIMER_RESOLUTION);
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193 }
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194
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195 #endif
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196
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197 int
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198 SDL_SYS_StartTimer(void)
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199 {
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200 SDL_SetError("Internal logic error: WinCE uses threaded timer");
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201 return (-1);
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202 }
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203
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204 void
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205 SDL_SYS_StopTimer(void)
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206 {
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207 return;
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208 }
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209
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210 #endif /* SDL_TIMER_WINCE */
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211 /* vi: set ts=4 sw=4 expandtab: */