Mercurial > sdl-ios-xcode

comparison src/timer/windows/SDL_systimer.c @ 5113:481dabb098ef

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Improved timer implementation The new timer model is formalized as using a separate thread to handle timer callbacks. This was the case on almost every platform before, but it's now a requirement, and simplifies the implementation and makes it perform consistently across platforms. Goals: * Minimize timer thread blocking * Dispatch timers as accurately as possible * SDL_AddTimer() and SDL_RemoveTimer() are completely threadsafe * SDL_RemoveTimer() doesn't crash with a timer that's expired or removed
author Sam Lantinga <slouken@libsdl.org>
date Thu, 27 Jan 2011 14:45:06 -0800
parents 327f181542f1
children e337f792c6a7
comparison
equal deleted inserted replaced
5112:0846f18eb625 5113:481dabb098ef
22 #include "SDL_config.h" 22 #include "SDL_config.h"
23 23
24 #ifdef SDL_TIMER_WINDOWS 24 #ifdef SDL_TIMER_WINDOWS
25 25
26 #include "../../core/windows/SDL_windows.h" 26 #include "../../core/windows/SDL_windows.h"
27 #include <mmsystem.h>
28 27
29 #include "SDL_timer.h" 28 #include "SDL_timer.h"
30 #include "../SDL_timer_c.h"
31 29
32 #ifdef _WIN32_WCE 30 #ifdef _WIN32_WCE
33 #error This is WinCE. Please use src/timer/wince/SDL_systimer.c instead. 31 #error This is WinCE. Please use src/timer/wince/SDL_systimer.c instead.
34 #endif 32 #endif
35 33
104 SDL_Delay(Uint32 ms) 102 SDL_Delay(Uint32 ms)
105 { 103 {
106 Sleep(ms); 104 Sleep(ms);
107 } 105 }
108 106
109 /* Data to handle a single periodic alarm */
110 static UINT timerID = 0;
111
112 static void CALLBACK
113 HandleAlarm(UINT uID, UINT uMsg, DWORD_PTR dwUser,
114 DWORD_PTR dw1, DWORD_PTR dw2)
115 {
116 SDL_ThreadedTimerCheck();
117 }
118
119
120 int
121 SDL_SYS_TimerInit(void)
122 {
123 MMRESULT result;
124
125 /* Set timer resolution */
126 result = timeBeginPeriod(TIMER_RESOLUTION);
127 if (result != TIMERR_NOERROR) {
128 SDL_SetError("Warning: Can't set %d ms timer resolution",
129 TIMER_RESOLUTION);
130 }
131 /* Allow 10 ms of drift so we don't chew on CPU */
132 timerID =
133 timeSetEvent(TIMER_RESOLUTION, 1, HandleAlarm, 0, TIME_PERIODIC);
134 if (!timerID) {
135 SDL_SetError("timeSetEvent() failed");
136 return (-1);
137 }
138 return (SDL_SetTimerThreaded(1));
139 }
140
141 void
142 SDL_SYS_TimerQuit(void)
143 {
144 if (timerID) {
145 timeKillEvent(timerID);
146 }
147 timeEndPeriod(TIMER_RESOLUTION);
148 }
149
150 int
151 SDL_SYS_StartTimer(void)
152 {
153 SDL_SetError("Internal logic error: Win32 uses threaded timer");
154 return (-1);
155 }
156
157 void
158 SDL_SYS_StopTimer(void)
159 {
160 return;
161 }
162
163 #endif /* SDL_TIMER_WINDOWS */ 107 #endif /* SDL_TIMER_WINDOWS */
164 108
165 /* vi: set ts=4 sw=4 expandtab: */ 109 /* vi: set ts=4 sw=4 expandtab: */