Mercurial > sdl-ios-xcode
annotate docs/html/sdladdtimer.html @ 2171:4bd2dc41fc15
Fixed compiling the x11 driver
author | Sam Lantinga <slouken@libsdl.org> |
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date | Wed, 11 Jul 2007 14:49:44 +0000 |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_AddTimer</TITLE | |
5 ><META | |
6 NAME="GENERATOR" | |
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ |
0 | 8 "><LINK |
9 REL="HOME" | |
10 TITLE="SDL Library Documentation" | |
11 HREF="index.html"><LINK | |
12 REL="UP" | |
13 TITLE="Time" | |
14 HREF="time.html"><LINK | |
15 REL="PREVIOUS" | |
16 TITLE="SDL_Delay" | |
17 HREF="sdldelay.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_RemoveTimer" | |
20 HREF="sdlremovetimer.html"></HEAD | |
21 ><BODY | |
22 CLASS="REFENTRY" | |
23 BGCOLOR="#FFF8DC" | |
24 TEXT="#000000" | |
25 LINK="#0000ee" | |
26 VLINK="#551a8b" | |
27 ALINK="#ff0000" | |
28 ><DIV | |
29 CLASS="NAVHEADER" | |
30 ><TABLE | |
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31 SUMMARY="Header navigation table" |
0 | 32 WIDTH="100%" |
33 BORDER="0" | |
34 CELLPADDING="0" | |
35 CELLSPACING="0" | |
36 ><TR | |
37 ><TH | |
38 COLSPAN="3" | |
39 ALIGN="center" | |
40 >SDL Library Documentation</TH | |
41 ></TR | |
42 ><TR | |
43 ><TD | |
44 WIDTH="10%" | |
45 ALIGN="left" | |
46 VALIGN="bottom" | |
47 ><A | |
48 HREF="sdldelay.html" | |
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49 ACCESSKEY="P" |
0 | 50 >Prev</A |
51 ></TD | |
52 ><TD | |
53 WIDTH="80%" | |
54 ALIGN="center" | |
55 VALIGN="bottom" | |
56 ></TD | |
57 ><TD | |
58 WIDTH="10%" | |
59 ALIGN="right" | |
60 VALIGN="bottom" | |
61 ><A | |
62 HREF="sdlremovetimer.html" | |
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63 ACCESSKEY="N" |
0 | 64 >Next</A |
65 ></TD | |
66 ></TR | |
67 ></TABLE | |
68 ><HR | |
69 ALIGN="LEFT" | |
70 WIDTH="100%"></DIV | |
71 ><H1 | |
72 ><A | |
73 NAME="SDLADDTIMER" | |
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74 ></A |
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75 >SDL_AddTimer</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
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79 NAME="AEN8482" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_AddTimer -- Add a timer which will call a callback after the specified number of milliseconds has | |
84 elapsed.</DIV | |
85 ><DIV | |
86 CLASS="REFSYNOPSISDIV" | |
87 ><A | |
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88 NAME="AEN8485" |
0 | 89 ></A |
90 ><H2 | |
91 >Synopsis</H2 | |
92 ><DIV | |
93 CLASS="FUNCSYNOPSIS" | |
94 ><A | |
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95 NAME="AEN8486" |
0 | 96 ></A |
97 ><P | |
98 ></P | |
99 ><PRE | |
100 CLASS="FUNCSYNOPSISINFO" | |
101 >#include "SDL.h"</PRE | |
102 ><P | |
103 ><CODE | |
104 ><CODE | |
105 CLASS="FUNCDEF" | |
106 >SDL_TimerID <B | |
107 CLASS="FSFUNC" | |
108 >SDL_AddTimer</B | |
109 ></CODE | |
110 >(Uint32 interval, SDL_NewTimerCallback callback, void *param);</CODE | |
111 ></P | |
112 ><P | |
113 ></P | |
114 ></DIV | |
115 ></DIV | |
116 ><DIV | |
117 CLASS="REFSECT1" | |
118 ><A | |
119 NAME="SDLNEWTIMERCALLBACK" | |
120 ></A | |
121 ><H2 | |
122 >Callback</H2 | |
123 ><PRE | |
124 CLASS="PROGRAMLISTING" | |
125 >/* type definition for the "new" timer callback function */ | |
126 typedef Uint32 (*SDL_NewTimerCallback)(Uint32 interval, void *param);</PRE | |
127 ></DIV | |
128 ><DIV | |
129 CLASS="REFSECT1" | |
130 ><A | |
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131 NAME="AEN8495" |
0 | 132 ></A |
133 ><H2 | |
134 >Description</H2 | |
135 ><P | |
136 >Adds a callback function to be run after the specified number of | |
137 milliseconds has elapsed. The callback function is passed the current | |
138 timer interval and the user supplied parameter from the | |
139 <TT | |
140 CLASS="FUNCTION" | |
141 >SDL_AddTimer</TT | |
142 > call and returns the next timer | |
143 interval. If the returned value from the callback is the same as the one | |
144 passed in, the periodic alarm continues, otherwise a new alarm is | |
145 scheduled.</P | |
146 ><P | |
147 >To cancel a currently running timer call | |
148 <A | |
149 HREF="sdlremovetimer.html" | |
150 >SDL_RemoveTimer</A | |
151 > with the | |
152 timer ID returned from | |
153 <TT | |
154 CLASS="FUNCTION" | |
155 >SDL_AddTimer</TT | |
156 >.</P | |
157 ><P | |
158 >The timer callback function may run in a different thread than your | |
55
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159 main program, and so shouldn't call any functions from within itself. |
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160 You may always call <A |
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161 HREF="sdlpushevent.html" |
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162 >SDL_PushEvent</A |
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163 >, however.</P |
0 | 164 ><P |
55
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165 >The granularity of the timer is platform-dependent, but you should count |
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166 on it being at least 10 ms as this is the most common number. |
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167 This means that if |
0 | 168 you request a 16 ms timer, your callback will run approximately 20 ms |
169 later on an unloaded system. If you wanted to set a flag signaling | |
170 a frame update at 30 frames per second (every 33 ms), you might set a | |
171 timer for 30 ms (see example below). | |
172 | |
173 If you use this function, you need to pass <TT | |
174 CLASS="LITERAL" | |
175 >SDL_INIT_TIMER</TT | |
176 > | |
177 to <A | |
178 HREF="sdlinit.html" | |
179 >SDL_Init</A | |
180 >.</P | |
181 ></DIV | |
182 ><DIV | |
183 CLASS="REFSECT1" | |
184 ><A | |
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185 NAME="AEN8507" |
0 | 186 ></A |
187 ><H2 | |
188 >Return Value</H2 | |
189 ><P | |
190 >Returns an ID value for the added timer or | |
191 <SPAN | |
192 CLASS="RETURNVALUE" | |
193 >NULL</SPAN | |
194 > if there was an error.</P | |
195 ></DIV | |
196 ><DIV | |
197 CLASS="REFSECT1" | |
198 ><A | |
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199 NAME="AEN8511" |
0 | 200 ></A |
201 ><H2 | |
202 >Examples</H2 | |
203 ><P | |
204 ><PRE | |
205 CLASS="PROGRAMLISTING" | |
206 >my_timer_id = SDL_AddTimer((33/10)*10, my_callbackfunc, my_callback_param);</PRE | |
207 ></P | |
208 ></DIV | |
209 ><DIV | |
210 CLASS="REFSECT1" | |
211 ><A | |
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212 NAME="AEN8515" |
0 | 213 ></A |
214 ><H2 | |
215 >See Also</H2 | |
216 ><P | |
217 ><A | |
218 HREF="sdlremovetimer.html" | |
219 ><TT | |
220 CLASS="FUNCTION" | |
221 >SDL_RemoveTimer</TT | |
222 ></A | |
55
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223 >, |
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224 <A |
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225 HREF="sdlpushevent.html" |
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226 ><TT |
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227 CLASS="FUNCTION" |
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228 >SDL_PushEvent</TT |
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229 ></A |
0 | 230 ></P |
231 ></DIV | |
232 ><DIV | |
233 CLASS="NAVFOOTER" | |
234 ><HR | |
235 ALIGN="LEFT" | |
236 WIDTH="100%"><TABLE | |
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237 SUMMARY="Footer navigation table" |
0 | 238 WIDTH="100%" |
239 BORDER="0" | |
240 CELLPADDING="0" | |
241 CELLSPACING="0" | |
242 ><TR | |
243 ><TD | |
244 WIDTH="33%" | |
245 ALIGN="left" | |
246 VALIGN="top" | |
247 ><A | |
248 HREF="sdldelay.html" | |
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249 ACCESSKEY="P" |
0 | 250 >Prev</A |
251 ></TD | |
252 ><TD | |
253 WIDTH="34%" | |
254 ALIGN="center" | |
255 VALIGN="top" | |
256 ><A | |
257 HREF="index.html" | |
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258 ACCESSKEY="H" |
0 | 259 >Home</A |
260 ></TD | |
261 ><TD | |
262 WIDTH="33%" | |
263 ALIGN="right" | |
264 VALIGN="top" | |
265 ><A | |
266 HREF="sdlremovetimer.html" | |
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267 ACCESSKEY="N" |
0 | 268 >Next</A |
269 ></TD | |
270 ></TR | |
271 ><TR | |
272 ><TD | |
273 WIDTH="33%" | |
274 ALIGN="left" | |
275 VALIGN="top" | |
276 >SDL_Delay</TD | |
277 ><TD | |
278 WIDTH="34%" | |
279 ALIGN="center" | |
280 VALIGN="top" | |
281 ><A | |
282 HREF="time.html" | |
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283 ACCESSKEY="U" |
0 | 284 >Up</A |
285 ></TD | |
286 ><TD | |
287 WIDTH="33%" | |
288 ALIGN="right" | |
289 VALIGN="top" | |
290 >SDL_RemoveTimer</TD | |
291 ></TR | |
292 ></TABLE | |
293 ></DIV | |
294 ></BODY | |
295 ></HTML | |
296 > |