Mercurial > sdl-ios-xcode
annotate docs/html/sdlsemwaittimeout.html @ 2884:9dde605c7540
Date: Fri, 19 Dec 2008 20:17:35 +0100
From: Couriersud
Subject: Re: Aw: Experience using SDL1.3 in sdlmame/Proposal for api additions
> For consistency you'd probably want:
> SDL_SetRenderDrawColor(Uint8 r, Uint8 g, Uint8 b, Uint8 a);
> SDL_SetRenderDrawBlendMode(SDL_BlendMode blendMode);
> SDL_RenderLine(int x1, int y1, int x2, int y2);
> SDL_RenderFill(SDL_Rect *rect);
>
> You probably also want to add API functions query the current state.
>
I have implemented the above api for the opengl, x11, directfb and
software renderers. I have also renamed *TEXTUREBLENDMODE* constants to
BLENDMODE*. The unix build compiles. The windows renderer still needs to
be updated, but I have no windows development machine at hand. Have a
look at the x11 renderer for a sample.
Vector games now run at 90% both on opengl and directfb in comparison to
sdlmame's own opengl renderer. The same applies to raster games.
The diff also includes
a) Changed XDrawRect to XFillRect in x11 renderer
b) A number of changes to fix blending and modulation issues in the
directfb renderer.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 20 Dec 2008 12:00:00 +0000 |
parents | 355632dca928 |
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rev | line source |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_SemWaitTimeout</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="Multi-threaded Programming" | |
14 HREF="thread.html"><LINK | |
15 REL="PREVIOUS" | |
16 TITLE="SDL_SemTryWait" | |
17 HREF="sdlsemtrywait.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_SemPost" | |
20 HREF="sdlsempost.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="sdlsemtrywait.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="sdlsempost.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="SDLSEMWAITTIMEOUT" | |
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74 ></A |
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75 >SDL_SemWaitTimeout</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
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79 NAME="AEN8120" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_SemWaitTimeout -- Lock a semaphore, but only wait up to a specified maximum time.</DIV | |
84 ><DIV | |
85 CLASS="REFSYNOPSISDIV" | |
86 ><A | |
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87 NAME="AEN8123" |
0 | 88 ></A |
89 ><H2 | |
90 >Synopsis</H2 | |
91 ><DIV | |
92 CLASS="FUNCSYNOPSIS" | |
93 ><A | |
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94 NAME="AEN8124" |
0 | 95 ></A |
96 ><P | |
97 ></P | |
98 ><PRE | |
99 CLASS="FUNCSYNOPSISINFO" | |
100 >#include "SDL.h" | |
101 #include "SDL_thread.h"</PRE | |
102 ><P | |
103 ><CODE | |
104 ><CODE | |
105 CLASS="FUNCDEF" | |
106 >int <B | |
107 CLASS="FSFUNC" | |
108 >SDL_SemWaitTimeout</B | |
109 ></CODE | |
110 >(SDL_sem *sem, Uint32 timeout);</CODE | |
111 ></P | |
112 ><P | |
113 ></P | |
114 ></DIV | |
115 ></DIV | |
116 ><DIV | |
117 CLASS="REFSECT1" | |
118 ><A | |
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119 NAME="AEN8130" |
0 | 120 ></A |
121 ><H2 | |
122 >Description</H2 | |
123 ><P | |
124 ><TT | |
125 CLASS="FUNCTION" | |
126 >SDL_SemWaitTimeout()</TT | |
127 > is a varient of | |
128 <A | |
129 HREF="sdlsemwait.html" | |
130 >SDL_SemWait</A | |
131 > | |
132 with a maximum timeout value. | |
133 If the value of the semaphore pointed to by <TT | |
134 CLASS="PARAMETER" | |
135 ><I | |
136 >sem</I | |
137 ></TT | |
138 > is | |
139 positive (greater than zero) it will atomically decrement the semaphore value | |
140 and return 0, otherwise it will wait up to <TT | |
141 CLASS="PARAMETER" | |
142 ><I | |
143 >timeout</I | |
144 ></TT | |
145 > | |
146 milliseconds trying to lock the semaphore. This function is to be avoided if | |
147 possible since on some platforms it is implemented by polling the semaphore | |
148 every millisecond in a busy loop.</P | |
149 ><P | |
150 >After <TT | |
151 CLASS="FUNCTION" | |
152 >SDL_SemWaitTimeout()</TT | |
153 > is successful, the semaphore | |
154 can be released and its count atomically incremented by a successful call to | |
155 <A | |
156 HREF="sdlsempost.html" | |
157 >SDL_SemPost</A | |
158 >.</P | |
159 ></DIV | |
160 ><DIV | |
161 CLASS="REFSECT1" | |
162 ><A | |
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163 NAME="AEN8140" |
0 | 164 ></A |
165 ><H2 | |
166 >Return Value</H2 | |
167 ><P | |
168 >Returns <SPAN | |
169 CLASS="RETURNVALUE" | |
170 >0</SPAN | |
171 > if the semaphore was successfully locked or | |
172 either <SPAN | |
173 CLASS="RETURNVALUE" | |
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174 >SDL_MUTEX_TIMEDOUT</SPAN |
0 | 175 > or <SPAN |
176 CLASS="RETURNVALUE" | |
177 >-1</SPAN | |
178 > | |
179 if the timeout period was exceeded or there was an error, respectivly.</P | |
180 ><P | |
181 >If the semaphore was not successfully locked, the semaphore will be unchanged.</P | |
182 ></DIV | |
183 ><DIV | |
184 CLASS="REFSECT1" | |
185 ><A | |
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186 NAME="AEN8147" |
0 | 187 ></A |
188 ><H2 | |
189 >Examples</H2 | |
190 ><P | |
191 ><PRE | |
192 CLASS="PROGRAMLISTING" | |
193 >res = SDL_SemWaitTimeout(my_sem, WAIT_TIMEOUT_MILLISEC); | |
194 | |
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195 if (res == SDL_MUTEX_TIMEDOUT) { |
0 | 196 return TRY_AGAIN; |
197 } | |
198 if (res == -1) { | |
199 return WAIT_ERROR; | |
200 } | |
201 | |
202 ... | |
203 | |
204 SDL_SemPost(my_sem);</PRE | |
205 ></P | |
206 ></DIV | |
207 ><DIV | |
208 CLASS="REFSECT1" | |
209 ><A | |
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210 NAME="AEN8151" |
0 | 211 ></A |
212 ><H2 | |
213 >See Also</H2 | |
214 ><P | |
215 ><A | |
216 HREF="sdlcreatesemaphore.html" | |
217 ><TT | |
218 CLASS="FUNCTION" | |
219 >SDL_CreateSemaphore</TT | |
220 ></A | |
221 >, | |
222 <A | |
223 HREF="sdldestroysemaphore.html" | |
224 ><TT | |
225 CLASS="FUNCTION" | |
226 >SDL_DestroySemaphore</TT | |
227 ></A | |
228 >, | |
229 <A | |
230 HREF="sdlsemwait.html" | |
231 ><TT | |
232 CLASS="FUNCTION" | |
233 >SDL_SemWait</TT | |
234 ></A | |
235 >, | |
236 <A | |
237 HREF="sdlsemtrywait.html" | |
238 ><TT | |
239 CLASS="FUNCTION" | |
240 >SDL_SemTryWait</TT | |
241 ></A | |
242 >, | |
243 <A | |
244 HREF="sdlsempost.html" | |
245 ><TT | |
246 CLASS="FUNCTION" | |
247 >SDL_SemPost</TT | |
248 ></A | |
249 >, | |
250 <A | |
251 HREF="sdlsemvalue.html" | |
252 ><TT | |
253 CLASS="FUNCTION" | |
254 >SDL_SemValue</TT | |
255 ></A | |
256 ></P | |
257 ></DIV | |
258 ><DIV | |
259 CLASS="NAVFOOTER" | |
260 ><HR | |
261 ALIGN="LEFT" | |
262 WIDTH="100%"><TABLE | |
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263 SUMMARY="Footer navigation table" |
0 | 264 WIDTH="100%" |
265 BORDER="0" | |
266 CELLPADDING="0" | |
267 CELLSPACING="0" | |
268 ><TR | |
269 ><TD | |
270 WIDTH="33%" | |
271 ALIGN="left" | |
272 VALIGN="top" | |
273 ><A | |
274 HREF="sdlsemtrywait.html" | |
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275 ACCESSKEY="P" |
0 | 276 >Prev</A |
277 ></TD | |
278 ><TD | |
279 WIDTH="34%" | |
280 ALIGN="center" | |
281 VALIGN="top" | |
282 ><A | |
283 HREF="index.html" | |
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284 ACCESSKEY="H" |
0 | 285 >Home</A |
286 ></TD | |
287 ><TD | |
288 WIDTH="33%" | |
289 ALIGN="right" | |
290 VALIGN="top" | |
291 ><A | |
292 HREF="sdlsempost.html" | |
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293 ACCESSKEY="N" |
0 | 294 >Next</A |
295 ></TD | |
296 ></TR | |
297 ><TR | |
298 ><TD | |
299 WIDTH="33%" | |
300 ALIGN="left" | |
301 VALIGN="top" | |
302 >SDL_SemTryWait</TD | |
303 ><TD | |
304 WIDTH="34%" | |
305 ALIGN="center" | |
306 VALIGN="top" | |
307 ><A | |
308 HREF="thread.html" | |
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309 ACCESSKEY="U" |
0 | 310 >Up</A |
311 ></TD | |
312 ><TD | |
313 WIDTH="33%" | |
314 ALIGN="right" | |
315 VALIGN="top" | |
316 >SDL_SemPost</TD | |
317 ></TR | |
318 ></TABLE | |
319 ></DIV | |
320 ></BODY | |
321 ></HTML | |
322 > |