Mercurial > sdl-ios-xcode
annotate docs/html/sdlcreatesemaphore.html @ 914:bbf8dcc8aed6
Date: Wed, 23 Jun 2004 17:05:33 -0400
From: Chris Nelson
Subject: [SDL] [Patch] WiseGroup MP-8800 / MP-8866 (PS2 Joystick)
In the current cvs version, SDL doesn't handle these Playstation2
controller => USB adapters correctly, in linux.
It will always assume that the maximum number of joysticks (2 in the
case of the MP-8866, 4 in the case of the 8800) are plugged in. This is
bad not only because it allows SDL to exaggerate the number of logical
joysticks, but primarily because the joystick axes are mapped
incorrectly, all over the place, such that the devices are effectively
unusable unless you have the maximum number of joysticks plugged in.
My changes to src/joystick/linux/SDL_sysjoystick.c build on another's
previous work (which was a special case for this very joystick,
actually), and fix both of these problems, as well as making the current
code a little more general, to allow for others to more easily drop in
code for quirky joysticks such as these.
I've tested this code under 2.6.7 as well as 2.4.24... Both work as
advertised (provided you load the JOYDEV linux code as a module,
otherwise they won't work at all, new code or old, but that's another
issue entirely).
Though this sounds horribly formal, you have my permission to distribute
all of my work on this issue under the LGPL. So there.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 25 Jul 2004 18:31:50 +0000 |
parents | 355632dca928 |
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rev | line source |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_CreateSemaphore</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_mutexV" | |
17 HREF="sdlmutexv.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_DestroySemaphore" | |
20 HREF="sdldestroysemaphore.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="sdlmutexv.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="sdldestroysemaphore.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="SDLCREATESEMAPHORE" | |
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74 ></A |
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75 >SDL_CreateSemaphore</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
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79 NAME="AEN7936" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_CreateSemaphore -- Creates a new semaphore and assigns an initial value to it.</DIV | |
84 ><DIV | |
85 CLASS="REFSYNOPSISDIV" | |
86 ><A | |
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87 NAME="AEN7939" |
0 | 88 ></A |
89 ><H2 | |
90 >Synopsis</H2 | |
91 ><DIV | |
92 CLASS="FUNCSYNOPSIS" | |
93 ><A | |
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94 NAME="AEN7940" |
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 >SDL_sem *<B | |
107 CLASS="FSFUNC" | |
108 >SDL_CreateSemaphore</B | |
109 ></CODE | |
110 >(Uint32 initial_value);</CODE | |
111 ></P | |
112 ><P | |
113 ></P | |
114 ></DIV | |
115 ></DIV | |
116 ><DIV | |
117 CLASS="REFSECT1" | |
118 ><A | |
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119 NAME="AEN7946" |
0 | 120 ></A |
121 ><H2 | |
122 >Description</H2 | |
123 ><P | |
124 ><TT | |
125 CLASS="FUNCTION" | |
126 >SDL_CreateSemaphore()</TT | |
127 > creates a new semaphore and | |
128 initializes it with the value <TT | |
129 CLASS="PARAMETER" | |
130 ><I | |
131 >initial_value</I | |
132 ></TT | |
133 >. | |
134 Each locking operation on the semaphore by | |
135 <A | |
136 HREF="sdlsemwait.html" | |
137 >SDL_SemWait</A | |
138 >, | |
139 <A | |
140 HREF="sdlsemtrywait.html" | |
141 >SDL_SemTryWait</A | |
142 > or | |
143 <A | |
144 HREF="sdlsemwaittimeout.html" | |
145 >SDL_SemWaitTimeout</A | |
146 > | |
147 will atomically decrement the semaphore value. The locking operation will be blocked | |
148 if the semaphore value is not positive (greater than zero). Each unlock operation by | |
149 <A | |
150 HREF="sdlsempost.html" | |
151 >SDL_SemPost</A | |
152 > | |
153 will atomically increment the semaphore value.</P | |
154 ></DIV | |
155 ><DIV | |
156 CLASS="REFSECT1" | |
157 ><A | |
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158 NAME="AEN7955" |
0 | 159 ></A |
160 ><H2 | |
161 >Return Value</H2 | |
162 ><P | |
163 >Returns a pointer to an initialized semaphore or | |
164 <SPAN | |
165 CLASS="RETURNVALUE" | |
166 >NULL</SPAN | |
167 > if there was an error.</P | |
168 ></DIV | |
169 ><DIV | |
170 CLASS="REFSECT1" | |
171 ><A | |
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172 NAME="AEN7959" |
0 | 173 ></A |
174 ><H2 | |
175 >Examples</H2 | |
176 ><P | |
177 ><PRE | |
178 CLASS="PROGRAMLISTING" | |
179 >SDL_sem *my_sem; | |
180 | |
181 my_sem = SDL_CreateSemaphore(INITIAL_SEM_VALUE); | |
182 | |
183 if (my_sem == NULL) { | |
184 return CREATE_SEM_FAILED; | |
185 }</PRE | |
186 ></P | |
187 ></DIV | |
188 ><DIV | |
189 CLASS="REFSECT1" | |
190 ><A | |
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191 NAME="AEN7963" |
0 | 192 ></A |
193 ><H2 | |
194 >See Also</H2 | |
195 ><P | |
196 ><A | |
197 HREF="sdldestroysemaphore.html" | |
198 ><TT | |
199 CLASS="FUNCTION" | |
200 >SDL_DestroySemaphore</TT | |
201 ></A | |
202 >, | |
203 <A | |
204 HREF="sdlsemwait.html" | |
205 ><TT | |
206 CLASS="FUNCTION" | |
207 >SDL_SemWait</TT | |
208 ></A | |
209 >, | |
210 <A | |
211 HREF="sdlsemtrywait.html" | |
212 ><TT | |
213 CLASS="FUNCTION" | |
214 >SDL_SemTryWait</TT | |
215 ></A | |
216 >, | |
217 <A | |
218 HREF="sdlsemwaittimeout.html" | |
219 ><TT | |
220 CLASS="FUNCTION" | |
221 >SDL_SemWaitTimeout</TT | |
222 ></A | |
223 >, | |
224 <A | |
225 HREF="sdlsempost.html" | |
226 ><TT | |
227 CLASS="FUNCTION" | |
228 >SDL_SemPost</TT | |
229 ></A | |
230 >, | |
231 <A | |
232 HREF="sdlsemvalue.html" | |
233 ><TT | |
234 CLASS="FUNCTION" | |
235 >SDL_SemValue</TT | |
236 ></A | |
237 ></P | |
238 ></DIV | |
239 ><DIV | |
240 CLASS="NAVFOOTER" | |
241 ><HR | |
242 ALIGN="LEFT" | |
243 WIDTH="100%"><TABLE | |
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244 SUMMARY="Footer navigation table" |
0 | 245 WIDTH="100%" |
246 BORDER="0" | |
247 CELLPADDING="0" | |
248 CELLSPACING="0" | |
249 ><TR | |
250 ><TD | |
251 WIDTH="33%" | |
252 ALIGN="left" | |
253 VALIGN="top" | |
254 ><A | |
255 HREF="sdlmutexv.html" | |
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256 ACCESSKEY="P" |
0 | 257 >Prev</A |
258 ></TD | |
259 ><TD | |
260 WIDTH="34%" | |
261 ALIGN="center" | |
262 VALIGN="top" | |
263 ><A | |
264 HREF="index.html" | |
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265 ACCESSKEY="H" |
0 | 266 >Home</A |
267 ></TD | |
268 ><TD | |
269 WIDTH="33%" | |
270 ALIGN="right" | |
271 VALIGN="top" | |
272 ><A | |
273 HREF="sdldestroysemaphore.html" | |
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274 ACCESSKEY="N" |
0 | 275 >Next</A |
276 ></TD | |
277 ></TR | |
278 ><TR | |
279 ><TD | |
280 WIDTH="33%" | |
281 ALIGN="left" | |
282 VALIGN="top" | |
283 >SDL_mutexV</TD | |
284 ><TD | |
285 WIDTH="34%" | |
286 ALIGN="center" | |
287 VALIGN="top" | |
288 ><A | |
289 HREF="thread.html" | |
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290 ACCESSKEY="U" |
0 | 291 >Up</A |
292 ></TD | |
293 ><TD | |
294 WIDTH="33%" | |
295 ALIGN="right" | |
296 VALIGN="top" | |
297 >SDL_DestroySemaphore</TD | |
298 ></TR | |
299 ></TABLE | |
300 ></DIV | |
301 ></BODY | |
302 ></HTML | |
303 > |