Mercurial > sdl-ios-xcode
annotate docs/html/sdlcreatesemaphore.html @ 983:7f08bd66f1ca
Date: Fri, 19 Nov 2004 06:23:53 -0800 (PST)
From: Eric Wing
Subject: OS X Mouse inversion problem fix (again)
Here's yet another patch for the OS X mouse inversion
problem. This should fix the problem once and for all.
I know I've said this before, but *This time for
sure!* :)
If you recall, my last patch broke the non-OpenGL
windowed code and caused the inversion to occur there
instead. Max submitted a patch that partially reverted
the changes back which included the os version hack
which is currently the most recent CVS.
Aaron Sullivan identified and reported to the mailing
list the other day, that the last partial regression
of the code broke OS X 10.2. Looking over the results,
I'm thinking that I was slightly more successful than
I thought at unifying the code. I think I was trying
to unify the code base for OpenGL and non-OpenGL
windowed modes for all versions of the OS. It looks
like I failed at at unifying the OpenGL and non-OpenGL
code, but I did succeed at unifying the OS versions.
Thus, we no longer need the hack for the OS version
checks. The partial regression still included an OS
check which is what broke things for < 10.3.
Attached is the patch for SDL_QuartzWM.m. It basically
is a half-line change that removes one of the two
checks that decides if the mouse coordinates need to
be inverted, i.e:
if (system_version >= 0x1030 &&
(SDL_VideoSurface->flags & SDL_OPENGL) )
becomes this:
if(SDL_VideoSurface->flags & SDL_OPENGL)
With Aaron's outstanding help, we have collectively
tested:
windowed OpenGL
windowed non-OpenGL
fullscreen OpenGL
fullscreen non-OpenGL
under OS X 10.2 (Jaguar), 10.3 (Panther), and 10.4
(Tiger).
We don't have access to 10.0 or 10.1, but since the
original problem didn't materialize until 10.3, I'm
hopeful that testing 10.2 is sufficient. And now that
the code is uniform, I'm also hoping we'll be safe
moving forward to deal with future revisions of the OS
with this issue.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 21 Nov 2004 00:57:47 +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 > |