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annotate docs/html/sdldestroysemaphore.html @ 1295:c3e36ac8a94c
Date: Sun, 6 Mar 2005 17:06:20 +0100
From: Per Inge Mathisen
Subject: [SDL] Fullscreen refresh on win32
Windows has a terrible default for fullscreen 3D apps of 60mhz refresh
rate. This can be fixed by the user by going into his driver's
control panel and forcing the refresh rate higher. However, this not a
very user friendly way about it, and in any case SDL contains no code
that could figure out this that condition has afflicted the user.
So the question is, could SDL fix this for the user? It is possible
under Windows to request a higher refresh rate. The danger is of
course that if the user has an old monitor, and you request a too high
refresh rate, the monitor could be damaged. However, I believe there
might be a way around that: Check before switching what refresh rate
the user's desktop runs in, and if our fullscreen dimensions are equal
or less than those of the desktop, use the higher refresh rate of 60
and the desktop rate.
Since most users run their desktops in the same or higher resolution
something sane, this should fix this problem for most users.
Thoughts?
An alternative is to add an SDL_GL_GetAttribute(SDL_GL_REFRESH_RATE)
option so that programs can bitch at their users at their own
convenience.
- Per
author | Sam Lantinga <slouken@libsdl.org> |
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date | Mon, 30 Jan 2006 06:56:10 +0000 |
parents | 355632dca928 |
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rev | line source |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_DestroySemaphore</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_CreateSemaphore" | |
17 HREF="sdlcreatesemaphore.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_SemWait" | |
20 HREF="sdlsemwait.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="sdlcreatesemaphore.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="sdlsemwait.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="SDLDESTROYSEMAPHORE" | |
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74 ></A |
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75 >SDL_DestroySemaphore</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
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79 NAME="AEN7982" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_DestroySemaphore -- Destroys a semaphore that was created by <A | |
84 HREF="sdlcreatesemaphore.html" | |
85 >SDL_CreateSemaphore</A | |
86 >.</DIV | |
87 ><DIV | |
88 CLASS="REFSYNOPSISDIV" | |
89 ><A | |
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90 NAME="AEN7986" |
0 | 91 ></A |
92 ><H2 | |
93 >Synopsis</H2 | |
94 ><DIV | |
95 CLASS="FUNCSYNOPSIS" | |
96 ><A | |
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97 NAME="AEN7987" |
0 | 98 ></A |
99 ><P | |
100 ></P | |
101 ><PRE | |
102 CLASS="FUNCSYNOPSISINFO" | |
103 >#include "SDL.h" | |
104 #include "SDL_thread.h"</PRE | |
105 ><P | |
106 ><CODE | |
107 ><CODE | |
108 CLASS="FUNCDEF" | |
109 >void <B | |
110 CLASS="FSFUNC" | |
111 >SDL_DestroySemaphore</B | |
112 ></CODE | |
113 >(SDL_sem *sem);</CODE | |
114 ></P | |
115 ><P | |
116 ></P | |
117 ></DIV | |
118 ></DIV | |
119 ><DIV | |
120 CLASS="REFSECT1" | |
121 ><A | |
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122 NAME="AEN7993" |
0 | 123 ></A |
124 ><H2 | |
125 >Description</H2 | |
126 ><P | |
127 ><TT | |
128 CLASS="FUNCTION" | |
129 >SDL_DestroySemaphore</TT | |
130 > destroys the semaphore pointed to | |
131 by <TT | |
132 CLASS="PARAMETER" | |
133 ><I | |
134 >sem</I | |
135 ></TT | |
136 > that was created by | |
137 <A | |
138 HREF="sdlcreatesemaphore.html" | |
139 ><TT | |
140 CLASS="FUNCTION" | |
141 >SDL_CreateSemaphore</TT | |
142 ></A | |
143 >. | |
144 It is not safe to destroy a semaphore if there are threads currently blocked | |
145 waiting on it.</P | |
146 ></DIV | |
147 ><DIV | |
148 CLASS="REFSECT1" | |
149 ><A | |
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150 NAME="AEN8000" |
0 | 151 ></A |
152 ><H2 | |
153 >Examples</H2 | |
154 ><P | |
155 ><PRE | |
156 CLASS="PROGRAMLISTING" | |
157 >if (my_sem != NULL) { | |
158 SDL_DestroySemaphore(my_sem); | |
159 my_sem = NULL; | |
160 }</PRE | |
161 ></P | |
162 ></DIV | |
163 ><DIV | |
164 CLASS="REFSECT1" | |
165 ><A | |
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166 NAME="AEN8004" |
0 | 167 ></A |
168 ><H2 | |
169 >See Also</H2 | |
170 ><P | |
171 ><A | |
172 HREF="sdlcreatesemaphore.html" | |
173 ><TT | |
174 CLASS="FUNCTION" | |
175 >SDL_CreateSemaphore</TT | |
176 ></A | |
177 >, | |
178 <A | |
179 HREF="sdlsemwait.html" | |
180 ><TT | |
181 CLASS="FUNCTION" | |
182 >SDL_SemWait</TT | |
183 ></A | |
184 >, | |
185 <A | |
186 HREF="sdlsemtrywait.html" | |
187 ><TT | |
188 CLASS="FUNCTION" | |
189 >SDL_SemTryWait</TT | |
190 ></A | |
191 >, | |
192 <A | |
193 HREF="sdlsemwaittimeout.html" | |
194 ><TT | |
195 CLASS="FUNCTION" | |
196 >SDL_SemWaitTimeout</TT | |
197 ></A | |
198 >, | |
199 <A | |
200 HREF="sdlsempost.html" | |
201 ><TT | |
202 CLASS="FUNCTION" | |
203 >SDL_SemPost</TT | |
204 ></A | |
205 >, | |
206 <A | |
207 HREF="sdlsemvalue.html" | |
208 ><TT | |
209 CLASS="FUNCTION" | |
210 >SDL_SemValue</TT | |
211 ></A | |
212 ></P | |
213 ></DIV | |
214 ><DIV | |
215 CLASS="NAVFOOTER" | |
216 ><HR | |
217 ALIGN="LEFT" | |
218 WIDTH="100%"><TABLE | |
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219 SUMMARY="Footer navigation table" |
0 | 220 WIDTH="100%" |
221 BORDER="0" | |
222 CELLPADDING="0" | |
223 CELLSPACING="0" | |
224 ><TR | |
225 ><TD | |
226 WIDTH="33%" | |
227 ALIGN="left" | |
228 VALIGN="top" | |
229 ><A | |
230 HREF="sdlcreatesemaphore.html" | |
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231 ACCESSKEY="P" |
0 | 232 >Prev</A |
233 ></TD | |
234 ><TD | |
235 WIDTH="34%" | |
236 ALIGN="center" | |
237 VALIGN="top" | |
238 ><A | |
239 HREF="index.html" | |
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240 ACCESSKEY="H" |
0 | 241 >Home</A |
242 ></TD | |
243 ><TD | |
244 WIDTH="33%" | |
245 ALIGN="right" | |
246 VALIGN="top" | |
247 ><A | |
248 HREF="sdlsemwait.html" | |
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249 ACCESSKEY="N" |
0 | 250 >Next</A |
251 ></TD | |
252 ></TR | |
253 ><TR | |
254 ><TD | |
255 WIDTH="33%" | |
256 ALIGN="left" | |
257 VALIGN="top" | |
258 >SDL_CreateSemaphore</TD | |
259 ><TD | |
260 WIDTH="34%" | |
261 ALIGN="center" | |
262 VALIGN="top" | |
263 ><A | |
264 HREF="thread.html" | |
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265 ACCESSKEY="U" |
0 | 266 >Up</A |
267 ></TD | |
268 ><TD | |
269 WIDTH="33%" | |
270 ALIGN="right" | |
271 VALIGN="top" | |
272 >SDL_SemWait</TD | |
273 ></TR | |
274 ></TABLE | |
275 ></DIV | |
276 ></BODY | |
277 ></HTML | |
278 > |