Mercurial > sdl-ios-xcode
annotate docs/html/sdlcreatemutex.html @ 1555:780fd5b61df1
Fixed bug #89
Date: Sun, 23 Oct 2005 16:39:03 +0200
From: "A. Schmid" <sahib@phreaker.net>
Subject: [SDL] no software surfaces with svgalib driver?
Hi,
I noticed that the SDL (1.2.9) svgalib driver only makes use of linear
addressable (framebuffer) video modes. On older systems (like one of
mine), linear addressable modes are often not available.
Especially for cards with VESA VBE < 2.0 the svgalib vesa driver is
unusable, since VESA only supports framebuffering for VBE 2.0 and later.
The changes necessary to add support for software surfaces seem to be
relatively small. I only had to hack src/video/svga/SDL_svgavideo.c (see
attached patch). The code worked fine for me, but it is no more than a
proof of concept and should be reviewed (probably has a memory leak when
switching modes). It also uses the vgagl library (included in the
svgalib package) and needs to be linked against it.
-Alex
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 19 Mar 2006 12:05:16 +0000 |
parents | 355632dca928 |
children |
rev | line source |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_CreateMutex</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_KillThread" | |
17 HREF="sdlkillthread.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_DestroyMutex" | |
20 HREF="sdldestroymutex.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="sdlkillthread.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="sdldestroymutex.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="SDLCREATEMUTEX" | |
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74 ></A |
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75 >SDL_CreateMutex</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
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79 NAME="AEN7820" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_CreateMutex -- Create a mutex</DIV | |
84 ><DIV | |
85 CLASS="REFSYNOPSISDIV" | |
86 ><A | |
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87 NAME="AEN7823" |
0 | 88 ></A |
89 ><H2 | |
90 >Synopsis</H2 | |
91 ><DIV | |
92 CLASS="FUNCSYNOPSIS" | |
93 ><A | |
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94 NAME="AEN7824" |
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_mutex *<B | |
107 CLASS="FSFUNC" | |
108 >SDL_CreateMutex</B | |
109 ></CODE | |
110 >(void);</CODE | |
111 ></P | |
112 ><P | |
113 ></P | |
114 ></DIV | |
115 ></DIV | |
116 ><DIV | |
117 CLASS="REFSECT1" | |
118 ><A | |
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119 NAME="AEN7830" |
0 | 120 ></A |
121 ><H2 | |
122 >Description</H2 | |
123 ><P | |
124 >Create a new, unlocked mutex.</P | |
125 ></DIV | |
126 ><DIV | |
127 CLASS="REFSECT1" | |
128 ><A | |
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129 NAME="AEN7833" |
0 | 130 ></A |
131 ><H2 | |
132 >Examples</H2 | |
133 ><PRE | |
134 CLASS="PROGRAMLISTING" | |
135 >SDL_mutex *mut; | |
136 | |
137 mut=SDL_CreateMutex(); | |
138 . | |
139 . | |
140 if(SDL_mutexP(mut)==-1){ | |
141 fprintf(stderr, "Couldn't lock mutex\n"); | |
142 exit(-1); | |
143 } | |
144 . | |
145 /* Do stuff while mutex is locked */ | |
146 . | |
147 . | |
148 if(SDL_mutexV(mut)==-1){ | |
149 fprintf(stderr, "Couldn't unlock mutex\n"); | |
150 exit(-1); | |
151 } | |
152 | |
153 SDL_DestroyMutex(mut); </PRE | |
154 ></DIV | |
155 ><DIV | |
156 CLASS="REFSECT1" | |
157 ><A | |
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158 NAME="AEN7836" |
0 | 159 ></A |
160 ><H2 | |
161 >See Also</H2 | |
162 ><P | |
163 ><A | |
164 HREF="sdlmutexp.html" | |
165 ><TT | |
166 CLASS="FUNCTION" | |
167 >SDL_mutexP</TT | |
168 ></A | |
169 >, | |
170 <A | |
171 HREF="sdlmutexv.html" | |
172 ><TT | |
173 CLASS="FUNCTION" | |
174 >SDL_mutexV</TT | |
175 ></A | |
176 >, | |
177 <A | |
178 HREF="sdldestroymutex.html" | |
179 ><TT | |
180 CLASS="FUNCTION" | |
181 >SDL_DestroyMutex</TT | |
182 ></A | |
183 ></P | |
184 ></DIV | |
185 ><DIV | |
186 CLASS="NAVFOOTER" | |
187 ><HR | |
188 ALIGN="LEFT" | |
189 WIDTH="100%"><TABLE | |
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parents:
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190 SUMMARY="Footer navigation table" |
0 | 191 WIDTH="100%" |
192 BORDER="0" | |
193 CELLPADDING="0" | |
194 CELLSPACING="0" | |
195 ><TR | |
196 ><TD | |
197 WIDTH="33%" | |
198 ALIGN="left" | |
199 VALIGN="top" | |
200 ><A | |
201 HREF="sdlkillthread.html" | |
803
355632dca928
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parents:
181
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202 ACCESSKEY="P" |
0 | 203 >Prev</A |
204 ></TD | |
205 ><TD | |
206 WIDTH="34%" | |
207 ALIGN="center" | |
208 VALIGN="top" | |
209 ><A | |
210 HREF="index.html" | |
803
355632dca928
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parents:
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211 ACCESSKEY="H" |
0 | 212 >Home</A |
213 ></TD | |
214 ><TD | |
215 WIDTH="33%" | |
216 ALIGN="right" | |
217 VALIGN="top" | |
218 ><A | |
219 HREF="sdldestroymutex.html" | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
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220 ACCESSKEY="N" |
0 | 221 >Next</A |
222 ></TD | |
223 ></TR | |
224 ><TR | |
225 ><TD | |
226 WIDTH="33%" | |
227 ALIGN="left" | |
228 VALIGN="top" | |
229 >SDL_KillThread</TD | |
230 ><TD | |
231 WIDTH="34%" | |
232 ALIGN="center" | |
233 VALIGN="top" | |
234 ><A | |
235 HREF="thread.html" | |
803
355632dca928
Updated SDL HTML documentation
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parents:
181
diff
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236 ACCESSKEY="U" |
0 | 237 >Up</A |
238 ></TD | |
239 ><TD | |
240 WIDTH="33%" | |
241 ALIGN="right" | |
242 VALIGN="top" | |
243 >SDL_DestroyMutex</TD | |
244 ></TR | |
245 ></TABLE | |
246 ></DIV | |
247 ></BODY | |
248 ></HTML | |
249 > |