Mercurial > sdl-ios-xcode
annotate docs/html/sdlmutexv.html @ 4355:9b464226e541 SDL-1.2
Fixed bug #855
Ludwig Nussel 2009-10-18 06:31:52 PDT
an mprotect call was added to fix bug 528. However that results in a buffer
that allows writing and code execution. Ie the no-execute security features of
modern operating systems are defeated this way. Two mprotect calls are needed.
One to make the buffer executable but not writeable when done and another one
to make the buffer writeable again if the content needs to be changed.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 18 Oct 2009 17:31:37 +0000 |
parents | 355632dca928 |
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rev | line source |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_mutexV</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_mutexP" | |
17 HREF="sdlmutexp.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_CreateSemaphore" | |
20 HREF="sdlcreatesemaphore.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="sdlmutexp.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="sdlcreatesemaphore.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="SDLMUTEXV" | |
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74 ></A |
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75 >SDL_mutexV</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
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79 NAME="AEN7905" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_mutexV -- Unlock a mutex</DIV | |
84 ><DIV | |
85 CLASS="REFSYNOPSISDIV" | |
86 ><A | |
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87 NAME="AEN7908" |
0 | 88 ></A |
89 ><H2 | |
90 >Synopsis</H2 | |
91 ><DIV | |
92 CLASS="FUNCSYNOPSIS" | |
93 ><A | |
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94 NAME="AEN7909" |
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_mutexV</B | |
109 ></CODE | |
110 >(SDL_mutex *mutex);</CODE | |
111 ></P | |
112 ><P | |
113 ></P | |
114 ></DIV | |
115 ></DIV | |
116 ><DIV | |
117 CLASS="REFSECT1" | |
118 ><A | |
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119 NAME="AEN7915" |
0 | 120 ></A |
121 ><H2 | |
122 >Description</H2 | |
123 ><P | |
124 >Unlocks the <TT | |
125 CLASS="PARAMETER" | |
126 ><I | |
127 >mutex</I | |
128 ></TT | |
129 >, which was previously created with <A | |
130 HREF="sdlcreatemutex.html" | |
131 ><TT | |
132 CLASS="FUNCTION" | |
133 >SDL_CreateMutex</TT | |
134 ></A | |
135 >. Returns <SPAN | |
136 CLASS="RETURNVALUE" | |
137 >0</SPAN | |
138 > on success, or <SPAN | |
139 CLASS="RETURNVALUE" | |
140 >-1</SPAN | |
141 > on an error.</P | |
142 ><P | |
143 >SDL also defines a macro <TT | |
144 CLASS="LITERAL" | |
145 >#define SDL_UnlockMutex(m) SDL_mutexV(m)</TT | |
146 >.</P | |
147 ></DIV | |
148 ><DIV | |
149 CLASS="REFSECT1" | |
150 ><A | |
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151 NAME="AEN7925" |
0 | 152 ></A |
153 ><H2 | |
154 >See Also</H2 | |
155 ><P | |
156 ><A | |
157 HREF="sdlcreatemutex.html" | |
158 ><TT | |
159 CLASS="FUNCTION" | |
160 >SDL_CreateMutex</TT | |
161 ></A | |
162 >, | |
163 <A | |
164 HREF="sdlmutexp.html" | |
165 ><TT | |
166 CLASS="FUNCTION" | |
167 >SDL_mutexP</TT | |
168 ></A | |
169 ></P | |
170 ></DIV | |
171 ><DIV | |
172 CLASS="NAVFOOTER" | |
173 ><HR | |
174 ALIGN="LEFT" | |
175 WIDTH="100%"><TABLE | |
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176 SUMMARY="Footer navigation table" |
0 | 177 WIDTH="100%" |
178 BORDER="0" | |
179 CELLPADDING="0" | |
180 CELLSPACING="0" | |
181 ><TR | |
182 ><TD | |
183 WIDTH="33%" | |
184 ALIGN="left" | |
185 VALIGN="top" | |
186 ><A | |
187 HREF="sdlmutexp.html" | |
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188 ACCESSKEY="P" |
0 | 189 >Prev</A |
190 ></TD | |
191 ><TD | |
192 WIDTH="34%" | |
193 ALIGN="center" | |
194 VALIGN="top" | |
195 ><A | |
196 HREF="index.html" | |
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197 ACCESSKEY="H" |
0 | 198 >Home</A |
199 ></TD | |
200 ><TD | |
201 WIDTH="33%" | |
202 ALIGN="right" | |
203 VALIGN="top" | |
204 ><A | |
205 HREF="sdlcreatesemaphore.html" | |
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parents:
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206 ACCESSKEY="N" |
0 | 207 >Next</A |
208 ></TD | |
209 ></TR | |
210 ><TR | |
211 ><TD | |
212 WIDTH="33%" | |
213 ALIGN="left" | |
214 VALIGN="top" | |
215 >SDL_mutexP</TD | |
216 ><TD | |
217 WIDTH="34%" | |
218 ALIGN="center" | |
219 VALIGN="top" | |
220 ><A | |
221 HREF="thread.html" | |
803
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parents:
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222 ACCESSKEY="U" |
0 | 223 >Up</A |
224 ></TD | |
225 ><TD | |
226 WIDTH="33%" | |
227 ALIGN="right" | |
228 VALIGN="top" | |
229 >SDL_CreateSemaphore</TD | |
230 ></TR | |
231 ></TABLE | |
232 ></DIV | |
233 ></BODY | |
234 ></HTML | |
235 > |