Mercurial > sdl-ios-xcode
annotate docs/html/sdlmutexp.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> |
|---|---|
| date | Sun, 18 Oct 2009 17:31:37 +0000 |
| parents | 355632dca928 |
| children |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_mutexP</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_DestroyMutex" | |
| 17 HREF="sdldestroymutex.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_mutexV" | |
| 20 HREF="sdlmutexv.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="sdldestroymutex.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="sdlmutexv.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="SDLMUTEXP" | |
|
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74 ></A |
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75 >SDL_mutexP</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN7872" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_mutexP -- Lock a mutex</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN7875" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN7876" |
| 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_mutexP</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="AEN7882" |
| 0 | 120 ></A |
| 121 ><H2 | |
| 122 >Description</H2 | |
| 123 ><P | |
| 124 >Locks 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 >. If the mutex is already locked then <TT | |
| 136 CLASS="FUNCTION" | |
| 137 >SDL_mutexP</TT | |
| 138 > will not return until it is <A | |
| 139 HREF="sdlmutexv.html" | |
| 140 >unlocked</A | |
| 141 >. Returns <SPAN | |
| 142 CLASS="RETURNVALUE" | |
| 143 >0</SPAN | |
| 144 > on success, or <SPAN | |
| 145 CLASS="RETURNVALUE" | |
| 146 >-1</SPAN | |
| 147 > on an error.</P | |
| 148 ><P | |
| 149 >SDL also defines a macro <TT | |
| 150 CLASS="LITERAL" | |
| 151 >#define SDL_LockMutex(m) SDL_mutexP(m)</TT | |
| 152 >.</P | |
| 153 ></DIV | |
| 154 ><DIV | |
| 155 CLASS="REFSECT1" | |
| 156 ><A | |
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157 NAME="AEN7894" |
| 0 | 158 ></A |
| 159 ><H2 | |
| 160 >See Also</H2 | |
| 161 ><P | |
| 162 ><A | |
| 163 HREF="sdlcreatemutex.html" | |
| 164 ><TT | |
| 165 CLASS="FUNCTION" | |
| 166 >SDL_CreateMutex</TT | |
| 167 ></A | |
| 168 >, | |
| 169 <A | |
| 170 HREF="sdlmutexv.html" | |
| 171 ><TT | |
| 172 CLASS="FUNCTION" | |
| 173 >SDL_mutexV</TT | |
| 174 ></A | |
| 175 ></P | |
| 176 ></DIV | |
| 177 ><DIV | |
| 178 CLASS="NAVFOOTER" | |
| 179 ><HR | |
| 180 ALIGN="LEFT" | |
| 181 WIDTH="100%"><TABLE | |
|
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parents:
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182 SUMMARY="Footer navigation table" |
| 0 | 183 WIDTH="100%" |
| 184 BORDER="0" | |
| 185 CELLPADDING="0" | |
| 186 CELLSPACING="0" | |
| 187 ><TR | |
| 188 ><TD | |
| 189 WIDTH="33%" | |
| 190 ALIGN="left" | |
| 191 VALIGN="top" | |
| 192 ><A | |
| 193 HREF="sdldestroymutex.html" | |
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803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
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194 ACCESSKEY="P" |
| 0 | 195 >Prev</A |
| 196 ></TD | |
| 197 ><TD | |
| 198 WIDTH="34%" | |
| 199 ALIGN="center" | |
| 200 VALIGN="top" | |
| 201 ><A | |
| 202 HREF="index.html" | |
|
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
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203 ACCESSKEY="H" |
| 0 | 204 >Home</A |
| 205 ></TD | |
| 206 ><TD | |
| 207 WIDTH="33%" | |
| 208 ALIGN="right" | |
| 209 VALIGN="top" | |
| 210 ><A | |
| 211 HREF="sdlmutexv.html" | |
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803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
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212 ACCESSKEY="N" |
| 0 | 213 >Next</A |
| 214 ></TD | |
| 215 ></TR | |
| 216 ><TR | |
| 217 ><TD | |
| 218 WIDTH="33%" | |
| 219 ALIGN="left" | |
| 220 VALIGN="top" | |
| 221 >SDL_DestroyMutex</TD | |
| 222 ><TD | |
| 223 WIDTH="34%" | |
| 224 ALIGN="center" | |
| 225 VALIGN="top" | |
| 226 ><A | |
| 227 HREF="thread.html" | |
|
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
228 ACCESSKEY="U" |
| 0 | 229 >Up</A |
| 230 ></TD | |
| 231 ><TD | |
| 232 WIDTH="33%" | |
| 233 ALIGN="right" | |
| 234 VALIGN="top" | |
| 235 >SDL_mutexV</TD | |
| 236 ></TR | |
| 237 ></TABLE | |
| 238 ></DIV | |
| 239 ></BODY | |
| 240 ></HTML | |
| 241 > |