Mercurial > sdl-ios-xcode
annotate docs/html/sdlsemwait.html @ 2185:2032348afed1
This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
available and to keep people form having to install yet another library I have added the essential parts of Xmu in
src/video/extensions/XmuStdCmap and an include file in src/video/extensions. The support makes use of standard X11 mechanisms to
create color maps and make sure that an application uses the same color map for each window/visual combination. This should make it
possible for gamma support to be implemented based on a single color map per application.
Hurm... it looks like "make indent" modified a few extra files. Those are getting committed too.
| author | Bob Pendleton <bob@pendleton.com> |
|---|---|
| date | Thu, 12 Jul 2007 20:00:50 +0000 |
| parents | 355632dca928 |
| children |
| rev | line source |
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| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_SemWait</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_DestroySemaphore" | |
| 17 HREF="sdldestroysemaphore.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_SemTryWait" | |
| 20 HREF="sdlsemtrywait.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="sdldestroysemaphore.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="sdlsemtrywait.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="SDLSEMWAIT" | |
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74 ></A |
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75 >SDL_SemWait</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN8023" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_SemWait -- Lock a semaphore and suspend the thread if the semaphore value is zero.</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN8026" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN8027" |
| 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_SemWait</B | |
| 109 ></CODE | |
| 110 >(SDL_sem *sem);</CODE | |
| 111 ></P | |
| 112 ><P | |
| 113 ></P | |
| 114 ></DIV | |
| 115 ></DIV | |
| 116 ><DIV | |
| 117 CLASS="REFSECT1" | |
| 118 ><A | |
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119 NAME="AEN8033" |
| 0 | 120 ></A |
| 121 ><H2 | |
| 122 >Description</H2 | |
| 123 ><P | |
| 124 ><TT | |
| 125 CLASS="FUNCTION" | |
| 126 >SDL_SemWait()</TT | |
| 127 > suspends the calling thread until either | |
| 128 the semaphore pointed to by <TT | |
| 129 CLASS="PARAMETER" | |
| 130 ><I | |
| 131 >sem</I | |
| 132 ></TT | |
| 133 > has a positive value, | |
| 134 the call is interrupted by a signal or error. If the call is successful it | |
| 135 will atomically decrement the semaphore value.</P | |
| 136 ><P | |
| 137 >After <TT | |
| 138 CLASS="FUNCTION" | |
| 139 >SDL_SemWait()</TT | |
| 140 > is successful, the semaphore | |
| 141 can be released and its count atomically incremented by a successful call to | |
| 142 <A | |
| 143 HREF="sdlsempost.html" | |
| 144 >SDL_SemPost</A | |
| 145 >.</P | |
| 146 ></DIV | |
| 147 ><DIV | |
| 148 CLASS="REFSECT1" | |
| 149 ><A | |
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150 NAME="AEN8041" |
| 0 | 151 ></A |
| 152 ><H2 | |
| 153 >Return Value</H2 | |
| 154 ><P | |
| 155 >Returns <SPAN | |
| 156 CLASS="RETURNVALUE" | |
| 157 >0</SPAN | |
| 158 > if successful or | |
| 159 <SPAN | |
| 160 CLASS="RETURNVALUE" | |
| 161 >-1</SPAN | |
| 162 > if there was an error (leaving the semaphore unchanged).</P | |
| 163 ></DIV | |
| 164 ><DIV | |
| 165 CLASS="REFSECT1" | |
| 166 ><A | |
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167 NAME="AEN8046" |
| 0 | 168 ></A |
| 169 ><H2 | |
| 170 >Examples</H2 | |
| 171 ><P | |
| 172 ><PRE | |
| 173 CLASS="PROGRAMLISTING" | |
| 174 >if (SDL_SemWait(my_sem) == -1) { | |
| 175 return WAIT_FAILED; | |
| 176 } | |
| 177 | |
| 178 ... | |
| 179 | |
| 180 SDL_SemPost(my_sem);</PRE | |
| 181 ></P | |
| 182 ></DIV | |
| 183 ><DIV | |
| 184 CLASS="REFSECT1" | |
| 185 ><A | |
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186 NAME="AEN8050" |
| 0 | 187 ></A |
| 188 ><H2 | |
| 189 >See Also</H2 | |
| 190 ><P | |
| 191 ><A | |
| 192 HREF="sdlcreatesemaphore.html" | |
| 193 ><TT | |
| 194 CLASS="FUNCTION" | |
| 195 >SDL_CreateSemaphore</TT | |
| 196 ></A | |
| 197 >, | |
| 198 <A | |
| 199 HREF="sdldestroysemaphore.html" | |
| 200 ><TT | |
| 201 CLASS="FUNCTION" | |
| 202 >SDL_DestroySemaphore</TT | |
| 203 ></A | |
| 204 >, | |
| 205 <A | |
| 206 HREF="sdlsemtrywait.html" | |
| 207 ><TT | |
| 208 CLASS="FUNCTION" | |
| 209 >SDL_SemTryWait</TT | |
| 210 ></A | |
| 211 >, | |
| 212 <A | |
| 213 HREF="sdlsemwaittimeout.html" | |
| 214 ><TT | |
| 215 CLASS="FUNCTION" | |
| 216 >SDL_SemWaitTimeout</TT | |
| 217 ></A | |
| 218 >, | |
| 219 <A | |
| 220 HREF="sdlsempost.html" | |
| 221 ><TT | |
| 222 CLASS="FUNCTION" | |
| 223 >SDL_SemPost</TT | |
| 224 ></A | |
| 225 >, | |
| 226 <A | |
| 227 HREF="sdlsemvalue.html" | |
| 228 ><TT | |
| 229 CLASS="FUNCTION" | |
| 230 >SDL_SemValue</TT | |
| 231 ></A | |
| 232 ></P | |
| 233 ></DIV | |
| 234 ><DIV | |
| 235 CLASS="NAVFOOTER" | |
| 236 ><HR | |
| 237 ALIGN="LEFT" | |
| 238 WIDTH="100%"><TABLE | |
|
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239 SUMMARY="Footer navigation table" |
| 0 | 240 WIDTH="100%" |
| 241 BORDER="0" | |
| 242 CELLPADDING="0" | |
| 243 CELLSPACING="0" | |
| 244 ><TR | |
| 245 ><TD | |
| 246 WIDTH="33%" | |
| 247 ALIGN="left" | |
| 248 VALIGN="top" | |
| 249 ><A | |
| 250 HREF="sdldestroysemaphore.html" | |
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251 ACCESSKEY="P" |
| 0 | 252 >Prev</A |
| 253 ></TD | |
| 254 ><TD | |
| 255 WIDTH="34%" | |
| 256 ALIGN="center" | |
| 257 VALIGN="top" | |
| 258 ><A | |
| 259 HREF="index.html" | |
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260 ACCESSKEY="H" |
| 0 | 261 >Home</A |
| 262 ></TD | |
| 263 ><TD | |
| 264 WIDTH="33%" | |
| 265 ALIGN="right" | |
| 266 VALIGN="top" | |
| 267 ><A | |
| 268 HREF="sdlsemtrywait.html" | |
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269 ACCESSKEY="N" |
| 0 | 270 >Next</A |
| 271 ></TD | |
| 272 ></TR | |
| 273 ><TR | |
| 274 ><TD | |
| 275 WIDTH="33%" | |
| 276 ALIGN="left" | |
| 277 VALIGN="top" | |
| 278 >SDL_DestroySemaphore</TD | |
| 279 ><TD | |
| 280 WIDTH="34%" | |
| 281 ALIGN="center" | |
| 282 VALIGN="top" | |
| 283 ><A | |
| 284 HREF="thread.html" | |
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285 ACCESSKEY="U" |
| 0 | 286 >Up</A |
| 287 ></TD | |
| 288 ><TD | |
| 289 WIDTH="33%" | |
| 290 ALIGN="right" | |
| 291 VALIGN="top" | |
| 292 >SDL_SemTryWait</TD | |
| 293 ></TR | |
| 294 ></TABLE | |
| 295 ></DIV | |
| 296 ></BODY | |
| 297 ></HTML | |
| 298 > |