Mercurial > sdl-ios-xcode
annotate docs/html/sdlcreatesemaphore.html @ 4215:d83830711a5b SDL-1.2
Fixed bug #615
Scott McCreary 2008-08-21 10:48:14 PDT
This patch adds support for Haiku.
http://ports.haiku-files.org/browser/haikuports/trunk/media-libs/libsdl/SDL-1.2.13-haiku.diff
Haiku is an open-source recreation of BeOS. It has better POSIX compliance
than beOS did, and other improved features, which in some cases causes us to
have to "undo" previous BeOS workarounds.
Here's our port log entry for it, showing the steps to force the changes into
configure and Makefile:
http://ports.haiku-files.org/wiki/media-libs/libsdl/1.2.13/1
Note that this was only tried on 1.2.13 stable so far.
Haiku is using a newer config.guess / config.sub that doesn't yet seem to be in
the released libtool, so we are having to copy it in for now.
http://haiku-files.org/files/optional-packages/
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 21 Sep 2009 09:18:42 +0000 |
| parents | 355632dca928 |
| children |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_CreateSemaphore</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_mutexV" | |
| 17 HREF="sdlmutexv.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_DestroySemaphore" | |
| 20 HREF="sdldestroysemaphore.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="sdlmutexv.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="sdldestroysemaphore.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="SDLCREATESEMAPHORE" | |
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74 ></A |
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75 >SDL_CreateSemaphore</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN7936" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_CreateSemaphore -- Creates a new semaphore and assigns an initial value to it.</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN7939" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN7940" |
| 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_sem *<B | |
| 107 CLASS="FSFUNC" | |
| 108 >SDL_CreateSemaphore</B | |
| 109 ></CODE | |
| 110 >(Uint32 initial_value);</CODE | |
| 111 ></P | |
| 112 ><P | |
| 113 ></P | |
| 114 ></DIV | |
| 115 ></DIV | |
| 116 ><DIV | |
| 117 CLASS="REFSECT1" | |
| 118 ><A | |
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119 NAME="AEN7946" |
| 0 | 120 ></A |
| 121 ><H2 | |
| 122 >Description</H2 | |
| 123 ><P | |
| 124 ><TT | |
| 125 CLASS="FUNCTION" | |
| 126 >SDL_CreateSemaphore()</TT | |
| 127 > creates a new semaphore and | |
| 128 initializes it with the value <TT | |
| 129 CLASS="PARAMETER" | |
| 130 ><I | |
| 131 >initial_value</I | |
| 132 ></TT | |
| 133 >. | |
| 134 Each locking operation on the semaphore by | |
| 135 <A | |
| 136 HREF="sdlsemwait.html" | |
| 137 >SDL_SemWait</A | |
| 138 >, | |
| 139 <A | |
| 140 HREF="sdlsemtrywait.html" | |
| 141 >SDL_SemTryWait</A | |
| 142 > or | |
| 143 <A | |
| 144 HREF="sdlsemwaittimeout.html" | |
| 145 >SDL_SemWaitTimeout</A | |
| 146 > | |
| 147 will atomically decrement the semaphore value. The locking operation will be blocked | |
| 148 if the semaphore value is not positive (greater than zero). Each unlock operation by | |
| 149 <A | |
| 150 HREF="sdlsempost.html" | |
| 151 >SDL_SemPost</A | |
| 152 > | |
| 153 will atomically increment the semaphore value.</P | |
| 154 ></DIV | |
| 155 ><DIV | |
| 156 CLASS="REFSECT1" | |
| 157 ><A | |
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158 NAME="AEN7955" |
| 0 | 159 ></A |
| 160 ><H2 | |
| 161 >Return Value</H2 | |
| 162 ><P | |
| 163 >Returns a pointer to an initialized semaphore or | |
| 164 <SPAN | |
| 165 CLASS="RETURNVALUE" | |
| 166 >NULL</SPAN | |
| 167 > if there was an error.</P | |
| 168 ></DIV | |
| 169 ><DIV | |
| 170 CLASS="REFSECT1" | |
| 171 ><A | |
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172 NAME="AEN7959" |
| 0 | 173 ></A |
| 174 ><H2 | |
| 175 >Examples</H2 | |
| 176 ><P | |
| 177 ><PRE | |
| 178 CLASS="PROGRAMLISTING" | |
| 179 >SDL_sem *my_sem; | |
| 180 | |
| 181 my_sem = SDL_CreateSemaphore(INITIAL_SEM_VALUE); | |
| 182 | |
| 183 if (my_sem == NULL) { | |
| 184 return CREATE_SEM_FAILED; | |
| 185 }</PRE | |
| 186 ></P | |
| 187 ></DIV | |
| 188 ><DIV | |
| 189 CLASS="REFSECT1" | |
| 190 ><A | |
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191 NAME="AEN7963" |
| 0 | 192 ></A |
| 193 ><H2 | |
| 194 >See Also</H2 | |
| 195 ><P | |
| 196 ><A | |
| 197 HREF="sdldestroysemaphore.html" | |
| 198 ><TT | |
| 199 CLASS="FUNCTION" | |
| 200 >SDL_DestroySemaphore</TT | |
| 201 ></A | |
| 202 >, | |
| 203 <A | |
| 204 HREF="sdlsemwait.html" | |
| 205 ><TT | |
| 206 CLASS="FUNCTION" | |
| 207 >SDL_SemWait</TT | |
| 208 ></A | |
| 209 >, | |
| 210 <A | |
| 211 HREF="sdlsemtrywait.html" | |
| 212 ><TT | |
| 213 CLASS="FUNCTION" | |
| 214 >SDL_SemTryWait</TT | |
| 215 ></A | |
| 216 >, | |
| 217 <A | |
| 218 HREF="sdlsemwaittimeout.html" | |
| 219 ><TT | |
| 220 CLASS="FUNCTION" | |
| 221 >SDL_SemWaitTimeout</TT | |
| 222 ></A | |
| 223 >, | |
| 224 <A | |
| 225 HREF="sdlsempost.html" | |
| 226 ><TT | |
| 227 CLASS="FUNCTION" | |
| 228 >SDL_SemPost</TT | |
| 229 ></A | |
| 230 >, | |
| 231 <A | |
| 232 HREF="sdlsemvalue.html" | |
| 233 ><TT | |
| 234 CLASS="FUNCTION" | |
| 235 >SDL_SemValue</TT | |
| 236 ></A | |
| 237 ></P | |
| 238 ></DIV | |
| 239 ><DIV | |
| 240 CLASS="NAVFOOTER" | |
| 241 ><HR | |
| 242 ALIGN="LEFT" | |
| 243 WIDTH="100%"><TABLE | |
|
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244 SUMMARY="Footer navigation table" |
| 0 | 245 WIDTH="100%" |
| 246 BORDER="0" | |
| 247 CELLPADDING="0" | |
| 248 CELLSPACING="0" | |
| 249 ><TR | |
| 250 ><TD | |
| 251 WIDTH="33%" | |
| 252 ALIGN="left" | |
| 253 VALIGN="top" | |
| 254 ><A | |
| 255 HREF="sdlmutexv.html" | |
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256 ACCESSKEY="P" |
| 0 | 257 >Prev</A |
| 258 ></TD | |
| 259 ><TD | |
| 260 WIDTH="34%" | |
| 261 ALIGN="center" | |
| 262 VALIGN="top" | |
| 263 ><A | |
| 264 HREF="index.html" | |
|
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265 ACCESSKEY="H" |
| 0 | 266 >Home</A |
| 267 ></TD | |
| 268 ><TD | |
| 269 WIDTH="33%" | |
| 270 ALIGN="right" | |
| 271 VALIGN="top" | |
| 272 ><A | |
| 273 HREF="sdldestroysemaphore.html" | |
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274 ACCESSKEY="N" |
| 0 | 275 >Next</A |
| 276 ></TD | |
| 277 ></TR | |
| 278 ><TR | |
| 279 ><TD | |
| 280 WIDTH="33%" | |
| 281 ALIGN="left" | |
| 282 VALIGN="top" | |
| 283 >SDL_mutexV</TD | |
| 284 ><TD | |
| 285 WIDTH="34%" | |
| 286 ALIGN="center" | |
| 287 VALIGN="top" | |
| 288 ><A | |
| 289 HREF="thread.html" | |
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290 ACCESSKEY="U" |
| 0 | 291 >Up</A |
| 292 ></TD | |
| 293 ><TD | |
| 294 WIDTH="33%" | |
| 295 ALIGN="right" | |
| 296 VALIGN="top" | |
| 297 >SDL_DestroySemaphore</TD | |
| 298 ></TR | |
| 299 ></TABLE | |
| 300 ></DIV | |
| 301 ></BODY | |
| 302 ></HTML | |
| 303 > |