Mercurial > sdl-ios-xcode
annotate docs/html/sdlsemwait.html @ 693:6c119628180d
Date: Sat, 16 Aug 2003 16:22:56 +0300
From: "Mike Gorchak"
Subject: Package building for QNX6
I'm just completed the package description file for QNX6 - qpg, it is like a\
.spec files for Linux. Please place SDL.qpg.in file in the root of the proj\
ect, where .spec file is placed. And sdl12qpg.diff - just adding the SDL.qpg\
.in. The same for the SDL_image. I'm planning to add .qpg files creation for\
all SDL* projects.
As for shared library building for QNX6. It is very hard to improve the exis\
ting libtool code to support QNX shared libraries. Much easyiest is to remov\
e libtool.m4 code from the acinclude.m4 for those persons, who building shar\
ed libraries for QNX6. I'm described all what they need to do with .so under\
QNX6 in the README.QNX file. And 90% of people used the precompiled librari\
es, so I think it is not big problem :)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 23 Aug 2003 23:25:46 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_SemWait</TITLE | |
| 5 ><META | |
| 6 NAME="GENERATOR" | |
|
55
55f1f1b3e27d
Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
7 CONTENT="Modular DocBook HTML Stylesheet Version 1.64 |
| 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 | |
| 31 WIDTH="100%" | |
| 32 BORDER="0" | |
| 33 CELLPADDING="0" | |
| 34 CELLSPACING="0" | |
| 35 ><TR | |
| 36 ><TH | |
| 37 COLSPAN="3" | |
| 38 ALIGN="center" | |
| 39 >SDL Library Documentation</TH | |
| 40 ></TR | |
| 41 ><TR | |
| 42 ><TD | |
| 43 WIDTH="10%" | |
| 44 ALIGN="left" | |
| 45 VALIGN="bottom" | |
| 46 ><A | |
| 47 HREF="sdldestroysemaphore.html" | |
| 48 >Prev</A | |
| 49 ></TD | |
| 50 ><TD | |
| 51 WIDTH="80%" | |
| 52 ALIGN="center" | |
| 53 VALIGN="bottom" | |
| 54 ></TD | |
| 55 ><TD | |
| 56 WIDTH="10%" | |
| 57 ALIGN="right" | |
| 58 VALIGN="bottom" | |
| 59 ><A | |
| 60 HREF="sdlsemtrywait.html" | |
| 61 >Next</A | |
| 62 ></TD | |
| 63 ></TR | |
| 64 ></TABLE | |
| 65 ><HR | |
| 66 ALIGN="LEFT" | |
| 67 WIDTH="100%"></DIV | |
| 68 ><H1 | |
| 69 ><A | |
| 70 NAME="SDLSEMWAIT" | |
| 71 >SDL_SemWait</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
76 NAME="AEN7635" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_SemWait -- Lock a semaphore and suspend the thread if the semaphore value is zero.</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
84 NAME="AEN7638" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
91 NAME="AEN7639" |
| 0 | 92 ></A |
| 93 ><P | |
| 94 ></P | |
| 95 ><PRE | |
| 96 CLASS="FUNCSYNOPSISINFO" | |
| 97 >#include "SDL.h" | |
| 98 #include "SDL_thread.h"</PRE | |
| 99 ><P | |
| 100 ><CODE | |
| 101 ><CODE | |
| 102 CLASS="FUNCDEF" | |
| 103 >int <B | |
| 104 CLASS="FSFUNC" | |
| 105 >SDL_SemWait</B | |
| 106 ></CODE | |
| 107 >(SDL_sem *sem);</CODE | |
| 108 ></P | |
| 109 ><P | |
| 110 ></P | |
| 111 ></DIV | |
| 112 ></DIV | |
| 113 ><DIV | |
| 114 CLASS="REFSECT1" | |
| 115 ><A | |
|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
116 NAME="AEN7645" |
| 0 | 117 ></A |
| 118 ><H2 | |
| 119 >Description</H2 | |
| 120 ><P | |
| 121 ><TT | |
| 122 CLASS="FUNCTION" | |
| 123 >SDL_SemWait()</TT | |
| 124 > suspends the calling thread until either | |
| 125 the semaphore pointed to by <TT | |
| 126 CLASS="PARAMETER" | |
| 127 ><I | |
| 128 >sem</I | |
| 129 ></TT | |
| 130 > has a positive value, | |
| 131 the call is interrupted by a signal or error. If the call is successful it | |
| 132 will atomically decrement the semaphore value.</P | |
| 133 ><P | |
| 134 >After <TT | |
| 135 CLASS="FUNCTION" | |
| 136 >SDL_SemWait()</TT | |
| 137 > is successful, the semaphore | |
| 138 can be released and its count atomically incremented by a successful call to | |
| 139 <A | |
| 140 HREF="sdlsempost.html" | |
| 141 >SDL_SemPost</A | |
| 142 >.</P | |
| 143 ></DIV | |
| 144 ><DIV | |
| 145 CLASS="REFSECT1" | |
| 146 ><A | |
|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
147 NAME="AEN7653" |
| 0 | 148 ></A |
| 149 ><H2 | |
| 150 >Return Value</H2 | |
| 151 ><P | |
| 152 >Returns <SPAN | |
| 153 CLASS="RETURNVALUE" | |
| 154 >0</SPAN | |
| 155 > if successful or | |
| 156 <SPAN | |
| 157 CLASS="RETURNVALUE" | |
| 158 >-1</SPAN | |
| 159 > if there was an error (leaving the semaphore unchanged).</P | |
| 160 ></DIV | |
| 161 ><DIV | |
| 162 CLASS="REFSECT1" | |
| 163 ><A | |
|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
164 NAME="AEN7658" |
| 0 | 165 ></A |
| 166 ><H2 | |
| 167 >Examples</H2 | |
| 168 ><P | |
| 169 ><PRE | |
| 170 CLASS="PROGRAMLISTING" | |
| 171 >if (SDL_SemWait(my_sem) == -1) { | |
| 172 return WAIT_FAILED; | |
| 173 } | |
| 174 | |
| 175 ... | |
| 176 | |
| 177 SDL_SemPost(my_sem);</PRE | |
| 178 ></P | |
| 179 ></DIV | |
| 180 ><DIV | |
| 181 CLASS="REFSECT1" | |
| 182 ><A | |
|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
183 NAME="AEN7662" |
| 0 | 184 ></A |
| 185 ><H2 | |
| 186 >See Also</H2 | |
| 187 ><P | |
| 188 ><A | |
| 189 HREF="sdlcreatesemaphore.html" | |
| 190 ><TT | |
| 191 CLASS="FUNCTION" | |
| 192 >SDL_CreateSemaphore</TT | |
| 193 ></A | |
| 194 >, | |
| 195 <A | |
| 196 HREF="sdldestroysemaphore.html" | |
| 197 ><TT | |
| 198 CLASS="FUNCTION" | |
| 199 >SDL_DestroySemaphore</TT | |
| 200 ></A | |
| 201 >, | |
| 202 <A | |
| 203 HREF="sdlsemtrywait.html" | |
| 204 ><TT | |
| 205 CLASS="FUNCTION" | |
| 206 >SDL_SemTryWait</TT | |
| 207 ></A | |
| 208 >, | |
| 209 <A | |
| 210 HREF="sdlsemwaittimeout.html" | |
| 211 ><TT | |
| 212 CLASS="FUNCTION" | |
| 213 >SDL_SemWaitTimeout</TT | |
| 214 ></A | |
| 215 >, | |
| 216 <A | |
| 217 HREF="sdlsempost.html" | |
| 218 ><TT | |
| 219 CLASS="FUNCTION" | |
| 220 >SDL_SemPost</TT | |
| 221 ></A | |
| 222 >, | |
| 223 <A | |
| 224 HREF="sdlsemvalue.html" | |
| 225 ><TT | |
| 226 CLASS="FUNCTION" | |
| 227 >SDL_SemValue</TT | |
| 228 ></A | |
| 229 ></P | |
| 230 ></DIV | |
| 231 ><DIV | |
| 232 CLASS="NAVFOOTER" | |
| 233 ><HR | |
| 234 ALIGN="LEFT" | |
| 235 WIDTH="100%"><TABLE | |
| 236 WIDTH="100%" | |
| 237 BORDER="0" | |
| 238 CELLPADDING="0" | |
| 239 CELLSPACING="0" | |
| 240 ><TR | |
| 241 ><TD | |
| 242 WIDTH="33%" | |
| 243 ALIGN="left" | |
| 244 VALIGN="top" | |
| 245 ><A | |
| 246 HREF="sdldestroysemaphore.html" | |
| 247 >Prev</A | |
| 248 ></TD | |
| 249 ><TD | |
| 250 WIDTH="34%" | |
| 251 ALIGN="center" | |
| 252 VALIGN="top" | |
| 253 ><A | |
| 254 HREF="index.html" | |
| 255 >Home</A | |
| 256 ></TD | |
| 257 ><TD | |
| 258 WIDTH="33%" | |
| 259 ALIGN="right" | |
| 260 VALIGN="top" | |
| 261 ><A | |
| 262 HREF="sdlsemtrywait.html" | |
| 263 >Next</A | |
| 264 ></TD | |
| 265 ></TR | |
| 266 ><TR | |
| 267 ><TD | |
| 268 WIDTH="33%" | |
| 269 ALIGN="left" | |
| 270 VALIGN="top" | |
| 271 >SDL_DestroySemaphore</TD | |
| 272 ><TD | |
| 273 WIDTH="34%" | |
| 274 ALIGN="center" | |
| 275 VALIGN="top" | |
| 276 ><A | |
| 277 HREF="thread.html" | |
| 278 >Up</A | |
| 279 ></TD | |
| 280 ><TD | |
| 281 WIDTH="33%" | |
| 282 ALIGN="right" | |
| 283 VALIGN="top" | |
| 284 >SDL_SemTryWait</TD | |
| 285 ></TR | |
| 286 ></TABLE | |
| 287 ></DIV | |
| 288 ></BODY | |
| 289 ></HTML | |
| 290 > |