Mercurial > sdl-ios-xcode
annotate docs/html/sdlsemwaittimeout.html @ 1734:f7c667ded87d SDL-1.3
The general code handles restoring video mode/gamma/etc. when the window loses focus.
Support for changing fullscreen/windowed mode in progress.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 09 Jul 2006 18:09:16 +0000 |
| parents | 355632dca928 |
| children |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_SemWaitTimeout</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_SemTryWait" | |
| 17 HREF="sdlsemtrywait.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_SemPost" | |
| 20 HREF="sdlsempost.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="sdlsemtrywait.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="sdlsempost.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="SDLSEMWAITTIMEOUT" | |
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74 ></A |
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75 >SDL_SemWaitTimeout</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN8120" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_SemWaitTimeout -- Lock a semaphore, but only wait up to a specified maximum time.</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN8123" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN8124" |
| 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_SemWaitTimeout</B | |
| 109 ></CODE | |
| 110 >(SDL_sem *sem, Uint32 timeout);</CODE | |
| 111 ></P | |
| 112 ><P | |
| 113 ></P | |
| 114 ></DIV | |
| 115 ></DIV | |
| 116 ><DIV | |
| 117 CLASS="REFSECT1" | |
| 118 ><A | |
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119 NAME="AEN8130" |
| 0 | 120 ></A |
| 121 ><H2 | |
| 122 >Description</H2 | |
| 123 ><P | |
| 124 ><TT | |
| 125 CLASS="FUNCTION" | |
| 126 >SDL_SemWaitTimeout()</TT | |
| 127 > is a varient of | |
| 128 <A | |
| 129 HREF="sdlsemwait.html" | |
| 130 >SDL_SemWait</A | |
| 131 > | |
| 132 with a maximum timeout value. | |
| 133 If the value of the semaphore pointed to by <TT | |
| 134 CLASS="PARAMETER" | |
| 135 ><I | |
| 136 >sem</I | |
| 137 ></TT | |
| 138 > is | |
| 139 positive (greater than zero) it will atomically decrement the semaphore value | |
| 140 and return 0, otherwise it will wait up to <TT | |
| 141 CLASS="PARAMETER" | |
| 142 ><I | |
| 143 >timeout</I | |
| 144 ></TT | |
| 145 > | |
| 146 milliseconds trying to lock the semaphore. This function is to be avoided if | |
| 147 possible since on some platforms it is implemented by polling the semaphore | |
| 148 every millisecond in a busy loop.</P | |
| 149 ><P | |
| 150 >After <TT | |
| 151 CLASS="FUNCTION" | |
| 152 >SDL_SemWaitTimeout()</TT | |
| 153 > is successful, the semaphore | |
| 154 can be released and its count atomically incremented by a successful call to | |
| 155 <A | |
| 156 HREF="sdlsempost.html" | |
| 157 >SDL_SemPost</A | |
| 158 >.</P | |
| 159 ></DIV | |
| 160 ><DIV | |
| 161 CLASS="REFSECT1" | |
| 162 ><A | |
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163 NAME="AEN8140" |
| 0 | 164 ></A |
| 165 ><H2 | |
| 166 >Return Value</H2 | |
| 167 ><P | |
| 168 >Returns <SPAN | |
| 169 CLASS="RETURNVALUE" | |
| 170 >0</SPAN | |
| 171 > if the semaphore was successfully locked or | |
| 172 either <SPAN | |
| 173 CLASS="RETURNVALUE" | |
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174 >SDL_MUTEX_TIMEDOUT</SPAN |
| 0 | 175 > or <SPAN |
| 176 CLASS="RETURNVALUE" | |
| 177 >-1</SPAN | |
| 178 > | |
| 179 if the timeout period was exceeded or there was an error, respectivly.</P | |
| 180 ><P | |
| 181 >If the semaphore was not successfully locked, the semaphore will be unchanged.</P | |
| 182 ></DIV | |
| 183 ><DIV | |
| 184 CLASS="REFSECT1" | |
| 185 ><A | |
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186 NAME="AEN8147" |
| 0 | 187 ></A |
| 188 ><H2 | |
| 189 >Examples</H2 | |
| 190 ><P | |
| 191 ><PRE | |
| 192 CLASS="PROGRAMLISTING" | |
| 193 >res = SDL_SemWaitTimeout(my_sem, WAIT_TIMEOUT_MILLISEC); | |
| 194 | |
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195 if (res == SDL_MUTEX_TIMEDOUT) { |
| 0 | 196 return TRY_AGAIN; |
| 197 } | |
| 198 if (res == -1) { | |
| 199 return WAIT_ERROR; | |
| 200 } | |
| 201 | |
| 202 ... | |
| 203 | |
| 204 SDL_SemPost(my_sem);</PRE | |
| 205 ></P | |
| 206 ></DIV | |
| 207 ><DIV | |
| 208 CLASS="REFSECT1" | |
| 209 ><A | |
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210 NAME="AEN8151" |
| 0 | 211 ></A |
| 212 ><H2 | |
| 213 >See Also</H2 | |
| 214 ><P | |
| 215 ><A | |
| 216 HREF="sdlcreatesemaphore.html" | |
| 217 ><TT | |
| 218 CLASS="FUNCTION" | |
| 219 >SDL_CreateSemaphore</TT | |
| 220 ></A | |
| 221 >, | |
| 222 <A | |
| 223 HREF="sdldestroysemaphore.html" | |
| 224 ><TT | |
| 225 CLASS="FUNCTION" | |
| 226 >SDL_DestroySemaphore</TT | |
| 227 ></A | |
| 228 >, | |
| 229 <A | |
| 230 HREF="sdlsemwait.html" | |
| 231 ><TT | |
| 232 CLASS="FUNCTION" | |
| 233 >SDL_SemWait</TT | |
| 234 ></A | |
| 235 >, | |
| 236 <A | |
| 237 HREF="sdlsemtrywait.html" | |
| 238 ><TT | |
| 239 CLASS="FUNCTION" | |
| 240 >SDL_SemTryWait</TT | |
| 241 ></A | |
| 242 >, | |
| 243 <A | |
| 244 HREF="sdlsempost.html" | |
| 245 ><TT | |
| 246 CLASS="FUNCTION" | |
| 247 >SDL_SemPost</TT | |
| 248 ></A | |
| 249 >, | |
| 250 <A | |
| 251 HREF="sdlsemvalue.html" | |
| 252 ><TT | |
| 253 CLASS="FUNCTION" | |
| 254 >SDL_SemValue</TT | |
| 255 ></A | |
| 256 ></P | |
| 257 ></DIV | |
| 258 ><DIV | |
| 259 CLASS="NAVFOOTER" | |
| 260 ><HR | |
| 261 ALIGN="LEFT" | |
| 262 WIDTH="100%"><TABLE | |
|
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263 SUMMARY="Footer navigation table" |
| 0 | 264 WIDTH="100%" |
| 265 BORDER="0" | |
| 266 CELLPADDING="0" | |
| 267 CELLSPACING="0" | |
| 268 ><TR | |
| 269 ><TD | |
| 270 WIDTH="33%" | |
| 271 ALIGN="left" | |
| 272 VALIGN="top" | |
| 273 ><A | |
| 274 HREF="sdlsemtrywait.html" | |
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275 ACCESSKEY="P" |
| 0 | 276 >Prev</A |
| 277 ></TD | |
| 278 ><TD | |
| 279 WIDTH="34%" | |
| 280 ALIGN="center" | |
| 281 VALIGN="top" | |
| 282 ><A | |
| 283 HREF="index.html" | |
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284 ACCESSKEY="H" |
| 0 | 285 >Home</A |
| 286 ></TD | |
| 287 ><TD | |
| 288 WIDTH="33%" | |
| 289 ALIGN="right" | |
| 290 VALIGN="top" | |
| 291 ><A | |
| 292 HREF="sdlsempost.html" | |
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293 ACCESSKEY="N" |
| 0 | 294 >Next</A |
| 295 ></TD | |
| 296 ></TR | |
| 297 ><TR | |
| 298 ><TD | |
| 299 WIDTH="33%" | |
| 300 ALIGN="left" | |
| 301 VALIGN="top" | |
| 302 >SDL_SemTryWait</TD | |
| 303 ><TD | |
| 304 WIDTH="34%" | |
| 305 ALIGN="center" | |
| 306 VALIGN="top" | |
| 307 ><A | |
| 308 HREF="thread.html" | |
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309 ACCESSKEY="U" |
| 0 | 310 >Up</A |
| 311 ></TD | |
| 312 ><TD | |
| 313 WIDTH="33%" | |
| 314 ALIGN="right" | |
| 315 VALIGN="top" | |
| 316 >SDL_SemPost</TD | |
| 317 ></TR | |
| 318 ></TABLE | |
| 319 ></DIV | |
| 320 ></BODY | |
| 321 ></HTML | |
| 322 > |