Mercurial > sdl-ios-xcode
annotate docs/html/sdlsemwaittimeout.html @ 4106:12bb6311fd5d SDL-1.2
Hans de Goede fixed bug #495
When running boswars: http://www.boswars.org/ on a machine with intel
integrathed graphics it crashes when it tries to play the initial theora
splashscreen video:
X Error of failed request: BadAlloc (insufficient resources for operation)
Major opcode of failed request: 140 (XVideo)
Minor opcode of failed request: 19 ()
Serial number of failed request: 25
Current serial number in output stream: 26
boswars: xcb_xlib.c:41: xcb_xlib_lock: Assertion `!c->xlib.lock' failed.
Aborted
I recognized this problem from a few years back, when I encountered it while
working on the Xv blitter for xmame. The problem is that for some reason
creation the Xvport and XvImage succeeds, and failure (lack of resources / hw
capability?) is only indicated during the first XvPut[Shm]Image. I've written a
patch for SDL using the work around for this I developed for xmame (and which
is still used successfully in xmame after many years of usage).
I'll admit it isn't very pretty, but after investigating several possibilities
this was the best option, any other fixes would need changes to the SDL api and
abi.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 29 Dec 2007 02:23:48 +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 > |