Mercurial > sdl-ios-xcode
annotate docs/html/sdlsemwait.html @ 883:50f5a29c6a17
Date: Sat, 10 Apr 2004 02:25:33 -0400
From: Glenn Maynard
To: sdl@libsdl.org
Subject: [SDL] SDL_SetVideoMode() failing and not setting an error (patch)
Running an OpenGL SDL application off 1.2.7, at SDL_InitSubSystem(SDL_INIT_VIDEO) time:
Warning: Unable to initialize AAlib mouseUsing AAlib driver: Slang driver 1.0 (slang)
SDL_SetVideoMode then fails; SDL_GetError() returns "".
The installation problem is straightforward: X (the higher priority
driver) isn't running, so SDL is falling back on aalib. However,
no error is being set when aalib fails to initialize. This also
happens with the svgalib driver.
SDL_video.c line ~653 sets mode to NULL, since aalib didn't return an
OpenGL surface. Line ~711 ("failed setting a video mode") returns NULL.
The attached patch sets an error. It's a horrible, useless error
message--it should really say eg. "aalib does not support OpenGL"; this
should probably be done earlier in the individual drivers, too.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 11 Apr 2004 19:54:40 +0000 |
| parents | 355632dca928 |
| children |
| rev | line source |
|---|---|
| 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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803
355632dca928
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parents:
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changeset
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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" | |
|
803
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parents:
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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" | |
|
803
355632dca928
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parents:
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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 > |