Mercurial > sdl-ios-xcode
annotate docs/html/thread.html @ 641:df178851293b
Date: 28 Jun 2003 22:42:52 +0100
From: Alan Swanson
Subject: Re: [SDL] New XFree 4.3 Video Mode Patch
I have a wee amendment that moves the qsort in set_best_resolution
to only occur after failing to find an exact match only. This would
make absolutely sure we get a user set mode.
While I've never had any problems for my normal resolutions (1280x1024,
1024x768, 800x600 & 640,480) while closely examining the output from
qsort I've noticed it doesn't seem to sort the modes fully. These is
one definite wrong at 1152x768 and a few that just look wrong to me.
From a program (attached) I made to examine this more easily. X has
sorted its mode list using the same method as ours (plus frequency),
and our user modes get inserted without any other movement.
On the patch I've made I've also changed cmpmodes to sort on vertical
resolution and then horizontal. Ie vertical is now most significant
bit.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 28 Jun 2003 21:52:26 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >Multi-threaded Programming</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="SDL Reference" | |
| 14 HREF="reference.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_CDtrack" | |
| 17 HREF="sdlcdtrack.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_CreateThread" | |
| 20 HREF="sdlcreatethread.html"><META | |
| 21 NAME="KEYWORD" | |
| 22 CONTENT="threads"><META | |
| 23 NAME="KEYWORD" | |
| 24 CONTENT="function"></HEAD | |
| 25 ><BODY | |
| 26 CLASS="CHAPTER" | |
| 27 BGCOLOR="#FFF8DC" | |
| 28 TEXT="#000000" | |
| 29 LINK="#0000ee" | |
| 30 VLINK="#551a8b" | |
| 31 ALINK="#ff0000" | |
| 32 ><DIV | |
| 33 CLASS="NAVHEADER" | |
| 34 ><TABLE | |
| 35 WIDTH="100%" | |
| 36 BORDER="0" | |
| 37 CELLPADDING="0" | |
| 38 CELLSPACING="0" | |
| 39 ><TR | |
| 40 ><TH | |
| 41 COLSPAN="3" | |
| 42 ALIGN="center" | |
| 43 >SDL Library Documentation</TH | |
| 44 ></TR | |
| 45 ><TR | |
| 46 ><TD | |
| 47 WIDTH="10%" | |
| 48 ALIGN="left" | |
| 49 VALIGN="bottom" | |
| 50 ><A | |
| 51 HREF="sdlcdtrack.html" | |
| 52 >Prev</A | |
| 53 ></TD | |
| 54 ><TD | |
| 55 WIDTH="80%" | |
| 56 ALIGN="center" | |
| 57 VALIGN="bottom" | |
| 58 ></TD | |
| 59 ><TD | |
| 60 WIDTH="10%" | |
| 61 ALIGN="right" | |
| 62 VALIGN="bottom" | |
| 63 ><A | |
| 64 HREF="sdlcreatethread.html" | |
| 65 >Next</A | |
| 66 ></TD | |
| 67 ></TR | |
| 68 ></TABLE | |
| 69 ><HR | |
| 70 ALIGN="LEFT" | |
| 71 WIDTH="100%"></DIV | |
| 72 ><DIV | |
| 73 CLASS="CHAPTER" | |
| 74 ><H1 | |
| 75 ><A | |
| 76 NAME="THREAD" | |
| 77 >Chapter 12. Multi-threaded Programming</A | |
| 78 ></H1 | |
| 79 ><DIV | |
| 80 CLASS="TOC" | |
| 81 ><DL | |
| 82 ><DT | |
| 83 ><B | |
| 84 >Table of Contents</B | |
| 85 ></DT | |
| 86 ><DT | |
| 87 ><A | |
| 88 HREF="sdlcreatethread.html" | |
| 89 >SDL_CreateThread</A | |
| 90 > — Creates a new thread of execution that shares its parent's properties.</DT | |
| 91 ><DT | |
| 92 ><A | |
| 93 HREF="sdlthreadid.html" | |
| 94 >SDL_ThreadID</A | |
| 95 > — Get the 32-bit thread identifier for the current thread.</DT | |
| 96 ><DT | |
| 97 ><A | |
| 98 HREF="sdlgetthreadid.html" | |
| 99 >SDL_GetThreadID</A | |
| 100 > — Get the SDL thread ID of a SDL_Thread</DT | |
| 101 ><DT | |
| 102 ><A | |
| 103 HREF="sdlwaitthread.html" | |
| 104 >SDL_WaitThread</A | |
| 105 > — Wait for a thread to finish.</DT | |
| 106 ><DT | |
| 107 ><A | |
| 108 HREF="sdlkillthread.html" | |
| 109 >SDL_KillThread</A | |
| 110 > — Gracelessly terminates the thread.</DT | |
| 111 ><DT | |
| 112 ><A | |
| 113 HREF="sdlcreatemutex.html" | |
| 114 >SDL_CreateMutex</A | |
| 115 > — Create a mutex</DT | |
| 116 ><DT | |
| 117 ><A | |
| 118 HREF="sdldestroymutex.html" | |
| 119 >SDL_DestroyMutex</A | |
| 120 > — Destroy a mutex</DT | |
| 121 ><DT | |
| 122 ><A | |
| 123 HREF="sdlmutexp.html" | |
| 124 >SDL_mutexP</A | |
| 125 > — Lock a mutex</DT | |
| 126 ><DT | |
| 127 ><A | |
| 128 HREF="sdlmutexv.html" | |
| 129 >SDL_mutexV</A | |
| 130 > — Unlock a mutex</DT | |
| 131 ><DT | |
| 132 ><A | |
| 133 HREF="sdlcreatesemaphore.html" | |
| 134 >SDL_CreateSemaphore</A | |
| 135 > — Creates a new semaphore and assigns an initial value to it.</DT | |
| 136 ><DT | |
| 137 ><A | |
| 138 HREF="sdldestroysemaphore.html" | |
| 139 >SDL_DestroySemaphore</A | |
| 140 > — Destroys a semaphore that was created by <A | |
| 141 HREF="sdlcreatesemaphore.html" | |
| 142 >SDL_CreateSemaphore</A | |
| 143 >.</DT | |
| 144 ><DT | |
| 145 ><A | |
| 146 HREF="sdlsemwait.html" | |
| 147 >SDL_SemWait</A | |
| 148 > — Lock a semaphore and suspend the thread if the semaphore value is zero.</DT | |
| 149 ><DT | |
| 150 ><A | |
| 151 HREF="sdlsemtrywait.html" | |
| 152 >SDL_SemTryWait</A | |
| 153 > — Attempt to lock a semaphore but don't suspend the thread.</DT | |
| 154 ><DT | |
| 155 ><A | |
| 156 HREF="sdlsemwaittimeout.html" | |
| 157 >SDL_SemWaitTimeout</A | |
| 158 > — Lock a semaphore, but only wait up to a specified maximum time.</DT | |
| 159 ><DT | |
| 160 ><A | |
| 161 HREF="sdlsempost.html" | |
| 162 >SDL_SemPost</A | |
| 163 > — Unlock a semaphore.</DT | |
| 164 ><DT | |
| 165 ><A | |
| 166 HREF="sdlsemvalue.html" | |
| 167 >SDL_SemValue</A | |
| 168 > — Return the current value of a semaphore.</DT | |
| 169 ><DT | |
| 170 ><A | |
| 171 HREF="sdlcreatecond.html" | |
| 172 >SDL_CreateCond</A | |
| 173 > — Create a condition variable</DT | |
| 174 ><DT | |
| 175 ><A | |
| 176 HREF="sdldestroycond.html" | |
| 177 >SDL_DestroyCond</A | |
| 178 > — Destroy a condition variable</DT | |
| 179 ><DT | |
| 180 ><A | |
| 181 HREF="sdlcondsignal.html" | |
| 182 >SDL_CondSignal</A | |
| 183 > — Restart a thread wait on a condition variable</DT | |
| 184 ><DT | |
| 185 ><A | |
| 186 HREF="sdlcondbroadcast.html" | |
| 187 >SDL_CondBroadcast</A | |
| 188 > — Restart all threads waiting on a condition variable</DT | |
| 189 ><DT | |
| 190 ><A | |
| 191 HREF="sdlcondwait.html" | |
| 192 >SDL_CondWait</A | |
| 193 > — Wait on a condition variable</DT | |
| 194 ><DT | |
| 195 ><A | |
| 196 HREF="sdlcondwaittimeout.html" | |
| 197 >SDL_CondWaitTimeout</A | |
| 198 > — Wait on a condition variable, with timeout</DT | |
| 199 ></DL | |
| 200 ></DIV | |
| 201 ><P | |
| 202 >SDL provides functions for creating threads, mutexes, semphores and condition variables.</P | |
| 203 ><P | |
| 204 >In general, you must be very aware of concurrency and data integrity issues | |
| 205 when writing multi-threaded programs. Some good guidelines include: | |
| 206 <P | |
| 207 ></P | |
| 208 ><UL | |
| 209 ><LI | |
| 210 ><P | |
| 211 >Don't call SDL video/event functions from separate threads</P | |
| 212 ></LI | |
| 213 ><LI | |
| 214 ><P | |
| 215 >Don't use any library functions in separate threads</P | |
| 216 ></LI | |
| 217 ><LI | |
| 218 ><P | |
| 219 >Don't perform any memory management in separate threads</P | |
| 220 ></LI | |
| 221 ><LI | |
| 222 ><P | |
| 223 >Lock global variables which may be accessed by multiple threads</P | |
| 224 ></LI | |
| 225 ><LI | |
| 226 ><P | |
| 227 >Never terminate threads, always set a flag and wait for them to quit</P | |
| 228 ></LI | |
| 229 ><LI | |
| 230 ><P | |
| 231 >Think very carefully about all possible ways your code may interact</P | |
| 232 ></LI | |
| 233 ></UL | |
| 234 ></P | |
| 235 ><DIV | |
| 236 CLASS="NOTE" | |
| 237 ><BLOCKQUOTE | |
| 238 CLASS="NOTE" | |
| 239 ><P | |
| 240 ><B | |
| 241 >Note: </B | |
|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
|
242 >SDL's threading is not implemented on MacOS, due to that lack of preemptive thread support (MacOS X dos nt suffer from this problem)</P |
| 0 | 243 ></BLOCKQUOTE |
| 244 ></DIV | |
| 245 ></DIV | |
| 246 ><DIV | |
| 247 CLASS="NAVFOOTER" | |
| 248 ><HR | |
| 249 ALIGN="LEFT" | |
| 250 WIDTH="100%"><TABLE | |
| 251 WIDTH="100%" | |
| 252 BORDER="0" | |
| 253 CELLPADDING="0" | |
| 254 CELLSPACING="0" | |
| 255 ><TR | |
| 256 ><TD | |
| 257 WIDTH="33%" | |
| 258 ALIGN="left" | |
| 259 VALIGN="top" | |
| 260 ><A | |
| 261 HREF="sdlcdtrack.html" | |
| 262 >Prev</A | |
| 263 ></TD | |
| 264 ><TD | |
| 265 WIDTH="34%" | |
| 266 ALIGN="center" | |
| 267 VALIGN="top" | |
| 268 ><A | |
| 269 HREF="index.html" | |
| 270 >Home</A | |
| 271 ></TD | |
| 272 ><TD | |
| 273 WIDTH="33%" | |
| 274 ALIGN="right" | |
| 275 VALIGN="top" | |
| 276 ><A | |
| 277 HREF="sdlcreatethread.html" | |
| 278 >Next</A | |
| 279 ></TD | |
| 280 ></TR | |
| 281 ><TR | |
| 282 ><TD | |
| 283 WIDTH="33%" | |
| 284 ALIGN="left" | |
| 285 VALIGN="top" | |
| 286 >SDL_CDtrack</TD | |
| 287 ><TD | |
| 288 WIDTH="34%" | |
| 289 ALIGN="center" | |
| 290 VALIGN="top" | |
| 291 ><A | |
| 292 HREF="reference.html" | |
| 293 >Up</A | |
| 294 ></TD | |
| 295 ><TD | |
| 296 WIDTH="33%" | |
| 297 ALIGN="right" | |
| 298 VALIGN="top" | |
| 299 >SDL_CreateThread</TD | |
| 300 ></TR | |
| 301 ></TABLE | |
| 302 ></DIV | |
| 303 ></BODY | |
| 304 ></HTML | |
| 305 > |