Mercurial > sdl-ios-xcode
annotate docs/html/sdllockaudio.html @ 1157:baf35853ad54
Date: Mon, 10 Oct 2005 13:09:32 +0300
From: Tommi Kyntola <tommi.kyntola@ray.fi>
To: sdl@libsdl.org
Subject: [SDL] [RFC] get_ticks broken on linux
It uses gettimeofday to calculate the timedifference.
Gettimeofday returns current time which is seldom monotonous.
This breaks SDL timer subsystem. (time callbacks and all that
get borked when the time difference ms is suddenly ~ 2^32)
I posted a message about this earlier but got no response.
Some thoughts on this matter would be appreciated.
(Or even an explanation for the lack of interest.)
A patch below would use the posix timers that have been around
since posix 93 and do provide a good source of monotonous time
on linux boxes (and on few others too).
The following patch is also availabe at:
http://www.hut.fi/u/tkyntola/SDL-1.2.9-clockfix.patch
It's against 1.2.9, but I can easily rediffit against
the cvs branch is needed.
cheers,
Tommi Kyntola tommi.kyntola@ray.fi
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Tue, 11 Oct 2005 18:16:12 +0000 |
| parents | 355632dca928 |
| children |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_LockAudio</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="Audio" | |
| 14 HREF="audio.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_MixAudio" | |
| 17 HREF="sdlmixaudio.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_UnlockAudio" | |
| 20 HREF="sdlunlockaudio.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="sdlmixaudio.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="sdlunlockaudio.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="SDLLOCKAUDIO" | |
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74 ></A |
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75 >SDL_LockAudio</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN7134" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_LockAudio -- Lock out the callback function</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN7137" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN7138" |
| 0 | 95 ></A |
| 96 ><P | |
| 97 ></P | |
| 98 ><PRE | |
| 99 CLASS="FUNCSYNOPSISINFO" | |
| 100 >#include "SDL.h"</PRE | |
| 101 ><P | |
| 102 ><CODE | |
| 103 ><CODE | |
| 104 CLASS="FUNCDEF" | |
| 105 >void <B | |
| 106 CLASS="FSFUNC" | |
| 107 >SDL_LockAudio</B | |
| 108 ></CODE | |
| 109 >(void);</CODE | |
| 110 ></P | |
| 111 ><P | |
| 112 ></P | |
| 113 ></DIV | |
| 114 ></DIV | |
| 115 ><DIV | |
| 116 CLASS="REFSECT1" | |
| 117 ><A | |
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118 NAME="AEN7144" |
| 0 | 119 ></A |
| 120 ><H2 | |
| 121 >Description</H2 | |
| 122 ><P | |
| 123 >The lock manipulated by these functions protects the callback function. | |
| 124 During a LockAudio period, you can be guaranteed that the | |
| 125 callback function is not running. Do not call these from the callback | |
| 126 function or you will cause deadlock.</P | |
| 127 ></DIV | |
| 128 ><DIV | |
| 129 CLASS="REFSECT1" | |
| 130 ><A | |
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131 NAME="AEN7147" |
| 0 | 132 ></A |
| 133 ><H2 | |
| 134 >See Also</H2 | |
| 135 ><P | |
| 136 ><A | |
| 137 HREF="sdlopenaudio.html" | |
| 138 ><TT | |
| 139 CLASS="FUNCTION" | |
| 140 >SDL_OpenAudio</TT | |
| 141 ></A | |
| 142 ></P | |
| 143 ></DIV | |
| 144 ><DIV | |
| 145 CLASS="NAVFOOTER" | |
| 146 ><HR | |
| 147 ALIGN="LEFT" | |
| 148 WIDTH="100%"><TABLE | |
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149 SUMMARY="Footer navigation table" |
| 0 | 150 WIDTH="100%" |
| 151 BORDER="0" | |
| 152 CELLPADDING="0" | |
| 153 CELLSPACING="0" | |
| 154 ><TR | |
| 155 ><TD | |
| 156 WIDTH="33%" | |
| 157 ALIGN="left" | |
| 158 VALIGN="top" | |
| 159 ><A | |
| 160 HREF="sdlmixaudio.html" | |
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161 ACCESSKEY="P" |
| 0 | 162 >Prev</A |
| 163 ></TD | |
| 164 ><TD | |
| 165 WIDTH="34%" | |
| 166 ALIGN="center" | |
| 167 VALIGN="top" | |
| 168 ><A | |
| 169 HREF="index.html" | |
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170 ACCESSKEY="H" |
| 0 | 171 >Home</A |
| 172 ></TD | |
| 173 ><TD | |
| 174 WIDTH="33%" | |
| 175 ALIGN="right" | |
| 176 VALIGN="top" | |
| 177 ><A | |
| 178 HREF="sdlunlockaudio.html" | |
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179 ACCESSKEY="N" |
| 0 | 180 >Next</A |
| 181 ></TD | |
| 182 ></TR | |
| 183 ><TR | |
| 184 ><TD | |
| 185 WIDTH="33%" | |
| 186 ALIGN="left" | |
| 187 VALIGN="top" | |
| 188 >SDL_MixAudio</TD | |
| 189 ><TD | |
| 190 WIDTH="34%" | |
| 191 ALIGN="center" | |
| 192 VALIGN="top" | |
| 193 ><A | |
| 194 HREF="audio.html" | |
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195 ACCESSKEY="U" |
| 0 | 196 >Up</A |
| 197 ></TD | |
| 198 ><TD | |
| 199 WIDTH="33%" | |
| 200 ALIGN="right" | |
| 201 VALIGN="top" | |
| 202 >SDL_UnlockAudio</TD | |
| 203 ></TR | |
| 204 ></TABLE | |
| 205 ></DIV | |
| 206 ></BODY | |
| 207 ></HTML | |
| 208 > |