Mercurial > sdl-ios-xcode
annotate docs/html/sdlcondbroadcast.html @ 765:4c2ba6161939
Editors Note: The original patch was modified to use SDL_Delay() instead of
nanosleep because nanosleep may not be portable to all systems
using SDL with the ALSA backend. This may be a moot point with
the switch to blocking writes anyway...
Date: Sat, 27 Dec 2003 21:47:36 +0100
From: Michel Daenzer
To: Debian Bug Tracking System
Subject: [SDL] Bug#225252: [PATCH] ALSA fixes
Package: libsdl1.2debian-all
Version: 1.2.6-2
Severity: normal
Tags: patch
For SDL 1.2.6, the ALSA backend was changed to call snd_pcm_open() with
SND_PCM_NONBLOCK. That's a good idea per se, however, it causes high CPU
usage, interrupted sound and stuttering in some games here. Taking a nanosleep
whenever snd_pcm_writei() returns -EAGAIN fixes this, but I think it's more
efficient to use blocking mode for the actual sound playback. Feedback from the
SDL and ALSA lists appreciated.
The patch also fixes the default ALSA device to be used.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 04 Jan 2004 15:40:50 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_CondBroadcast</TITLE | |
| 5 ><META | |
| 6 NAME="GENERATOR" | |
|
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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="Multi-threaded Programming" | |
| 14 HREF="thread.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_CondSignal" | |
| 17 HREF="sdlcondsignal.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_CondWait" | |
| 20 HREF="sdlcondwait.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 | |
| 31 WIDTH="100%" | |
| 32 BORDER="0" | |
| 33 CELLPADDING="0" | |
| 34 CELLSPACING="0" | |
| 35 ><TR | |
| 36 ><TH | |
| 37 COLSPAN="3" | |
| 38 ALIGN="center" | |
| 39 >SDL Library Documentation</TH | |
| 40 ></TR | |
| 41 ><TR | |
| 42 ><TD | |
| 43 WIDTH="10%" | |
| 44 ALIGN="left" | |
| 45 VALIGN="bottom" | |
| 46 ><A | |
| 47 HREF="sdlcondsignal.html" | |
| 48 >Prev</A | |
| 49 ></TD | |
| 50 ><TD | |
| 51 WIDTH="80%" | |
| 52 ALIGN="center" | |
| 53 VALIGN="bottom" | |
| 54 ></TD | |
| 55 ><TD | |
| 56 WIDTH="10%" | |
| 57 ALIGN="right" | |
| 58 VALIGN="bottom" | |
| 59 ><A | |
| 60 HREF="sdlcondwait.html" | |
| 61 >Next</A | |
| 62 ></TD | |
| 63 ></TR | |
| 64 ></TABLE | |
| 65 ><HR | |
| 66 ALIGN="LEFT" | |
| 67 WIDTH="100%"></DIV | |
| 68 ><H1 | |
| 69 ><A | |
| 70 NAME="SDLCONDBROADCAST" | |
| 71 >SDL_CondBroadcast</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
|
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76 NAME="AEN7949" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_CondBroadcast -- Restart all threads waiting on a condition variable</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
|
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84 NAME="AEN7952" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
|
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91 NAME="AEN7953" |
| 0 | 92 ></A |
| 93 ><P | |
| 94 ></P | |
| 95 ><PRE | |
| 96 CLASS="FUNCSYNOPSISINFO" | |
| 97 >#include "SDL.h" | |
| 98 #include "SDL_thread.h"</PRE | |
| 99 ><P | |
| 100 ><CODE | |
| 101 ><CODE | |
| 102 CLASS="FUNCDEF" | |
| 103 >int <B | |
| 104 CLASS="FSFUNC" | |
| 105 >SDL_CondBroadcast</B | |
| 106 ></CODE | |
| 107 >(SDL_cond *cond);</CODE | |
| 108 ></P | |
| 109 ><P | |
| 110 ></P | |
| 111 ></DIV | |
| 112 ></DIV | |
| 113 ><DIV | |
| 114 CLASS="REFSECT1" | |
| 115 ><A | |
|
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116 NAME="AEN7959" |
| 0 | 117 ></A |
| 118 ><H2 | |
| 119 >Description</H2 | |
| 120 ><P | |
| 121 >Restarts all threads that are waiting on the condition variable, <TT | |
| 122 CLASS="PARAMETER" | |
| 123 ><I | |
| 124 >cond</I | |
| 125 ></TT | |
| 126 >. Returns <SPAN | |
| 127 CLASS="RETURNVALUE" | |
| 128 >0</SPAN | |
| 129 > on success, or <SPAN | |
| 130 CLASS="RETURNVALUE" | |
| 131 >-1</SPAN | |
| 132 > on an error.</P | |
| 133 ></DIV | |
| 134 ><DIV | |
| 135 CLASS="REFSECT1" | |
| 136 ><A | |
|
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137 NAME="AEN7965" |
| 0 | 138 ></A |
| 139 ><H2 | |
| 140 >See Also</H2 | |
| 141 ><P | |
| 142 ><A | |
| 143 HREF="sdlcondsignal.html" | |
| 144 ><TT | |
| 145 CLASS="FUNCTION" | |
| 146 >SDL_CondSignal</TT | |
| 147 ></A | |
| 148 >, | |
| 149 <A | |
| 150 HREF="sdlcondwait.html" | |
| 151 ><TT | |
| 152 CLASS="FUNCTION" | |
| 153 >SDL_CondWait</TT | |
| 154 ></A | |
| 155 > </P | |
| 156 ></DIV | |
| 157 ><DIV | |
| 158 CLASS="NAVFOOTER" | |
| 159 ><HR | |
| 160 ALIGN="LEFT" | |
| 161 WIDTH="100%"><TABLE | |
| 162 WIDTH="100%" | |
| 163 BORDER="0" | |
| 164 CELLPADDING="0" | |
| 165 CELLSPACING="0" | |
| 166 ><TR | |
| 167 ><TD | |
| 168 WIDTH="33%" | |
| 169 ALIGN="left" | |
| 170 VALIGN="top" | |
| 171 ><A | |
| 172 HREF="sdlcondsignal.html" | |
| 173 >Prev</A | |
| 174 ></TD | |
| 175 ><TD | |
| 176 WIDTH="34%" | |
| 177 ALIGN="center" | |
| 178 VALIGN="top" | |
| 179 ><A | |
| 180 HREF="index.html" | |
| 181 >Home</A | |
| 182 ></TD | |
| 183 ><TD | |
| 184 WIDTH="33%" | |
| 185 ALIGN="right" | |
| 186 VALIGN="top" | |
| 187 ><A | |
| 188 HREF="sdlcondwait.html" | |
| 189 >Next</A | |
| 190 ></TD | |
| 191 ></TR | |
| 192 ><TR | |
| 193 ><TD | |
| 194 WIDTH="33%" | |
| 195 ALIGN="left" | |
| 196 VALIGN="top" | |
| 197 >SDL_CondSignal</TD | |
| 198 ><TD | |
| 199 WIDTH="34%" | |
| 200 ALIGN="center" | |
| 201 VALIGN="top" | |
| 202 ><A | |
| 203 HREF="thread.html" | |
| 204 >Up</A | |
| 205 ></TD | |
| 206 ><TD | |
| 207 WIDTH="33%" | |
| 208 ALIGN="right" | |
| 209 VALIGN="top" | |
| 210 >SDL_CondWait</TD | |
| 211 ></TR | |
| 212 ></TABLE | |
| 213 ></DIV | |
| 214 ></BODY | |
| 215 ></HTML | |
| 216 > |