Mercurial > sdl-ios-xcode
annotate docs/html/sdlcondwait.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_CondWait</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_CondBroadcast" | |
| 17 HREF="sdlcondbroadcast.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_CondWaitTimeout" | |
| 20 HREF="sdlcondwaittimeout.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="sdlcondbroadcast.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="sdlcondwaittimeout.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="SDLCONDWAIT" | |
| 71 >SDL_CondWait</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
|
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76 NAME="AEN7976" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_CondWait -- Wait on a condition variable</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
|
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84 NAME="AEN7979" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
|
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91 NAME="AEN7980" |
| 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_CondWait</B | |
| 106 ></CODE | |
| 107 >(SDL_cond *cond, SDL_mutex *mut);</CODE | |
| 108 ></P | |
| 109 ><P | |
| 110 ></P | |
| 111 ></DIV | |
| 112 ></DIV | |
| 113 ><DIV | |
| 114 CLASS="REFSECT1" | |
| 115 ><A | |
|
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116 NAME="AEN7986" |
| 0 | 117 ></A |
| 118 ><H2 | |
| 119 >Description</H2 | |
| 120 ><P | |
| 121 >Wait on the condition variable <TT | |
| 122 CLASS="PARAMETER" | |
| 123 ><I | |
| 124 >cond</I | |
| 125 ></TT | |
| 126 > and unlock the provided mutex. The mutex must the locked before entering this function. Returns <SPAN | |
| 127 CLASS="RETURNVALUE" | |
| 128 >0</SPAN | |
| 129 > when it is signalled, 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="AEN7992" |
| 0 | 138 ></A |
| 139 ><H2 | |
| 140 >See Also</H2 | |
| 141 ><P | |
| 142 ><A | |
| 143 HREF="sdlcondwaittimeout.html" | |
| 144 ><TT | |
| 145 CLASS="FUNCTION" | |
| 146 >SDL_CondWaitTimeout</TT | |
| 147 ></A | |
| 148 >, | |
| 149 <A | |
| 150 HREF="sdlcondsignal.html" | |
| 151 ><TT | |
| 152 CLASS="FUNCTION" | |
| 153 >SDL_CondSignal</TT | |
| 154 ></A | |
| 155 >, | |
| 156 <A | |
| 157 HREF="sdlmutexp.html" | |
| 158 ><TT | |
| 159 CLASS="FUNCTION" | |
| 160 >SDL_mutexP</TT | |
| 161 ></A | |
| 162 ></P | |
| 163 ></DIV | |
| 164 ><DIV | |
| 165 CLASS="NAVFOOTER" | |
| 166 ><HR | |
| 167 ALIGN="LEFT" | |
| 168 WIDTH="100%"><TABLE | |
| 169 WIDTH="100%" | |
| 170 BORDER="0" | |
| 171 CELLPADDING="0" | |
| 172 CELLSPACING="0" | |
| 173 ><TR | |
| 174 ><TD | |
| 175 WIDTH="33%" | |
| 176 ALIGN="left" | |
| 177 VALIGN="top" | |
| 178 ><A | |
| 179 HREF="sdlcondbroadcast.html" | |
| 180 >Prev</A | |
| 181 ></TD | |
| 182 ><TD | |
| 183 WIDTH="34%" | |
| 184 ALIGN="center" | |
| 185 VALIGN="top" | |
| 186 ><A | |
| 187 HREF="index.html" | |
| 188 >Home</A | |
| 189 ></TD | |
| 190 ><TD | |
| 191 WIDTH="33%" | |
| 192 ALIGN="right" | |
| 193 VALIGN="top" | |
| 194 ><A | |
| 195 HREF="sdlcondwaittimeout.html" | |
| 196 >Next</A | |
| 197 ></TD | |
| 198 ></TR | |
| 199 ><TR | |
| 200 ><TD | |
| 201 WIDTH="33%" | |
| 202 ALIGN="left" | |
| 203 VALIGN="top" | |
| 204 >SDL_CondBroadcast</TD | |
| 205 ><TD | |
| 206 WIDTH="34%" | |
| 207 ALIGN="center" | |
| 208 VALIGN="top" | |
| 209 ><A | |
| 210 HREF="thread.html" | |
| 211 >Up</A | |
| 212 ></TD | |
| 213 ><TD | |
| 214 WIDTH="33%" | |
| 215 ALIGN="right" | |
| 216 VALIGN="top" | |
| 217 >SDL_CondWaitTimeout</TD | |
| 218 ></TR | |
| 219 ></TABLE | |
| 220 ></DIV | |
| 221 ></BODY | |
| 222 ></HTML | |
| 223 > |