Mercurial > sdl-ios-xcode
annotate docs/html/sdlquitevent.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_QuitEvent</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="SDL Event Structures." | |
| 14 HREF="eventstructures.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_UserEvent" | |
| 17 HREF="sdluserevent.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_keysym" | |
| 20 HREF="sdlkeysym.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="sdluserevent.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="sdlkeysym.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="SDLQUITEVENT" | |
| 71 >SDL_QuitEvent</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
|
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76 NAME="AEN4237" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_QuitEvent -- Quit requested event</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSECT1" | |
| 83 ><A | |
|
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84 NAME="AEN4240" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Structure Definition</H2 | |
| 88 ><PRE | |
| 89 CLASS="PROGRAMLISTING" | |
| 90 >typedef struct{ | |
| 91 Uint8 type | |
| 92 } SDL_QuitEvent;</PRE | |
| 93 ></DIV | |
| 94 ><DIV | |
| 95 CLASS="REFSECT1" | |
| 96 ><A | |
|
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97 NAME="AEN4243" |
| 0 | 98 ></A |
| 99 ><H2 | |
| 100 >Structure Data</H2 | |
| 101 ><DIV | |
| 102 CLASS="INFORMALTABLE" | |
| 103 ><A | |
|
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104 NAME="AEN4245" |
| 0 | 105 ></A |
| 106 ><P | |
| 107 ></P | |
| 108 ><TABLE | |
| 109 BORDER="0" | |
| 110 CLASS="CALSTABLE" | |
| 111 ><TBODY | |
| 112 ><TR | |
| 113 ><TD | |
| 114 ALIGN="LEFT" | |
| 115 VALIGN="TOP" | |
| 116 ><TT | |
| 117 CLASS="STRUCTFIELD" | |
| 118 ><I | |
| 119 >type</I | |
| 120 ></TT | |
| 121 ></TD | |
| 122 ><TD | |
| 123 ALIGN="LEFT" | |
| 124 VALIGN="TOP" | |
| 125 ><TT | |
| 126 CLASS="LITERAL" | |
| 127 >SDL_QUIT</TT | |
| 128 ></TD | |
| 129 ></TR | |
| 130 ></TBODY | |
| 131 ></TABLE | |
| 132 ><P | |
| 133 ></P | |
| 134 ></DIV | |
| 135 ></DIV | |
| 136 ><DIV | |
| 137 CLASS="REFSECT1" | |
| 138 ><A | |
|
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139 NAME="AEN4253" |
| 0 | 140 ></A |
| 141 ><H2 | |
| 142 >Description</H2 | |
| 143 ><P | |
| 144 ><SPAN | |
| 145 CLASS="STRUCTNAME" | |
| 146 >SDL_QuitEvent</SPAN | |
| 147 > is a member of the <A | |
| 148 HREF="sdlevent.html" | |
| 149 ><SPAN | |
| 150 CLASS="STRUCTNAME" | |
| 151 >SDL_Event</SPAN | |
| 152 ></A | |
| 153 > union and is used whan an event of type <TT | |
| 154 CLASS="LITERAL" | |
| 155 >SDL_QUIT</TT | |
| 156 > is reported.</P | |
| 157 ><P | |
| 158 >As can be seen, the SDL_QuitEvent structure serves no useful purpose. The event itself, on the other hand, is very important. If you filter out or ignore a quit event then it is impossible for the user to close the window. On the other hand, if you do accept a quit event then the application window will be closed, and screen updates will still report success event though the application will no longer be visible.</P | |
| 159 ><DIV | |
| 160 CLASS="NOTE" | |
| 161 ><BLOCKQUOTE | |
| 162 CLASS="NOTE" | |
| 163 ><P | |
| 164 ><B | |
| 165 >Note: </B | |
| 166 >The macro <TT | |
| 167 CLASS="FUNCTION" | |
| 168 >SDL_QuitRequested</TT | |
| 169 > will return non-zero if a quit event is pending</P | |
| 170 ></BLOCKQUOTE | |
| 171 ></DIV | |
| 172 ></DIV | |
| 173 ><DIV | |
| 174 CLASS="REFSECT1" | |
| 175 ><A | |
|
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176 NAME="AEN4264" |
| 0 | 177 ></A |
| 178 ><H2 | |
| 179 >See Also</H2 | |
| 180 ><P | |
| 181 ><A | |
| 182 HREF="sdlevent.html" | |
| 183 ><SPAN | |
| 184 CLASS="STRUCTNAME" | |
| 185 >SDL_Event</SPAN | |
| 186 ></A | |
| 187 >, | |
| 188 <A | |
| 189 HREF="sdlseteventfilter.html" | |
| 190 ><TT | |
| 191 CLASS="FUNCTION" | |
| 192 >SDL_SetEventFilter</TT | |
| 193 ></A | |
| 194 ></P | |
| 195 ></DIV | |
| 196 ><DIV | |
| 197 CLASS="NAVFOOTER" | |
| 198 ><HR | |
| 199 ALIGN="LEFT" | |
| 200 WIDTH="100%"><TABLE | |
| 201 WIDTH="100%" | |
| 202 BORDER="0" | |
| 203 CELLPADDING="0" | |
| 204 CELLSPACING="0" | |
| 205 ><TR | |
| 206 ><TD | |
| 207 WIDTH="33%" | |
| 208 ALIGN="left" | |
| 209 VALIGN="top" | |
| 210 ><A | |
| 211 HREF="sdluserevent.html" | |
| 212 >Prev</A | |
| 213 ></TD | |
| 214 ><TD | |
| 215 WIDTH="34%" | |
| 216 ALIGN="center" | |
| 217 VALIGN="top" | |
| 218 ><A | |
| 219 HREF="index.html" | |
| 220 >Home</A | |
| 221 ></TD | |
| 222 ><TD | |
| 223 WIDTH="33%" | |
| 224 ALIGN="right" | |
| 225 VALIGN="top" | |
| 226 ><A | |
| 227 HREF="sdlkeysym.html" | |
| 228 >Next</A | |
| 229 ></TD | |
| 230 ></TR | |
| 231 ><TR | |
| 232 ><TD | |
| 233 WIDTH="33%" | |
| 234 ALIGN="left" | |
| 235 VALIGN="top" | |
| 236 >SDL_UserEvent</TD | |
| 237 ><TD | |
| 238 WIDTH="34%" | |
| 239 ALIGN="center" | |
| 240 VALIGN="top" | |
| 241 ><A | |
| 242 HREF="eventstructures.html" | |
| 243 >Up</A | |
| 244 ></TD | |
| 245 ><TD | |
| 246 WIDTH="33%" | |
| 247 ALIGN="right" | |
| 248 VALIGN="top" | |
| 249 >SDL_keysym</TD | |
| 250 ></TR | |
| 251 ></TABLE | |
| 252 ></DIV | |
| 253 ></BODY | |
| 254 ></HTML | |
| 255 > |