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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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<!-- and conditions set forth in the Open Publication License, v1.0  -->
<!-- or later (the latest version is presently available at          -->
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<!-- Distribution of the work or derivative of the work in any       -->
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<HTML
><HEAD
><TITLE
>Enhanced Select()</TITLE
><meta name="MSSmartTagsPreventParsing" content="TRUE">
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CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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HREF="ecos-ref.html"><LINK
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TITLE="APIs"
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><A
HREF="tcpip-openbsd-tcpip-apis.html"
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>Prev</A
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WIDTH="80%"
ALIGN="center"
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>Chapter 44. APIs</TD
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ACCESSKEY="N"
>Next</A
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><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="TCPIP-OPENBSD-ENHANCED-SELECT">Enhanced Select()</H1
><P
>The network stack supports an extension to the standard select
semantics which allows all threads that are waiting to be restarted
even if the select conditions are not satisfied.</P
><P
>The standard select() API:  </P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>int
<TT
CLASS="FUNCTION"
>select</TT
>(int nfd,
       fd_set &#0042;in, fd_set &#0042;out, fd_set &#0042;ex,
       struct timeval &#0042;tv); </PRE
></TD
></TR
></TABLE
><P
>does not support the restart.</P
><P
>The additional API:  </P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>int
<TT
CLASS="FUNCTION"
>cyg_select_with_abort</TT
>(int nfd,
       fd_set &#0042;in, fd_set &#0042;out, fd_set &#0042;ex,
       struct timeval &#0042;tv)</PRE
></TD
></TR
></TABLE
><P
>behaves exactly as select() with the additional feature that
a call to</P
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void <TT
CLASS="FUNCTION"
>cyg_select_abort</TT
>(void)</PRE
></TD
></TR
></TABLE
><P
>will cause all threads waiting in any
<TT
CLASS="FUNCTION"
>cyg_select_with_abort()</TT
> call
to cease waiting and continue execution.</P
></DIV
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ACCESSKEY="P"
>Prev</A
></TD
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>Home</A
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ACCESSKEY="U"
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>

Line No.	Rev	Author	Line
1	28	unneback	`<!-- Copyright (C) 2003 Red Hat, Inc. -->`
2			`<!-- This material may be distributed only subject to the terms -->`
3			`<!-- and conditions set forth in the Open Publication License, v1.0 -->`
4			`<!-- or later (the latest version is presently available at -->`
5			`<!-- http://www.opencontent.org/openpub/). -->`
6			`<!-- Distribution of the work or derivative of the work in any -->`
7			`<!-- standard (paper) book form is prohibited unless prior -->`
8			`<!-- permission is obtained from the copyright holder. -->`
9			`<HTML`
10			`><HEAD`
11			`><TITLE`
12			`>Enhanced Select()</TITLE`
13			`><meta name="MSSmartTagsPreventParsing" content="TRUE">`
14			`<META`
15			`NAME="GENERATOR"`
16			`CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+`
17			`"><LINK`
18			`REL="HOME"`
19			`TITLE="eCos Reference Manual"`
20			`HREF="ecos-ref.html"><LINK`
21			`REL="UP"`
22			`TITLE="APIs"`
23			`HREF="tcpip-openbsd-tcpip-apis.html"><LINK`
24			`REL="PREVIOUS"`
25			`TITLE="APIs"`
26			`HREF="tcpip-openbsd-tcpip-apis.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="DNS for eCos and RedBoot"`
29			`HREF="net-ns-dns.html"></HEAD`
30			`><BODY`
31			`CLASS="SECT1"`
32			`BGCOLOR="#FFFFFF"`
33			`TEXT="#000000"`
34			`LINK="#0000FF"`
35			`VLINK="#840084"`
36			`ALINK="#0000FF"`
37			`><DIV`
38			`CLASS="NAVHEADER"`
39			`><TABLE`
40			`SUMMARY="Header navigation table"`
41			`WIDTH="100%"`
42			`BORDER="0"`
43			`CELLPADDING="0"`
44			`CELLSPACING="0"`
45			`><TR`
46			`><TH`
47			`COLSPAN="3"`
48			`ALIGN="center"`
49			`>eCos Reference Manual</TH`
50			`></TR`
51			`><TR`
52			`><TD`
53			`WIDTH="10%"`
54			`ALIGN="left"`
55			`VALIGN="bottom"`
56			`><A`
57			`HREF="tcpip-openbsd-tcpip-apis.html"`
58			`ACCESSKEY="P"`
59			`>Prev</A`
60			`></TD`
61			`><TD`
62			`WIDTH="80%"`
63			`ALIGN="center"`
64			`VALIGN="bottom"`
65			`>Chapter 44. APIs</TD`
66			`><TD`
67			`WIDTH="10%"`
68			`ALIGN="right"`
69			`VALIGN="bottom"`
70			`><A`
71			`HREF="net-ns-dns.html"`
72			`ACCESSKEY="N"`
73			`>Next</A`
74			`></TD`
75			`></TR`
76			`></TABLE`
77			`><HR`
78			`ALIGN="LEFT"`
79			`WIDTH="100%"></DIV`
80			`><DIV`
81			`CLASS="SECT1"`
82			`><H1`
83			`CLASS="SECT1"`
84			`><A`
85			`NAME="TCPIP-OPENBSD-ENHANCED-SELECT">Enhanced Select()</H1`
86			`><P`
87			`>The network stack supports an extension to the standard select`
88			`semantics which allows all threads that are waiting to be restarted`
89			`even if the select conditions are not satisfied.</P`
90			`><P`
91			`>The standard select() API: </P`
92			`><TABLE`
93			`BORDER="5"`
94			`BGCOLOR="#E0E0F0"`
95			`WIDTH="70%"`
96			`><TR`
97			`><TD`
98			`><PRE`
99			`CLASS="PROGRAMLISTING"`
100			`>int`
101			`<TT`
102			`CLASS="FUNCTION"`
103			`>select</TT`
104			`>(int nfd,`
105			`fd_set in, fd_set out, fd_set *ex,`
106			`struct timeval *tv); </PRE`
107			`></TD`
108			`></TR`
109			`></TABLE`
110			`><P`
111			`>does not support the restart.</P`
112			`><P`
113			`>The additional API: </P`
114			`><TABLE`
115			`BORDER="5"`
116			`BGCOLOR="#E0E0F0"`
117			`WIDTH="70%"`
118			`><TR`
119			`><TD`
120			`><PRE`
121			`CLASS="PROGRAMLISTING"`
122			`>int`
123			`<TT`
124			`CLASS="FUNCTION"`
125			`>cyg_select_with_abort</TT`
126			`>(int nfd,`
127			`fd_set in, fd_set out, fd_set *ex,`
128			`struct timeval *tv)</PRE`
129			`></TD`
130			`></TR`
131			`></TABLE`
132			`><P`
133			`>behaves exactly as select() with the additional feature that`
134			`a call to</P`
135			`><TABLE`
136			`BORDER="5"`
137			`BGCOLOR="#E0E0F0"`
138			`WIDTH="70%"`
139			`><TR`
140			`><TD`
141			`><PRE`
142			`CLASS="PROGRAMLISTING"`
143			`>void <TT`
144			`CLASS="FUNCTION"`
145			`>cyg_select_abort</TT`
146			`>(void)</PRE`
147			`></TD`
148			`></TR`
149			`></TABLE`
150			`><P`
151			`>will cause all threads waiting in any`
152			`<TT`
153			`CLASS="FUNCTION"`
154			`>cyg_select_with_abort()</TT`
155			`> call`
156			`to cease waiting and continue execution.</P`
157			`></DIV`
158			`><DIV`
159			`CLASS="NAVFOOTER"`
160			`><HR`
161			`ALIGN="LEFT"`
162			`WIDTH="100%"><TABLE`
163			`SUMMARY="Footer navigation table"`
164			`WIDTH="100%"`
165			`BORDER="0"`
166			`CELLPADDING="0"`
167			`CELLSPACING="0"`
168			`><TR`
169			`><TD`
170			`WIDTH="33%"`
171			`ALIGN="left"`
172			`VALIGN="top"`
173			`><A`
174			`HREF="tcpip-openbsd-tcpip-apis.html"`
175			`ACCESSKEY="P"`
176			`>Prev</A`
177			`></TD`
178			`><TD`
179			`WIDTH="34%"`
180			`ALIGN="center"`
181			`VALIGN="top"`
182			`><A`
183			`HREF="ecos-ref.html"`
184			`ACCESSKEY="H"`
185			`>Home</A`
186			`></TD`
187			`><TD`
188			`WIDTH="33%"`
189			`ALIGN="right"`
190			`VALIGN="top"`
191			`><A`
192			`HREF="net-ns-dns.html"`
193			`ACCESSKEY="N"`
194			`>Next</A`
195			`></TD`
196			`></TR`
197			`><TR`
198			`><TD`
199			`WIDTH="33%"`
200			`ALIGN="left"`
201			`VALIGN="top"`
202			`>APIs</TD`
203			`><TD`
204			`WIDTH="34%"`
205			`ALIGN="center"`
206			`VALIGN="top"`
207			`><A`
208			`HREF="tcpip-openbsd-tcpip-apis.html"`
209			`ACCESSKEY="U"`
210			`>Up</A`
211			`></TD`
212			`><TD`
213			`WIDTH="33%"`
214			`ALIGN="right"`
215			`VALIGN="top"`
216			`>DNS for eCos and RedBoot</TD`
217			`></TR`
218			`></TABLE`
219			`></DIV`
220			`></BODY`
221			`></HTML`
222			`>`

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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [doc/] [html/] [ref/] [tcpip-openbsd-enhanced-select.html] - Blame information for rev 858