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[karo-tx-redboot.git] / doc / html / ref / tcpip-openbsd-enhanced-select.html
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-<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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-<HTML
-><HEAD
-><TITLE
->Enhanced Select()</TITLE
-><meta name="MSSmartTagsPreventParsing" content="TRUE">
-<META
-NAME="GENERATOR"
-CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
-"><LINK
-REL="HOME"
-TITLE="eCos Reference Manual"
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-REL="PREVIOUS"
-TITLE="APIs"
-HREF="tcpip-openbsd-tcpip-apis.html"><LINK
-REL="NEXT"
-TITLE="DNS for eCos and RedBoot"
-HREF="net-ns-dns.html"></HEAD
-><BODY
-CLASS="SECT1"
-BGCOLOR="#FFFFFF"
-TEXT="#000000"
-LINK="#0000FF"
-VLINK="#840084"
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-><DIV
-CLASS="NAVHEADER"
-><TABLE
-SUMMARY="Header navigation table"
-WIDTH="100%"
-BORDER="0"
-CELLPADDING="0"
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-><TR
-><TH
-COLSPAN="3"
-ALIGN="center"
->eCos Reference Manual</TH
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-ACCESSKEY="P"
->Prev</A
-></TD
-><TD
-WIDTH="80%"
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->Chapter 44. APIs</TD
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-><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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-CLASS="NAVFOOTER"
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