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<!-- Copyright (C) 2003 Red Hat, Inc. --> <!-- This material may be distributed only subject to the terms --> <!-- and conditions set forth in the Open Publication License, v1.0 --> <!-- or later (the latest version is presently available at --> <!-- http://www.opencontent.org/openpub/). --> <!-- Distribution of the work or derivative of the work in any --> <!-- standard (paper) book form is prohibited unless prior --> <!-- permission is obtained from the copyright holder. --> <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" HREF="ecos-ref.html"><LINK REL="UP" TITLE="APIs" HREF="tcpip-freebsd-tcpip-apis.html"><LINK REL="PREVIOUS" TITLE="APIs" HREF="tcpip-freebsd-tcpip-apis.html"><LINK REL="NEXT" TITLE="OpenBSD TCP/IP Stack port for eCos" HREF="tcpip-openbsd.html"></HEAD ><BODY CLASS="SECT1" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >eCos Reference Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="tcpip-freebsd-tcpip-apis.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 41. APIs</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="tcpip-openbsd.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="TCPIP-FREEBSD-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 *in, fd_set *out, fd_set *ex, struct timeval *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 *in, fd_set *out, fd_set *ex, struct timeval *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 ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="tcpip-freebsd-tcpip-apis.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ecos-ref.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="tcpip-openbsd.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >APIs</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="tcpip-freebsd-tcpip-apis.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >OpenBSD TCP/IP Stack port for eCos</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
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