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+>Enhanced Select()</TITLE
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+>Chapter 41. APIs</TD
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+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
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