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.\" ========================================================================
.\"
.IX Title "xpapoll 3"
.TH xpapoll 3 "July 23, 2013" "version 2.1.15" "SAORD Documentation"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
\&\fBXPAPoll: execute existing \s-1XPA\s0 requests\fR
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <xpa.h>
\&
\& int XPAPoll(int msec, int maxreq);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
It is sometimes desirable to implement a polling loop, i.e., where one
checks for and processes \s-1XPA\s0 requests without blocking. For this
situation, use the \fIXPAPoll()\fR routine:
.PP
.Vb 1
\& XPAPoll(int msec, int maxreq);
.Ve
.PP
The \fIXPAPoll()\fR routine will perform \fIXPAAddSelect()\fR and \fIselect()\fR, but with a
timeout specified in millisecs by the msec argument. If one or more
\&\s-1XPA\s0 requests are made before the timeout expires, the \fIXPAProcessSelect()\fR
routine is called to process those requests. The maxreq value determines
how many requests will be processed: if maxreq < 0, then no events are
processed, but instead, the return value indicates the number of events
that are pending. If maxreq == 0, then all currently pending requests
will be processed. Otherwise, up to maxreq requests will be processed.
(The most usual values for maxreq are 0 to process all requests and 1
to process one request).
.SH "SEE ALSO"
.IX Header "SEE ALSO"
See xpa(n) for a list of \s-1XPA\s0 help pages
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