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-=pod
-
-=head1 NAME
-
-
-
-B<XPAMainLoop: optional main loop for XPA>
-
-
-
-=head1 SYNOPSIS
-
-
-
-
-
-  #include <xpa.h>
-
-  void XPAMainLoop();
-
-
-
-
-
-=head1 DESCRIPTION
-
-
-
-
-Once XPA access points have been defined, a program must enter an
-event loop to watch for requests from external programs. This can be
-done in a variety of ways, depending on whether the event loop is
-processing events other than XPA events.  In cases where there are no
-non-XPA events to be processed, the program can simply call the
-XPAMainLoop() event loop.  This loop is implemented essentially as
-follows (error checking is simplified in this example):
-
-  FD_ZERO(&readfds);
-  while( XPAAddSelect(NULL, &readfds) ){
-    if( sgot = select(swidth, &readfds, NULL, NULL, NULL) >0 )
-      XPAProcessSelect(&readfds, 0);
-    else
-      break;
-    FD_ZERO(&readfds);
-  }
-
-
-The XPAAddSelect() routine sets up the select() readfds variable so
-that select() will wait for I/O on all the active XPA channels.  It
-returns the number of XPAs that are active; the loop will end when
-there are no active XPAs. The standard select() routine is called to
-wait for an external I/O request.  Since no timeout struct is passed
-in argument 5, the select() call hangs until there is an external
-request.  When an external I/O request is made, the XPAProcessSelect()
-routine is executed to process the pending requests.  In this routine,
-the maxreq value determines how many requests will be processed: 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 is 0 to process all requests.)
-
-
-If a program has its own Unix select() loop, then XPA access points can
-be added to it by using a variation of the standard XPAMainLoop:
-
-  XPAAddSelect(xpa, &readfds);
-  [app-specific ...]
-  if( select(width, &readfds, ...) ){
-    XPAProcessSelect(&readfds, maxreq);
-    [app-specific ...]
-    FD_ZERO(&readfds);
-  }
-
-
-XPAAddSelect() is called before select() to add the access points.
-If the first argument is NULL, then all active XPA access points
-are added. Otherwise only the specified access point is added.
-After select() is called, the XPAProcessSelect() routine can be called
-to process XPA requests.  Once again, the maxreq value determines how
-many requests will be processed: if maxreq <=0, then all currently
-pending requests will be processed.  Otherwise, up to maxreq requests
-will be processed.
-
-
-XPA access points can be added to
-Xt event loops (using XtAppMainLoop())
-and
-Tcl/Tk event loops (using vwait and the Tk loop).
-When using XPA with these event loops, you only need to call:
-
-int XPAXtAddInput(XtAppContext app, XPA xpa)
-
-or
-
-  int XPATclAddInput(XPA xpa)
-
-respectively before entering the loop.
-
-
-
-
-=head1 SEE ALSO
-
-
-
-See xpa(n) for a list of XPA help pages
-
-
-=cut