XSync man page on DigitalUNIX

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XFlush(3X11)							  XFlush(3X11)

NAME
       XFlush,	XSync, XEventsQueued, XPending - handle output buffer or event
       queue

SYNOPSIS
       XFlush(display)
	       Display *display;

       XSync(display, discard)
	       Display *display;
	       Bool discard;

       int XEventsQueued(display, mode)
	       Display *display;
	       int mode;

       int XPending(display)
	       Display *display;

ARGUMENTS
       Specifies a Boolean value that indicates	 whether  XSync	 discards  all
       events  on  the event queue.  Specifies the connection to the X server.
       Specifies the mode. You can pass	 QueuedAlready,	 QueuedAfterFlush,  or
       QueuedAfterReading.

DESCRIPTION
       The XFlush function flushes the output buffer. Most client applications
       need not use this function because the output buffer  is	 automatically
       flushed	as  needed by calls to XPending, XNextEvent, and XWindowEvent.
       Events generated by the server may be enqueued into the library's event
       queue.

       The  XSync  function flushes the output buffer and then waits until all
       requests have been received and processed by the X server.  Any	errors
       generated must be handled by the error handler. For each protocol error
       received by Xlib, XSync calls the client application's  error  handling
       routine	(see  section  11.8.2). Any events generated by the server are
       enqueued into the library's event queue.

       Finally, if you passed False, XSync does not discard the events in  the
       queue.  If  you	passed	True,  XSync discards all events in the queue,
       including those events that were on the queue before XSync was  called.
       Client applications seldom need to call XSync.

       If  mode	 is  QueuedAlready, XEventsQueued returns the number of events
       already in the event queue (and never performs a system call). If  mode
       is QueuedAfterFlush, XEventsQueued returns the number of events already
       in the queue if the number is nonzero. If there are no  events  in  the
       queue,  XEventsQueued  flushes the output buffer, attempts to read more
       events out of the application's	connection,  and  returns  the	number
       read.  If  mode is QueuedAfterReading, XEventsQueued returns the number
       of events already in the queue if the number is nonzero. If  there  are
       no  events in the queue, XEventsQueued attempts to read more events out
       of the application's connection without flushing the output buffer  and
       returns the number read.

       XEventsQueued  always  returns  immediately  without  I/O  if there are
       events already in the queue.  XEventsQueued with mode  QueuedAfterFlush
       is   identical  in  behavior  to	 XPending.   XEventsQueued  with  mode
       QueuedAlready is identical to the XQLength function.

       The XPending function returns the  number  of  events  that  have  been
       received	 from  the  X  server but have not been removed from the event
       queue.	XPending  is  identical	 to  XEventsQueued   with   the	  mode
       QueuedAfterFlush specified.

SEE ALSO
       AllPlanes(3X11), XIfEvent(3X11), XNextEvent(3X11), XPutBackEvent(3X11)

       Xlib -- C Language X Interface

								  XFlush(3X11)
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