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XEventsQueued()						       XEventsQueued()

Name
  XEventsQueued – check the number of events in the event queue.

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

Arguments
  display   Specifies  a connection to a Display structure, returned from
	    XOpenDisplay().

  mode	    Specifies whether the request buffer is flushed if there  are
	    no events in Xlib's queue.	You can specify one of these con‐
	    stants: QueuedAlready, QueuedAfterFlush, QueuedAfterReading.

Returns
  The number of events.

Description
  XEventsQueued() checks whether events are queued.  If there are  events
  in  Xlib's  queue,  the routine returns immediately to the calling rou‐
  tine.	 Its return value is the number of events regardless of mode.

  mode specifies what happens if no events are found on Xlib's queue.

  ·  If mode is QueuedAlready, and there are  no  events  in  the  queue,
     XEventsQueued()  returns  zero (it does not flush the request buffer
     or attempt to read more events from the connection).

  ·  If mode is QueuedAfterFlush, and there are no events in  the  queue,
     XEventsQueued()  flushes  the  request buffer, attempts to read more
     events out of the application's connection, and returns  the  number
     read.

  ·  If mode is QueuedAfterReading, and there are no events in the queue,
     XEventsQueued() attempts to read more events  out	of  the	 applica‐
     tion's  connection	 without  flushing the request buffer and returns
     the number read.

  Note that 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 QLength() macro (see Appendix C, Macros).

  For more information, see Volume One, Chapter 8, Events.

See Also
  XQLength(), XAllowEvents(), XCheckIfEvent(), XCheckMaskEvent(), XCheck‐
  TypedEvent(), XCheckTypedWindowEvent(), XCheckWindowEvent(), XGetInput‐
  Focus(),  XGetMotionEvents(),	 XIfEvent(),  XMaskEvent(), XNextEvent(),
  XPeekEvent(), XPeekIfEvent(), XPending(),  XPutBackEvent(),  XSelectIn‐
  put(), XSendEvent(), XSetInputFocus(), XSynchronize(), XWindowEvent().

Xlib - Resource Manager					       XEventsQueued()

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