hpux man page for xqlength

XQLength()																XQLength()

Name
  XQLength, QLength - return the number of events on the queue.

Synopsis
  int XQLength(display)
	   Display *display;

Arguments
  display   Specifies a connection to an X server; returned from XOpenDisplay().

Returns
  The number of events on the queue.

Description
  XQLength() returns the number of events currently on the queue for the connected display.  Note that there may be more events that have not
  yet been read into the queue (see XEventsQueued()).

  The C language macro QLength() is equivalent and slightly more efficient.

See Also
  XEventsQueued(), XPending(), XPeekEvent().

Xlib - Macro Equivalents														XQLength()