XFlush(3X11)            COMMAND REFERENCE            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
     discard   Specifies a Boolean value that indicates whether
               XSync discards all events on the event queue.

     display   Specifies the connection to the X server.

     mode      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 error event received by Xlib, XSync calls
     the client application's error handling routine (see section
     8.12.2).  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



X Version 11            1 September 1988                        1

XFlush(3X11)            COMMAND REFERENCE            XFlush(3X11)



     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
     XIfEvent(3x11), XNextEvent(3x11), XPutBackEvent(3x11)
     Xlib - C Language X Interface






























X Version 11            1 September 1988                        2

%%index%%
na:360,133;
sy:493,1069;
de:1562,3533;
se:5095,318;
%%index%%000000000085