hpux man page for xflushgc

XFlushGC()																XFlushGC()

Name
  XFlushGC - force cached GC changes to the server.

Synopsis
  void XFlushGC(display, gc)
	 Display *display;
	 GC gc;

Arguments
  display   Specifies the connection to the X server.

  gc	    Specifies the graphics context.

Availability
  Release 5 and later.

Description
  Xlib	normally  defers  sending  changes to the components of a GC to the server until a graphics function is actually called with that GC.
  This permits batching of component changes into a single server request.  In some circumstances, however,  it  may  be  necessary  for  the
  client  to explicitly force sending of the changes to the server.  An example might be when a protocol extension uses the GC indirectly, in
  such a way that the extension interface cannot know what GC will be used.  In a case like this, the extension library could use  XFlushGC()
  to force any cached changes to the GC it will use to be flushed to the server.

See Also
  XChangeGC(), XSetForeground().

Xlib - Graphics Context 														XFlushGC()