XDestroyWindow can not really close the window

[Ilya Anfimov]

On Thu, May 10, 2018 at 06:23:08PM -0700, Alan Coopersmith wrote:
> On 05/10/18 06:17 PM, pengyixiang wrote:
> > Hello, everyone!
> >     I'm a newbie in xlib, I need to close the window while won't close the
> > program, [1] is my test code, here's the result in [2], XDestroyWindow passed,
> > but the window haven't close, Haven't I get the key to code it?
> 
> XDestroyWindow() just puts the request in the Xlib buffer but does not send
> it to the X server.

 I  think, it could be useful to note, that it does not necessary
send request to a server. It may. In  some  circumstances  or  on
some implementations. But it is not required to do so.

> 
> You need to put an XFlush() before the infinite sched_yield loop to cause it to
> be sent to the server, or remove the infinite sched_yield loop to allow the
> program to loop back around to the XNextEvent() call which also flushes the
> Xlib request buffer.  (Though then you'll end up in an infinite error loop
> trying to destroy already destroyed windows.)
> 
> 
> -- 
> 	-Alan Coopersmith-               alan.coopersmith at oracle.com
> 	 Oracle Solaris Engineering - https://blogs.oracle.com/alanc
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