[GRASS5] closing monitors by click

[Markus Neteler]

On Fri, Dec 01, 2000 at 01:27:49AM -0800, Eric G . Miller wrote:
> On Tue, Nov 28, 2000 at 04:01:47PM +0000, Markus Neteler wrote:
> > Hi all,
> > 
> > an annoying problem is that you cannot close GRASS monitors
> > by mouse click. As being teaching GRASS in seminars, first
> > action of students is usually to kill a monitor with a click
> > (close of window) which runs the monitor management into troubles.
> > 
> > Helena told me that in past this procedure of closing was
> > *possible* without confusing GRASS. I wish we could (re-)implement
> > this.
> > 
> > Maybe the lock file could be ignored if the x0, x1,.. process
> > is killed (by user request).
> > 
> > But it's really a pain to teach others not to kill a monitor
> > but to use d.mon instead (or tcltkgrass).
> > 
> > Probably someone has an idea for more monitor convenience?
> > These monitor troubles are one reason that many people dislike
> > GRASS.
> > 
> > Thanks in advance
> 
> After finding that platforms handle the signal() call differently, I'm
> convinced this problem is related.  I did a few tests, and the results
> seem to indicate the XDRIVER gets blocked somewhere and won't actually
> process the destroy event until it gets unblocked.  So, for systems that
> are affected, if you click the close button on the monitor, then do
> "d.mon -L" (which should work now), the window will immediately close.
> This leads me to believe it's blocked on an open() or read() on the _rfd
> fifo file descriptor.  I haven't quite tracked it down, but I'm
> confident that's part of the problem.
Hi Eric,

you are right:

if I click the close button on the monitor, then do 
d.mon -L
name            description                    status
----            -----------                    ------

(which works!) , the window will immediately close. Even with any other
d.* command.

Hopefully this is an indicator.

Yours

 Markus

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