Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!thunder.mcrcim.mcgill.edu!snorkelwacker.mit.edu!mintaka!olivea!uunet!cbmvax!peter
From: peter@cbmvax.commodore.com (Peter Cherna)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: front/back gadget and WindowToFront
Message-ID: <22584@cbmvax.commodore.com>
Date: 19 Jun 91 18:03:01 GMT
References: <1991Jun19.001605.3317@crash.cts.com>
Reply-To: peter@cbmvax.commodore.com (Peter Cherna)
Organization: Commodore-Amiga, Inc.  West Chester, PA.
Lines: 29

In article <1991Jun19.001605.3317@crash.cts.com> hawk@pnet01.cts.com (John Anderson) writes:
>  I made a clock program under KS2.0 that brings itself to the front         
>every 30 seconds.  However, if you happen to click and drag the mouse button 
>on workbench just as the clock window brings itself to the front, the mouse  
>freezes.

There is no fully safe way for an application to freeze a shared screen,
such as the Workbench screen, while still getting input through Intuition.
A deadlock can result.  However, Workbench must do this to allow dragging
of icons.  The technique to use is to set-up a watchdog task that looks
for a deadlock and breaks the freeze.  So for Workbench, that means
if you're dragging icons and some other major event (eg. a new window
or a depth-change) comes along, the system deadlocks for about a second,
and then Workbench recovers.

>  The same thing happens any time you press left mouse button then   
>right mouse button to send a screen to the back. Is this a bug or feature :-)

Under early releases of 2.0, Workbench drag selection began as soon as
you clicked down in a Workbench window.  Under 2.04, you must first
move the mouse a small distance before drag-selection begins.  That
will cure your problem.

     Peter
--
Peter Cherna, Operating Systems Development Group, Commodore-Amiga, Inc.
{uunet|rutgers}!cbmvax!peter    peter@cbmvax.commodore.com
My opinions do not necessarily represent the opinions of my employer.
"Gosh, didn't he have anything positive to say at all?"