On Mon, Aug 12, 2002 at 06:24:58PM +0100, John Latham wrote:
> This is not actually an undocumented feature change, but it is understated!
> :-)
>
> Fvwm 2.2.4 man page says: ``Fvwm remains fully functional during a wait.''
>
> Fvwm 2.4.8 man page says ``Fvwm remains partially functional during a wait.''
It's just a better description of what actually happens. The Wait
command itself was not changed in any relevant way.
> I spotted the one word difference after a few hours tracking down the cause of
> a very strange behaviour. Presumeably, you have optimised away some threads
> that had a memory/CPU overhead, and perhaps never imagined anybody would be
> using Wait in a clever (=stupid!) way.
>
> Alas, in AnotherLevelUp I was using Wait in a multi-threaded way,
There is no multi threading in fvwm.
> waiting for
> an effect from a form which prompts the user to save his/her current
> preferences, if they have been changed since last saved; when he/she asks for
> a new set of preferences to be loaded. So we had a Wait active at the same
> time as a form that needed user interaction. In 2.4 this does not work as all
> the window events seem to be disabled during a Wait, all mouse clicks act on
> the root window only.
Event processing continues as usual. The modules can receive and
send data to and from fvwm, but fvwm ignores all module input
until the wait finishes. As this was the same in 2.2.x, I'm not
sure what was changed. In general: Wait + using modules = bad.
> It probably serves me right! I have rewritten it to work in a different, and
> single threaded, way.
Good idea. TH Wait command is really just meant to wait for a
window that appears quickly. Any other use is asking for trouble.
You can easily achieve the same benefits with FvwmEvent, but
without the bad side effects.
> Is it worth writing some hints in the man page indicating what sort of things
> do not work during a Wait -- or am I likely to be the only person daft enough
> to try abusing Wait in this way? :-)
I'll add something.
Bye
Dominik ^_^ ^_^
--
Dominik Vogt, dominik.vogt_at_gmx.de
Reply-To: dominik.vogt_at_gmx.de
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Received on Mon Aug 12 2002 - 18:14:01 BST