Re: [wxperl-users] Threading in wxPerl

[Donovan A. <al...@Zo...>]

subs::parallel looks neat, but glancing at it, I would say be careful =
with it, since stack size and var duplication might eat you alive.
=20
As far as I have gone with threads in perl, a possible approach for you =
is:
=20
1> Launch your thread early in the code, decreasing the amount of =
duplicate vars.
2> Use threads::shared or Thread::Queue::* family to share data =
structures between threads
3> Setup a queue check on timer or loop iteration (or use =
Thread::Queue::Monitored or Thread::Queue::Any::Monitored? - no =
experience with these 2) within the threads that need to act on =
new/changed data.
3b> Don't recall details atm, but I think Thread::Queue can block as =
well, so you can idle until data flows in (probably a better fit for =
background process blocking on GUI providing data).
=20
Now, an approach I have taken is to actually pass perl code as a scalar =
between threads (generating it on one end, evaling it on the other).  =
There are plenty of potential gotchas on this path, which I will not go =
into here.
=20
I would also check out: http://www.presicient.com/psiche/
=20
They offer up some good reading and some interesting modules, although =
Thread::Sociable appears to be gone...possible that some of the =
performance issues with threads::shared have been resolved? =20
=20
Also, have you looked at Mattia's Wx::App::MasterMind package to see how =
he has done threading with Wx?  I have not myself, so no clue.
=20
I have used the approach I provided at the top with great success and =
very nice performance with both non-GUI apps and Win32::GUI apps, but =
not yet within a WxPerl app. =20
=20
I have also been hoping to write a test that uses one of the Event libs =
to handle my queue watching for me.
=20
Anyway, interested to know how you resolve it and any cool bits you =
discover along the way.
=20

________________________________

From: wxp...@li... on behalf of Foo JH
Sent: Tue 10/3/2006 2:45 AM
To: Sergei Steshenko
Cc: wxperl-users
Subject: Re: [wxperl-users] Threading in wxPerl



Hello Sergei,

Thanks for the reply. I don't know if this will work. The abstraction is
so clean I worry if I can control the sharing of variable at all.

And to answer your question: Perl doc says that threading will duplicate
ALL variables in the main thread. Sounds quite bad to me.

Does any1 else do threading on wxPerl?

Sergei Steshenko wrote:
> --- Foo JH <jhf...@ex...> wrote:
>
> =20
>> Hi all,
>>
>> I'm trying to write an app that does work in the background, and the =
gui
>> will show any updates based on the background job.
>>
>> The thing is, Perl's threading duplicates all variables. I wonder how =
in
>> a new thread, I can continue to work on the control objects in the =
main
>> thread.
>>
>> Any best practice in this area is appreciated.
>>
>> Thanks.
>>
>> =
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>
> Does Perl threading also duplicate global variables ?
>
> Have you considered subs::parallel - to be found as
>
> =
http://search.cpan.org/~nilsonsfj/subs-parallel-0.07/lib/subs/parallel.pm=

>
> ?
>
> The latter, I believe, hides threads from you, so you just have to =
think
> how to synchronize the subroutines.
>
> --Sergei.
>
>
>
>
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