Re: [perl-win32-gui-users] Avoid the appearance of a "frozen" window

[Jan D. <ja...@ac...>]

On Wed, 18 Jun 2008, Charles Alderman wrote:
> I've had some luck doing this using fork() and a pipe to communicate
> between the (pseudo) processes. On Win32, fork is emulated using perl
> threads. So it's basically the same thing. I haven't tested this on
> Perl 5.10 yet, but I've had a gui application built this way running
> and in use for more than 18 months now.
>
> Create and layout the window before spawning a new process/thread, as
> both pseudo processes can use the same gui handles.

You are not really supposed to use GUI handles from a thread that doesn't
own them (the one that has created them).  While "read" access is generally
safe, modifying GUI objects from non-owning threads isn't.  For example:

    http://blogs.msdn.com/oldnewthing/archive/2005/10/10/479124.aspx

Cheers,
-Jan