On Thu, 29 May 2014 11:27:27 +0900
tsuyoshi okita <825...@gmail.com> wrote:

>Dear gurus,
>
>I've been trying let a spinner spins at the same time sending an email 
>by forking and failing.  Although a program forks, and one child process 

After reading all the replies by Brian Manning concerning
the difficulty of controlling the widget thru forks, I would
like to remind you that threads do a good job with this,
if you do it correctly. 
( My code below may not be correct, but it works. :-)
 See http://www.perlmonks.org?node_id=804402 for
a discussion.

I'm not delving into Gtk3 yet, but the attached Gtk2 code
should be modifiable to Gtk3.

0m,
zentara

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