WxRuby and blocking issues with a long running function

Hi All,
First time post and please forgive if this is not
the right forum for my question. I have googled a
bit, but I haven’t come across anything specific.

I have been programming with Ruby for a while now
and just started getting into using WxRuby for a
GUI based application running on Windows. I’m
having an issue with a function call from WxRuby
that takes considerable amount to time to complete
as it does spend much of its time sending and
receiving serial data as well as a few sleeps
sprinkled about. I need to be able to update a
progress bar on the GUI screen, but WXRuby is
blocked during the call. I have the long running
call in a separate thread and that seems to be
working, but the performance is pretty abysmal,
even with a timer set to allow the thread to run
at 10 msec.

Is there a callback to the Wx thread that I can
make from the long running function that will
allow the gui to update? I just need to be able to
update a progress gauge as all the other control
are disabled during the call.

Thanks for the help

Mark

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Am 04.10.2011 21:30, schrieb Mark Barton:

Hi All, First time post and please forgive if this is not the right
forum for my question. I have googled a bit, but I haven’t come
across anything specific.

Your question is wxRuby-specific, so you should post to the wxRuby
forum/mailing list; either subscribe at
http://wxruby.rubyforge.org/wiki/wiki.pl?MailingLists for the
wxruby-users ML or use ruby-forum.com at
http://www.ruby-forum.com/forum/wxruby .

I have been programming with Ruby for a while now and just started
getting into using WxRuby for a GUI based application running on
Windows. I’m having an issue with a function call from WxRuby that
takes considerable amount to time to complete as it does spend much
of its time sending and receiving serial data as well as a few
sleeps sprinkled about. I need to be able to update a progress bar
on the GUI screen, but WXRuby is blocked during the call. I have
the long running call in a separate thread and that seems to be
working, but the performance is pretty abysmal, even with a timer
set to allow the thread to run at 10 msec.

When it comes to threading, wxRuby has considerable drawbacks. So far
I’ve only been able to do concurrent programming successfully by using
separate processes, which I fear on Windows is not an option (missing
#fork).
Another way is to use wxRuby’s progress dialog (
http://wxruby.rubyforge.org/doc/progressdialog.html ) which can be
updated easily while doing another operation as it is specifically
designed for such cases (but doesn’t use threading); it even provides
an “abort” button that can easily be intercepted.

Is there a callback to the Wx thread that I can make from the
long running function that will allow the gui to update? I just
need to be able to update a progress gauge as all the other control
are disabled during the call.

You can use the Window#refresh and Window#update methods, but this
doesn’t mean you should use them. You’re doing the event loop’s work
then and the few times I’ve used it I wasn’t really able to get the
GUI resonsitive.

Vale,
Marvin

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