From: reynhout@...
Date: 2009-07-14T21:07:33+09:00
Subject: Re: C ext / threading / callback issue, ruby-1.9.1p129

On Tue, Jul 14, 2009 at 10:57:07AM +0900, Roger Pack wrote:
> 
> > There's a watcher thread (in C) that waits for an event (the creation of
> > a file), then triggers whichever callback is specified.
> 
> Hmm.  MRI isn't "used" to other threads running--are you running 1.8.6 
> or something else?

I'm using 1.9.1p129, but I tried the FFI version under 1.8.6 too, and
got similar MRI crashes and/or stuck threads.  I did wrap the callback
invocation inside rb_thread_blocking_region, though I'm not sure it's
necessary for this sample code.

I haven't written a 1.8.6 version of the C ext (the syntax/semantics
are slightly different than 1.9), but I'd be very surprised to see
anything change -- these failures are consistent with MRI through
multiple versions and approaches.

This code DOES work correctly under JRuby.  JRuby has a different
threading model, of course, but I don't understand it well enough to
determine why it fails under MRI.

Sample code and details at: http://github.com/reynhout/callme/

Thanks again,
Andrew


-- 
reynhout@quesera.com