From: Andrew Reynhout <reynhout@...>
Date: 2009-07-14T22:48:52+09:00
Subject: Re: C ext / threading / callback issue, ruby-1.9.1p129

Roger Pack wrote:
> Does the callback use ruby code from within the thread blocking region?

Yes, e.g.:

rb_thread_blocking_region((rb_blocking_function_t *)w->callback, tmp_x, 
RUBY_UBF_IO, 0);

w->callback is the address of the Ruby proc.  The address is correct 
afaict, but note that this does crash MRI before the callback appears to 
execute (dereferencing failure?).  When w->callback is the address of 
the C function, the callback runs, but the Ruby threads apparently 
suspend.

Both callbacks in this sample code are very simple -- they just print 
the int value of tmp_x, which is the number of seconds since the watcher 
thread was started.

Thanks,
Andrew
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