Re: python-hackers-list Digest, Vol 21, Issue 2

[Timo <timovwb gmail com>]

Op 12-01-12 19:39, Richard Procter schreef:
> On 13/01/2012, at 1:00 AM, python-hackers-list-request gnome org wrote:
> > Message: 1
> > Date: Thu, 12 Jan 2012 10:46:51 +0100
> > From: Matthias Vogelgesang<matthias vogelgesang gmail com>
> > To: python-hackers-list gnome org
> > Subject: C-thread calling Python
> > Message-ID:
> > 	<CAOHB9GN10D_jsYD-McXGzH=PD4YB4Ro0S1nT9MyZFb9i+-USdQ mail gmail com>
> > Content-Type: text/plain; charset=UTF-8
> >
> > Hi,
> >
> > I am facing a problem that I hope some of you could help me solve. I
> > have a third-party library written in C based on GObject. This library
> > exports a class that is meant to be subclassed in C or Python. After
> > some initialization, a manager (written in C) creates one thread per
> > instance and calls a method of this associated instance and waits
> > until all calls are finished. This works fine in C and Python as long
> > as the subclasses are written in C. However, if written in Python the
> > method is called but execution is blocked. I guess Python's GIL is the
> > root of this problem, because the interpreter is still holding the
> > lock and the subclass instances are never able to acquire it.
> Hi Matthias,
>
> This is just a guess but check that gobject.init_threads() has been called.
Small correction, it should be gobject.threads_init()

Cheers,
Timo

> IIRC, without it gobject doesn't actually release and re-aquire the GIL when
> executing outside of the python interpreter. It had me puzzled for quite a
> while.
>
> warm regards,
> Richard.
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