[PyKDE] Fwd: sip_is_py_method

Patrick patrickkidd at gci.net
Tue Aug 24 06:51:27 BST 2004

Anyway, Phil, in response to you suggesting I 'compile with tracing enabled', 
I've done it  with PyQt, but my problem lies with my sip-generated module 
wrapping my C++ library.

> On Sunday 01 August 2004 9:56 pm, Patrick wrote:
> > I've run into a problem with virtual functions and sip-4. The problem does
> > not exist in sip-3.
> >
> > I have a superclass with a (non-pure) virtual function, and a couple of
> > subclasses that re-implement it. I create an object or two of the
> > subclasses and register them with my C++ library through an exposed python
> > method. My C++ code then calls the virtual functions, which are *not*
> > reimplemented in python.
> > The problem is that when sip_api_is_py_method is called, that thread stops
> > when it tries to acquire the GIL. I have checked that don't have ANY calls
> > from C++ into python via virtual methods (which is where another thread
> > could have acquired the lock and not returned),
> >
> > Where else should I look, and would this be some sort of a bug or another
> > caveat for using C++ bindings?
> I'd rebuild with tracing enabled to make absolutely sure what's actually 
> called and when.
> If sip_api_is_py_method() is blocking then it must be in the call to 
> PyGILState_Ensure(). The latter is a small function so it should be easy to 
> add debug statements to it and see exactly what's going on.
> Phil

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