Re: [pygccxml-development] Help needed with embedding

[Berserker <ber...@ho...>]

Thanks for the quick reply Roman

> This is a quick solution. By the way Py++ defines gil_guard_t class( http://pygccxml.svn.sourceforge.net/viewvc/pygccxml/pyplusplus_dev/pyplusplus/code_repository/gil_guard.py?revision=1428&view=markup )

Thanks for the link but gil_guard_t acquires and releases the GIL allowing to operate on the CPython API, instead we need to release the lock (PyEval_SaveThread) before the c++ function invocation and to acquire it again (PyEval_RestoreThread) after allowing multiple interpreters to run concurrently during the c++ code execution where no CPython API will be touched

> I guess it is possible to create custom call policy, so the code will look like:

> boost::python::class_< Foo >("Foo")
> .def("test_method_1", &Foo::test_method_1, pythread_safe<return_value_policy< ... > >() );

I have tried this solution with a custom policy that calls PyEval_SaveThread in the "precall" function and PyEval_RestoreThread in the "postcall" function (according to http://www.boost.org/doc/libs/1_39_0/libs/python/doc/v2/default_call_policies.html ) but unfortunately after the precall's policy boost::python works on the CPython API before of the handler invocation (converting arguments for example), instead with a custom visitor (like that in libtorrent) we can surround the c++ code invocation with PyEval_SaveThread/PyEval_RestoreThread exactly before/after its execution where, as I said before, no CPython API will be touched for sure.
I still think that something like:

> boost::python::class_< Foo >("Foo")
>     .def("test_method_1", allow_threads(&Foo::test_method_1))>; 

is the best solution, any hope to support this?

> tm.add_override_precall_code( ... )
> tm.add_default_precall_code( ... )

add_override_precall_code is exactly what we need but "strangely" no code is added when the allow_threading_transformer_t is added to the function (we still need the transformer as I mentioned above until the "visitor" patch), my code:

> tm.add_transformation(allow_threading_transformer_creator()) 
> tm.add_override_precall_code(gil_guard_code)

If I comment the "add_transformation" line, the override_precall_code is correctly added to the wrapper. Any advice?

> Is this an open source project?

It will be :)
Here it is the link http://osiris.kodeware.net/ if you are interested :)

Thanks again for your help


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