[SciPy-user] Multithreading cookbook entry
Thu Feb 21 18:02:00 CST 2008
--- Thomas Heller <firstname.lastname@example.org> wrote:
> Of course does ctypes release the GIL on foreign
> function calls. And the GIL
> is acquired if Python implemented callback functions
> call back into
> Python code.
I'm sorry, I don't understand what you just said. Can
you restate it? I will also check the ctypes docs.
> There is nothing that ctypes needs to know about the
> C function - if the
> C function is not thread safe, you must not call it
> from other threads.
How do I tell if the C function is thread safe?
> Except - if the C function makes Python api calls,
> however, the GIL must not be
> released. In this case you should use the Python
> calling convention; for details
> look up the docs (pydll and such).
My C function will make NO Python API calls. Can I
just call the Py_BEGIN_ALLOW_THREADS and
Py_BEGIN_ALLOW_THREADS macros in the C function to
allow return to another thread while the C function
calculates? Can the C function be called for another
thread? There are lots of docs. Which do you suggest
-- Lou Pecora, my views are my own.
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