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Is Python/C api thread safety enough?

 
 
Casper
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      11-20-2004
i make a multi thread C/C++ program emded python, each thread running a python sub-interpreter, to make it safety i make code as following between acquire/release the globle interpreter lock:
Py_BEGIN_ALLOW_THREADS
func_take_a_long_time()
Py_END_ALLOW_THREADS
according to the python document this will avoid to block other thread that running python code since the function will take a long time, but i am wandered if the code of func_take_a_long_time() call a Python/C api, is this conflict with other threads and cause fatal error? i have release the interpreter lock in Py_BEGIN_ALLOW_THREADS and without protected from thread conflict, so if the func_take_a_long_time() call a Python/C api, it perhaps use other thread's context to running python code.

Can sombody tell me is this possible? Thanks first.


Donnie Leen



 
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Nick Coghlan
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      11-20-2004
Casper wrote:
> Can sombody tell me is this possible? Thanks first.


If you're going to call the Python C/API, you need to be holding the GIL. So you
either can't release it, or the long-running function has to use
PyGILState_Ensure when it needs to call the Python C/API.

Cheers,
Nick.
 
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