For this use case the PyGILState API was introduced.
e.g. try
PyGILState_STATE state = PyGILState_Ensure()
run python code
PyGILState_Release(state)
Stefan
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On
> Behalf Of Bryan
> Sent: Monday, October 23, 2006 2:32 PM
> To: python-list@python.org
> Subject: python thread state
>
> hi,
>
> i'm trying to write a multithreaded embedded python
> application and i'm having some trouble. i found this
> article "embedding python in multi-threaded c/c++
> applications" in the python journal
> (http://www.linuxjournal.com/article/3641) but there still
> seems to be a step missing for me.
>
> each time a function in my c module is called, it's called on
> a different c thread. i would then like to call a function
> in an embedded python script.
> from my understanding of the article, you can associate a
> python script with a c thread by calling PyThreadState_New as
> in this code:
>
> // save main thread state
> PyThreadState * mainThreadState = NULL;
> mainThreadState = PyThreadState_Get();
> PyEval_ReleaseLock();
>
> // setup for each thread
> PyEval_AcquireLock();
> PyInterpreterState * mainInterpreterState =
> mainThreadState->interp PyThreadState * myThreadState =
> PyThreadState_New(mainInterpreterState);
> PyEval_ReleaseLock();
>
> //execute python code
> PyEval_AcquireLock();
> PyThreadState_Swap(myThreadState);
> # execute python code
> PyThreadState_Swap(NULL);
> PyEval_ReleaseLock();
>
>
> unfortunately, this doesn't work for me because each time i
> get called to execute python code, i'm in a new c thread and
> PyThreadState_Swap seems to want to be executed in the same c
> thread that PyThreadState_New was executed in. if this isn't
> the case, please let know.
>
> i then called PyThreadState_New each time i wanted to call a
> python function in the script, but PyThreadState_New wipes
> out, or rather gives you a new global dictionary, because i
> lost all my global variables. the article assumes you have
> one c thread per python thread state, but i want multiple c
> threads per python thread state. Is there a c api function
> that will associate a c thread without resetting the global
> dictionary?
>
> thank you,
>
> bryan
>
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