Thanks, Thomas. The answer to most of your questions is that I'm very
new at this!
I'm asking this on the forums you suggested.
- Paul
On Thu, 01 Jul 2010 19:23:53 +0200, Thomas Jollans
<tho...@jollans.com> wrote:
>On 06/30/2010 09:28 PM, p...@mail.python.org wrote:
>> I have a problem with threading using the Python/C API. I have an
>> extension that implements a timer, and the C++ timer callback function
>> calls a Python function. The relevant code looks like this:
>>
>> [snip]
>>
>> static void CALLBACK PeriodicTimer(UINT wTimerID, UINT msg,
>> DWORD dwUser, DWORD dw1, DWORD dw2)
>
>This looks frightfully WIN32. How are you calling a timer? I'm guessing
>you're using some win32 function. So my tentative tip on where the
>problem might lie is the interaction of Python's PyThreads and the win32
>threading primitives you're probably calling.
>
>> {
>> PyGILState_STATE pgs;
>>
>> pgs = PyGILState_Ensure();
>> if(attrsetFlag)
>> {
>> pres = PyObject_CallFunction(attr,NULL);
>> if( pres == NULL )printf("CallFunction failed!\n");
>> }
>> PyGILState_Release( pgs );
>>
>> }
>>
>> The Python code that sets this up looks like this:
>>
>> fetimer.setmodname("Timeslice3")
>> fetimer.setprocname("Timetester")
>
>I'm sure this isn't the problem, but why aren't you just passing in an
>object? As in fetimer.setcallable(Timeslice3.Timetester)?
>
>> [ snip ]
>>
>> Fatal Python Error: This thread state must be current when releasing
>>
>> Fatal Python Error: PyThreadState_DeleteCurrent: no current tstate
>>
>> Fatal Python Error: PyEval_SaveThread: NULL tstate
>
>As I said, I'd expect there to be some irregularities between what
>PyThreads would normally do and what you're doing in the code you didn't
>post.
>
>>
>> Can anybody help me make this code stable, so that it works all the
>> time?
>
>I can't really help you - I have limited experience with the C API, let
>alone Python/C threading, and know next to nothing about Windows
>programming. Maybe you should ask in a more specialized (and quieter)
>forum, such as the CAPI-SIG mailing list, or python-win32.
>
>-- Thomas
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