Victor Lin schrieb:
Hi,I am going to develop a c library binding with ctypes. That c library will call callback from worker threads it created. Here comes the problem : Will the GIL be acquired before it goes into Python function? I got a little try.. DSPPROC = WINFUNCTYPE(None, DWORD, DWORD, c_void_p, DWORD, c_void_p) def test(handle, channel, buffer, length, user): print handle, channel, buffer, length, user dsp = BASS_ChannelSetDSP(stream, DSPPROC(test), None, 123) I got "access violation" when I run it... It seems that the ctypes did't acquire GIL before it call the python callback. As the document says. WINFUNCTYPE will release GIL during the call But it does not mention callback about Python function? How about a call from another thread? Could somebody help me?
The releasing takes only place when entering a c-function. A python-callback acquires the GIL, see callbacks.c in the python source.
The access violation has nothing to do with that I presume, that's just a general programming error as it happens with ctypes during development.
Diez -- http://mail.python.org/mailman/listinfo/python-list
