On 3月8日, 下午10時20分, Christian Heimes <li...@cheimes.de> wrote: > Victor Lin wrote: > > 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? > > You can't call Python code from an arbitrary thread. Before you are > allowed to call a Python function from a thread, you must enable > Python's threading subsystem and register the thread. Python need to > store information (like the exception information) in a thread local > variable (TLS). > > I can't tell you how to register your thread with Python, though. > > Christian
I know I have to call PyEval_InitThreads if my module create threads that will contact python stuff, for example, call a python callback function from threads. But however, it is ctypes. I have no idea should I do that for the imported dll? If it is, how? Thanks. -- http://mail.python.org/mailman/listinfo/python-list
