Segfault当试图从C调用一个Python函数 [英] Segfault when trying to call a Python function from C

问题描述

所以，我想从C调用一个Python回调函数。

So, I want to call a Python callback function from C.

在某种程度上，函数被发送到C并打包成一个元组， p>

At some point, the function is sent to C and packed into a tuple like this

PyObject *userData = Py_BuildValue("Oi",py_callback,some_number);

在该区域的某处，我做 Py_INCREF（py_callback）。

稍后在程序中，我想调用该函数。

Somewhere in that area, I do Py_INCREF(py_callback), too.
At some later time in the program, I want to call that function

PyObject *py_callback;
int some_number;
PyArg_ParseTuple((PyObject*)userData,"Oi",&py_callback,&some_number); // returns true
PyObject *py_result = PyObject_CallFunctionObjArgs(py_callback,
                                                   /* ... */
                                                   NULL);

，最后一次调用会引发分段错误。

and that last call throws a segmentation fault. Do you have any idea, why it would do such a thing?

推荐答案

当从Python C API中获取奇怪的行为时，总是值得仔细检查你正确地管理全局解释器锁（也称为GIL）的状态： http://docs.python.org/c-api/init.html#thread-state-and-the-global-interpreter-lock

When getting weird behaviour from the Python C API, it is always worth double checking that you are managing the state of the Global Interpreter Lock (aka "the GIL") correctly: http://docs.python.org/c-api/init.html#thread-state-and-the-global-interpreter-lock

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