Python解释器在使用C extension for python时崩溃

Question

我在python中使用ctypes模块在C中编写库，然后从python访问它。这是我的C代码：

#import <math.h>
#include <stdio.h>

void convolution(int *array, int length) {
    int i;
    int p = 0;
    for(i=0;i<length;i++){
        array[i] += 1;
     }
}

这是我的python代码：

import ctypes
import numpy
import locate_file
working_directory = locate_file.locate_file()

_convolution_ = ctypes.cdll.LoadLibrary(working_directory +'libconvolution.so')

class image_type() : 

    def from_param(self,param) : 
        typename = type(param).__name__
        if hasattr(self,'from_'+typename) : 
            return getattr(self,'from_'+typename)(param)
        else : 
            raise TypeError('type %s not supported' %typename)

    def from_list(self,param) : 
        c_array = numpy.ascontiguousarray(param,dtype=int)
        pointer = c_array.ctypes.data_as(ctypes.c_void_p)

    def from_tuple(self,param) : 
        return self.from_list(param)

    def from_ndarray(self,param) : 
        return self.from_list(param)

image_type_ = image_type()

_convolution_.convolution.argtypes = [image_type_,ctypes.c_int]
_convolution_.convolution.restype = ctypes.c_void_p

def convolution(array) : 
    _convolution_.convolution(array,ctypes.c_int(len(array)))
    return None

m = [1,2,3,4,5]
convolution(m)

问题是每次运行这个python代码时，我的python崩溃了。我知道没有在ctypes中初始化函数的argtypes和restypes会导致python崩溃，但我相信我已经把它弄错了。我哪里错了？