from ctypes import cdll
import multiprocessing as mp

def foo():
    handle = cdll.LoadLibrary("./test.so")
    handle.IncA()

if __name__ == '__main__':
    foo()
    #mp.set_start_method('spawn')
    p = mp.Process(target = foo, args = ())
    p.start()
    print(p.pid)
    p.join()