from multiprocessing import Process
from threading import Thread


def helper():
    time.sleep(0.1)
    return 1


def close_process(p_: Process):
    p.terminate()
    p_.close()


if __name__ == "__main__":
    process_list = []
    for _ in range(1):
        p = Process(target=helper)
        p.start()
        time.sleep(0.2)
        process_list.append(p)

    for _ in range(1):
        t = Thread(target=close_process, args=(process_list[_],))
        t.start()

    new_p = Process(target=helper)
    time.sleep(0.2)
    new_p.start()

    def close(self):
        '''
        Close the Process object.

        This method releases resources held by the Process object.  It is
        an error to call this method if the child process is still running.
        '''
        if self._popen is not None:
            if self._popen.poll() is None:
                raise ValueError("Cannot close a process while it is still running. "
                                 "You should first call join() or terminate().")
            self._popen.close()
            self._popen = None
            import time
            time.sleep(5)
            del self._sentinel
            _children.discard(self)
        self._closed = True