_signals_windows.py 文件源码

def _sketch_raise_in_main(exc):
    ''' Sketchy way to raise an exception in the main thread.
    '''
    if isinstance(exc, BaseException):
        exc = type(exc)
    elif issubclass(exc, BaseException):
        pass
    else:
        raise TypeError('Must raise an exception.')

    # Figure out the id of the main thread
    main_id = threading.main_thread().ident
    thread_ref = ctypes.c_long(main_id)
    exc = ctypes.py_object(exc)

    result = ctypes.pythonapi.PyThreadState_SetAsyncExc(
        thread_ref,
        exc
    )

    # 0 Is failed.
    if result == 0:
        raise SystemError('Main thread had invalid ID?')
    # 1 succeeded
    # > 1 failed
    elif result > 1:
        ctypes.pythonapi.PyThreadState_SetAsyncExc(main_id, 0)
        raise SystemError('Failed to raise in main thread.')