_fileobjectposix.py 文件源码

def close(self):
        if self._closed:
            return
        self.flush()
        self._closed = True
        if self._readable:
            self.hub.cancel_wait(self._read_event, cancel_wait_ex)
        if self._writable:
            self.hub.cancel_wait(self._write_event, cancel_wait_ex)
        fileno = self._fileno
        if self._closefd:
            self._fileno = None
            os.close(fileno)

    # RawIOBase provides a 'read' method that will call readall() if
    # the `size` was missing or -1 and otherwise call readinto(). We
    # want to take advantage of this to avoid single byte reads when
    # possible. This is highlighted by a bug in BufferedIOReader that
    # calls read() in a loop when its readall() method is invoked;
    # this was fixed in Python 3.3. See
    # https://github.com/gevent/gevent/issues/675)