'Determine whether the user-space send buffer for this transport is full
or not.
This extends the base determination by adding consideration of how many
file descriptors need to be sent using L{sendmsg.sendmsg}.  When there
are more than C{self._fileDescriptorBufferSize}, the buffer is
considered full.
@return: C{True} if it is full, C{False} otherwise.'

def _isSendBufferFull(self):

    return ((len(self._sendmsgQueue) > self._fileDescriptorBufferSize) or self._writeSomeDataBase._isSendBufferFull(self))
