zeromq/libzmq — pull request #510 by miniway (2013-02-01 08:53:57+00:00)
Title: LIBZMQ-497 there could be unsent bytes in encoder

When we send a large message, the message can be splitted into two chunks.
One is in the encoder buffer and the other is the zero-copy pointer.
The session could get the term before the last chunk is sent.