floodlight/indigo — pull request #158 by rlane (2014-07-25 21:44:00+00:00)
Title: OFConnectionManager: add notifications for barriers

Reviewer: @harshsin

Some modules may wish to defer work until a barrier is received. This new
interface allows them to register to be notify when a (blocked) barrier
arrives on a connection. The module should then decide whether it holds a
barrier blocker on that connection, and if so finish its work and unblock the
barrier.