Expand description
Types for dealing with Nng contexts and asynchronous IO operations.
Most applications will interact with nng synchronously; that is that
functions such as Scoket::send will block the calling thread until the
operation has completed.
Asynchronous operations behave differently. These operations are initiated by the calling thread, but control returns immediately to the calling thread. When the operation is subsequently completed (regardless of whether this was successful or not), then a user supplied function (“callback”) is executed. An Aio object is associated with each asynchronous operation.
Contexts allow the independent and concurrent use of stateful operations using the same socket. For example, two different contexts created on a rep socket can each receive requests, and send replies to them, without any regard to or interference with each other.