nng_aio5
Asynchronous i/o handle
Usage
#include <nng/nng.h> typedef struct nng_aio nng_aio;
Overview
An nng_aio is an opaque structure used in conjunction with asynchronous I/O operations. Every asynchronous operation uses one of these structures, each of which can only be used with a single operation at a time.
Asynchronous operations are performed without blocking calling application threads. Instead the application registers a callback function to be executed when the operation is complete (whether successfully or not). This callback will be executed exactly once.
The asynchronous I/O framework also supports cancellation of operations that are already in progress (see nng_aio_cancel()), as well setting a maximum timeout for them to complete within (see nng_aio_set_timeout()).
It is also possible to initiate an asynchronous operation, and wait for it to complete using nng_aio_wait().
These structures are created using the nng_aio_alloc(), and destroyed using nng_aio_free().