add_completion

Adds function to be executed from inside async_context with the default priority.

Use this when you want to complete an action in async_context's main loop, as soon as possible.

Parameters:

async_context	the MainContext to dispatch the I/O watch in, or null for the default context
function	the callback to invoke
data	user data to pass to function

Returns:

a SocketSource, which can be removed from async_context with destroy .