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Run the io_context object's event processing
loop.
count_type run();
The run()
function blocks until all work has finished and there are no more handlers
to be dispatched, or until the io_context has been stopped.
Multiple threads may call the run() function to set up a pool of threads
from which the io_context may execute handlers.
All threads that are waiting in the pool are equivalent and the io_context may choose any one
of them to invoke a handler.
A normal exit from the run() function implies that the io_context object is stopped (the
stopped()
function returns true). Subsequent
calls to run(),
run_one(),
poll()
or poll_one()
will return immediately unless there is a prior call to restart().
The number of handlers that were executed.
Calling the run()
function from a thread that is currently calling one of run(), run_one(), run_for(), run_until(), poll() or poll_one() on the same io_context object may introduce
the potential for deadlock. It is the caller's reponsibility to avoid this.
The poll()
function may also be used to dispatch ready handlers, but without blocking.