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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.