Returns a list of information about active workers (or exited
workers if worker_ids
includes them).
rrq_worker_info(worker_ids = NULL, controller = NULL)
Optional vector of worker ids. If NULL
then
all active workers are used.
The controller to use. If not given (or NULL
)
we'll use the controller registered with
rrq_default_controller_set()
.
A list of worker_info
objects