create_loop             Private event loops
is.promise              Determine whether an object is a promise
later                   Executes a function later
later2-package          Utilities for Scheduling Functions to Execute
                        Later with Event Loops
later_fd                Executes a function when a file descriptor is
                        ready
next_op_secs            Relative time to next scheduled operation
promise                 Create a new promise object
run_now                 Execute scheduled operations
then                    Access the results of a promise
