First, we set the number of runners to num_runners = 3 in order to set the final goal on the next line through the Barrier directive. The runners are set in the runners' list; each of them will have an arrival time that is determined in the runner function, using the randrange directive.

When a runner arrives at the finish line, call the wait method, which will block all the runners (the threads) that have made that call. The output for this is as follows:

START RACE!!!!
Dewey reached the barrier at: Sat Feb 2 21:44:48 2019 

Huey reached the barrier at: Sat Feb 2 21:44:49 2019 

Louie reached the barrier at: Sat Feb 2 21:44:50 2019 

Race over!

In this case, Dewey won the race.