println("nprocs=$(nprocs())")
function x()
    turn = 1

    function work(n)
        for i=1:5
            while (turn != n)
                sleep(1)
            end
            println(n)
            turn = turn % 3 + 1
        end
    end

    @sync begin
        for n=1:3
            @async work(n)
        end
    end
end
x()