-- demo\rosetta\Generator_Exponential.exw
without js -- tasks

atom res
bool terminate = false

procedure powers(integer p)
    integer i = 0
    while not terminate do
        res = power(i,p)
        task_suspend(task_self())
        task_yield()
        i += 1
    end while
end procedure

constant squares = task_create(powers,{2}),
         cubes   = task_create(powers,{3})

atom square, cube
task_schedule(cubes,1)
task_yield()
cube = res
sequence snq = {}
for i=1 to 30 do
    do
        task_schedule(squares,1)
        task_yield()
        square = res
        while cube<square do
            task_schedule(cubes,1)
            task_yield()
            cube = res
        end while
    until square!=cube
    if i>20 then snq &= square end if
end for
?snq
terminate = 1
wait_key()