Hi, somehow, after typing code from book i managed only to make my code stuck at infinite loop. I did comparision side by side of my code to that i get from zipped examples i got with book (code from zip works ok). I can’t find where did i do mistake. Can anyone spot what did do wrong? I know i can move on, i understand what is going on, but it’s driving me nuts, beside, there is a big chance i won’t repeat that mistake if only i would know where it is 
Anyway, here’s the code:
defmodule FibSolver do
def fib(scheduler) do
send(scheduler, { :read, self })
receive do
{ :fib, n, client } ->
send(client, { :answer, n, fib_calc(n), self })
fib(scheduler)
{ :shutdown } ->
exit(:normal)
end
end
defp fib_calc(0), do: 0
defp fib_calc(1), do: 1
defp fib_calc(n), do: fib_calc(n-1) + fib_calc(n-2)
end
defmodule Scheduler do
def run(num_processes, module, func, to_calculate) do
(1..num_processes)
|> Enum.map(fn(_) -> spawn(module, func, [self]) end)
|> schedule_processes(to_calculate, [])
end
defp schedule_processes(processes, queue, results) do
receive do
{ :ready, pid } when length(queue) > 0 ->
[ next | tail ] = queue
send(pid, { :fib, next, self })
schedule_processes(processes, tail, results)
{ :ready, pid } ->
send(pid, { :shutdown })
if length(processes) > 1 do
schedule_processes(List.delete(processes, pid), queue, results)
else
Enum.sort(results, fn {n1,_}, {n2,_} -> n1 <= n2 end)
end
{ :answer, number, result, _pid } ->
schedule_processes(processes, queue, [{ number, result } | results])
end
end
end
to_process = [37, 37, 37, 37, 37, 37]
Enum.each(1..10, fn num_processes ->
{ time, result } = :timer.tc(Scheduler, :run, [num_processes, FibSolver, :fib, to_process])
if num_processes == 1 do
IO.puts(inspect(result))
IO.puts("\n # time(s)")
end
:io.format("~2B ~.2f~n", [num_processes, time/1000000.0])
end)
