What could possibly be wrong with respect to this code : defmodule Test do def main do Process.spawn(self(), Test.test()) end def test do IO.puts("Test ok"); end end Error message : Test ok ** (ArgumentError) argument error erlang.erl:2876: :erlang.spawn_opt(#PID<0.102.0>, :ok)…

You are calling Test.test/0 which prints Test ok and then returns :ok, this return value of Test.test/0 is then passed to spawn/1. You probably want spawn(&test/0) to pass a “function capture” to spawn/1.

Proces.spawn/2 takes a function of arity 1 as its first argument, though you pass a pid, also the second argument should be of type Process.spawn_opts/0, which is a list of Process.spawn_opt/0, though you pass the atom :ok. What do you actually want to do?

Then pass that function as first argument to Kernel.spawn/1, you rarely need to actually use the Process.spawn/* functions.

There is still the same error this time : erlang.spawn(:ok)

Then you are not passing a function, as :ok is an atom. Can you share your code?

defmodule Test do def main do spawn(Test.test()) end def test do IO.puts("Test ok") end end

Working with the Process.spawn function

Questions & Help Questions

gzah March 6, 2020, 3:58pm 3

I want to spawn a process from another function that outputs a specific text.