Application.ex

defmodule Tasksups.Application do
  # See https://hexdocs.pm/elixir/Application.html
  # for more information on OTP Applications
  @moduledoc false

  use Application
  # use Supervisor

  def start(_type, _args) do
    import Supervisor.Spec, warn: false
    # List all child processes to be supervised
    children = [
      # Starts a worker by calling: Tasksups.Worker.start_link(arg)
      # {Tasksups.Worker, arg},
      supervisor(Task.Supervisor, [[name: Tasksups.TaskSupervisor, restart: :transient]]),
      supervisor(Task.Supervisor, [[name: Tasksups.ConflyggsTaskSupervisor, restart: :transient]])
    ]

    # See https://hexdocs.pm/elixir/Supervisor.html
    # for other strategies and supported options
    opts = [strategy: :one_for_one, name: Tasksups.Supervisor]
    Supervisor.start_link(children, opts)
  end
end

Conflyggs.ex

defmodule Tasksups.Conflyggs do

  def hello do
    Task.Supervisor.async_nolink Tasksups.ConflyggsTaskSupervisor, fn ->
      :timer.sleep(10000)
      IO.puts "hi Shahryar tavakkoli"
    end
  end

  def by do
    Task.Supervisor.async_nolink Tasksups.ConflyggsTaskSupervisor, fn ->
      :timer.sleep(10000)
      IO.puts "by Shahryar tavakkoli"
    end
  end

end

Tasksups.ex

defmodule Tasksups do

  def hello do
    Task.Supervisor.async_nolink Tasksups.TaskSupervisor, fn ->
      :timer.sleep(10000)
      IO.puts "hi Shahryar tavakkoli"
    end
  end

  def by do
    Task.Supervisor.async_nolink Tasksups.TaskSupervisor, fn ->
      :timer.sleep(10000)
      IO.puts "by Shahryar tavakkoli"
    end
  end

end