How to create module based Tasks

Can you show your supervisor as well?

i m not using module based Supervisor

Sou you are just doing elixir yourscript?

Then your script ends even before the supervisor has fully started.

Or what exactly is your problem?

ow…excuse-me i forgive to explain the error !
I got this error in shell:

** (UndefinedFunctionError) function Task.__using__/1 is undefined or private
(elixir) Task.__using__([])
module-task.exs:3: (module)
module-task.exs:1: (file)

Probably your elixir is to old.

I checked branches and Task.__using__/1 only exists in 1.5 branch.

the version is 1.4.2

As you can see, Task.__using__/1 does not exist in v1.4.2, so if you want to use it, you need to update.

https://github.com/elixir-lang/elixir/blob/v1.4.2/lib/elixir/lib/task.ex

Also you can take a look at the documentation of 1.4.2, the example there does not mention any use of use

i update to 1.5.2 like a doc i m read
But now i got other error:

** (UndefinedFunctionError) function Supervisor.start_link/1 is undefined or private. Did you mean one of:

  * start_link/2
  * start_link/3

but It is exact like the doc…

Supervisor.start_link/1 not exists…

This doc like wrong…

The docs are wrong.

number = 5
Supervisor.start_link([{TaskModule, number}], strategy: :one_for_one)

Since your module takes a number and adds 2 to it, we’re passing in a number (5) as the argument. You can pass in whatever you like.

See also: Supervisor — Elixir v1.20.2