What is the difference between :timer.sleep/1 and Process.sleep/1

WestKeys · January 30, 2021, 5:58pm

What is the difference between :timer.sleep/1 and Process.sleep/1 ?

al2o3cr · January 30, 2021, 6:09pm

They’re the same thing, just expressed in their respective languages:

erlang/otp/blob/7ca7a6c59543db8a6d26b95ae434e61a044b0800/lib/stdlib/src/timer.erl#L150-L155


-spec sleep(Time) -> 'ok' when
      Time :: timeout().
sleep(T) ->
    receive
    after T -> ok
    end.

github.com

elixir-lang/elixir/blob/v1.11.3/lib/elixir/lib/process.ex#L249-L254


@spec sleep(timeout) :: :ok
def sleep(timeout)
    when is_integer(timeout) and timeout >= 0
    when timeout == :infinity do
  receive after: (timeout -> :ok)
end