From 86b6e7047803c45f0e4fabe35473df335a2b5f7c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Valim?= <jose.valim@plataformatec.com.br>
Date: Fri, 23 Oct 2015 14:53:40 +0200
Subject: Add Supervisor.stop

---
 lib/elixir/lib/agent/server.ex             | 15 ---------------
 lib/elixir/lib/supervisor.ex               | 16 ++++++++++++++++
 lib/elixir/test/elixir/supervisor_test.exs |  8 +++-----
 3 files changed, 19 insertions(+), 20 deletions(-)

diff --git a/lib/elixir/lib/agent/server.ex b/lib/elixir/lib/agent/server.ex
index 3bef67e4c..c432bfed8 100644
--- a/lib/elixir/lib/agent/server.ex
+++ b/lib/elixir/lib/agent/server.ex
@@ -23,10 +23,6 @@ defmodule Agent.Server do
     {:reply, :ok, run(fun, [state])}
   end
 
-  def handle_call(:stop, _from, state) do
-    {:stop, :normal, :ok, state}
-  end
-
   def handle_call(msg, from, state) do
     super(msg, from, state)
   end
@@ -43,17 +39,6 @@ defmodule Agent.Server do
     {:ok, run(fun, [state])}
   end
 
-  def terminate(_reason, _state) do
-    # There is a race condition if the agent is
-    # restarted too fast and it is registered.
-    try do
-      self |> :erlang.process_info(:registered_name) |> elem(1) |> Process.unregister
-    rescue
-      _ -> :ok
-    end
-    :ok
-  end
-
   defp initial_call(mfa) do
     _ = Process.put(:"$initial_call", get_initial_call(mfa))
     :ok
diff --git a/lib/elixir/lib/supervisor.ex b/lib/elixir/lib/supervisor.ex
index 9d6156ad5..231a4339e 100644
--- a/lib/elixir/lib/supervisor.ex
+++ b/lib/elixir/lib/supervisor.ex
@@ -463,6 +463,22 @@ defmodule Supervisor do
     call(supervisor, :count_children) |> :maps.from_list
   end
 
+  @doc """
+  Stops the supervisor with the given `reason`.
+
+  It returns `:ok` if the supervisor terminates with the given
+  reason, if it terminates with another reason, the call will
+  exit.
+
+  This function keeps OTP semantics regarding error reporting.
+  If the reason is any other than `:normal`, `:shutdown` or
+  `{:shutdown, _}`, an error report will be logged.
+  """
+  @spec stop(supervisor, reason :: term, timeout) :: :ok
+  def stop(supervisor, reason \\ :normal, timeout \\ 5_000) do
+    :gen.stop(supervisor, reason, timeout)
+  end
+
   @compile {:inline, call: 2}
 
   defp call(supervisor, req) do
diff --git a/lib/elixir/test/elixir/supervisor_test.exs b/lib/elixir/test/elixir/supervisor_test.exs
index 2c73a05f8..0bccbc031 100644
--- a/lib/elixir/test/elixir/supervisor_test.exs
+++ b/lib/elixir/test/elixir/supervisor_test.exs
@@ -51,8 +51,7 @@ defmodule SupervisorTest do
 
     wait_until_registered(:dyn_stack)
     assert GenServer.call(:dyn_stack, :pop) == :hello
-
-    Process.exit(pid, :normal)
+    Supervisor.stop(pid)
   end
 
   test "start_link/3" do
@@ -60,7 +59,7 @@ defmodule SupervisorTest do
     wait_until_registered(:stack_sup)
 
     assert GenServer.call(:stat_stack, :pop) == :hello
-    Process.exit(pid, :normal)
+    Supervisor.stop(pid)
   end
 
   test "*_child functions" do
@@ -86,8 +85,7 @@ defmodule SupervisorTest do
 
     assert Supervisor.terminate_child(pid, Stack) == :ok
     assert Supervisor.delete_child(pid, Stack) == :ok
-
-    Process.exit(pid, :normal)
+    Supervisor.stop(pid)
   end
 
   defp wait_until_registered(name) do
-- 
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