use System.halt to avoid hangs on shutdown

Author: lukaszsamson

apps/debug_adapter/lib/debug_adapter/server.ex

@@ -208,7 +208,7 @@ defmodule ElixirLS.DebugAdapter.Server do
         Output.debugger_important("Terminating #{__MODULE__}: #{message}")
 
         unless :persistent_term.get(:debug_adapter_test_mode, false) do
-          System.stop(1)
+          System.halt(1)
         end
     end
 
@@ -655,7 +655,7 @@ defmodule ElixirLS.DebugAdapter.Server do
     unless :persistent_term.get(:debug_adapter_test_mode, false) do
       Output.debugger_console("Received disconnect request\n")
       Process.sleep(200)
-      System.stop(0)
+      System.halt(0)
     else
       Process.exit(self(), {:exit_code, 0})
     end

apps/language_server/lib/language_server/application.ex

@@ -46,6 +46,6 @@ defmodule ElixirLS.LanguageServer.Application do
 
   def restart() do
     Application.put_env(:language_server, :restart, true)
-    System.stop(0)
+    System.halt(0)
   end
 end

apps/language_server/lib/language_server/server.ex

@@ -551,7 +551,7 @@ defmodule ElixirLS.LanguageServer.Server do
     code = if state.received_shutdown?, do: 0, else: 1
 
     unless :persistent_term.get(:language_server_test_mode, false) do
-      System.stop(code)
+      System.halt(code)
     else
       Logger.info("Received exit with code #{code}")
     end