# Implement error_handler pattern for Erlang
# which is integrated with Elixir.ParallelCompiler
defmodule Elixir.ErrorHandler do
  @moduledoc false

  def undefined_function(module, fun, args) do
    ensure_loaded(module)
    Erlang.error_handler.undefined_function(module, fun, args)
  end

  def undefined_lambda(module, fun, args) do
    ensure_loaded(module)
    Erlang.error_handler.undefined_lambda(module, fun, args)
  end

  defp ensure_loaded(module) do
    case Code.ensure_loaded(module) do
    match: { :module, _ }
      []
    match: { :error, _ }
      parent = Process.get(:elixir_parent_compiler)
      parent <- { :waiting, Process.self, module }
      receive do
      match: { :release, parent }
        :ok
      end
    end
  end
end