class ActionView::Template

def compile!(view) #:nodoc:
  return if @compiled
  # Templates can be used concurrently in threaded environments
  # so compilation and any instance variable modification must
  # be synchronized
  @compile_mutex.synchronize do
    # Any thread holding this lock will be compiling the template needed
    # by the threads waiting. So re-check the @compiled flag to avoid
    # re-compilation
    return if @compiled
    if view.is_a?(ActionView::CompiledTemplates)
      mod = ActionView::CompiledTemplates
    else
      mod = view.singleton_class
    end
    instrument("!compile_template") do
      compile(mod)
    end
    # Just discard the source if we have a virtual path. This
    # means we can get the template back.
    @source = nil if @virtual_path
    @compiled = true
  end
end