lock_thread=

# File activerecord/lib/active_record/connection_adapters/abstract_adapter.rb, line 183
      def lock_thread=(lock_thread) # :nodoc:
        @lock =
        case lock_thread
        when Thread
          THREAD_LOCK
        when Fiber
          FIBER_LOCK
        else
          ActiveSupport::Concurrency::NullLock
        end
      end