Fix for thread-safety bug in ActiveRecord::ConnectionAdapters::ConnectionPool

gistfile1.rb

module ActiveRecord
  module ConnectionAdapters
    class ConnectionPool
      def release_connection_with_synchronization(with_id = current_connection_id)
        synchronize do
          release_connection_without_synchronization(with_id)
        end
      end
      alias_method_chain :release_connection, :synchronization

      def clear_stale_cached_connections_with_synchronization!
        synchronize do
          clear_stale_cached_connections_without_synchronization!
        end
      end
      alias_method_chain :clear_stale_cached_connections!, :synchronization
    end
  end
end