# File lib/ruote/exp/fe_reserve.rb, line 108
    def release_mutex

      target, var = locate_var(h.mutex_name)

      mutex = target.variables[var]

      mutex.last.shift

      r = target.try_persist

      return release_mutex if r != nil

      next_fei = mutex.last.first

      Ruote::Exp::FlowExpression.fetch(@context, next_fei).enter if next_fei
    end