In DPPX,a protective measure to prevent deadlocks between threads requesting locks. The locks are granted in lowest to highest order,based on their location in the hierarchy.

• 在分布式处理程序的执行程序（DPPX）中，一种防止请求封锁的各线程之间发生死锁的保护措施。这些锁根据它们所处的层次位置被授予从低到高的次序。