Intent Locks: Used to establish a lock hierarchy.
意向锁：用于建立锁的层次结构。
The set of all such locking patterns forms a lock hierarchy.
所有此类锁定模式形成了一个锁层次结构。
The number of threads in the group should be no larger than the depth of the deepest lock hierarchy possible in the system.
组中线程的数量应该不大于系统中最深的锁层次结构的深度。
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