Don't go on vacation while holding exclusive locks on files.
对文件进行锁定之后不要跑去休假。
These locks are converted to exclusive locks while performing the actual update.
在执行实际更新时，这些锁定被转换为独占锁定。
By this replication scheme, either the lock-holder or the next applicant can unlock the corresponding exclusive locks.
双钥锁允许加锁者或下一个申请者释放互斥锁。
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