同步意味着两个部分：对象锁（object locking）和线程守候、激活(thread wait rather thanify)。对象锁助理副理线程可能不受其他线程的干扰。
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The current version of Walrus offers inconsistent data and no object locking.
Walrus现有版本不提供一致数据和对象锁定。
File object locking is not available, but the modified block storage technique can be introduced here the way we did in this article to maintain data consistency.
文件对象锁定不可用，但已修改的块存储技术可在此引入，按照本文介绍的方式保持数据一致性。
However, the constructor for this object has not run yet, which is precisely the situation that breaks double-checked locking.
然而，此对象的构造函数尚未运行，这恰是破坏双重检查锁定的情况。
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