正确做法： 用 java.util.concurrent.locks.ReentrantLock 代替 synchronized，因为 Lock 的等待可以被 JVM 处理为可卸载。
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"At a time where platforms seem to be rushing to implement end-to-end encryption whatever the implications, the conscious choice to step back from this on safety grounds is an important precedent," said Dan Sexton, the IWF's chief technology officer.