The constructor for the file_lock class accepts the name of the file to be locked, and it's important to open the file before lock is invoked; otherwise, an exception will be thrown.

file_lock类的构造函数接受要锁定的文件的名称，一定要在调用lock之前打开文件；否则会抛出异常。

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The ReentrantLock class, which implements Lock, has the same concurrency and memory semantics as synchronized, but also adds features like lock polling, timed lock waits, and interruptible lock waits.

ReentrantLock 类实现了 Lock ，它拥有与 synchronized 相同的并发性和内存语义，但是添加了类似锁投票、定时锁等候和可中断锁等候的一些特性。

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Both threads will wait indefinitely for the lock on the other class loader, and so they become deadlocked.

两个线程都会无限期地等候另一个类装入器上的锁，所以它们就变成了死锁的。

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Despite the transitional period the All Blacks are going through following the departure of a host of players - including world-class performers like prop Carl Hayman, lock Chris Jack and centre Luke McAlister - the public perception is that the hosts' winning trend is likely to continue.

BBC: Reddan sets bar high for Ireland

And he hopes that the Republicans will join him on that path and achieve this -- take advantage of this opportunity and lock in a plan that would achieve significant deficit reduction, would protect the middle class, and would help our economy.

WHITEHOUSE: Press Briefing by Press Secretary Jay Carney,