AbstractQueuedSynchronizer（四）——tryAcquireNanos/doAcquireNanos方法

最新推荐文章于 2024-04-09 05:24:04 发布

xxcupid

最新推荐文章于 2024-04-09 05:24:04 发布

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分类专栏： java

本文链接：https://blog.youkuaiyun.com/xxcupid/article/details/51892141

本文详细探讨了AbstractQueuedSynchronizer（AQS）中的tryAcquireNanos和doAcquireNanos方法。这两个方法利用LockSupport.parkNanos进行定时等待，根据剩余超时时间进行park，并在超时或获取锁成功时unpark。文章重点分析了原理，包括如何处理超时和防止短时间park，以及返回值的含义。

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 /**
     * Attempts to acquire in exclusive mode, aborting if interrupted,
     * and failing if the given timeout elapses.  Implemented by first
     * checking interrupt status, then invoking at least once {@link
     * #tryAcquire}, returning on success.  Otherwise, the thread is
     * queued, possibly repeatedly blocking and unblocking, invoking
     * {@link #tryAcquire} until success or the thread is interrupted
     * or the timeout elapses.  This method can be used to implement
     * method {@link Lock#tryLock(long, TimeUnit)}.
     *
     * @param arg the acquire argument.  This value is conveyed to
     *        {@link #tryAcquire} but is otherwise uninterpreted and
     *        can represent anything you like.
     * @param nanosTimeout the maximum number of nanoseconds to wait
     * @return {@code true} if acquired; {@code false} if timed out
     * @throws InterruptedException if the current thread is interrupted
     */
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