java – 条件 – 应该在等待之前解锁？

发布时间：2020-12-15 00:27:04 所属栏目：Java 来源：网络整理

导读：你能不能告诉我是否应该在等待条件之前释放锁？ try { lock.lock(); while (isNotEmpty()) { condition.await(); }} finally { lock.unlock();} 要么 try { lock.lock(); while (isNotEmpty()) { lock.unlock(); condition.await(); }} finally { lock.unloc

你能不能告诉我是否应该在等待条件之前释放锁？

try {
    lock.lock();
    while (isNotEmpty()) {
        condition.await();
    }
} finally {
    lock.unlock();
}

要么

try {
    lock.lock();
    while (isNotEmpty()) {
        lock.unlock();
        condition.await();
    }
} finally {
    lock.unlock();
}

解决方法

不,您不需要显式释放锁,等待将自动释放.从 javadoc：

The lock associated with this Condition is atomically released and the
current thread becomes disabled for thread scheduling purposes[…]

和：

The current thread is assumed to hold the lock associated with this Condition when this method is called.

（编辑：李大同）

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