如何使用ReentrantLock锁定？ [英] How to lock with ReentrantLock?
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问题描述
我希望以下测试只打印已被锁定一次。
然后它会打印该行。
I would expect the following test to only print "has been locked" once. BUT it consequently prints the line.
public class LocKTest {
@Test
public void testLock() {
Lock lock = new ReentrantLock();
while (true) {
if (lock.tryLock()) {
//lock.lock(); same result if I include an explicit lock here
System.out.println("has been locked");
}
}
}
}
As据我所知， tryLock 将锁定 ReentrantLock 如果可能（即如果尚未锁定）。但显然事实并非如此。
As far as I understood, tryLock will lock the ReentrantLock if possible (ie if not locked yet). But obviously this is not the case.
如何设置这样的锁线程安全？
How can I set such a lock threadsafe?
推荐答案
名称是 ReentrantLock ，这意味着如果你已经拥有锁，你可以重新输入 。
The name is ReentrantLock, meaning you can re-enter if you already own the lock.
如果你想拥有线程块，你可以使用例如信号量 1（或更多） ）许可证。
If you wish to have the thread block, you could use for example a Semaphore with 1 (or more) permits.
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