使用内在锁时，您将在线程转储中获得“等待锁”，而使用java.util.concurrent中的锁时，将获得“停放以等待”。考虑以下示例：
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.reentrantlock;
public class LockTest {
final Lock lock = new reentrantlock(true);
synchronized void intrinsicLock() {
Thread th = new Thread(new Runnable() {
public void run() {
intrinsicLock();
}
}, "My thread");
th.start();
try {
th.join();
} catch (InterruptedException e) {
}
}
void reentrantlock() {
lock.lock();
Thread th = new Thread(new Runnable() {
public void run() {
reentrantlock();
}
}, "My thread");
th.start();
try {
th.join();
} catch (InterruptedException e) {
}
lock.unlock();
}
public static void main(String[] args) {
LockTest lockTest = new Locktest();
lockTest.intrinsicLock();
//lockTest.reentrantlock();
}
}
随着lockTest.intrinsicLock()您将获得以下线程转储：
"My thread" prio=10 tid=0x00007fffec015800 nid=0x1775 waiting for monitor entry [0x00007ffff15e5000]
java.lang.Thread.State: BLOCKED (on object monitor)
at LockTest.intrinsicLock(LockTest.java:9)
- waiting to lock <0x00000007d6a33b10> (a LockTest)
at LockTest$1.run(LockTest.java:11)
at java.lang.Thread.run(Thread.java:662)
同时lockTest.reentrantlock()产生：
"My thread" prio=10 tid=0x00007fffec082800 nid=0x17e8 waiting on condition [0x00007ffff14eb000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000007d6a33d30> (a java.util.concurrent.locks.reentrantlock$FairSync)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:156)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:811)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:842)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1178)
at java.util.concurrent.locks.reentrantlock$FairSync.lock(reentrantlock.java:201)
at java.util.concurrent.locks.reentrantlock.lock(reentrantlock.java:262)
at LockTest.reentrantlock(LockTest.java:22)
at LockTest$2.run(LockTest.java:25)
at java.lang.Thread.run(Thread.java:662)
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