1. 简介
为构建锁和同步器提供基本的线程阻塞唤醒原语，LockSupport中的park()和unpark()的作用分别是阻塞线程和解除阻塞线程。类似于wait和notify，类似于await和signal。
2. 使用示例
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
public static void main(String[] args)
{
Thread t1 = new Thread(() -> {
try {
TimeUnit.SECONDS.sleep(3);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName() + "\t ----come in"+System.currentTimeMillis());
LockSupport.park();
System.out.println(Thread.currentThread().getName() + "\t ----被唤醒"+System.currentTimeMillis());}, "t1");
t1.start();
new Thread(() -> {
LockSupport.unpark(t1);
System.out.println(Thread.currentThread().getName()+"\t ----发出通知");
},"t2").start();
}
private static void lockAwaitSignal()
{
Lock lock = new ReentrantLock();
Condition condition = lock.newCondition();
new Thread(() -> {
try {
TimeUnit.SECONDS.sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
lock.lock();
try
{
System.out.println(Thread.currentThread().getName()+"\t ----come in");
condition.await();
System.out.println(Thread.currentThread().getName()+"\t ----被唤醒");
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
lock.unlock();
}},"t1").start();
new Thread(() -> {
lock.lock();
try
{
condition.signal();
System.out.println(Thread.currentThread().getName()+"\t ----发出通知");
}finally {
lock.unlock();
}},"t2").start();
}
private static void syncWaitNotify()
{
Object objectLock = new Object();
new Thread(() -> {
try {
TimeUnit.SECONDS.sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
synchronized (objectLock){
System.out.println(Thread.currentThread().getName()+"\t ----come in");
try {
objectLock.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName()+"\t ----被唤醒");
}},"t1").start();
new Thread(() -> {
synchronized (objectLock){
objectLock.notify();
System.out.println(Thread.currentThread().getName()+"\t ----发出通知");
}},"t2").start();
}
|
3. 源码解析