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多线程之线程通信条件Condition二
接上一篇，实现Condition三个条件，有这样一个应用：
1、 有三个进程，第一个进程执行1次，第二个进程执行2次，第三个进程执行3次；
2、 先执行第二个进程，然后第一个，然后第三个；
3、 依次执行5次循环。
分析：
此时若用Object的wait和notify是实现不了的，我们可以用Lock锁的Condition实现，我们需要定义三个信号条件，分别控制这三个进程。
实现如下：
package andy.thread.test;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
/**
* @author Zhang,Tianyou
* @version 2014年11月9日 下午12:12:44
*/
public class ThreeThreadCondition {
static A tasks = new A();
public static void main(String[] args) {
// 2号线程
new Thread(new Runnable() {
@Override
public void run() {
for (int i = 1; i <= 5; i++) {
// 循环执行5次
tasks.sub2(i);
}
}
}).start();
// 3号线程
new Thread(new Runnable() {
@Override
public void run() {
for (int i = 1; i <= 5; i++) {
// 循环执行5次
tasks.sub3(i);
}
}
}).start();
// 主线程代替1号线程
for (int i = 1; i <= 5; i++) {
// 循环执行5次
tasks.sub1(i);
}
}
static class A {
Lock lock = new ReentrantLock();
Condition condition1 = lock.newCondition();
Condition condition2 = lock.newCondition();
Condition condition3 = lock.newCondition();
// 先执行2号线程
private int execuNum = 2;
public void sub2(int i) {
lock.lock();
try {
// 若不是2 则阻塞等待
while (execuNum != 2) {
try {
condition2.await();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
for (int j = 1; j <= 2; j++) {
System.out.println("sub2 thread sequence of " + j
+ ", task is " + i);
}
// 执行完 交给1线程
execuNum = 1;
condition1.signal();
} finally {
lock.unlock();
}
}
public void sub1(int i) {
lock.lock();
try {
// 若不是1则阻塞等待
while (execuNum != 1) {
try {
condition1.await();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
System.out.println("sub1 thread sequence of " + 1
+ ", task is " + i);
// 执行完 交给3线程
execuNum = 3;
condition3.signal();
} finally {
lock.unlock();
}
}
public void sub3(int i) {
lock.lock();
try {
// 若不是2 则阻塞等待
while (execuNum != 3) {
try {
condition3.await();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
for (int j = 1; j <= 3; j++) {
System.out.println("sub3 thread sequence of " + j
+ ", task is " + i);
}
// 执行完 交给1线程
execuNum = 2;
condition2.signal();
} finally {
lock.unlock();
}
}
}
}
sub2 thread sequence of 1, task is 1 sub2 thread sequence of 2, task is 1 sub1 thread sequence of 1, task is 1 sub3 thread sequence of 1, task is 1 sub3 thread sequence of 2, task is 1 sub3 thread sequence of 3, task is 1 sub2 thread sequence of 1, task is 2 sub2 thread sequence of 2, task is 2 sub1 thread sequence of 1, task is 2 sub3 thread sequence of 1, task is 2 sub3 thread sequence of 2, task is 2 sub3 thread sequence of 3, task is 2 sub2 thread sequence of 1, task is 3 sub2 thread sequence of 2, task is 3 sub1 thread sequence of 1, task is 3 sub3 thread sequence of 1, task is 3 sub3 thread sequence of 2, task is 3 sub3 thread sequence of 3, task is 3 sub2 thread sequence of 1, task is 4 sub2 thread sequence of 2, task is 4 sub1 thread sequence of 1, task is 4 sub3 thread sequence of 1, task is 4 sub3 thread sequence of 2, task is 4 sub3 thread sequence of 3, task is 4 sub2 thread sequence of 1, task is 5 sub2 thread sequence of 2, task is 5 sub1 thread sequence of 1, task is 5 sub3 thread sequence of 1, task is 5 sub3 thread sequence of 2, task is 5 sub3 thread sequence of 3, task is 5
多线程之线程通信条件Condition二
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