这段代码实现不了死锁吗？该怎么解决
日期：2014-05-20 浏览次数：20870 次
这段代码实现不了死锁吗？
能sleep的地方都sleep了，就是不死锁，是不是什么地方有问题？
------解决方案--------------------
死锁是a占用b资源，b又占用a资源。先理解死锁的概念吧
- Java code
public class Deadlock {
private String a="";
private String b="";
private int n=1;
public void write(){
synchronized (a) {
try {
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
synchronized (b) {
System.out.println("第" +
n+"次被写入");
n++;
}
}
}
public void read(){
synchronized (b) {
try {
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
synchronized (a) {
System.out.println("第" +
n+"次被读取");
n++;
}
}
}
- Java code
public class MyDeadlock implements Runnable{
private Deadlock dl;
public MyDeadlock(Deadlock dl) {
this.dl = dl;
}
@Override
public void run() {
for(int i=0;i<100;i++){
dl.write();
dl.read();
}
}
- Java code
public class TestDeadlock {
public static void main(String[] args) {
Deadlock deadlock=new Deadlock();
MyDeadlock md=new MyDeadlock(deadlock);
Thread t1=new Thread(md);
Thread t2=new Thread(md);
t1.start();
try {
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
t2.start();
try {
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
能sleep的地方都sleep了，就是不死锁，是不是什么地方有问题？
------解决方案--------------------
死锁是a占用b资源，b又占用a资源。先理解死锁的概念吧
- Java code
package com.zzx.study.thread;
public class TestDeadLock implements Runnable {
public int flag = 1;
static Object o1 = new Object(), o2 = new Object();
public void run() {
System.out.println("flag=" + flag);
if(flag == 1) {
synchronized(o1) {
try {
Thread.sleep(500);
} catch (Exception e) {
e.printStackTrace();
}
synchronized(o2) {
System.out.println("1");
}
}
}
if(flag == 0) {
synchronized(o2) {
try {
Thread.sleep(500);
} catch (Exception e) {
e.printStackTrace();
}
synchronized(o1) {
System.out.println("0");
}
}
}
}
public static void main(String[] args) {
TestDeadLock td1 = new TestDeadLock();
TestDeadLock td2 = new TestDeadLock();
td1.flag = 1;
td2.flag = 0;
Thread t1 = new Thread(td1);
Thread t2 = new Thread(td2);
t1.start();
t2.start();
}
}
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