我目前正在处理多线程的生产者消费者问题。首先有1000个字节可用，使用RAM nad驱动程序已经占用了500个，让我使用500个线程。将有4个生产者，如下：
该程序旨在在安全更新完成后停止执行。理想情况下，这应该在不设置线程优先级的情况下实现。它工作得比较早，但现在当我运行程序时，安全线程正在中间完成，而spotify正在完成笑声。是否有任何错误可能导致这种情况？我在下面提供了我的代码。我还没有将所有字节大小分配给线程和缓冲区。
我的主要方法。
/**
* Created by User on 10/08/2014.
*/
public class ProducerConsumerTest {
public static void main(String[] args) throws InterruptedException {
Buffer c = new Buffer();
BubbleWitch2 p1 = new BubbleWitch2(c, 1);
Processor c1 = new Processor(c, 2);
Spotify p2 = new Spotify(c, 3);
SystemManagement p3 = new SystemManagement(c,4);
securityUpdate p4 = new securityUpdate(c,5, p1,p2,p3);
p1.setName("BubbleWitch2 ");
p2.setName("Spotify ");
p3.setName("System Management ");
p4.setName("Security Update ");
c1.start();
p1.start();
p2.start();
p3.start();
p4.start();
p2.join();
p3.join();
p4.join();
System.exit(0);
}
}
我的缓冲区/小班级
/**
* Created by User on 10/08/2014.
*/
class Buffer {
private int contents;
private boolean available = false;
public synchronized int get() {
while (available == false) {
try {
wait();
}
catch (InterruptedException e) {
}
}
available = false;
notifyAll();
return contents;
}
public synchronized void put(int value) {
while (available == true) {
try {
wait();
}
catch (InterruptedException e) {
}
}
contents = value;
available = true;
notifyAll();
}
}
我的消费者类
class Processor extends Thread {
private Buffer cubbyhole;
private int number;
public Processor(Buffer c, int number) {
cubbyhole = c;
this.number = number;
}
public void run() {
int value = 0;
for (int i = 0; i < 60; i++) {
value = cubbyhole.get();
System.out.println("Processor #"
+ this.number
+ " got: " + value);
}
}
}
我的spotify生产者类
class Spotify extends Thread {
private Buffer buffer;
private int number;
private int bytes;
public Spotify(Buffer c, int number) {
buffer = c;
this.number = number;
}
public void run() {
for (int i = 0; i < 20; i++) {
buffer.put(i);
System.out.println(getName() + this.number
+ " put: " + i);
try {
sleep(1000);
} catch (InterruptedException e) { }
}
System.out.println("*****************************");
System.out.println("Spotify has finished executing.");
System.out.println("*****************************");
}
}
我的bubblewitch制作类
import java.lang.*;
import java.lang.System;
/**
* Created by User on 10/08/2014.
*/
class BubbleWitch2 extends Thread {
private Buffer buffer;
private int number;
private int bytes;
public BubbleWitch2(Buffer c, int number) {
buffer = c;
this.number = number;
}
public void run() {
for (int i = 0; i < 10; i++) {
buffer.put(i);
System.out.println(getName() + this.number
+ " put: " + i);
try {
sleep(1000);
} catch (InterruptedException e) { }
}
System.out.println("*****************************");
System.out.println("BubbleWitch2 has finished executing.");
System.out.println("*****************************");
}
}
我的系统管理生产者类
class SystemManagement extends Thread {
private Buffer buffer;
private int number, min = 1, max = 15;
private int loopCount = (int) (Math.random() * ( max - min ));
public SystemManagement(Buffer c, int number) {
buffer = c;
this.number = number;
}
public void run() {
for (int i = 0; i < loopCount; i++) {
buffer.put(i);
System.out.println(getName() + this.number
+ " put: " + i);
try {
sleep(1000);
} catch (InterruptedException e) { }
}
System.out.println("*****************************");
System.out.println("System Management has finished executing.");
System.out.println("*****************************");
}
}
我的安全更新类
/**
* Created by User on 14/08/2014.
*/
import java.lang.*;
import java.lang.System;
/**
* Created by User on 11/08/2014.
*/
class securityUpdate extends Thread {
private Buffer buffer;
private int number;
private int bytes = 150;
private int process = 0;
public securityUpdate (Buffer c, int number, BubbleWitch2 bubbleWitch2, Spotify spotify, SystemManagement systemManagement) throws InterruptedException {
buffer = c;
this.number = number;
bubbleWitch2.join();
spotify.join();
systemManagement.join();
}
public void run() {
for (int i = 0; i < 10; i++) {
buffer.put(i);
System.out.println(getName() + this.number
+ " put: " + i);
try {
sleep(1000);
} catch (InterruptedException e) { }
}
System.out.println("*****************************");
System.out.println("Security Update has finished executing.");
System.out.println("*****************************");
}
}
我希望能够让它在最后运行而不需要在计数中硬编码不同的数字，因为我将需要在代码中计算以每秒150字节的速度运行2000字节的大小所需的时间，这将是使硬编码无关紧要。有没有人有任何想法？
答案 0 :(得分：2)
我不确定我是否完全理解这个问题，但你正在securityUpdate的构造函数中加入线程：
bubbleWitch2.join();
spotify.join();
systemManagement.join();
这些连接发生在线程启动之前，所以它们都是无操作。
同样，我在这里没有完全理解这个问题，但似乎你正试图让securityUpdate等待这三个线程完成。如果是这样，您可能希望将这些调用移至join()方法run()。
或类似的东西。祝你好运。
答案 1 :(得分：2)
使用更简单的执行器框架尝试以下修改后的代码： -
public class ProducerConsumerTest {
public static void main(String[] args) throws InterruptedException {
BlockingQueue<Integer> c = new ArrayBlockingQueue<Integer>(1);
CountDownLatch doneSignal = new CountDownLatch(3);
Processor c1 = new Processor(c, 2, doneSignal);
BubbleWitch2 p1 = new BubbleWitch2(c, 1, doneSignal);
Spotify p2 = new Spotify(c, 3, doneSignal);
SystemManagement p3 = new SystemManagement(c,4, doneSignal);
SecurityUpdate p4 = new SecurityUpdate(c,5, doneSignal);
p1.setName("BubbleWitch2 ");
p2.setName("Spotify ");
p3.setName("System Management ");
p4.setName("Security Update ");
ExecutorService exec = Executors.newCachedThreadPool();
exec.submit(c1);
exec.submit(p1);
exec.submit(p2);
exec.submit(p3);
Future<?> securityFuture = exec.submit(p4);
try {
while(securityFuture.get()!=null) {
}
exec.shutdown();
while(exec.awaitTermination(1000, TimeUnit.MILLISECONDS)) {
}
exec.shutdownNow();
} catch (ExecutionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.exit(0);
}
}
class Processor extends Thread {
private BlockingQueue<Integer> cubbyhole;
private int number;
private CountDownLatch doneSignal;
public Processor(BlockingQueue<Integer> c, int number,CountDownLatch doneSignal) {
cubbyhole = c;
this.number = number;
this.doneSignal = doneSignal;
}
public void run() {
int value = 0;
// for (int i = 0; i < 60; i++) {
while(true) {
try {
value = cubbyhole.take();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
//e.printStackTrace();
}
System.out.println("Processor #"
+ this.number
+ " got: " + value);
}
//doneSignal.countDown();
}
}
class Spotify extends Thread {
private BlockingQueue<Integer> buffer;
private int number;
private int bytes;
private CountDownLatch doneSignal;
public Spotify(BlockingQueue<Integer> c, int number, CountDownLatch doneSignal) {
buffer = c;
this.number = number;
this.doneSignal = doneSignal;
}
public void run() {
for (int i = 0; i < 20; i++) {
try {
buffer.put(i);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(getName() + this.number
+ " put: " + i);
}
System.out.println("*****************************");
System.out.println("Spotify has finished executing.");
System.out.println("*****************************");
doneSignal.countDown();
}
}
class BubbleWitch2 extends Thread {
private BlockingQueue<Integer> buffer;
private int number;
private int bytes;
private CountDownLatch doneSignal;
public BubbleWitch2(BlockingQueue<Integer> c, int number, CountDownLatch doneSignal) {
buffer = c;
this.number = number;
this.doneSignal = doneSignal;
}
public void run() {
for (int i = 0; i < 10; i++) {
try {
buffer.put(i);
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
System.out.println(getName() + this.number
+ " put: " + i);
}
System.out.println("*****************************");
System.out.println("BubbleWitch2 has finished executing.");
System.out.println("*****************************");
doneSignal.countDown();
}
}
class SystemManagement extends Thread {
private BlockingQueue<Integer> buffer;
private int number, min = 1, max = 15;
private int loopCount = (int) (Math.random() * ( max - min ));
private CountDownLatch doneSignal;
public SystemManagement(BlockingQueue<Integer> c, int number, CountDownLatch doneSignal) {
buffer = c;
this.number = number;
this.doneSignal = doneSignal;
}
public void run() {
for (int i = 0; i < loopCount; i++) {
try {
buffer.put(i);
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
System.out.println(getName() + this.number
+ " put: " + i);
}
System.out.println("*****************************");
System.out.println("System Management has finished executing.");
System.out.println("*****************************");
doneSignal.countDown();
}
}
class SecurityUpdate extends Thread {
private BlockingQueue<Integer> buffer;
private int number;
private int bytes = 150;
private int process = 0;
private CountDownLatch doneSignal;
public SecurityUpdate (BlockingQueue<Integer> c, int number, CountDownLatch doneSignal) {
buffer = c;
this.number = number;
this.doneSignal = doneSignal;
}
public void run() {
try {
doneSignal.await();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
for (int i = 0; i < 10; i++) {
try {
buffer.put(i);
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
System.out.println(getName() + this.number
+ " put: " + i);
}
System.out.println("*****************************");
System.out.println("Security Update has finished executing.");
System.out.println("*****************************");
}
}
如果您有任何问题，请告诉我