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ProducerConsumer_synchronized_wrong.java
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73 lines (61 loc) · 1.94 KB
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package com.test.multithread;
public class ProducerConsumer_synchronized_wrong {
public static void main(String[] args) throws InterruptedException {
// TODO Auto-generated method stub
Producer producer = new Producer();
Consumer consumer = new Consumer();
Runnable produceTask = () -> {
for (int i = 0; i < 50; i++) {
producer.produce();
}
System.out.println("Done producing");
};
Runnable consumeTask = () -> {
for (int i = 0; i < 50; i++) {
consumer.consume();
}
System.out.println("Done consuming");
};
Thread consumerThread = new Thread(consumeTask);
Thread producerThread = new Thread(produceTask);
consumerThread.start();
producerThread.start();
consumerThread.join();
producerThread.join();
System.out.println("Remaining task is " + count);
}
static int count = 0;
static int[] buffer = new int[10];
static Object lock = new Object();
static class Producer {
public void produce() {
synchronized (lock) {
while (isFull(buffer)) {
System.out.println("Buffer is full");
}
buffer[count++] = 1;
}
}
}
/*
* as we have while(isEmpty(buffer)) here,
* the key of the lock will not be release.
* And Producer is not able to produce.
*/
static class Consumer {
public void consume() {
synchronized (lock) {
while (isEmpty(buffer)) {
System.out.println("Buffer is empty");
}
buffer[--count] = 0;
}
}
}
public static boolean isFull(int[] buffer2) {
return count == buffer2.length;
}
public static boolean isEmpty(int[] buffer2) {
return count == 0;
}
}