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Copy pathProdCon.java
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72 lines (58 loc) · 1.43 KB
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//listing 2
// An implementation of a producer and consumer
// that use semaphores to control synchronization.
import java.util.concurrent.Semaphore;
class Q {
int n;
// Start with consumer semaphore unavailable.
static Semaphore semCon = new Semaphore(0);
static Semaphore semProd = new Semaphore(1);
void get() {
try {
semCon.acquire();
} catch (InterruptedException e) {
System.out.println("InterruptedException caught");
}
System.out.println("Got: " + n);
semProd.release();
}
void put(int n) {
try {
semProd.acquire();
} catch (InterruptedException e) {
System.out.println("InterruptedException caught");
}
this.n = n;
System.out.println("Put: " + n);
semCon.release();
}
}
class Producer implements Runnable {
Q q;
Producer(Q q) {
this.q = q;
new Thread(this, "Producer").start();
}
public void run() {
for (int i = 0; i < 20; i++)
q.put(i);
}
}
class Consumer implements Runnable {
Q q;
Consumer(Q q) {
this.q = q;
new Thread(this, "Consumer").start();
}
public void run() {
for (int i = 0; i < 20; i++)
q.get();
}
}
class ProdCon {
public static void main(String args[]) {
Q q = new Q();
new Consumer(q);
new Producer(q);
}
}