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SleepingBarber.java
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SleepingBarber.java
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import java.util.concurrent.*;
public class SleepingBarber extends Thread
{
public static Semaphore customers = new Semaphore(0);
public static Semaphore barber = new Semaphore(0);
public static Semaphore accessSeats = new Semaphore(1);
public static final int chairs = 5;
public static int freeSeats = chairs;
class Customer extends Thread
{
int id;
boolean notCut = true;
public Customer(int i)
{
id = i;
}
public void run()
{
while(notCut)
{
try
{
accessSeats.acquire();
if(freeSeats > 0)
{
System.out.println("Customer " + this.id + " just sat down");
freeSeats--;
customers.release();
accessSeats.release();
try
{
barber.acquire();
notCut = false;
this.get_haircut();
}
catch(InterruptedException ex) {}
}
else
{
System.out.println("There are no free seats. Customer " + this.id + " has left the barbersop");
accessSeats.release();
notCut = false;
}
}
catch(InterruptedException ex) {}
}
}
public void get_haircut()
{
System.out.println("Customer " + this.id + " is getting his hair cut");
try
{
sleep(5050);
}
catch(InterruptedException ex) {}
}
}
class Barber extends Thread
{
public void run()
{
while(true)
{
try
{
customers.acquire();
accessSeats.release();
freeSeats++;
barber.release();
accessSeats.release();
this.cutHair();
}
catch(InterruptedException ex) {}
}
}
public void cutHair()
{
System.out.println("The barber is cutting hair");
try
{
sleep(5000);
}
catch(InterruptedException ex) {}
}
}
public static void main(String args[])
{
SleepingBarber barberShop = new SleepingBarber();
barberShop.start();
}
public void run()
{
Barber giovanni = new Barber();
giovanni.start();
for(int i = 0; i < 16; i++)
{
Customer cust = new Customer(i);
cust.start();
try
{
sleep(2000);
}
catch(InterruptedException ex) {}
}
}
}