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ReaderWriterThreads
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ReaderWriterThreads
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package readerwriterthreads;
import java.util.concurrent.Semaphore;
class ReaderWriter implements Runnable {
int rc;
Semaphore S=new Semaphore(1);
Semaphore wrt=new Semaphore(2);
public void run()
{
try
{
S.acquire();
rc++;
if(rc==1)
wrt.acquire();
S.release();
System.out.println("reading started by"+Thread.currentThread().getName());
Thread.sleep(100);
System.out.println("Read finish by"+Thread.currentThread().getName());
S.acquire();
rc--;
if(rc==0)
wrt.release();
S.release();
}
catch(Exception e)
{
System.out.println("exception caught");
}
}
}
class Writer implements Runnable{
int rc;
Semaphore S=new Semaphore(1);
Semaphore wrt=new Semaphore(2);
public void run()
{
try{
wrt.acquire();
System.out.println("writing started by"+Thread.currentThread().getName());
Thread.sleep(5000);
System.out.println("write finish by"+Thread.currentThread().getName());
wrt.release();
}
catch(Exception e)
{
System.out.println("Exception caught");
}
}
}
public class ReaderWriterThreads {
int rc=0;
public static void main(String[] args) throws Exception{
while(true)
{
ReaderWriter r=new ReaderWriter();
Thread t1=new Thread(r);
Thread t2=new Thread(r);
Writer w=new Writer();
Thread t3=new Thread(w);
t1.setName("thread1");
t1.start();
t2.setName("thread2");
t2.start();
t3.setName("thread3");
t3.start();
}
}
}