Semaphore implementation exception
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Semaphore implementation exception
$begingroup$
I am not sure why below code is throwing exception. If I implement the
same code with synchronized at method level then there is no
exception, and it works fine. I think using object lock should also
not have any issue.enter code here
package practice;
public class CustomSemaphore
int count;
int capacity;
Object lock = new Object();
public CustomSemaphore(int capacity)
this.count = capacity;
public void acquire() throws InterruptedException
synchronized (lock)
while (count > capacity)
wait();
count++;
System.out.println(Thread.currentThread().getName() + " got lock and working now");
public void release()
synchronized (lock)
count--;
notify();
System.out.println("releasing resource now");
public static void main(String[] args) throws InterruptedException
final CustomSemaphore sem = new CustomSemaphore(1);
Runnable acquireTask = new Runnable()
@Override
public void run()
while (true)
try
sem.acquire();
System.out.println(" acquired lock" + Thread.currentThread().getName());
catch (InterruptedException e)
// TODO Auto-generated catch block
e.printStackTrace();
;
Thread acqThread = new Thread(acquireTask, "acquire");
Runnable releaseTask = new Runnable()
@Override
public void run()
while (true)
sem.release();
;
Thread releaseThread = new Thread(releaseTask, "release");
acqThread.start();
releaseThread.start();
acqThread.join();
releaseThread.join();
}
java multithreading concurrency
asked 2 mins ago
AKSAKS
1161
$endgroup$
add a comment |
$begingroup$
I am not sure why below code is throwing exception. If I implement the
same code with synchronized at method level then there is no
exception, and it works fine. I think using object lock should also
not have any issue.enter code here
package practice;
public class CustomSemaphore
int count;
int capacity;
Object lock = new Object();
public CustomSemaphore(int capacity)
this.count = capacity;
public void acquire() throws InterruptedException
synchronized (lock)
while (count > capacity)
wait();
count++;
System.out.println(Thread.currentThread().getName() + " got lock and working now");
public void release()
synchronized (lock)
count--;
notify();
System.out.println("releasing resource now");
public static void main(String[] args) throws InterruptedException
final CustomSemaphore sem = new CustomSemaphore(1);
Runnable acquireTask = new Runnable()
@Override
public void run()
while (true)
try
sem.acquire();
System.out.println(" acquired lock" + Thread.currentThread().getName());
catch (InterruptedException e)
// TODO Auto-generated catch block
e.printStackTrace();
;
Thread acqThread = new Thread(acquireTask, "acquire");
Runnable releaseTask = new Runnable()
@Override
public void run()
while (true)
sem.release();
;
Thread releaseThread = new Thread(releaseTask, "release");
acqThread.start();
releaseThread.start();
acqThread.join();
releaseThread.join();
}
java multithreading concurrency
asked 2 mins ago
AKSAKS
1161
$endgroup$
add a comment |
$begingroup$
I am not sure why below code is throwing exception. If I implement the
same code with synchronized at method level then there is no
exception, and it works fine. I think using object lock should also
not have any issue.enter code here
package practice;
public class CustomSemaphore
int count;
int capacity;
Object lock = new Object();
public CustomSemaphore(int capacity)
this.count = capacity;
public void acquire() throws InterruptedException
synchronized (lock)
while (count > capacity)
wait();
count++;
System.out.println(Thread.currentThread().getName() + " got lock and working now");
public void release()
synchronized (lock)
count--;
notify();
System.out.println("releasing resource now");
public static void main(String[] args) throws InterruptedException
final CustomSemaphore sem = new CustomSemaphore(1);
Runnable acquireTask = new Runnable()
@Override
public void run()
while (true)
try
sem.acquire();
System.out.println(" acquired lock" + Thread.currentThread().getName());
catch (InterruptedException e)
// TODO Auto-generated catch block
e.printStackTrace();
;
Thread acqThread = new Thread(acquireTask, "acquire");
Runnable releaseTask = new Runnable()
@Override
public void run()
while (true)
sem.release();
;
Thread releaseThread = new Thread(releaseTask, "release");
acqThread.start();
releaseThread.start();
acqThread.join();
releaseThread.join();
}
java multithreading concurrency
asked 2 mins ago
AKSAKS
1161
$endgroup$
I am not sure why below code is throwing exception. If I implement the
same code with synchronized at method level then there is no
exception, and it works fine. I think using object lock should also
not have any issue.enter code here
package practice;
public class CustomSemaphore
int count;
int capacity;
Object lock = new Object();
public CustomSemaphore(int capacity)
this.count = capacity;
public void acquire() throws InterruptedException
synchronized (lock)
while (count > capacity)
wait();
count++;
System.out.println(Thread.currentThread().getName() + " got lock and working now");
public void release()
synchronized (lock)
count--;
notify();
System.out.println("releasing resource now");
public static void main(String[] args) throws InterruptedException
final CustomSemaphore sem = new CustomSemaphore(1);
Runnable acquireTask = new Runnable()
@Override
public void run()
while (true)
try
sem.acquire();
System.out.println(" acquired lock" + Thread.currentThread().getName());
catch (InterruptedException e)
// TODO Auto-generated catch block
e.printStackTrace();
;
Thread acqThread = new Thread(acquireTask, "acquire");
Runnable releaseTask = new Runnable()
@Override
public void run()
while (true)
sem.release();
;
Thread releaseThread = new Thread(releaseTask, "release");
acqThread.start();
releaseThread.start();
acqThread.join();
releaseThread.join();
}
java multithreading concurrency
java multithreading concurrency
asked 2 mins ago
AKSAKS
1161
asked 2 mins ago
AKSAKS
1161
asked 2 mins ago
AKSAKS
1161
asked 2 mins ago
AKSAKS
1161
asked 2 mins ago
AKSAKS
1161
1161
add a comment |
add a comment |
0
active
oldest
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