CODEWITHSUNDEEP
javaandroidmultithreadingthread-safety
opc0de
opc0de

Reputation: 11768

Only one instance of a thread

I have some runnable code that is executed through a thread.The thread is executed by multiple pieces of code how can I make sure there is only one thread that executes that runnable at a certain point.

I tried using a boolean value that is true on thread start and becomes false at thread end but that didn't help.

Any ideas?

Upvotes: 2

Views: 3539

Answers (2)

Madushan
Madushan

Reputation: 7458

private class MyThread extends Thread
{
    private static Lock lock = new ReentrantLock();

    public void run()
    {
        if (MyThread.lock.tryLock())
        {
            try
            {
                // TODO something
            }
            finally
            {
                MyThread.lock.unlock();
            }
        }
    }
}

Upvotes: 2

Kumar Vivek Mitra
Kumar Vivek Mitra

Reputation: 33534

- First of all its the resources of an object that multiple threads access.

- Now if you want to let only 1 thread access that resource at an instance of time, then you can do the followings*:*

1. Use java.util.concurrent.Semaphore with number of thread equals 1, so only 1 thread at an time instance can access that resource.

Eg:

Semaphore s = new Semaphore(1);

2. You can also use SingleThreadExecutor, as it completes one task before going on the the second on and and so on. So there is No need of using synchronization.

Upvotes: 3

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