CODEWITHSUNDEEP
javamultithreading
Nahum
Nahum

Reputation: 7197

how to synchronize part of method on different threads

Let us assume we have a method:

public class DoStuff implements Runnable {
    public void run()
    {
        A();
        B();
        C();
    }
}

Is there a simple way to create n threads that will run all A(), then all B(), then all C()?

I know that I can do something like:

    ExecutorService app = Executors.newFixedThreadPool(threadCount);

    //create A class and run A();

    app.shutdown();

    app.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS);

For A() then B() then C(), but I want something like the following:

public class DoStuff implements Runnable {
    public void run()
    {
        A();
        //wait all A to finish;
        B();
        //wait all B to finish;
        C();
    }
}

Using the same threads all the time.

Upvotes: 2

Views: 86

Answers (2)

Christopher Oezbek
Christopher Oezbek

Reputation: 26313

You are looking for CyclicBarrier

https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/CyclicBarrier.html

Upvotes: 4

Pavan Kumar K
Pavan Kumar K

Reputation: 1376

you need to make A, B and C as threads and you need to join them. Join A with B and B with C.

In this way you are making B thread to wait until A's job is done and C thread to wait until B's job is done.

Upvotes: -1

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