Computing with Data

elgeish

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Previous: Reentrant Locks - Part I Next: Reentrant Locks - Part III

Reentrant Locks - Part II

We may use a binary semaphore to implement a lock for mutual exclusion as in the following code snippet:

import java.util.concurrent.Semaphore;
class ReentrantLockExample {
  private final Semaphore lock = new Semaphore(1);
  
  public void foo() throws InterruptedException {
    lock.acquire();
    try {
      // ...
      bar();
    } finally {
      lock.release();
    }
  }
  
  public void bar() throws InterruptedException {
    lock.acquire();
    try {
      // ...
    } finally {
      lock.release();
    }
  }
}
public class Main {
  public static void main(String args[]) throws Exception {
    new ReentrantLockExample().foo();
  }
}

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248/300 Reentrant Locks - Part II

Reentrant Locks - Part II

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