Computing with Data

elgeish

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Previous: Reader-Writer Locks - Part IV Next: Reentrant Locks - Part II

Reentrant Locks - Part I

This kind of locking is useful when one method acquires the lock and calls another that also acquires said lock; for example:

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
class ReentrantLockExample {
  private final Lock lock = new ReentrantLock();
  
  public void foo() {
    lock.lock();
    try {
      // ...
      bar();
    } finally {
      lock.unlock();
    }
  }
  
  public void bar() {
    lock.lock();
    try {
      // ...
    } finally {
      lock.unlock();
    }
  }
}
public class Main {
  public static void main(String args[]) throws Exception {
    new ReentrantLockExample().foo();
  }
}

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247/300 Reentrant Locks - Part I

Reentrant Locks - Part I

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