How to achieve fine-grained concurrency control using ReentrantLock in Java?

ReentrantLock enables fine-grained concurrency control in Java by using the following steps: Create a ReentrantLock object and use the lock() and unlock() methods to lock and unlock the code segment that needs to be protected

Using ReentrantLock to achieve fine-grained concurrency control

Introduction

In multi-threaded programming, concurrency control is crucial to ensure Multiple threads can safely access shared resources. ReentrantLock in Java is a reentrant lock that allows us to implement fine-grained concurrency control and lock only specific parts of a specific resource.

Usage of ReentrantLock

To use ReentrantLock, you need to perform the following steps:

1. Create a ReentrantLock object:

   ReentrantLock lock = new ReentrantLock();

2. Use lock() and unlock() around the code section you want to protect. Method:

   lock.lock();
   // 受保护的代码
   lock.unlock();

Practical case: Concurrency counter

Consider a counter class that can be incremented by multiple threads:

class Counter {
    private int count;
    private ReentrantLock lock = new ReentrantLock();

    public void increment() {
        lock.lock();
        try {
            count++;
        } finally {
            lock.unlock();
        }
    }

    public int getCount() {
        return count;
    }
}

Other features

ReentrantLock also provides other features:

• Fair lock: Ensures that threads acquire locks in the order requested.
• Timeout: Allows a thread to wait for a lock after a specified time without being blocked.
• Interruptible: Allows a thread to be interrupted while waiting for a lock.

Advantages and Disadvantages

The advantages and disadvantages of using ReentrantLock are as follows:

Advantages:

• Achieve fine-grained concurrency control
• Avoid deadlock
• Provide various features

Disadvantages:

• Increase code complexity
• May cause performance overhead

Conclusion

ReentrantLock is an implementation of fine-grained concurrency control in Java valuable tool. Used correctly, it can help create safe and efficient multi-threaded applications.

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