How do I implement a thread-safe stack in my application?

How do I implement a thread-safe stack in my application?

To implement a thread-safe stack, you can use synchronization mechanisms like mutexes or locks to manage access.

Can you show me a code example using Python?

Sure! Here's a simple implementation using threading and a lock:

import threading

class ThreadSafeStack:
    def __init__(self):
        self.stack = []
        self.lock = threading.Lock()

    def push(self, item):
        with self.lock:
            self.stack.append(item)

    def pop(self):
        with self.lock:
            if not self.is_empty():
                return self.stack.pop()
            return None

    def is_empty(self):
        with self.lock:
            return len(self.stack) == 0

What if I want to implement it in Java instead?

In Java, you can use the synchronized keyword or ReentrantLock. Here's a simple example:

import java.util.Stack;
import java.util.concurrent.locks.ReentrantLock;

public class ThreadSafeStack<T> {
    private Stack<T> stack = new Stack<>();
    private ReentrantLock lock = new ReentrantLock();

    public void push(T item) {
        lock.lock();
        try {
            stack.push(item);
        } finally {
            lock.unlock();
        }
    }

    public T pop() {
        lock.lock();
        try {
            return stack.isEmpty() ? null : stack.pop();
        } finally {
            lock.unlock();
        }
    }

    public boolean isEmpty() {
        lock.lock();
        try {
            return stack.isEmpty();
        } finally {
            lock.unlock();
        }
    }
}

Are there any performance considerations I should be aware of?

Yes, using locks can introduce contention, which may affect performance. Consider using concurrent data structures or minimizing lock duration.