How do semaphores work in multi-threading?

How do semaphores work in multi-threading?

Semaphores are synchronization tools that control access to shared resources in multi-threading. They help prevent race conditions.

Can you explain the difference between binary and counting semaphores?

Sure! A binary semaphore can only take values 0 or 1, while a counting semaphore can take any non-negative integer value.

When should I use a semaphore instead of a mutex?

Use a semaphore when you need to control access to a resource by multiple threads, while a mutex is for exclusive access.

Can you provide a code example of using a semaphore?

Certainly! Here's a simple example in Python using the threading module:

import threading

semaphore = threading.Semaphore(2)

def access_resource():
    with semaphore:
        print("Resource accessed")

This allows up to 2 threads to access the resource simultaneously.