How do I implement semaphores in my code?

How do I implement semaphores in my code?

To implement semaphores, you can use libraries like threading in Python. Would you like a code example?

Yes, please provide a code example using Python.

Here's a simple example:

import threading
import time

# Create a semaphore with a limit of 2
semaphore = threading.Semaphore(2)

def worker(num):
    print(f'Worker {num} is waiting to enter the critical section.')
    semaphore.acquire()
    print(f'Worker {num} has entered the critical section.')
    time.sleep(2)  # Simulate work
    print(f'Worker {num} is leaving the critical section.')
    semaphore.release()

# Create multiple threads
threads = []
for i in range(5):
    t = threading.Thread(target=worker, args=(i,))
    threads.append(t)
    t.start()

# Wait for all threads to complete
for t in threads:
    t.join()

What does the semaphore do in this example?

In this example, the semaphore allows up to 2 threads to enter the critical section at the same time, ensuring controlled access.