How do I use semaphore in C++?

How do I use semaphore in C++?

To use semaphore in C++, you typically include the semaphore library and create a semaphore object. Would you like a code example?

Yes, please provide a code example.

Here's a simple example:

#include <semaphore.h>
#include <pthread.h>
#include <iostream>

sem_t semaphore;

void* threadFunction(void* arg) {
    sem_wait(&semaphore);
    // Critical section
    std::cout << "Thread is in critical section." << std::endl;
    sem_post(&semaphore);
    return nullptr;
}

int main() {
    sem_init(&semaphore, 0, 1);
    pthread_t thread1, thread2;
    pthread_create(&thread1, nullptr, threadFunction, nullptr);
    pthread_create(&thread2, nullptr, threadFunction, nullptr);
    pthread_join(thread1, nullptr);
    pthread_join(thread2, nullptr);
    sem_destroy(&semaphore);
    return 0;
}

This code initializes a semaphore and uses it to control access to a critical section.

What is the purpose of using a semaphore?

Semaphores are used to manage access to shared resources in concurrent programming, preventing race conditions.