ex2 w5

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>

#define MAX_MESSAGE_SIZE 256

struct Thread {
    pthread_t id;
    int i;
    char message[MAX_MESSAGE_SIZE];
};

void* thread_function(void* arg) {
    struct Thread* thread_data = (struct Thread*)arg;

    printf("Thread %d prints message: %s\n", thread_data->i, thread_data->message);

    // Exit the thread
    pthread_exit(NULL);
}

int main(int argc, char* argv[]) {
    if (argc != 2) {
        fprintf(stderr, "Usage: %s <number of threads>\n", argv[0]);
        return 1;
    }

    int n = atoi(argv[1]);

    if (n <= 0) {
        fprintf(stderr, "Number of threads must be a positive integer.\n");
        return 1;
    }

    struct Thread threads[n];

    // Create threads
    for (int i = 0; i < n; i++) {
        threads[i].i = i + 1;
        snprintf(threads[i].message, sizeof(threads[i].message), "Hello from thread %d", threads[i].i);

        printf("Thread %d is created\n", threads[i].i);

        if (pthread_create(&threads[i].id, NULL, thread_function, (void*)&threads[i]) != 0) {
            perror("pthread_create");
            return 1;
        }
    }

    // Wait for threads to finish
    for (int i = 0; i < n; i++) {
        pthread_join(threads[i].id, NULL);
    }

    return 0;
}