gistfile1.txt

#import <stdio.h>
#import <stdlib.h>
#import <pthread.h>
#import <unistd.h> // for sleep()

pthread_mutex_t printLock;

void* countdown(void* arg) {
    int id = *((int*)arg);
    for (int i = 5; i >= 1; i--) {
        pthread_mutex_lock(&printLock);
        printf("Thread %d: %d\n", id, i);
        pthread_mutex_unlock(&printLock);
        sleep(1); // simulate work
    }
    return NULL;
}

int main() {
    pthread_t t1, t2;
    int id1 = 1, id2 = 2;

    // Initialize mutex
    if (pthread_mutex_init(&printLock, NULL) != 0) {
        printf("Failed to initialize mutex\n");
        return 1;
    }

    printf("Starting threads...\n");

    pthread_create(&t1, NULL, countdown, &id1);
    pthread_create(&t2, NULL, countdown, &id2);

    pthread_join(t1, NULL);
    pthread_join(t2, NULL);

    pthread_mutex_destroy(&printLock);

    printf("All threads completed.\n");
    return 0;
}