#include <pthread.h>

    //this is our lock and we use it to lock and unlock our mutex when shared data is accessed.
    pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER

    //the signature of the thread function always looks like this.
    void* thread_function(void* arg)
    {

    //before accessing the shared resource

    pthread_mutex_lock(&lock);

    //do something access your shared resource

    pthread_mutex_unlock(&lock);

    pthread_exit(NULL);

    }

    //creating and calling threads

    int main()
    {

    pthread_t threads[3];
    pthread_create(threads[0], NULL, &thread_function, void *arg);
    pthread_create(threads[1], NULL, &thread_function, void *arg);
    pthread_create(threads[2], NULL, &thread_function, void *arg);

    //join the threads, join call waits for all threads to finish
    int i;

    for(i = 0; i < 3; i++)
    {
    pthread_join(threads[i], NULL);
    }

    //after you are finish you should always destroy the thread
    pthread_mutex_destory(&lock);

    }

These are the basic commands to use Mutex Threads in C

Mutex Threads with C

c

C