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msicode on 07/20/16

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Mutex Threads with C

/ Published in: C

These are the basic commands to use Mutex Threads in C

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#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);

}

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