pthread function from a class

Question

Let\'s say I have a class such as

class c { 
    // ...
    void *print(void *){ cout << \"Hello\"; }
}

And then I have a vector of c

Answer 1

You'll have to give pthread_create a function that matches the signature it's looking for. What you're passing won't work.

You can implement whatever static function you like to do this, and it can reference an instance of c and execute what you want in the thread. pthread_create is designed to take not only a function pointer, but a pointer to "context". In this case you just pass it a pointer to an instance of c.

For instance:

static void* execute_print(void* ctx) {
    c* cptr = (c*)ctx;
    cptr->print();
    return NULL;
}


void func() {

    ...

    pthread_create(&t1, NULL, execute_print, &c[0]);

    ...
}