Read Before Written

static struct worker *g_worker;      /* starts NULL */

void init(void) {                    /* thread 1 */
    g_worker = worker_create(worker_main, NULL);
}

void worker_main(void *unused) {     /* thread 2, started inside worker_create */
    int state = g_worker->state;     /* crashes here */
    ...
}

The new thread occasionally dereferences NULL on its very first line. Which fix is correct?