CRYPTO_atomic_store
if (!CRYPTO_atomic_store(&md->neighborhoods[neigh_idx].entries[j].hash,
if (!CRYPTO_atomic_store(&md->neighborhoods[neigh_idx].entries[empty_idx].hash,
if (!CRYPTO_atomic_store(&h->md->neighborhoods[neigh_idx].entries[j].hash,
int CRYPTO_atomic_store(uint64_t *dst, uint64_t val, CRYPTO_RWLOCK *lock);