Doubt with the update rule in upsert function

[k3yavi]

Hi, check the following piece of code from here.

struct TGValue {
std::atomic<uint64_t> count{0};
};

auto upfn = [](TGValue& x) -> void {
    // update the count
    x.count++;
};

TGValue v(1);
<cuckoo_object>.upsert(<key_object>, upfn, v);

My confusion is do I have to define the count variable as atomic type or a normal int would do, if I want to get the correct count for the frequency of the upsert function call. Basically, if the order of the upsert function call doesn't matter to me then does the .upsert function serialize the update/initialization(you can imagine two initialization call concurrently) call to avoid race condition inside the TGValue object? It's not very clear from the documentation.

[manugoyal]

Yes. Access to all data inside the table is serialized, as each item is protected by a mutex. So a normal int should suffice.

[k3yavi]

Thanks @manugoyal !