Problems when write to a array when reading it

Development Programming & Scripting
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I have implemented a sample ObjectPool in unreal engine, the core data like this structure: TMap<TSubClassOf, TTuple<Actor*, Actor*>> PooledActors.
The key is the object type, the value is a tuple which stored inactive and active actor’s pointer.

At runtime, I pulled actor from this pool and pushed to pool when I don’t need it. The Actor should implement OnPull/OnPush function to something like “SetHiddenInGame()”. Yeah, it is sample objectPool.

My question is what will happend if write to a pool when I am now reading it? This is very likely to happen for object pools. Should I need lock or something like that?

And I have done some google that somebody say: “if all logic happend on the same thread, you should not wrroy about it”.

  1. Is it correct?
  2. How to know if there will be multithreading?
  3. If the game thread for unreal engine is alway on single thread?
  4. If it is only on single thread, how is “FScopeLock” used in unreal engine’s source code?
  5. Can it solve all the problems by copying of the array for reading it?

Thanks for any reply!