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On Sunday, 12 June 2022 at 23:37:10 UTC+1 spitzak wrote:
Modern ones I think use (small) per-thread heaps. The problem then is that allocating and freeing in different threads loses the multithreading advantage of this and may result in locking anyway.
OK, that's interesting. I haven't looked at this aspect in a good while so had no idea what was really being done in practice now. I can see a per-thread heap being quite a neat way to duck the issue and that probably covers the majority of typical use cases.
But in this specific case, allocating in one thread then freeing in a different thread, it does seem like that will lead to some sort of synchronization, so I guess a lock does seem likely then. Which is a pity, as there are ways this could be made fully lock-free; though I admit they would probably be unnecessarily complex for the vast majority of cases!
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