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What purpose would locks and concurrent primitives have in a system where running code is not preempted?

• trhway 7y ago
  In addition to parallel in all senses/levels systems mentioned by the other commenter, another example would be a truely single threaded hardware with cooperative or even sequential multithreading where you'd use locking/etc. to safeguard your memory model invariants against for example compiler, JIT and hardware optimization shenanigans.
• StillBored 7y ago
  To guarantee two different threads don't try to simultaneously mutate (or in some cases access) shared resources.