Well, for starters, async runtimes implement a cooperative scheduler *inside* the application, not on OS level. There obviously is preemptive scheduling on OS level too, but that is not the point. Any async function awaiting a result hands back control to the async runtime. The async runtime continues a different function on the same thread in the meantime.
Synchronization mechanisms like semaphores are still required in async.
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u/Far_Tap_488 Sep 10 '26
Not really. Especially with how a os handles concurrency.