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Go has two answers. The first is cooperative preemption: the compiler inserts a small check at the beginning of most functions that tests whether the goroutine has been asked to yield. When the runtime wants to preempt a goroutine, it flips a flag, and the next function call triggers the check and hands control back to the scheduler. This is cheap — it reuses the stack growth check that’s already there — but it only works at function calls.