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Preemption

Go Preempts Goroutines with a Signal: Asynchronous Preemption Since Go 1.14

Oct 21, 2026 16 min read Jay Hubbert

Go preempts goroutines cooperatively by poisoning the stack bound and asynchronously with SIGURG; the signal handler checks PCDATA_UnsafePoint before injecting a call to …

GoInternalsPreemptionSignalsConcurrency

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