6ac87aa5b3
These are delay primitives for lock2. If a mutex isn't immediately available, we can use procyield to tell the processor to wait for a moment, or osyield to allow the OS to run a different process or thread if one is waiting. We expect a processor-level yield to be faster than an os-level yield, and for both of them to be fast relative to entering a full sleep (via futexsleep or semasleep). Each architecture has its own way of hinting to the processor that it's in a spin-wait loop, so procyield presents an architecture-independent interface for use in lock_futex.go and lock_sema.go. Measure the (single-threaded) speed of these to confirm. For #68578 Change-Id: I90cd46ea553f2990395aceb048206285558c877e Reviewed-on: https://go-review.googlesource.com/c/go/+/601396 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com> |
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