18c2033ba5
The "block" helpers in TestBlockProfile previously slept for an arbitrary duration and assumed that that duration was long enough for the parent goroutine to have registered as blocking. However — especially on slow or overloaded builders — the current arbitrary duration is sometimes not quite long enough. Rather than increasing the duration to a different arbitrary value (which would make the test slower but not actually eliminate the possibility of flakes!), we can use the runtime's own accounting to detect when the goroutine is actually blocked: we obtain a goroutine dump from the runtime, and assume that blocking has been registered in the profile only if the runtime shows the test goroutine in the appropriate blocked state. That not only makes the test more reliable, but also makes it significantly lower-latency when run on a fast machine. Fixes #6999 Fixes #37844 Change-Id: I465ed2afd406fd2b621419e1f06925f283525f25 Reviewed-on: https://go-review.googlesource.com/c/go/+/384534 Trust: Bryan Mills <bcmills@google.com> Trust: Benny Siegert <bsiegert@gmail.com> Run-TryBot: Bryan Mills <bcmills@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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