b89b4623eb
This implements preemptM on Windows using SuspendThead and ResumeThread. Unlike on POSIX platforms, preemptM on Windows happens synchronously. This means we need a make a few other tweaks to suspendG: 1. We need to CAS the G back to _Grunning before doing the preemptM, or there's a good chance we'll just catch the G spinning on its status in the runtime, which won't be preemptible. 2. We need to rate-limit preemptM attempts. Otherwise, if the first attempt catches the G at a non-preemptible point, the busy loop in suspendG may hammer it so hard that it never makes it past that non-preemptible point. Updates #10958, #24543. Change-Id: Ie53b098811096f7e45d864afd292dc9e999ce226 Reviewed-on: https://go-review.googlesource.com/c/go/+/204340 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com> |
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