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runtime: ensure _Grunning Gs have a valid g.m and g.m.p

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We already claim on the documentation for _Grunning that this is case,
but execute transitions to _Grunning before assigning g.m. Fix this
and make the documentation even more explicit.

For #10958, #24543, but also a good cleanup.

Change-Id: I1eb0108e7762f55cfb0282aca624af1c0a15fe56
Reviewed-on: https://go-review.googlesource.com/c/go/+/201440
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Austin Clements 2019-04-15 21:46:43 -04:00
parent f82956b85b
commit fc8eb264bb
2 changed files with 5 additions and 3 deletions
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2
src/runtime/runtime2.go
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@ -40,7 +40,7 @@ const (
// _Grunning means this goroutine may execute user code. The
// stack is owned by this goroutine. It is not on a run queue.
// It is assigned an M and a P.
// It is assigned an M and a P (g.m and g.m.p are valid).
_Grunning // 2
// _Gsyscall means this goroutine is executing a system call.