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runtime: don't use atomic store in noteclear on AIX

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In CL 163624 we added an atomic store in noteclear on AIX only.
In the discussion on issue #63384 we think we figured out that the
real problem was in the implementation of compare-and-swap on ppc64.
That is fixed by CL 533118, so the atomic store is no longer required.

For #30189
For #63384

Change-Id: I60f4f2fac75106f2bee51a8d9663259dcde2029c
Reviewed-on: https://go-review.googlesource.com/c/go/+/534517
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Joel Sing <joel@sing.id.au>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
This commit is contained in:
Ian Lance Taylor 2023-10-11 14:09:20 -07:00 committed by Gopher Robot
parent eb832afb23
commit a762ea17ec
1 changed files with 1 additions and 7 deletions
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8
src/runtime/lock_sema.go
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@ -130,13 +130,7 @@ func unlock2(l *mutex) {
// One-time notifications.
func noteclear(n *note) {
if GOOS == "aix" {
// On AIX, semaphores might not synchronize the memory in some
// rare cases. See issue #30189.
atomic.Storeuintptr(&n.key, 0)
} else {
n.key = 0
}
n.key = 0
}
func notewakeup(n *note) {