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runtime: fix writebarrier throw in lock_sema

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The value in question is really a bit pattern
(a pointer with extra bits thrown in),
so treat it as a uintptr instead, avoiding the
generation of a write barrier when there
might not be a p.

Also add the obligatory //go:nowritebarrier.

Change-Id: I4ea097945dd7093a140f4740bcadca3ce7191971
Reviewed-on: https://go-review.googlesource.com/7667
Reviewed-by: Rick Hudson <rlh@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Russ Cox 2015-03-17 15:07:05 -04:00
parent 41dbcc19ef
commit 87ec06f961
2 changed files with 5 additions and 3 deletions
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2
src/runtime/runtime2.go
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@ -301,7 +301,7 @@ type m struct {
freghi [16]uint32 // d[i] msb and f[i+16]
fflag uint32 // floating point compare flags
locked uint32 // tracking for lockosthread
nextwaitm *m // next m waiting for lock
nextwaitm uintptr // next m waiting for lock
waitsema uintptr // semaphore for parking on locks
waitsemacount uint32
waitsemalock uint32