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runtime: fix race condition between GC and setGCPercent

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If first GC runs concurrently with setGCPercent,
it can overwrite gcpercent value with default.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/10242047
This commit is contained in:
Dmitriy Vyukov 2013-06-15 16:07:06 +04:00
parent 4bb491b12e
commit 94dc963b55
1 changed files with 4 additions and 1 deletions
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5
src/pkg/runtime/mgc0.c
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@ -1974,7 +1974,10 @@ runtime·gc(int32 force)
return;
if(gcpercent == GcpercentUnknown) { // first time through
gcpercent = readgogc();
runtime·lock(&runtime·mheap);
if(gcpercent == GcpercentUnknown)
gcpercent = readgogc();
runtime·unlock(&runtime·mheap);
p = runtime·getenv("GOGCTRACE");
if(p != nil)