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runtime: make a test more robust

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The issue is discovered during testing of a change to runtime.
Even if it is unlikely to happen, the comment can safe an hour
next person who hits it.

LGTM=khr
R=golang-codereviews, khr
CC=golang-codereviews, rlh, rsc
https://golang.org/cl/116790043
This commit is contained in:
Dmitriy Vyukov 2014-07-15 10:30:12 +04:00
parent 8422d1ea65
commit 387c1c661f
1 changed files with 4 additions and 0 deletions
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4
src/pkg/runtime/proc_test.go
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@ -101,6 +101,10 @@ func TestGoroutineParallelism(t *testing.T) {
N = 3 N = 3
} }
defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(P)) defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(P))
// If runtime triggers a forced GC during this test then it will deadlock,
// since the goroutines can't be stopped/preempted.
// So give this test as much time as possible.
runtime.GC()
for try := 0; try < N; try++ { for try := 0; try < N; try++ {
done := make(chan bool) done := make(chan bool)
x := uint32(0) x := uint32(0)