runtime: make a test more robust
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
diff --git a/src/pkg/runtime/proc_test.go b/src/pkg/runtime/proc_test.go
index 5be3551..1f597f5 100644
--- a/src/pkg/runtime/proc_test.go
+++ b/src/pkg/runtime/proc_test.go
@@ -101,6 +101,10 @@
N = 3
}
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++ {
done := make(chan bool)
x := uint32(0)
