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test: make goprint.go wait for goroutine termination

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Test goprint.go sometimes failed on a slow builder (plan9_arm)
because of timing dependency.  Instead of sleeping for a fixed
time to allow the child goroutine to finish, wait explicitly for
child termination by calling runtime.NumGoroutine until the
returned value is 1.

Fixes #15097

Change-Id: Ib3ef5ec3c8277083c774542f48bcd4ff2f79efde
Reviewed-on: https://go-review.googlesource.com/21603
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Richard Miller 2016-04-06 18:42:14 +01:00 committed by Brad Fitzpatrick
parent 5176a4b39b
commit a25e368f44
1 changed files with 7 additions and 2 deletions
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9
test/goprint.go
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@ -8,9 +8,14 @@
package main
import "time"
import (
"runtime"
"time"
)
func main() {
go println(42, true, false, true, 1.5, "world", (chan int)(nil), []int(nil), (map[string]int)(nil), (func())(nil), byte(255))
time.Sleep(100*time.Millisecond)
for runtime.NumGoroutine() > 1 {
time.Sleep(10*time.Millisecond)
}
}