Merge pull request #1 from google/master

catch up

1 files changed, 31 insertions, 0 deletions

diff --git a/pkg/sleep/sleep_test.go b/pkg/sleep/sleep_test.go
index 130806c86..af47e2ba1 100644
--- a/pkg/sleep/sleep_test.go
+++ b/pkg/sleep/sleep_test.go
@@ -376,6 +376,37 @@ func TestRace(t *testing.T) {
 	}
 }
 
+// TestRaceInOrder tests that multiple wakers can continuously send wake requests to
+// the sleeper and that the wakers are retrieved in the order asserted.
+func TestRaceInOrder(t *testing.T) {
+	const wakers = 100
+	const wakeRequests = 10000
+
+	w := make([]Waker, wakers)
+	s := Sleeper{}
+
+	// Associate each waker and start goroutines that will assert them.
+	for i := range w {
+		s.AddWaker(&w[i], i)
+	}
+	go func() {
+		n := 0
+		for n < wakeRequests {
+			wk := w[n%len(w)]
+			wk.Assert()
+			n++
+		}
+	}()
+
+	// Wait for all wake up notifications from all wakers.
+	for i := 0; i < wakeRequests; i++ {
+		v, _ := s.Fetch(true)
+		if got, want := v, i%wakers; got != want {
+			t.Fatalf("got  %d want %d", got, want)
+		}
+	}
+}
+
 // BenchmarkSleeperMultiSelect measures how long it takes to fetch a wake up
 // from 4 wakers when at least one is already asserted.
 func BenchmarkSleeperMultiSelect(b *testing.B) {