Imported Upstream version 2011-02-01.1upstream/2011-02-01.1

1 files changed, 9 insertions, 3 deletions

diff --git a/src/pkg/time/tick.go b/src/pkg/time/tick.go
index ddd727270..6c21bf19b 100644
--- a/src/pkg/time/tick.go
+++ b/src/pkg/time/tick.go
@@ -22,8 +22,12 @@ type Ticker struct {
 
 // Stop turns off a ticker.  After Stop, no more ticks will be sent.
 func (t *Ticker) Stop() {
-	// Make it non-blocking so multiple Stops don't block.
-	_ = t.shutdown <- true
+	select {
+	case t.shutdown <- true:
+		// ok
+	default:
+		// Stop in progress already
+	}
 }
 
 // Tick is a convenience wrapper for NewTicker providing access to the ticking
@@ -106,7 +110,8 @@ func tickerLoop() {
 			// that need it and determining the next wake time.
 			// TODO(r): list should be sorted in time order.
 			for t := tickers; t != nil; t = t.next {
-				if _, ok := <-t.shutdown; ok {
+				select {
+				case <-t.shutdown:
 					// Ticker is done; remove it from list.
 					if prev == nil {
 						tickers = t.next
@@ -114,6 +119,7 @@ func tickerLoop() {
 						prev.next = t.next
 					}
 					continue
+				default:
 				}
 				if t.nextTick <= now {
 					if len(t.c) == 0 {