Imported Upstream version 60upstream/60

1 files changed, 48 insertions, 0 deletions

diff --git a/test/chan/select2.go b/test/chan/select2.go
new file mode 100644
index 000000000..e24c51ed1
--- /dev/null
+++ b/test/chan/select2.go
@@ -0,0 +1,48 @@
+// $G $D/$F.go && $L $F.$A && ./$A.out
+
+// Copyright 2010 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import "runtime"
+
+func sender(c chan int, n int) {
+	for i := 0; i < n; i++ {
+		c <- 1
+	}
+}
+
+func receiver(c, dummy chan int, n int) {
+	for i := 0; i < n; i++ {
+		select {
+		case <-c:
+			// nothing
+		case <-dummy:
+			panic("dummy")
+		}
+	}
+}
+
+func main() {
+	runtime.MemProfileRate = 0
+
+	c := make(chan int)
+	dummy := make(chan int)
+
+	// warm up
+	go sender(c, 100000)
+	receiver(c, dummy, 100000)
+	runtime.GC()
+	runtime.MemStats.Alloc = 0
+
+	// second time shouldn't increase footprint by much
+	go sender(c, 100000)
+	receiver(c, dummy, 100000)
+	runtime.GC()
+
+	if runtime.MemStats.Alloc > 1e5 {
+		println("BUG: too much memory for 100,000 selects:", runtime.MemStats.Alloc)
+	}
+}