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-rw-r--r--test/gc2.go45
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diff --git a/test/gc2.go b/test/gc2.go
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+// +build !nacl,!js
+// run
+
+// Copyright 2011 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.
+
+// Test that buffered channels are garbage collected properly.
+// An interesting case because they have finalizers and used to
+// have self loops that kept them from being collected.
+// (Cyclic data with finalizers is never finalized, nor collected.)
+
+package main
+
+import (
+ "fmt"
+ "os"
+ "runtime"
+)
+
+func main() {
+ const N = 10000
+ st := new(runtime.MemStats)
+ memstats := new(runtime.MemStats)
+ runtime.ReadMemStats(st)
+ for i := 0; i < N; i++ {
+ c := make(chan int, 10)
+ _ = c
+ if i%100 == 0 {
+ for j := 0; j < 4; j++ {
+ runtime.GC()
+ runtime.Gosched()
+ runtime.GC()
+ runtime.Gosched()
+ }
+ }
+ }
+
+ runtime.ReadMemStats(memstats)
+ obj := int64(memstats.HeapObjects - st.HeapObjects)
+ if obj > N/5 {
+ fmt.Println("too many objects left:", obj)
+ os.Exit(1)
+ }
+}