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// $G $D/$F.go && $L $F.$A && ./$A.out

// 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.

// Check 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 := memstats.HeapObjects - st.HeapObjects

        if obj > N/5 {

                fmt.Println("too many objects left:", obj)

                os.Exit(1)

        }

}