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// 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 := memstats.HeapObjects - st.HeapObjects
if obj > N/5 {
fmt.Println("too many objects left:", obj)
os.Exit(1)
}
}
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