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// $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()

        memstats := new(runtime.MemStats)

        runtime.ReadMemStats(memstats)

        alloc := memstats.Alloc

        // second time shouldn't increase footprint by much

        go sender(c, 100000)

        receiver(c, dummy, 100000)

        runtime.GC()

        runtime.ReadMemStats(memstats)

        if memstats.Alloc-alloc > 1e5 {

                println("BUG: too much memory for 100,000 selects:", memstats.Alloc-alloc)

        }

}