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

// Copyright 2009 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.

// make a lot of goroutines, threaded together.

// tear them down cleanly.

package main

import (

        "os"

        "strconv"

)

func f(left, right chan int) {

        left <- <-right

}

func main() {

        var n = 10000

        if len(os.Args) > 1 {

                var err error

                n, err = strconv.Atoi(os.Args[1])

                if err != nil {

                        print("bad arg\n")

                        os.Exit(1)

                }

        }

        leftmost := make(chan int)

        right := leftmost

        left := leftmost

        for i := 0; i < n; i++ {

                right = make(chan int)

                go f(left, right)

                left = right

        }

        go func(c chan int) { c <- 1 }(right)

        <-leftmost

}