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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
}