mirror of
https://github.com/golang/go
synced 2024-11-18 16:24:42 -07:00
42 lines
765 B
Go
42 lines
765 B
Go
// $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(sys.Args) > 1 {
|
|
var err *os.Error;
|
|
n, err = strconv.Atoi(sys.Args[1]);
|
|
if err != nil {
|
|
print("bad arg\n");
|
|
sys.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;
|
|
}
|