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go/test/chan/goroutines.go
Russ Cox 360962420c casify, cleanup sys
R=r
OCL=22978
CL=22984
2009-01-16 14:58:14 -08:00

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;
}