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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.
package main
const N = 1000; // sent messages
const M = 10; // receiving goroutines
const W = 2; // channel buffering
var h [N]int; // marking of send/recv
func
r(c chan int, m int)
{
for {
select {
case r := <- c:
if h[r] != 1 {
panicln("r",
"m=", m,
"r=", r,
"h=", h[r]
);
}
h[r] = 2;
}
}
}
func
s(c chan int)
{
for n:=0; n<N; n++ {
r := n;
if h[r] != 0 {
panicln("s");
}
h[r] = 1;
c <- r;
}
}
func
main()
{
c := make(chan int, W);
for m:=0; m<M; m++ {
go r(c, m);
sys.Gosched();
}
sys.Gosched();
sys.Gosched();
s(c);
}
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