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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
var counter uint
var shift uint
func GetValue() uint {
counter++;
return 1 << shift
}
func Send(a, b chan uint) int {
var i int;
LOOP:
for {
select {
case a <- GetValue():
i++;
a = nil;
case b <- GetValue():
i++;
b = nil;
default:
break LOOP;
}
shift++;
}
return i;
}
func main() {
a := make(chan uint, 1);
b := make(chan uint, 1);
if v := Send(a, b); v != 2 {
panicln("Send returned", v, "!= 2");
}
if av, bv := <- a, <- b; av | bv != 3 {
panicln("bad values", av, bv);
}
if v := Send(a, nil); v != 1 {
panicln("Send returned", v, "!= 1");
}
if counter != 10 {
panicln("counter is", counter, "!= 10");
}
}
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