mirror of
https://github.com/golang/go
synced 2024-11-06 06:36:20 -07:00
52 lines
919 B
Go
52 lines
919 B
Go
// $G $D/$F.go && $L $F.$A && ./$A.out
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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var counter uint
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var shift uint
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func GetValue() uint {
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counter++;
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return 1 << shift
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}
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func Send(a, b chan uint) int {
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var i int;
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LOOP:
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for {
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select {
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case a <- GetValue():
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i++;
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a = nil;
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case b <- GetValue():
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i++;
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b = nil;
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default:
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break LOOP;
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}
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shift++;
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}
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return i;
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}
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func main() {
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a := make(chan uint, 1);
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b := make(chan uint, 1);
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if v := Send(a, b); v != 2 {
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panicln("Send returned", v, "!= 2");
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}
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if av, bv := <- a, <- b; av | bv != 3 {
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panicln("bad values", av, bv);
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}
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if v := Send(a, nil); v != 1 {
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panicln("Send returned", v, "!= 1");
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}
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if counter != 10 {
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panicln("counter is", counter, "!= 10");
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}
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}
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