mirror of
https://github.com/golang/go
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27c0eb8431
powser1.go has not been tested - waiting for compiler to catch up R=ken OCL=15415 CL=15415
56 lines
931 B
Go
56 lines
931 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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// Verify that unbuffered channels act as pure fifos.
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package main
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const N = 10
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func AsynchFifo() {
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ch := new(chan int, N);
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for i := 0; i < N; i++ {
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ch <- i
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}
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for i := 0; i < N; i++ {
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if <-ch != i {
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print("bad receive\n");
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sys.exit(1);
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}
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}
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}
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func Chain(ch *<-chan int, val int, in *<-chan int, out *chan<- int) {
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<-in;
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if <-ch != val {
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panic(val)
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}
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out <- 1
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}
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// thread together a daisy chain to read the elements in sequence
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func SynchFifo() {
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ch := new(chan int);
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in := new(chan int);
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start := in;
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for i := 0; i < N; i++ {
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out := new(chan int);
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go Chain(ch, i, in, out);
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in = out;
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}
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start <- 0;
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for i := 0; i < N; i++ {
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ch <- i
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}
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<-in
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}
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func main() {
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AsynchFifo();
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SynchFifo();
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}
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