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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.
// Verify that unbuffered channels act as pure fifos.
package main
import "os"
const N = 10
func AsynchFifo() {
ch := make(chan int, N)
for i := 0; i < N; i++ {
ch <- i
}
for i := 0; i < N; i++ {
if <-ch != i {
print("bad receive\n")
os.Exit(1)
}
}
}
func Chain(ch <-chan int, val int, in <-chan int, out chan<- int) {
<-in
if <-ch != val {
panic(val)
}
out <- 1
}
// thread together a daisy chain to read the elements in sequence
func SynchFifo() {
ch := make(chan int)
in := make(chan int)
start := in
for i := 0; i < N; i++ {
out := make(chan int)
go Chain(ch, i, in, out)
in = out
}
start <- 0
for i := 0; i < N; i++ {
ch <- i
}
<-in
}
func main() {
AsynchFifo()
SynchFifo()
}
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