mirror of
https://github.com/golang/go
synced 2024-11-26 06:07:57 -07:00
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
|
|
|
|
// 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
|
|
|
|
const N = 10
|
|
|
|
func AsynchFifo() {
|
|
ch := new(chan int, N);
|
|
for i := 0; i < N; i++ {
|
|
ch <- i
|
|
}
|
|
for i := 0; i < N; i++ {
|
|
if <-ch != i {
|
|
print("bad receive\n");
|
|
sys.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 := new(chan int);
|
|
in := new(chan int);
|
|
start := in;
|
|
for i := 0; i < N; i++ {
|
|
out := new(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();
|
|
}
|
|
|