/
main.go
48 lines (39 loc) · 1.01 KB
/
main.go
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// Copyright 2017 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"log"
"os"
"runtime/trace"
)
func main() {
_ = trace.Start(os.Stdout)
defer trace.Stop()
const n = 3
leftmost := make(chan int)
right := leftmost
left := leftmost
for i := 0; i < n; i++ {
right = make(chan int)
go pass(left, right)
left = right
}
go sendFirst(right)
log.Println(<-leftmost)
}
func pass(left, right chan int) {
v := 1 + <-right
left <- v
}
func sendFirst(ch chan int) { ch <- 0 }