| // 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. |
| |
| // +build ignore |
| |
| // Compute Fibonacci numbers with two goroutines |
| // that pass integers back and forth. No actual |
| // concurrency, just threads and synchronization |
| // and foreign code on multiple pthreads. |
| |
| package main |
| |
| import ( |
| "../stdio" |
| "runtime" |
| "strconv" |
| ) |
| |
| func fibber(c, out chan int64, i int64) { |
| // Keep the fibbers in dedicated operating system |
| // threads, so that this program tests coordination |
| // between pthreads and not just goroutines. |
| runtime.LockOSThread() |
| |
| if i == 0 { |
| c <- i |
| } |
| for { |
| j := <-c |
| stdio.Stdout.WriteString(strconv.FormatInt(j, 10) + "\n") |
| out <- j |
| <-out |
| i += j |
| c <- i |
| } |
| } |
| |
| func main() { |
| c := make(chan int64) |
| out := make(chan int64) |
| go fibber(c, out, 0) |
| go fibber(c, out, 1) |
| <-out |
| for i := 0; i < 90; i++ { |
| out <- 1 |
| <-out |
| } |
| } |