| // 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. |
| |
| // 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 ( |
| big "gmp"; |
| "runtime"; |
| ) |
| |
| func fibber(c chan *big.Int, out chan string, n int64) { |
| // Keep the fibbers in dedicated operating system |
| // threads, so that this program tests coordination |
| // between pthreads and not just goroutines. |
| runtime.LockOSThread(); |
| |
| i := big.NewInt(n); |
| if n == 0 { |
| c <- i; |
| } |
| for { |
| j := <-c; |
| out <- j.String(); |
| i.Add(i, j); |
| c <- i; |
| } |
| } |
| |
| func main() { |
| c := make(chan *big.Int); |
| out := make(chan string); |
| go fibber(c, out, 0); |
| go fibber(c, out, 1); |
| for i := 0; i < 200; i++ { |
| println(<-out); |
| } |
| } |