1 // cmpout 2 3 // Copyright 2009 The Go Authors. All rights reserved. 4 // Use of this source code is governed by a BSD-style 5 // license that can be found in the LICENSE file. 6 7 // +build ignore 8 9 // Compute Fibonacci numbers with two goroutines 10 // that pass integers back and forth. No actual 11 // concurrency, just threads and synchronization 12 // and foreign code on multiple pthreads. 13 14 package main 15 16 import ( 17 "../stdio" 18 "runtime" 19 "strconv" 20 ) 21 22 func fibber(c, out chan int64, i int64) { 23 // Keep the fibbers in dedicated operating system 24 // threads, so that this program tests coordination 25 // between pthreads and not just goroutines. 26 runtime.LockOSThread() 27 28 if i == 0 { 29 c <- i 30 } 31 for { 32 j := <-c 33 stdio.Stdout.WriteString(strconv.FormatInt(j, 10) + "\n") 34 out <- j 35 <-out 36 i += j 37 c <- i 38 } 39 } 40 41 func main() { 42 c := make(chan int64) 43 out := make(chan int64) 44 go fibber(c, out, 0) 45 go fibber(c, out, 1) 46 <-out 47 for i := 0; i < 90; i++ { 48 out <- 1 49 <-out 50 } 51 } 52
