| // 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. | |
| //go:build test_run | |
| // 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 ( | |
| "runtime" | |
| "strconv" | |
| "cgostdio/stdio" | |
| ) | |
| 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 | |
| } | |
| } | |