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fib.go
// 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 } }
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