mirror of https://go.googlesource.com/go
46 lines
919 B
Go
46 lines
919 B
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build ignore
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// Compute Fibonacci numbers with two goroutines
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// that pass integers back and forth. No actual
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// concurrency, just threads and synchronization
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// and foreign code on multiple pthreads.
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package main
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import (
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big "."
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"runtime"
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)
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func fibber(c chan *big.Int, out chan string, n int64) {
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// Keep the fibbers in dedicated operating system
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// threads, so that this program tests coordination
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// between pthreads and not just goroutines.
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runtime.LockOSThread()
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i := big.NewInt(n)
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if n == 0 {
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c <- i
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}
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for {
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j := <-c
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out <- j.String()
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i.Add(i, j)
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c <- i
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}
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}
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func main() {
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c := make(chan *big.Int)
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out := make(chan string)
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go fibber(c, out, 0)
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go fibber(c, out, 1)
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for i := 0; i < 200; i++ {
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println(<-out)
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}
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}
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