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05390a0793
The build tags are necessary to keep "go build" in that directory building only stdio.go, but we have to arrange for test/run.go to treat them as satisfied. Fixes #12625. Change-Id: Iec0cb2fdc2c9b24a4e0530be25e940aa0cc9552e Reviewed-on: https://go-review.googlesource.com/17454 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
53 lines
970 B
Go
53 lines
970 B
Go
// cmpout
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// 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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// +build test_run
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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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"runtime"
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"strconv"
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"../stdio"
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)
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func fibber(c, out chan int64, i 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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if i == 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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stdio.Stdout.WriteString(strconv.FormatInt(j, 10) + "\n")
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out <- j
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<-out
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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 int64)
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out := make(chan int64)
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go fibber(c, out, 0)
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go fibber(c, out, 1)
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<-out
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for i := 0; i < 90; i++ {
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out <- 1
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<-out
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}
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}
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