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go/misc/cgo/stdio/fib.go
Emmanuel Odeke 53fd522c0d all: make copyright headers consistent with one space after period
Follows suit with https://go-review.googlesource.com/#/c/20111.

Generated by running
$ grep -R 'Go Authors.  All' * | cut -d":" -f1 | while read F;do perl -pi -e 's/Go
Authors.  All/Go Authors. All/g' $F;done

The code in cmd/internal/unvendor wasn't changed.

Fixes #15213

Change-Id: I4f235cee0a62ec435f9e8540a1ec08ae03b1a75f
Reviewed-on: https://go-review.googlesource.com/21819
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2016-05-02 13:43:18 +00:00

53 lines
969 B
Go

// cmpout
// 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.
// +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"
"../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
}
}