mirror of
https://github.com/golang/go
synced 2024-11-13 20:40:31 -07:00
c6611b2f7e
Updates #30228 Change-Id: I4d213c6fe68c47ccb877f13b55128e035f76a26b Reviewed-on: https://go-review.googlesource.com/c/163421 Run-TryBot: Bryan C. Mills <bcmills@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
53 lines
989 B
Go
53 lines
989 B
Go
// run -tags=use_go_run
|
|
|
|
// 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"
|
|
|
|
"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
|
|
}
|
|
}
|