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// 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
}
}