From 73df946d56c74384511a194dd01dbe099584fd1a Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 28 Apr 2024 15:14:23 +0200 Subject: Adding upstream version 1.16.10. Signed-off-by: Daniel Baumann --- misc/cgo/gmp/fib.go | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 misc/cgo/gmp/fib.go (limited to 'misc/cgo/gmp/fib.go') diff --git a/misc/cgo/gmp/fib.go b/misc/cgo/gmp/fib.go new file mode 100644 index 0000000..f1091b1 --- /dev/null +++ b/misc/cgo/gmp/fib.go @@ -0,0 +1,45 @@ +// 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 ignore + +// 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 ( + big "." + "runtime" +) + +func fibber(c chan *big.Int, out chan string, n int64) { + // Keep the fibbers in dedicated operating system + // threads, so that this program tests coordination + // between pthreads and not just goroutines. + runtime.LockOSThread() + + i := big.NewInt(n) + if n == 0 { + c <- i + } + for { + j := <-c + out <- j.String() + i.Add(i, j) + c <- i + } +} + +func main() { + c := make(chan *big.Int) + out := make(chan string) + go fibber(c, out, 0) + go fibber(c, out, 1) + for i := 0; i < 200; i++ { + println(<-out) + } +} -- cgit v1.2.3