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https://github.com/golang/go
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01f5a17aa3
The misc/cgo/life and misc/cgo/stdio tests started out as fairly simple test cases when they were added, but the machinery to execute them has grown in complexity over the years. They currently reuse the test/run.go runner and its "run" action without needing much of the additional flexibility that said runner implements. Given that runner isn't well documented, it makes it harder to see that ultimately these tests just do 'go run' on a few test programs and check that the output matches a golden file. Maybe these test cases should move out of misc to be near similar tests, or the machinery to execute them can made available in a package that is easier and safer to reuse. I'd rather not block the refactor of the test directory runner on that, so for now rewrite these to be self-contained. Also delete misc/cgo/stdio/testdata/run.out which has no effect on the test. It was seemingly accidentally kept behind during the refactor in CL 6220049. For #56844. Change-Id: I5e2f542824925092cdddb03b44b6295a4136ccb4 Reviewed-on: https://go-review.googlesource.com/c/go/+/465755 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Austin Clements <austin@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org> Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
47 lines
914 B
Go
47 lines
914 B
Go
// 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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//go:build test_run
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// Pass numbers along a chain of threads.
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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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"cgostdio/stdio"
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)
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const N = 10
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const R = 5
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func link(left chan<- int, right <-chan int) {
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// Keep the links 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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for {
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v := <-right
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stdio.Stdout.WriteString(strconv.Itoa(v) + "\n")
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left <- 1 + v
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}
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}
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func main() {
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leftmost := make(chan int)
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var left chan int
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right := leftmost
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for i := 0; i < N; i++ {
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left, right = right, make(chan int)
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go link(left, right)
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}
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for i := 0; i < R; i++ {
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right <- 0
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x := <-leftmost
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stdio.Stdout.WriteString(strconv.Itoa(x) + "\n")
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}
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}
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