go issue18146 源码
golang issue18146 代码
文件路径：/misc/cgo/test/issue18146.go
// Copyright 2016 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 !windows
// +build !windows
// Issue 18146: pthread_create failure during syscall.Exec.
package cgotest
import (
"bytes"
"crypto/md5"
"os"
"os/exec"
"runtime"
"syscall"
"testing"
"time"
)
func test18146(t *testing.T) {
if testing.Short() {
t.Skip("skipping in short mode")
}
if runtime.GOOS == "darwin" || runtime.GOOS == "ios" {
t.Skipf("skipping flaky test on %s; see golang.org/issue/18202", runtime.GOOS)
}
if runtime.GOARCH == "mips" || runtime.GOARCH == "mips64" {
t.Skipf("skipping on %s", runtime.GOARCH)
}
attempts := 1000
threads := 4
// Restrict the number of attempts based on RLIMIT_NPROC.
// Tediously, RLIMIT_NPROC was left out of the syscall package,
// probably because it is not in POSIX.1, so we define it here.
// It is not defined on Solaris.
var nproc int
setNproc := true
switch runtime.GOOS {
default:
setNproc = false
case "aix":
nproc = 9
case "linux":
nproc = 6
case "darwin", "dragonfly", "freebsd", "netbsd", "openbsd":
nproc = 7
}
if setNproc {
var rlim syscall.Rlimit
if syscall.Getrlimit(nproc, &rlim) == nil {
max := int(rlim.Cur) / (threads + 5)
if attempts > max {
t.Logf("lowering attempts from %d to %d for RLIMIT_NPROC", attempts, max)
attempts = max
}
}
}
if os.Getenv("test18146") == "exec" {
runtime.GOMAXPROCS(1)
for n := threads; n > 0; n-- {
go func() {
for {
_ = md5.Sum([]byte("Hello, !"))
}
}()
}
runtime.GOMAXPROCS(threads)
argv := append(os.Args, "-test.run=NoSuchTestExists")
if err := syscall.Exec(os.Args[0], argv, os.Environ()); err != nil {
t.Fatal(err)
}
}
var cmds []*exec.Cmd
defer func() {
for _, cmd := range cmds {
cmd.Process.Kill()
}
}()
args := append(append([]string(nil), os.Args[1:]...), "-test.run=Test18146")
for n := attempts; n > 0; n-- {
cmd := exec.Command(os.Args[0], args...)
cmd.Env = append(os.Environ(), "test18146=exec")
buf := bytes.NewBuffer(nil)
cmd.Stdout = buf
cmd.Stderr = buf
if err := cmd.Start(); err != nil {
// We are starting so many processes that on
// some systems (problem seen on Darwin,
// Dragonfly, OpenBSD) the fork call will fail
// with EAGAIN.
if pe, ok := err.(*os.PathError); ok {
err = pe.Err
}
if se, ok := err.(syscall.Errno); ok && (se == syscall.EAGAIN || se == syscall.EMFILE) {
time.Sleep(time.Millisecond)
continue
}
t.Error(err)
return
}
cmds = append(cmds, cmd)
}
failures := 0
for _, cmd := range cmds {
err := cmd.Wait()
if err == nil {
continue
}
t.Errorf("syscall.Exec failed: %v\n%s", err, cmd.Stdout)
failures++
}
if failures > 0 {
t.Logf("Failed %v of %v attempts.", failures, len(cmds))
}
}
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