Navigation Menu

Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

syscall: signal SIGURG(I/O condition) on go1.14.1, but no SIGURG signal before go 1.14 #38290

Closed
yangwenmai opened this issue Apr 7, 2020 · 3 comments
Closed

syscall: signal SIGURG(I/O condition) on go1.14.1, but no SIGURG signal before go 1.14 #38290

yangwenmai opened this issue Apr 7, 2020 · 3 comments
Labels
FrozenDueToAge

Comments

@yangwenmai
Copy link
Contributor

What version of Go are you using (go version)?

$ go version
1.14.1
1.13.8

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

go env Output
$ go env

GO111MODULE=""

GOARCH="amd64"

GOBIN="/Users/maiyang/develop/goworkspace/bin"

GOCACHE="/Users/maiyang/Library/Caches/go-build"

GOENV="/Users/maiyang/Library/Application Support/go/env"

GOEXE=""

GOFLAGS=""

GOHOSTARCH="amd64"

GOHOSTOS="darwin"

GONOPROXY=""

GONOSUMDB=""

GOOS="darwin"

GOPATH="/Users/maiyang/develop/goworkspace"

GOPRIVATE=""

GOPROXY="https://proxy.golang.org,direct"

GOROOT="/Users/maiyang/develop/go1.13.8"

GOSUMDB="sum.golang.org"

GOTMPDIR=""

GOTOOLDIR="/Users/maiyang/develop/go1.13.8/pkg/tool/darwin_amd64"

GCCGO="gccgo"

AR="ar"

CC="clang"

CXX="clang++"

CGO_ENABLED="1"

GOMOD=""

CGO_CFLAGS="-g -O2"

CGO_CPPFLAGS=""

CGO_CXXFLAGS="-g -O2"

CGO_FFLAGS="-g -O2"

CGO_LDFLAGS="-g -O2"

PKG_CONFIG="pkg-config"

GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/hy/qzqhs53939lg6b93mr419lnh0000gn/T/go-build297497902=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

package main

import (
	"fmt"
	"os"
    "runtime"
	"os/signal"
	"syscall"
)

func main() {
	s := make(chan os.Signal, 1)
	signal.Notify(s)
	go func() {
		for {
		}
	}()
	for {
		switch signal := <-s; signal {
		case os.Interrupt, os.Kill, syscall.SIGABRT, syscall.SIGTERM:
			fmt.Println("stopped")
			return
			case syscall.SIGURG:
			 fmt.Println("sigurg")
			runtime.Gosched()
		default:
			fmt.Printf("unhandled signal: %v\n", signal)
		}
	}
}

What did you expect to see?

Output:

sigurg
sigurg
sigurg
sigurg
sigurg
sigurg
...

What did you see instead?

On go1.14.1 is output:

sigurg
sigurg
sigurg
sigurg
sigurg
sigurg
...

But on go1.13.8 is empty output.

Maybe we should keep the same with the old version(empty output)?
@OneOfOne
Copy link
Contributor

OneOfOne commented Apr 7, 2020 •
edited

That's due to the new Non-cooperative goroutine preemption.

@andybons
Copy link
Member

andybons commented Apr 7, 2020

Duplicate of #37942

@andybons andybons marked this as a duplicate of #37942 Apr 7, 2020
@andybons andybons closed this as completed Apr 7, 2020
@yangwenmai
Copy link
Contributor Author

Thanks.

@hitzhangjie hitzhangjie mentioned this issue Aug 29, 2020
Merged
@golang golang locked and limited conversation to collaborators Apr 8, 2021
Sign up for free to subscribe to this conversation on GitHub. Already have an account? Sign in.
Assignees
No one assigned
Labels
FrozenDueToAge
Projects
None yet
Milestone
No milestone
Development

No branches or pull requests
4 participants
@andybons @OneOfOne @yangwenmai @gopherbot