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cross plateform library to have only one instance of a software (based on python's tendo)

License: MIT License

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go-singleinstance's Introduction

go-singleinstance

Cross plateform library to have only one instance of a software (based on python's tendo).

Usage

package main

import (
	"fmt"
	"time"

	"github.com/allan-simon/go-singleinstance"
)

func main() {
	lockFile, err := singleinstance.CreateLockFile("plop.lock")
	if err != nil {
		fmt.Println("An instance already exists")
		return
	}
	defer lockFile.Close()

	fmt.Println("Sleeping...")
	time.Sleep(10 * time.Second)
	fmt.Println("Done")
}

If you try to launch it twice, the second instance will fail.

Thanks

For the python library trendo, from which I've shamelessly adapted the code.

Contribution

Don't be afraid if it says "last commit 2 years ago", this library is made to be small and simple so it's unlikely it changes after some times, however I'm pretty reactive on github overall, so feel free to use issues to ask question, propose patch etc. :)

License

MIT

go-singleinstance's People

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clocklear hut8 protonmail priestd09 szzhiyang tsubus prakashbhandari markusbkk nilmonster stephanrotolante tsupplis jingc1413

go-singleinstance's Issues

Windows functionality

Hey there @allan-simon

Are you sure that this works on Windows? What versions has it been tested on? I'm trying to use it on Windows 10 right now and the lock can always be obtained, no matter what.

Add a way to get the locking PID

One useful feature would be to be able to get the PID of the process which locks the file, to be able to send it a signal for instance.

Not working for me

Example doesn't lock if GC runs

I'm running

go version go1.9.1 windows/amd64

If I modify your example like this it doesn't lock:

_, err := singleinstance.CreateLockFile("plop.lock")
if err != nil {
	fmt.Println("An instance already exists")
	return
}
runtime.GC()

fmt.Println("Sleeping...")
time.Sleep(10 * time.Second)
fmt.Println("Done")

There isn't a bug in the library. But not saving that file pointer allows it to be garbage collected. An experienced GO programmer will probably see that right away. But having that example lead down a good path would be helpful. Very helpful library overall.

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