Re: Unreliable flock

[Corinna Vinschen <corinna-cygwin@cygwin.com>]

[-- Attachment #1: Type: text/plain, Size: 1218 bytes --]

On Apr  3 00:22, Andrey Repin wrote:
> Greetings, All!
> 
> The script (let's call it test.sh):
> 
> #!/bin/dash -x
> _lock="./console-session.lock"
> {
>   flock -n 9 || {
>       echo "The $(cat "$_lock") command is running already."
>       exit 3
>     } >&2
> 
>   printf "$1" >&9
> 
>   trap 'rm "$_lock";' EXIT HUP INT ABRT TERM
> 
>   sleep 20
> 
> } 9>> "$_lock"
> 
> Very simple in essence.
> The one-liner:
> 
> { flock -n 9 && sleep 10 || echo Fail;} 9>> ./console-session.lock
> 
> Also extremely simple.
> 
> Open two terminals. mintty or native, bash or dash, doesn't matter.
> chdir to the directory with the script.
> 
> Start script in one terminal. ./test.sh
> Start oneliner in another terminal. Fail. How predictable!

I don't know what I'm doing wrong, but this WJFFM with Cygwin 2.4.1
as well as 2.5.0.  Additionally I tried to put the oneliner into a
script but it still WFM.

Apart from that, did you notice the flock restrictions outlined in
https://cygwin.com/cygwin-api/std-notes.html ?


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 819 bytes --]