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Date:	Fri, 13 Feb 2015 10:23:39 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Writing to /dev/clipboard from multiple processes in Bash gives inconsistent behaviour
Message-ID:	<20150213092339.GB17624@calimero.vinschen.de>
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References:	<20150212134550 DOT GC20741 AT dinwoodie DOT org> <20150212170342 DOT GB7818 AT calimero DOT vinschen DOT de> <925263616 DOT 20150213005102 AT yandex DOT ru>
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On Feb 13 00:51, Andrey Repin wrote:
> Greetings, Corinna Vinschen!
>=20
> > On Feb 12 13:45, Adam Dinwoodie wrote:
> >> I've spotted some slightly odd behaviour when writing things from
> >> multiple processes to /dev/clipboard.
> >>=20
> >> Easiest to show this with an example:
> >>=20
> >>     for n in {1..10}; do echo $n; done >/dev/clipboard; cat /dev/clipb=
oard
> >>=20
> >> I expect this to print out the numbers 1=E2=80=9310 to the terminal.  =
Sometimes
> >> it does, but sometimes it misses out some of the numbers at the end;
> >> printing the digits 1=E2=80=938, say, but no more.  Generally it gets =
to around
> >> 7=E2=80=939, but I've seen it managing to only get up to 3 on one occa=
sion.
>=20
> > I can't reproduce this.  First I tried this manually a couple of times,
> > but then I created a loop:
>=20
> >   for i in {1..1000}
> >   do
> >     echo > /dev/clipboard
> >     for n in {1..10}; do echo $n; done > /dev/clipboard
> >     grep -q 10 /dev/clipboard || cat /dev/clipboard
> >   done
>=20
> > and it didn't fail once.  I'm not sure what to do if I don't have a
> > reproducible testcase...
>=20
> Failed ~20 times for me. And the more, the more I run the test.
> What is more curious, is if I modify your test to only print "1",
>=20
> while true; do
>   echo > /dev/clipboard
>   for n in {1..10}; do echo $n; done > /dev/clipboard
>   grep -q 10 /dev/clipboard || grep 1 /dev/clipboard
> done
>=20
> it sporadically print 10 !
> And my mail client actively flashing "paste" buttons, when the script is
> working in background. May be that's it.
>=20
> This is more visible:
> $ while true; do { i=3D$(( $i+1 )); echo > /dev/clipboard; for n in {1..1=
0}; do echo $n; done > /dev/clipboard; grep -q 10 /dev/clipboard || { grep =
10 /dev/clipboard && echo $i;};}; done;

Nope, no way.  I'm running this latter test for 45 minutes now, with
no output.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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