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Date: Sat, 30 Mar 2013 07:16:07 +0400
From: Andrey Repin <anrdaemon AT freemail DOT ru>
Reply-To: Andrey Repin <cygwin AT cygwin DOT com>
Message-ID: <905027619.20130330071607@mtu-net.ru>
To: =?ISO-8859-1?B?QW5kcmVhcyBTdGVlbnBh3w==?= <steenpass AT mathematik DOT uni-kl DOT de>,
        <cygwin AT cygwin DOT com>
Subject: Re: SIGCHLD is not delivered
In-Reply-To: <5155E031.4030901@mathematik.uni-kl.de>
References: <5154460D DOT 4090101 AT mathematik DOT uni-kl DOT de> <20130329132942 DOT GD3460 AT ednor DOT casa DOT cgf DOT cx> <5155E031 DOT 4030901 AT mathematik DOT uni-kl DOT de>
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Greetings, Andreas Steenpaß!

>>> I have noticed that sometimes SIGCHLD is not delivered when a child
>>> process exits. I can reproduce this behaviour reliably under the
>>> following, very special circumstances:
>> I've uploaded a new snapshot which seems to fix this problem.  Before
>> running it, I could see a rare when I ran your test case in a loop.
>> After, I never saw a hang.
>>
>> Thanks for the test case and please give the snapshot a try.

> I've installed the newest snapshot and recompiled the test case, but it
> still hangs on my system. I'm sorry for interfering with your release.
> Is there any further information I could provide to solve this issue?

> Just to be sure:
> $ uname -a
> CYGWIN_NT-6.1-WOW64 zoppo 1.7.18s(0.263/5/3) 20130329 13:18:55 i686 Cygwin

> My installation of Windows runs in a virtual machine.

Knowing, which VM it is, and what is the container settings in regard to
hardware virtualisation support, would be helpful.

> Could this maybe
> influence the race conditions? I've noticed that the resolutions I get
> with clock_gettime(CLOCK_REALTIME, ...); are quite coarse (a few
> milliseconds!) in comparison to my Linux system (nanoseconds), or is
> this a general Cygwin thing?


--
WBR,
Andrey Repin (anrdaemon AT freemail DOT ru) 30.03.2013, <07:14>

Sorry for my terrible english...