From: "Petteri Räty" <betelgeuse@gentoo.org>
To: mongrel-unicorn@rubyforge.org
Subject: Re: Issues with PID file renaming
Date: Tue, 10 Dec 2013 14:46:30 +0200 [thread overview]
Message-ID: <52A70D26.7020105@gentoo.org> (raw)
In-Reply-To: <20131126012036.GA5868@dcvr.yhbt.net>
On 26.11.2013 3.20, Eric Wong wrote:
>>
>> I think the way 4.6.2 worked is better. There should be a pid file for
>> the new master process the moment it's created.
>
>> What do you think?
>
> How about having the old process create a hard link to .oldbin,
> and having the new one override the pid if Process.ppid == pid file?
> The check is still racy, but that's what pid files are :<
>
Isn't it possible to always keep a valid pid file by using the fact that
mv is atomic? Basically the new process writes the pid first to a temp
file and then moves it over the old pid file after having hard linked
the file to .oldbin?
$ echo "1" > foo.pid
$ ln foo.pid foo.oldpid
$ echo "2" > tmp
$ mv tmp foo.pid
$ cat *pid
1
2
Regards,
Petteri
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next prev parent reply other threads:[~2013-12-10 12:53 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-26 1:00 Issues with PID file renaming Jimmy Soho
2013-11-26 1:20 ` Eric Wong
2013-11-26 1:40 ` Michael Fischer
2013-11-26 2:07 ` Eric Wong
2013-12-10 12:46 ` Petteri Räty [this message]
2013-12-10 19:52 ` Eric Wong
2013-12-10 22:44 ` Petteri Räty
2013-12-11 13:54 ` Michael Fischer
2013-12-12 19:15 ` Petteri Räty
2013-12-12 20:51 ` Eric Wong
2013-11-26 1:42 ` Michael Fischer
2013-11-26 4:55 ` Jimmy Soho
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