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Date: Fri, 31 May 2013 11:22:28 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: sqlite3: bug with monotone
Message-ID: <20130531092228.GB30659@calimero.vinschen.de>
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References: <51A6B6EB DOT 6050309 AT users DOT sourceforge DOT net> <loom DOT 20130530T122354-144 AT post DOT gmane DOT org> <51A7862F DOT 1070507 AT etr-usa DOT com> <51A7D47E DOT 3050502 AT users DOT sourceforge DOT net> <51A7F547 DOT 6020509 AT etr-usa DOT com>
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User-Agent: Mutt/1.5.21 (2010-09-15)

On May 30 18:56, Warren Young wrote:
> 1. We continue waiting for someone to to implement a per-process or
> per-subtree mandatory locking feature in Cygwin, so that "Unix mode"
> SQLite on Cygwin can be configured to cooperate with native SQLite.

What kind of locking does sqlite use on Cygwin:

[ ] POSIX fcntl locks
[ ] BSD flock locks
[ ] Old POSIX lockf locks?

Here's a proposal:

- Only add optional mandatory locking to fcntl and flock locks, not for
  lockf locks.

- Add a flag F_MDLCK which can be or'ed to struct flock's l_type.

- Add a flag LOCK_MD which can be or'ed to the 2nd parameter to flock(2).

- Using these flags, I'll resurrect the old pre-Cygwin 1.7 locking code
  which does NOT support F_GETLK.  I will try, but I can also not
  guarantee that a blocking, mandatory lock call will be interruptible
  by signals.

- For anything else, http://cygwin.com/acronyms/#PTC


Does that sound ok?


Corinna

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

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