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Re: Feature request: Can bash provide some mechanism for locking/unlock

From: Clark J. Wang
Subject: Re: Feature request: Can bash provide some mechanism for locking/unlocking?
Date: Fri, 16 Apr 2010 12:05:47 +0800

On Fri, Apr 16, 2010 at 10:52 AM, Bob Proulx <address@hidden> wrote:

> Clark J. Wang wrote:
> > Bob Proulx wrote:
> > > There is also 'lockfile' distributed with 'procmail'.
> >
> > By using `lockfile'  we must make sure that our script will not crash and
> > the file is unlocked when the script exits.
> True.  That is true of any of the file based locking methods.  And
> advantage to the flock/lockf based methods such as flock(1).  But I
> almost always have cleanup traps for other reasons and incorporate the
> cleanup there to ensure that the lockfile is removed by the creating
> process when it exits.

Yes, cleanup traps are fine.

> As far as needing to make sure that your script doesn't crash, well,
> don't you need to do that anyway?  :-)


> > Although it provides timeout mechanism it's still not so convinient.
> Beware of the timeout.  That isn't safe and may violate your mutual
> exclusion section.  Actually it almost certainly will violate it.
> Bob

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