On Fri, Apr 16, 2010 at 10:52 AM, Bob Proulx <b...@proulx.com> 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? :-) > Agree. > > > 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 > > >
