On Tue, Dec 1, 2015 at 7:57 AM David Cheney <[email protected]> wrote:
> Doesn't look like there is windows support, and it uses fcntl (flock) > under the hood, which is what we have now. > flock isn't the problematic thing Tim is talking about. utils/fslock attempts to create a directory in a known location, and if it succeeds, it "holds the lock". Unlocking means removing the directory. We would have to contribute Windows support, but it's not hard, I've done it before. > On Tue, Dec 1, 2015 at 10:55 AM, Casey Marshall > <[email protected]> wrote: > > How about github.com/camlistore/lock ? > > > > On Mon, Nov 30, 2015 at 5:43 PM, Tim Penhey <[email protected]> > > wrote: > >> > >> Hi folks, > >> > >> The fslock was a mistake that I added to the codebase some time back. It > >> provided an overly simplistic solution to a more complex problem. > >> > >> Really the filesystem shouldn't be used as a locking mechanism. > >> > >> Most of the code that exists for the fslock now is working around its > >> deficiencies. Instead we should be looking for a better replacement. > >> > >> Some "features" that were added to fslock were added to work around the > >> issue that the lock did not die with the process that created it, so > >> some mechanism was needed to determine whether the lock should be broken > >> or not. > >> > >> What we really need is a good OS agnostic abstraction that provides the > >> ability to create a "named" lock, acquire the lock, release the lock, > >> and make sure that the lock dies when the process dies, so another > >> process that is waiting can acquire the lock. This way no "BreakLock" > >> functionality is required, nor do we need to try and do think like > >> remember which process owns the lock. > >> > >> So... > >> > >> We have three current operating systems we need to support: > >> > >> Linux - Ubuntu and CentOS > >> MacOS - client only - bit the CLI uses a lock for the local cache > >> Windows > >> > >> For Linux, and possibly MacOS, flock is a possibility, but can we do > >> better? Is there something that is better suited? > >> > >> For Windows, while you can create global semaphores or mutex instances, > >> I'm not sure of entities that die with the process. Can people recommend > >> solutions? > >> > >> Cheers, > >> Tim > >> > >> -- > >> Juju-dev mailing list > >> [email protected] > >> Modify settings or unsubscribe at: > >> https://lists.ubuntu.com/mailman/listinfo/juju-dev > > > > > > > > -- > > Juju-dev mailing list > > [email protected] > > Modify settings or unsubscribe at: > > https://lists.ubuntu.com/mailman/listinfo/juju-dev > > > > -- > Juju-dev mailing list > [email protected] > Modify settings or unsubscribe at: > https://lists.ubuntu.com/mailman/listinfo/juju-dev >
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