[dm-devel] [PATCH v2 1/7] libmultipath: fix tur checker locking

[Martin Wilck]

On Sat, 2018-02-10 at 17:11 +0100, Martin Wilck wrote:
> On Fri, 2018-02-09 at 18:36 -0600, Benjamin Marzinski wrote:
> > On Sat, Feb 10, 2018 at 12:36:05AM +0100, Martin Wilck wrote:
> > > On Sat, 2018-02-10 at 00:28 +0100, Martin Wilck wrote:
> > > > Maybe it's easier than we thought. Attached is a patch on top
> > > > of
> > > > yours that I think might work, please have a look. 
> > > > 
> > > 
> > > That one didn't even compile. This one is better.
> > > 
> > > Martin
> > 
> > How about this one instead. The idea is that once we are in the
> > cleanup
> > handler, we just cleanup and exit. But before we enter it, we
> > atomically
> > exchange running, and if running was 0, we pause(), since the
> > checker
> > is
> > either about to cancel us, or already has.
> > 
> 
> Yes, that should work. Nice.

... but I just realized that we don't rcu_register_thread() the TUR
thread. Maybe we should if we use RCU primitives?

Martin

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