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This may be slightly off-topic but it is worth mentioning that the use of threading.Lock[1]
which was included to make the locks thread safe seems to be leading to a deadlock in eventlet[2].
It seems like we have rewritten this too many times in order to fix minor pain points and are
adding risk to a very important component of the system.

[1] https://review.openstack.org/#/c/54581
[2] https://bugs.launchpad.net/nova/+bug/1349452

On Aug 18, 2014, at 2:05 PM, Pádraig Brady <P at draigBrady.com> wrote:

> On 08/18/2014 03:38 PM, Julien Danjou wrote:
>> On Thu, Aug 14 2014, Yuriy Taraday wrote:
>> 
>> Hi Yuriy,
>> 
>> […]
>> 
>>> Looking forward to your opinions.
>> 
>> This looks like a good summary of the situation.
>> 
>> I've added a solution E based on pthread, but didn't get very far about
>> it for now.
> 
> In my experience I would just go with the fcntl locks.
> They're auto unlocked and well supported, and importantly,
> supported for distributed processes.
> 
> I'm not sure how problematic the lock_path config is TBH.
> That is adjusted automatically in certain cases where needed anyway.
> 
> Pádraig.
> 
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