Re: file-locking and postmaster.pid

[Andrew Dunstan <andrew(at)dunslane(dot)net>]

Alvaro Herrera wrote:
> Alvaro Herrera wrote:
>
>   
> > Note that it may fail!  This seems to indicate that some platforms do
> > not provide either locking mechanism.
> >     
>
> (Which means the whole discussion is a waste of time)
>
>   

Umm, no, I don't think so. It will block instead of failing unless you 
request a non blocking call. Failure means someone else holds the lock.

But what Tom says about NFS is probably true, and a good enough reason 
not to trust locking in general for this purpose, I think

cheers

andrew