[Buildbot-devel] SlaveLock across several slaves on same computer?

[Marcus Lindblom]

Hi,

I'm about to setup the third and fourth slave prcocess on two slave 
computers respectively, and I was thinking that a SlaveLock that is 
system wide (SystemLock?) would be good to have here. (We're already 
getting timeouts in some multithreading tests due to interference.)

Since Python doesn't seem to have a named system-wide mutex (AFAICT), I 
would implement it as a kernel Mutex on Windows (these are system-wide 
and not process-local as critical sections are) and via a lock-file (or 
whatever you guys use ;) on unixy systems.

(Or perhaps twisted has something applicable?)

However, it Brian's DB work will allow us to unify all masters/slaves 
into one process, this won't necessary as today's SlaveLock will suffice.

So, will that be the case, and if so, will the DB work be ready during Q1?

Otherwise I'd best get hacking. :)

Ideas?

Cheers,
/Marcus

P.S. I suppose a MasterSystemLock could also be useful as we'll be 
running five master processes on the same server.