Thread Safety

[Clarence Gardner]

Hello all,

I have a multithreaded program in which I use the following pattern in
various places, because I was pretty sure it was thread-safe.  But since
I was just reading the thread about statcache, I thought I'd ask just to be
sure.  The code is in a function that runs periodically and disposes of
accumulated work:

def Periodic():
    global PendingDataStorage,PendingStatusUpdates
    while 1:
        time.sleep(10)
        Data,PendingDataStorage = PendingDataStorage,[]
        if Data:
            StoreDataPoints(Data)
        Data,PendingStatusUpdates = PendingStatusUpdates,[]
        if Data:
            SetErrorStatus(Data)

The code I'm talking about are the two binding statements, where
I bind to two names which form a tuple, rather than two statements,
which would certainly not be thread-safe.

Thanks,
--
Clarence Gardner
Software Engineer
NetLojix Communications
clarence at netlojix.com