[REBOL] Re: Multiuser database
From: SunandaDH:aol at: 21-Mar-2006 10:32
Paavo:
> I have been quite happy with semaphores.
It'd be worth checking the source of the semaphore handler you are using.
it could be doing something incredibly clever and will work safely on all
REBOL platforms -- if so I'd like to know.
Or it could be doing something that works safely on *your* operating system
-- such as creating a lock file under an opsys that handles exclusive locks
sensibly.
Or maybe you've just been lucky so far. The sort of cases Pekr and I have
been mentioning are probably not a problem for a lightly loaded system. You may
never hit a problem even with a faulty locking mechanism.
Pekr:
> what about checksum/secure? Should provide you enough of randomizer ....
random/secure 100'000'000'000
Gives you a highly probable GUID, especially if concatenated to the process
start time, the time you request the GUID, and the IP address. Assuming
random/secure is not generated from the process start time.
Probably not good enough for safety critical work, but should work in most
office critical systems.
Of course, if REBOL had a semaphore system that worked cross-platform, it'd
be so much simpler for all of us. Surely the Async changes must deliver such a
toy?
Sunanda.
