Record Locking Help ....

[Ben Duncan]

Good, then mmap is it !!!

I already have started breaking apart tdb. I do not need certain
parts of it, and I need to add other parts.

In particular, I will be adding the "list" functionality from
S-lang and some marshalling and un-marshalling routines to create
the multi-value concept.

Thanks ...

Roger Oberholtzer wrote:
> On Tue, 2005-08-16 at 14:44, Ben Duncan wrote:
> 
> Each mmap is independent. It is per-process. Just like the open/close.
> How the different processes see updates from another process is a bit
> unclear to me. I think (could be wrong) they share any file segment by
> the virtual memory system mapping the same memory page into each
> process. Which is why you need the locks. But this may also mean that
> the changes may be seen by the other processes before they are sent to
> disk with msync. Or maybe it is the MS_INVALIDATE flag to msync that
> will cause this to happen.
> 
> 
>>
>>Thanks ...
>>
-- 
Ben Duncan   - VersAccounting Software LLC 336 Elton Road  Jackson MS, 39212
"Never attribute to malice, that which can be adequately explained by stupidity"
        - Hanlon's Razor