Re: Shared memory and memory context question

On Sun February 5 2006 14:43, Martijn van Oosterhout wrote:
> So what you load are the already processed rules? In that case you
> could probably use the buffer management system. Ask it to load the
> blocks and they'll be in the buffer cache. As long as you have the
> buffer pinned they'll stay there. That's pretty much a read-only
> approach.
>
> If you're talking about things that don't come from disk, well, hmm...
> If you want you could use a file on disk as backing and mmap() it into
> each processes address space...
<...>
> The real question is, does it need to be shared-writable.
> Shared-readonly is much easier (ie one writer, multiple readers). Using
> a file as backing store for mmap() may be the easiest....

I load the rules from a script and parse them, storing them in a forest of
linked malloced structures. These structures are created by one writer but
then read by a number of readers, and later may be removed by the original
writer.

So, as you can imagine, I could store the forest in the db, although it might
be a mess. First I will look through the buffer management system, and see if
that will do the job.

Thanks for your help,

Regards,

Richard