Re: single task postgresql

Oleg Bartunov wrote:
>
> On Wed, 27 Feb 2002, mlw wrote:
>
> > Greg Copeland wrote:
> > >
> > > Windows does not really have shared memory support. This has been a
> > > beef with the Win32 API for a long time now. Because it has been a long
> > > time complaint, it was finally added in Win2000 and later. Likewise,
> > > I'd like to point out that thinks like sims, shared memory, pipes, etc,
> > > and other entities commonly used for concurrent programming strategies
> > > are slower in XP. So, because shared memory really isn't well
> > > supported, they elected to have what is, in essense, memory mapped
> > > files. Multiple processes then map the same file and read/write to it
> > > as needed, more or less as you would shared memory. Unless you plan on
> > > only targetting on Win 2000 and XP, it sounds like a waste of time.
> >
> > This is not really true. Under DOS windows, i.e. 95,98, etc. Shared memory can
> > be done in 16 bit land with a touch of assembly and a DLL. Allocate, with
> > globalalloc, a shared memory segment. The base selector is a valid 32 bit
> > selector, and the memory is mapped in the above 2G space shared and mapped to
> > all 32bit processes.
> >
> > Under NT through 2K, yes using a memory mapped files is the way to do it, but
> > you do not actually need to create a file, you can use (HANDLE)0xFFFFFFFF,
> > which is the NT equivilent of the system memory file. The handle returned is a
> > system global object which can be shared across processes.
> >
>
> Mark,
>
> do you consider to work on this issue ?

Yea, let me think about it. What is your time frame? When I offered to work on
it, I thought it could be a leasurely thing. I have to get a machine running
some form of Windows on which to develop and test.

I want to say yes, and if no one else does it, I will, but I'm not sure what
your timeframe is. If it is the mystical 7.3, then sure I can do it easily. If
you need something quickly, I can help, but I don't think I could shoulder the
whole thing.

I have a couple things I have promised people. Let me get those done. I will
try to write an equivilent set of functions for shget, shmat, etc. as soon as I
can. Anyone wanting to run with them can hack and test PostgreSQL on Windows.

How does that sound?