memory mapped files under Carbon

[Jedidja Bourgeois]

Hi

I'm wondering if there's any way to do memory mapped file access under
MacOS 9 and X with a Carbon application. OpenMappedFile isn't part of
CarbonLib (just InterfaceLib) and, obviously, mmap() isn't available
under OS 9. Is it possible to have a single executable that links
against both CarbonLib and InterfaceLib that calls OpenMappedFile()
under 9 and mmap() under X? Or do you have to switch to having a
non-Carbon application for 9 alltogether?

Many thanks
Jedidja

[Miro Jurisic]

In article <b4b8c5a0.0309101150.5e5df006@posting.google.com >,
[email]jedidjab79@hotmail.com[/email] (Jedidja Bourgeois) wrote:

> I'm wondering if there's any way to do memory mapped file access under
> MacOS 9 and X with a Carbon application. OpenMappedFile isn't part of
> CarbonLib (just InterfaceLib) and, obviously, mmap() isn't available
> under OS 9. Is it possible to have a single executable that links
> against both CarbonLib and InterfaceLib that calls OpenMappedFile()
> under 9 and mmap() under X? Or do you have to switch to having a
> non-Carbon application for 9 alltogether?

It's not possibly to do it with a single executable that links against both. It
is possible to do it with a single CFM executable by having that executable
contain an application and two shared libraries, and then having the application
load one or the other shared library, depending on the OS. The interface between
the libraries and the application would be up to you, and the shared libraries
would use either just mmap or just OpenMappedFile.

You should also know that OpenMappedFile allows at most one file to be open at
any time _across all applications_, so I would recommend you find a better way
to do what you want.

meeroh

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