Re: Best way to Share Read only Data between processes.

[Martin Norbäck]

Mon Jan 17 2000, Kevin Atkinson ->
> Could some of the unix programers on the list give me some hints as the
> best way to share readonly memory between processes.  Specially I would
> like for multiple aspell processes to be able to share the main word
> list.  Is formatting the data file so that it can be directly read into
> memory without any processing and using mmap the best bet?  Or is there
> a better way?

Formatting the data file so that it can be mmap:ed directly is the only
way I can think of. Processes have their own adress space, so in order
for them to share a memory segment, it either has to be on disk or on
process must be a fork of the other (in which case it inherits all
read-only segments).

If you don't want to change the database format you can mmap a temporary
file to which the first aspell process writes formatted data, and the
other aspell processes mmap:s.

        n.

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