Re: Using shared arenas

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John Rohlf (jrohlf++at++tubes)
Tue, 22 Mar 94 14:16:11 PST

>
> Is there any problem with using shared memory arenas under Performer?
> IE: usinit() in addition to pfDataPool().

        An interaction is possible since pfNewDPool sets up some usconfig
        parameters that will be inherited by your usinit but these
        default are almost always reasonable:

    usconfig(CONF_INITUSERS, MAXDPUSERS); /* up to MAXDPUSERS users */
    usconfig(CONF_ARENATYPE, US_GENERAL); /* allow unrelated processes */
    usconfig(CONF_LOCKTYPE, US_NODEBUG); /* fastest locks */

        Also, you may have trouble mapping datapools to the same
        virtual address if you have your own usinit arenas that
        aren't shared by everyone. Perhaps jimh could comment on this?

> More generally: What is the best way to share memory between non-related
> processes in Performer without having to link with Performer on both
> processes.

        usinit and usgetinfo/usputinfo are what datapools use so this
        method should be OK.

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