using a pfNewDPool between unrelated processes

New Message Reply Date view Thread view Subject view Author view

John Granieri (granieri++at++babar.cis.upenn.edu)
Thu, 04 Nov 93 16:27:44 -0500

Hello:

I'm trying to use a datapool between two unrelated processes (one is
just a slightly modified version of perfly, the other is a 3D GL
program). My problem is this:

the perfly process creates the datapool correctly, but the other
process can't attach to it. errno is "Device or resource busy" after
calling pfAttachDPool in the other process.

Here's the code:

in modified perfly:
....
    /* create shared memory */
    jackpool = pfNewDPool(32*1024, "jackperf");
     
    jackup = (JackUpdate*)pfDPoolAlloc(jackpool,sizeof(JackUpdate), 1);
    jackup->frame = -1;
    jackfigs = (FigureUpdate*)pfDPoolAlloc(jackpool,
                                        sizeof(FigureUpdate)*MAX_FIGURE, 2);
    jackjoints = (JointUpdate*)pfDPoolAlloc(jackpool,
                                        sizeof(JointUpdate)*MAX_JOINT, 3);
    pfDPoolUnlock((void*)jackup);
    pfDPoolUnlock((void*)jackfigs);
    pfDPoolUnlock((void*)jackjoints);

This seems to work, and the arena file is created rw-rw-rw- in
/usr/tmp

Then, in other process: (the other process is a GL-based program, with
it's own run-time database, not using Performer)

    static int p=0;

    if (!p) {
        pfInit();
        p = 1;
    }
    if ((jackpool=pfAttachDPool("jackperf"))==NULL) {
        printf("\ncan't attach to performer datapool\n");
        return 0;
    }

It never attaches, even after repeatedly calling the above code. Any
ideas?
Thanks

-John

New Message Reply Date view Thread view Subject view Author view

This archive was generated by hypermail 2.0b2 on Mon Aug 10 1998 - 17:50:05 PDT

This message has been cleansed for anti-spam protection. Replace '++at++' in any mail addresses with the '@' symbol.