dTHX; // Returns NULL for my_perl :(

    // Call a PERL function
    dSP;                                                        /* Initialize stack pointer         */
    ENTER;                                                      /* Everything created after here    */
    SAVETMPS;                                                   /* ...is a temporary variable.      */
    PUSHMARK(SP);                                               /* Remember the stack pointer       */
    XPUSHs(sv_2mortal(newSViv((unsigned int)cbCtx)));           /* Push callback context onto stack */
    
    my_hash = newHV();
    my_arr  = newAV();

    hv_store( my_hash, "aaaaaa", 6, newSViv(42), 0 );

    for ( int i = 0; i < 50; i++ )
    {
        av_push( my_arr, newSViv((unsigned int)i) );
    }

    // Store reference to parameters on the HASH
    hv_store( my_hash, "bbbbbb", 6, newRV((SV*)my_arr), 0 );

    XPUSHs( sv_2mortal(newRV((SV*)my_hash)) );

    //PUTBACK;                                                  /* Make local stack pointer global  */
    call_pv( funcName, G_SCALAR );                              /* Call the function                */
    retVal = POPi;                                              /* POP the return of the PERL function */
    SPAGAIN;                                                    /* Refresh stack pointer            */
    PUTBACK;
    FREETMPS;                                                   /* free that return value           */
    LEAVE;                                                      /* ...and the XPUSHed "mortal" args */