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Annotation of 42BSD/ingres/source/ctlmod/do_st.c, revision 1.1

1.1     ! root        1: # include      "ctlmod.h"
        !             2: # include      "pipes.h"
        !             3: # include      <sccs.h>
        !             4: 
        !             5: SCCSID(@(#)do_st.c     7.1     2/5/81)
        !             6: 
        !             7: /*
        !             8: **  DO_ST -- do a state.
        !             9: **
        !            10: **     This routine does a state as indicated by ppb, handing it
        !            11: **     pc & pv as parameters.  The state must be known already.
        !            12: **
        !            13: **     If the state is local, it calls 'call_fn' to actually
        !            14: **     do the setup and call the function.
        !            15: **     If the state is remote, it uses send_off to send ppb
        !            16: **     to the process that can do it.
        !            17: **
        !            18: **     It returns the next state to execute, possibly PB_UNKNOWN.
        !            19: **
        !            20: **     Parameters:
        !            21: **             ppb -- a pipe block which identifies the state
        !            22: **                     to call, etc.
        !            23: **             pc -- the pc to hand to the function.
        !            24: **             pv -- the pv to had to the function.
        !            25: **
        !            26: **     Returns:
        !            27: **             none (except through ppb)
        !            28: **
        !            29: **     Side Effects:
        !            30: **             *ppb gets set to identify the next state.
        !            31: **             Resp is set if local function.
        !            32: **
        !            33: **     Called By:
        !            34: **             do_seq
        !            35: **
        !            36: **     Trace Flags:
        !            37: **             2.8 - 2.15
        !            38: */
        !            39: 
        !            40: do_st(ppb, pc, pv)
        !            41: register pb_t  *ppb;
        !            42: int            pc;
        !            43: PARM           *pv;
        !            44: {
        !            45:        register state_t        *s;
        !            46:        register int            i;
        !            47:        int                     rtval;
        !            48: 
        !            49:        i = ppb->pb_st;
        !            50:        s = &Cm.cm_state[i];
        !            51:        if (i < 0 || i > CM_MAXST || s->st_type == ST_UNDEF)
        !            52:                syserr("do_st: undef state %d", i);
        !            53: # ifdef xCTR1
        !            54:        if (tTf(2, 8))
        !            55:                lprintf("do_st: state %d type %d mark %d\n",
        !            56:                    i, s->st_type, markbuf(Qbuf));
        !            57: # endif
        !            58: 
        !            59:        switch (s->st_type)
        !            60:        {
        !            61:          case ST_REMOT:
        !            62:                /*
        !            63:                **  Remote: determine the correct process and send
        !            64:                **  it on its way.
        !            65:                */
        !            66: 
        !            67:                ppb->pb_proc = s->st_v.st_rem.st_proc;
        !            68:                send_off(ppb, pc, pv);
        !            69:                pb_flush(ppb);
        !            70:                rtval = PB_UNKNOWN;
        !            71:                break;
        !            72: 
        !            73:          case ST_LOCAL:
        !            74:                /*
        !            75:                **  Local: execute the function using 'call_fn'
        !            76:                **  and compute next state.
        !            77:                **  If call originated in this process, set the EOF bit
        !            78:                **  so we don't try to read this pipe later.
        !            79:                */
        !            80: 
        !            81:                if (bitset(PB_FRFR, ppb->pb_stat) && !bitset(ST_EXTERN, s->st_stat))
        !            82:                        syserr("do_st: restricted state %d", i);
        !            83:                if (ppb->pb_from == Cm.cm_myproc)
        !            84:                        setbit(PB_EOF, ppb->pb_stat);
        !            85:                call_fn(s->st_v.st_loc.st_funcno, pc, pv);
        !            86:                rtval = s->st_v.st_loc.st_next;
        !            87:                break;
        !            88: 
        !            89:          default:
        !            90:                syserr("do_st: type %d", s->st_type);
        !            91:        }
        !            92: 
        !            93: # ifdef xCTR1
        !            94:        if (tTf(2, 10))
        !            95:                lprintf("do_st: ret %d mark %d\n", rtval, markbuf(Qbuf));
        !            96: # endif
        !            97:        return (rtval);
        !            98: }

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