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Annotation of ntddk/src/network/streams/in_wsrv.c, revision 1.1

1.1     ! root        1: /*++
        !             2: 
        !             3: Copyright (c) 1991  Microsoft Corporation
        !             4: 
        !             5: Module Name:
        !             6: 
        !             7:     in_wsrv.c
        !             8: 
        !             9: Abstract:
        !            10: 
        !            11:     This source file contains the write service procedure that is used by
        !            12:     the insulating modules.
        !            13: 
        !            14: --*/
        !            15: 
        !            16: #include "insulate.h"
        !            17: 
        !            18: 
        !            19: 
        !            20: 
        !            21: 
        !            22: int
        !            23: inswsrv(
        !            24:     IN queue_t *wq
        !            25:     )
        !            26: 
        !            27: /*++
        !            28: 
        !            29: Routine Description:
        !            30: 
        !            31:     This is a write service procedure that simply dequeues and passes
        !            32:     messages to the next downstream STREAMS module/driver, subject to
        !            33:     normal flow-control convention.
        !            34: 
        !            35:     It is based on the example in Unix SVR4 Programmers' Guide: STREAMS
        !            36:     (page 8-7).
        !            37: 
        !            38: Arguments:
        !            39: 
        !            40:     wq      -  queue whose service procedure is being run.
        !            41: 
        !            42: Return Value:
        !            43: 
        !            44:     the constant 1.  STREAMS does not specify what the return values
        !            45:     from put and service procedures should be.
        !            46: 
        !            47: --*/
        !            48: 
        !            49: {
        !            50:     mblk_t *mp;
        !            51: 
        !            52:     while (mp = getq(wq)) {
        !            53: 
        !            54:         switch (mp->b_datap->db_type) {
        !            55:         case M_FLUSH:
        !            56:             if (*(mp->b_rptr) & FLUSHW) {
        !            57:                 flushq(wq, FLUSHDATA);
        !            58:             }
        !            59:             putnext(wq, mp);
        !            60:             return(1);
        !            61: 
        !            62:         //
        !            63:         // high-priority messages are not subject to flow-control.
        !            64:         //
        !            65:         default:
        !            66:             if ((mp->b_datap->db_type >= QPCTL) ||
        !            67:                  canput(wq->q_next)) {
        !            68:                     putnext(wq, mp);
        !            69:                     continue;
        !            70:             }
        !            71:             putbq(wq, mp);
        !            72:             return(1);
        !            73:         }
        !            74:     }
        !            75:     return(1);
        !            76: 
        !            77: } // inswsrv

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