The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netiso/tp_seq.h

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    1 /*      $NetBSD: tp_seq.h,v 1.7 2003/08/07 16:33:41 agc Exp $   */
    2 
    3 /*-
    4  * Copyright (c) 1991, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)tp_seq.h    8.1 (Berkeley) 6/10/93
   32  */
   33 
   34 /***********************************************************
   35                 Copyright IBM Corporation 1987
   36 
   37                       All Rights Reserved
   38 
   39 Permission to use, copy, modify, and distribute this software and its
   40 documentation for any purpose and without fee is hereby granted,
   41 provided that the above copyright notice appear in all copies and that
   42 both that copyright notice and this permission notice appear in
   43 supporting documentation, and that the name of IBM not be
   44 used in advertising or publicity pertaining to distribution of the
   45 software without specific, written prior permission.
   46 
   47 IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
   48 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
   49 IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
   50 ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
   51 WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
   52 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
   53 SOFTWARE.
   54 
   55 ******************************************************************/
   56 
   57 /*
   58  * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
   59  */
   60 /*
   61  * These macros perform sequence number arithmetic modulo (2**7 or 2**31).
   62  * The relevant fields in the tpcb are: tp_seqmask : the mask of bits that
   63  * define the sequence space. tp_seqbit  : 1 + tp_seqmask tp_seqhalf :
   64  * tp_seqbit / 2 or half the sequence space (rounded up) Not exactly fast,
   65  * but at least it's maintainable.
   66  */
   67 
   68 #ifndef _NETISO_TP_SEQ_H_
   69 #define _NETISO_TP_SEQ_H_
   70 
   71 #define SEQ(tpcb,x) \
   72         ((x) & (tpcb)->tp_seqmask)
   73 
   74 #define SEQ_GT(tpcb, seq, operand ) \
   75 ( ((int)((seq)-(operand)) > 0)\
   76 ? ((int)((seq)-(operand)) < (int)(tpcb)->tp_seqhalf)\
   77 : !(-((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf))
   78 
   79 #define SEQ_GEQ(tpcb, seq, operand ) \
   80 ( ((int)((seq)-(operand)) >= 0)\
   81 ? ((int)((seq)-(operand)) < (int)(tpcb)->tp_seqhalf)\
   82 : !((-((int)(seq)-(operand))) < (int)(tpcb)->tp_seqhalf))
   83 
   84 #define SEQ_LEQ(tpcb, seq, operand ) \
   85 ( ((int)((seq)-(operand)) <= 0)\
   86 ? ((-(int)((seq)-(operand))) < (int)(tpcb)->tp_seqhalf)\
   87 : !(((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf))
   88 
   89 #define SEQ_LT(tpcb, seq, operand ) \
   90 ( ((int)((seq)-(operand)) < 0)\
   91 ? ((-(int)((seq)-(operand))) < (int)(tpcb)->tp_seqhalf)\
   92 : !(((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf))
   93 
   94 #define SEQ_MIN(tpcb, a, b) ( SEQ_GT(tpcb, a, b) ? b : a)
   95 
   96 #define SEQ_MAX(tpcb, a, b) ( SEQ_GT(tpcb, a, b) ? a : b)
   97 
   98 #define SEQ_INC(tpcb, Seq) ((++Seq), ((Seq) &= (tpcb)->tp_seqmask))
   99 
  100 #define SEQ_DEC(tpcb, Seq)\
  101         ((Seq) = (((Seq)+(unsigned)((int)(tpcb)->tp_seqbit - 1))&(tpcb)->tp_seqmask))
  102 
  103 /* (amt) had better be less than the seq bit ! */
  104 
  105 #define SEQ_SUB(tpcb, Seq, amt)\
  106         (((Seq) + (unsigned)((int)(tpcb)->tp_seqbit - amt)) & (tpcb)->tp_seqmask)
  107 #define SEQ_ADD(tpcb, Seq, amt) (((Seq) + (unsigned)amt) & (tpcb)->tp_seqmask)
  108 
  109 
  110 #define IN_RWINDOW(tpcb, seq, lwe, uwe)\
  111         ( SEQ_GEQ(tpcb, seq, lwe) && SEQ_LT(tpcb, seq, uwe) )
  112 
  113 #define IN_SWINDOW(tpcb, seq, lwe, uwe)\
  114         ( SEQ_GT(tpcb, seq, lwe) && SEQ_LEQ(tpcb, seq, uwe) )
  115 
  116 #endif                          /* _NETISO_TP_SEQ_H_ */

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