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Annotation of 43BSDReno/sys/netiso/tp_seq.h, revision 1.1

1.1     ! root        1: /***********************************************************
        !             2:                Copyright IBM Corporation 1987
        !             3: 
        !             4:                       All Rights Reserved
        !             5: 
        !             6: Permission to use, copy, modify, and distribute this software and its 
        !             7: documentation for any purpose and without fee is hereby granted, 
        !             8: provided that the above copyright notice appear in all copies and that
        !             9: both that copyright notice and this permission notice appear in 
        !            10: supporting documentation, and that the name of IBM not be
        !            11: used in advertising or publicity pertaining to distribution of the
        !            12: software without specific, written prior permission.  
        !            13: 
        !            14: IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
        !            15: ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
        !            16: IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
        !            17: ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
        !            18: WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
        !            19: ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
        !            20: SOFTWARE.
        !            21: 
        !            22: ******************************************************************/
        !            23: 
        !            24: /*
        !            25:  * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
        !            26:  */
        !            27: /* 
        !            28:  * ARGO TP
        !            29:  *
        !            30:  * $Header: tp_seq.h,v 5.1 88/10/12 12:20:59 root Exp $
        !            31:  * $Source: /usr/argo/sys/netiso/RCS/tp_seq.h,v $
        !            32:  *     @(#)tp_seq.h    7.4 (Berkeley) 1/16/90 *
        !            33:  *
        !            34:  * These macros perform sequence number arithmetic modulo (2**7 or 2**31).
        !            35:  * The relevant fields in the tpcb are:
        !            36:  *     tp_seqmask : the mask of bits that define the sequence space.
        !            37:  *     tp_seqbit  : 1 + tp_seqmask
        !            38:  *     tp_seqhalf : tp_seqbit / 2 or half the sequence space (rounded up)
        !            39:  * Not exactly fast, but at least it's maintainable.
        !            40:  */
        !            41: 
        !            42: #ifndef __TP_SEQ__
        !            43: #define __TP_SEQ__
        !            44: 
        !            45: #define SEQ(tpcb,x) \
        !            46:        ((x) & (tpcb)->tp_seqmask)
        !            47: 
        !            48: #define SEQ_GT(tpcb, seq, operand ) \
        !            49: ( ((int)((seq)-(operand)) > 0)\
        !            50: ? ((int)((seq)-(operand)) < (int)(tpcb)->tp_seqhalf)\
        !            51: : !(-((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf))
        !            52: 
        !            53: #define SEQ_GEQ(tpcb, seq, operand ) \
        !            54: ( ((int)((seq)-(operand)) >= 0)\
        !            55: ? ((int)((seq)-(operand)) < (int)(tpcb)->tp_seqhalf)\
        !            56: : !((-((int)(seq)-(operand))) < (int)(tpcb)->tp_seqhalf))
        !            57: 
        !            58: #define SEQ_LEQ(tpcb, seq, operand ) \
        !            59: ( ((int)((seq)-(operand)) <= 0)\
        !            60: ? ((-(int)((seq)-(operand))) < (int)(tpcb)->tp_seqhalf)\
        !            61: : !(((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf))
        !            62: 
        !            63: #define SEQ_LT(tpcb, seq, operand ) \
        !            64: ( ((int)((seq)-(operand)) < 0)\
        !            65: ? ((-(int)((seq)-(operand))) < (int)(tpcb)->tp_seqhalf)\
        !            66: : !(((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf))
        !            67:        
        !            68: #define SEQ_MIN(tpcb, a, b) ( SEQ_GT(tpcb, a, b) ? b : a)
        !            69: 
        !            70: #define SEQ_MAX(tpcb, a, b) ( SEQ_GT(tpcb, a, b) ? a : b)
        !            71: 
        !            72: #define SEQ_INC(tpcb, Seq) ((++Seq), ((Seq) &= (tpcb)->tp_seqmask))
        !            73: 
        !            74: #define SEQ_DEC(tpcb, Seq)\
        !            75:        ((Seq) = (((Seq)+(unsigned)((int)(tpcb)->tp_seqbit - 1))&(tpcb)->tp_seqmask))
        !            76: 
        !            77: /* (amt) had better be less than the seq bit ! */
        !            78: 
        !            79: #define SEQ_SUB(tpcb, Seq, amt)\
        !            80:        (((Seq) + (unsigned)((int)(tpcb)->tp_seqbit - amt)) & (tpcb)->tp_seqmask)
        !            81: #define SEQ_ADD(tpcb, Seq, amt) (((Seq) + (unsigned)amt) & (tpcb)->tp_seqmask)
        !            82: 
        !            83: 
        !            84: #define IN_RWINDOW(tpcb, seq, lwe, uwe)\
        !            85:        ( SEQ_GEQ(tpcb, seq, lwe) && SEQ_LT(tpcb, seq, uwe) )
        !            86: 
        !            87: #define IN_SWINDOW(tpcb, seq, lwe, uwe)\
        !            88:        ( SEQ_GT(tpcb, seq, lwe) && SEQ_LEQ(tpcb, seq, uwe) )
        !            89: 
        !            90: #endif __TP_SEQ__

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