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Annotation of 43BSDReno/sys/netiso/tp_seq.h, revision 1.1.1.1

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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