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1 | /*- |
2 | * Copyright (c) 1991 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * %sccs.include.redist.c% | |
6 | * | |
4d8170e5 | 7 | * @(#)tp_seq.h 7.6 (Berkeley) %G% |
7bcd1bb8 KB |
8 | */ |
9 | ||
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10 | /*********************************************************** |
11 | Copyright IBM Corporation 1987 | |
12 | ||
13 | All Rights Reserved | |
14 | ||
15 | Permission to use, copy, modify, and distribute this software and its | |
16 | documentation for any purpose and without fee is hereby granted, | |
17 | provided that the above copyright notice appear in all copies and that | |
18 | both that copyright notice and this permission notice appear in | |
19 | supporting documentation, and that the name of IBM not be | |
20 | used in advertising or publicity pertaining to distribution of the | |
21 | software without specific, written prior permission. | |
22 | ||
23 | IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING | |
24 | ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL | |
25 | IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR | |
26 | ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, | |
27 | WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, | |
28 | ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS | |
29 | SOFTWARE. | |
30 | ||
31 | ******************************************************************/ | |
32 | ||
33 | /* | |
34 | * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison | |
35 | */ | |
36 | /* | |
37 | * ARGO TP | |
38 | * | |
39 | * $Header: tp_seq.h,v 5.1 88/10/12 12:20:59 root Exp $ | |
40 | * $Source: /usr/argo/sys/netiso/RCS/tp_seq.h,v $ | |
41 | * | |
42 | * These macros perform sequence number arithmetic modulo (2**7 or 2**31). | |
43 | * The relevant fields in the tpcb are: | |
44 | * tp_seqmask : the mask of bits that define the sequence space. | |
45 | * tp_seqbit : 1 + tp_seqmask | |
46 | * tp_seqhalf : tp_seqbit / 2 or half the sequence space (rounded up) | |
47 | * Not exactly fast, but at least it's maintainable. | |
48 | */ | |
49 | ||
50 | #ifndef __TP_SEQ__ | |
51 | #define __TP_SEQ__ | |
52 | ||
53 | #define SEQ(tpcb,x) \ | |
54 | ((x) & (tpcb)->tp_seqmask) | |
55 | ||
56 | #define SEQ_GT(tpcb, seq, operand ) \ | |
57 | ( ((int)((seq)-(operand)) > 0)\ | |
58 | ? ((int)((seq)-(operand)) < (int)(tpcb)->tp_seqhalf)\ | |
59 | : !(-((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf)) | |
60 | ||
61 | #define SEQ_GEQ(tpcb, seq, operand ) \ | |
62 | ( ((int)((seq)-(operand)) >= 0)\ | |
63 | ? ((int)((seq)-(operand)) < (int)(tpcb)->tp_seqhalf)\ | |
64 | : !((-((int)(seq)-(operand))) < (int)(tpcb)->tp_seqhalf)) | |
65 | ||
66 | #define SEQ_LEQ(tpcb, seq, operand ) \ | |
67 | ( ((int)((seq)-(operand)) <= 0)\ | |
68 | ? ((-(int)((seq)-(operand))) < (int)(tpcb)->tp_seqhalf)\ | |
69 | : !(((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf)) | |
70 | ||
71 | #define SEQ_LT(tpcb, seq, operand ) \ | |
72 | ( ((int)((seq)-(operand)) < 0)\ | |
73 | ? ((-(int)((seq)-(operand))) < (int)(tpcb)->tp_seqhalf)\ | |
74 | : !(((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf)) | |
75 | ||
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76 | #define SEQ_MIN(tpcb, a, b) ( SEQ_GT(tpcb, a, b) ? b : a) |
77 | ||
78 | #define SEQ_MAX(tpcb, a, b) ( SEQ_GT(tpcb, a, b) ? a : b) | |
79 | ||
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80 | #define SEQ_INC(tpcb, Seq) ((++Seq), ((Seq) &= (tpcb)->tp_seqmask)) |
81 | ||
82 | #define SEQ_DEC(tpcb, Seq)\ | |
83 | ((Seq) = (((Seq)+(unsigned)((int)(tpcb)->tp_seqbit - 1))&(tpcb)->tp_seqmask)) | |
84 | ||
85 | /* (amt) had better be less than the seq bit ! */ | |
86 | ||
87 | #define SEQ_SUB(tpcb, Seq, amt)\ | |
88 | (((Seq) + (unsigned)((int)(tpcb)->tp_seqbit - amt)) & (tpcb)->tp_seqmask) | |
89 | #define SEQ_ADD(tpcb, Seq, amt) (((Seq) + (unsigned)amt) & (tpcb)->tp_seqmask) | |
90 | ||
91 | ||
92 | #define IN_RWINDOW(tpcb, seq, lwe, uwe)\ | |
93 | ( SEQ_GEQ(tpcb, seq, lwe) && SEQ_LT(tpcb, seq, uwe) ) | |
94 | ||
95 | #define IN_SWINDOW(tpcb, seq, lwe, uwe)\ | |
96 | ( SEQ_GT(tpcb, seq, lwe) && SEQ_LEQ(tpcb, seq, uwe) ) | |
97 | ||
4d8170e5 | 98 | #endif /* __TP_SEQ__ */ |