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- /*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
- /*-
- * Copyright (c) 1991, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)tp_seq.h 8.1 (Berkeley) 6/10/93
- */
-
- /***********************************************************
- Copyright IBM Corporation 1987
-
- All Rights Reserved
-
- Permission to use, copy, modify, and distribute this software and its
- documentation for any purpose and without fee is hereby granted,
- provided that the above copyright notice appear in all copies and that
- both that copyright notice and this permission notice appear in
- supporting documentation, and that the name of IBM not be
- used in advertising or publicity pertaining to distribution of the
- software without specific, written prior permission.
-
- IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
- ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
- IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
- ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
- WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
- ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
- SOFTWARE.
-
- ******************************************************************/
-
- /*
- * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
- */
- /*
- * ARGO TP
- *
- * These macros perform sequence number arithmetic modulo (2**7 or 2**31).
- * The relevant fields in the tpcb are:
- * tp_seqmask : the mask of bits that define the sequence space.
- * tp_seqbit : 1 + tp_seqmask
- * tp_seqhalf : tp_seqbit / 2 or half the sequence space (rounded up)
- * Not exactly fast, but at least it's maintainable.
- */
-
- #ifndef __TP_SEQ__
- #define __TP_SEQ__
-
- #define SEQ(tpcb,x) \
- ((x) & (tpcb)->tp_seqmask)
-
- #define SEQ_GT(tpcb, seq, operand ) \
- ( ((int)((seq)-(operand)) > 0)\
- ? ((int)((seq)-(operand)) < (int)(tpcb)->tp_seqhalf)\
- : !(-((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf))
-
- #define SEQ_GEQ(tpcb, seq, operand ) \
- ( ((int)((seq)-(operand)) >= 0)\
- ? ((int)((seq)-(operand)) < (int)(tpcb)->tp_seqhalf)\
- : !((-((int)(seq)-(operand))) < (int)(tpcb)->tp_seqhalf))
-
- #define SEQ_LEQ(tpcb, seq, operand ) \
- ( ((int)((seq)-(operand)) <= 0)\
- ? ((-(int)((seq)-(operand))) < (int)(tpcb)->tp_seqhalf)\
- : !(((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf))
-
- #define SEQ_LT(tpcb, seq, operand ) \
- ( ((int)((seq)-(operand)) < 0)\
- ? ((-(int)((seq)-(operand))) < (int)(tpcb)->tp_seqhalf)\
- : !(((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf))
-
- #define SEQ_MIN(tpcb, a, b) ( SEQ_GT(tpcb, a, b) ? b : a)
-
- #define SEQ_MAX(tpcb, a, b) ( SEQ_GT(tpcb, a, b) ? a : b)
-
- #define SEQ_INC(tpcb, Seq) ((++Seq), ((Seq) &= (tpcb)->tp_seqmask))
-
- #define SEQ_DEC(tpcb, Seq)\
- ((Seq) = (((Seq)+(unsigned)((int)(tpcb)->tp_seqbit - 1))&(tpcb)->tp_seqmask))
-
- /* (amt) had better be less than the seq bit ! */
-
- #define SEQ_SUB(tpcb, Seq, amt)\
- (((Seq) + (unsigned)((int)(tpcb)->tp_seqbit - amt)) & (tpcb)->tp_seqmask)
- #define SEQ_ADD(tpcb, Seq, amt) (((Seq) + (unsigned)amt) & (tpcb)->tp_seqmask)
-
-
- #define IN_RWINDOW(tpcb, seq, lwe, uwe)\
- ( SEQ_GEQ(tpcb, seq, lwe) && SEQ_LT(tpcb, seq, uwe) )
-
- #define IN_SWINDOW(tpcb, seq, lwe, uwe)\
- ( SEQ_GT(tpcb, seq, lwe) && SEQ_LEQ(tpcb, seq, uwe) )
-
- #endif /* __TP_SEQ__ */
-