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Annotation of XNU/bsd/netiso/tp_seq.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*-
        !            23:  * Copyright (c) 1991, 1993
        !            24:  *     The Regents of the University of California.  All rights reserved.
        !            25:  *
        !            26:  * Redistribution and use in source and binary forms, with or without
        !            27:  * modification, are permitted provided that the following conditions
        !            28:  * are met:
        !            29:  * 1. Redistributions of source code must retain the above copyright
        !            30:  *    notice, this list of conditions and the following disclaimer.
        !            31:  * 2. Redistributions in binary form must reproduce the above copyright
        !            32:  *    notice, this list of conditions and the following disclaimer in the
        !            33:  *    documentation and/or other materials provided with the distribution.
        !            34:  * 3. All advertising materials mentioning features or use of this software
        !            35:  *    must display the following acknowledgement:
        !            36:  *     This product includes software developed by the University of
        !            37:  *     California, Berkeley and its contributors.
        !            38:  * 4. Neither the name of the University nor the names of its contributors
        !            39:  *    may be used to endorse or promote products derived from this software
        !            40:  *    without specific prior written permission.
        !            41:  *
        !            42:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            43:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            44:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            45:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            46:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            47:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            48:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            49:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            50:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            51:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            52:  * SUCH DAMAGE.
        !            53:  *
        !            54:  *     @(#)tp_seq.h    8.1 (Berkeley) 6/10/93
        !            55:  */
        !            56: 
        !            57: /***********************************************************
        !            58:                Copyright IBM Corporation 1987
        !            59: 
        !            60:                       All Rights Reserved
        !            61: 
        !            62: Permission to use, copy, modify, and distribute this software and its 
        !            63: documentation for any purpose and without fee is hereby granted, 
        !            64: provided that the above copyright notice appear in all copies and that
        !            65: both that copyright notice and this permission notice appear in 
        !            66: supporting documentation, and that the name of IBM not be
        !            67: used in advertising or publicity pertaining to distribution of the
        !            68: software without specific, written prior permission.  
        !            69: 
        !            70: IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
        !            71: ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
        !            72: IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
        !            73: ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
        !            74: WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
        !            75: ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
        !            76: SOFTWARE.
        !            77: 
        !            78: ******************************************************************/
        !            79: 
        !            80: /*
        !            81:  * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
        !            82:  */
        !            83: /* 
        !            84:  * ARGO TP
        !            85:  *
        !            86:  * These macros perform sequence number arithmetic modulo (2**7 or 2**31).
        !            87:  * The relevant fields in the tpcb are:
        !            88:  *     tp_seqmask : the mask of bits that define the sequence space.
        !            89:  *     tp_seqbit  : 1 + tp_seqmask
        !            90:  *     tp_seqhalf : tp_seqbit / 2 or half the sequence space (rounded up)
        !            91:  * Not exactly fast, but at least it's maintainable.
        !            92:  */
        !            93: 
        !            94: #ifndef __TP_SEQ__
        !            95: #define __TP_SEQ__
        !            96: 
        !            97: #define SEQ(tpcb,x) \
        !            98:        ((x) & (tpcb)->tp_seqmask)
        !            99: 
        !           100: #define SEQ_GT(tpcb, seq, operand ) \
        !           101: ( ((int)((seq)-(operand)) > 0)\
        !           102: ? ((int)((seq)-(operand)) < (int)(tpcb)->tp_seqhalf)\
        !           103: : !(-((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf))
        !           104: 
        !           105: #define SEQ_GEQ(tpcb, seq, operand ) \
        !           106: ( ((int)((seq)-(operand)) >= 0)\
        !           107: ? ((int)((seq)-(operand)) < (int)(tpcb)->tp_seqhalf)\
        !           108: : !((-((int)(seq)-(operand))) < (int)(tpcb)->tp_seqhalf))
        !           109: 
        !           110: #define SEQ_LEQ(tpcb, seq, operand ) \
        !           111: ( ((int)((seq)-(operand)) <= 0)\
        !           112: ? ((-(int)((seq)-(operand))) < (int)(tpcb)->tp_seqhalf)\
        !           113: : !(((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf))
        !           114: 
        !           115: #define SEQ_LT(tpcb, seq, operand ) \
        !           116: ( ((int)((seq)-(operand)) < 0)\
        !           117: ? ((-(int)((seq)-(operand))) < (int)(tpcb)->tp_seqhalf)\
        !           118: : !(((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf))
        !           119:        
        !           120: #define SEQ_MIN(tpcb, a, b) ( SEQ_GT(tpcb, a, b) ? b : a)
        !           121: 
        !           122: #define SEQ_MAX(tpcb, a, b) ( SEQ_GT(tpcb, a, b) ? a : b)
        !           123: 
        !           124: #define SEQ_INC(tpcb, Seq) ((++Seq), ((Seq) &= (tpcb)->tp_seqmask))
        !           125: 
        !           126: #define SEQ_DEC(tpcb, Seq)\
        !           127:        ((Seq) = (((Seq)+(unsigned)((int)(tpcb)->tp_seqbit - 1))&(tpcb)->tp_seqmask))
        !           128: 
        !           129: /* (amt) had better be less than the seq bit ! */
        !           130: 
        !           131: #define SEQ_SUB(tpcb, Seq, amt)\
        !           132:        (((Seq) + (unsigned)((int)(tpcb)->tp_seqbit - amt)) & (tpcb)->tp_seqmask)
        !           133: #define SEQ_ADD(tpcb, Seq, amt) (((Seq) + (unsigned)amt) & (tpcb)->tp_seqmask)
        !           134: 
        !           135: 
        !           136: #define IN_RWINDOW(tpcb, seq, lwe, uwe)\
        !           137:        ( SEQ_GEQ(tpcb, seq, lwe) && SEQ_LT(tpcb, seq, uwe) )
        !           138: 
        !           139: #define IN_SWINDOW(tpcb, seq, lwe, uwe)\
        !           140:        ( SEQ_GT(tpcb, seq, lwe) && SEQ_LEQ(tpcb, seq, uwe) )
        !           141: 
        !           142: #endif /* __TP_SEQ__ */

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