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Annotation of kernel/bsd/sys/lockf.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
        !            26: /*
        !            27:  * Copyright (c) 1991, 1993
        !            28:  *     The Regents of the University of California.  All rights reserved.
        !            29:  *
        !            30:  * This code is derived from software contributed to Berkeley by
        !            31:  * Scooter Morris at Genentech Inc.
        !            32:  *
        !            33:  * Redistribution and use in source and binary forms, with or without
        !            34:  * modification, are permitted provided that the following conditions
        !            35:  * are met:
        !            36:  * 1. Redistributions of source code must retain the above copyright
        !            37:  *    notice, this list of conditions and the following disclaimer.
        !            38:  * 2. Redistributions in binary form must reproduce the above copyright
        !            39:  *    notice, this list of conditions and the following disclaimer in the
        !            40:  *    documentation and/or other materials provided with the distribution.
        !            41:  * 3. All advertising materials mentioning features or use of this software
        !            42:  *    must display the following acknowledgement:
        !            43:  *     This product includes software developed by the University of
        !            44:  *     California, Berkeley and its contributors.
        !            45:  * 4. Neither the name of the University nor the names of its contributors
        !            46:  *    may be used to endorse or promote products derived from this software
        !            47:  *    without specific prior written permission.
        !            48:  *
        !            49:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            50:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            51:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            52:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            53:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            54:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            55:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            56:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            57:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            58:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            59:  * SUCH DAMAGE.
        !            60:  *
        !            61:  *     @(#)lockf.h     8.2 (Berkeley) 10/26/94
        !            62:  */
        !            63: 
        !            64: #ifndef _SYS_LOCKF_H_
        !            65: #define        _SYS_LOCKF_H_
        !            66: 
        !            67: /*
        !            68:  * The lockf structure is a kernel structure which contains the information
        !            69:  * associated with a byte range lock.  The lockf structures are linked into
        !            70:  * the inode structure. Locks are sorted by the starting byte of the lock for
        !            71:  * efficiency.
        !            72:  */
        !            73: struct lockf {
        !            74:        short   lf_flags;        /* Lock semantics: F_POSIX, F_FLOCK, F_WAIT */
        !            75:        short   lf_type;         /* Lock type: F_RDLCK, F_WRLCK */
        !            76:        off_t   lf_start;        /* The byte # of the start of the lock */
        !            77:        off_t   lf_end;          /* The byte # of the end of the lock (-1=EOF)*/
        !            78:        caddr_t lf_id;           /* The id of the resource holding the lock */
        !            79:        struct  lockf **lf_head; /* Back pointer to the head of lockf list */
        !            80:        struct  lockf *lf_next;  /* A pointer to the next lock on this inode */
        !            81:        struct  lockf *lf_block; /* The list of blocked locks */
        !            82: };
        !            83: 
        !            84: /* Maximum length of sleep chains to traverse to try and detect deadlock. */
        !            85: #define MAXDEPTH 50
        !            86: 
        !            87: __BEGIN_DECLS
        !            88: void    lf_addblock __P((struct lockf *, struct lockf *));
        !            89: int     lf_advlock __P((struct lockf **,
        !            90:            off_t, caddr_t, int, struct flock *, int));
        !            91: int     lf_clearlock __P((struct lockf *));
        !            92: int     lf_findoverlap __P((struct lockf *,
        !            93:            struct lockf *, int, struct lockf ***, struct lockf **));
        !            94: struct lockf *
        !            95:         lf_getblock __P((struct lockf *));
        !            96: int     lf_getlock __P((struct lockf *, struct flock *));
        !            97: int     lf_setlock __P((struct lockf *));
        !            98: void    lf_split __P((struct lockf *, struct lockf *));
        !            99: void    lf_wakelock __P((struct lockf *));
        !           100: __END_DECLS
        !           101: 
        !           102: #if LOCKF_DEBUG
        !           103: extern int lockf_debug;
        !           104: 
        !           105: __BEGIN_DECLS
        !           106: void   lf_print __P((char *, struct lockf *));
        !           107: void   lf_printlist __P((char *, struct lockf *));
        !           108: __END_DECLS
        !           109: #endif /* LOCKF_DEBUG */
        !           110: #endif /* !_SYS_LOCKF_H_ */

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