| 1 | /* $OpenBSD: lock.h,v 1.27 2016/06/19 11:54:33 natano Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1995 |
| 5 | * The Regents of the University of California. All rights reserved. |
| 6 | * |
| 7 | * This code contains ideas from software contributed to Berkeley by |
| 8 | * Avadis Tevanian, Jr., Michael Wayne Young, and the Mach Operating |
| 9 | * System project at Carnegie-Mellon University. |
| 10 | * |
| 11 | * Redistribution and use in source and binary forms, with or without |
| 12 | * modification, are permitted provided that the following conditions |
| 13 | * are met: |
| 14 | * 1. Redistributions of source code must retain the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer. |
| 16 | * 2. Redistributions in binary form must reproduce the above copyright |
| 17 | * notice, this list of conditions and the following disclaimer in the |
| 18 | * documentation and/or other materials provided with the distribution. |
| 19 | * 3. Neither the name of the University nor the names of its contributors |
| 20 | * may be used to endorse or promote products derived from this software |
| 21 | * without specific prior written permission. |
| 22 | * |
| 23 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 33 | * SUCH DAMAGE. |
| 34 | * |
| 35 | * @(#)lock.h 8.12 (Berkeley) 5/19/95 |
| 36 | */ |
| 37 | |
| 38 | #ifndef _LOCK_H_ |
| 39 | #define _LOCK_H_ |
| 40 | |
| 41 | #include <sys/rwlock.h> |
| 42 | |
| 43 | #define LK_EXCLUSIVE RW_WRITE /* exclusive lock */ |
| 44 | #define LK_SHARED RW_READ /* shared lock */ |
| 45 | #define LK_TYPE_MASK (RW_WRITE|RW_READ) /* type of lock sought */ |
| 46 | #define LK_NOWAIT RW_NOSLEEP /* do not sleep to await lock */ |
| 47 | #define LK_RECURSEFAIL RW_RECURSEFAIL /* fail if recursive exclusive lock */ |
| 48 | #define LK_EXCLOTHER RW_WRITE_OTHER /* exclusive lock held by some other thread */ |
| 49 | #define LK_RWFLAGS (RW_WRITE|RW_READ|RW_NOSLEEP|RW_RECURSEFAIL|RW_WRITE_OTHER) |
| 50 | |
| 51 | /* LK_ specific */ |
| 52 | #define LK_DRAIN 0x1000UL /* wait for all lock activity to end */ |
| 53 | #define LK_RETRY 0x2000UL /* vn_lock: retry until locked */ |
| 54 | |
| 55 | #endif /* !_LOCK_H_ */ |