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/* $OpenBSD: lock.h,v 1.27 2016/06/19 11:54:33 natano Exp $ */
/*
* Copyright (c) 1995
* The Regents of the University of California. All rights reserved.
*
* This code contains ideas from software contributed to Berkeley by
* Avadis Tevanian, Jr., Michael Wayne Young, and the Mach Operating
* System project at Carnegie-Mellon University.
*
* 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. 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.
*
* @(#)lock.h 8.12 (Berkeley) 5/19/95
*/
#ifndef _LOCK_H_
#define _LOCK_H_
#include <sys/rwlock.h>
#define LK_EXCLUSIVE RW_WRITE /* exclusive lock */
#define LK_SHARED RW_READ /* shared lock */
#define LK_TYPE_MASK (RW_WRITE|RW_READ) /* type of lock sought */
#define LK_NOWAIT RW_NOSLEEP /* do not sleep to await lock */
#define LK_RECURSEFAIL RW_RECURSEFAIL /* fail if recursive exclusive lock */
#define LK_EXCLOTHER RW_WRITE_OTHER /* exclusive lock held by some other thread */
#define LK_RWFLAGS (RW_WRITE|RW_READ|RW_NOSLEEP|RW_RECURSEFAIL|RW_WRITE_OTHER)
/* LK_ specific */
#define LK_DRAIN 0x1000UL /* wait for all lock activity to end */
#define LK_RETRY 0x2000UL /* vn_lock: retry until locked */
#endif /* !_LOCK_H_ */
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