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