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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2007 Stephan Uphoff <ups@FreeBSD.org>
* All rights reserved.
*
* 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 author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#ifndef _SYS__RMLOCK_H_
#define _SYS__RMLOCK_H_
/*
* Mostly reader/occasional writer lock.
*/
LIST_HEAD(rmpriolist,rm_priotracker);
struct rm_queue {
struct rm_queue *volatile rmq_next;
struct rm_queue *volatile rmq_prev;
};
struct rmlock {
struct lock_object lock_object;
volatile cpuset_t rm_writecpus;
LIST_HEAD(,rm_priotracker) rm_activeReaders;
union {
struct lock_object _rm_wlock_object;
struct mtx _rm_lock_mtx;
struct sx _rm_lock_sx;
} _rm_lock;
};
#define rm_wlock_object _rm_lock._rm_wlock_object
#define rm_lock_mtx _rm_lock._rm_lock_mtx
#define rm_lock_sx _rm_lock._rm_lock_sx
struct rm_priotracker {
struct rm_queue rmp_cpuQueue; /* Must be first */
struct rmlock *rmp_rmlock;
struct thread *rmp_thread;
int rmp_flags;
LIST_ENTRY(rm_priotracker) rmp_qentry;
};
#endif /* !_SYS__RMLOCK_H_ */
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