The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/_rmlock.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2007 Stephan Uphoff <ups@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the author nor the names of any co-contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  * $FreeBSD: stable/12/sys/sys/_rmlock.h 326023 2017-11-20 19:43:44Z pfg $
   32  */
   33 
   34 #ifndef _SYS__RMLOCK_H_
   35 #define _SYS__RMLOCK_H_
   36 
   37 /*
   38  * Mostly reader/occasional writer lock.
   39  */
   40 
   41 LIST_HEAD(rmpriolist,rm_priotracker);
   42 
   43 struct rm_queue {
   44         struct rm_queue *volatile rmq_next;
   45         struct rm_queue *volatile rmq_prev;
   46 };
   47 
   48 struct rmlock {
   49         struct lock_object lock_object;
   50         volatile cpuset_t rm_writecpus;
   51         LIST_HEAD(,rm_priotracker) rm_activeReaders;
   52         union {
   53                 struct lock_object _rm_wlock_object;
   54                 struct mtx _rm_lock_mtx;
   55                 struct sx _rm_lock_sx;
   56         } _rm_lock;
   57 };
   58 
   59 #define rm_wlock_object _rm_lock._rm_wlock_object
   60 #define rm_lock_mtx     _rm_lock._rm_lock_mtx
   61 #define rm_lock_sx      _rm_lock._rm_lock_sx
   62 
   63 struct rm_priotracker {
   64         struct rm_queue rmp_cpuQueue; /* Must be first */
   65         struct rmlock *rmp_rmlock;
   66         struct thread *rmp_thread;
   67         int rmp_flags;
   68         LIST_ENTRY(rm_priotracker) rmp_qentry;
   69 };
   70 
   71 #endif /* !_SYS__RMLOCK_H_ */

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