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  * Copyright (c) 2007 Stephan Uphoff <ups@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the author nor the names of any co-contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: releng/11.0/sys/sys/_rmlock.h 252209 2013-06-25 18:44:15Z jhb $
   30  */
   31 
   32 #ifndef _SYS__RMLOCK_H_
   33 #define _SYS__RMLOCK_H_
   34 
   35 /*
   36  * Mostly reader/occasional writer lock.
   37  */
   38 
   39 LIST_HEAD(rmpriolist,rm_priotracker);
   40 
   41 struct rm_queue {
   42         struct rm_queue *volatile rmq_next;
   43         struct rm_queue *volatile rmq_prev;
   44 };
   45 
   46 struct rmlock {
   47         struct lock_object lock_object;
   48         volatile cpuset_t rm_writecpus;
   49         LIST_HEAD(,rm_priotracker) rm_activeReaders;
   50         union {
   51                 struct lock_object _rm_wlock_object;
   52                 struct mtx _rm_lock_mtx;
   53                 struct sx _rm_lock_sx;
   54         } _rm_lock;
   55 };
   56 
   57 #define rm_wlock_object _rm_lock._rm_wlock_object
   58 #define rm_lock_mtx     _rm_lock._rm_lock_mtx
   59 #define rm_lock_sx      _rm_lock._rm_lock_sx
   60 
   61 struct rm_priotracker {
   62         struct rm_queue rmp_cpuQueue; /* Must be first */
   63         struct rmlock *rmp_rmlock;
   64         struct thread *rmp_thread;
   65         int rmp_flags;
   66         LIST_ENTRY(rm_priotracker) rmp_qentry;
   67 };
   68 
   69 #endif /* !_SYS__RMLOCK_H_ */

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