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/_mutex.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. Berkeley Software Design Inc's name may not be used to endorse or
   15  *    promote products derived from this software without specific prior
   16  *    written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  * $FreeBSD: stable/12/sys/sys/_mutex.h 326256 2017-11-27 15:01:59Z pfg $
   31  */
   32 
   33 #ifndef _SYS__MUTEX_H_
   34 #define _SYS__MUTEX_H_
   35 
   36 #include <machine/param.h>
   37 
   38 /*
   39  * Sleep/spin mutex.
   40  *
   41  * All mutex implementations must always have a member called mtx_lock.
   42  * Other locking primitive structures are not allowed to use this name
   43  * for their members.
   44  * If this rule needs to change, the bits in the mutex implementation must
   45  * be modified appropriately.
   46  */
   47 struct mtx {
   48         struct lock_object      lock_object;    /* Common lock properties. */
   49         volatile uintptr_t      mtx_lock;       /* Owner and flags. */
   50 };
   51 
   52 /*
   53  * Members of struct mtx_padalign must mirror members of struct mtx.
   54  * mtx_padalign mutexes can use the mtx(9) API transparently without
   55  * modification.
   56  * Pad-aligned mutexes used within structures should generally be the
   57  * first member of the struct.  Otherwise, the compiler can generate
   58  * additional padding for the struct to keep a correct alignment for
   59  * the mutex.
   60  */
   61 struct mtx_padalign {
   62         struct lock_object      lock_object;    /* Common lock properties. */
   63         volatile uintptr_t      mtx_lock;       /* Owner and flags. */
   64 } __aligned(CACHE_LINE_SIZE);
   65 
   66 #endif /* !_SYS__MUTEX_H_ */

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