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  * Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  * 3. Berkeley Software Design Inc's name may not be used to endorse or
   13  *    promote products derived from this software without specific prior
   14  *    written permission.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: releng/11.1/sys/sys/_mutex.h 242901 2012-11-11 23:25:47Z attilio $
   29  */
   30 
   31 #ifndef _SYS__MUTEX_H_
   32 #define _SYS__MUTEX_H_
   33 
   34 #include <machine/param.h>
   35 
   36 /*
   37  * Sleep/spin mutex.
   38  *
   39  * All mutex implementations must always have a member called mtx_lock.
   40  * Other locking primitive structures are not allowed to use this name
   41  * for their members.
   42  * If this rule needs to change, the bits in the mutex implementation must
   43  * be modified appropriately.
   44  */
   45 struct mtx {
   46         struct lock_object      lock_object;    /* Common lock properties. */
   47         volatile uintptr_t      mtx_lock;       /* Owner and flags. */
   48 };
   49 
   50 /*
   51  * Members of struct mtx_padalign must mirror members of struct mtx.
   52  * mtx_padalign mutexes can use the mtx(9) API transparently without
   53  * modification.
   54  * Pad-aligned mutexes used within structures should generally be the
   55  * first member of the struct.  Otherwise, the compiler can generate
   56  * additional padding for the struct to keep a correct alignment for
   57  * the mutex.
   58  */
   59 struct mtx_padalign {
   60         struct lock_object      lock_object;    /* Common lock properties. */
   61         volatile uintptr_t      mtx_lock;       /* Owner and flags. */
   62 } __aligned(CACHE_LINE_SIZE);
   63 
   64 #endif /* !_SYS__MUTEX_H_ */

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