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/_rwlock.h

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    1 /*-
    2  * Copyright (c) 2006 John Baldwin <jhb@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  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/10.3/sys/sys/_rwlock.h 262192 2014-02-18 20:27:17Z jhb $
   27  */
   28 
   29 #ifndef _SYS__RWLOCK_H_
   30 #define _SYS__RWLOCK_H_
   31 
   32 #include <machine/param.h>
   33 
   34 /*
   35  * Reader/writer lock.
   36  *
   37  * All reader/writer lock implementations must always have a member
   38  * called rw_lock.  Other locking primitive structures are not allowed to
   39  * use this name for their members.
   40  * If this rule needs to change, the bits in the reader/writer lock
   41  * implementation must be modified appropriately.
   42  */
   43 struct rwlock {
   44         struct lock_object      lock_object;
   45         volatile uintptr_t      rw_lock;
   46 };
   47 
   48 /*
   49  * Members of struct rwlock_padalign must mirror members of struct rwlock.
   50  * rwlock_padalign rwlocks can use the rwlock(9) API transparently without
   51  * modification.
   52  * Pad-aligned rwlocks used within structures should generally be the
   53  * first member of the struct.  Otherwise, the compiler can generate
   54  * additional padding for the struct to keep a correct alignment for
   55  * the rwlock.
   56  */
   57 struct rwlock_padalign {
   58         struct lock_object      lock_object;
   59         volatile uintptr_t      rw_lock;
   60 } __aligned(CACHE_LINE_SIZE);
   61 
   62 #endif /* !_SYS__RWLOCK_H_ */

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