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/5.3/sys/sys/_mutex.h 136588 2004-10-16 08:43:07Z cvs2svn $
   29  */
   30 
   31 #ifndef _SYS__MUTEX_H_
   32 #define _SYS__MUTEX_H_
   33 
   34 /*
   35  * Sleep/spin mutex.
   36  */
   37 struct mtx {
   38         struct lock_object      mtx_object;     /* Common lock properties. */
   39         volatile uintptr_t      mtx_lock;       /* Owner and flags. */
   40         volatile u_int          mtx_recurse;    /* Number of recursive holds. */
   41 
   42 #ifdef MUTEX_PROFILING
   43         /*
   44          * This does not result in variant structure sizes because
   45          * MUTEX_PROFILING is in opt_global.h
   46          */
   47         u_int64_t               mtx_acqtime;
   48         const char              *mtx_filename;
   49         int                     mtx_lineno;
   50         /*
   51          * Fields relating to measuring contention on mutexes.
   52          * holding must be accessed atomically since it's
   53          * modified by threads that don't yet hold the mutex.
   54          * locking is only modified and referenced while
   55          * the mutex is held.
   56          */
   57         u_int                   mtx_contest_holding;
   58         u_int                   mtx_contest_locking;
   59 #endif
   60 };
   61 
   62 #endif /* !_SYS__MUTEX_H_ */

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