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/i386/include/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  *      from BSDI $Id: mutex.h,v 2.7.2.35 2000/04/27 03:10:26 cp Exp $
   29  * $FreeBSD: releng/6.1/sys/i386/include/mutex.h 158179 2006-04-30 16:44:43Z cvs2svn $
   30  */
   31 
   32 #ifndef _MACHINE_MUTEX_H_
   33 #define _MACHINE_MUTEX_H_
   34 
   35 #ifndef LOCORE
   36 
   37 #ifdef _KERNEL
   38 
   39 /* Global locks */
   40 extern struct mtx       clock_lock;
   41 
   42 #endif  /* _KERNEL */
   43 
   44 #else   /* !LOCORE */
   45 
   46 /*
   47  * Simple assembly macros to get and release mutexes.
   48  *
   49  * Note: All of these macros accept a "flags" argument and are analoguous
   50  *       to the mtx_lock_flags and mtx_unlock_flags general macros. If one
   51  *       desires to not pass a flag, the value 0 may be passed as second
   52  *       argument.
   53  *
   54  * XXX: We only have MTX_LOCK_SPIN and MTX_UNLOCK_SPIN for now, since that's
   55  *      all we use right now. We should add MTX_LOCK and MTX_UNLOCK (for sleep
   56  *      locks) in the near future, however.
   57  */
   58 #define MTX_LOCK_SPIN(lck, flags)                                       \
   59         pushl $0 ;                                                      \
   60         pushl $0 ;                                                      \
   61         pushl $flags ;                                                  \
   62         pushl $lck ;                                                    \
   63         call _mtx_lock_spin_flags ;                                     \
   64         addl $0x10, %esp ;                                              \
   65 
   66 #define MTX_UNLOCK_SPIN(lck)                                            \
   67         pushl $0 ;                                                      \
   68         pushl $0 ;                                                      \
   69         pushl $0 ;                                                      \
   70         pushl $lck ;                                                    \
   71         call _mtx_unlock_spin_flags ;                                   \
   72         addl $0x10, %esp ;                                              \
   73 
   74 #endif  /* !LOCORE */
   75 #endif  /* __MACHINE_MUTEX_H */

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