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/_lock.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  * $FreeBSD$
   29  */
   30 
   31 #ifndef _SYS__LOCK_H_
   32 #define _SYS__LOCK_H_
   33 
   34 struct lock_profile_object {
   35         /*
   36          * This does not result in variant structure sizes because
   37          * MUTEX_PROFILING is in opt_global.h
   38          */
   39         u_int64_t               lpo_acqtime;
   40         u_int64_t               lpo_waittime;
   41         const char              *lpo_filename;
   42         u_int                   lpo_namehash;
   43         int                     lpo_lineno;
   44         const char              *lpo_type;
   45         /*
   46          * Fields relating to measuring contention on mutexes.
   47          * holding must be accessed atomically since it's
   48          * modified by threads that don't yet hold the mutex.
   49          * locking is only modified and referenced while
   50          * the mutex is held.
   51          */
   52         u_int                   lpo_contest_holding;
   53         u_int                   lpo_contest_locking;
   54 };
   55 
   56 struct lock_object {
   57         const   char *lo_name;          /* Individual lock name. */
   58         const   char *lo_type;          /* General lock type. */
   59         u_int   lo_flags;
   60 #ifdef LOCK_PROFILING
   61         struct  lock_profile_object lo_profile_obj;
   62 #endif
   63         union {                         /* Data for witness. */
   64                 STAILQ_ENTRY(lock_object) lod_list;
   65                 struct  witness *lod_witness;
   66         } lo_witness_data;
   67 };
   68 
   69 #endif /* !_SYS__LOCK_H_ */

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