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/*-
* Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Berkeley Software Design Inc's name may not be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _SYS__MUTEX_H_
#define _SYS__MUTEX_H_
/*
* Sleep/spin mutex.
*/
struct mtx {
struct lock_object mtx_object; /* Common lock properties. */
volatile uintptr_t mtx_lock; /* Owner and flags. */
volatile u_int mtx_recurse; /* Number of recursive holds. */
#ifdef MUTEX_PROFILING
/*
* This does not result in variant structure sizes because
* MUTEX_PROFILING is in opt_global.h
*/
u_int64_t mtx_acqtime;
const char *mtx_filename;
int mtx_lineno;
/*
* Fields relating to measuring contention on mutexes.
* holding must be accessed atomically since it's
* modified by threads that don't yet hold the mutex.
* locking is only modified and referenced while
* the mutex is held.
*/
u_int mtx_contest_holding;
u_int mtx_contest_locking;
#endif
};
#endif /* !_SYS__MUTEX_H_ */
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