mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-11-30 04:22:44 +00:00
63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*
|
|
* Copyright (c) 2005 John Baldwin <jhb@FreeBSD.org>
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 THE AUTHOR OR CONTRIBUTORS 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.
|
|
*/
|
|
|
|
#ifndef __REFCNT_H__
|
|
#define __REFCNT_H__
|
|
|
|
#include <machine/atomic.h>
|
|
|
|
#include "pjdlog.h"
|
|
|
|
typedef unsigned int refcnt_t;
|
|
|
|
static __inline void
|
|
refcnt_init(refcnt_t *count, unsigned int v)
|
|
{
|
|
|
|
*count = v;
|
|
}
|
|
|
|
static __inline void
|
|
refcnt_acquire(refcnt_t *count)
|
|
{
|
|
|
|
atomic_add_acq_int(count, 1);
|
|
}
|
|
|
|
static __inline unsigned int
|
|
refcnt_release(refcnt_t *count)
|
|
{
|
|
unsigned int old;
|
|
|
|
/* XXX: Should this have a rel membar? */
|
|
old = atomic_fetchadd_int(count, -1);
|
|
PJDLOG_ASSERT(old > 0);
|
|
return (old - 1);
|
|
}
|
|
|
|
#endif /* ! __REFCNT_H__ */
|