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/* $NetBSD: localcount.h,v 1.5 2017/11/17 09:26:36 ozaki-r Exp $ */
/*-
* Copyright (c) 2016 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Taylor R. Campbell.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 _SYS_LOCALCOUNT_H
#define _SYS_LOCALCOUNT_H
#ifndef _KERNEL
#error <sys/localcount.h> is for kernel consumers only.
#endif
#include <sys/types.h>
struct kcondvar;
struct kmutex;
struct percpu;
struct localcount {
int64_t *lc_totalp;
struct percpu *lc_percpu; /* int64_t */
volatile uint32_t lc_refcnt; /* only for debugging */
};
void localcount_init(struct localcount *);
void localcount_drain(struct localcount *, struct kcondvar *,
struct kmutex *);
void localcount_fini(struct localcount *);
void localcount_acquire(struct localcount *);
void localcount_release(struct localcount *, struct kcondvar *,
struct kmutex *);
uint32_t
localcount_debug_refcnt(const struct localcount *);
#endif /* _SYS_LOCALCOUNT_H */
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