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      1 /*	$NetBSD: localcount.h,v 1.5 2017/11/17 09:26:36 ozaki-r Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2016 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef	_SYS_LOCALCOUNT_H
     33 #define	_SYS_LOCALCOUNT_H
     34 
     35 #ifndef _KERNEL
     36 #error <sys/localcount.h> is for kernel consumers only.
     37 #endif
     38 
     39 #include <sys/types.h>
     40 
     41 struct kcondvar;
     42 struct kmutex;
     43 struct percpu;
     44 
     45 struct localcount {
     46 	int64_t			*lc_totalp;
     47 	struct percpu		*lc_percpu; /* int64_t */
     48 	volatile uint32_t	lc_refcnt; /* only for debugging */
     49 };
     50 
     51 void	localcount_init(struct localcount *);
     52 void	localcount_drain(struct localcount *, struct kcondvar *,
     53 	    struct kmutex *);
     54 void	localcount_fini(struct localcount *);
     55 void	localcount_acquire(struct localcount *);
     56 void	localcount_release(struct localcount *, struct kcondvar *,
     57 	    struct kmutex *);
     58 
     59 uint32_t
     60 	localcount_debug_refcnt(const struct localcount *);
     61 
     62 #endif	/* _SYS_LOCALCOUNT_H */
     63