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