1 /* $NetBSD: srcu.h,v 1.4 2021/12/19 11:49:11 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2018 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 _LINUX_SRCU_H_ 33 #define _LINUX_SRCU_H_ 34 35 #include <sys/types.h> 36 #include <sys/condvar.h> 37 #include <sys/mutex.h> 38 39 /* namespace */ 40 #define _init_srcu_struct linux__init_init_srcu_struct 41 #define cleanup_srcu_struct linux_cleanup_srcu_struct 42 #define srcu_read_lock linux_srcu_read_lock 43 #define srcu_read_unlock linux_srcu_read_unlock 44 #define synchronize_srcu linux_synchronize_srcu 45 #define synchronize_srcu_expedited linux_synchronize_srcu_expedited 46 47 struct lwp; 48 struct percpu; 49 50 struct srcu_struct { 51 struct percpu *srcu_percpu; /* struct srcu_cpu */ 52 kmutex_t srcu_lock; 53 kcondvar_t srcu_cv; 54 struct lwp *srcu_sync; 55 int64_t srcu_total; 56 volatile unsigned srcu_gen; 57 }; 58 59 #define init_srcu_struct(S) _init_srcu_struct(S, #S) 60 61 void _init_srcu_struct(struct srcu_struct *, const char *); 62 void cleanup_srcu_struct(struct srcu_struct *); 63 64 int srcu_read_lock(struct srcu_struct *); 65 void srcu_read_unlock(struct srcu_struct *, int); 66 67 void synchronize_srcu(struct srcu_struct *); 68 void synchronize_srcu_expedited(struct srcu_struct *); 69 70 #endif /* _LINUX_SRCU_H_ */ 71