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      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