1 /*- 2 * Copyright (c) 2015 Mellanox Technologies, Ltd. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 #ifndef _LINUX_SRCU_H_ 29 #define _LINUX_SRCU_H_ 30 31 #include <sys/param.h> 32 #include <sys/lock.h> 33 #include <sys/sx.h> 34 35 struct srcu_struct { 36 struct sx sx; 37 }; 38 39 static inline int 40 init_srcu_struct(struct srcu_struct *srcu) 41 { 42 sx_init(&srcu->sx, "SleepableRCU"); 43 return (0); 44 } 45 46 static inline void 47 cleanup_srcu_struct(struct srcu_struct *srcu) 48 { 49 sx_destroy(&srcu->sx); 50 } 51 52 static inline int 53 srcu_read_lock(struct srcu_struct *srcu) 54 { 55 sx_slock(&srcu->sx); 56 return (0); 57 } 58 59 static inline void 60 srcu_read_unlock(struct srcu_struct *srcu, int key) 61 { 62 sx_sunlock(&srcu->sx); 63 } 64 65 static inline void 66 synchronize_srcu(struct srcu_struct *srcu) 67 { 68 sx_xlock(&srcu->sx); 69 sx_xunlock(&srcu->sx); 70 } 71 72 #endif /* _LINUX_SRCU_H_ */ 73