1 /* $NetBSD: lock.h,v 1.5 2017/10/23 06:43:00 msaitoh Exp $ */ 2 3 /*- 4 * Copyright (c) 2007 Jared D. McNeill <jmcneill@invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #ifndef _ARCH_USERMODE_INCLUDE_LOCK_H 30 #define _ARCH_USERMODE_INCLUDE_LOCK_H 31 32 __inline static void 33 __cpu_simple_lock_init(__cpu_simple_lock_t *lockp) 34 { 35 *lockp = __SIMPLELOCK_UNLOCKED; 36 } 37 38 __inline static int 39 __cpu_simple_lock_try(__cpu_simple_lock_t *lockp) 40 { 41 if (*lockp == __SIMPLELOCK_LOCKED) 42 return 0; 43 *lockp = __SIMPLELOCK_LOCKED; 44 return 1; 45 } 46 47 __inline static void 48 __cpu_simple_lock(__cpu_simple_lock_t *lockp) 49 { 50 while (!__cpu_simple_lock_try(lockp)) 51 ; 52 } 53 54 __inline static void 55 __cpu_simple_unlock(__cpu_simple_lock_t *lockp) 56 { 57 *lockp = __SIMPLELOCK_UNLOCKED; 58 } 59 60 __inline static int 61 __SIMPLELOCK_LOCKED_P(const __cpu_simple_lock_t *lockp) 62 { 63 return *lockp == __SIMPLELOCK_LOCKED; 64 } 65 66 __inline static int 67 __SIMPLELOCK_UNLOCKED_P(const __cpu_simple_lock_t *lockp) 68 { 69 return *lockp == __SIMPLELOCK_UNLOCKED; 70 } 71 72 #endif /* !_ARCH_USERMODE_INCLUDE_LOCK_H */ 73