lock.h revision 1.1.2.4
1 1.1.2.4 sommerfe /* $NetBSD: lock.h,v 1.1.2.4 2001/01/07 18:21:55 sommerfeld Exp $ */ 2 1.1.2.1 sommerfe 3 1.1.2.1 sommerfe /*- 4 1.1.2.2 sommerfe * Copyright (c) 2000 The NetBSD Foundation, Inc. 5 1.1.2.1 sommerfe * All rights reserved. 6 1.1.2.1 sommerfe * 7 1.1.2.1 sommerfe * This code is derived from software contributed to The NetBSD Foundation 8 1.1.2.2 sommerfe * by Jason R. Thorpe. 9 1.1.2.1 sommerfe * 10 1.1.2.1 sommerfe * Redistribution and use in source and binary forms, with or without 11 1.1.2.1 sommerfe * modification, are permitted provided that the following conditions 12 1.1.2.1 sommerfe * are met: 13 1.1.2.1 sommerfe * 1. Redistributions of source code must retain the above copyright 14 1.1.2.1 sommerfe * notice, this list of conditions and the following disclaimer. 15 1.1.2.1 sommerfe * 2. Redistributions in binary form must reproduce the above copyright 16 1.1.2.1 sommerfe * notice, this list of conditions and the following disclaimer in the 17 1.1.2.1 sommerfe * documentation and/or other materials provided with the distribution. 18 1.1.2.1 sommerfe * 3. All advertising materials mentioning features or use of this software 19 1.1.2.1 sommerfe * must display the following acknowledgement: 20 1.1.2.1 sommerfe * This product includes software developed by the NetBSD 21 1.1.2.1 sommerfe * Foundation, Inc. and its contributors. 22 1.1.2.1 sommerfe * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.1.2.1 sommerfe * contributors may be used to endorse or promote products derived 24 1.1.2.1 sommerfe * from this software without specific prior written permission. 25 1.1.2.1 sommerfe * 26 1.1.2.1 sommerfe * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.1.2.1 sommerfe * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.1.2.1 sommerfe * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.1.2.1 sommerfe * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.1.2.1 sommerfe * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.1.2.1 sommerfe * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.1.2.1 sommerfe * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.1.2.1 sommerfe * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.1.2.1 sommerfe * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.1.2.1 sommerfe * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.1.2.1 sommerfe * POSSIBILITY OF SUCH DAMAGE. 37 1.1.2.1 sommerfe */ 38 1.1.2.1 sommerfe 39 1.1.2.1 sommerfe /* 40 1.1.2.1 sommerfe * Machine-dependent spin lock operations. 41 1.1.2.1 sommerfe */ 42 1.1.2.1 sommerfe 43 1.1.2.2 sommerfe #ifndef _I386_LOCK_H_ 44 1.1.2.2 sommerfe #define _I386_LOCK_H_ 45 1.1.2.2 sommerfe 46 1.1.2.3 sommerfe #if defined(_KERNEL) && !defined(_LKM) 47 1.1.2.2 sommerfe #include "opt_lockdebug.h" 48 1.1.2.3 sommerfe #endif 49 1.1.2.2 sommerfe 50 1.1.2.2 sommerfe typedef __volatile int __cpu_simple_lock_t; 51 1.1.2.2 sommerfe 52 1.1.2.2 sommerfe #define __SIMPLELOCK_LOCKED 1 53 1.1.2.2 sommerfe #define __SIMPLELOCK_UNLOCKED 0 54 1.1.2.2 sommerfe 55 1.1.2.2 sommerfe #ifdef LOCKDEBUG 56 1.1.2.2 sommerfe 57 1.1.2.2 sommerfe extern void __cpu_simple_lock_init __P((__cpu_simple_lock_t *)); 58 1.1.2.2 sommerfe extern void __cpu_simple_lock __P((__cpu_simple_lock_t *)); 59 1.1.2.2 sommerfe extern int __cpu_simple_lock_try __P((__cpu_simple_lock_t *)); 60 1.1.2.2 sommerfe extern void __cpu_simple_unlock __P((__cpu_simple_lock_t *)); 61 1.1.2.2 sommerfe 62 1.1.2.2 sommerfe #else 63 1.1.2.2 sommerfe 64 1.1.2.4 sommerfe #include <machine/atomic.h> 65 1.1.2.4 sommerfe 66 1.1.2.2 sommerfe static __inline void __cpu_simple_lock_init __P((__cpu_simple_lock_t *)) 67 1.1.2.2 sommerfe __attribute__((__unused__)); 68 1.1.2.2 sommerfe static __inline void __cpu_simple_lock __P((__cpu_simple_lock_t *)) 69 1.1.2.2 sommerfe __attribute__((__unused__)); 70 1.1.2.2 sommerfe static __inline int __cpu_simple_lock_try __P((__cpu_simple_lock_t *)) 71 1.1.2.2 sommerfe __attribute__((__unused__)); 72 1.1.2.2 sommerfe static __inline void __cpu_simple_unlock __P((__cpu_simple_lock_t *)) 73 1.1.2.2 sommerfe __attribute__((__unused__)); 74 1.1.2.2 sommerfe 75 1.1.2.2 sommerfe static __inline void 76 1.1.2.4 sommerfe __cpu_simple_lock_init(__cpu_simple_lock_t *lockp) 77 1.1.2.2 sommerfe { 78 1.1.2.4 sommerfe *lockp = __SIMPLELOCK_UNLOCKED; 79 1.1.2.2 sommerfe } 80 1.1.2.2 sommerfe 81 1.1.2.2 sommerfe static __inline void 82 1.1.2.4 sommerfe __cpu_simple_lock(__cpu_simple_lock_t *lockp) 83 1.1.2.2 sommerfe { 84 1.1.2.4 sommerfe while (i386_atomic_testset_i(lockp, __SIMPLELOCK_LOCKED) 85 1.1.2.4 sommerfe == __SIMPLELOCK_LOCKED) { 86 1.1.2.4 sommerfe continue; /* spin */ 87 1.1.2.4 sommerfe } 88 1.1.2.2 sommerfe } 89 1.1.2.2 sommerfe 90 1.1.2.2 sommerfe static __inline int 91 1.1.2.4 sommerfe __cpu_simple_lock_try(__cpu_simple_lock_t *lockp) 92 1.1.2.2 sommerfe { 93 1.1.2.4 sommerfe return (i386_atomic_testset_i(lockp, __SIMPLELOCK_LOCKED) 94 1.1.2.4 sommerfe == __SIMPLELOCK_UNLOCKED); 95 1.1.2.2 sommerfe } 96 1.1.2.2 sommerfe 97 1.1.2.2 sommerfe void 98 1.1.2.4 sommerfe __cpu_simple_unlock(__cpu_simple_lock_t *lockp) 99 1.1.2.2 sommerfe { 100 1.1.2.2 sommerfe 101 1.1.2.4 sommerfe *lockp = __SIMPLELOCK_UNLOCKED; 102 1.1.2.2 sommerfe } 103 1.1.2.2 sommerfe 104 1.1.2.2 sommerfe #endif /* !LOCKDEBUG */ 105 1.1.2.2 sommerfe 106 1.1.2.2 sommerfe #endif /* _I386_LOCK_H_ */ 107
Indexes created Sun Oct 26 13:09:57 GMT 2025