1 /* $OpenBSD: mplock.h,v 1.14 2024/07/03 01:36:50 jsg Exp $ */ 2 3 /* 4 * Copyright (c) 2004 Niklas Hallqvist. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following 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 27 #ifndef _MPLOCK_H_ 28 #define _MPLOCK_H_ 29 30 #include <machine/mplock.h> 31 32 #ifdef __USE_MI_MPLOCK 33 34 #include <sys/_lock.h> 35 36 struct __mp_lock_cpu { 37 u_int mplc_ticket; 38 u_int mplc_depth; 39 }; 40 41 struct __mp_lock { 42 struct __mp_lock_cpu mpl_cpus[MAXCPUS]; 43 volatile u_int mpl_ticket; 44 u_int mpl_users; 45 #ifdef WITNESS 46 struct lock_object mpl_lock_obj; 47 #endif 48 }; 49 50 void ___mp_lock_init(struct __mp_lock *, const struct lock_type *); 51 void __mp_lock(struct __mp_lock *); 52 void __mp_unlock(struct __mp_lock *); 53 int __mp_release_all(struct __mp_lock *); 54 void __mp_acquire_count(struct __mp_lock *, int); 55 int __mp_lock_held(struct __mp_lock *, struct cpu_info *); 56 57 #ifdef WITNESS 58 59 #define __mp_lock_init(mpl) do { \ 60 static const struct lock_type __lock_type = { .lt_name = #mpl };\ 61 ___mp_lock_init((mpl), &__lock_type); \ 62 } while (0) 63 64 #else /* WITNESS */ 65 66 #define __mp_lock_init(mpl) ___mp_lock_init((mpl), NULL) 67 68 #endif /* WITNESS */ 69 70 #endif /* __USE_MI_MPLOCK */ 71 72 extern struct __mp_lock kernel_lock; 73 74 #endif /* !_MPLOCK_H */ 75