1 /* 2 * Copyright (c) 2007 Artur Grabowski <art@openbsd.org> 3 * 4 * Permission to use, copy, modify, and distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 */ 16 17 #ifndef _MACHINE_MPLOCK_H_ 18 #define _MACHINE_MPLOCK_H_ 19 20 struct __mp_lock_cpu { 21 u_int mplc_ticket; 22 u_int mplc_depth; 23 }; 24 25 struct __mp_lock { 26 struct __mp_lock_cpu mpl_cpus[MAXCPUS]; 27 volatile u_int mpl_ticket; 28 u_int mpl_users; 29 }; 30 31 #ifndef _LOCORE 32 33 void __mp_lock_init(struct __mp_lock *); 34 void __mp_lock(struct __mp_lock *); 35 void __mp_unlock(struct __mp_lock *); 36 int __mp_release_all(struct __mp_lock *); 37 int __mp_release_all_but_one(struct __mp_lock *); 38 void __mp_acquire_count(struct __mp_lock *, int); 39 int __mp_lock_held(struct __mp_lock *); 40 41 #endif 42 43 #endif 44