1 /*- 2 * Copyright (c) 2005 David Xu <davidxu@freebsd.org> 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, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #ifndef _THR_FBSD_UMTX_H_ 30 #define _THR_FBSD_UMTX_H_ 31 32 #include <sys/umtx.h> 33 34 typedef long umtx_t; 35 36 int __thr_umtx_lock(volatile umtx_t *mtx, long id) __hidden; 37 int __thr_umtx_timedlock(volatile umtx_t *mtx, long id, 38 const struct timespec *timeout) __hidden; 39 int __thr_umtx_unlock(volatile umtx_t *mtx, long id) __hidden; 40 41 static inline void 42 _thr_umtx_init(volatile umtx_t *mtx) 43 { 44 *mtx = 0; 45 } 46 47 static inline int 48 _thr_umtx_trylock(volatile umtx_t *mtx, long id) 49 { 50 if (atomic_cmpset_acq_ptr((volatile uintptr_t *)mtx, 51 (uintptr_t)UMTX_UNOWNED, (uintptr_t)id)) 52 return (0); 53 return (EBUSY); 54 } 55 56 static inline int 57 _thr_umtx_lock(volatile umtx_t *mtx, long id) 58 { 59 if (atomic_cmpset_acq_ptr((volatile uintptr_t *)mtx, 60 (uintptr_t)UMTX_UNOWNED, (uintptr_t)id)) 61 return (0); 62 return (__thr_umtx_lock(mtx, id)); 63 } 64 65 static inline int 66 _thr_umtx_timedlock(volatile umtx_t *mtx, long id, 67 const struct timespec *timeout) 68 { 69 if (atomic_cmpset_acq_ptr((volatile uintptr_t *)mtx, 70 (uintptr_t)UMTX_UNOWNED, (uintptr_t)id)) 71 return (0); 72 return (__thr_umtx_timedlock(mtx, id, timeout)); 73 } 74 75 static inline int 76 _thr_umtx_unlock(volatile umtx_t *mtx, long id) 77 { 78 if (atomic_cmpset_rel_ptr((volatile uintptr_t *)mtx, 79 (uintptr_t)id, (uintptr_t)UMTX_UNOWNED)) 80 return (0); 81 return __thr_umtx_unlock(mtx, id); 82 } 83 84 int _thr_umtx_wait(volatile umtx_t *mtx, umtx_t exp, 85 const struct timespec *timeout) __hidden; 86 int _thr_umtx_wake(volatile umtx_t *mtx, int count) __hidden; 87 #endif 88