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 <strings.h> 33 #include <sys/umtx.h> 34 35 #define DEFAULT_UMUTEX {0, 0, {0, 0}, {0, 0, 0, 0}} 36 37 typedef long umtx_t; 38 39 int __thr_umutex_lock(struct umutex *mtx) __hidden; 40 int __thr_umutex_timedlock(struct umutex *mtx, 41 const struct timespec *timeout) __hidden; 42 int __thr_umutex_unlock(struct umutex *mtx) __hidden; 43 int __thr_umutex_trylock(struct umutex *mtx) __hidden; 44 int __thr_umutex_set_ceiling(struct umutex *mtx, uint32_t ceiling, 45 uint32_t *oldceiling) __hidden; 46 47 void _thr_umutex_init(struct umutex *mtx) __hidden; 48 int _thr_umtx_wait(volatile umtx_t *mtx, umtx_t exp, 49 const struct timespec *timeout) __hidden; 50 int _thr_umtx_wake(volatile umtx_t *mtx, int count) __hidden; 51 52 static inline int 53 _thr_umutex_trylock(struct umutex *mtx, uint32_t id) 54 { 55 if (atomic_cmpset_acq_32(&mtx->m_owner, UMUTEX_UNOWNED, id)) 56 return (0); 57 if ((mtx->m_flags & UMUTEX_PRIO_PROTECT) == 0) 58 return (EBUSY); 59 return (__thr_umutex_trylock(mtx)); 60 } 61 62 static inline int 63 _thr_umutex_lock(struct umutex *mtx, uint32_t id) 64 { 65 if (atomic_cmpset_acq_32(&mtx->m_owner, UMUTEX_UNOWNED, id)) 66 return (0); 67 return (__thr_umutex_lock(mtx)); 68 } 69 70 static inline int 71 _thr_umutex_timedlock(struct umutex *mtx, uint32_t id, 72 const struct timespec *timeout) 73 { 74 if (atomic_cmpset_acq_32(&mtx->m_owner, UMUTEX_UNOWNED, id)) 75 return (0); 76 return (__thr_umutex_timedlock(mtx, timeout)); 77 } 78 79 static inline int 80 _thr_umutex_unlock(struct umutex *mtx, uint32_t id) 81 { 82 if (atomic_cmpset_rel_32(&mtx->m_owner, id, UMUTEX_UNOWNED)) 83 return (0); 84 return (__thr_umutex_unlock(mtx)); 85 } 86 87 #endif 88