thr_umtx.h revision 162061
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: head/lib/libthr/thread/thr_umtx.h 162061 2006-09-06 04:04:10Z davidxu $ 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 37typedef long umtx_t; 38 39int __thr_umutex_lock(struct umutex *mtx, uint32_t id) __hidden; 40int __thr_umutex_timedlock(struct umutex *mtx, uint32_t id, 41 const struct timespec *timeout) __hidden; 42int __thr_umutex_unlock(struct umutex *mtx, uint32_t id) __hidden; 43int __thr_umutex_kern_trylock(struct umutex *mtx) __hidden; 44int __thr_umutex_set_ceiling(struct umutex *mtx, uint32_t ceiling, 45 uint32_t *oldceiling) __hidden; 46 47int _thr_umtx_wait(volatile umtx_t *mtx, umtx_t exp, 48 const struct timespec *timeout) __hidden; 49int _thr_umtx_wake(volatile umtx_t *mtx, int count) __hidden; 50 51static inline void 52_thr_umutex_init(struct umutex *mtx) 53{ 54 struct umutex tmp = DEFAULT_UMUTEX; 55 *mtx = tmp; 56} 57 58static inline int 59_thr_umutex_trylock(struct umutex *mtx, uint32_t id) 60{ 61 if (atomic_cmpset_acq_32(&mtx->m_owner, UMUTEX_UNOWNED, id)) 62 return (0); 63 if ((mtx->m_flags & UMUTEX_PRIO_PROTECT) == 0) 64 return (EBUSY); 65 return (__thr_umutex_kern_trylock(mtx)); 66} 67 68static inline int 69_thr_umutex_lock(struct umutex *mtx, uint32_t id) 70{ 71 if (atomic_cmpset_acq_32(&mtx->m_owner, UMUTEX_UNOWNED, id)) 72 return (0); 73 return (__thr_umutex_lock(mtx, id)); 74} 75 76static inline int 77_thr_umutex_timedlock(struct umutex *mtx, uint32_t id, 78 const struct timespec *timeout) 79{ 80 if (atomic_cmpset_acq_32(&mtx->m_owner, UMUTEX_UNOWNED, id)) 81 return (0); 82 return (__thr_umutex_timedlock(mtx, id, timeout)); 83} 84 85static inline int 86_thr_umutex_unlock(struct umutex *mtx, uint32_t id) 87{ 88 if (atomic_cmpset_rel_32(&mtx->m_owner, id, UMUTEX_UNOWNED)) 89 return (0); 90 return (__thr_umutex_unlock(mtx, id)); 91} 92 93#endif 94