1 /*- 2 * Copyright (c) 2003 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 * $DragonFly: src/lib/libthread_xu/thread/thr_umtx.h,v 1.2 2005/03/15 11:24:23 davidxu Exp $ 27 */ 28 29 #ifndef _THR_DFLY_UMTX_H_ 30 #define _THR_DFLY_UMTX_H_ 31 32 #include <unistd.h> 33 34 #define UMTX_LOCKED 0x80000000 35 36 typedef int umtx_t; 37 38 int __thr_umtx_lock(volatile umtx_t *mtx, int timo); 39 int __thr_umtx_timedlock(volatile umtx_t *mtx, 40 const struct timespec *timeout); 41 void __thr_umtx_unlock(volatile umtx_t *mtx); 42 43 static inline void 44 _thr_umtx_init(volatile umtx_t *mtx) 45 { 46 *mtx = 0; 47 } 48 49 static inline int 50 _thr_umtx_trylock(volatile umtx_t *mtx, long id) 51 { 52 if (atomic_cmpset_acq_int(mtx, 0, UMTX_LOCKED)) 53 return (0); 54 return (EBUSY); 55 } 56 57 static inline int 58 _thr_umtx_lock(volatile umtx_t *mtx, long id) 59 { 60 if (atomic_cmpset_acq_int(mtx, 0, UMTX_LOCKED)) 61 return (0); 62 return (__thr_umtx_lock(mtx, 0)); 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_int(mtx, 0, UMTX_LOCKED)) 70 return (0); 71 return (__thr_umtx_timedlock(mtx, timeout)); 72 } 73 74 static inline void 75 _thr_umtx_unlock(volatile umtx_t *mtx, long id) 76 { 77 if (atomic_cmpset_acq_int(mtx, UMTX_LOCKED, 0)) 78 return; 79 __thr_umtx_unlock(mtx); 80 } 81 82 int _thr_umtx_wait(volatile umtx_t *mtx, umtx_t exp, 83 const struct timespec *timeout, int clockid); 84 void _thr_umtx_wake(volatile umtx_t *mtx, int count); 85 86 #endif 87