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 */ 27 28 #ifndef _THR_DFLY_UMTX_H_ 29 #define _THR_DFLY_UMTX_H_ 30 31 #include <unistd.h> 32 33 #define UMTX_LOCKED 1 34 #define UMTX_CONTESTED 2 35 36 typedef int umtx_t; 37 38 int __thr_umtx_lock(volatile umtx_t *mtx, int id, int timo); 39 int __thr_umtx_timedlock(volatile umtx_t *mtx, int id, 40 const struct timespec *timeout); 41 void __thr_umtx_unlock(volatile umtx_t *mtx, int id); 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, int id) 51 { 52 if (atomic_cmpset_acq_int(mtx, 0, id)) { 53 return (0); 54 } 55 return (EBUSY); 56 } 57 58 static inline int 59 _thr_umtx_lock(volatile umtx_t *mtx, int id) 60 { 61 if (atomic_cmpset_acq_int(mtx, 0, id)) { 62 return (0); 63 } 64 return (__thr_umtx_lock(mtx, id, 0)); 65 } 66 67 static inline int 68 _thr_umtx_timedlock(volatile umtx_t *mtx, int id, 69 const struct timespec *timeout) 70 { 71 if (atomic_cmpset_acq_int(mtx, 0, id)) { 72 return (0); 73 } 74 return (__thr_umtx_timedlock(mtx, id, timeout)); 75 } 76 77 static inline void 78 _thr_umtx_unlock(volatile umtx_t *mtx, int id) 79 { 80 if (atomic_cmpset_acq_int(mtx, id, 0)) { 81 return; 82 } 83 __thr_umtx_unlock(mtx, id); 84 } 85 86 int _thr_umtx_wait(volatile umtx_t *mtx, umtx_t exp, 87 const struct timespec *timeout, int clockid); 88 int _thr_umtx_wait_intr(volatile umtx_t *mtx, umtx_t exp); 89 void _thr_umtx_wake(volatile umtx_t *mtx, int count); 90 #endif 91