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 1.5 2008/04/14 20:12:41 dillon 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 1 35 #define UMTX_CONTESTED 2 36 37 typedef int umtx_t; 38 39 int __thr_umtx_lock(volatile umtx_t *mtx, int timo); 40 int __thr_umtx_timedlock(volatile umtx_t *mtx, 41 const struct timespec *timeout); 42 void __thr_umtx_unlock(volatile umtx_t *mtx); 43 44 static inline void 45 _thr_umtx_init(volatile umtx_t *mtx) 46 { 47 *mtx = 0; 48 } 49 50 static inline int 51 _thr_umtx_trylock(volatile umtx_t *mtx, int id __unused) 52 { 53 if (atomic_cmpset_acq_int(mtx, 0, 1)) 54 return (0); 55 return (EBUSY); 56 } 57 58 static inline int 59 _thr_umtx_lock(volatile umtx_t *mtx, int id __unused) 60 { 61 if (atomic_cmpset_acq_int(mtx, 0, 1)) 62 return (0); 63 return (__thr_umtx_lock(mtx, 0)); 64 } 65 66 static inline int 67 _thr_umtx_timedlock(volatile umtx_t *mtx, int id __unused, 68 const struct timespec *timeout) 69 { 70 if (atomic_cmpset_acq_int(mtx, 0, 1)) 71 return (0); 72 return (__thr_umtx_timedlock(mtx, timeout)); 73 } 74 75 static inline void 76 _thr_umtx_unlock(volatile umtx_t *mtx, int id __unused) 77 { 78 if (atomic_cmpset_acq_int(mtx, 1, 0)) 79 return; 80 __thr_umtx_unlock(mtx); 81 } 82 83 int _thr_umtx_wait(volatile umtx_t *mtx, umtx_t exp, 84 const struct timespec *timeout, int clockid); 85 void _thr_umtx_wake(volatile umtx_t *mtx, int count); 86 87 #endif 88