thr_umtx.c revision 165115
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 unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * $FreeBSD: head/lib/libthr/thread/thr_umtx.c 165115 2006-12-12 05:26:39Z davidxu $ 27 * 28 */ 29 30#include "thr_private.h" 31#include "thr_umtx.h" 32 33void 34_thr_umutex_init(struct umutex *mtx) 35{ 36 static struct umutex default_mtx = DEFAULT_UMUTEX; 37 38 *mtx = default_mtx; 39} 40 41int 42__thr_umutex_lock(struct umutex *mtx) 43{ 44 if (_umtx_op(mtx, UMTX_OP_MUTEX_LOCK, 0, 0, 0) != -1) 45 return 0; 46 return (errno); 47} 48 49int 50__thr_umutex_timedlock(struct umutex *mtx, 51 const struct timespec *timeout) 52{ 53 if (timeout && (timeout->tv_sec < 0 || (timeout->tv_sec == 0 && 54 timeout->tv_nsec <= 0))) 55 return (ETIMEDOUT); 56 if (_umtx_op(mtx, UMTX_OP_MUTEX_LOCK, 0, 0, 57 __DECONST(void *, timeout)) != -1) 58 return (0); 59 return (errno); 60} 61 62int 63__thr_umutex_unlock(struct umutex *mtx) 64{ 65 if (_umtx_op(mtx, UMTX_OP_MUTEX_UNLOCK, 0, 0, 0) != -1) 66 return (0); 67 return (errno); 68} 69 70int 71__thr_umutex_trylock(struct umutex *mtx) 72{ 73 if (_umtx_op(mtx, UMTX_OP_MUTEX_TRYLOCK, 0, 0, 0) != -1) 74 return (0); 75 return (errno); 76} 77 78int 79__thr_umutex_set_ceiling(struct umutex *mtx, uint32_t ceiling, 80 uint32_t *oldceiling) 81{ 82 if (_umtx_op(mtx, UMTX_OP_SET_CEILING, ceiling, oldceiling, 0) != -1) 83 return (0); 84 return (errno); 85} 86 87int 88_thr_umtx_wait(volatile umtx_t *mtx, long id, const struct timespec *timeout) 89{ 90 if (timeout && (timeout->tv_sec < 0 || (timeout->tv_sec == 0 && 91 timeout->tv_nsec <= 0))) 92 return (ETIMEDOUT); 93 if (_umtx_op(__DEVOLATILE(void *, mtx), UMTX_OP_WAIT, id, 0, 94 __DECONST(void*, timeout)) != -1) 95 return (0); 96 return (errno); 97} 98 99int 100_thr_umtx_wake(volatile umtx_t *mtx, int nr_wakeup) 101{ 102 if (_umtx_op(__DEVOLATILE(void *, mtx), UMTX_OP_WAKE, 103 nr_wakeup, 0, 0) != -1) 104 return (0); 105 return (errno); 106} 107 108void 109_thr_ucond_init(struct ucond *cv) 110{ 111 bzero(cv, sizeof(struct ucond)); 112} 113 114int 115_thr_ucond_wait(struct ucond *cv, struct umutex *m, 116 const struct timespec *timeout, int check_unparking) 117{ 118 if (timeout && (timeout->tv_sec < 0 || (timeout->tv_sec == 0 && 119 timeout->tv_nsec <= 0))) { 120 __thr_umutex_unlock(m); 121 return (ETIMEDOUT); 122 } 123 if (_umtx_op(cv, UMTX_OP_CV_WAIT, 124 check_unparking ? UMTX_CHECK_UNPARKING : 0, 125 m, __DECONST(void*, timeout)) != -1) { 126 return (0); 127 } 128 return (errno); 129} 130 131int 132_thr_ucond_signal(struct ucond *cv) 133{ 134 if (!cv->c_has_waiters) 135 return (0); 136 if (_umtx_op(cv, UMTX_OP_CV_SIGNAL, 0, NULL, NULL) != -1) 137 return (0); 138 return (errno); 139} 140 141int 142_thr_ucond_broadcast(struct ucond *cv) 143{ 144 if (!cv->c_has_waiters) 145 return (0); 146 if (_umtx_op(cv, UMTX_OP_CV_BROADCAST, 0, NULL, NULL) != -1) 147 return (0); 148 return (errno); 149} 150