thr_umtx.c revision 179970
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 179970 2008-06-24 07:32:12Z davidxu $ 27 * 28 */ 29 30#include "thr_private.h" 31#include "thr_umtx.h" 32 33#ifndef HAS__UMTX_OP_ERR 34int _umtx_op_err(void *obj, int op, u_long val, void *uaddr, void *uaddr2) 35{ 36 if (_umtx_op(obj, op, val, uaddr, uaddr2) == -1) 37 return (errno); 38 return (0); 39} 40#endif 41 42void 43_thr_umutex_init(struct umutex *mtx) 44{ 45 static struct umutex default_mtx = DEFAULT_UMUTEX; 46 47 *mtx = default_mtx; 48} 49 50int 51__thr_umutex_lock(struct umutex *mtx, uint32_t id) 52{ 53 uint32_t owner; 54 55 if ((mtx->m_flags & (UMUTEX_PRIO_PROTECT | UMUTEX_PRIO_INHERIT)) == 0) { 56 for (;;) { 57 /* wait in kernel */ 58 _umtx_op_err(mtx, UMTX_OP_MUTEX_WAIT, 0, 0, 0); 59 60 owner = mtx->m_owner; 61 if ((owner & ~UMUTEX_CONTESTED) == 0 && 62 atomic_cmpset_acq_32(&mtx->m_owner, owner, id|owner)) 63 return (0); 64 } 65 } 66 67 return _umtx_op_err(mtx, UMTX_OP_MUTEX_LOCK, 0, 0, 0); 68} 69 70int 71__thr_umutex_timedlock(struct umutex *mtx, uint32_t id, 72 const struct timespec *ets) 73{ 74 struct timespec timo, cts; 75 uint32_t owner; 76 int ret; 77 78 clock_gettime(CLOCK_REALTIME, &cts); 79 TIMESPEC_SUB(&timo, ets, &cts); 80 81 if (timo.tv_sec < 0) 82 return (ETIMEDOUT); 83 84 for (;;) { 85 if ((mtx->m_flags & (UMUTEX_PRIO_PROTECT | UMUTEX_PRIO_INHERIT)) == 0) { 86 87 /* wait in kernel */ 88 ret = _umtx_op_err(mtx, UMTX_OP_MUTEX_WAIT, 0, 0, &timo); 89 90 /* now try to lock it */ 91 owner = mtx->m_owner; 92 if ((owner & ~UMUTEX_CONTESTED) == 0 && 93 atomic_cmpset_acq_32(&mtx->m_owner, owner, id|owner)) 94 return (0); 95 } else { 96 ret = _umtx_op_err(mtx, UMTX_OP_MUTEX_LOCK, 0, 0, &timo); 97 if (ret == 0) 98 break; 99 } 100 if (ret == ETIMEDOUT) 101 break; 102 clock_gettime(CLOCK_REALTIME, &cts); 103 TIMESPEC_SUB(&timo, ets, &cts); 104 if (timo.tv_sec < 0 || (timo.tv_sec == 0 && timo.tv_nsec == 0)) { 105 ret = ETIMEDOUT; 106 break; 107 } 108 } 109 return (ret); 110} 111 112int 113__thr_umutex_unlock(struct umutex *mtx, uint32_t id) 114{ 115 if ((mtx->m_flags & (UMUTEX_PRIO_PROTECT | UMUTEX_PRIO_INHERIT)) == 0) { 116 atomic_cmpset_rel_32(&mtx->m_owner, id | UMUTEX_CONTESTED, UMUTEX_CONTESTED); 117 return _umtx_op_err(mtx, UMTX_OP_MUTEX_WAKE, 0, 0, 0); 118 } 119 return _umtx_op_err(mtx, UMTX_OP_MUTEX_UNLOCK, 0, 0, 0); 120} 121 122int 123__thr_umutex_trylock(struct umutex *mtx) 124{ 125 return _umtx_op_err(mtx, UMTX_OP_MUTEX_TRYLOCK, 0, 0, 0); 126} 127 128int 129__thr_umutex_set_ceiling(struct umutex *mtx, uint32_t ceiling, 130 uint32_t *oldceiling) 131{ 132 return _umtx_op_err(mtx, UMTX_OP_SET_CEILING, ceiling, oldceiling, 0); 133} 134 135int 136_thr_umtx_wait(volatile long *mtx, long id, const struct timespec *timeout) 137{ 138 if (timeout && (timeout->tv_sec < 0 || (timeout->tv_sec == 0 && 139 timeout->tv_nsec <= 0))) 140 return (ETIMEDOUT); 141 return _umtx_op_err(__DEVOLATILE(void *, mtx), UMTX_OP_WAIT, id, 0, 142 __DECONST(void*, timeout)); 143} 144 145int 146_thr_umtx_wait_uint(volatile u_int *mtx, u_int id, const struct timespec *timeout, int shared) 147{ 148 if (timeout && (timeout->tv_sec < 0 || (timeout->tv_sec == 0 && 149 timeout->tv_nsec <= 0))) 150 return (ETIMEDOUT); 151 return _umtx_op_err(__DEVOLATILE(void *, mtx), 152 shared ? UMTX_OP_WAIT_UINT : UMTX_OP_WAIT_UINT_PRIVATE, id, 0, 153 __DECONST(void*, timeout)); 154} 155 156int 157_thr_umtx_wake(volatile void *mtx, int nr_wakeup, int shared) 158{ 159 return _umtx_op_err(__DEVOLATILE(void *, mtx), shared ? UMTX_OP_WAKE : UMTX_OP_WAKE_PRIVATE, 160 nr_wakeup, 0, 0); 161} 162 163void 164_thr_ucond_init(struct ucond *cv) 165{ 166 bzero(cv, sizeof(struct ucond)); 167} 168 169int 170_thr_ucond_wait(struct ucond *cv, struct umutex *m, 171 const struct timespec *timeout, int check_unparking) 172{ 173 if (timeout && (timeout->tv_sec < 0 || (timeout->tv_sec == 0 && 174 timeout->tv_nsec <= 0))) { 175 struct pthread *curthread = _get_curthread(); 176 _thr_umutex_unlock(m, TID(curthread)); 177 return (ETIMEDOUT); 178 } 179 return _umtx_op_err(cv, UMTX_OP_CV_WAIT, 180 check_unparking ? UMTX_CHECK_UNPARKING : 0, 181 m, __DECONST(void*, timeout)); 182} 183 184int 185_thr_ucond_signal(struct ucond *cv) 186{ 187 if (!cv->c_has_waiters) 188 return (0); 189 return _umtx_op_err(cv, UMTX_OP_CV_SIGNAL, 0, NULL, NULL); 190} 191 192int 193_thr_ucond_broadcast(struct ucond *cv) 194{ 195 if (!cv->c_has_waiters) 196 return (0); 197 return _umtx_op_err(cv, UMTX_OP_CV_BROADCAST, 0, NULL, NULL); 198} 199 200int 201__thr_rwlock_rdlock(struct urwlock *rwlock, int flags, struct timespec *tsp) 202{ 203 return _umtx_op_err(rwlock, UMTX_OP_RW_RDLOCK, flags, NULL, tsp); 204} 205 206int 207__thr_rwlock_wrlock(struct urwlock *rwlock, struct timespec *tsp) 208{ 209 return _umtx_op_err(rwlock, UMTX_OP_RW_WRLOCK, 0, NULL, tsp); 210} 211 212int 213__thr_rwlock_unlock(struct urwlock *rwlock) 214{ 215 return _umtx_op_err(rwlock, UMTX_OP_RW_UNLOCK, 0, NULL, NULL); 216} 217