1/* 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2000 Jake Burkholder <jake@freebsd.org>. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31#ifndef _SPL_SYS_CONDVAR_H_ 32#define _SPL_SYS_CONDVAR_H_ 33 34#ifndef LOCORE 35#include <sys/queue.h> 36 37struct lock_object; 38struct thread; 39 40TAILQ_HEAD(cv_waitq, thread); 41 42/* 43 * Condition variable. The waiters count is protected by the mutex that 44 * protects the condition; that is, the mutex that is passed to cv_wait*() 45 * and is held across calls to cv_signal() and cv_broadcast(). It is an 46 * optimization to avoid looking up the sleep queue if there are no waiters. 47 */ 48struct cv { 49 const char *cv_description; 50 int cv_waiters; 51}; 52 53void cv_init(struct cv *cvp, const char *desc); 54void cv_destroy(struct cv *cvp); 55 56void _cv_wait(struct cv *cvp, struct lock_object *lock); 57void _cv_wait_unlock(struct cv *cvp, struct lock_object *lock); 58int _cv_wait_sig(struct cv *cvp, struct lock_object *lock); 59int _cv_timedwait_sbt(struct cv *cvp, struct lock_object *lock, 60 sbintime_t sbt, sbintime_t pr, int flags); 61int _cv_timedwait_sig_sbt(struct cv *cvp, struct lock_object *lock, 62 sbintime_t sbt, sbintime_t pr, int flags); 63 64void cv_signal(struct cv *cvp); 65void cv_broadcastpri(struct cv *cvp, int pri); 66 67#define cv_wait(cvp, lock) \ 68 _cv_wait((cvp), &(lock)->lock_object) 69#define cv_wait_unlock(cvp, lock) \ 70 _cv_wait_unlock((cvp), &(lock)->lock_object) 71#define cv_timedwait_sbt(cvp, lock, sbt, pr, flags) \ 72 _cv_timedwait_sbt((cvp), &(lock)->lock_object, (sbt), (pr), (flags)) 73#define cv_timedwait_sig_sbt(cvp, lock, sbt, pr, flags) \ 74 _cv_timedwait_sig_sbt((cvp), &(lock)->lock_object, (sbt), (pr), (flags)) 75 76#define cv_broadcast(cvp) cv_broadcastpri(cvp, 0) 77 78#define cv_wmesg(cvp) ((cvp)->cv_description) 79 80#endif /* !LOCORE */ 81#endif /* _SYS_CONDVAR_H_ */ 82