| /*- |
| * Copyright (c) 2000 Jake Burkholder <jake@freebsd.org>. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * $FreeBSD$ |
| */ |
| |
| #ifndef _BSD_SYS_CONDVAR_H_ |
| #define _BSD_SYS_CONDVAR_H_ |
| |
| #ifndef LOCORE |
| #include <sys/bsd_queue.h> |
| |
| struct lock_object; |
| struct thread; |
| |
| TAILQ_HEAD(cv_waitq, thread); |
| |
| /* |
| * Condition variable. The waiters count is protected by the mutex that |
| * protects the condition; that is, the mutex that is passed to cv_wait*() |
| * and is held across calls to cv_signal() and cv_broadcast(). It is an |
| * optimization to avoid looking up the sleep queue if there are no waiters. |
| */ |
| struct cv { |
| const char *cv_description; |
| int cv_waiters; |
| }; |
| |
| #ifdef _FREEBSD_KERNEL |
| void cv_init(struct cv *cvp, const char *desc); |
| void cv_destroy(struct cv *cvp); |
| |
| void _cv_wait(struct cv *cvp, struct lock_object *lock); |
| void _cv_wait_unlock(struct cv *cvp, struct lock_object *lock); |
| int _cv_wait_sig(struct cv *cvp, struct lock_object *lock); |
| int _cv_timedwait(struct cv *cvp, struct lock_object *lock, int timo); |
| int _cv_timedwait_sig(struct cv *cvp, struct lock_object *lock, int timo); |
| |
| void cv_signal(struct cv *cvp); |
| void cv_broadcastpri(struct cv *cvp, int pri); |
| |
| #define cv_wait(cvp, lock) \ |
| _cv_wait((cvp), &(lock)->lock_object) |
| #define cv_wait_unlock(cvp, lock) \ |
| _cv_wait_unlock((cvp), &(lock)->lock_object) |
| #define cv_wait_sig(cvp, lock) \ |
| _cv_wait_sig((cvp), &(lock)->lock_object) |
| #define cv_timedwait(cvp, lock, timo) \ |
| _cv_timedwait((cvp), &(lock)->lock_object, (timo)) |
| #define cv_timedwait_sig(cvp, lock, timo) \ |
| _cv_timedwait_sig((cvp), &(lock)->lock_object, (timo)) |
| |
| #define cv_broadcast(cvp) cv_broadcastpri(cvp, 0) |
| |
| #define cv_wmesg(cvp) ((cvp)->cv_description) |
| |
| #endif /* _FREEBSD_KERNEL */ |
| #endif /* !LOCORE */ |
| #endif /* _BSD_SYS_CONDVAR_H_ */ |