FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/os/freebsd/spl/sys/spl_condvar.h

     /*
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * 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 _SPL_SYS_CONDVAR_H_
    #define _SPL_SYS_CONDVAR_H_
    
    #ifndef LOCORE
    #include <sys/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;
    };
    
    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_sbt(struct cv *cvp, struct lock_object *lock,
                sbintime_t sbt, sbintime_t pr, int flags);
    int     _cv_timedwait_sig_sbt(struct cv *cvp, struct lock_object *lock,
                sbintime_t sbt, sbintime_t pr, int flags);
    
    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_timedwait_sbt(cvp, lock, sbt, pr, flags)                     \
            _cv_timedwait_sbt((cvp), &(lock)->lock_object, (sbt), (pr), (flags))
    #define cv_timedwait_sig_sbt(cvp, lock, sbt, pr, flags)                 \
            _cv_timedwait_sig_sbt((cvp), &(lock)->lock_object, (sbt), (pr), (flags))
    
    #define cv_broadcast(cvp)       cv_broadcastpri(cvp, 0)
    
    #define cv_wmesg(cvp)           ((cvp)->cv_description)
    
    #endif  /* !LOCORE */
    #endif  /* _SYS_CONDVAR_H_ */

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