89 lines
3.6 KiB
C
89 lines
3.6 KiB
C
/*
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* Copyright (c) 2000 Jake Burkholder <jake@freebsd.org>.All rights reserved.
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* Copyright (c) 2010 Kip Macy All rights reserved.
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* Copyright (c) 2013 Patrick Kelsey. All rights reserved.
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* Copyright (C) 2017 THL A29 Limited, a Tencent company.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef _FSTACK_SYS_CONDVAR_H_
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#define _FSTACK_SYS_CONDVAR_H_
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#ifndef LOCORE
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#include <sys/queue.h>
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#include "ff_host_interface.h"
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struct lock_object;
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struct thread;
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TAILQ_HEAD(cv_waitq, thread);
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/*
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* Condition variable. The waiters count is protected by the mutex that
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* protects the condition; that is, the mutex that is passed to cv_wait*()
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* and is held across calls to cv_signal() and cv_broadcast(). It is an
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* optimization to avoid looking up the sleep queue if there are no waiters.
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*/
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struct cv {
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const char *cv_description;
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ff_cond_t cv_cond;
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};
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#ifdef _KERNEL
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void cv_init(struct cv *cvp, const char *desc);
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void cv_destroy(struct cv *cvp);
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void _cv_wait(struct cv *cvp, struct lock_object *lock);
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void _cv_wait_unlock(struct cv *cvp, struct lock_object *lock);
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int _cv_wait_sig(struct cv *cvp, struct lock_object *lock);
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int _cv_timedwait(struct cv *cvp, struct lock_object *lock, int timo);
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int _cv_timedwait_sig(struct cv *cvp, struct lock_object *lock, int timo);
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int _cv_timedwait_sig_sbt(struct cv *cvp, struct lock_object *lock,
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sbintime_t sbt, sbintime_t pr, int flags);
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void cv_signal(struct cv *cvp);
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void cv_broadcastpri(struct cv *cvp, int pri);
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#define cv_wait(cvp, lock) \
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_cv_wait((cvp), &(lock)->lock_object)
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#define cv_wait_unlock(cvp, lock) \
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_cv_wait_unlock((cvp), &(lock)->lock_object)
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#define cv_wait_sig(cvp, lock) \
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_cv_wait_sig((cvp), &(lock)->lock_object)
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#define cv_timedwait(cvp, lock, timo) \
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_cv_timedwait((cvp), &(lock)->lock_object, (timo))
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#define cv_timedwait_sig(cvp, lock, timo) \
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_cv_timedwait_sig((cvp), &(lock)->lock_object, (timo))
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#define cv_timedwait_sig_sbt(cvp, lock, sbt, pr, flags) \
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_cv_timedwait_sig_sbt((cvp), &(lock)->lock_object, (sbt), (pr), (flags))
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#define cv_broadcast(cvp) cv_broadcastpri(cvp, 0)
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#define cv_wmesg(cvp) ((cvp)->cv_description)
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#endif /* _KERNEL */
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#endif /* !LOCORE */
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#endif /* _FSTACK_SYS_CONDVAR_H_ */
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