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/**
* @file
*
* @ingroup rtems_bsd_rtems
*
* @brief TODO.
*/
/*
* Copyright (c) 2009-2014 embedded brains GmbH. All rights reserved.
*
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* 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.
*/
#include <machine/rtems-bsd-kernel-space.h>
#include <machine/rtems-bsd-support.h>
#include <rtems/score/threaddispatch.h>
#include <rtems/score/threadimpl.h>
#include <rtems/score/threadqimpl.h>
#include <rtems/bsd/sys/param.h>
#include <rtems/bsd/sys/types.h>
#include <sys/systm.h>
#include <rtems/bsd/sys/lock.h>
#include <sys/condvar.h>
#include <sys/mutex.h>
void
cv_init(struct cv *cv, const char *desc)
{
cv->cv_description = desc;
_Thread_queue_Initialize(&cv->cv_waiters, THREAD_QUEUE_DISCIPLINE_PRIORITY,
STATES_WAITING_FOR_CONDITION_VARIABLE, EWOULDBLOCK);
}
void
cv_destroy(struct cv *cv)
{
BSD_ASSERT(_Thread_queue_First(&cv->cv_waiters) == NULL);
}
static int
_cv_wait_support(struct cv *cv, struct lock_object *lock, Watchdog_Interval timo, bool relock)
{
int error;
struct lock_class *class;
int lock_state;
Thread_Control *executing;
_Thread_Disable_dispatch();
class = LOCK_CLASS(lock);
lock_state = (*class->lc_unlock)(lock);
_Thread_queue_Enter_critical_section(&cv->cv_waiters);
executing = _Thread_Executing;
executing->Wait.return_code = 0;
executing->Wait.queue = &cv->cv_waiters;
_Thread_queue_Enqueue(&cv->cv_waiters, executing, timo);
DROP_GIANT();
_Thread_Enable_dispatch();
PICKUP_GIANT();
error = (int)executing->Wait.return_code;
if (relock) {
(*class->lc_lock)(lock, lock_state);
}
return (error);
}
void
_cv_wait(struct cv *cv, struct lock_object *lock)
{
_cv_wait_support(cv, lock, 0, true);
}
void
_cv_wait_unlock(struct cv *cv, struct lock_object *lock)
{
_cv_wait_support(cv, lock, 0, false);
}
int
_cv_timedwait(struct cv *cv, struct lock_object *lock, int timo)
{
if (timo <= 0)
timo = 1;
return (_cv_wait_support(cv, lock, (Watchdog_Interval)timo, true));
}
void
cv_signal(struct cv *cv)
{
_Thread_Disable_dispatch();
_Thread_queue_Dequeue(&cv->cv_waiters);
_Thread_Enable_dispatch();
}
void
cv_broadcastpri(struct cv *cv, int pri)
{
_Thread_Disable_dispatch();
while (_Thread_queue_Dequeue(&cv->cv_waiters) != NULL) {
/* Again */
}
_Thread_Enable_dispatch();
}
int
_cv_wait_sig(struct cv *cv, struct lock_object *lock)
{
return (_cv_wait_support(cv, lock, 0, true));
}
int
_cv_timedwait_sig(struct cv *cv, struct lock_object *lock, int timo)
{
if (timo <= 0)
timo = 1;
return (_cv_wait_support(cv, lock, (Watchdog_Interval)timo, true));
}
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