/**
* @file
*
* @ingroup rtems_bsd_rtems
*
* @brief TODO.
*/
/*
* Copyright (c) 2014, 2015 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* 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-muteximpl.h>
#include <rtems/score/schedulerimpl.h>
#include <rtems/score/threadqimpl.h>
#define BSD_MUTEX_TQ_OPERATIONS &_Thread_queue_Operations_priority
void
rtems_bsd_mutex_lock_more(struct lock_object *lock, rtems_bsd_mutex *m,
Thread_Control *owner, Thread_Control *executing,
Thread_queue_Context *queue_context)
{
if (owner == executing) {
BSD_ASSERT(lock->lo_flags & LO_RECURSABLE);
++m->nest_level;
_Thread_queue_Release(&m->queue, &queue_context->Lock_context);
} else {
/* Priority inheritance */
_Thread_Raise_priority(owner, executing->current_priority);
++executing->resource_count;
_Thread_queue_Context_set_expected_level(queue_context, 1);
_Thread_queue_Enqueue_critical(&m->queue,
BSD_MUTEX_TQ_OPERATIONS, executing,
STATES_WAITING_FOR_MUTEX, WATCHDOG_NO_TIMEOUT,
queue_context);
}
}
void
rtems_bsd_mutex_unlock_more(rtems_bsd_mutex *m, Thread_Control *owner,
int keep_priority, Thread_queue_Heads *heads,
Thread_queue_Context *queue_context)
{
if (heads != NULL) {
const Thread_queue_Operations *operations;
Thread_Control *new_owner;
operations = BSD_MUTEX_TQ_OPERATIONS;
new_owner = ( *operations->first )( heads );
m->owner = new_owner;
_Thread_queue_Extract_critical(&m->queue, operations,
new_owner, queue_context);
} else {
_Thread_queue_Release(&m->queue, &queue_context->Lock_context);
}
if (!keep_priority) {
Per_CPU_Control *cpu_self;
cpu_self = _Thread_Dispatch_disable();
_Thread_Restore_priority(owner);
_Thread_Dispatch_enable(cpu_self);
}
}
