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https://git.rtems.org/rtems-libbsd/
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97 lines
3.1 KiB
C
97 lines
3.1 KiB
C
/**
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* @file
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*
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* @ingroup rtems_bsd_rtems
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*
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* @brief TODO.
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*/
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/*
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* Copyright (c) 2014, 2015 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Dornierstr. 4
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* 82178 Puchheim
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* Germany
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* <rtems@embedded-brains.de>
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <machine/rtems-bsd-kernel-space.h>
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#include <machine/rtems-bsd-muteximpl.h>
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#include <rtems/score/schedulerimpl.h>
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#include <rtems/score/threadqimpl.h>
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#define BSD_MUTEX_TQ_OPERATIONS &_Thread_queue_Operations_priority
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void
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rtems_bsd_mutex_lock_more(struct lock_object *lock, rtems_bsd_mutex *m,
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Thread_Control *owner, Thread_Control *executing,
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Thread_queue_Context *queue_context)
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{
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if (owner == executing) {
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BSD_ASSERT(lock->lo_flags & LO_RECURSABLE);
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++m->nest_level;
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_Thread_queue_Release(&m->queue, &queue_context->Lock_context);
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} else {
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/* Priority inheritance */
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_Thread_Raise_priority(owner, executing->current_priority);
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++executing->resource_count;
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_Thread_queue_Context_set_expected_level(queue_context, 1);
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_Thread_queue_Enqueue_critical(&m->queue,
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BSD_MUTEX_TQ_OPERATIONS, executing,
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STATES_WAITING_FOR_MUTEX, WATCHDOG_NO_TIMEOUT,
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queue_context);
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}
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}
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void
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rtems_bsd_mutex_unlock_more(rtems_bsd_mutex *m, Thread_Control *owner,
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int keep_priority, Thread_queue_Heads *heads,
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Thread_queue_Context *queue_context)
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{
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if (heads != NULL) {
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const Thread_queue_Operations *operations;
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Thread_Control *new_owner;
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operations = BSD_MUTEX_TQ_OPERATIONS;
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new_owner = ( *operations->first )( heads );
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m->owner = new_owner;
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_Thread_queue_Extract_critical(&m->queue, operations,
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new_owner, queue_context);
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} else {
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_Thread_queue_Release(&m->queue, &queue_context->Lock_context);
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}
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if (!keep_priority) {
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Per_CPU_Control *cpu_self;
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cpu_self = _Thread_Dispatch_disable();
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_Thread_Restore_priority(owner);
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_Thread_Dispatch_enable(cpu_self);
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}
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}
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