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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSScoreMRSP
*
* @brief This header file provides interfaces of the
* @ref RTEMSScoreMRSP which are used by the implementation and the
* @ref RTEMSImplApplConfig.
*/
/*
* Copyright (c) 2014, 2016 embedded brains GmbH. 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
*/
#ifndef _RTEMS_SCORE_MRSP_H
#define _RTEMS_SCORE_MRSP_H
#include <rtems/score/cpuopts.h>
#include <rtems/score/threadq.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/**
* @defgroup RTEMSScoreMRSP Multiprocessor Resource Sharing Protocol (MrsP)
*
* @ingroup RTEMSScore
*
* @brief This group contains the implementation to support the Multiprocessor
* Resource Sharing Protocol (MrsP) .
*
* The Multiprocessor Resource Sharing Protocol (MrsP) is defined in A. Burns
* and A.J. Wellings, A Schedulability Compatible Multiprocessor Resource
* Sharing Protocol - MrsP, Proceedings of the 25th Euromicro Conference on
* Real-Time Systems (ECRTS 2013), July 2013. It is a generalization of the
* Priority Ceiling Protocol to SMP systems. Each MrsP semaphore uses a
* ceiling priority per scheduler instance. A task obtaining or owning a MrsP
* semaphore will execute with the ceiling priority for its scheduler instance
* as specified by the MrsP semaphore object. Tasks waiting to get ownership
* of a MrsP semaphore will not relinquish the processor voluntarily. In case
* the owner of a MrsP semaphore gets preempted it can ask all tasks waiting
* for this semaphore to help out and temporarily borrow the right to execute
* on one of their assigned processors.
*
* @{
*/
#if defined(RTEMS_SMP)
/**
* @brief MrsP control block.
*/
typedef struct {
/**
* @brief The thread queue to manage ownership and waiting threads.
*/
Thread_queue_Control Wait_queue;
/**
* @brief The ceiling priority used by the owner thread.
*/
Priority_Node Ceiling_priority;
/**
* @brief One ceiling priority per scheduler instance.
*/
Priority_Control ceiling_priorities[ RTEMS_ZERO_LENGTH_ARRAY ];
} MRSP_Control;
#endif /* RTEMS_SMP */
/** @} */
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* _RTEMS_SCORE_MRSP_H */
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