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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSScoreSyslockSemaphore
*
* @brief This header file provides the interfaces of the
* @ref RTEMSScoreSyslockSemaphore.
*/
/*
* Copyright (c) 2015, 2017 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_SEMAPHOREIMPL_H
#define _RTEMS_SCORE_SEMAPHOREIMPL_H
#include <sys/lock.h>
#include <rtems/score/percpu.h>
#include <rtems/score/threadqimpl.h>
/**
* @defgroup RTEMSScoreSyslockSemaphore System Lock Semaphore Support
*
* @ingroup RTEMSScore
*
* @brief The System Lock Semaphore Support helps to implement directives which
* use data structures compatible with the data structures defined by the
* Newlib provided <sys/lock.h> header file.
*
* @{
*/
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
typedef struct {
Thread_queue_Syslock_queue Queue;
unsigned int count;
} Sem_Control;
#define SEMAPHORE_TQ_OPERATIONS &_Thread_queue_Operations_priority
/**
* @brief Gets the Sem_Control * of the semaphore.
*
* @param sem The Semaphore_Control * to cast to Sem_Control *.
*
* @return @a sem cast to Sem_Control *.
*/
static inline Sem_Control *_Sem_Get( struct _Semaphore_Control *_sem )
{
return (Sem_Control *) _sem;
}
/**
* @brief Acquires the semaphore queue critical.
*
* This routine acquires the semaphore.
*
* @param[in, out] sem The semaphore to acquire the queue of.
* @param queue_context The thread queue context.
*
* @return The executing thread.
*/
static inline Thread_Control *_Sem_Queue_acquire_critical(
Sem_Control *sem,
Thread_queue_Context *queue_context
)
{
Thread_Control *executing;
executing = _Thread_Executing;
_Thread_queue_Queue_acquire_critical(
&sem->Queue.Queue,
&executing->Potpourri_stats,
&queue_context->Lock_context.Lock_context
);
return executing;
}
/**
* @brief Releases the semaphore queue.
*
* @param[in, out] sem The semaphore to release the queue of.
* @param level The interrupt level value to restore the interrupt status on the processor.
* @param queue_context The thread queue context.
*/
static inline void _Sem_Queue_release(
Sem_Control *sem,
ISR_Level level,
Thread_queue_Context *queue_context
)
{
_Thread_queue_Queue_release_critical(
&sem->Queue.Queue,
&queue_context->Lock_context.Lock_context
);
_ISR_Local_enable( level );
}
#ifdef __cplusplus
}
#endif /* __cplusplus */
/** @} */
#endif /* _RTEMS_SCORE_SEMAPHOREIMPL_H */
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