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/**
* @file
*
* @ingroup RTEMSScoreSemaphore
*
* @brief Semaphore Implementation
*/
/*
* Copyright (c) 2015, 2017 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifndef _RTEMS_SCORE_SEMAPHOREIMPL_H
#define _RTEMS_SCORE_SEMAPHOREIMPL_H
#include <sys/lock.h>
#include <rtems/score/percpu.h>
#include <rtems/score/threadqimpl.h>
/**
* @addtogroup RTEMSScoreSemaphore
*
* @{
*/
#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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