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/**
* @file
*
* @ingroup RTEMSScoreBarrier
*
* @brief This header file provides interfaces of the
* @ref RTEMSScoreBarrier which are only used by the implementation.
*/
/*
* COPYRIGHT (c) 1989-2006.
* On-Line Applications Research Corporation (OAR).
*
* 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_COREBARRIERIMPL_H
#define _RTEMS_SCORE_COREBARRIERIMPL_H
#include <rtems/score/corebarrier.h>
#include <rtems/score/status.h>
#include <rtems/score/threadqimpl.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @addtogroup RTEMSScoreBarrier
*
* @{
*/
/**
* @brief This maximum thread count constant indicates that the barrier is a
* manual release barrier.
*/
#define CORE_BARRIER_MANUAL_RELEASE_MAXIMUM_COUNT 0
/**
* @brief These thread queue operations are used for core barriers.
*
* They are a specialization of ::_Thread_queue_Operations_FIFO. The only
* difference is that the extract operation decrements
* CORE_barrier_Control::number_of_waiting_threads.
*/
extern const Thread_queue_Operations _CORE_barrier_Thread_queue_operations;
/**
* @brief Initializes the core barrier.
*
* @param[out] the_barrier is the barrier to initialize.
*
* @param maximum_count is the number of threads which must arrive at the
* barrier to trip the automatic release or
* ::CORE_BARRIER_MANUAL_RELEASE_MAXIMUM_COUNT to indicate a manual release
* barrier.
*/
void _CORE_barrier_Initialize(
CORE_barrier_Control *the_barrier,
uint32_t maximum_count
);
/**
* @brief Destroys the core barrier.
*
* This routine destroys the barrier.
*
* @param[out] the_barrier The barrier to destroy.
*/
RTEMS_INLINE_ROUTINE void _CORE_barrier_Destroy(
CORE_barrier_Control *the_barrier
)
{
_Thread_queue_Destroy( &the_barrier->Wait_queue );
}
/**
* @brief Acquires critical core barrier.
*
* @param[in, out] the_barrier The barrier to acquire.
* @param queue_context The thread queue context.
*/
RTEMS_INLINE_ROUTINE void _CORE_barrier_Acquire_critical(
CORE_barrier_Control *the_barrier,
Thread_queue_Context *queue_context
)
{
_Thread_queue_Acquire_critical( &the_barrier->Wait_queue, queue_context );
}
/**
* @brief Releases core barrier.
*
* @param[in, out] the_barrier The barrier to release.
* @param queue_context The thread queue context.
*/
RTEMS_INLINE_ROUTINE void _CORE_barrier_Release(
CORE_barrier_Control *the_barrier,
Thread_queue_Context *queue_context
)
{
_Thread_queue_Release( &the_barrier->Wait_queue, queue_context );
}
/**
* @brief Waits for the barrier.
*
* This routine waits for the barrier to be released. If the barrier
* is set to automatic and this is the appropriate thread, then it returns
* immediately. Otherwise, the calling thread is blocked until the barrier
* is released.
*
* @param[in, out] the_barrier The barrier to wait for.
* @param[in, out] executing The currently executing thread.
* @param wait This parameter is true if the calling thread is willing to wait.
* @param queue_context The thread queue context.
*
* @return The method status.
*/
Status_Control _CORE_barrier_Seize(
CORE_barrier_Control *the_barrier,
Thread_Control *executing,
bool wait,
Thread_queue_Context *queue_context
);
/**
* @brief Manually releases the barrier.
*
* This routine manually releases the barrier. All of the threads waiting
* for the barrier will be readied.
*
* @param[in, out] the_barrier The barrier to surrender.
* @param[out] queue_context The thread queue context.
*
* @return The number of unblocked threads.
*/
RTEMS_INLINE_ROUTINE uint32_t _CORE_barrier_Surrender(
CORE_barrier_Control *the_barrier,
Thread_queue_Context *queue_context
)
{
return _Thread_queue_Flush_critical(
&the_barrier->Wait_queue.Queue,
&_CORE_barrier_Thread_queue_operations,
_Thread_queue_Flush_default_filter,
queue_context
);
}
/**
* @brief Flushes the barrier using _CORE_barrier_Do_flush().
*
* @param[in, out] the_barrier The barrier to flush.
* @param queue_context The thread queue context.
*/
RTEMS_INLINE_ROUTINE void _CORE_barrier_Flush(
CORE_barrier_Control *the_barrier,
Thread_queue_Context *queue_context
)
{
_Thread_queue_Flush_critical(
&the_barrier->Wait_queue.Queue,
&_CORE_barrier_Thread_queue_operations,
_Thread_queue_Flush_status_object_was_deleted,
queue_context
);
}
/** @} */
#ifdef __cplusplus
}
#endif
#endif
/* end of include file */
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