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/**
* @file
*
* @brief Inlined Routines Associated with the SuperCore RWLock
*
* This include file contains all of the inlined routines associated
* with the SuperCore RWLock.
*/
/*
* COPYRIGHT (c) 1989-2008.
* 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_CORERWLOCKIMPL_H
#define _RTEMS_SCORE_CORERWLOCKIMPL_H
#include <rtems/score/corerwlock.h>
#include <rtems/score/thread.h>
#include <rtems/score/threadqimpl.h>
#include <rtems/score/watchdog.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @addtogroup ScoreRWLock
*/
/**@{**/
#define CORE_RWLOCK_TQ_OPERATIONS &_Thread_queue_Operations_FIFO
/**
* Core RWLock handler return statuses.
*/
typedef enum {
/** This status indicates that the operation completed successfully. */
CORE_RWLOCK_SUCCESSFUL,
/** This status indicates that the thread was blocked waiting for an */
CORE_RWLOCK_WAS_DELETED,
/** This status indicates that the rwlock was not immediately available. */
CORE_RWLOCK_UNAVAILABLE,
/** This status indicates that the calling task was willing to block
* but the operation was unable to complete within the time allotted
* because the resource never became available.
*/
CORE_RWLOCK_TIMEOUT
} CORE_RWLock_Status;
/** This is the last status value.
*/
#define CORE_RWLOCK_STATUS_LAST CORE_RWLOCK_TIMEOUT
/**
* This is used to denote that a thread is blocking waiting for
* read-only access to the RWLock.
*/
#define CORE_RWLOCK_THREAD_WAITING_FOR_READ 0
/**
* This is used to denote that a thread is blocking waiting for
* write-exclusive access to the RWLock.
*/
#define CORE_RWLOCK_THREAD_WAITING_FOR_WRITE 1
/**
* @brief Initialize a RWlock.
*
* This routine initializes the RWLock based on the parameters passed.
*
* @param[in] the_rwlock is the RWLock to initialize
*/
void _CORE_RWLock_Initialize(
CORE_RWLock_Control *the_rwlock
);
RTEMS_INLINE_ROUTINE void _CORE_RWLock_Destroy(
CORE_RWLock_Control *the_rwlock
)
{
_Thread_queue_Destroy( &the_rwlock->Wait_queue );
}
RTEMS_INLINE_ROUTINE void _CORE_RWLock_Acquire_critical(
CORE_RWLock_Control *the_rwlock,
Thread_queue_Context *queue_context
)
{
_Thread_queue_Acquire_critical(
&the_rwlock->Wait_queue,
&queue_context->Lock_context
);
}
RTEMS_INLINE_ROUTINE void _CORE_RWLock_Release(
CORE_RWLock_Control *the_rwlock,
Thread_queue_Context *queue_context
)
{
_Thread_queue_Release(
&the_rwlock->Wait_queue,
&queue_context->Lock_context
);
}
/**
* @brief Obtain RWLock for reading.
*
* This routine attempts to obtain the RWLock for read access.
*
* @param[in] the_rwlock is the RWLock to wait for
* @param[in] wait is true if the calling thread is willing to wait
* @param[in] timeout is the number of ticks the calling thread is willing
* to wait if @a wait is true.
*
* @note Status is returned via the thread control block.
*/
void _CORE_RWLock_Seize_for_reading(
CORE_RWLock_Control *the_rwlock,
Thread_Control *executing,
bool wait,
Watchdog_Interval timeout,
Thread_queue_Context *queue_context
);
/**
* @brief Obtain RWLock for writing.
*
* This routine attempts to obtain the RWLock for write exclusive access.
*
* @param[in] the_rwlock is the RWLock to wait for
* @param[in] wait is true if the calling thread is willing to wait
* @param[in] timeout is the number of ticks the calling thread is willing
* to wait if @a wait is true.
*
* @note Status is returned via the thread control block.
*/
void _CORE_RWLock_Seize_for_writing(
CORE_RWLock_Control *the_rwlock,
Thread_Control *executing,
bool wait,
Watchdog_Interval timeout,
Thread_queue_Context *queue_context
);
/**
* @brief Release the RWLock.
*
* This routine manually releases @a the_rwlock. All of the threads waiting
* for the RWLock will be readied.
*
* @param[in] the_rwlock is the RWLock to surrender
*
* @retval Status is returned to indicate successful or failure.
*/
CORE_RWLock_Status _CORE_RWLock_Surrender(
CORE_RWLock_Control *the_rwlock,
Thread_queue_Context *queue_context
);
/** @} */
#ifdef __cplusplus
}
#endif
#endif
/* end of include file */
|
