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/**
* @file rtems/score/coresem.h
*
* @brief Data Associated with the Counting Semaphore Handler
*
* This include file contains all the constants and structures associated
* with the Counting Semaphore Handler. A counting semaphore is the
* standard Dijkstra binary semaphore used to provide synchronization
* and mutual exclusion capabilities.
*/
/*
* 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.com/license/LICENSE.
*/
#ifndef _RTEMS_SCORE_CORESEM_H
#define _RTEMS_SCORE_CORESEM_H
#include <rtems/score/tqdata.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @defgroup ScoreSemaphore Semaphore Handler
*
* @ingroup Score
*
* This handler encapsulates functionality which provides the foundation
* Semaphore services used in all of the APIs supported by RTEMS.
*/
/**@{*/
/**
* Blocking disciplines for a semaphore.
*/
typedef enum {
/** This specifies that threads will wait for the semaphore in FIFO order. */
CORE_SEMAPHORE_DISCIPLINES_FIFO,
/** This specifies that threads will wait for the semaphore in
* priority order.
*/
CORE_SEMAPHORE_DISCIPLINES_PRIORITY
} CORE_semaphore_Disciplines;
/**
* The following defines the control block used to manage the
* attributes of each semaphore.
*/
typedef struct {
/** This element indicates the maximum count this semaphore may have. */
uint32_t maximum_count;
/** This field indicates whether threads waiting on the semaphore block in
* FIFO or priority order.
*/
CORE_semaphore_Disciplines discipline;
} CORE_semaphore_Attributes;
/**
* The following defines the control block used to manage each
* counting semaphore.
*/
typedef struct {
/** This field is the Waiting Queue used to manage the set of tasks
* which are blocked waiting to obtain the semaphore.
*/
Thread_queue_Control Wait_queue;
/** This element is the set of attributes which define this instance's
* behavior.
*/
CORE_semaphore_Attributes Attributes;
/** This element contains the current count of this semaphore. */
uint32_t count;
} CORE_semaphore_Control;
/**@}*/
#ifdef __cplusplus
}
#endif
#endif
/* end of include file */
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