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/**
* @file
*
* @ingroup ClassicSem
*
* @brief Classic Semaphores Implementation
*/
/* 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_RTEMS_SEMIMPL_H
#define _RTEMS_RTEMS_SEMIMPL_H
#include <rtems/rtems/sem.h>
#include <rtems/score/coremuteximpl.h>
#include <rtems/score/coresemimpl.h>
#include <rtems/score/mrspimpl.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Classic semaphore variants.
*
* Must be in synchronization with Semaphore_Control::variant.
*/
typedef enum {
SEMAPHORE_VARIANT_MUTEX_INHERIT_PRIORITY,
SEMAPHORE_VARIANT_MUTEX_PRIORITY_CEILING,
SEMAPHORE_VARIANT_MUTEX_NO_PROTOCOL,
SEMAPHORE_VARIANT_SIMPLE_BINARY,
SEMAPHORE_VARIANT_COUNTING
#if defined(RTEMS_SMP)
,
SEMAPHORE_VARIANT_MRSP
#endif
} Semaphore_Variant;
typedef enum {
SEMAPHORE_DISCIPLINE_PRIORITY,
SEMAPHORE_DISCIPLINE_FIFO
} Semaphore_Discipline;
/**
* The following defines the information control block used to manage
* this class of objects.
*/
extern Objects_Information _Semaphore_Information;
RTEMS_INLINE_ROUTINE const Thread_queue_Operations *_Semaphore_Get_operations(
const Semaphore_Control *the_semaphore
)
{
if ( the_semaphore->variant == SEMAPHORE_VARIANT_MUTEX_INHERIT_PRIORITY ) {
return &_Thread_queue_Operations_priority_inherit;
}
if ( the_semaphore->discipline == SEMAPHORE_DISCIPLINE_PRIORITY ) {
return &_Thread_queue_Operations_priority;
}
return &_Thread_queue_Operations_FIFO;
}
/**
* @brief Allocates a semaphore control block from
* the inactive chain of free semaphore control blocks.
*
* This function allocates a semaphore control block from
* the inactive chain of free semaphore control blocks.
*/
RTEMS_INLINE_ROUTINE Semaphore_Control *_Semaphore_Allocate( void )
{
return (Semaphore_Control *) _Objects_Allocate( &_Semaphore_Information );
}
/**
* @brief Frees a semaphore control block to the
* inactive chain of free semaphore control blocks.
*
* This routine frees a semaphore control block to the
* inactive chain of free semaphore control blocks.
*/
RTEMS_INLINE_ROUTINE void _Semaphore_Free (
Semaphore_Control *the_semaphore
)
{
_Objects_Free( &_Semaphore_Information, &the_semaphore->Object );
}
RTEMS_INLINE_ROUTINE Semaphore_Control *_Semaphore_Get(
Objects_Id id,
Thread_queue_Context *queue_context
)
{
_Thread_queue_Context_initialize( queue_context );
return (Semaphore_Control *) _Objects_Get(
id,
&queue_context->Lock_context.Lock_context,
&_Semaphore_Information
);
}
#ifdef __cplusplus
}
#endif
#ifdef RTEMS_MULTIPROCESSING
#include <rtems/rtems/semmp.h>
#endif
#endif
/* end of include file */
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