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/**
* @file
*
* @ingroup RTEMSImplClassicSemaphore
*
* @brief Classic Semaphore Manager 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/semdata.h>
#include <rtems/score/coremuteximpl.h>
#include <rtems/score/coresemimpl.h>
#include <rtems/score/mrspimpl.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @defgroup RTEMSImplClassicSemaphore Semaphore Manager
*
* @ingroup RTEMSImplClassic
*
* @brief This group contains the Semaphore Manager implementation.
*
* @{
*/
/**
* @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;
RTEMS_INLINE_ROUTINE uintptr_t _Semaphore_Get_flags(
const Semaphore_Control *the_semaphore
)
{
_Assert( _Chain_Is_node_off_chain( &the_semaphore->Object.Node ) );
return (uintptr_t) the_semaphore->Object.Node.previous;
}
RTEMS_INLINE_ROUTINE void _Semaphore_Set_flags(
Semaphore_Control *the_semaphore,
uintptr_t flags
)
{
_Assert( _Chain_Is_node_off_chain( &the_semaphore->Object.Node ) );
the_semaphore->Object.Node.previous = (Chain_Node *) flags;
}
RTEMS_INLINE_ROUTINE Semaphore_Variant _Semaphore_Get_variant(
uintptr_t flags
)
{
return (Semaphore_Discipline) ( flags & 0x7 );
}
RTEMS_INLINE_ROUTINE uintptr_t _Semaphore_Set_variant(
uintptr_t flags,
Semaphore_Variant variant
)
{
return flags | variant;
}
RTEMS_INLINE_ROUTINE Semaphore_Discipline _Semaphore_Get_discipline(
uintptr_t flags
)
{
return (Semaphore_Discipline) ( ( flags >> 3 ) & 0x1 );
}
RTEMS_INLINE_ROUTINE uintptr_t _Semaphore_Set_discipline(
uintptr_t flags,
Semaphore_Discipline discipline
)
{
return flags | ( discipline << 3 );
}
#if defined(RTEMS_MULTIPROCESSING)
RTEMS_INLINE_ROUTINE bool _Semaphore_Is_global(
uintptr_t flags
)
{
return ( flags & 0x10 ) != 0;
}
RTEMS_INLINE_ROUTINE uintptr_t _Semaphore_Make_global( uintptr_t flags )
{
return flags | 0x10;
}
#endif
RTEMS_INLINE_ROUTINE const Thread_queue_Operations *_Semaphore_Get_operations(
uintptr_t flags
)
{
if (
_Semaphore_Get_variant( flags ) == SEMAPHORE_VARIANT_MUTEX_INHERIT_PRIORITY
) {
return &_Thread_queue_Operations_priority_inherit;
}
if ( _Semaphore_Get_discipline( flags ) == 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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