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/* priority.h
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*
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* This include file contains all thread priority manipulation routines.
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* This Handler provides mechanisms which can be used to
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* initialize and manipulate thread priorities.
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*
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* COPYRIGHT (c) 1989-1999.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.OARcorp.com/rtems/license.html.
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*
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* $Id: priority.h,v 1.2 2001-09-27 11:59:32 chris Exp $
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*/
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#ifndef __PRIORITY_h
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#define __PRIORITY_h
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* The following type defines the control block used to manage
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* thread priorities.
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*
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* NOTE: Priority 0 is reserved for internal threads only.
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*/
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typedef unsigned32 Priority_Control;
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#define PRIORITY_MINIMUM 0 /* highest thread priority */
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#define PRIORITY_MAXIMUM 255 /* lowest thread priority */
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/*
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* The following record defines the information associated with
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* each thread to manage its interaction with the priority bit maps.
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*/
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typedef struct {
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Priority_Bit_map_control *minor; /* addr of minor bit map slot */
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Priority_Bit_map_control ready_major; /* priority bit map ready mask */
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Priority_Bit_map_control ready_minor; /* priority bit map ready mask */
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Priority_Bit_map_control block_major; /* priority bit map block mask */
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Priority_Bit_map_control block_minor; /* priority bit map block mask */
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} Priority_Information;
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/*
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* The following data items are the priority bit map.
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* Each of the sixteen bits used in the _Priority_Major_bit_map is
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* associated with one of the sixteen entries in the _Priority_Bit_map.
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* Each bit in the _Priority_Bit_map indicates whether or not there are
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* threads ready at a particular priority. The mapping of
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* individual priority levels to particular bits is processor
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* dependent as is the value of each bit used to indicate that
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* threads are ready at that priority.
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*/
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SCORE_EXTERN volatile Priority_Bit_map_control _Priority_Major_bit_map;
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SCORE_EXTERN Priority_Bit_map_control
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_Priority_Bit_map[16] CPU_STRUCTURE_ALIGNMENT;
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/*
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* The definition of the Priority_Bit_map_control type is CPU dependent.
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*
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*/
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/*
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* Priority Bitfield Manipulation Routines
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*
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* NOTE:
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*
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* These may simply be pass throughs to CPU dependent routines.
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*/
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#if ( CPU_USE_GENERIC_BITFIELD_CODE == FALSE )
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#define _Priority_Mask( _bit_number ) \
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_CPU_Priority_Mask( _bit_number )
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#define _Priority_Bits_index( _priority ) \
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_CPU_Priority_bits_index( _priority )
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#endif
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#ifndef __RTEMS_APPLICATION__
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#include <rtems/score/priority.inl>
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif
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/* end of include file */
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