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/**
* @file apiext.h
*
* This is the API Extensions Handler.
*/
/*
* COPYRIGHT (c) 1989-2004.
* 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.
*
* $Id$
*/
#ifndef __API_EXTENSIONS_h
#define __API_EXTENSIONS_h
/**
* @defgroup ScoreAPIExtension API Extension Handler
*
* This group contains functionality which provides mechanisms for the
* SuperCore to perform API specific actions without there being
* "up-references" from the SuperCore to APIs. If these references
* were allowed in the implementation, the cohesion would be too high
* and adding an API would be more difficult. The SuperCore is supposed
* to be largely independent of any API.
*/
/**@{*/
#include <rtems/score/chain.h>
#include <rtems/score/thread.h>
/**
* This type defines the prototype of the Predriver Hook.
*/
typedef void (*API_extensions_Predriver_hook)(void);
/**
* This type defines the prototype of the Postdriver Hook.
*/
typedef void (*API_extensions_Postdriver_hook)(void);
/**
* This type defines the prototype of the Postswitch Hook.
*/
typedef void (*API_extensions_Postswitch_hook)(
Thread_Control *
);
/**
* The control structure which defines the points at which an API
* can add an extension to the system initialization thread.
*/
typedef struct {
/** This field allows this structure to be used with the Chain Handler. */
Chain_Node Node;
/**
* This field is the callout invoked during RTEMS initialization after
* RTEMS data structures are initialized before device driver initialization
* has occurred.
*
* @note If this field is NULL, no extension is invoked.
*/
API_extensions_Predriver_hook predriver_hook;
/**
* This field is the callout invoked during RTEMS initialization after
* RTEMS data structures and device driver initialization has occurred
* but before multitasking is initiated.
*
* @note If this field is NULL, no extension is invoked.
*/
API_extensions_Postdriver_hook postdriver_hook;
/**
* This field is the callout invoked during each context switch
* in the context of the heir thread.
*
* @note If this field is NULL, no extension is invoked.
*/
API_extensions_Postswitch_hook postswitch_hook;
} API_extensions_Control;
/**
* This is the list of API extensions to the system initialization.
*/
SCORE_EXTERN Chain_Control _API_extensions_List;
/**
* This routine initializes the API extension handler.
*/
void _API_extensions_Initialization( void );
/**
* This routine adds an extension to the active set of API extensions.
*
* @param the_extension (in) is the extension set to add.
*/
void _API_extensions_Add(
API_extensions_Control *the_extension
);
/**
* This routine executes all of the predriver callouts.
*/
void _API_extensions_Run_predriver( void );
/**
* This routine executes all of the postdriver callouts.
*/
void _API_extensions_Run_postdriver( void );
/**
* This routine executes all of the post context switch callouts.
*/
*/
void _API_extensions_Run_postswitch( void );
/**@}*/
#endif
/* end of include file */
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