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/*
* Object Handler
*
*
* COPYRIGHT (c) 1989-1999.
* 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.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/system.h>
#include <rtems/score/address.h>
#include <rtems/score/chain.h>
#include <rtems/score/object.h>
#if defined(RTEMS_MULTIPROCESSING)
#include <rtems/score/objectmp.h>
#endif
#include <rtems/score/thread.h>
#include <rtems/score/wkspace.h>
#include <rtems/score/sysstate.h>
#include <rtems/score/isr.h>
/*PAGE
*
* _Objects_Allocate
*
* DESCRIPTION:
*
* This function allocates a object control block from
* the inactive chain of free object control blocks.
*/
Objects_Control *_Objects_Allocate(
Objects_Information *information
)
{
Objects_Control *the_object;
/*
* If the application is using the optional manager stubs and
* still attempts to create the object, the information block
* should be all zeroed out because it is in the BSS. So let's
* check that code for this manager is even present.
*/
if ( information->size == 0 )
return NULL;
/*
* OK. The manager should be initialized and configured to have objects.
* With any luck, it is safe to attempt to allocate an object.
*/
the_object = (Objects_Control *) _Chain_Get( &information->Inactive );
if ( information->auto_extend ) {
/*
* If the list is empty then we are out of objects and need to
* extend information base.
*/
if ( !the_object ) {
_Objects_Extend_information( information );
the_object = (Objects_Control *) _Chain_Get( &information->Inactive );
}
if ( the_object ) {
uint32_t block;
block = (uint32_t) _Objects_Get_index( the_object->id ) -
_Objects_Get_index( information->minimum_id );
block /= information->allocation_size;
information->inactive_per_block[ block ]--;
information->inactive--;
}
}
return the_object;
}
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