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/*
* COPYRIGHT (c) 1989-2007.
* 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/isr.h>
/*
* _Chain_Get
*
* This kernel routine returns a pointer to a node taken from the
* given chain.
*
* Input parameters:
* the_chain - pointer to chain header
*
* Output parameters:
* return_node - pointer to node in chain allocated
* CHAIN_END - if no nodes available
*
* INTERRUPT LATENCY:
* only case
*/
Chain_Node *_Chain_Get(
Chain_Control *the_chain
)
{
ISR_Level level;
Chain_Node *return_node;
return_node = NULL;
_ISR_Disable( level );
if ( !_Chain_Is_empty( the_chain ) )
return_node = _Chain_Get_first_unprotected( the_chain );
_ISR_Enable( level );
return return_node;
}
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