/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSScoreFreechain
*
* @brief This source file contains the implementation of
* _Freechain_Extend(), _Freechain_Get(), and _Freechain_Put().
*/
/*
* Copyright (c) 2013 Gedare Bloom.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/freechainimpl.h>
#include <rtems/score/assert.h>
void *_Freechain_Extend(
Freechain_Control *freechain,
Freechain_Allocator allocator,
size_t number_nodes_to_extend,
size_t node_size
)
{
void *starting_address;
starting_address = ( *allocator )( number_nodes_to_extend * node_size );
number_nodes_to_extend *= ( starting_address != NULL );
_Chain_Initialize(
&freechain->Free,
starting_address,
number_nodes_to_extend,
node_size
);
return starting_address;
}
void *_Freechain_Get(
Freechain_Control *freechain,
Freechain_Allocator allocator,
size_t number_nodes_to_extend,
size_t node_size
)
{
_Assert( node_size >= sizeof( Chain_Node ) );
if ( _Chain_Is_empty( &freechain->Free ) && number_nodes_to_extend > 0 ) {
_Freechain_Extend(
freechain,
allocator,
number_nodes_to_extend,
node_size
);
}
return _Chain_Get_unprotected( &freechain->Free );
}
void _Freechain_Put( Freechain_Control *freechain, void *node )
{
if ( node != NULL ) {
_Freechain_Push( freechain, node );
}
}
