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/**
* @file
*
* @ingroup RTEMSImplClassicPartition
*
* @brief This source file contains the implementation of
* rtems_partition_return_buffer().
*/
/*
* COPYRIGHT (c) 1989-2014.
* 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.org/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/rtems/partimpl.h>
#include <rtems/score/address.h>
#include <rtems/score/chainimpl.h>
static bool _Partition_Is_address_on_buffer_boundary(
const Partition_Control *the_partition,
const void *the_buffer
)
{
intptr_t offset;
offset = _Addresses_Subtract(
the_buffer,
the_partition->base_address
);
return ( offset % the_partition->buffer_size ) == 0;
}
static bool _Partition_Is_address_a_buffer_begin(
const Partition_Control *the_partition,
const void *the_buffer
)
{
const void *base;
const void *limit;
base = the_partition->base_address;
limit = the_partition->limit_address;
if ( !_Addresses_Is_in_range( the_buffer, base, limit ) ) {
return false;
}
return _Partition_Is_address_on_buffer_boundary( the_partition, the_buffer );
}
static void _Partition_Free_buffer(
Partition_Control *the_partition,
void *the_buffer
)
{
_Chain_Append_unprotected( &the_partition->Memory, the_buffer );
}
rtems_status_code rtems_partition_return_buffer(
rtems_id id,
void *buffer
)
{
Partition_Control *the_partition;
ISR_lock_Context lock_context;
the_partition = _Partition_Get( id, &lock_context );
if ( the_partition == NULL ) {
#if defined(RTEMS_MULTIPROCESSING)
return _Partition_MP_Return_buffer( id, buffer );
#else
return RTEMS_INVALID_ID;
#endif
}
_Partition_Acquire_critical( the_partition, &lock_context );
if ( !_Partition_Is_address_a_buffer_begin( the_partition, buffer ) ) {
_Partition_Release( the_partition, &lock_context );
return RTEMS_INVALID_ADDRESS;
}
_Partition_Free_buffer( the_partition, buffer );
the_partition->number_of_used_blocks -= 1;
_Partition_Release( the_partition, &lock_context );
return RTEMS_SUCCESSFUL;
}
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