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/*
* RTEMS Malloc Family Implementation
*
*
* 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
#ifdef RTEMS_NEWLIB
#include <stdlib.h>
#include <errno.h>
#include "malloc_p.h"
void *malloc(
size_t size
)
{
void *return_this;
void *starting_address;
uint32_t the_size;
uint32_t sbrk_amount;
Chain_Node *to_be_freed;
MSBUMP(malloc_calls, 1);
if ( !size )
return (void *) 0;
#if defined(RTEMS_HEAP_DEBUG)
_Protected_heap_Walk( &RTEMS_Malloc_Heap, 0, FALSE );
#endif
/*
* Do not attempt to allocate memory if in a critical section or ISR.
*/
if (_System_state_Is_up(_System_state_Get())) {
if (_Thread_Dispatch_disable_level > 0)
return (void *) 0;
if (_ISR_Nest_level > 0)
return (void *) 0;
}
/*
* If some free's have been deferred, then do them now.
*/
while ((to_be_freed = Chain_Get(&RTEMS_Malloc_GC_list)) != NULL)
free(to_be_freed);
#if defined(RTEMS_MALLOC_BOUNDARY_HELPERS)
/*
* If the support for a boundary area at the end of the heap
* block allocated is turned on, then adjust the size.
*/
if (rtems_malloc_boundary_helpers)
size += (*rtems_malloc_boundary_helpers->overhead)();
#endif
/*
* Try to give a segment in the current heap if there is not
* enough space then try to grow the heap.
* If this fails then return a NULL pointer.
*/
return_this = _Protected_heap_Allocate( &RTEMS_Malloc_Heap, size );
if ( !return_this ) {
/*
* Round to the "requested sbrk amount" so hopefully we won't have
* to grow again for a while. This effectively does sbrk() calls
* in "page" amounts.
*/
sbrk_amount = RTEMS_Malloc_Sbrk_amount;
if ( sbrk_amount == 0 )
return (void *) 0;
the_size = ((size + sbrk_amount) / sbrk_amount * sbrk_amount);
if ((starting_address = (void *)sbrk(the_size))
== (void*) -1)
return (void *) 0;
if ( !_Protected_heap_Extend(
&RTEMS_Malloc_Heap, starting_address, the_size) ) {
sbrk(-the_size);
errno = ENOMEM;
return (void *) 0;
}
MSBUMP(space_available, the_size);
return_this = _Protected_heap_Allocate( &RTEMS_Malloc_Heap, size );
if ( !return_this ) {
errno = ENOMEM;
return (void *) 0;
}
}
/*
* If the user wants us to dirty the allocated memory, then do it.
*/
#ifdef MALLOC_DIRTY
(void) memset(return_this, 0xCF, size);
#endif
/*
* If configured, update the statistics
*/
if ( rtems_malloc_statistics_helpers )
(*rtems_malloc_statistics_helpers->at_malloc)(return_this);
#if defined(RTEMS_MALLOC_BOUNDARY_HELPERS)
/*
* If configured, set the boundary area
*/
if (rtems_malloc_boundary_helpers)
(*rtems_malloc_boundary_helpers->at_malloc)(return_this, size);
#endif
return return_this;
}
#endif
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