58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
|
/*******************************************************************************
|
||
|
|
|
||
|
|
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014.
|
||
|
|
|
||
|
|
This file is part of the Sortix C Library.
|
||
|
|
|
||
|
|
The Sortix C Library is free software: you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU Lesser General Public License as published by
|
||
|
|
the Free Software Foundation, either version 3 of the License, or (at your
|
||
|
|
option) any later version.
|
||
|
|
|
||
|
|
The Sortix C Library is distributed in the hope that it will be useful, but
|
||
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
||
|
|
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
||
|
|
License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Lesser General Public License
|
||
|
|
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
|
||
|
|
stdlib/free.cpp
|
||
|
|
Returns a chunk of memory to the dynamic memory heap.
|
||
|
|
|
||
|
|
*******************************************************************************/
|
||
|
|
|
||
|
|
#include <malloc.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
#if __is_sortix_kernel
|
||
|
|
#include <sortix/kernel/kernel.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if defined(HEAP_NO_ASSERT)
|
||
|
|
#define __heap_verify() ((void) 0)
|
||
|
|
#undef assert
|
||
|
|
#define assert(x) do { ((void) 0); } while ( 0 )
|
||
|
|
#endif
|
||
|
|
|
||
|
|
extern "C" void free(void* addr)
|
||
|
|
{
|
||
|
|
if ( !addr )
|
||
|
|
return;
|
||
|
|
|
||
|
|
__heap_lock();
|
||
|
|
__heap_verify();
|
||
|
|
|
||
|
|
// Retrieve the chunk that contains this allocation.
|
||
|
|
struct heap_chunk* chunk = heap_data_to_chunk((uint8_t*) addr);
|
||
|
|
|
||
|
|
// Return the chunk to the heap.
|
||
|
|
heap_insert_chunk(chunk);
|
||
|
|
|
||
|
|
// Combine the chunk with its left and right neighbors if they are unused.
|
||
|
|
heap_chunk_combine_neighbors(chunk);
|
||
|
|
|
||
|
|
__heap_verify();
|
||
|
|
__heap_unlock();
|
||
|
|
}
|