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85 lines
2.4 KiB
C++
85 lines
2.4 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014, 2015.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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stdlib/free.cpp
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Returns a chunk of memory to the dynamic memory heap.
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*******************************************************************************/
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#include <malloc.h>
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#include <stdlib.h>
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#if defined(HEAP_NO_ASSERT)
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#define __heap_verify() ((void) 0)
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#undef assert
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#define assert(x) do { ((void) 0); } while ( 0 )
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#endif
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#if !defined(HEAP_GUARD_DEBUG)
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extern "C" void free(void* addr)
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{
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if ( !addr )
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return;
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__heap_lock();
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__heap_verify();
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// Retrieve the chunk that contains this allocation.
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struct heap_chunk* chunk = heap_data_to_chunk((uint8_t*) addr);
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// Return the chunk to the heap.
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heap_insert_chunk(chunk);
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// Combine the chunk with its left and right neighbors if they are unused.
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heap_chunk_combine_neighbors(chunk);
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__heap_verify();
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__heap_unlock();
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}
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#else
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#if defined(__is_sortix_kernel)
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#include <sortix/kernel/addralloc.h>
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#include <sortix/kernel/memorymanagement.h>
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#else
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#include <sys/mman.h>
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#endif
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extern "C" void free(void* addr)
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{
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if ( !addr )
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return;
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#if defined(__is_sortix_kernel)
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using namespace Sortix;
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addralloc_t* alloc_ptr = (addralloc_t*) Page::AlignDown((uintptr_t) addr - 16);
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assert(alloc_ptr->from == (uintptr_t) alloc_ptr);
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addralloc_t alloc = *alloc_ptr;
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Memory::UnmapRange(alloc.from, alloc.size - Page::Size(), PAGE_USAGE_KERNEL_HEAP);
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FreeKernelAddress(&alloc);
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#else
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struct heap_alloc* alloc_ptr =
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(struct heap_alloc*) HEAP_ALIGN_PAGEDOWN((uintptr_t) addr - 16);
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munmap((void*) alloc_ptr->from, alloc_ptr->size);
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#endif
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}
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#endif
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