diff options
Diffstat (limited to 'nuttx/mm/mm_shrinkchunk.c')
| -rw-r--r-- | nuttx/mm/mm_shrinkchunk.c | 139 |
1 files changed, 0 insertions, 139 deletions
diff --git a/nuttx/mm/mm_shrinkchunk.c b/nuttx/mm/mm_shrinkchunk.c deleted file mode 100644 index e538e43ed..000000000 --- a/nuttx/mm/mm_shrinkchunk.c +++ /dev/null @@ -1,139 +0,0 @@ -/**************************************************************************** - * mm/mm_shrinkchunk.c - * - * Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * 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. - * 3. Neither the name NuttX nor the names of its contributors may be - * used to endorse or promote products derived from this software - * without specific prior written permission. - * - * 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. - * - ****************************************************************************/ - -/**************************************************************************** - * Included Files - ****************************************************************************/ - -#include "mm_environment.h" -#include "mm_internal.h" - -/**************************************************************************** - * Pre-processor Definitions - ****************************************************************************/ - -/**************************************************************************** - * Global Functions - ****************************************************************************/ - -/**************************************************************************** - * Name: mm_shrinkchunk - * - * Description: - * Reduce the size of the chunk specified by the node structure to the - * specified size. this internal logic is used both from memalign to - * dispose of any trailing memory in the aligned allocation and also by - * realloc when there is a request to reduce the size of an allocation. - * - * NOTES: - * (1) size is the whole chunk size (payload and header) - * (2) the caller must hold the MM semaphore. - * - ****************************************************************************/ - -void mm_shrinkchunk(FAR struct mm_allocnode_s *node, size_t size) -{ - FAR struct mm_freenode_s *next; - - /* Get a reference to the next node */ - - next = (FAR struct mm_freenode_s*)((char*)node + node->size); - - /* Check if it is free */ - - if ((next->preceding & MM_ALLOC_BIT) == 0) - { - FAR struct mm_allocnode_s *andbeyond; - FAR struct mm_freenode_s *newnode; - - /* Get the chunk next the next node (which could be the tail chunk) */ - - andbeyond = (FAR struct mm_allocnode_s*)((char*)next + next->size); - - /* Remove the next node. There must be a predecessor, but there may - * not be a successor node. - */ - - DEBUGASSERT(next->blink); - next->blink->flink = next->flink; - if (next->flink) - { - next->flink->blink = next->blink; - } - - /* Create a new chunk that will hold both the next chunk and the - * tailing memory from the aligned chunk. - */ - - newnode = (FAR struct mm_freenode_s*)((char*)node + size); - - /* Set up the size of the new node */ - - newnode->size = next->size + node->size - size; - newnode->preceding = size; - node->size = size; - andbeyond->preceding = newnode->size | (andbeyond->preceding & MM_ALLOC_BIT); - - /* Add the new node to the freenodelist */ - - mm_addfreechunk(newnode); - } - - /* The next chunk is allocated. Try to free the end portion at the end - * chunk to be shrunk. - */ - - else if (node->size >= size + SIZEOF_MM_FREENODE) - { - FAR struct mm_freenode_s *newnode; - - /* Create a new chunk that will hold both the next chunk and the - * tailing memory from the aligned chunk. - */ - - newnode = (FAR struct mm_freenode_s*)((char*)node + size); - - /* Set up the size of the new node */ - - newnode->size = node->size - size; - newnode->preceding = size; - node->size = size; - next->preceding = newnode->size | MM_ALLOC_BIT; - - /* Add the new node to the freenodelist */ - - mm_addfreechunk(newnode); - } -} |