diff options
Diffstat (limited to 'nuttx/mm/mm_addfreechunk.c')
-rw-r--r-- | nuttx/mm/mm_addfreechunk.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/nuttx/mm/mm_addfreechunk.c b/nuttx/mm/mm_addfreechunk.c new file mode 100644 index 000000000..fdda3ed8d --- /dev/null +++ b/nuttx/mm/mm_addfreechunk.c @@ -0,0 +1,91 @@ +/**************************************************************************** + * mm/mm_addfreechunk.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 + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Global Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: mm_addfreechunk + * + * Description: + * Add a free chunk to the node next. It is assumed that the caller holds + * the mm semaphore + * + ****************************************************************************/ + +void mm_addfreechunk(FAR struct mm_freenode_s *node) +{ + FAR struct mm_freenode_s *next; + FAR struct mm_freenode_s *prev; + + /* Convert the size to a nodelist index */ + + int ndx = mm_size2ndx(node->size); + + /* Now put the new node int the next */ + + for (prev = &g_nodelist[ndx], next = g_nodelist[ndx].flink; + next && next->size && next->size < node->size; + prev = next, next = next->flink); + + /* Does it go in mid next or at the end? */ + + prev->flink = node; + node->blink = prev; + node->flink = next; + + if (next) + { + /* The new node goes between prev and next */ + + next->blink = node; + } +} |