mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-08-29 13:29:09 +00:00
134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
|
/*
|
||
|
* Copyright (c) 2006, Swedish Institute of Computer Science
|
||
|
* All rights reserved.
|
||
|
*
|
||
|
* 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 of the Institute 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 INSTITUTE 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 INSTITUTE 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.
|
||
|
*
|
||
|
* @(#)$Id: malloc_compact.c,v 1.1 2006/06/17 22:41:18 adamdunkels Exp $
|
||
|
*/
|
||
|
|
||
|
#include <stdlib.h>
|
||
|
#include <string.h>
|
||
|
|
||
|
#ifdef MALLOC_TEST
|
||
|
#include "malloc.h"
|
||
|
#else
|
||
|
#include "contiki.h"
|
||
|
#include "lib/malloc.h"
|
||
|
#endif /* !MALLOC_TEST */
|
||
|
|
||
|
#define handle nx
|
||
|
|
||
|
void
|
||
|
malloc_unlock(void **h)
|
||
|
{
|
||
|
struct __freelist *t = *h;
|
||
|
t = &t[-1];
|
||
|
t->handle = (void *)h;
|
||
|
}
|
||
|
|
||
|
void
|
||
|
malloc_lock(void **h)
|
||
|
{
|
||
|
struct __freelist *t = *h;
|
||
|
t = &t[-1];
|
||
|
t->handle = NULL;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
compact1(struct __freelist **flp)
|
||
|
{
|
||
|
struct __freelist *fp = *flp, *fp2;
|
||
|
struct __freelist *ap1, *ap2;
|
||
|
struct __freelist *end = (struct __freelist *)__brkval;
|
||
|
|
||
|
ap1 = (void *)(((char *)fp) + sizeof(struct __freelist) + fp->sz);
|
||
|
if (ap1 >= end)
|
||
|
return 0;
|
||
|
if (ap1->handle == NULL)
|
||
|
return 0;
|
||
|
|
||
|
ap2 = (void *)(((char *)ap1) + sizeof(struct __freelist) + ap1->sz);
|
||
|
fp2 = fp->nx;
|
||
|
|
||
|
if (ap2 != fp2) { /* 2 blocks become 2 */
|
||
|
size_t s = fp->sz;
|
||
|
|
||
|
fp->sz = ap1->sz;
|
||
|
fp->handle = ap1->handle;
|
||
|
memcpy(&fp[1], &ap1[1], ap1->sz);
|
||
|
*(void **)(fp->handle) = &fp[1];
|
||
|
|
||
|
fp = (void *)(((char *)fp) + sizeof(struct __freelist) + fp->sz);
|
||
|
fp->sz = s;
|
||
|
fp->nx = fp2;
|
||
|
*flp = fp;
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
if (ap2 == fp2) { /* 3 blocks become 2 */
|
||
|
size_t s = fp->sz + fp2->sz + sizeof(struct __freelist);
|
||
|
|
||
|
fp->sz = ap1->sz;
|
||
|
fp->handle = ap1->handle;
|
||
|
memcpy(&fp[1], &ap1[1], ap1->sz);
|
||
|
*(void **)(fp->handle) = &fp[1];
|
||
|
|
||
|
fp = (void *)(((char *)fp) + sizeof(struct __freelist) + fp->sz);
|
||
|
fp->sz = s;
|
||
|
fp->nx = fp2->nx;
|
||
|
*flp = fp;
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
void
|
||
|
malloc_compact(void)
|
||
|
{
|
||
|
struct __freelist **flp;
|
||
|
|
||
|
flp = &__flp;
|
||
|
while (*flp != NULL) {
|
||
|
while (compact1(flp))
|
||
|
;
|
||
|
flp = &((*flp)->nx);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
void
|
||
|
malloc_compact_one(void)
|
||
|
{
|
||
|
struct __freelist **flp;
|
||
|
|
||
|
flp = &__flp;
|
||
|
while (*flp != NULL) {
|
||
|
if (compact1(flp))
|
||
|
return ;
|
||
|
flp = &((*flp)->nx);
|
||
|
}
|
||
|
}
|