134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
/*
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* Copyright (c) 2006, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)$Id: malloc_compact.c,v 1.1 2008/08/15 19:05:17 adamdunkels Exp $
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*/
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#include <stdlib.h>
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#include <string.h>
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#ifdef MALLOC_TEST
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#include "malloc.h"
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#else
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#include "contiki.h"
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#include "lib/malloc.h"
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#endif /* !MALLOC_TEST */
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#define handle nx
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void
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malloc_unlock(void **h)
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{
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struct __freelist *t = *h;
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t = &t[-1];
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t->handle = (void *)h;
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}
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void
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malloc_lock(void **h)
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{
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struct __freelist *t = *h;
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t = &t[-1];
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t->handle = NULL;
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}
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static int
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compact1(struct __freelist **flp)
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{
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struct __freelist *fp = *flp, *fp2;
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struct __freelist *ap1, *ap2;
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struct __freelist *end = (struct __freelist *)__brkval;
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ap1 = (void *)(((char *)fp) + sizeof(struct __freelist) + fp->sz);
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if (ap1 >= end)
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return 0;
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if (ap1->handle == NULL)
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return 0;
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ap2 = (void *)(((char *)ap1) + sizeof(struct __freelist) + ap1->sz);
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fp2 = fp->nx;
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if (ap2 != fp2) { /* 2 blocks become 2 */
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size_t s = fp->sz;
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fp->sz = ap1->sz;
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fp->handle = ap1->handle;
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memcpy(&fp[1], &ap1[1], ap1->sz);
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*(void **)(fp->handle) = &fp[1];
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fp = (void *)(((char *)fp) + sizeof(struct __freelist) + fp->sz);
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fp->sz = s;
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fp->nx = fp2;
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*flp = fp;
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return 1;
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}
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if (ap2 == fp2) { /* 3 blocks become 2 */
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size_t s = fp->sz + fp2->sz + sizeof(struct __freelist);
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fp->sz = ap1->sz;
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fp->handle = ap1->handle;
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memcpy(&fp[1], &ap1[1], ap1->sz);
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*(void **)(fp->handle) = &fp[1];
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fp = (void *)(((char *)fp) + sizeof(struct __freelist) + fp->sz);
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fp->sz = s;
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fp->nx = fp2->nx;
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*flp = fp;
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return 1;
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}
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return 0;
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}
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void
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malloc_compact(void)
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{
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struct __freelist **flp;
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flp = &__flp;
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while (*flp != NULL) {
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while (compact1(flp))
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;
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flp = &((*flp)->nx);
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}
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}
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void
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malloc_compact_one(void)
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{
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struct __freelist **flp;
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flp = &__flp;
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while (*flp != NULL) {
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if (compact1(flp))
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return ;
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flp = &((*flp)->nx);
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}
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}
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