Function myfree

src/myalloc.c:240–310

}

void myfree(void *p){
	struct mempage **prevpage, *page;
	int i;
	unsigned pagesize;
	unsigned size, j, k;
	
	alloced--;
#if DEBUGLEVEL == 2
fprintf(stderr, "free %p\n", p);
fflush(stderr);
#endif
	pthread_mutex_lock(&mem_mutex);
	i = myfindsize(p, &prevpage, &page);
	if (i == nomem) {
#if DEBUGLEVEL > 2
fprintf(stderr, "Page does not exists, trying free()\n");
fflush(stderr);
#endif
		pthread_mutex_unlock(&mem_mutex);
		free(p);
		return;
	}
	pagesize = memsizes[i];
#if DEBUGLEVEL > 2
fprintf(stderr, "Calculated pagesize: %u\n", pagesize);
fflush(stderr);
#endif
	size = (unsigned)((unsigned char*)p - page->data);
	if(size%pagesize) {
#if DEBUGLEVEL > 0
write(2, p, 4);
fprintf(stderr, "\nGiven address is not block aligned, ignoring\n");
fflush(stderr);
#endif
		pthread_mutex_unlock(&mem_mutex);
		return; /* Hmmmmm */
	}
	*prevpage = page->next;
	page->usable += pagesize;
#if DEBUGLEVEL > 2
fprintf(stderr, "New usable space: %u\n", page->usable);
fflush(stderr);
#endif
	if(page->usable >= MEM64K && ((pagesize == MEM64K) || (pages[i] && pages[i]->usable))) {
#if DEBUGLEVEL > 2
fprintf(stderr, "Free this page\n");
fflush(stderr);
#endif
		free(page);
	}
	else {
		j = (size>>11);
		k = ((size & 0x000007FF) >> 8);
		k = ('\01'<<k);
		if(page->bitmap[j] & k) {
#if DEBUGLEVEL > 0
fprintf(stderr, "Error: double free() %d/%d/%d\n", j, k, page->bitmap[j]);
fflush(stderr);