Function mi_page_queue_enqueue_from

3rd/mimalloc-2.0.9/src/page-queue.c:258–294

static void mi_page_queue_enqueue_from(mi_page_queue_t* to, mi_page_queue_t* from, mi_page_t* page) {
  mi_assert_internal(page != NULL);
  mi_assert_expensive(mi_page_queue_contains(from, page));
  mi_assert_expensive(!mi_page_queue_contains(to, page));

  mi_assert_internal((page->xblock_size == to->block_size && page->xblock_size == from->block_size) ||
                     (page->xblock_size == to->block_size && mi_page_queue_is_full(from)) ||
                     (page->xblock_size == from->block_size && mi_page_queue_is_full(to)) ||
                     (page->xblock_size > MI_LARGE_OBJ_SIZE_MAX && mi_page_queue_is_huge(to)) ||
                     (page->xblock_size > MI_LARGE_OBJ_SIZE_MAX && mi_page_queue_is_full(to)));

  mi_heap_t* heap = mi_page_heap(page);
  if (page->prev != NULL) page->prev->next = page->next;
  if (page->next != NULL) page->next->prev = page->prev;
  if (page == from->last)  from->last = page->prev;
  if (page == from->first) {
    from->first = page->next;
    // update first
    mi_assert_internal(mi_heap_contains_queue(heap, from));
    mi_heap_queue_first_update(heap, from);
  }

  page->prev = to->last;
  page->next = NULL;
  if (to->last != NULL) {
    mi_assert_internal(heap == mi_page_heap(to->last));
    to->last->next = page;
    to->last = page;
  }
  else {
    to->first = page;
    to->last = page;
    mi_heap_queue_first_update(heap, to);
  }

  mi_page_set_in_full(page, mi_page_queue_is_full(to));
}

// Only called from `mi_heap_absorb`.
size_t _mi_page_queue_append(mi_heap_t* heap, mi_page_queue_t* pq, mi_page_queue_t* append) {