Function mi_page_free_list_extend

3rd/mimalloc-2.0.9/src/page.c:556–580

}

static mi_decl_noinline void mi_page_free_list_extend( mi_page_t* const page, const size_t bsize, const size_t extend, mi_stats_t* const stats)
{
  MI_UNUSED(stats);
  #if (MI_SECURE <= 2)
  mi_assert_internal(page->free == NULL);
  mi_assert_internal(page->local_free == NULL);
  #endif
  mi_assert_internal(page->capacity + extend <= page->reserved);
  mi_assert_internal(bsize == mi_page_block_size(page));
  void* const page_area = _mi_page_start(_mi_page_segment(page), page, NULL );

  mi_block_t* const start = mi_page_block_at(page, page_area, bsize, page->capacity);

  // initialize a sequential free list
  mi_block_t* const last = mi_page_block_at(page, page_area, bsize, page->capacity + extend - 1);
  mi_block_t* block = start;
  while(block <= last) {
    mi_block_t* next = (mi_block_t*)((uint8_t*)block + bsize);
    mi_block_set_next(page,block,next);
    block = next;
  }
  // prepend to free list (usually `NULL`)
  mi_block_set_next(page, last, page->free);
  page->free = start;
}

/* -----------------------------------------------------------
  Page initialize and extend the capacity