Function _mi_page_abandon

3rd/mimalloc-2.0.9/src/page.c:366–392

Abandon a page with used blocks at the end of a thread. Note: only call if it is ensured that no references exist from the `page->heap->thread_delayed_free` into this page. Currently only called through `mi_heap_collect_ex` which ensures this.

// the `page->heap->thread_delayed_free` into this page.
// Currently only called through `mi_heap_collect_ex` which ensures this.
void _mi_page_abandon(mi_page_t* page, mi_page_queue_t* pq) {
  mi_assert_internal(page != NULL);
  mi_assert_expensive(_mi_page_is_valid(page));
  mi_assert_internal(pq == mi_page_queue_of(page));
  mi_assert_internal(mi_page_heap(page) != NULL);

  mi_heap_t* pheap = mi_page_heap(page);

  // remove from our page list
  mi_segments_tld_t* segments_tld = &pheap->tld->segments;
  mi_page_queue_remove(pq, page);

  // page is no longer associated with our heap
  mi_assert_internal(mi_page_thread_free_flag(page)==MI_NEVER_DELAYED_FREE);
  mi_page_set_heap(page, NULL);

#if MI_DEBUG>1
  // check there are no references left..
  for (mi_block_t* block = (mi_block_t*)pheap->thread_delayed_free; block != NULL; block = mi_block_nextx(pheap, block, pheap->keys)) {
    mi_assert_internal(_mi_ptr_page(block) != page);
  }
#endif

  // and abandon it
  mi_assert_internal(mi_page_heap(page) == NULL);
  _mi_segment_page_abandon(page,segments_tld);
}


// Free a page with no more free blocks