Function mi_segment_abandon

3rd/mimalloc-2.0.9/src/segment.c:1217–1247

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static void mi_segment_abandon(mi_segment_t* segment, mi_segments_tld_t* tld) {
  mi_assert_internal(segment->used == segment->abandoned);
  mi_assert_internal(segment->used > 0);
  mi_assert_internal(mi_atomic_load_ptr_relaxed(mi_segment_t, &segment->abandoned_next) == NULL);
  mi_assert_internal(segment->abandoned_visits == 0);
  mi_assert_expensive(mi_segment_is_valid(segment,tld));
  
  // remove the free pages from the free page queues
  mi_slice_t* slice = &segment->slices[0];
  const mi_slice_t* end = mi_segment_slices_end(segment);
  while (slice < end) {
    mi_assert_internal(slice->slice_count > 0);
    mi_assert_internal(slice->slice_offset == 0);
    if (slice->xblock_size == 0) { // a free page
      mi_segment_span_remove_from_queue(slice,tld);
      slice->xblock_size = 0; // but keep it free
    }
    slice = slice + slice->slice_count;
  }

  // perform delayed decommits
  mi_segment_delayed_decommit(segment, mi_option_is_enabled(mi_option_abandoned_page_decommit) /* force? */, tld->stats);    
  
  // all pages in the segment are abandoned; add it to the abandoned list
  _mi_stat_increase(&tld->stats->segments_abandoned, 1);
  mi_segments_track_size(-((long)mi_segment_size(segment)), tld);
  segment->thread_id = 0;
  mi_atomic_store_ptr_release(mi_segment_t, &segment->abandoned_next, NULL);
  segment->abandoned_visits = 1;   // from 0 to 1 to signify it is abandoned
  mi_abandoned_push(segment);
}

void _mi_segment_page_abandon(mi_page_t* page, mi_segments_tld_t* tld) {
  mi_assert(page != NULL);