Function _rpmalloc_heap_cache_adopt_deferred

source/extern/rpmalloc.c:1593–1633

Adopt the deferred span cache list, optionally extracting the first single span for immediate re-use

//! Adopt the deferred span cache list, optionally extracting the first single span for immediate re-use
static void
_rpmalloc_heap_cache_adopt_deferred(heap_t* heap, span_t** single_span) {
	span_t* span = (span_t*)((void*)atomic_exchange_ptr_acquire(&heap->span_free_deferred, 0));
	while (span) {
		span_t* next_span = (span_t*)span->free_list;
		rpmalloc_assert(span->heap == heap, "Span heap pointer corrupted");
		if (EXPECTED(span->size_class < SIZE_CLASS_COUNT)) {
			rpmalloc_assert(heap->full_span_count, "Heap span counter corrupted");
			--heap->full_span_count;
			_rpmalloc_stat_dec(&heap->span_use[0].spans_deferred);
#if RPMALLOC_FIRST_CLASS_HEAPS
			_rpmalloc_span_double_link_list_remove(&heap->full_span[span->size_class], span);
#endif
			_rpmalloc_stat_dec(&heap->span_use[0].current);
			_rpmalloc_stat_dec(&heap->size_class_use[span->size_class].spans_current);
			if (single_span && !*single_span)
				*single_span = span;
			else
				_rpmalloc_heap_cache_insert(heap, span);
		} else {
			if (span->size_class == SIZE_CLASS_HUGE) {
				_rpmalloc_deallocate_huge(span);
			} else {
				rpmalloc_assert(span->size_class == SIZE_CLASS_LARGE, "Span size class invalid");
				rpmalloc_assert(heap->full_span_count, "Heap span counter corrupted");
				--heap->full_span_count;
#if RPMALLOC_FIRST_CLASS_HEAPS
				_rpmalloc_span_double_link_list_remove(&heap->large_huge_span, span);
#endif
				uint32_t idx = span->span_count - 1;
				_rpmalloc_stat_dec(&heap->span_use[idx].spans_deferred);
				_rpmalloc_stat_dec(&heap->span_use[idx].current);
				if (!idx && single_span && !*single_span)
					*single_span = span;
				else
					_rpmalloc_heap_cache_insert(heap, span);
			}
		}
		span = next_span;
	}
}

static void
_rpmalloc_heap_unmap(heap_t* heap) {