Function _rpmalloc_span_map_from_reserve

source/extern/rpmalloc.c:1146–1158

Use reserved spans to fulfill a memory map request (reserve size must be checked by caller)

//! Use reserved spans to fulfill a memory map request (reserve size must be checked by caller)
static span_t*
_rpmalloc_span_map_from_reserve(heap_t* heap, size_t span_count) {
	//Update the heap span reserve
	span_t* span = heap->span_reserve;
	heap->span_reserve = (span_t*)pointer_offset(span, span_count * _memory_span_size);
	heap->spans_reserved -= (uint32_t)span_count;

	_rpmalloc_span_mark_as_subspan_unless_master(heap->span_reserve_master, span, span_count);
	if (span_count <= LARGE_CLASS_COUNT)
		_rpmalloc_stat_inc(&heap->span_use[span_count - 1].spans_from_reserved);

	return span;
}

//! Get the aligned number of spans to map in based on wanted count, configured mapping granularity and the page size
static size_t