No, if the memory-mapped page you're accessing is in RAM, then you're just reading the RAM; there is no page fault and no syscall and nothing blocks.
You could say that any non-register memory access "blocks" but I feel that's needlessly confusing. Normal async code doesn't "block" in any relevant sense when it accesses the heap.
You could say that any non-register memory access "blocks" but I feel that's needlessly confusing. Normal async code doesn't "block" in any relevant sense when it accesses the heap.