Preconcurrency (Swift 6) way of monitoring memory pressure in Swift

DispatchMemoryPressure.swift

@discardableResult
@preconcurrency func logMemoryPressure() -> DispatchSourceProtocol {
	let source = DispatchSource.makeMemoryPressureSource(eventMask: .all, queue: nil)
	let queue = DispatchQueue(
		label: "com.example.memoryPressure")
	queue.async {
		source.setEventHandler {
			guard !source.isCancelled else { return }
			let event = source.data

			switch event {
				case .normal:
					os_log("Memory pressure: %{public}s", log: .default, type: .debug, "normal")
				case .warning:
					os_log("Memory pressure: %{public}s", log: .default, type: .info, "warning")
				case .critical:
					os_log("Memory pressure: %{public}s", log: .default, type: .error, "critical")
				default:
					break
			}
		}

		os_log("Memory pressure logging start", log: .default, type: .debug)
		source.activate()
	}

	return source
}