DispatchSourceMachSend
A dispatch source that monitors a Mach port for dead name notifications, indicating that a send right no longer has a corresponding receive right.
Declaration
protocol DispatchSourceMachSend : DispatchSourceProtocol, SendableOverview
You do not adopt this protocol in your objects. Instead, use the makeMachSendSource(port:eventMask:queue:) method to create an object that adopts this protocol.