A type of dispatch source for monitoring a mach receive port.
- iOS 4.0+
- macOS 10.6+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
A dispatch source that monitors a Mach port for pending messages. The handle is a Mach port with a receive right (
mach). The mask is unused (pass zero for now).