Real-time response and a/an RTOS are not the same thing. An RTOS only allows processes with a known (or computable) runtime to run so that it may make guarante

Real-time response and a/an RTOS are not the same thing. An RTOS only allows processes with a known (or computable) runtime to run so that it may make guarantees about timing of execution. In some RTOSes scheduling may be entirely static and determined at compile time. This type of OS is used in critical systems (aircraft, hospital equipment, nuclear bombs). It's not really the type of system you'd want for a general purpose operating system.