Real-Time Operating System (RTOS)

A real-time operating system (RTOS) is an operating system that guarantees a certain capability within a specified time constraint.

In general, real-time operating systems are said to require:

Process threads that can be prioritized
A sufficient number of interrupt levels

Real-time operating systems are often required in small embedded operating systems that are packaged as part of microdevices. A real-time operating system is usually larger than just the kernel.

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