Real-time operating system (RTOS) - definition

Real-Time Operating System (RTOS) is specialised software that manages the resources of a computer system in such a way as to provide deterministic and predictable handling of tasks within a well-defined time frame. Its key feature is its ability to respond to external events within a guaranteed timeframe, which distinguishes it from general purpose systems that optimise average performance but do not provide tight control over latency.

The RTOS is responsible for scheduling, synchronisation and communication between processes, interrupt handling and memory management in environments where the timing of operations is critical to the correctness of the entire system. Tasks are prioritised and processor scheduling is typically based on algorithms such as preemptive scheduling, which allows higher-priority tasks to immediately take over resources.

Real-time systems are divided into hard real-time and soft real-time, depending on whether exceeding the set time constraints leads to a critical error or merely degrades the quality of performance. RTOS are used in embedded devices, industrial automation, robotics, flight control systems, medical apparatus, as well as data transmission and multimedia systems requiring low latency.

RTOSes are typically optimised for minimal system overhead, low resource consumption and high reliability. Examples of such environments include FreeRTOS, VxWorks, RTEMS or QNX. Their design takes into account strict timing requirements, fault tolerance and the ability to operate under power or memory constraints, making them the foundation for modern embedded systems with high levels of operational criticality.

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