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{{short description|Study of hardware and software systems that have a "real-time constraint"}}
{{More footnotes|date=April 2014}}
{{distinguish|text=[[Real-time communication]] or [[Real-time clock]], closely related technologies that are also often abbreviated to RTC}}
'''Real-time computing''' ('''RTC''') is the [[computer science]] term for [[Computer hardware|hardware]] and [[computer software|software]] systems subject to a "real-time constraint", for example from [[Event (synchronization primitive)|event]] to [[Event (computing)|system response]].<ref>{{Cite web|title=FreeRTOS - Open Source RTOS Kernel for small embedded systems - What is FreeRTOS FAQ?|url=https://www.freertos.org/FAQWhat.html#WhyUseRTOS|access-date=2021-03-08|website=FreeRTOS|language=en-US}}</ref> Real-time programs must guarantee response within specified time constraints, often referred to as "deadlines".<ref name="Ben-Ari-pg164">[[Mordechai Ben-Ari|Ben-Ari, Mordechai]]; "Principles of Concurrent and Distributed Programming", ch. 16, Prentice Hall, 1990, {{ISBN|0-13-711821-X}}, page 164</ref>
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