View source for Real-Time Computing

=External=

* https://en.wikipedia.org/wiki/Real-time_computing

=Internal=

* [[Software Architecture#Subjects|Software Architecture]]

=Overview=

A real-time system is subject to a "[[#Real-time_Constraint|real-time constraint]]" - a guaranteed response within a specified time constraint between event to system response. Real-time systems control an environment by receiving data, processing it, and returning the results sufficiently quickly to affect the environment at that time.

Formally, a system is said of be real-time if the correctness of an operation depends not only upon its logical correctness, but also upon the time in which the operation is performed. Real-time systems are classified by the consequences of missing a deadline:
* '''Hard''' Real-Time System - missing a deadline is a total system failure.
* '''Firm''' Real-Time System - infrequent deadline misses are tolerable, but may degrade the system's quality of service.

=Real-time Operating System=

{{External|https://en.wikipedia.org/wiki/Real-time_operating_system}}

An operating system intended to serve real-time applications that process data as it comes, without [[#Buffer_Delay|buffer delays]]. The system attempts to insure [[#Real-time_Constraint|the guaranteed response time]], possibly at the expense of the throughput.

=Real-time Constraint=

A ''real-time constraint'' is a guaranteed response within a specified time constraint between event to system response. Real-time constraints are also referred to as "deadlines". Deadlines must always be met, regardless of system load. The usefulness of a result is zero after its deadline.

=Buffer Delay=

=Jitter=