IEEE 1003.1j-2000
Portable Operating System Interface (POSIX(TM))--Part 1: System Application Program Interface (API)--Amendment 5: Advanced Realtime Extensions [C Language]
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Language: English
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About This Item
1003.1j-2000 is an IEEE POSIX amendment that defines Advanced Realtime Extensions for the System Application Program Interface (API) in the C language. It is aimed at software and system behavior where timing predictability, responsive execution, and controlled interaction with operating-system services are important. For engineers working with components, circuits, devices, and systems that depend on reliable realtime software interfaces, this standard helps clarify requirements and supports more consistent implementation and evaluation.
Overview of 1003.1j-2000
IEEE 1003.1j-2000 extends the POSIX API framework with realtime capabilities intended for C-language applications. Its focus is on defining standardized behavior for advanced realtime extensions so that software can be written and tested against a clearer technical baseline. As a superseded standard, it remains relevant for understanding earlier POSIX realtime requirements, legacy system designs, and procurement or compliance work where historical versions of 1003.1 are still referenced.
Typical use cases
This technical document is commonly used when developing or maintaining embedded controllers, industrial automation software, communication equipment, and other systems that need predictable response times. It may also support integration work for applications that coordinate tasks, events, or timing-sensitive operations through the POSIX API in C. In practice, 1003.1j-2000 is useful for teams comparing legacy realtime behavior across platforms or verifying whether an implementation aligns with the expected interface model.
Why it matters
For organizations that depend on timing-sensitive software, 1003.1j-2000 can help reduce ambiguity in design and testing. A defined API baseline supports more consistent compliance checks, better interoperability between implementations, and clearer documentation during system procurement or maintenance. Because realtime extensions often affect performance and responsiveness, having a stable reference can lower integration risk and make technical reviews more straightforward, especially when working with legacy POSIX-based environments.
- POSIX realtime API extension
- C language interface focus
- Advanced timing-related behavior
- Superseded IEEE 1003.1 family reference
- Publication Date: 2000
- Standard Status: Superseded
- Publisher: IEEE
- Subject: Components, Circuits, Devices and Systems
- Official IEEE: Doi link
- New Version Available: 1003.1 (2024)
- Previous Version: 1003.1 (2018)
- Previous Version: 1003.1 (2016)
- Previous Version: 1003.1 (2016)
- Previous Version: 1003.1 (2013)
- Previous Version: 1003.1 (2013)
- Previous Version: 1003.1 (2008)
- Previous Version: 1003.1 (2004)
- Previous Version: 1003.1 (2004)
- Previous Version: 1003.1 (2003)
- Previous Version: 1003.1 (2001)
- Previous Version: 1003.1 (2001)
- This Version: 1003.1 (2000)
- Previous Version: 1003.1 (1999)
- Previous Version: 1003.1 (1994)
- Previous Version: 1003.1 (1994)
- Previous Version: 1003.1 (1988)
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