IEEE 1003.1d-1999
Portable Operating System Interface (POSIX)-Part 1: System Application Program Interface (API)- Amendment D: Additional Real time Extensions [C Language]
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About This Item
1003.1d-1999 is the IEEE 1003.1d-1999 amendment to the Portable Operating System Interface (POSIX) System Application Program Interface, focused on additional real-time extensions in the C language. It is relevant for software and system design where predictable timing and real-time behavior matter, especially in component-level computing environments. This technical document helps define interface expectations more clearly, supporting consistency in implementation, testing, and compatibility across POSIX-based systems.
What is 1003.1d-1999?
This standard is part of the POSIX family and extends the core system application program interface with real-time capabilities. 1003.1d-1999 addresses additional requirements for C language interfaces used by application developers and system engineers who need more deterministic control over process behavior, scheduling-related functions, and time-sensitive operations. As a superseded document, it is still useful as a reference for legacy compliance, archived specifications, and historical technical comparison within IEEE 1003.1-related work.
Where is 1003.1d-1999 used?
1003.1d-1999 is generally used in operating system and embedded software contexts where POSIX interfaces are implemented with real-time extensions. That may include industrial controllers, communication systems, and other engineered platforms that depend on consistent timing and structured API behavior. It is also relevant in software procurement and engineering documentation when comparing POSIX-compatible environments or maintaining older systems that were designed around IEEE 1003.1 real-time requirements.
Why is 1003.1d-1999 important?
This standard matters because real-time software often depends on predictable interface definitions and clear implementation rules. Using 1003.1d-1999 as a reference can help teams reduce ambiguity in design, improve consistency in testing, and support controlled maintenance of legacy POSIX-based systems. For organizations working with compliance, integration, or long-term support, it provides a documented basis for understanding the intended behavior of additional real-time extensions in the C language environment.
- POSIX real-time extensions
- C language API definitions
- Legacy IEEE 1003.1 reference
- Deterministic system behavior
- Compatibility and compliance review
- Publication Date: 1999
- Standard Status: Superseded
- Publisher: IEEE
- Subject: Components, Circuits, Devices and Systems
- Official IEEE: Doi link
- New Version Available: 1003.1 (2024)
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- Previous Version: 1003.1 (2001)
- Previous Version: 1003.1 (2000)
- This Version: 1003.1 (1999)
- Previous Version: 1003.1 (1994)
- Previous Version: 1003.1 (1994)
- Previous Version: 1003.1 (1988)
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