Experience with a prototype of the POSIX "minimal realtime system profile"

Baker, Theodore P.; Mueller, Frank; Rustagi, V.

doi:10.1109/rtoss.1994.292569

Cited by 11 publications

(1 citation statement)

References 5 publications

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“…Therefore it operates in a single virtual address space (no paging), it does not have a file system, and the only devices supported are a timer and a serial port. These simplifications eliminate unpredictable time delays due to page faults, waiting for completion of I/O, and I/O completion interrupt proeessing [2]. JTK offers a priority driven scheduler with pre-emption.…”

Section: The Architecture Of Jtkmentioning

confidence: 99%

Real-time programming with GNAT

1999

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The fact that most of the GNAT ports are based on non realtime operating systema leads to a reduced usability for developing real-time systems. Otherwise, existing ports over real-time operating systems are excessively complex, since GNAT uses only a reduced set of their functionality, and with a very specific semantic. This paper describes the implementation of a low-level tusking support for the GNAT run-time. In order to achieve a predictable real-time behaviour we have developed a very simple library, built to fit only the GNAT tasking requirements. We have also designed a bare machine kernel which provides the minimum environment needed by the upper layers.

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Section: The Architecture Of Jtkmentioning

confidence: 99%

Real-time programming with GNAT

1999

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Modeling of Multimedia Architectures: The Case of Videoconferencing with Guaranteed Quality of Service

Owezarski¹,

Boyer²

2009

Petri Nets

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The first characteristic which makes multimedia data different from classical computer data (text, binary data, …) is their computing unit: multimedia data consist of flows, while texts and binary data are handled as files. Indeed, audio and video data are sequences of images or audio samples which succeed each other with a constant or not rate. Multimedia data is not incompatible with the notion of computer file, and files are still used to save movies or audio documents; but the computing are made information unit by information unit (image by image, for instance); these information units, back to back, form a flow. Note however that texts, graphics and binary data can take advantage of this kind of computing.However, flows are also characterized by the temporal relationships which exist between the different information units. For example, it does not exist any temporal relationship between the characters which form a textual flow. Similarly for fix images which can be considered as bit flows, or for graphics, it does not exist any temporal relationships between the different units of the flow. These are typically discrete flows.At the opposite, for video or audio, images or audio samples must be produced, computed and presented at a regular rate. These are continuous flows (or streams). If the time interval between two consecutive flow units is constant, the flow is said isochronous; nevertheless, a given variability on these time intervals can be tolerated: this variability is called authorized jitter.

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