Compact disc player with fragment memory management

Details Compact disc player with fragment memory management Compact disc player with fragment memory management

1992-06-26

1995-04-04

Black, Thomas G.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 32, 369 47, G06F 1520

Patent

active

054045118

ABSTRACT:
An application module of a data processing apparatus requires various quantities of memory space for the buffering of data to be processed. In particular, image and audio files are to be read from a CD-ROM disc and decoded in real-time. The operating system provides a memory manager to allocate buffer space from the available memory. To alleviate the problem of fragmentation, a fragmented memory manager module secures at the outset an allocation of buffer space sufficient for all requirements of the application module, and partitions the allocation into small units of buffer space (fragments), which are linked into a list by respective list pointers. Any subsequent requirement for buffer space is met by the fragmented memory manager, by un-linking the requisite number of fragments from the list of unallocated fragments. The application module is adapted to use fragmented buffer space where possible, while the allocation of buffer space in contiguous blocks is not excluded when necessary.

REFERENCES:
patent: 4912629 (1990-03-01), Shuler
patent: 5109336 (1992-04-01), Guenther
patent: 5148527 (1992-09-01), Basso
Wilson, "Uniprocessor Garbage Collection Techniques", Proceedings: Memory Management. International Workshop IWMM 92, pp. 1-42 (Springer Verlag Sep. 23, 1992).
Edited by Philips International & published by Kluwer Technical Books, ISBN 90 201-21103, entitled: "CD-I: A Designer's Overview", Chapter 7 1987.
P. Dibble, "OS-9 Insights: An Advanced Programmers Guide to OS-9/68000", Chapters 3 & 4, published by Microwave Systems Corporation, ISBN 0-918035-0105 1991.

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