Saving and restoring traversal state attributes of a directed ac

Details Saving and restoring traversal state attributes of a directed ac Saving and restoring traversal state attributes of a directed ac

1992-10-13

1995-07-04

Kulik, Paul V.

Boots, shoes, and leggings

395160, 364DIG1, G06F 1730

Patent

active

054308704

ABSTRACT:
A set in structure (SIS) list is established for each DAG structure of a DAG structure network. Additionally, a used before set (UBS) list is established for each structure invoking element in the DAG data structure. At each invocation of a DAG structure, a list of traversal state list (TSL) attribute values that need to saved and subsequently restored (SAR) for the invoking DAG data structure is established. The SAR list of an invoked DAG data structure is established based on a list of attributes needed by the invoking DAG data structure (N) and the SIS of the invoked DAG data structure. The N list is established based on the UBS list of the invoking structure element of the invoking DAG structure, and a need from child (NFC) attribute list of the invoking DAG data structure. Only values of the TSL attributes included in the SAR list are saved before the invoked DAG data structure is traversed. The saved TSL attribute values are restored for the invoking DAG data structure, when the invoked DAG data structure is exited. As a result unnecessary savings and restorings of TSL attributes for the invoking DAG data structure are avoided.

REFERENCES:
patent: 4870599 (1989-09-01), Hempel et al.
patent: 5093917 (1992-03-01), Campbell et al.
patent: 5119477 (1992-06-01), Ebbers
patent: 5182797 (1993-01-01), Liang et al.
patent: 5261097 (1993-11-01), Saxon
Rost et al., "PEX: A Network-Transparent 3D Graphics System", IEEE Computer Graphics & Applications, Jul. 1989, pp. 14-26.

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