Method and apparatus for dynamic extension of channel programs

Details Method and apparatus for dynamic extension of channel programs Method and apparatus for dynamic extension of channel programs

1997-10-24

2000-01-04

Auve, Glenn A.

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral configuration

710 38, 710 5, 710 6, 39550048, G06F 900

Patent

active

060121041

ABSTRACT:
The present invention provides a method, system, and computer program product for extending channel programs in a computer system which uses a channel sub-system. An initial channel program is built to end with a terminating channel command word (CCW) followed by a dummy CCW. When required, a new channel program is built separately, then the dummy CCW in the initial channel program is modified to transfer channel execution to the new channel program. Once modification of the dummy CCW is completed, the terminating CCW in the initial channel program is modified to allow the newly-built transfer CCW to execute.

REFERENCES:
patent: 5367661 (1994-11-01), Hough et al.
patent: 5584039 (1996-12-01), Johnson et al.
IBM Technical Disclosure, vol. 35, No. 5, Efficient ESA/370 Read Channel Programming, pp. 107-115, Oct. 1992.
IBM Technical Disclosure Bulletin, vol. 29, No. 1 Jun., 1986, pp. 273-275, "Interrupt-Free Interprocessor Communications", SPI Database of Software Technologies.
IBM Technical Disclosure Bulletin, Aug. 1976, pp. 849-852, "Processor to Processor Communications Mechanism", SPI Database of Software Technologies.
Efficient ESA/370 Read Channel Programming, IBM Technical Disclosure Bulletin, No. 5, Oct., 1992, pp. 107-115.

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