Electrical computers and digital data processing systems: input/ – Input/output data processing – Input/output access regulation
Reexamination Certificate
2011-08-09
2011-08-09
Chan, Eddie P (Department: 2183)
Electrical computers and digital data processing systems: input/
Input/output data processing
Input/output access regulation
C710S037000, C712S010000, C712S015000
Reexamination Certificate
active
07996585
ABSTRACT:
Disclosed are a method and system of tracking real time use of I/O control blocks on a processing unit basis, in a multiprocessing system, such that in the case of a processing unit failure, a list accurately and concisely identifies the control blocks that need to be recovered. This eliminates the need to scan all the I/O control blocks, greatly reducing the overall system recovery time and minimizing impact to the rest of the running system. The preferred embodiment of the invention uses a task control block structure to record which I/O control blocks are in use by each Processing Unit. Also, the lock word structure defined in the I/O control blocks is provided with an index back into the task control block to facilitate managing the task control block entries.
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Easton Janet R.
Nass Elke
Oakes Kenneth J.
Piechowski Andrew W.
Taubert Martin
Campbell John E.
Chan Eddie P
Giroux George D
International Business Machines - Corporation
Scully , Scott, Murphy & Presser, P.C.
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