G - Physics – 06 – F
Patent
G - Physics
06
F
354/230
G06F 9/32 (2006.01) G06F 9/445 (2006.01)
Patent
CA 1175153
- 23 - METHOD AND APPARATUS FOR INTRODUCING PROGRAM CHANGES IN PROGRAM-CONTROLLED SYSTEMS Abstract An arrangement for using either an original program or a modified version of the program in a program- controlled system. Each time a modified version of a selected program function is stored in the system, it is tagged with a function sequence number and the original program function is retained in the system. Each time a program process is initiated, it is tagged with a process sequence number. The two types of sequence numbers are assigned from a common source. Whenever the selected program function is called by a program process, a comparison is made between the process sequence number and the function sequence number. If the comparison indicates that the process was initiated before the modification was stored in the system, the original version of the selected program function is executed; otherwise; the modified version of the selected program is executed. Thus, either the original version or the modified version is available consistently throughout the active life of a process.
416058
Bishop Thomas P.
Picus Susan J.
Kirby Eades Gale Baker
Western Electric Company Incorporated
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