Method and apparatus for concurrency control of shared data upda

Details Method and apparatus for concurrency control of shared data upda Method and apparatus for concurrency control of shared data upda

1990-04-27

1993-10-19

Lee, Thomas C.

Boots, shoes, and leggings

395425, 3642814, 3642817, 3642281, 364DIG1, G06F 1540

Patent

active

052553876

ABSTRACT:
Method and apparatus for shared data update and query operations. Two control fields are associated with each data block of interest. Before any data in shared memory is modified, a value different from the present value is written into one of the shared memory control fields. The shared memory data is then updated. Thereafter, the other shared memory control field is updated to the new value, thus making the values of the shared memory control fields identical once again. During query operations, the data and control fields of interest are copied into in private storage. The values of the control fields in private memory are compared. If the values are equal, the data in private storage is considered to be consistent. Otherwise, the data is considered to be in the process of being updated and the data is ignored until the values of the shared memory control fields become equal.

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