Appeal No. 1997-1933
Application No. 08/299,715
subsequently released in response to an indicator being set,
prior to completion of the transaction. Claim 12 is
illustrative of the claimed invention, and it reads as
follows:
12. A method of fault-tolerant transaction-oriented data
processing in which resource updates performed by processes
within a transaction are backed out atomically following
occurrence of a failure before resolution of said transaction,
or are committed on successful completion of said transaction,
said method comprising the steps of:
for each resource updating operation to be performed
within said transaction, obtaining a mutually exclusive
semaphore lock for a resource which is to be updated;
performing a resource updating operation within said
transaction in response to an operation request;
setting an indicator signifying that said resource
updating operation has been performed within said transaction,
said indicator making said operation request inaccessible to
said processes;
in response to said indicator being set, releasing said
mutually exclusive semaphore lock prior to completion of said
transaction;
in response to successful completion of said transaction,
committing all operations within said transaction for which
said indicator has been set; and
in response to an occurrence of a failure before
resolution of said transaction, backing out all operations
within said transaction for which said indicator has been set.
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