Globally incremented variable or clock based methods and apparatus to implement parallel transactions

A computer system comprising:

• a processor;
• a memory unit that stores instructions associated with an application executed by the processor;
• and
• an interconnect coupling the processor and the memory unit, enabling the computer system to execute the application and perform operations of:
• accessing globally accessible shared data to execute a corresponding transaction of multiple transactions being executed in parallel with each other, the globally accessible shared data accessible by each of the multiple transactions;
• accessing a globally accessible version information variable indicating when the globally accessible shared data was last modified and utilized by each of multiple processes executing the multiple transactions to maintain version information associated with the globally accessible shared data, the globally accessible version information variable accessible by each of the multiple transactions;
• and
• after completion of the corresponding transaction, initiating at least one of mode A and mode B, wherein mode A includes:
• for the corresponding transaction, storing a current value of the globally accessible version information regardless of whether an associated attempt by the corresponding transaction to modify the globally accessible version information variable was successful, the current value used by the corresponding transaction for maintaining the version information associated with the globally accessible shared data, and
• wherein mode B includes:
• for the corresponding transaction, retrieving a current value of the globally accessible version information variable for maintaining the version information associated with the globally accessible shared data.

A computer program product including a computer-readable storage medium having instructions stored thereon for processing data information, such that the instructions, when carried out by a processing device, enable the processing device to:

• access globally accessible shared data to execute a corresponding transaction of multiple transactions being executed in parallel with each other, the globally accessible shared data accessible by each of the multiple transactions;
• access a globally accessible version information variable indicating when the globally accessible shared data was last mofified and utilized by each of multiple processes executing the multiple transactions to maintain version information associated with the globally accessible shared data, the globally accessible version information variable accessible by each of the multiple transactions;
• and
• after completion of the corresponding transaction, initiating at least one of mode A and mode B, wherein mode A includes:
• for the corresponding transaction, storing a current value of the globally accessible version information regardless of whether an associated attempt by the corresponding transaction to modify the globally accessible version information variable was successful, the current value used by the corresponding transaction for maintaining the version information associated with the globally accessible shared data, and
• wherein mode B includes:
• for the corresponding transaction, retrieving a current value of the globally accessible version information variable for maintaining the version information associated with the globally accessible shared data.