Compare Swap Store Facility Without External Serialization
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Solution Overview
Problem
Existing compare and swap instructions cannot be intermixed with perform locked operations, requiring external serialization for data integrity, limiting flexibility and efficiency in processing environments.
Innovation Solution
A compare and swap facility that performs a compare and swap operation using an interlocked update, allowing for a subsequent store operation without relying on external serialization, ensuring all operations appear as a single unit to the processor and preventing interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If perform locked operation is used to maintain data integrity, then data integrity is ensured, but device complexity increases and operations cannot be intermixed with compare and swap instructions
Solution Approach 1:
The patent merges the compare and swap operation with the store operation into a single atomic instruction sequence. The compare and swap facility performs the comparison, conditional swap, and store operations as one integrated unit, eliminating the need for separate perform locked operations and external serialization mechanisms.
Solution Approach 2:
The compare and swap facility provides its own internal serialization mechanism through the interlocked update operation, making the system self-sufficient. The facility manages its own data integrity without requiring external lock operations or additional serialization functions.
2Reliability
If perform locked operation is used for compare and swap, then data integrity is maintained, but productivity decreases due to inability to intermix operations
Solution Approach 1:
By combining compare and swap with store operations into a single atomic instruction, the patent enables these operations to be executed together without requiring separate perform locked operations, thereby improving processing efficiency and productivity while maintaining data integrity.
Solution Approach 2:
The compare and swap facility ensures continuous execution of operations without interruption from external serialization. The atomic nature of the instruction sequence allows uninterrupted processing, improving productivity while maintaining data integrity through the interlocked update mechanism.
3Reliability
If external serialization is used, then data integrity is ensured, but adaptability decreases as operations cannot be intermixed
Solution Approach 1:
The patent integrates multiple operations (compare, swap, store) into a single atomic instruction, providing versatility and adaptability. This merged operation can be used in various contexts without requiring external serialization, enabling flexible operation mixing while maintaining data integrity.
Solution Approach 2:
The compare and swap facility provides multi-functional capability by performing comparison, conditional swapping, and store operations within a single instruction. This universal operation can replace multiple separate operations, enhancing adaptability while ensuring data integrity through the interlocked update mechanism.
Data Source
AI summary
A compare, swap and store facility is provided that does not require external serialization. A compare and swap operation is performed using an interlocked update operation. If the comparison indicates equality, a store operation is performed. The compare, swap and store operations are performed as a single unit of operation.