Transactional Memory Signal Interrupt Handling
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Solution Overview
Problem
Existing systems face challenges in handling signal interrupts during atomic transactions in transactional memory systems, leading to issues like transaction starvation, increased conflict probability, and infinite loop delays, which are not effectively addressed by conventional approaches.
Innovation Solution
A method that stores the state of signal interrupts during atomic transactions, allowing them to be processed after the transaction is completed or aborted, ensuring that interrupt handlers are executed only when safe and preventing operations that violate atomicity, thus avoiding premature interruption and ensuring timely signal handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the signal interrupt causes the atomic transaction to abort, then the interrupt can be processed, but the atomic transaction may be starved from completion for systems with frequent signal interrupts
Solution Approach 1:
The system performs preliminary action by saving the interrupt state and registration information before the atomic transaction completes, then restores and processes the interrupt after the transaction commits or aborts. This allows the interrupt to be handled without blocking the transaction execution, resolving the contradiction between reliable interrupt handling and transaction completion.
2Loss of time
If the signal is allowed to interrupt the atomic transaction, then the interrupt can be processed immediately, but the atomic transaction is delayed and more prone to conflicts resulting in aborts, rollbacks, and retries
Solution Approach 1:
The interrupt processing is extracted from the atomic transaction execution flow. The interrupt state is saved and stored separately, then the transaction continues execution without interruption. After the transaction completes, the interrupt is processed outside the transaction context. This separation eliminates the delay and conflict issues while maintaining timely interrupt handling.
3Ease of operation
If signals are blocked across all atomic transactions, then interrupt handling is simplified, but system calls to block signals are computationally expensive and atomic transactions with infinite loops can block signal interrupts indefinitely
Solution Approach 1:
The system performs preliminary action by saving the interrupt state and registration information at the beginning of the atomic transaction, then processes the interrupt after the transaction completes. This avoids the need for blocking signals during transaction execution, eliminating the computational overhead of signal blocking system calls and preventing infinite loop problems.
Data Source
AI summary
In some embodiments, a method includes executing an atomic transaction in a system having a transactional memory. The method includes receiving a signal interrupt during executing of the atomic transaction. The method includes storing a state of the signal interrupt to enable subsequent execution of the signal interrupt. The method includes returning to executing the atomic transaction until the atomic transaction is at least one of completed and aborted. The method includes after executing the atomic transaction is at least one of completed and aborted, determining whether the signal interrupt is received during executing of the atomic transaction. The method includes after determining that the signal interrupt is received during executing of the atomic transaction, retrieving the state of the signal interrupt. The method includes executing an interrupt handler for processing the signal interrupt and returning from executing of the atomic transaction.