Asynchronous Counting Gate for Non-Blocking Resource Permits
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Solution Overview
Problem
Existing computing systems face challenges in managing access to resources without blocking threads while permit requests are pending, leading to inefficiencies and potential bottlenecks.
Innovation Solution
Implementing an asynchronous access control mechanism that allows threads to continue performing operations while permit requests are processed, using a queue for incomplete requests and a data structure to track status, with dynamic permit limits and instructions for completion scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thread blocks to wait for resource access permission, then resource access control is ensured, but thread productivity and resource utilization decrease
Solution Approach 1:
The patent segments the resource access control mechanism into multiple independent components: a permit counter for tracking active permits, a queue for managing waiting requests, and an asynchronous processing system. This segmentation allows the system to handle access control without blocking threads, as each component operates independently to manage permits and requests efficiently.
Solution Approach 2:
The patent introduces an intermediary asynchronous processing mechanism that mediates between resource requests and resource allocation. Instead of direct blocking, the system uses permit tokens as intermediaries that threads can acquire and release, allowing non-blocking access control while maintaining proper resource management through the permit counter and queue system.
2Reliability
If a thread blocks to wait for resource access permission, then resource access control is ensured, but resource utilization decreases
Solution Approach 1:
The patent enables continuous useful action by allowing threads to perform other productive operations while awaiting resource access. The asynchronous permit system maintains continuous resource utilization tracking through the permit counter, while threads remain active and can execute other tasks, eliminating idle blocking time and maximizing overall system productivity.
Solution Approach 2:
The system performs preliminary actions by pre-allocating permit tokens and maintaining a ready queue of permit requests before actual resource access is needed. This allows the system to prepare access control structures in advance, reducing the need for blocking operations and enabling smoother, more efficient resource utilization when permits become available.
3Productivity
If an asynchronous access control mechanism is implemented, then thread productivity increases, but system complexity increases
Solution Approach 1:
The patent implements a universal permit system that handles multiple functions through a single coherent mechanism: the permit counter tracks active accesses, the queue manages waiting requests, and the asynchronous processing handles permit allocation and release. This multi-functional design reduces overall system complexity compared to implementing separate mechanisms for each function.
Solution Approach 2:
The asynchronous permit system operates with a degree of self-service through automatic permit counter updates, queue management, and status tracking. The system self-regulates permit allocation based on current resource usage without requiring complex external coordination, reducing the operational complexity while maintaining high thread productivity.
Data Source
AI summary
Techniques are disclosed for restricting access to a computing resource in a manner that does not block the performance of other operations in a multi-thread computing environment. A software gate receives a request from a thread for permission to access a computing resource. Responsive to receiving the request, the software gate determines that a dynamic permit limit currently prevents the request from being granted. The software gate returns a data structure indicating that the request is incomplete, adds the request to a queue of pending requests, and releases the thread. Once released, the thread is free to perform other operations while the request is pending. If the request subsequently becomes allowable, the software gate grants the request, removes the request from the queue, and updates the data structure to indicate the request is complete.