MinSeong KIM

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Papers by MinSeong KIM

Asynchronous event handling and Safety Critical Java

Concurrency and Computation: Practice and Experience, 2011

Structure  Threads or event handling  Why JSR 302 decided to use event handlers  The JSR 302 c... more Structure  Threads or event handling  Why JSR 302 decided to use event handlers  The JSR 302 concurrency model  Known inconsistencies in the model  Revised model  Conclusions Concurrency Models: Threads  Support standardised across OSs  Supported in most real-time languages  Well established and problems well understood  real-time scheduling  priority inversion control  deadlocks (if use locks)  composability and scalability

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Applying fixed‐priority preemptive scheduling with preemption threshold to asynchronous event handling in the RTSJ

Concurrency and Computation: Practice and Experience, 2010

The primary goal of asynchronous event handlers (handlers for short) in the Real‐Time Specificati... more The primary goal of asynchronous event handlers (handlers for short) in the Real‐Time Specification for Java (RTSJ) is to have a lightweight concurrency mechanism. The emphasis here is on ‘lightweightness’ which should be achieved by having fewer real‐time threads (servers for short) to execute more handlers. However, it is generally unclear how to efficiently map handlers to servers. In this paper we first define the worst case scenario that demands the least upper bound of servers for self‐suspending and non‐self‐suspending handlers. Based on the worst case scenarios, it is proved that the number of servers required to execute a given number of non‐self‐suspending handlers depends on the number of priority levels, and not on the number of handlers. It is also shown that each self‐suspending handler is required to have its own server to prevent unbounded priority inversion. Based on these results we also propose to adapt the notion of preemption threshold to further minimize the nu...

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Using the executor framework to implement asynchronous event handling in the RTSJ

Proceedings of the 8th International Workshop on Java Technologies for Real-Time and Embedded Systems, 2010

Abstract The concurrency utilities in the Java library supply a feature called the executor frame... more

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