By Tony Hoare (auth.), Peter Müller (eds.)
Software defects result in huge, immense charges for the software program and society as an entire. whereas checking out turns out to be useful to discover insects, it's inadequate to teach the absence of convinced forms of mistakes or application satisfies its specification. Such excessive degrees of software program caliber may be accomplished via software program verification, that's, by way of proving the correctness of a software with admire to its specification. software program verification has noticeable great development over the past decade; it remains to be an lively learn subject and is now additionally turning into more and more well known between practitioners. This instructional comprises chosen papers from the LASER summer time faculties 2007 and 2008, either one of which involved in correctness - utilized software program Verification in 2007 and Concurrency and Correctness in 2008. issues coated comprise verification of fine-grain concurrency and transactions, the inside track version for concurrent object-oriented programming, the Spec# programming and verification approach, verification within the prototype verification procedure PVS, and multi-core chip design.
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Additional info for Advanced Lectures on Software Engineering: LASER Summer School 2007/2008
Every feature call happens in the context of a feature application. For this reason we will start with the description of the feature application and then describe the feature call. In the end we will present an example to illustrate once again how the two concepts work together. In terms of contracts, this section only describes the runtime aspects of contracts. A more detailed picture will be given in section 7. 23 of the Eiﬀel ECMA standard . 1 Feature Application We start in a situation where a processor p wants to apply a feature request f on a target x.
Therefore it is necessary to obtain request queue locks prior to the execution of a feature so that these request queues can be accessed during the execution. There might be more than one processor whose current feature request requires a particular lock. This is where the scheduler comes into place. The scheduler is the arbiter for feature requests. More details on this will be given in section 5. The model permits a number of possible scheduling algorithms. Scheduling algorithms diﬀer in their level of fairness and their performance.
Both producers and consumers operate on a shared buﬀer attached to buﬀer. The type separate BOUNDED QUEUE[G] of these two features is of interest. SCOOP 45 The class type BOUNDED QUEUE[G] speciﬁes the nature of the buﬀer: It is a bounded queue with elements of a type G. The keyword separate is a SCOOP speciﬁc addition to the type system. In SCOOP every object is associated to a processor that is responsible for the sequential execution of instructions on that object. One object can only be associated to one processor, but one processor can be responsible for multiple objects.
Advanced Lectures on Software Engineering: LASER Summer School 2007/2008 by Tony Hoare (auth.), Peter Müller (eds.)