Download Advanced Lectures on Software Engineering: LASER Summer by Tony Hoare (auth.), Peter Müller (eds.) PDF

By Tony Hoare (auth.), Peter Müller (eds.)

Software defects result in huge, immense charges for the software program and society as a complete. whereas trying out comes in handy to discover insects, it's inadequate to teach the absence of yes different types of mistakes or software satisfies its specification. Such excessive degrees of software program caliber could be completed through software program verification, that's, via proving the correctness of a application with recognize to its specification. software program verification has visible large development over the last decade; it remains to be an lively study subject and is now additionally changing into more and more renowned between practitioners. This educational includes chosen papers from the LASER summer time colleges 2007 and 2008, either one of which excited about correctness - utilized software program Verification in 2007 and Concurrency and Correctness in 2008. subject matters coated contain 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 process PVS, and multi-core chip design.

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A more detailed picture will be given in section 7. 23 of the Eiffel ECMA standard [4]. 1 Feature Application We start in a situation where a processor p wants to apply a feature request f on a target x. The execution of f will require a number of request queue locks. SCOOP 53 Furthermore, the precondition of f must be satisfied before f can be executed. These two prerequisites are established in the synchronization step. This step involves the scheduler.

It also avoids race conditions at run time, and so prevents any form of unwanted interference between the activities of the threads. However, it also rules out any form of beneficial interaction or cooperation between them. In particular, it rules out any sharing of internal storage Compensable Transactions 37 or communication channels. A safe relaxation of this restriction is provided by atomic regions (or critical sections). This is defined as a section of code inside a thread, which is allowed to access and update a shared resource.

In this abstraction we call the request queue lock on a processor p simply the lock on p. As long as the call stack lock on a processor p is in possession of p, a request queue lock on p in possession of a processor q means that processor p will be executing new feature requests in the request queue exclusively on behalf of q. This means that a request queue lock grants exclusive access to all the objects handled by p. Transferring this insight to our abstractions, a lock on processor p denotes exclusive access to the objects handled by p.

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