Design of Multithreaded Software: The Entity-Life Modeling by Bo I. Sandén

By Bo I. Sandén

This booklet assumes familiarity with threads (in a language akin to Ada, C#, or Java) and introduces the entity-life modeling (ELM) layout process for sure different types of multithreaded software program. ELM specializes in "reactive systems," which consistently engage with the matter surroundings. those "reactive structures" comprise embedded platforms, in addition to such interactive platforms as cruise controllers and automatic teller machines.Part I covers basics: program-language thread aid and country diagramming. those are priceless for realizing ELM and are supplied basically for reference. half II covers ELM from various angles. half III positions ELM relative to different layout techniques.

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Any block in any operation can be synchronized on any object as follows: synchronized (Expression) {/* Block B */} Expression must evaluate to a reference to some object, say vo of class V. Like a synchronized operation, a synchronized block is a critical section, and the compiler automatically brackets the block with statements to acquire and release the lock on vo. Consider first the case where B is part of some operation, m, on class V and is synchronized on the current object as follows: class V … { void m( ){ synchronized (this) { /* Block B*/ } } } The above works if not all of m requires exclusive access.

We are interested in classes of objects that the software must (1) maintain data about, (2) interface to, or (3) both. Each class is shown as a box with three compartments: name, attributes, and operations. When attributes and/or operations are irrelevant, each of the latter compartments can be suppressed. op (parameters)—to stress that obj is not just another parameter but an object whose service is invoked. The class diagram in Figure 1-1 shows the concrete signal classes read-card, press-open, and trip-sensor as specializations of an abstract signal class opening-event.

14Some are now part of an underground hacker culture (Conti, 2005). 15Per the ―principle of deferred invention,‖ free innovation should be delayed until the description of what is already given has been completed (Jackson, 1995). 16Dogs, cats, and cattle are actors, too, when they operate some automatic feeding device or the like. They are, of course, nonhuman yet animate actors. ‖ It initiates use cases that are to start automatically at specific times. , 2003). An active object has a thread (sometimes called a body) that serves various request queues and performs the requested operations on the object.

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