Download Inside Smalltalk by Wilf R. Lalonde, John R. Pugh PDF
By Wilf R. Lalonde, John R. Pugh
A quantity advisor to object-oriented programming that provides the smalltalk method as a robust and effective prototyping and improvement surroundings. quantity describes the Smalltalk periods that supply the frequent overlapping home windows, pop-up menus, and mouse interplay facility that characterizes the Smalltalk consumer interface. It additionally covers the model-view controller framework for the development of person interfaces. It beneficial properties the version view-controller paradigm for window-based purposes, and info person sessions, together with relationships among comparable periods and layout rationales. The publication is written for use in parallel with the Smalltalk method.
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Extra resources for Inside Smalltalk
Has the effect of placing it at the end of the queue of processes waiting execution at the same priority, thereby allowing other processes a turn at execution. interrogating and changing the processor state • • • Processor activeProcess Returns the process that is currently executing. , the process that is currently executing. Processor terminateActive Permanently removes the active process from execution. Relevant examples are provided in the next section dealing with window management. For the moment, we consider only simple toy examples.
ASponsor release Removes all dependents of aSponsor and returns aSponsor. aSponsor dependents Returns all dependents of aSponsor in an ordered collection. Sponsors can communicate with their dependents in three ways: (1) by broadcasting a zero- or one-parameter message, (2) by indicating that they have changed, or (3) by requesting that they be allowed to make a change. Dependents, on the other hand, react either to an update command or to a query by a sponsor asking for permission to modify itself.
ASemaphore critical: aBlock Permits the block to be executed only if no other critical block controlled by the same semaphore is executing; otherwise, causes the active process to suspend until the block can be executed. Technically, waits on the semaphore, executes the block, and then signals the semaphore. This semaphore should have been created using forMutuaiExclusion. Returns the result of the block. useful protocol inherited from LinkedList • • aSemaphore size Returns the number of processes waiting on the semaphore.