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learning the unix operating system 5th edition

Programming the Be Operating System-Chapter 9: Messages and Threads

Programming the Be Operating System-Chapter 9: Messages and Threads

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... with system messages—messages generatedand dispatched by the system. The Message Protocols appendix of the Be Bookdefines all the system messages. In short, system messages fall into the followingcategories:Application ... posted message becomes the next in the queue, the looper invokesDispatchMessage() to pass the message to the target handler. The effect is for the posted message to reach the target handler’s ... sev-eral examples of the creating of messages and the dispatching of these messagesboth by the object that created them and by other objects.Figure 9-1. The inheritance hierarchy for the Application...
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Programming the Be Operating System-Chapter 10: Files

Programming the Be Operating System-Chapter 10: Files

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... For the Save file panel, the display of the panel comes when the userchooses the Save As item from the File menu. In response to the message issuedby the system to the appropriate MessageReceived() ... control is in the hands of the user. Once the user confirms a choice (whether it’s a file selection in the Openfile panel, a click on the Save button in the Save file panel, or a click on the Can-cel ... in either type of panel), a message is automatically sent by the system to the panel’s target. By default the panel’s target is the application object, but thiscan be changed (either in the BFilePanel...
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Tài liệu Programming the Be Operating System-Chapter 1: BeOS Programming Overview ppt

Tài liệu Programming the Be Operating System-Chapter 1: BeOS Programming Overview ppt

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... during the execution of a program. Anobject can be added or deleted from the heap without regard for itsplacement in the heap, or for the other contents of the heap. The stack, on the other hand, ... such tasks. The zoom-ing and moving of windows is handled by the system, not by the SimpleApp code.This simple demonstration emphasizes the power of the BeOS system software—itis the system software ... window’s tab)• The type of the window (the look and feel of the window)• The behavior of the window (whether it has a resize knob, and so forth)Recall from your C++ background that when the definition...
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Tài liệu Programming the Be Operating System-Chapter 2: BeIDE Projects docx

Tài liệu Programming the Be Operating System-Chapter 2: BeIDE Projects docx

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... file with the same name as the project (andthus the same name as the application that will be built from the project). The header file holds the definition of the class derived from the BApplication ... anyresizing of the window. The final BView constructor parameter determines the types of notifications the view is to receive from the system. The Be constantB_WILL_DRAW means that the view should ... stated that the header file that bears the name of the project should hold the declaration of the project’s application class the class derived from the BApplication class. Here you see that the HelloWorld.h...
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Tài liệu Programming the Be Operating System-Chapter 3: BeOS API Overview doc

Tài liệu Programming the Be Operating System-Chapter 3: BeOS API Overview doc

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... toanother window.Class Descriptions and the Be Book The definitive source of information for the many classes that make up the BeOSsoftware kits is the Be class reference by the programmers of the ... to them, some oftheir classes appear throughout the book. See the description of the Support Kitbelow for a specific example concerning the BLocker class.Application Kit The classes of the ... created in the application constructor, the MyHelloWindow constructor is responsible for creating a new view, adding the view to the new window, and then displaying the new window. The new MyHelloWorld...
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Tài liệu Programming the Be Operating System-Chapter 4: Windows, Views, and Messages doc

Tài liệu Programming the Be Operating System-Chapter 4: Windows, Views, and Messages doc

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... was clicked. The values of the point are in the view’s coor-dinate system. For example, if the cursor was over the very top left corner of the view at the time of the mouse click, the point’s ... If the point (100.1, 49.9) is used instead, the result is the same the win-dow’s corner ends up 100 pixels from the left and 50 pixels from the top of the screen. The above scenario begs the ... the window (to the top view), rather thanto another view, so both views are on the same level in the window’s view hierar-chy. The Draw() function of each view type includes code to frame the...
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Tài liệu Programming the Be Operating System-Chapter 5: Drawing ppt

Tài liệu Programming the Be Operating System-Chapter 5: Drawing ppt

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... done in the Draw() function, wherea call to MovePenTo() ensures that the drawing will start in the top left corner of the view (and, because the view is the same size as the window, the top ... FillRegion(fThreeRectRegion);}Implementing the MouseDown() routine for the MyDrawView class is as easy ascomparing the cursor location (supplied by the system when it automaticallyinvokes MouseDown()) to the area of the region. The ... defines one of the fouredges of a rectangle. The values of the left and right members are relative to the left edge of the view that is to hold the rectangle, while the values of the topand bottom...
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The Duality of Memory and Communication in the Implementation of a Multiprocessor Operating System

The Duality of Memory and Communication in the Implementation of a Multiprocessor Operating System

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... architectures.Today, the concept of an extensible operating system is once again gaining acceptance this time as the solutionto the unconstrained growth of UNIX. During the last 20 years operating systems and their ... tasks.Many other operating systems have met with this problem. Often these systems solve the problem by using insideknowledge of the algorithms used to manage secondary storage. Unfortunately, the Mach ... of the 8th Symposium on Operating System Principles, pages 64-75. December, 1981.[16] Rashid, R.F.From RIG to Accent to Mach: The Evolution of a Network Operating System. In Proceedings of the...
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The UNIX Time Sharing System

The UNIX Time Sharing System

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... command:ls >therecreates a file called there and places the listing there. Thus the argument >there means ‘‘place output onthere.’’ On the other hand:edordinarily enters the editor, which ... into a system table (the i-list) stored in a knownpart of the device on which the directory resides. The entry found thereby (the file’s i-node) contains the description of the file:i the user ... However, the structure of files is controlled by the programs that use them, not by the system. 3.2 DirectoriesDirectories provide the mapping between the names of files and the files themselves,...
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The Technique of Film and Video Editing  5th Edition

The Technique of Film and Video Editing 5th Edition

Chụp ảnh - Quay phim

... fight-ing—one is dark and the other is light gray. Their fight foreshadows the larger battles thatloom between the Yankees (the Blues) and the Confederates (the Grays). The shot is simple,but ... mindful of their own safety and the safety of others, including parties for whom they have a professionalresponsibility.To the fullest extent of the law, neither the Publisher nor the authors, ... length of the shots relative to one another. Regardless of theircontent, shortening the shots abbreviates the time the audience has to absorb the informa-tion in each shot. This increases the tension...
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The Unix system interface

The Unix system interface

Kỹ thuật lập trình

... 138Chapter 8 - The UNIX System Interface The UNIX operating system provides its services through a set of system calls, which are ineffect functions within the operating system that may be ... is uniform across operating systems. On any particular system the routines of the standard library have to be written interms of the facilities provided by the host system. In the next few sections ... we will describe the UNIX system calls for input and output, and show how parts of the standard library can beimplemented with them. 8.1 File DescriptorsIn the UNIX operating system, all input...
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