learn operating system programming pdf

... 9.1: Identify Operating System Requirements In this activity, you will first identify the optimal operating system to use in a given situation. Next, you will analyze the operating system selection ... Objectives After completing this activity, you will be able to: ! Identify the appropriate operating system for a given set of requirements and constraints. Before You Begin This activity ... complete this activity: 15 minutes followed by a 10 minute discussion. Activity 9.1: Identify Operating System Requirements 63 Exercise 2: Analyzing Technology Selection (5 minutes) ! Analyze...

Ngày tải lên: 21/12/2013, 06:16

... dealt mostly with system messages—messages generated and dispatched by the system. The Message Protocols appendix of the Be Book defines all the system messages. In short, system messages fall ... BClipboard object that is used to access the systemwide clipboard. 330 Chapter 9: Messages and Threads BClipboard class The previous section described the system s application roster, the be_roster ... carry out the message’s action. That leads to the distinc- tion that a system message is usually handled by a hook function (some system- generated messages, such as the standard messages resulting...

Ngày tải lên: 17/10/2013, 19:15

... Files POSIX,orPortable Operating System Interface for Unix, is a standard developed so that buyers (particularly the U.S. government) could be assured of purchasing programs that ran on a variety of systems ... Using Standard Open and Save Panels 361 Using Standard Open and Save Panels An operating system with a graphical user interface typically provides standard- ized means for opening ... strict stan- dard so that it is easily ported. It’s also designed to run on any POSIX-compliant operating system, which includes most variants of Unix. File Organization The BeOS, like the Mac OS,...

Ngày tải lên: 20/10/2013, 10:15

... multithreaded operating system and a very efficient one. While programmers can explicitly create threads, much of the work of handling threads is taken care of behind the scenes by the operating system ... upgrade its operating system, it must take into account the millions of users that have a large invest- ment in software designed to run on the existing version of its operating system. So no ... with the system s ability to assign threads to processors based on the current load on each processor, makes for a system with very high performance. Preemptive Multitasking An operating system...

Ngày tải lên: 26/01/2014, 07:20

... of the BView member function AttachedToView(). This function is automatically called by the operating system when the view is attached to a window (covered ahead in the discussion of the Setting ... applications. This programming environ- ment consists of a number of folders and files, the most important of which are mentioned in this chapter. In the early stages of your Be programming studies, ... with me just the same. The point here isn’t to see if the HelloWorld project follows the described system of organizing files, it’s to examine an existing project to clarify the class/file relationship. Back...

Ngày tải lên: 26/01/2014, 07:20

... By implementing a hook function, your application in essence extends the functional- ity of the Be operating system. The system is responsible for calling a hook func- tion, while your application is responsible ... present in a class description. 78 Chapter 3: BeOS API Overview Storage Kit All operating systems provide file system capabilities—without them, data couldn’t be saved to disk. The Storage Kit ... the system is aware of. You saw an example of a hook function in the SimpleApp example back in Chapter 1—the QuitRequested() function. When a window’s close button is clicked on, the Be system...

Ngày tải lên: 26/01/2014, 07:20

... constructor. Coordinate System In order to specify where a window is to be placed on the screen and where a view is to be placed within a window, a coordinate system is required. Global coordinate system To ... public: MathApp(); Views 123 coordinate system one that’s independent of the global screen coordinate sys- tem. The type of system is the same as the global system (floating point values that get ... “hooking” your own code onto the system code. Messaging 129 Interface messages A system message directed at the application object is an application message, while a system message directed at a...

Ngày tải lên: 26/01/2014, 07:20

... three color components), and because it is a color system with which many program- mers and end users are familiar with (it’s common to several operating systems). The BeOS defines rgb_color as a struct ... StrokeRect(rect8); SetPenSize(12.0); StrokeRect(rect12); Shapes Be claims that the BeOS is an operating system for the graphics community. So it’s hoped that the BeOS makes it easy for programmers ... user clicks the mouse in the MyDrawView view, MouseDown() makes the system aware of the fact that the view needs updating, and the system invokes Draw(): void MyDrawView::MouseDown(BPoint point) { ...

Ngày tải lên: 26/01/2014, 07:20

... the affected view invoking the BView hook function MouseDown(). Besides being the recipient of system messages, a window is also capable of receiving application-defined messages. This lets you ... window. When the user operates the control (typically by clicking on it, as for a button), the system passes the applica- tion-defined message to the window. How the window handles the message ... BWindow::MessageReceived(BMessage* message) { switch(message->what) { // handle B_KEY_DOWN and scripting-related system messages Figure 6-3. Message passed to parent class’s version of MessageReceived() message Application server MessageReceived() BWindow-derived version MessageReceived() BWindow version MessageReceived() BHandler version message message ...

Ngày tải lên: 26/01/2014, 07:20

... the Audio menu. Like a menu item trigger, the system automatically assigns a trigger to a menu. Again like a menu item, your project can override the system- supplied trigger character. To do that, ... projects use a MyHelloWindow class data member named fNumBeeps to keep track of how many times the system beep should sound in response to a click on the Beep button. The FindItemByMark project omits ... Menus With the exception of a menu item that’s been given a trigger via a call to SetTrigger(), the system doesn’t assign menu items trig- gers until runtime. That’s done to avoid duplication of triggers...

Ngày tải lên: 26/01/2014, 07:20

Ngày tải lên: 26/01/2014, 07:20

Ngày tải lên: 23/03/2014, 16:20

Ngày tải lên: 28/06/2014, 02:20

Ngày tải lên: 28/06/2014, 02:20

Ngày tải lên: 28/06/2014, 02:20

Ngày tải lên: 28/06/2014, 02:20

Ngày tải lên: 28/06/2014, 02:20

Ngày tải lên: 23/07/2014, 23:20

Ngày tải lên: 29/07/2014, 08:20

... University Pittsburgh, PA 15213 Appeared in Proceedings of the 11th Operating Systems Principles, November, 1987 Abstract Mach is a multiprocessor operating system being implemented at Carnegie-Mellon University. ... Collins and L.W. Loen. System/ 38 Machine Storage Management. IBM System/ 38 Technical Developments, IBM General Systems Division :63-66, 1978. [7] Gupta, A. Parallel Production Systems. PhD thesis, ... November, 1984. [9] Kahn, K.C. et al. iMAX: A Multiprocessor Operating System for an Object-Based Computer. In Proc. 8th Symposium on Operating Systems Principles, pages 127-136. ACM, December, 1981. [10]...

Ngày tải lên: 12/09/2012, 15:05