define operating system software explaining the function and providing examples

... view object then invokes the BView member function KeyDown() or MouseDown() to handle the message. Types of hook functions For some system messages, the hook function defined by the Be class ... 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 ... are in the array that is the first parameter. As with all hook functions, the values of these parameters are filled in by the system and are available in your implementation of the hook function should...

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... queue. 5.5. Fault Handling The Mach page fault handler is the hub of the Mach virtual memory system. The kernel fault handler is called when the hardware tries to reference a page for which there no valid ... architectures. Today, the concept of an extensible operating system is once again gaining acceptance this time as the solution to the unconstrained growth of UNIX. During the last 20 years operating systems and their ... which there is a protection violation. The fault handler has several responsibilities: ã validity and protection - The kernel determines whether the faulting thread has the desired access to the address,...

Ngày tải lên: 12/09/2012, 15:05

... becomes the next in the queue, the looper invokes DispatchMessage() to pass the message to the target handler. The effect is for the posted message to reach the target handler’s MessageReceived() function. ... matches the message’s what data member, the handler acts on the message. Since the above code names a window as both the looper and the target handler, the window must have a MessageReceived() function ... target handler object is going to reply to the message (more typically the target handler simply handles the message and doesn’t return any type of reply). While the poster of the message and the...

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... sequen- tially, then writes 100 Mbytes randomly to the existing file, then reads 100 Mbytes randomly from the file, and finally reads the file sequentially again. The bandwidth of each of the five phases ... whose file system is based on Unix FFS. The benchmarks are synthetic so they do not represent realistic workloads, but they illustrate the strengths and weaknesses of the two file systems. The machine ... reading the files back; this is because the files are read in the same order created and the log- structured file system packs the files densely in the log. Furthermore, Sprite LFS only kept the disk...

Ngày tải lên: 12/09/2012, 15:05

... because they are people who directly implement, maintain and improve the system. The company should organize training-courses to raise the awareness of officials and workers about the effects of the implemented ... management systems. When managers use a process approach, it means that they manage the processes that make up their organization, the interaction between these processes, and the inputs and outputs ... 0918.775.368 ã Providing adequate resources for the operation of the quality management system ã Reviewing the operation of the quality management system 2.2.1 Establishing the quality policies...

Ngày tải lên: 18/04/2013, 17:09

... the upcoming file saving and opening changes. While looking over the old code, I’ll insert a few changes here and there to ready the program for the file-handling code. The changes begin in the ... read the file’s data. The BFile function Read() handles that chore. The data is text, so it’s saved to the character pointer text. Invoking the BTextView function SetText() sets the text of the ... file panel, the display of the panel comes when the user chooses the Save As item from the File menu. In response to the message issued by the system to the appropriate MessageReceived() function, ...

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Ngày tải lên: 25/11/2013, 11:07

... service. At the end of this module, you will be able to identify the features of the Windows 2000 operating systems and describe the different types of networks and network operating systems. ... 2YHUYLHZ# „ :LQGRZV#5333#2SHUDWLQJ#6\VWHPV „ ,QWURGXFWLRQ#WR#1HWZRUNV „ :LQGRZV#5333#,PSOHPHQWDWLRQ#RI#1HWZRUNLQJ The fundamental core of a computer is its operating system: the software that controls its hardware. As its name suggests, the operating system operates the computer. It loads ... devices. The operating system enables applications to create and open files, transfer data between devices, and perform such file- management tasks as renaming and deleting. The operating system...

Ngày tải lên: 09/12/2013, 17:15

... Close the files close(infd); close(outfd); Figure 6-36. A program fragment for copying a file using the UNIX system calls. This fragment is in C because Java hides the low-level system calls and ... create the producer c = new consumer( ); // create the consumer p.start( ); // start the producer c.start( ); // start the consumer } // This is a utility function for circularly incrementing in and ... hardware) Context Valid Physical page Virtual page tag Flags (b) (c) Format is entirely defined by the operating system Translation table (Operating system) TSB (MMU + sofware) Context Entry 0 is shared by all virtual...

Ngày tải lên: 12/12/2013, 09:15

... change. 6 To remove the “Zoom” view from a line, select the line with the “zoomed” view and then select the Zoom function again (see steps 2, 3, and 4). Sort The Sort function on the Datastream ... do the following: a Select the vehicle manufacturer and press the ENTER key.This displays the selected vehicle descrip- tion in the top part of the screen and changes the middle part of the ... Off. Item 3 Show the test status Item 4 Use the function keys to control the actuator as necessary. Compare what is commanded by the NGIS tool (Command) to the state of the signal at the solenoid...

Ngày tải lên: 12/12/2013, 21:16

... to build them individually: makeworld can pose a chicken -and- egg problem. It creates the userland, and makekernel makes the kernel. Userland and kernel belong together ,and if you upgrade the userland ... depending on the speed of the machine, it may keep the computer busy for several hours. In general, you build and install the userland first, then you build and install the kernel. The traditional ... the libraries. ã It builds the rest of the system, with the exception of the kernel and the boot tools. ã It installs everything. You can omit this stage by building the buildworld target instead...

Ngày tải lên: 21/12/2013, 11:15

... out the basic operating functions Ex: Operating systems, utilities, and drivers ATHENA Chapter 2: Software & Operating System ATHENA Objective ~ What is the software? ~ How is software categorized? ... UNIX ~ The operating system also interacts with the next functional layer called application software. ATHENA What does an operating system do? Example: ATHENA Personal Computer Operating Systems ~ ... is software categorized? ~ operating system Overview ~ What does an operating system do? ATHENA How is software categorized? ~ Software is categorized as either application software or system...

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