critical section problem in operating system ppt

... functionalities of an operating system s kernel into totally separate inter-communicating programs. This makes it very modular, which makes testing, detecting and correcting bugs, maintenance etc., ... file system hierarchy Any operating system needs to save numerous files: from system configuration files, to log files or user files etc. In general, each operating system uses its own file system ... to build an operating sys- tem similar to UNIX following the POSIX norms (Portable Operating System Interface). Although UNIX also had its own problems and faults, it was, and continues to be,...

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... 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 ... shadowing, the data is instead copied from the original. 1 1. Introduction In late 1984, we began implementation of an operating system called Mach. Our goals for Mach were: ã an object oriented interface ... Principles of Distributed Computing. 1986. [15] Rashid, R.F. and Robertson, G. Accent: A Communication Oriented Network Operating System Kernel. In Proceedings of the 8th Symposium on Operating...

Ngày tải lên: 12/09/2012, 15:05

... operating system software is integrated into a number of popular operating systems, including Microsoft Windows 2000, Windows NT, Windows 98, Windows 95, and Apple Macintosh. Information in ... network operating system. Just as a computer cannot operate without an operating system, a network of computers cannot operate without a network operating system. Every network operating system ... Depending upon the network operating system s manufacturer, a desktop computer’s networking software can be added either to the computer’s own operating system or be integrated with it. Network operating...

Ngày tải lên: 09/12/2013, 17:15

... c2950-c3h2s-mz.120-5.3.WC.1.bin Destination filename [c2950-c3h2s-mz.120-5.3.WC.1.bin]? [enter] 3 - 6 CCNA 3: Switching Basics and Intermediate Routing v 3.0 - Lab 6.2.7a Copyright  2003, Cisco Systems, Inc. ... [U] System XMODEM upgrade [D] Download test subsystem (XMODEM) [T] System TFTP upgrade [X] Exit to Main Menu Enter Selection: 4 - 6 CCNA 3: Switching Basics and Intermediate Routing ... used in this classroom. Please check with the instructor for the operating instructions for the TFTP server used in place of the Cisco TFTP server. b. Once the TFTP server is running and...

Ngày tải lên: 24/01/2014, 19:20

... that the work of maintaining a win- dow’s thread and of keeping a window informed of system messages (such as a mouse button click in the window) is taken care of by the operating system. You’ll be ... implementing multitasking is for an operating system to employ preemptive multitasking. In a preemptive multitasking environ- ment the operating system can, and does, preempt currently running applications. With ... For instance, when a window is created in a program, the BeOS creates and maintains a sepa- rate thread for that one window. Multiprocessor Support An operating system that uses multithreading,...

Ngày tải lên: 26/01/2014, 07:20

... Lines Drawing a line or lines is drawing at its most basic level. Points are used in speci- fying where a line should be drawn within a view. The BPoint class A point is represented by a BPoint ... 50.0); SetHighColor(redColor); SetPenSize(10.0); StrokeLine(start1, end1, stripePattern); PointAndLine example project The PointAndLine project is a simple exercise in moving the pen and drawing lines. The resulting program draws the two lines ... represent lines. Instead, line drawing takes place using the BView member function StrokeLine(). When invoking this function, you can use a pair of BPoint objects to specify the start and end points...

Ngày tải lên: 26/01/2014, 07:20

... click- ing on the Beep One button produces a single system beep. Clicking on the checkbox disables beeping by disabling the button. The bottom window in Figure 6-7 shows how the program’s one window ... *fRadioBeep3; int32 fNumBeeps; MyRadioView *fMyRadioView; }; 178 Chapter 6: Controls and Messages results in that window invoking the BWindow hook function Zoom() to shrink or enlarge the window. ... message results in 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....

Ngày tải lên: 26/01/2014, 07:20

... Text Manipulating the Text in a String Once a string view object is created, its text can be altered using a variety of BStringView member functions. Setting the text in a string The text of a BStringView ... continues on the following line. Text can instead be forced to remain on a single line until a newline character (a hard return established by a press of the Return key) designates that a new line ... fTextView->SetStylable(true); } Scrolling Text or graphics your application uses may not always fit within the confines of a view. Enter the scrollbar. The APIs for other operating systems that employ a graphical user interface include...

Ngày tải lên: 26/01/2014, 07:20

... remaining 32-bit assumptions inherited from mips.md, and arranged to store long ints in register pairs, and call helper routines for mul, div, rem, and some shifts. My port was up and running in ... do. List- ing 1 is the source for a binary tree search routine, and Listing 2 is the assembly code lcc-xr16 emits. INSTRUCTION SET Now, let’s refine the instruction set and choose an instruction ... instruction encod- ing. My goals and constraints include: cover C (integer) operator set, fixed- size 16-bit instructions, easily de- coded, easily pipelined, with three- operand instructions (dest...

Ngày tải lên: 26/01/2014, 14:20

... compression technology shrinks files so they take up less disk space. ã Using a compression utility, you can shrink multiple files into a single archive file. ã Utilities such as Windows' DriveSpace ... measured. ã Identify two drive interface standards. This lesson includes the following sections: ã Average Access Time ã File Compression ã Data-Transfer Rate ã Drive-Interface Standards ... le s s o n 10 Re vie w ã Define average access time and explain how it is measured. ã Explain why file compression is a factor in drive performance. ã Define data transfer rate and describe...

Ngày tải lên: 16/02/2014, 08:20

... reacting to the real probability of not getting a job after completing their education training. With the diminishing intake of new recruits into tertiary institution, lack of faith and interest ... about using condoms, faithfulness and abstaining but should increasingly address the issues of serial monogamy, HIV testing before engaging in unprotected sex, and having sexual partners within ... are enormous. In the education system, it translates, among other things, into shortages in education supply and increased costs of recruitment, training and development, and mentoring. Furthermore,...

Ngày tải lên: 19/02/2014, 00:20

... work- load. dialogue- induced possible driving- induced driving- induced low workload Page 1 Figure 7: Workload while driver is resuming to the interview domain. dialogue- induced possible driving- induced driving- induced low ... respectively. dialogue- induced possibly driving- induced driving- induced low workload Page 1 Figure 5: Workload while the driver is interrupting an interview topic. dialogue- induced possibly driving- induced driving- induced low ... driver to interrupt dur- ing dialogue- or driving-induced workload, while the passenger rarely interrupts during dialogue- induced and never during driving-induced work- load. dialogue- induced possible...

Ngày tải lên: 20/02/2014, 04:20