chapter 8 guardian a fault tolerant operating system environment

Tài liệu Practical mod_perl-CHAPTER 8:Choosing a Platform for the Best Performance docx

Ngày tải lên : 26/01/2014, 07:20

... treated by the operating system as one single disk, and often forced to appear that way by the hardware The reason for using RAID is often simply to achieve a high data-transfer rate, but it may ... may also be to get adequate disk capacity or high reliability Redundancy means that the system is capable of continued operation even if a disk fails There are various types of RAID arrays and ... lot of read/write operations to disk) you need a very fast disk, especially when using a relational database Don’t spend the money on a fancy video card and monitor! A cheap card and a 14-inch...

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[Khiem] improvement of matrix converter drive reliability by online fault detection and a fault tolerant switching strategy IEEE trans

Ngày tải lên : 13/05/2014, 00:55

... simulation, whereas the postfault modulation algorithm was carried out with a separate experiment B Methods for Fault- Tolerant Operation This paper seeks to address the aforementioned problems A ... abnormal behaviors when the hardware suffers a device failure A detailed study comparing the abnormal behavior (in the presence of fault) against the normal behavior is a common approach to deriving ... second challenge to improving matrix converter system reliability is to develop a postfault solution that maintains system operation as close as possible to normal The solution for fault- tolerant...

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AN1264 integrating microchip libraries with a real time operating system

Ngày tải lên : 11/01/2016, 17:04

... Updates • Gas Unit Updates The start of each message contains either an E or G character to distinguish the type and the remaining data contains the ASCII meter reading values In a real application, ... it may be created via the use of a semaphore, and in the case of FreeRTOS, there is a great deal of similarity between the two At program start-up, a semaphore or binary flag is created, and ... screen • Finally, the RTOS summary screen displays information on the main tasks in the application For each task a bar graph shows the maximum stack size allocated to that task along with the...

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Tài liệu Programming the Be Operating System-Chapter 8: Text ppt

Ngày tải lên : 26/01/2014, 07:20

... and location A call to the BView function SetResizingMode() takes care of that task Scrollbar range If a scrollbar’s target is a view that holds a graphical entity, such as a BView object that ... function MakeSelectable(), pass a value of false as the sole argument: fTextView->MakeSelectable(false); You can enable text selection by again calling MakeSelectable(), this time with an argument ... that appears above provides an example That method initializes all of the objects of a particular class to use the same font In the above example, all MyDrawView objects will initially display...

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Operating System Concepts - Chapter 8: Main Memory doc

Ngày tải lên : 28/06/2014, 02:20

... virtual page number is hashed into a page table This page table contains a chain of elements hashing to the same location Virtual page numbers are compared in this chain searching for a match If a ... various size are scattered throughout memory When a process arrives, it is allocated memory from a hole large enough to accommodate it Operating system maintains information about: a) allocated ... frames and load program Set up a page table to translate logical to physical addresses Internal fragmentation Operating System Concepts – 7th Edition, Feb 22, 2005 8.20 Silberschatz, Galvin and...

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Fundamentals of Global Positioning System Receivers A Software Approach - Chapter 8 pps

Ngày tải lên : 14/08/2014, 10:22

... correlators are ﬁltered and their phases are compared against each other through an arctangent comparator The arctangent operation is insensitive to the phase transition caused by the navigation data ... track 20 ms of data without a navigation data phase transition, one must ﬁnd a phase transition in the data This requirement puts an additional restraint on the acquisition program The acquisition ... tracking ms of data If the data length is longer than 20 ms, it may contain a phase transition due to the navigation data The phase transition will disturb the operation of the tracking program...

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

Ngày tải lên : 12/09/2012, 15:05

... access to cached data than the data manager has permitted (e.g., a write fault on a page made read-only by a pager_data_lock call), the kernel issues a pager_data_unlock call The data manager is ... nature to a data manager which fails to free data, but is easier to detect and prevent • Data manager changes data A malicious data manager may change the value of its data on each cache refresh ... the cached data The kernel uses the pager_data_write call in response, just as when it initiates a cache replacement A data manager may restrict the use of cached data by issuing a pager_data_lock...

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

Ngày tải lên : 17/10/2013, 19:15

... when adding data that is to become the first item in a new array (recall that adding data with the same name parameter automatically results in the data being stored in an array) Both these parameters ... holds the data itself Unlike most Add functions, though, in AddData() the data parameter is a pointer to the data rather than the data itself Because AddData() can accept data of any type, you ... extract any or all of the message’s data from the object that receives the message Data added to a message always has both a name and a type These traits alone are usually enough to extract the...

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Programming the Be Operating System-Chapter 10: Files

Ngày tải lên : 20/10/2013, 10:15

... BFile class that I’ll use in this chapter’s examples Using Standard Open and Save Panels 361 Using Standard Open and Save Panels An operating system with a graphical user interface typically provides ... provide a name for a file Figure 10-1 The standard Save file panel Using BFilePanel to Create a Panel The Storage Kit defines a single BFilePanel class that’s used to create both a Save file panel ... directory and name into a form that can be passed to a file-opening routine Recall that a file consists of an entry (a location) and a node (data) The entry can be represented by an entry_ref or a BEntry...

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Tài liệu A+operating system technologies doc

Ngày tải lên : 11/12/2013, 14:15

... Windows 9x registry? A B C D Flat text file Relational database Hierarchical database Spread sheet template Answer: C The registry is organized as a hierarchical database Flat text files, ini-files, ... switch(syntax:command/switch) should you type after a DOS command to get a list of switches available for the particular command as well as an explanation of what they do? A B C /? /# /* Leading the way ... Plug and play is a standard for hardware peripherals QUESTION NO 36 In the Windows 98 device manager what does a black exclamation point on a yellow field next to a sound card indicate? A B C...

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Tài liệu CompTIA A+ Operating System Technologies docx

Ngày tải lên : 11/12/2013, 15:15

... "soft" page faults Perfmon may be logged over time and used to establish a baseline of normal performance to compare against any abnormal activity Task Manager - provides a quick and handy method ... several other local groups are added as default, such as Server Operator, Account Operator, Print Operator (no Power User), and three global groups Domain Administrators, Domain Users, and Domain ... Performance Monitor - provides a finely controllable EEG-like view (by default) of all aspects of system operation Other views available are histogram (bar graph), report (numeric average), and alert,...

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Tài liệu Chapter 2: Software & Operating System ATHENA doc

Ngày tải lên : 20/01/2014, 22:20

... functional layer called application software ATHENA How is software categorized? ATHENA What does an operating system do? Example: ATHENA Personal Computer Operating Systems Windows, Mac OS, Linux, ... What is the software? How is software categorized? What is an operating system ? What does an operating system do? ATHENA What’s the software ? Software is the instructions and associated data, ... System software is designed to help the computer carry out the basic operating functions Ex: Operating systems, utilities, and drivers ATHENA Operating System Overview: What is an operating system...

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

Ngày tải lên : 26/01/2014, 07:20

... application code and data Typically, a system reserves hard drive space and uses that area as virtual memory As a program executes, the processor shuffles application code and data between RAM and ... on how an application and windows can in fact watch for and respond to messages To summarize, a BLooper object has a thread that runs a message loop that dispatches messages, and a BHandler object ... application a trivial one Messages, Threads, and Application Communication Earlier in this chapter, you read that the BeOS is a multithreaded operating system You also read that the term multithreaded...

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

Ngày tải lên : 26/01/2014, 07:20

... instances of a single copy of a program to execute simultaneously Background App An application can forego a user interface and run in the background only If an application is marked as a background ... created, it doesn’t initially have any views attached to (associated with) it Because drawing always takes place in a view and never directly in a window, any program that draws must define a ... messages) Marking an application as argv only means that the only information the application receives comes from the argc and argv command-line arguments that can be optionally passed to the program’s...

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

Ngày tải lên : 26/01/2014, 07:20

... class serves a somewhat similar purpose; is the basic datatype that serves as the foundation of Be graphics BRect objects are declared in the same way primitive datatype variables are declared—there’s ... windows are initially to be identical An example of such an application might be a graphics program that opens windows that each have the same tool palette along one edge The palette could be a view ... virtual ~BAlert(); BArchivable status_t BAlert(BMessage *data); *Instantiate(BMessage *data); Archive(BMessage *data, bool deep = true) const; void char SetShortcut(int32 button_index, char key);...

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

Ngày tải lên : 26/01/2014, 07:20

... second parameter tells how many bytes 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 application, you can add to the class definition a private data member of the window class type Consider a program that displays two windows: an input window for entering a mathematical equation, ... include two data members As shown below, Be convention uses a lowercase f as the first character of a data member name: class MathApp : public BApplication { public: MathApp(); 108 Chapter 4: Windows,...

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

Ngày tải lên : 26/01/2014, 07:20

... like a basic datatype rather than a class The declaration of a BPoint is all that’s needed to actually create a BPoint object 160 Chapter 5: Drawing Because the BPoint data members are declared ... be a variable of type rgb_color and defines that variable to represent red The snippet also declares a BRect variable named aRect, and sets that variable to represent a rectangle with a width and ... Once initialized, a variable of type pattern is used just as one of the Be-defined pattern constants—pass the variable as an argument to any routine that requires a pattern as a parameter The following...

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Tài liệu Programming the Be Operating System-Chapter 6: Controls and Messages ppt

Ngày tải lên : 26/01/2014, 07:20

... fButton->MakeDefault(true); If the window that holds the new default button already had a default button, the old default button automatically loses its default status and becomes a “normal” button ... with the appropriate what data member value to the affected BWindow object You’ve just seen a snippet that created a BButton associated with a BMessage object That BMessage had a what data member ... intentionally uses the message constant value convention of uppercase-only characters and underscores to make it obvious that a message is a system message You can easily avoid duplicating a Be-defined...

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Tài liệu Programming the Be Operating System-Chapter 7: Menus docx

Ngày tải lên : 26/01/2014, 07:20

... menu A menubar must be created before a menu can be added to it, and a menu must be created before a menu item can be added to it However, the attaching of a menubar to a window and the attaching ... the practice used in each case: message creation and message handling In Chapter 6, you read that to create a control, such as a button, you define a message constant and then use new along with ... message constant) That’s all well and good, but what’s the likelihood of a real-world application having a window that includes both a control and a menu item that produce the same action? Perhaps...

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