GARBAGE COLLECTION in C#.net

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increasingly important to be able to filter information and to make it available to us when we want to consume, or discard, it. As the screenshots have revealed, I can have thousands of unread items at any given time. I usually catch up once or twice a month when I have the time for it. When I glance through news items, I may read some right away and save some for later, but I often don t know which I ll save until I view the individual items. Even what currently seems to be the most polished and popular Google Reader application on the App Store doesn t support all these use cases. If you tap an item, for example, it gets marked as read, and there s no way to mark it back to unread; therefore, you lose track of the item and can t easily find it again if you ve chosen not to have read items displayed in the application. With so much information available, I bet many users have chosen this option. You can star an item and review it later, yes, but you may want to use the star in a different way. When we software developers put these kinds of constraints on our users, we may limit them severely in their productivity. Google Reader lets you toggle the read status, but it requires you to scroll all the way to the bottom of the article, which can often be quite a travel especially if you want to read it later because it s a lengthy article. Another and possibly even more important issue, to which I haven t seen a solution anywhere, is the ability to prioritize your feeds and the items therein. I can make no distinction in the applications between what I must read and what can wait. As you saw in Figure 2-6, I subscribe to various related feeds that I ve grouped in the iPhone folder (only feeds with unread items are shown). But some of these are more important to me than others. Instead of grouping my feeds they way I have, I could group them by importance, but I would lose the current grouping and have unrelated feeds mixed together, which is not what I want. That would be like having a newspaper with sports and politics mixed together, and who could even imagine such a thing Besides, the importance is also likely to change from time to time, depending on the things I m currently working on or active within. In other words, neither Google Reader nor any other newsreader application I ve used lets me give a hint as to what s important to me and what my reading patterns are, let alone automatically adapting to them. Every feed, every item is treated the same.
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CHAPTER 15 SECURITY
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MULTITARGETING SUPPORT
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Reviewing Compilation Models
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CHAPTER 6 WORKING WITH DATA
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Figure 3-10. The read-only collection objects, ProjectList and ResourceList
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In Listing 4-12, you saw how you could pass a handle by reference using the ^% indirection. In Listing 4-25, you see that a reference type object with stack semantics isn t affected by a function that takes a reference to a handle if you use the tracking reference operator (%) to create a handle to the object. This is because the handle obtained with the % operator is a different, temporary handle. As a result, an object with stack semantics always represents the original object, so you can be assured that the correct object is cleaned up at the end of the block.
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Number identifying the type of target machine. (See Table 4-2.) If the managed PE file is intended for various machine types, this field should be set to IMAGE_FILE_MACHINE_I386 (0x014C). The IL assembler has the command options /ITANIUM and /X64 to specify IMAGE_FILE_MACHINE_IA64 and IMAGE_FILE_MACHINE_AMD64 values, respectively. Number of entries in the section table, which immediately follows the headers. Time and date of file creation. File pointer of the COFF symbol table. As this table is never used in managed PE files, this field must be set to 0. Number of entries in the COFF symbol table. This field must be set to 0 in managed PE files. Size of the PE header. This field is specific to PE files; it is set to 0 in COFF files. Flags indicating the attributes of the file. (See Table 4-3.)
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A useful feature when using the network programming techniques we covered in 21 is to be able to determine whether there is network connectivity available before starting a network operation. We can do this using the NetworkInterface class in the System.Net.NetInformation namespace, as demonstrated by Listing 26-16. Listing 26-16. Obtaining Connectivity Information using System; using System.Net.NetworkInformation; class Listing 16 { static void Main(string[] args) { // check the overall connectivity bool isNetworkAvailable = NetworkInterface.GetIsNetworkAvailable(); // enumerate the status of individual interfaces NetworkInterface[] myInterfaces = NetworkInterface.GetAllNetworkInterfaces(); foreach (NetworkInterface networkInterface in myInterfaces) { if (networkInterface.OperationalStatus == OperationalStatus.Up) { Console.WriteLine("Name: {0}, Type: {1}, Avalable: {2}", networkInterface.Name, networkInterface.NetworkInterfaceType, networkInterface.OperationalStatus); } } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } If you care that there is network connectivity but don t care about which interfaces are operational, then the static GetIsNetworkAvailable method can be of great use. It returns true if there is at least one operational network interface and false if there is not. If you care about specific interfaces being available, then you can obtain an array of NetworkInterface objects by calling the static GetAllNetworkInterfaces method. The array contains one NetworkInterface object for each of the network interfaces on the current machine. The NetworkInteface class contains a number of useful properties that can be used to get information about an interface. The most useful of these is described in Table 26-8.
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The PGA is a process-specific piece of memory. In other words, it is memory specific to a single operating system process or thread. This memory is not accessible by any other process or thread in the system. It is typically allocated via either of the C runtime calls malloc() or memmap(), and it may grow (or even shrink) at runtime. The PGA is never allocated in Oracle"s SGA; it is always allocated locally by the process or thread the P in PGA stands for process or program; it is not shared. The UGA is, in effect, your session"s state. It is memory that your session must always be able to get to. The location of the UGA is wholly dependent on how you connect to Oracle. If you connect via a shared server, the UGA must be stored in a memory structure that every shared server process has access to and that s the SGA. In this way, your session can use any one of the shared servers, since any of them can read and write your session"s data. On the other hand, if you are using a dedicated server connection, there s no need for universal access to your session state, and the UGA becomes virtually synonymous with the PGA; it will, in fact, be contained in the PGA of your dedicated server. When you look at the system statistics, you"ll find the UGA reported in the PGA in dedicated server mode (the PGA will be greater than or equal to the UGA memory used; the PGA memory size will include the UGA size as well). So, the PGA contains process memory and may include the UGA. The other areas of PGA memory are generally used for in-memory sorting, bitmap merging, and hashing. It would be safe to say that, besides the UGA memory, these are the largest contributors by far to the PGA. Starting with Oracle9i Release 1 and above, there are two ways to manage this other non-UGA memory in the PGA: Manual PGA memory management, where you tell Oracle how much memory it can use to sort and hash any time it needs to sort or hash in a specific process. Automatic PGA memory management, where you tell Oracle how much memory it should attempt to use system wide.
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CHAPTER 20 ENUMERATORS AND ITERATORS
Properly designed objects encapsulate both behavior or logic and the data required by that logic.
There are several conventions for naming properties and their backing fields. One convention is to use the same string for both names but use camel casing (in which the first letter is lowercase) for the field and Pascal casing for the property. Although this violates the general rule that it is bad practice to have different identifiers that differ only in casing, it has the advantage of tying the two identifiers together in a meaningful way. Another convention is to use Pascal casing for the property, and then for the field, use the camel case version of the same identifier, with an underscore in front. The following code shows both conventions: private int firstField; public int FirstField { get { return firstField; } set { firstField = value; } } private int _secondField; public int SecondField { get { return _secondField; } set { _secondField = value; } } // Camel casing // Pascal casing
Private Member Accessibility
In Visual C++ 2008, a new library has been introduced that simplifies the code in this chapter. This feature is known as the marshaling library. Before the marshaling library, the traditional approach involved using pinning pointers, which I ll cover later in this chapter. The marshaling library is referenced by including the <msclr\marshal.h> header. The marshal_as template function in the msclr::interop namespace performs the conversions. This template function takes two template parameters, but only one of the template parameters must be explicitly specified, namely, the destination type. The other template parameter is conveniently inferred from the type of the arguments supplied when marshal_as is called. Thus, if you want to marshal from a pointer to const wchar_t to a handle to String, you would write the following: const wchar_t* source; String^ dest = marshal_as<String^>(source); Some conversions require memory to be allocated, which must later be freed. Such conversions require an object called a context that can be deleted when it is no longer needed. Converting from a managed String to a native character pointer requires a context, because a temporary copy of the String is used during the conversion. The code would look like this:
CHAPTER 9 GRAPHICS
CHAPTER 6 LOCKING AND LATCHING
Return a generic enumerator. public IEnumerator<string> BlackAndWhite() { yield return "black"; yield return "gray"; yield return "white"; }
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