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When multiple objects are involved, arbitrarily choosing one of those objects to act as the lock target is likely to make your code harder to follow, because it may not be clear to someone reading your code that you re using that object s lock to protect multiple objects rather than just the one whose lock you re acquiring If you create a special object whose only purpose is locking, this makes it clear to anyone reading your code that she needs to think about what state that lock protects The other reason to avoid acquiring a lock on the object you want to synchronize access to is that you can t always be sure that the object doesn t acquire a lock on itself some developers write lock(this) inside instance methods when trying to make thread-safe objects (for whatever definition of thread-safe they have chosen). asp.net ean 128 EAN - 128 ASP . NET Control - EAN - 128 barcode generator with free ...
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ASP . NET GS1 128 Generator WebForm Control to generate GS1 EAN-128 in ASP.NET projects. Download Free Trial Package | Include developer guide ... It is a bad practice to acquire a lock on your this reference, of course, because you can t necessarily know whether someone using your object will decide to try to acquire a lock on it for his own purposes internal locking is an implementation detail, but your this reference is public, and you don t usually want implementation details to be public So in short, you shouldn t try to acquire a lock on any object you are trying to synchronize access to Bearing all that in mind, what should we do if we want to try to make our MostRecentlyUsed class more robust in multithreaded environments First, we need to decide what multithreading scenarios we want to support Simply declaring that we want the type to be thread-safe is meaningless.. asp.net ean 128 Packages matching Tags:"Code128" - NuGet Gallery
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Barcode Rendering Framework Release.3.1.10729 components for Asp . Net , from http://barcoderender.codeplex.com/ The bar- code rendering framework quite ... So let s say that we want to allow multiple threads to call UseItem and GetItems simultaneously without causing exceptions. That s a pretty weak guarantee notice we ve said nothing about what state the object will be in afterward, merely that it won t actually blow up. Surely it would be better to guarantee to handle the calls in the order in which they were made. Unfortunately, we can t do this if the locking logic lives entirely inside the class. The OS scheduler might decide to preempt a thread moments after it called UseItem, and before it has had a chance to get to any of our synchronization code. For example, consider what could happen if Thread A calls UseItem, and then before that call returns, Thread B also calls UseItem, and before either returns, Thread C calls GetItems. It s fairly easy to think of at least five reasonable outcomes. GetItems might return neither of the items passed in by A and B. It might return both, and there are two ways it could do this GetItems returns an ordered list and either A or B might come first. Or it could return just one either the one passed by A or just the one passed by B. If you need coordination across multiple calls like this it s not going to be possible to do that inside MostRecentlyUsed, because you only have the opportunity to start synchronization work once calls are already underway. This is another reason why synchronization code usually belongs at the application level and not in the individual objects. So about the best we can hope to achieve within this class is to prevent the exceptions from occurring when it s used from multiple threads. Example 16-13 does this. class MostRecentlyUsed { private List<string> items = new List<string>(); private int maxItems; private object lockObject = new object(); public MostRecentlyUsed(int maximumItemCount) { maxItems = maximumItemCount; } public void UseItem(string item) { lock (lockObject) { // If the item was already in the list, and isn't the first item, // remove it from its current position, since we're about to make // it this first item. int itemIndex = items.IndexOf(item); if (itemIndex > 0) { items.RemoveAt(itemIndex); } // If the item's already the first, we don't need to do anything. Figure 19-4. The rescue environment shell prompt After you mount your Linux system s partitions, you must remember that the root (/) partition you re in is only the temporary root partition of the rescue environment. This isn t the same as the root partition during normal mode. The rescue environment contains two virtual consoles. The first console appears one after the environment loads. You can start using this console to run shell commands to troubleshoot your system. If you need to do something else like examine a configuration file while a command is running on the first console, you can use the second console to view it. You can access the second virtual console by pressing Ctrl+Alt+F2 and it gives you a prompt to run commands. To go back to the first virtual console, use Ctrl+Alt+F1. asp.net ean 128 Where can I find a font to generate EAN 128 bar-codes? - Stack ...
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