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You can see that only one thread at a time can enter the critical section, so in practice, you get the same effect you d get with the Monitor.TryEnter method. However, the Interlocked class permits something that the Monitor class doesn t allow: you can set a threshold (higher than 1) for the number of threads that run inside the critical section. To see what I mean, just replace one line in the preceding code:

After you click OK in the Field dialog box to add a field, Word displays the field results in place of the field. This means that if you ve inserted an AUTHOR field in your document, the name of the author will appear instead of the AUTHOR field code. If you ve used the DATE field code to enter today s date, the date itself will appear instead of the code. To switch between displaying field codes and field values, use one of these methods:

To change the display of a single field, click in the field and press Shift+F9. To change the display of all fields in the document, press Alt+F9.

411 Troubleshoot Connectivity Issues 411 Take a Practice Test 411.

Let up to four threads run in the critical section. If Interlocked.Increment(lockCounter) <= 4 Then

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Tip Change field code display If your field codes are displayed instead of the field values, choose Tools, Options to display the Options dialog box. If the Field Codes check box in the Show section, on the View tab is selected, the values will not be displayed. Clear the Field Codes check box to display val ues instead of codes, and click OK to close the dialog box.

The Interlocked class exposes two additional shared methods. The Exchange method lets you assign a value of your choosing to an Integer, a Single, or an Object variable and return its previous value, as an atomic operation. The CompareExchange method works similarly, but it does the swap only if the memory location is currently equal to a specific value that you provide as an argument.

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Before You Begin 493 Lesson 1: Managing Remote Desktop Connections 495 Understanding Remote Desktop 495 Understanding New Remote Desktop Security Features 495 Configuring Remote Desktop Connection 497 Allowing Remote Desktop Connections 499 Troubleshooting Remote Desktop 501 Practice: Implementing and Troubleshooting Remote Desktop 502 Lesson Summary 509 Lesson Review 509.

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Many resources in the real world can be either read from or written to. Often these resources allow either multiple read operations or a single write operation running in a given moment. For example, multiple clients can read a data file or a database table, but if the file or the table is being written to, no other read or write operation can occur on that resource. You can create a lock that implements single-writer, multiple-reader semantics by using a ReaderWriterLock object. Using this object is straightforward. All the threads intending to use the resource should share the same instance of the ReaderWriterLock class. Before attempting an operation on the resource, a thread should call either the AcquireReaderLock or the AcquireWrit erLock method, depending on the operation to be performed. These methods block the current thread until the lock of the requested type can be acquired. (For example, until no other thread is holding the lock if you requested a writer lock.) Finally, the thread should call the ReleaseReaderLock or ReleaseWriterLock method when the read or write operation on the resource has been completed. The following code example creates 10 threads that perform either a read or a write operation on a shared resource (relevant statements are in boldface):

Once you ve added a field to your document, you might want to make changes. To do this, simply right-click the field and click Edit Field on the shortcut menu, as shown in Figure 31-6. The Field dialog box appears, and you can make field changes as needed.

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