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internal sealed class AnotherHybridLock : IDisposable { // The Int32 is used by the primitive user-mode constructs (Interlocked methods) private Int32 m_waiters = 0; // The AutoResetEvent is the primitive kernel-mode construct private AutoResetEvent m_waiterLock = new AutoResetEvent(false); // This field controls spinning in an effort to improve performance private Int32 m_spincount = 4000; // Arbitrarily chosen count // These fields indicate which thread owns the lock and how many times it owns it private Int32 m_owningThreadId = 0, m_recursion = 0; public void Enter() { // If calling thread already owns the lock, increment recursion count and return Int32 threadId = Thread.CurrentThread.ManagedThreadId; if (threadId == m_owningThreadId) { m_recursion++; return; } // The calling thread doesn't own the lock, try to get it SpinWait spinwait = new SpinWait(); for (Int32 spinCount = 0; spinCount < m_spincount; spinCount++) { // If the lock was free, this thread got it; set some state and return if (Interlocked.CompareExchange(ref m_waiters, 1, 0) == 0) goto GotLock; // Black magic: give other threads a chance to run // in hopes that the lock will be released spinwait.SpinOnce(); } // Spinning is over and the lock was still not obtained, try one more time if (Interlocked.Increment(ref m_waiters) > 1) { // Other threads are blocked and this thread must block too m_waiterLock.WaitOne(); // Wait for the lock; performance hit // When this thread wakes, it owns the lock; set some state and return } GotLock: // When a thread gets the lock, we record its ID and // indicate that the thread owns the lock once m_owningThreadId = threadId; m_recursion = 1; } public void Leave() { // If the calling thread doesn't own the lock, there is a bug

itemDetail = CType(Fines.Items(e.Index), PatronDetailItem) titleText = itemDetail.TitleText fineText = Format(itemDetail.FineAmount, "Currency") paidText = Format(itemDetail.PaidAmount, "Currency") balanceText = Format(itemDetail.BalanceDue, "Currency") If (itemDetail.BalanceDue = 0@) Then useNotice = useBrush

Initialization methods with arguments allow you to create nonstandard objects set up in ways that you choose. They re quite common in the UIKit. One initialization method with an argument deserves a bit of extra mention. initWithCoder: is a special initialization method that s called whenever you create an object with Interface Builder and thus is important if you want to do setup for such objects. We ll return to Interface Builder in chapter 12.

A postconnect action setting that runs a network policy requirements script That network policy requirements script

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The URL in the form tag is hard-coded. If we change the URL structure, this will break. There s no model. We dealt purely with primitive values. Using ViewData["foo"] utilizes magic strings and relies on casting to do anything meaningful with the data. The URL still says Sign even though we rendered the ThankYou view. This is because we didn t redirect to a success page; we simply rendered one. This causes the next unfortunate aspect of the site If you refresh this page, it will prompt you to submit the data again. If the user obliges, two records will be posted with the same data.

Similar to the sub-grid control, you can configure the number of columns a web resource control spans. The number of columns will be limited to the number of columns specified as the layout of the tab, header, or footer in which you are adding the web resource. You can also specify the number of rows the web resource will span, just as with the sub-grid control.

= new PdfLayer("Radiogroup: layer 1", writer); radio1.setOn(true); PdfLayer radio2 = new PdfLayer("Radiogroup: layer 2", writer); radio2.setOn(false); PdfLayer radio3 = new PdfLayer("Radiogroup: layer 3", writer); radio3.setOn(false); radiogroup.addChild(radio1); Adds children radiogroup.addChild(radio2); to parent radiogroup.addChild(radio3); ArrayList<PdfLayer> options Groups = new ArrayList<PdfLayer>(); children in options.add(radio1); ArrayList options.add(radio2); options.add(radio3); writer.addOCGRadioGroup(options); cb.beginLayer(radio1); ColumnText.showTextAligned(cb, Element.ALIGN_LEFT, new Phrase("option 1"), 50, 600, 0); cb.endLayer(); cb.beginLayer(radio2); ColumnText.showTextAligned(cb, Element.ALIGN_LEFT, new Phrase("option 2"), 50, 575, 0); cb.endLayer(); cb.beginLayer(radio3); ColumnText.showTextAligned(cb, Element.ALIGN_LEFT, new Phrase("option 3"), 50, 550, 0); cb.endLayer();

if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

The Roads2 CTE creates the digraph out of Roads. The RoadPaths CTE returns all possible source/target pairs (this has a big performance penalty), and it avoids returning and pursuing a path for which a cycle is detected. The outer query returns all distinct source/target pairs:

public static void Main() { // Both of these lines display "0" Console.WriteLine(Add()); // passes new Int32[0] to Add Console.WriteLine(Add(null)); // passes null to Add: more efficient (no array allocated) }

graphical context (continued) stack 245 transformations and 253 graphical state maintaining in stack 251 managing 257 methods 256 selecting colors in 252 setting in Quartz 251 257 gravity checking 191 194 data, vs. movement data 194 measuring relationship to 191

Figure 11-2. A COMPUTE command syntax diagram Table 11-5 lists the various functions supported by the SQL*Plus COMPUTE command. The expr indicates on which column you want the function to be applied. The break spec indicates at which points in the report you want this computation to happen. The break spec must be a column, column expression, or a report element (ROW or REPORT) on which you previously defined a BREAK. Listing 11-33 shows an example of using COMPUTE.

Example A-14. Our solution to Exercise 7-1

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