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Although active threads can be moved between AppDomain boundaries, a given thread can execute within only a single application domain at any point in time (in other words, it is impossible for a single thread to be doing work in more than one AppDomain). When you wish to programmatically gain access to the AppDomain that is hosting the current thread, call the shared Thread.GetDomain() method: Private Sub ExtractAppDomainHostingThread() ' Obtain the AppDomain hosting the current thread. Dim ad As AppDomain = Thread.GetDomain() End Sub A single thread may also be moved into a particular context at any given time, and it may be relocated within a new context at the whim of the CLR. When you wish to obtain the current context a thread happens to be executing in, make use of the shared Thread.CurrentContext property: Private Sub ExtractCurrentThreadContext() ' Obtain the Context under which the ' current thread is operating Dim ctx As Context = Thread.CurrentContext End Sub Again, the CLR is the entity that is in charge of moving threads into (and out of) application domains and contexts. As a .NET developer, you can usually remain blissfully unaware where a given thread ends up (or exactly when it is placed into its new boundary). Nevertheless, you should be aware of the various ways of obtaining the underlying primitives.

One of the many joys (read: painful aspects) of multithreaded programming is that you have little control over how the underlying operating system or the CLR makes use of its threads For example, if you craft a block of code that creates a new thread of execution, you cannot guarantee that the thread executes immediately Rather, such code only instructs the OS to execute the thread as soon as possible (which is typically when the thread scheduler gets around to it) Furthermore, given that threads can be moved between application and contextual boundaries as required by the CLR, you must be mindful of which aspects of your application are thread-volatile (eg, subject to multithreaded access) and which operations are atomic (thread-volatile operations are the dangerous ones!) To illustrate, assume a thread is executing a method of a specific object.

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If you do need the modal view to utilize the entire screen, you can set the modalPresentationStyle property to UIModalPresentationFullScreen. But what do you do when the rare need arises to display a modal view within a popover or one of the split view panes That s where UIModalPresentationCurrentContext comes to the rescue, presenting the modal view in the same size as the parent view that called it. For example, a UIModalPresentationCurrentContext-assigned modal view shown within a popover would use the same width and height dimensions as the popover. Even though tapping outside a popover will automatically dismiss it, that won t work with modal views. Just like its counterpart on the iPhone, a modal view needs to be programmatically closed on the iPad. This can be achieved by including a Done button (as shown in Figures 3-9 and 3-10) or by designating this task to some other user interaction within the modal view. In 8, you will learn how to put these new modal view styles to good use in your own iPad apps.

Now assume that this thread is instructed by the thread scheduler to suspend its activity, in order to allow another thread to access the same method of the same object If the original thread was not completely finished with the current operation, the second incoming thread may be viewing an object in a partially modified state At this point, the second thread is basically reading bogus data, which is sure to give way to extremely odd (and very hard to find) bugs, which are even harder to replicate and debug Atomic operations, on the other hand, are always safe in a multithreaded environment Sadly, there are very few operations in the NET base class libraries that are guaranteed to be atomic Even the act of assigning a value to a member variable is not atomic! Unless the NET Framework 2.

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