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When code waits in order to avoid stepping on other threads toes, it s possible for the application to lock up, because all the threads can end up waiting for each other to finish. This tends not to happen with simple, short operations involving just a single piece of data. Lockups typically occur when a thread that already has exclusive access to some data starts waiting for something else. The standard example involves transferring money between two bank accounts; let s call them X and Y. Suppose two threads, A and B, are both attempting to transfer money between these two accounts; A transfers money from X to Y while B transfers from Y to X. Both threads will need to use some sort of synchronization mechanism to get exclusive access to the accounts in order to avoid race conditions of the kind previously discussed. But imagine that the following happens: 1. 2. 3. 4. Initially, no threads are attempting to do anything to either account. Thread A gets exclusive access to Account X. Thread B gets exclusive access to Account Y. Thread A attempts to get exclusive access to Account Y it can t because B has access, so A waits for B to relinquish Account Y. 5. Thread B attempts to get exclusive access to Account X it can t because A has access, so B waits for A to relinquish Account X.

The exact mechanism used to manage exclusive access is irrelevant because the outcome is the same: A has come to a halt waiting for B to let go of Y. But B isn t going to let go of Y until it has managed to acquire X, and unfortunately it won t be able to A is in possession of X and has just come to a halt. Neither side can proceed because each is waiting for the other to let go. This is sometimes known as a deadly embrace. This condition can cause both deadlocks and livelocks, and the distinction has to do with the mechanism used to manage exclusive access. If threads go into a blocked state while waiting for access, neither thread is runnable once we hit the deadly embrace, and that s typically described as a deadlock the symptom is a system that has gone idle, despite having work to be getting on with. A livelock is similar, but tends to involve synchronization mechanisms that use CPU cycles while waiting some synchronization primitives actively poll for availability rather than blocking. Active polling is just as subject to a deadly embrace as a blocking approach, it just has different symptoms livelocks hang with high CPU usage.

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The two concurrency hazards just described races and deadly embraces are not the only kinds of multithreading problems. There are endless ways in which you can get into trouble in concurrent systems, so we can really only scratch the surface. For example, besides issues that can compromise the correct behavior of your code, a whole host of concurrency issues can cause performance problems. For a deep discussion of the issues and what to do about them, we recommend Concurrent Programming on Windows by Joe Duffy (Addison-Wesley).

In such an example of twofactor authentication, the bank requires the user to be authenticated based upon two methods in this case, something that the user has and something that the user knows There are other factors that can be taken into account when conducting authentication For instance, Alice s location can be considered a factor Alice may carry around a cell phone that has a GPS (Global Positioning System) chip inside of it When Alice is standing in front of an ATM requesting to withdraw money, Alice s bank could ask her cell phone company s computer system where she currently is If the cell phone company s computer responds with a latitude and longitude that corresponds to the expected location of the ATM, the bank can approve the withdrawal request.

There are several approaches for mitigating the difficulties of multithreading, each with a different trade-off between difficulty and flexibility.

In the Font section of the tab, you have familiar word processing controls. The controls apply to the text that is contained in the page and the current selection. The Paragraph section contains more word processing controls: cut, copy, paste, left align, center align, right align, bullets, decrease and increase indenting, and background color. The Insert section has buttons for adding images, mashups, tables, hyperlinks, and horizontal lines. The Advanced section has a button for layout. Click the Layout button to display a drop-down menu containing the available page layouts (see Figure 5-9). Layouts allow you to control the flow of content on the page. Text, images, and mashups can be fixed in one of the sections to ensure that, no matter the size of the browser, the appearance of your content will be consistent.

Obviously, the simplest way to avoid the risks inherent in multithreading is not to do it at all. This doesn t necessarily mean abandoning everything in this chapter, however. One of the asynchronous patterns can enable certain kinds of applications to get some of the benefits of asynchrony while sticking with a single-threaded programming model.

If you re going to have multiple threads, a good way to keep things simple is to avoid sharing information between them. ASP.NET encourages this model it uses the thread pool to handle multiple requests simultaneously, but by default each individual request runs your code on just one thread. (You can opt into an explicitly asynchronous

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