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For example, he could make a request such that the request parameter month evaluates to 0 AND 1=0 UNION SELECT cardholder, number, exp_month, exp_year FROM creditcards Then, the SQL query that the application constructs and sends to the database becomes SELECT pizza, toppings, quantity, order_day FROM orders WHERE userid=4123 AND order_month=0 AND 1=0 UNION SELECT cardholder, number, exp_month, exp_year FROM creditcards.

Notice that we added a new field, lockObject, which holds a reference to an object whose only job is to be the thing on which we acquire a lock. And we simply acquire this lock inside the methods that work with the list of items. We have to hold the lock for the whole of the UseItem method, because the code looks at the state of the items list right at the start, and then the rest of its operation is guided by what it found. The code simply won t work if the items list changes halfway through, and so we hold on to the lock for the duration. In this particular case, holding the lock for the whole method is unlikely to cause problems because this method won t take long to run. But as a general rule, you want to avoid holding locks for any longer than necessary. The longer you hold a lock, the greater the chances of some other thread wanting to acquire the same lock, and being forced to wait. It s a particularly bad idea to call code that might make a request over a network and wait for a response while you re holding a lock (e.g., holding a lock while making a request to a database).

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Be particularly wary of acquiring multiple locks holding on to a lock while attempting to acquire another is a good recipe for deadlock. Sometimes it s inevitable, though, in which case you need to devise a strategy to avoid deadlocks. That s beyond the scope of this book, but if you find yourself in this situation lock leveling is a suitable solution to this problem searching the Web for lock leveling for multithreading would be a good place to start.

As we mentioned several pages ago, the Monitor class isn t just about locking. It also provides a form of notification.

Suppose we want to write some code that tests our MostRecentlyUsed class in multithreaded scenarios Even relatively simple tests pose a challenge: for example, what if we want to verify that after a call to UseItem has returned on one thread, the item it passed in becomes visible as the first item returned if some different thread calls GetItems We re not testing concurrent use we re just testing sequential operations, where one thing happens on one thread and then something else happens on another How would we write a test that coordinated these steps across threads We need one thread to wait until the other has done something We could just use the Thread class s Join method again, waiting for the first thread to exit.

The SQL UNION syntax instructs the database to combine the result sets of two SELECT statements. In this case, the attacker has arranged for the first SELECT statement to return an empty result set by injecting a 1=0 (i.e., false) into the WHERE clause of the first SELECT statement. He then uses UNION to combine this empty result set with the result set of the second injected SELECT statement, whose result columns were chosen to match the data types of the first statement. Thus, the preceding statement has the effect of returning the result of the query SELECT cardholder, number, exp_month, exp_year FROM creditcards to the application in a result set with the columns pizza, toppings, quantity, and order_day. The application, in turn, takes the rows of the result set and transcribes them into the order history HTML table. As a result, the attacker receives an HTML document from the web server that contains the entire contents of the creditcards table in an HTML table (Figure 8-3 shows what the page might look like in a browser): <TABLE> <TR><TD>Pizza</TD> <TD>Toppings</TD> <TD>Quantity</TD> <TD>Order Day</TD> </TR> <TR><TD>Neil Daswani</TD> <TD>1234 1234 9999 1111</TD> <TD>11</TD> <TD>2007</TD> </TR> <TR><TD>Christoph Kern</TD> <TD>1234 4321 3333 2222</TD> <TD>4</TD> <TD>2008</TD> </TR> <TR><TD>Anita Kesavan</TD> <TD>2354 7777 1111 1234</TD> <TD>3</TD> <TD>2007</TD> </TR> ... </TABLE>

But what if we don t want to let it exit We might want to perform a sequence of operations, with each thread taking it in turns Monitors can help with this as well as protecting shared state, they also provide a way to discover when that state may have changed The Monitor class provides a Wait method that operates in conjunction with either a method called Pulse or the related PulseAll A thread that is waiting for something to change can call Wait, which will block until some other thread calls Pulse or PulseAll You must already hold the lock on the object you pass as an argument to Wait, Pulse, or PulseAll Calling them without possessing the lock will result in an exception Example 16-14 uses this mechanism to provide the ability for one thread to wait for a second thread to do something.

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