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Although it s difficult to prevent deadlocks, analyzing them in Java is easy. In contrast to native C, whenever a Java application freezes you can still produce a thread dump. From the thread dump, you can get a picture of the problem. From there, it s just a small step to fix the code, lock on another lock, or use the SwingUtilities.invokeLater method to reschedule the code from the dangerous section sometime later. We used this style for a few years, resulting in unpredictable code. We didn t exterminate many of the deadlocks. When we modified the code to fix a deadlock, we often created a new one somewhere else. My favorite example is the change we made in our classes on June 26, 2000 and February 2, 2004, as shown in Figure 11-7. Both tried to fix a deadlock. The second returned us to the state that we had prior to the first integration. We had successfully shifted the amoeba shape of our code to fix a deadlock in 2000; four years later we simply shifted it again. We improved in one part, but regressed with respect to 2000 s fix. This would never have happened if, together with the first fix, we had acted in a selectively clueless manner by also writing and integrating a test!

Logic analyzers are a more recent development and came about from the need to track the digital status (high or low) of many connections in parallel, as well as a sequence of changes in series With many digital devices using 8-, 16-, or 32-bit parallel buses internally, it can be handy to have a device that reads the logic level of each bus line.

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A test for a deadlock Yes, a test for a deadlock. However surprising that might sound, it s possible and often not difficult to write a test for a deadlock. We often write a test for a deadlock in about two hours; we ve never needed more than a day. Beyond the automated nature of this kind of test, it also gives the developer the confidence to say that something has been fixed, which is usually not fully obvious due to the esoteric nature of deadlock fixes: they usually cannot be reproduced definitely not by our quality department so also cannot be verified. In addition, when there is a test, you can choose a simpler solution that fixes the problem, instead of inventing something that is both intellectually elegant and overcomplicated. The result is that the art of deadlock fixing turns into regular engineering work. And we all want our applications to be developed by engineers, don t we Writing a test for a deadlock is not that difficult. In our imaginary situation with createLabel we could do that by writing a component, overriding getPreferredSize, stopping the thread, and waiting while another thread locks the resources in the opposite way: public class DeadlockTest extends NbTestCase { static final Logger LOG = Logger.getLogger( DeadlockTest.class.getName() ); public DeadlockTest(String n) { super(n); } @Override protected int timeOut() { return 10000; }

independently and displays them all simultaneously, showing you what binary value was being transmitted at that point in time Likewise, the transmission of a sequence of bits on a single serial data line can be captured and analyzed with a logic analyzer Advanced logic analyzers can deduce a tremendous amount of information about data that is passing through the circuit under test, and many also allow the operator to assign meaningful names to each input and to group inputs together Some even apply heuristics to the data that has been acquired and process it to convert it into a meaningful form; for example, reading the raw electrical signals in an Ethernet connection and converting them into a bitstream before progressively decoding the layers of the network stack right up to, say, the HTTP packet level to display the message payload passing across the interface.

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