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This lock structure, consisting of a state and a counter for acquired locks, is commonly known as a semaphore. A specialized version of a semaphore, known as a mutex, for mutually exclusive, is a simpler Boolean type of semaphore (known as a binary semaphore). Mutexes typically just describe to the program whether a resource, or critical section of memory, is available for a process to modify. Additionally, a mutex structure usually contains some sort of owner identifier, informing the system which process owns, or controls, the resource. Semaphore and mutex lock structures are used internally by the database server and the operating system to control access to critical sections of the program that may be shared among running threads or processes. These lock structures need to control access to database resources. Any resource (or variable) shared by multiple processes can be controlled.

A number of different types of illumination are available to shine onto our objects. Any or all of the illumination types can be applied to XNA s lighting model, and the color of each type of illumination can be specified independently. Let s take a look at each of the illumination types that a light can use.

ANSI/ISO SQL-92 specifications define four distinct levels of isolation. The level of isolation refers to the strength of the protection against certain consequences of concurrently executing transactions. These consequences are known as anomalies, in transaction processing lingo, and we ll cover the three types of anomalies as we take a look at each supported isolation level: READ UNCOMMITTED: Weak protection READ COMMITTED: Better protection REPEATABLE READ: Good protection SERIALIZABLE: Zero anomalies

The JMFCapture class of 9 for grabbing pictures from a webcam is the basis of the two image processing examples described in this chapter. The FindBands application demonstrates a basic form of pattern recognition (segmentation, feature extraction, and classification) that finds the largest visible colored band on a wrist strap. FindBands acts as a test rig for the image processing classes (BandsAnalyzer, BandManager, and Blob) utilized in BandObjView3D (the chapter s second example). BandObjView3D converts wrist strap movements into navigational commands for exploring the Java 3D world described in 7.

The simplest type of light is ambient light, which is light that comes from all directions at once and falls equally on to all parts of each object rendered. It is completely flat in intensity, leaving no bright or dark areas on the objects that it illuminates. In the real world, the closest analogy to ambient light is the light that is reflected from all the objects in the environment. If you are in a room with a single light source, those areas of the room that are not in direct line of sight from the bulb still receive some light from their surroundings. This is the illumination that ambient light seeks to simulate. When an ambient light is present, all vertices will be equally lit by the appropriate ambient light level. An example object illuminated with ambient light can be seen in Figure 7 17. The figure shows a 3D cylinder with a medium-intensity ambient light applied and no other lighting. Note how the object appears just as a silhouette: no variation of light intensity can be seen anywhere within the object.

At the READ UNCOMMITTED isolation level, there really isn t much protection at all. Other transactions may see changes to data that have occurred within an uncommitted transaction. Clearly, this isn t a good thing, since the other transactions may rely on information that may eventually be rolled back. This anomaly, or phenomenon, is known as a dirty read. Dirty reads are reads that cannot be relied on.

Figure 7 17. A cylinder illuminated with an ambient light source XNA s default ambient light is black, meaning that no ambient light appears within the rendered scene at all.

laying PC games with a keyboard and mouse can sometimes feel like playing tennis in a tuxedo entirely possible but not quite right. Wouldn t it be so much cooler to pull out that gamepad, joystick, or steering wheel, plug it in, and play games the way that nature intended It s not that difficult, as the next two chapters will show. I start by giving some background on JInput (https://jinput.dev.java.net/), an open source API for game controller discovery and polled input. I explain how to program with JInput by describing three small applications that display information about the input devices attached to your PC. I also develop a GamePadController class that offers a simplified interface to my gamepad. GamePadController is utilized in two examples: a Swing application called GamePadViewer in this chapter, and a revised version of Arms3D (the articulated arms example from 4) in the next chapter. Arms3D illustrates how a gamepad can enhance the user s playing experience, replacing a confusing mix of keys with more intuitive buttons and sticks. The gamepad also allows multiple inputs to be processed at once, so that different parts of the grabber s arms can rotate and move at the same time.