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Normally we view computer programs as performing a series of defined, sequential instructions with the goal of fulfilling some task. Conceptually this is correct, but in some contexts, it is possible to perform instructions in parallel (the program does more than one thing at a time). Imagine a text editor that performs a batch search-and-replace operation on a large file while still enabling the user to open other files. Programs that perform several operations in parallel are called multithreaded programs. In general, threading is wonderful without it, many problems would be difficult to solve efficiently. But even with all the power and performance benefits of multithreading, it can be difficult to get the implementation right; ask anyone who has worked on a nontrivial multithreaded application. The Apple Mac OS X developer tools come with a program called Thread Viewer that can help you understand how the threads in your program are interacting at runtime and can save you significant development time. Before I describe the program, let s briefly review the relationship between threads and processes. If you are comfortable with this topic, feel free to skip this section.

Frame Relay is a technology that covers both the physical and datalink layers of the OSI model As such, it has its own physical addressing structure, which is quite different from the Media Access Control (MAC) addressing structure A Frame Relay address is called a Data Link Connection Identifier (DLCI) Unlike MAC addresses, DLCIs do not specify the physical port; rather, they specify the logical link between two systems (virtual circuit) In this manner, each physical Frame Relay port can have multiple DLCIs because multiple VCs may be associated with that port For example, Figure 3-4 shows both the logical and physical layout of a Frame Relay implementation

One of the great attractions of e-mail, in addition to it being instantaneous (and not needing postage), is that you can attach many types of files to your message You can attach image files as well as animation files (Just be aware that many ISPs have limits on the size of an attachment) You can send photos with your e-mail, which means that you need to convince all your relatives to get an e-mail account! With the proliferation of fast connections, fast computers, and high-quality printers, using e-mail to distribute images is becoming very practical

Figure 3-4: Logical and physical layouts of one Frame Relay network In all of these Frame Relay implementations, you may be wondering what the "cloud" is Put simply, the Frame Relay cloud is your telco It is drawn as a cloud because it is "voodoo" As long as the packet enters where we want it to and leaves where we want it to, we don't care how it works Most likely, if you call your telco and have them try to explain it to you, they will say "Uguh Buguh Alacazam" and hang up OK, that last part was a joke but honestly, we don't really care from an implementation perspective However, I will shed some light on this voodoo for you just so you fully understand the technology The Frame Relay cloud is really just a huge bank of Frame Relay switches In Frame Relay terminology, two types of devices exist: the Data Communications Equipment or Data Circuit-Switching Equipment (DCE), and the Data Terminal Equipment (DTE) The DCEs are the frame switches in the cloud The DTEs are the routers The DCEs operate on the same

Threads and processes A UNIX process runs within a defined address space, has its own internal data structures and resources, and executes a set of instructions until termination The term thread defines a basic unit of execution through a process In the traditional model, where instructions proceed sequentially, we say that the process has a single thread of execution: if statement B follows statement A, B must wait for A to finish before executing For many programs, this is a perfectly acceptable design, and it is simple to implement and understand However, some programs do not fit into this model and suffer unnecessary performance bottlenecks when designed this way For example, programs that perform a long series of computations whose subsequent steps do not rely on any preceding step, or servers that must service many connections simultaneously, would benefit greatly from performing instructions in parallel, as apposed to sequentially.

basic principles as the frame routers they are just built to handle a lot of VCs simultaneously In addition, the DCEs provide what's called a clocking signal to the DTEs The clocking signal is needed because Frame Relay is a synchronous protocol: the frames are synchronized with the clocking signal, so no start bit and stop bit are needed As a result, Frame Relay becomes a little more efficient and, subsequently, faster To put these concepts into perspective, the cloud represents a fragmented path to the final destination In other words, you do not have a dedicated piece of cable supporting each of your PVCs Instead, you have a VC that may be switched through ten, hundreds, or even thousands of smaller lines on its way to its final destination This keeps the telco from having to build a new trunk for every client they add Rather, they are just reselling their current infrastructure Figure 3-5 shows an example of a simple frame cloud and how these VCs are switched