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What is the intended behavior of this code When adding an item, we use the E n q u e u e method on Qu e u e < T > inside of a lock region, and call Set on the Aut o R e s et E vent, ensuring it is signaled and that a single thread waiting for an element is awakened When removing an item, we check the Count of the Qu e u e < T > inside of a lock and, if empty, exit the lock and call Wa itOne on the event Once an element becomes available, we will wake up and loop around to remove it There are obvious races here that lead to unfair ness, so if we're awakened and lose the race, you'd think we will just rewait for the next element However, imagine two threads t1 and t2 call Remove, and both end up context switched out right after releasing the lock but before getting to call ing Wa i t O n e Now some thread t3 calls Add twice, placing two elements in the queue and calling Set on the event twice Recall that the second call to Set is effectively ignored since the event was already signaled Now when t1 resumes and calls Wa i t O n e, it wakes up right away and transitions the auto-reset event back into the unsignaled state It loops around and snags one of the two items out of the queue Now t2 resumes and also calls

threads add elements to the queue or come back for the last remaining item, the system is locked up, items may be dropped, and threads may hang Other problems can lead to event signals being missed Even if both threads had called Wa i t On e by the time t3 added its two items, event signals

could get missed This is because, as was explained back in 5, Windows Kernel Synchronization, operations such as interrupts and APCs can cause a thread to temporarily remove and re-add itself from and to the wait queue This particular issue is tricky because we must exit the lock before wait ing The coding pattern becomes simpler with condition variables because they address this very situation

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have worked in the streaming video industry for many years, and I have found that the best way to provide a high-quality stream is to use highquality products A number of the products I describe in this chapter are capable of both audio and video capture, although a few are capable of only one type of capture Some of the most popular, high-quality capture cards available will be reviewed, starting with Osprey

Livelocks A livelock, as its name implies, is a condition in which threads get "locked up" Livelocks are a lot like a deadlock, hence the similarity in name, but lead to "busy" waits rather than stalls and are more often finite in duration (at least statistically speaking) Everybody has probably encountered a situation akin to a livelock in real life: just think of the last time you were walking down a hallway in the opposite of another individual; as they approach, you realize you must step to the right or left to avoid collision; they also realize the same; they first choose right, and you choose left; both of you realize this won't work, and reverse your direction, to no avail; this pattern is apt to repeat a few times until something gives This is a lot like livelock, where multiple threads collide but politely try to get out of each other's way Livelock commonly happens in low-level concurrency algorithms that involve optimistic concurrency and /or spin-waiting A loop is usually involved And often they can manifest as a single thread being livelocked versus a whole set of threads being livelocked simultaneously, although both situations are possible Nonblocking code such as the lock free algo rithms we took a look at in the last chapter trade off deadlock for livelock As an example of a livelock prone piece of code, say that many threads are trying to increment a shared counter using I n t e r l o c k e d Compa r e

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The growing demand for high-speed Internet access to small of ce/home of ce (SOHO), to small to medium enterprise (SME) premises and to residential customers is increasing the need for network infrastructures able to provide last mile broadband access Traditionally, broadband and converged services are accessed through large-capacity, high-speed ber optic networks Today, small businesses and residential customers typically use wired networks such as cable modem networks and DSL Currently, wireless short-range high-speed technologies, such as the IEEE 80211b (Wi-Fi) technology, provide cost-effective solutions to offer customers high-speed remote access to the Internet in public areas, known as hotspots

s t a t i c volat i l e int s_counter int C j do { } while ( I nterloc ked Compa reE x c h a nge ( ref s_c o u n t e r , c + 1 , c ) ! = c ) j

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