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Arrays A program can safely read from or write to an array that contains word sized elements (ie, the size of a pointer) that have been perfectly aligned (ie, no two elements span a contiguous pointer sized chunk of memory) without any additional synchronization This is because the hardware ensures such memory operations are atomic If the elements are larger than this or not properly aligned, locking will be needed Adding fine grained locking to an array is somewhat trivial We just divide the array up into chunks and assign a unique lock to each unique chunk, or alter natively use striping The design looks a lot like arrays that are parti tioned for purposes of data parallelism, as we will see in 1 3, Data and Task Parallelism

F I FO Queue Using fine-grained locking for a LIFO stack makes little sense Stacks typically don' t support random access, so concurrency is inherently limited by the single head of the stack that must be manipulated in order to push or pop FIFO queues, on the other hand, have two ends: enqueues go to one, and dequeues go to another There is a natural way to achieve better con

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currency with fine-grained locks: use two locks, one for each end This approach is correct but can be deadlock prone There are plenty of ways to build a queue, but a common way is to use a linked list In such cases, there would be two fields, one referring to the head and the other the tail Most of the time operations are completely independent But when the queue becomes small, it may be necessary to acquire both locks And, in fact, the logic (which appears simple at first) quickly becomes complicated For instance, when the first node is enqueued, both head and tail must point to it; and similarly, when the last node is dequeued, both head and tail must be changed to n U l l Ensuring both threads notice each other 's progress around empty I nonempty is difficult Here is where the logic can become deadlock prone: for example, the enqueuer acquires its lock first, then sees it must acquire the other; similarly, the dequeuer acquires its lock first, then sees it must acquire the other; neither will proceed from here We can work around this by having one of the threads first back off and then acquire the opposite lock, so that all threads acquire locks in the same order if both must be held But there is a simpler way The simpler solution to this problem is to use a sentinel node to repre sent an empty queue Thus we never have to worry about two threads operating on separate shared locations It is true that a dequeuing thread will read an enqueuing thread's writes (eg, the next pointer), but this can be done in a safe way as long as the write of the node's value is done first For example:

p u b l i c c l a s s F i neGra i n e d L i n kedQu e u e < T > { c l a s s Node { i n t e r n a l T m_va l j i n t e r n a l Node m_next j }

The PHY layer for the 10 66 GHz bands is designated as Wireless MAN-SC in the IEEE 80216 standard, since it employs a single-carrier modulation to establish LOS communications The channels used in this PHY environment are typically large, ranging from 20 to 25 MHz (typical US allocation) or 28 MHz (typical European allocation), with raw bit rates up to 134 Mbps Data bits coming from the MAC layer are randomized, FEC encoded and mapped to a QPSK, 16 QAM (optional for the uplink), or 64 QAM (optional) signal constellation The PHY layers for the 2 11 GHz bands are addressed in the IEEE 80216a standard The fundamental design choices are driven by the consideration that the receiver has to deal with

p rivate p r ivate p rivate p rivate Node m_head j Node m_t a i l j object m_enq Loc k o b j e c t m_deq Loc k

Multiple cards can be used simultaneously in a single system They capture full-frame video at 30 frames per second (fps)

p u b l i c F i neGra i n e d L i n kedQueue ( ) { m_head } p u b l i c void E n q u eue ( T obj ) { Node n n m_va l

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