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Topic: Priority queue

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	Priority queue - Wikipedia, the free encyclopedia
		The simplest way to implement a priority queue data type is to keep a list of records containing elements and priorities; removing an element requires searching the list sequentially for the element with the highest priority.
		Priority queuing can be used to manage limited resources such as bandwidth on a transmission line from a network router.
		In the event of outgoing traffic queuing due to insufficient bandwidth, all other queues can be halted to send the traffic from the highest priority queue upon arrival.
	en.wikipedia.org /wiki/Priority_queue (444 words)

	Priority queue (Site not responding. Last check: 2007-11-07)
		This makes removing an element O (''n) in the number of elements in the queue, which is somewhat inefficient if the queue gets large; a heap is a more efficient way to implement a priority queue for a large number of elements.
		Queue FTP Allows you to connect to FTP sites, add files to a queue, and download later. If the site is full, then it will retry.
		Priority Inheritance Protocols Use of synchronization mechanisms like semaphores, monitors, and critical regions can lead to uncontrolled priority inversion.
	www.serebella.com /encyclopedia/article-Priority_queue.html (687 words)

	Priority queue (Site not responding. Last check: 2007-11-07)
		This makes removing an element O (n) in the number ofelements in the queue, which is somewhat inefficient if the queue gets large; a heap is amore efficient way to implement a priority queue for a large number of elements.
		Priority queuing can be used to manage limited resources such as bandwidth ona transmission line from a network router.
		In the event of outgoing traffic queuing due to insufficientbandwidth, all other queues can be halted to send the traffic from the highest priority queue upon arrival.
	www.therfcc.org /priority-queue-83808.html (295 words)

	The Priority Queue Operations
		The priority queue data type is built on top of a container class, which is the structure actually used to maintain the values in the collection.
		Queues constructed out of vectors tend to be somewhat smaller, while queues constructed out of deques can be somewhat faster, particularly if the number of elements in the queue varies widely over the course of execution.
		Because the priority queue data structure does not itself know how to construct iterators, very few of the algorithms noted in Chapter 13 can be used with priority queues.
	www.roguewave.com /support/docs/hppdocs/stdug/11-2.html (404 words)

	Heaps and Priority Queues (Site not responding. Last check: 2007-11-07)
		However, items are withdrawn from a priority queue in order of their priorities starting with the highest priority item first.
		An alternative solution is to use a priority queue in which the shorter a document, the higher its priority.
		Priority queues are often used in the implementation of algorithms.
	www.brpreiss.com /books/opus5/html/page350.html (332 words)

	Priority Queue
		The highest priority element is a[1], and can be returned, but this leaves a hole at position 1.
		Elements to be inserted into the priority queue should be put in the `add' window, then use the add button.
		Do not confuse a queue with a priority queue; the former can be thought of as a special case of the latter in which priority is time of arrival, but a queue is far simpler to implement than a priority queue.
	www.csse.monash.edu.au /~lloyd/tildeAlgDS/Priority-Q (657 words)

	priority queue (Site not responding. Last check: 2007-11-07)
		Some implementations also efficiently support join two priority queues (meld), delete an arbitrary item, and increase the priority of a item (decrease-key).
		where PQ is a priority queue, v and w are items, and priority(v) is the priority of item v.
		Paul E. Black, "priority queue", from Dictionary of Algorithms and Data Structures, Paul E. Black, ed., NIST.
	www.nist.gov /dads/HTML/priorityque.html (224 words)

	Priority Queues and the STL
		This article will first show you just what a priority queue is. Next, you will see how the STL implements a priority queue using its heap algorithms.
		In the case of the priority queue, there is an approach that is superior to either of these methods.
		Those two nodes are then removed from the pool of available nodes (the priority queue.) A new internal node is then created, and it is assigned those two nodes as children.
	dogma.net /markn/articles/pq_stl/priority.htm (3201 words)

	[No title]
		6.1-6.3.3) One place a priority queue is seen is in the emergency room of a hospital.
		The insert is equivalent to enqueue and deleteMin is equivalent to dequeue in a regular queue.
		For any node N, the priority (also called the key) of the parent of N is less than or equal to the key in N (except for the root, which has no parent) Ex.
	www.cs.unc.edu /~vanbusum/comp121f01/handouts/Priority_Queues (672 words)

	Topic #15
		Priority Queue A.D.T. A priority queue is a data structure for maintaining a set of elements, each with an associated value called a key.
		Thus, a priority queue can be used to find either a minimum or a maximum, but this needs to be known a priori.
		Priority queues can also be used to sort in a very efficient manner.
	www.cs.mcgill.ca /~cs251/OldCourses/1997/topic15 (1282 words)

	Priority Queues (Site not responding. Last check: 2007-11-07)
		Bounded height priority queues are very useful in maintaining the vertices of a graph sorted by degree, which is a fundamental operation in graph algorithms.
		Bare bones implementations in C and Pascal of the basic priority queue data structures appear in [GBY91].
		Bounded height priority queues are useful data structures in practice, but they do not have good worst-case performance bounds when arbitrary insertions and deletions are permitted.
	www2.toki.or.id /book/AlgDesignManual/BOOK/BOOK3/NODE130.HTM (1176 words)

	Prioritized Listen Queue: Simple Priority
		Clients belonging to a common priority level are all created by a Webstone benchmark that requests an 8 KB file.
		When the number of high priority requests increases, the lower priority ones are shifted back in the listen queue, thereby, increasing their response times.
		We also observed that when the number of high priority requests was fixed and the lower priority request rate was steadily increased, the response time of the high priority requests remained unaffected.
	www.usenix.org /event/usenix01/full_papers/voigt/voigt_html/node14.html (467 words)

	Linux Priority-Queue Scheduler (Site not responding. Last check: 2007-11-07)
		The basic premise is that by maintaining multiple priority queues and limiting the number of queues to be searched we hope to reduce the number of tasks inspected during the scheduling cycle and thus reduce the lock hold time.
		The child's priority queue does not have to be updated, because the child is not yet enqueued in the priority queue.
		Rather then searching the entire run queue list, as done in the current scheduler, we first determine the proper range of priority queues to be searched for a proper task.
	lse.sourceforge.net /scheduling/PrioScheduler.html (1901 words)

	C++ Priority Queues (Site not responding. Last check: 2007-11-07)
		Priority queues can be constructed with an optional compare function cmp' and an optional container c.
		If start and end are specified, the priority queue will be constructed with the elements between start and end.
		The size() function returns the number of elements in the current priority queue.
	www.cppreference.com /cpppriorityqueue_details.html (237 words)

	OOP - Priority Queue Assignment
		A simple queue can be modeled by a data structure that allows the insertion of elements at the back of the container (the enqueue operation) and extracts information from the front of the container (the dequeue operation).
		When removing items from the queue, items with a higher priority are removed first, however, items with the same priority are removed from the queue using the standard FIFO ordering.
		That is any storage allocated in you priority queue class should be automatically deallocated when priority queue objects are destroyed or go out of scope (Hint: use the destructor).
	www.cs.drexel.edu /~bmitchel/course/mcs350/priorityQ_hw.html (737 words)

	Using priority_queue
		In this queue std::priority_queue it is true that top() return Foo const& (or, same thing, const Foo&) and therefore you cannot use top() to modify the Foo object in the queue.
		In other words since your queue is now storing pointers you cannot use top() to modify the pointer itself but there is nothing stopping you modifying what the pointer is pointing at (or deleting the pointer).
		Basically the elements of a priority_queue are non modifyable while they are in the queue, but if the elements are pointers, then it is the pointers themselves that are const, not what they are pointing to.
	www.codecomments.com /showthread.php?threadid=238798&goto=nextnewest (1377 words)

	Tatarize - Content (Site not responding. Last check: 2007-11-07)
		Its possible to setup a queue in such a way that anybody whose name starts with a "Q" gets a higher queue priority than anybody else.
		On Trigger will allow for specific queues to only be available to certain triggers, such as a seperate high priority queue pool for people accessing a trigger that you have setup for a guide or document.
		Queue Guard kills the sends fservers and queues of people who have departed all serving channels for a period longer than five minutes.
	tatarize.com /modules.php?name=Content&pa=showpage&pid=2 (1151 words)

	Configuring Priority Queueing (Site not responding. Last check: 2007-11-07)
		The priority list specifies which queue a packet will be placed in and, optionally, the maximum length of the different queues.
		IP packets originating or destined to TCP port 23 are assigned a medium priority queue level.
		All IP packets are assigned a high priority queue level.
	www.cisco.com /univercd/cc/td/doc/product/software/ios120/12cgcr/qos_c/qcpart2/qcpq.htm (695 words)

	Bounded Priority Queues ( b_priority_queue ) (Site not responding. Last check: 2007-11-07)
		section Priority Queues) whose information type is a fixed interval [a..
		Bounded priority queues are implemented by arrays of linear lists.
		Operations insert, find_min, del_item, decrease_inf, key, inf, and empty take time O(1), del_min (= del_item for the minimal element) takes time O(d), where d is the distance of the minimal element to the next bigger element in the queue (= O(b - a) in the worst case).
	www.cs.bgu.ac.il /~cgproj/LEDA/b_priority_queue.html (128 words)

	[No title] (Site not responding. Last check: 2007-11-07)
		1) insert the interval (a,b) in a priority queue.
		2) so long as the sum of all errors in the priority queue is greater than a threshold eps, pop the largest error interval and split it into two subintervals, which are then reinserted in the priority queue.
		The priority queue is a bit unusual, but it will help if the integrand is mostly good with a few regions where it's hard to integrate.
	www.math.mcgill.ca /loisel/numerical-integration.html (286 words)

	ASPN : Python Cookbook : Criteria-based cascading priority queue (Site not responding. Last check: 2007-11-07)
		There is no need to add an "all pass" criterion at the end; the queue will add all non-matching items with the least priority.
		This is a very simple queue that automatically sets item priorities using the criteria functions provided by the user.
		The term "priority cascading" simply means that items with a given priority will only be retrieved when higher ranked items have been exhausted.
	aspn.activestate.com /ASPN/Cookbook/Python/Recipe/364952 (170 words)

	Old-Style Priority Queues ( priority_queue )
		If Q has size zero it is called the empty priority queue.
		queue except that the meanings of K and I are interchanged.
		Priority queues are implemented by Fibonacci heaps [
	www.cs.bgu.ac.il /~cgproj/LEDA/priority_queue.html (239 words)

	The priority queue Data Abstraction (Site not responding. Last check: 2007-11-07)
		A more computer-related example of a priority queue is the list of pending processes maintained by an operating system, where the value associated with each element is the priority of the job.
		By maintaining processes in a priority queue, those jobs with urgent priority are executed prior to any jobs with less urgent requirements.
		The data structure is not a queue in the sense that we used the term in Chapter 10, since it does not return elements in a strict first-in, first-out sequence.
	www.roguewave.com /support/docs/sourcepro/stdlibug/11-1.html (423 words)

	ASPN : Python Cookbook : Heap-based priority queue (Site not responding. Last check: 2007-11-07)
		This is a Priority Queue based on a heap data strucuture.
		A priority queue can be used as the heart of a time-based simulation.
		In such cases (if priorities can be equal), you should change the comparison to look only at priorities.
	aspn.activestate.com /ASPN/Cookbook/Python/Recipe/81693 (361 words)

	PRIORITY QUEUE
		A priority queue adaptor produces a queue in which values are accessible in an order controlled by a comparison parameter.
		Container is the type of container used to hold the priority queue, which by default is vector.
		By default, the comparison function object is less, which orders the priority queue from highest to lowest.
	acc6.its.brooklyn.cuny.edu /~cis22/stl/priority_queue.htm (290 words)

	jit.qball (Site not responding. Last check: 2007-11-07)
		When the low priority queue services this message, it will be sent out the left outlet.
		If the message received is being sent from the low priority queue it is immediately sent out the leftmost outlet.
		, and the low priority queue has not yet serviced the last received message, it will be replaced by the most recently received message.
	www.cycling74.com /jitter-ref/jit.qball.html (172 words)

	Maintaining a Priority Queue and Displaying Text in Multiple Styles
		For the simple case where the number of priorities is fixed (and small in quantity), you can manage the priorities of the items using an array.
		For the more complicated case, where the number of priorities is large, it is common to replace the priorities array with a linked list for the set of priorities.
		When the end of that iterator is hit, the iterator for the next priority item comes into play, and so on until no more priorities (and their associated iterator) is available.
	java.sun.com /developer/JDCTechTips/2002/tt0821.html (1862 words)

	priority_queue<T, Sequence, Compare>
		Defined in the standard header queue, and in the nonstandard backward-compatibility header stack.h.
		[1] Priority queues are a standard concept, and can be implemented in many different ways; this implementation uses heaps.
		Priority queues are discussed in all algorithm books; see, for example, section 5.2.3 of Knuth.
	www.sgi.com /tech/stl/priority_queue.html (528 words)

	monotone priority queue (Site not responding. Last check: 2007-11-07)
		Definition: A priority queue in which a key being inserted is never higher in priority than a previously deleted node.
		Note: The keys deleted from a monotone priority queue form a monotonically increasing or monotonically decreasing sequence -- hence the name.
		Paul E. Black, "monotone priority queue", from Dictionary of Algorithms and Data Structures, Paul E. Black, ed., NIST.
	www.nist.gov /dads/HTML/monotonprioq.html (94 words)

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