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Topic: Deadlock

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In the News (Tue 16 Jul 19)

  Art Of Business Web Site Promotion
Just sign up as a deadlock referral partner, it'll take you five minutes to do and cost you nothing.
given out over the years by deadlock disciples, or post a question of your own to get help from other webmasters like yourself.
This means you may act on the advice, print the info for your own reference and link to this site as much as you like, but you may not copy any part of the text itself on your Web site / newsletter / book / magazine or any other commercial media.
deadlock.com /promote   (352 words)

  Deadlock - Wikipedia, the free encyclopedia
Deadlock is a common problem in multiprocessing where many processes share a specific type of mutually exclusive resource known as a software, or soft, lock.
Instead deadlock detection and process restart are used by employing an algorithm that tracks resource allocation and process states, and rollsback and restarts one or more of the processes in order to remove the deadlock.
Distributed deadlocks can be detected either by constructing a global wait-for graph from local wait-for graphs at a deadlock detector or by a distributed algorithm like edge chasing.
en.wikipedia.org /wiki/Deadlock   (1467 words)

 Starvation and Deadlock
Deadlock, the ultimate form of starvation, occurs when two or more threads are waiting on a condition that cannot be satisfied.
Deadlock most often occurs when two (or more) threads are each waiting for the other(s) to do something.
Thus, the applet often ends up in deadlock — that is, all the philosophers are frozen with their right hands in the air.
java.sun.com /nav/read/Tutorial/java/threads/deadlock.html   (692 words)

 Deadlock   (Site not responding. Last check: 2007-10-30)
Deadlocks are a common problem multiprocessing where many processes share a specific of mutually exclusive resource known as a lock.
Deadlock can be avoided if certain information processes is available in advance of resource For every resource request the system sees granting the request will mean that the will enter an unsafe state meaning a state that could in deadlock.
Instead deadlock detection and clean is used by employing an algorithm that the circular waiting and kills one or of the processes such that deadlock is
www.freeglossary.com /Deadlock   (1110 words)

 Distributed Deadlock Detection
Deadlock can occur whenever two or more processes are competing for limited resources and the processes are allowed to acquire and hold a resource (obtain a lock) thus preventing others from using the resource while the process waits for other resources.
Two common places where deadlocks may occur are with processes in an operating system (distributed or centralized) and with transactions in a database.
This is a deadlock: process A is waiting for a resource held by process B and process B is waiting for a resource held by process A.
www.cse.scu.edu /~jholliday/dd_9_16.htm   (1931 words)

Deadlock is unlikely to occur very often; a system can run for years without deadlock occurring.
If deadlock does occur, it may be necessary to bring the system down, or at least manually kill a number of processes, but even that is not an extreme solution in most situations.
Deadlock avoidance refers to a strategy where whenever a resource is requested, it is only granted if it cannot result in deadlock.
www.cs.rpi.edu /academics/courses/fall04/os/c10   (3110 words)

 Deadlock: Facts and details from Encyclopedia Topic   (Site not responding. Last check: 2007-10-30)
A deadlock is a situation wherein two or more competing actions are waiting for the other to finish, EHandler: no quick summary.
In the computing world deadlock refers to a specific condition when two processes are each waiting for the other to release a resource, EHandler: no quick summary.
Distributed deadlocks can be detected either by constructing a global wait-for graph from local wait-for graphs at a deadlock detector or by a distributed algorithm like edge chasing[For more info, click on this link].
www.absoluteastronomy.com /encyclopedia/d/de/deadlock.htm   (2226 words)

 Deadlock Detection
Deadlock Detection monitors the driver's use of resources which need to be locked — spin locks, mutexes, and fast mutexes.
The most common form of deadlock occurs when two or more threads wait for a resource that is owned by the other thread.
The common denominator among all deadlocks is that lock hierarchy is not respected.
www.osronline.com /ddkx/ddtools/dv_8pkj.htm   (836 words)

 CIS 307: Deadlocks
Deadlock occurs when we have a set of processes [not necessarily all the processes in the system], each holding some resources, each requesting some resources, and none of them is able to obtain what it needs, i.e.
Deadlock Prevention is to use resources in such a way that we cannot get into deadlocks.
Deadlock Detection, in the case where it is available information about the full resource allocation graph, it is easy since there is deadlock if and only if there is a loop in the resource allocation graph.
www.cis.temple.edu /~ingargio/cis307/readings/deadlock.html   (1791 words)

 Berkeley DB Reference Guide: Deadlock detection   (Site not responding. Last check: 2007-10-30)
When a deadlock exists in the system, all the threads of control involved in the deadlock are, by definition, waiting on a lock.
The deadlock detector examines the state of the lock manager and identifies a deadlock, and selects one of the lock requests to reject.
Alternatively, applications can create their own deadlock utility or thread by calling the DB_ENV->lock_detect method directly, or by using the DB_ENV->set_lk_detect method to configure Berkeley DB to automatically run the deadlock detector whenever there is a conflict over a lock.
www.sleepycat.com /docs/ref/lock/dead.html   (552 words)

 OnPolitics (washingtonpost.com)
These stories are the basis for "Deadlock: The Inside Story of America's Closest Election," by the political staff of The Washington Post, published by PublicAffairs.
This series of stories is based on dozens of interviews with participants in the Florida recount, including President Bush, Vice President Cheney, Sen. Joseph I. Lieberman and Florida Secretary of State Katherine Harris, lawyers and strategists for the presidential campaigns of Bush and former Vice President Al Gore and state and county officials.
With the election deadlocked, Gore and Bush each moved rapidly to map their political and legal strategies in Florida, resulting in the Bush team's decision to pursue federal court action.
www.washingtonpost.com /wp-dyn/politics/news/postseries/deadlock   (489 words)

 SQL Server technical bulletin - How to resolve a deadlock
A SQL Profiler trace also has a lock event for "deadlock" and for "deadlock chain." "Deadlock" corresponds to the -T1204 flag, and "deadlock chain" corresponds to the -T1205 flag.
Turning on the deadlock trace flags and running a SQL Profiler trace during the occurrence of a deadlock should provide you the data that you must have to troubleshoot a deadlock.
With any deadlock case, you must obtain the –T1204 startup parameter output, and the SQL Profiler trace to identify, to troubleshoot, and to resolve the deadlock.
support.microsoft.com /default.aspx?scid=kb;en-us;832524   (1618 words)

 Extending Java to Support Shared Resource Protection and Deadlock Detection in Threads Programming
Deadlock is the one of the other common problems in parallel programming and is often extremely difficult to detect.
Deadlock is an event where threads hold resources demanded by other threads, resulting in cross dependencies.
Deadlock is detected by creating a graph of the dependencies and testing for cyclic behavior for each new request.
www.cs.hope.edu /~dershem/reu/papers97/jipteam/Final.html   (4853 words)

 Deadlock Detection
Notice that if there is a circular wait among the processes, then it implies that a deadlock has occurred.
Given a resource allocation graph in which each resource type has exactly one instance, your job is to determine whether there is a deadlock in the system.
In case a deadlock exists, you must also show the sequence of processes and resources involved.
acm.uva.es /p/v8/840.html   (344 words)

 Berkeley DB Reference Guide: Deadlock detection   (Site not responding. Last check: 2007-10-30)
The first component of the infrastructure, deadlock detection, is not so much a requirement specific to transaction-protected applications, but instead is necessary for almost all applications in which more than a single thread of control will be accessing the database at one time.
Alternatively, applications can create their own deadlock utility or thread using the underlying DB_ENV->lock_detect function, or specify that Berkeley DB run the deadlock detector internally whenever there is a conflict over a lock (see DB_ENV->set_lk_detect for more information).
Deciding how often to run the deadlock detector and which of the deadlocked transactions will be forced to abort when the deadlock is detected is a common tuning parameter for Berkeley DB applications.
www.sleepycat.com /docs/ref/transapp/deadlock.html   (549 words)

 Deadlock : Planetary Conquest
It's your job to build your colony, expand into other territories, and ultimately win the war against the other five races and gain control of Gallius IV and cement your race's as well as your own place in history.
And Deadlock is no slacker in that department either.
Deadlock has already swept the Web and has a lot of followers.
www.worldvillage.com /wv/gamezone/html/reviews/deadl.htm   (647 words)

 AskTom "Reading deadlock trace files"   (Site not responding. Last check: 2007-10-30)
It is a deadlock due to user error in the design of an application or from issuing incorrect ad-hoc SQL.
This deadlock is usually due to user errors in the design of an application or from issuing a set of concurrent statements which can cause a deadlock.
Tom, yes the deadlock occured in the index.It was bitmap index.
asktom.oracle.com /pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:1528515465282   (6059 words)

 AskTom "Determining which query caused deadlock."
Is there a chance for lost action (it may have to do an update or insert a record and because of deadlock it might ignore it?) What happens if it is in a loop (a loop of inserts or updates and the deadlock occurs).
I see the sessions are deadlocked, but from the application point, is it possible that application b misses adding somerows i.e 150 to 160, skip them and later commit.
deadlocks are checked for every N seconds and you "got unlucky" as the deadlock check found you both waiting for eachother -- not knowing one of you would give up a short period later, it undeadlocked you.
asktom.oracle.com /pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:6369740147072   (4714 words)

 Oracle: deadlock : clarify
Rather than monitoring you should be able to avoid deadlocks, first by reducing locks, minimizing transactions, using a common locking schema (like locking tables in alphabetical order before using them...)
This is the simplest deadlock scenario to identify and resolve.
The most common lock types seen in deadlock graphs are TX and TM locks.
www.experts-exchange.com /Databases/Oracle/Q_20274800.html   (1222 words)

 Amazon.com: Deadlock: Books: James Scott Bell   (Site not responding. Last check: 2007-10-30)
Deadlock is an exciting legal thriller by one of the best Christian authors today, James Scott Bell.
In Deadlock, Bell tackles the hot button issue of abortion from the political and judicial point of view, pointing out just how divisive the issue is to our country.
Deadlock is a solid Christian novel that asks the right questions, keeps the heart pumping, and weaves a sure, but subtle Christian theme throughout.
www.snipurl.com /6bac   (1944 words)

 Citations: Graph-theoretic deadlock detection and resolution for flexible manufacturing systems - Cho, Kumaran, Wysk ...   (Site not responding. Last check: 2007-10-30)
In, Cho, Kumaran, Richard and Wysk s approach for the deadlock detection and resolution is to classify the network layout as bounded circuits.
However, as it will become clear in the ensuing sections of this chapter, the most severe problem in designing practical solutions to the FMS deadlock, is the lack of a parsimonious representation of the states to be forbidden.
Here, the authors suggest that a deadlock detection algorithm, presented in [67] be applied to the state that results if a considered request is granted.
citeseer.ist.psu.edu /context/1160006/0   (635 words)

 [No title]
DeadLock bent double from his perch of the Vulpine's shoulder so that he looked at Hanover face-to-face, though upside down.
Hanover growled and shoved DeadLock from his shoulders, causing the other to fly through the air, land in a roll, and then stand with a dramatic flourish.
Windigo and DeadLock followed after, walking in step to Hanover and humming 'Pinky and the Brain' under their breaths.
www.jihad.net /pacifica/rootpac24.txt   (931 words)

 Potential Deadlock   (Site not responding. Last check: 2007-10-30)
The problem, as you might guess, was a deadlock in the window system.
However, the deadlock did not involve two different locks, but a single lock and the interrupt enable flag.
Not only does the code ignore the possibility of deadlock when siezing a lock with interrupts disabled, it deliberately turns interrupts off before attempting to seize the lock, thus exacerbating the situation.
home.comcast.net /~prunesquallor/deadlock.html   (1190 words)

 The Old Joel on Software Forum - Deadlock
That said, test on a multi-CPU machine (on which deadlocks are more easily triggered, because more threads are really executing simultaneously).
It is tempting to try and fix to the deadlock situation by testing the state of the process we'll be waiting on:
This sequence is clearly susceptible to deadlock, but it's not obvious that the code above causes this sequence of operations.
discuss.fogcreek.com /joelonsoftware?cmd=show&ixPost=143881   (1117 words)

 How can I avoiding deadlock? - dBforums
Frequently, people mix the concept of deadlock and timeout, when they are actually not the same.
A deadlock (as described by ARWinner) would theoretically NEVER be resolved except when the database manager detects the probable deadlock, and then cancels one of the processes.
An ordinary timeout due contention can occur when a process is waiting for a lock to be released by another process, but the defined wait period has been exceeded, and the process is then cancelled.
www.dbforums.com /showthread.php?t=798108&goto=nextnewest   (1004 words)

 Deadlock   (Site not responding. Last check: 2007-10-30)
Deadlock occurs when two or more processes are prevented from going forward.
Recover from the deadlock by restarting or backing up processes.
Do not allow requests that would make it possible to deadlock the system.
www.eecs.utoledo.edu /~jheuring/EECS2550/Overheads/June08.html   (185 words)

 deadlock from FOLDOC   (Site not responding. Last check: 2007-10-30)
A common example is a program waiting for output from a server while the server is waiting for more input from the controlling program before outputting anything.
It is reported that this particular flavour of deadlock is sometimes called a "starvation deadlock", though the term "starvation" is more properly used for situations where a program can never run simply because it never gets high enough priority.
This is the more popular term in Europe, while deadlock predominates in the United States.
foldoc.org /foldoc/foldoc.cgi?deadlock   (199 words)

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