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| | 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. | | | One known algorithm that is used for deadlock avoidance is the Banker's algorithm, which requires resource usage limit to be known in advance. | | | Coffman, E.G., M.J. Elphick, and A. Shoshani, System Deadlocks, ACM Computing Surveys, 3, 2, 67-78 (1971). |
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http://en.wikipedia.org/wiki/Deadlock
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| | Distributed Deadlock Detection |
| | Deadlock Detection in Distributed Databases, ACM Computing Surveys, 19(4), 303-328, December 1987. | | | One way to detect deadlocks in distributed systems is for each site to construct a local WFG on the part it knows about. | | | In deadlock avoidance the system considers resource requests while the processes are running and takes action to insure that those requests do not lead to deadlock. |
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http://www.cse.scu.edu/~jholliday/dd_9_16.htm
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| | CIS 307: 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. | | | Deadlock avoidance is essentially not used in distributed systems. | | | There is a deadlock in a system if and only if there is a loop in the wait-for graph of that system. |
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http://www.cis.temple.edu/~ingargio/cis307/readings/deadlock.html
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| | Deadlock |
| | Deadlock avoidance refers to a strategy where whenever a resource is requested, it is only granted if it cannot result in deadlock. | | | Deadlock is a terrific theoretical problem for graduate students, but none of the solutions discussed above can be implemented in a real world, general purpose operating system. | | | For example, many database operations involve locking several records, and this can result in deadlock, so database software often has a deadlock prevention algorithm. |
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http://www.cs.rpi.edu/academics/courses/fall04/os/c10
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| | Deadlock Detection |
| | Deadlock Detection monitors the driver's use of resources which need to be locked — spin locks, mutexes, and fast mutexes. | | | There is a detailed example of the !deadlock extension, as well as general information about debugger extensions, in the documentation in the Debugging Tools for Windows package. | | | These deadlocks require a certain degree of "bad luck" since they rely on a number of things happening simultaneously. |
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http://www.osronline.com/ddkx/ddtools/dv_8pkj.htm
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| | SQL Server technical bulletin - How to resolve a deadlock |
| | When a lock manager’s deadlock detection algorithm detects a deadlock, the lock manager chooses one of the SPIDs as a victim. | | | This is only one example of a deadlock case that involves locks. | | | The -T1205 startup parameter collects information every time that the deadlock algorithm checks for a deadlock, not when a deadlock is encountered. |
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http://support.microsoft.com/default.aspx?scid=kb;en-us;832524
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| | Extending Java to Support Shared Resource Protection and Deadlock Detection in Threads Programming |
| | The additional time for the Deadlock Detection is due to the algorithm involved in the DeadlockDetection class. | | | In a system where deadlock is a potential problem, this view can show where a deadlock situation is occurring. | | | If an error occurs due to corrupted data or a deadlock of the resources, an exception is thrown for the Application to deal with or to allow the program to close without corrupting the data. |
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http://www.cs.hope.edu/~dershem/reu/papers97/jipteam/Final.html
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| | Citations: Graph-theoretic deadlock detection and resolution for flexible manufacturing systems - Cho, Kumaran, Wysk ... |
| | 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. | | | The computation per iteration is in O(mn) where n is the number of nodes and m is the number of arcs of the network. | | | 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. |
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http://citeseer.ist.psu.edu/context/1160006/0
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| | Berkeley DB Reference Guide: Deadlock detection |
| | When a deadlock exists in the system, all the threads of control involved in the deadlock are, by definition, waiting on a lock. | | | More precisely, the deadlock detector reads through the lock table, and reviews each lock object currently locked. | | | Each object has lockers that currently hold locks on the object and possibly a list of lockers waiting for a lock on the object. |
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http://www.sleepycat.com/docs/ref/lock/dead.html
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| | Potential Deadlock |
| | The problem, as you might guess, was a deadlock in the window system. | | | Instead of deterministically generating an immediate error (and thus letting the implementor know that his code may deadlock), it would only fail under conditions of high load or bad luck. | | | Allowing the program to proceed masks the error making it less likely that it will be discovered and fixed early on, and making it more likely that the program will deadlock under high load. |
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http://home.comcast.net/~prunesquallor/deadlock.html
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| | CITIDEL: Viewing 'Local distributed deadlock detection by knot detection' |
| | Using the knot detection algorithm as a building block, a deadlock detection algorithm in a dynamic environment is developed. | | | The algorithm is triggered only when there is a potential for deadlock and only those nodes which are potentially deadlocked perform the algorithm. | | | Bracha and S. Toueg, "A Distributed Algorithm for Generalized Deadlock Detection", Symposium on the Principles of Distributed Computing, October 1984, pp. |
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http://www.citidel.org/?op=getobj&identifier=oai:ACMDL:articles.18214
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| | AskTom "Reading deadlock trace files" |
| | I should have realised you were quoting data object ids when you were in the 200,000 range, rather than the logical object ids in the trace file. | | | One of the session (323 from the trace) is waiting on for a shared lock on this table. | | | The critical part is that we need to reproduce this and come up with a solution (changes to code) for the developers. |
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http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:1528515465282
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| | Berkeley DB Reference Guide: Deadlock detection |
| | 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). | | | If deadlock has occurred, a victim must be selected, and that victim will then return the error DB_LOCK_DEADLOCK from whatever Berkeley DB call it was making. | | | Transaction A cannot make forward progress until Transaction B releases its read lock on X, but Transaction B cannot make forward progress until Transaction A releases its read lock on X. In order to detect that deadlock has happened, a separate process or thread must review the locks currently held in the database. |
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http://www.sleepycat.com/docs/ref/transapp/deadlock.html
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| | Deadlock |
| | Technology is also in an advanced state of development in the Deadlock universe. | | | There are a few constraints that we need to work into our universe; firstly we have medieval technology and magic users. | | | Due to these factors, many levels of technological and magical development exist in the Deadlock universe. |
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http://renderlock.blogspot.com
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| | How can I avoiding deadlock? - dBforums |
| | 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. | | | The index locking situation has been improved with type 2 indexes, but old type 1 indexes must be explicitly converted on indexes previously created before version 8. |
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http://www.dbforums.com/showthread.php?t=798108&goto=nextnewest
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| | 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...) | | | Using this trace file you can find which objects caused the deadlock. | | | It will raise an ora-0060 error and also create a trace file. |
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http://www.experts-exchange.com/Databases/Oracle/Q_20274800.html
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| | The Old Joel on Software Forum - Deadlock |
| | A project I worked on followed this method and found several surprising potential deadlocks which we then fixed. | | | Also, before acquiring a lock, I checked to see whether the lock was already acquired by a thread which was blocked on a lock owned by this thread: and if so, I threw an exception (deadlock detection and recovery). | | | This approach will only make the deadlock less probable (and harder to find). |
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http://discuss.fogcreek.com/joelonsoftware?cmd=show&ixPost=143881
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| | [E-Lang] Deadlock-free [was what is good about E?] |
| | One of the threads is holding on to the lock around data A, while waiting for the lock around data B to become available. | | | Another thread is holding on to the lock around data B, while waiting for the lock around data A to become available. | | | Okay, so two threads are now permanently stopped, which is bad, but worse is that they will never release the locks around A and B. Thus *any* other thread that comes along and waits for either A *or* B will also become permanently stopped, adding any locks that it was holding to the "deadlock pileup". |
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http://www.eros-os.org/pipermail/e-lang/2001-July/005410.html
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| | Deadlock : Planetary Conquest |
| | The computer AI is ruthless at times, but is no match for human intelligence. | | | The interface is easy enough to understand and is intuitive to use. | | | But as I said, game play is the issue. |
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http://www.worldvillage.com/wv/gamezone/html/reviews/deadl.htm
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| | Starvation and Deadlock |
| | However, deadlock is always possible with this particular implementation of the | | | In other words, each is waiting for the chopstick on the left, which is held by the philosopher to the left. | | | Deadlock most often occurs when two (or more) threads are each waiting for the other(s) to do something. |
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http://java.sun.com/nav/read/Tutorial/java/threads/deadlock.html
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| | RE: Deadlock |
| | You can use sp_lock, while a deadlock is occuring. | | | table and correlate with when the deadlock actually occurs. | | | You can read up on deadlocks in BOL. |
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http://www.lazydba.com/sql/1__3958.html
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| | What is deadlock? - A Word Definition From the Webopedia Computer Dictionary |
| | Deadlocks occur most commonly in multitasking and client/server environments. | | | Ideally, the programs that are deadlocked, or the operating system, should resolve the deadlock, but this doesn't always happen. | | | A condition that occurs when two processes are each waiting for the other to complete before proceeding. |
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http://www.webopedia.com/TERM/D/deadlock.html
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| | Deadlock Detection |
| | In Operating Systems a special resource-allocation graph algorithm can be used to detect whether there is any deadlock in the system. | | | The input begins with a single positive integer on a line by itself indicating the number of the cases following, each of them as described below. | | | In case a deadlock is detected, the output must be ` |
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http://acm.uva.es/p/v8/840.html
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| | Define deadlock - a definition from Whatis.com |
| | A deadlock is a situation in which two computer programs sharing the same resource are effectively preventing each other from accessing the resource, resulting in both programs ceasing to function. | | | The earliest computer operating systems ran only one program at a time. | | | This led to the problem of the deadlock. |
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http://whatis.techtarget.com/definition/0,,sid9_gci211913,00.html
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| | MySQL Bugs: #8325: Deadlock in replication thread stops replication |
| | May be possible to design queries to increase likelihood of a deadlock in the replication thread by running many insert/updates on master and complex, long-running selects on slave (the instance it occurred in for me most recently involved a select currently holding >50 locks and a rapidly updating/inserting master across the same tables). | | | In that case, I would much prefer the replication transaction be chosen as the victim, and then retried automatically (via a SLAVE START) than have to redo the expensive read queries. | | | Chris, I had already decided to change 4.1.10 or 4.1.11 so that the replication thread is never chosen as the deadlock victim, and also, that the lock wait timeout is raised for the replication thread. |
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http://bugs.mysql.com/bug.php?id=8325
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| | Parallel Deadlock |
| | Notice how C's final blocking receive would be matched by a send on I if both instructions were executed. | | | However, it never gets executed because it is stuck in the blocking send to P (that has no matching receive on P), therefore causing deadlock on I. Miguel A. Revilla | | | A common problem in parallel computing is establishing proper communication patterns so that processors do not deadlock while either waiting to receive messages from other processors, or waiting for the sending of messages to other processors to complete. |
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http://acm.uva.es/p/v6/611.html
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| | deadlock from FOLDOC |
| | 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. | | | Nearby terms: dead « DEADBEEF « dead code « deadlock » deadly embrace » dead tree » dead tree edition |
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http://foldoc.org/foldoc/foldoc.cgi?deadlock
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| | sybase_deadlock_retry_count |
| | This function is only available using the CT library interface to Sybase, and not the DB library. | | | , the number of retries can be defined in cases of deadlocks. | | | By default, every deadlock is retried an infinite number of times or until the process is killed by Sybase, the executing script is killed (for instance, by |
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http://www.oxyscripts.com/manuals/php/function.sybase-deadlock-retry-count.html
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| | Citations: A generalized deadlock-free process calculus - Sumii, Kobayashi (ResearchIndex) |
| | His approach is quite dioeerent from ours, however: he uses a sophisticated type system where types involve time tags and where typing contexts record an ordering on the usage of names, whereas we only use a very simple information the set of receiver s.... | | | Another one is Warlock [15] a system for partial detection of race conditions and deadlocks in ANSI C programs. |
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http://citeseer.ist.psu.edu/context/967749/0
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| | Technorati Tag: deadlock |
| | After a little more research into the problem described in my earlier post I now have a better understanding of the problem. | | | Do You Have The Ratchet Deadlock Game In Stock? | | | Finding the lines of application code that are causing a deadlock can be quite a challenge. |
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http://www.technorati.com/tag/deadlock
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| | deadlock |
| | A common example is a program communicating to a server, which may find itself waiting for output from the server before sending anything more to it, while the server is similarly waiting for more input from the controlling program before outputting anything. | | | (It is reported that this particular flavor 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. | | | Another common flavor is `constipation', in which each process is trying to send stuff to the other but all buffers are full because nobody is reading anything.) See deadly embrace. |
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http://www.antionline.com/jargon/deadlock.php
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| | RE: Analyze Deadlock situation in SQL Server 2000 |
| | Are you able to see what SQL query that causes the Deadlock and which two | | | deadlock appears when we execute a method from java using multiple threads. | | | occurring(basically for what DML the deadlock is occuring) |
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http://www.lazydba.com/oracle/0__45196.html
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| | Program Hangs Because of Deadlock in Ntdll |
| | This problem is most likely to occur on computers with multiple processors. | | | There is a problem with the heap and critical section initialization that can cause a deadlock in Ntdll. | | | To resolve this problem, obtain the latest service pack for Windows 2000. |
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http://support.microsoft.com/?kbid=271182
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| | [No title] |
| | Uh-huh..." replied DeadLock between the simultaneous replies from the other two. | | | Windigo and DeadLock followed after, walking in step to Hanover and humming 'Pinky and the Brain' under their breaths. | | | Thought to ask him why he isn't doing this himself?" DeadLock closed the space between them and gave Hanover a little push. |
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http://www.jihad.net/pacifica/rootpac24.txt
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| | The Adrenaline Vault GNO Deadlock |
| | The strategies presented herein are employed with this in mind. | | | I should tell you that my approach to winning Deadlock is always to destroy all of the enemy forces. | | | There may even be some cheat codes or something that Accolade hasn't told us about yet. |
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http://avault.com/cheats/getcheat.asp?game=deadlock
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| | Public Beta: TMultiReadExclusiveWriteSynchronizer update for Delphi 6 |
| | Abstract: This beta consists of an updated implementation for the TMultiReadExclusiveWriteSynchronizer in SysUtils.pas to fix a possible deadlock issue. | | | This updated SysUtils.pas file fixes a deadlock issue that can occur in the TMultiReadExclusiveWriteSynchronizer. | | | This is specifically why we have made this file available for our customers to download. |
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http://community.borland.com/article/0,1410,28599,00.html
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| | Deadlock 2 (PC) Test und Preisvergleich |
| | Vergleichen Sie ähnliche Produkte mit Deadlock 2 (PC) | | | Home > Games & Toys > Computerspiele > PC Spiele-Archiv > D > Deadlock 2 (PC) | | | Einige CDs waren schon zur Seite gelegt, und sollten eigentlich installiert werden, was jedoch sofort in Vergessenheit geriet, als ich die Deadlock II – CD wiederfand. |
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http://www.ciao.de/Deadlock_2_PC__193888
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| | Art Of Business Web Site Promotion |
| | Killer software titles for search engine preparation, submission and monitoring. | | | 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. | | | given out over the years by deadlock disciples, or post a question of your own to get help from other webmasters like yourself. |
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http://www.deadlock.com/promote
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| | Deadlock threatens Timor Sea oil deal. 27/10/2004. ABC News Online |
| | What we propose is a creative solution,'' he said. | | | A multi-billion dollar project to develop oil and gas in the Timor Sea is in danger of collapse, with a new deadlock in talks between Australia and East Timor. | | | A multi-billion dollar project to develop oil and gas in the Timor Sea looks close to collapse, with a new deadlock in talks between Australia and East Timor. |
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http://www.abc.net.au/news/newsitems/200410/s1229293.htm
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| | Deadlocks: Chapter 7 |
| | Restrain the ways that processes can make resource requests: | | | if there are several instances per resource type, then we have the possibility of deadlock. | | | Mutual exclusion: only one process at a time can use a resource. |
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http://data.uta.edu/~ramesh/cse3320/chap7.html
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| | ZFX - Algorithmen und Datenstrukturen - Re: Deadlock |
| | Ich habe das grad mal mit meiner Schwester ausprobiert, gab keine Probleme. | | | Hi, mein Problem war die erkennung eines Deadlocks, um es dann zu lösen könnte man sich zur not aneinander vorbeiquetschen -> der jenige der das Problem erkennt macht sich dünn | | | Ein Deadlock ist vorhanden, wenn es einen Zyklus im Ressourcen-Allokationsgraphen gibt und die Ressourcen jeweils nur einfach vorliegen. |
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http://www.zfx.info/DisplayThread.php?MID=182519
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| | FilePlanet: Deadlock |
| | This is a playable demo of Deadlock, a new strategy game by Accolade. | | | Home / Gaming / Strategy / Real-Time / Deadlock / Demos |
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http://www.fileplanet.com/11433/10000/fileinfo/Deadlock
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| | Deadlock - Bedeutung, Definition, Erklärung im netlexikon |
| | On Deadlocks in Concurrent Systems: A Petri Net Based Approach for Deadlock Prediction and Avoidance von Ndombe Cacutalua (Broschiert) | | | Deadlock von Sara Paretsky, Rowena Akinyemi (Sondereinband) für EUR 8,00 | | | Deadlock von Sara Paretsky, Katja Münch (Broschiert) für EUR 7,95 |
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http://www.lexikon-definition.de/Deadlock.html
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| | Deadlock |
| | Do not allow requests that would make it possible to deadlock the system. | | | Deadlock occurs when two or more processes are prevented from going forward. | | | Remove one of the four necessary conditions from the system. |
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http://www.eecs.utoledo.edu/~jheuring/EECS2550/Overheads/June08.html
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| | GameSpy: Deadlock |
| | See the latest trends in game development from the front lines! | | | The basic gameplay will be familiar to anyone who's ever played a simulation game such as SimCity or Civilization. | | | Deadlock simply takes the city's development and transports it into outer space. |
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http://pc.gamespy.com/pc/deadlock
(187 words)
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| | Web Site Promotion Services, by deadlock Design |
| | The deadlock Design principle is simple: we're here to help you to help yourself. | | | deadlock Design can handle everything for you: we can build your site (including promotion elements as we go along), we can promote it, and we can add sophisticated interactive systems if that's your pleasure. | | | Or you can chat to other webmasters via our Message Board. |
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http://www.deadlock.com
(406 words)
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