StackOverflow2013

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PO
primarykey
Id
16149802
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0
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2013-04-22T14:36:25.390
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2013-04-22T14:42:45.490
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2013-04-22T14:42:45.490
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1827903
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1827903
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16149430
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2
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0
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text
Body
Go with 2a) Let each thread acquire all of the locks that it needs (NOT all of the locks) in a particular order; if a thread encounters a lock that isn't available then it releases all of its locks As long as threads acquire their locks in the same order you can't have deadlock; however, you can still have starvation (a thread might run into a situation where it keeps releasing all of its locks without making forward progress). To ensure that progress is made you can assign priorities to threads (0 = lowest priority, MAX_INT = highest priority) - increase a thread's priority when it has to release its locks, and reduce it to 0 when it acquires all of its locks. Put your waiting threads in a queue, and don't start a lower-priority thread if it needs the same resources as a higher-priority thread - this way you guarantee that the higher-priority threads will eventually acquire all of their locks. Don't implement this thread queue unless you're actually having problems with thread starvation, though, because it's probably less efficient than just letting all of your threads run at once. You can also simplify things by implementing omer schleifer's condense-all-locks-to-one solution; however, unless threads other than the four you've mentioned are contending for these resources (in which case you'll still need to lock the resources from the external threads), you can more efficiently implement this by removing all locks and putting your threads in a circular queue (so your threads just keep running in the same order).
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1. This table or related slice is empty.
PostParentId
1. POJava Thread Live Lock
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PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USZim-Zam O'Pootertoot
UserOwnerUserId
1. USZim-Zam O'Pootertoot
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