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• evaluation of a java thread dump

  - by raticulin

  I got a thread dump of one of my processes. It has a bunch of these threads. I guess they are keeping a bunch of memory so I am getting OOM. "Thread-8264" prio=6 tid=0x4c94ac00 nid=0xf3c runnable [0x4fe7f000] java.lang.Thread.State: RUNNABLE at java.util.zip.Inflater.inflateBytes(Native Method) at java.util.zip.Inflater.inflate(Inflater.java:223) - locked <0x0c9bc640 (a java.util.zip.Inflater) at org.apache.commons.compress.archivers.zip.ZipArchiveInputStream.read(ZipArchiveInputStream.java:235) at com.my.ZipExtractorCommonsCompress.extract(ZipExtractorCommonsCompress.java:48) at com.my.CustomThreadedExtractorWrapper$ExtractionThread.run(CustomThreadedExtractorWrapper.java:151) Locked ownable synchronizers: - None "Thread-8241" prio=6 tid=0x4c94a400 nid=0xb8c runnable [0x4faef000] java.lang.Thread.State: RUNNABLE at java.util.zip.Inflater.inflateBytes(Native Method) at java.util.zip.Inflater.inflate(Inflater.java:223) - locked <0x0c36b808 (a java.util.zip.Inflater) at org.apache.commons.compress.archivers.zip.ZipArchiveInputStream.read(ZipArchiveInputStream.java:235) at com.my.ZipExtractorCommonsCompress.extract(ZipExtractorCommonsCompress.java:48) at com.my.CustomThreadedExtractorWrapper$ExtractionThread.run(CustomThreadedExtractorWrapper.java:151) Locked ownable synchronizers: - None I am trying to find out how it arrived to this situation. CustomThreadedExtractorWrapper is a wrapper class that fires a thread to do some work (ExtractionThread, which uses ZipExtractorCommonsCompress to extract zip contents from a compressed stream). If the task is taking too long, ExtractionThread.interrupt(); is called to cancel the operation. I can see in my logs that the cancellation happened 25 times. And I see 21 of these threads in my dump. My questions: What is the status of these threads? Alive and running? Blocked somehow? They did not die with .interrupt() apparently? Is there a sure way to really kill a thread? What does really mean 'locked ' in the stack trace? Line 223 in Inflater.java is: public synchronized int inflate(byte[] b, int off, int len) { ... //return is line 223 return inflateBytes(b, off, len); }

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• Thread Safety of C# List<T> for readers

  - by ILIA BROUDNO

  I am planning to create the list once in a static constructor and then have multiple instances of that class read it (and enumerate through it) concurrently without doing any locking. In this article http://msdn.microsoft.com/en-us/library/6sh2ey19.aspx MS describes the issue of thread safety as follows: Public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe. A List can support multiple readers concurrently, as long as the collection is not modified. Enumerating through a collection is intrinsically not a thread-safe procedure. In the rare case where an enumeration contends with one or more write accesses, the only way to ensure thread safety is to lock the collection during the entire enumeration. To allow the collection to be accessed by multiple threads for reading and writing, you must implement your own synchronization. The "Enumerating through a collection is intrinsically not a thread-safe procedure." Statement is what worries me. Does this mean that it is thread safe for readers only scenario, but as long as you do not use enumeration? Or is it safe for my scenario?

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• java - question about thread abortion and deadlock - volatile keyword

  - by Tiyoal

  Hello all, I am having some troubles to understand how I have to stop a running thread. I'll try to explain it by example. Assume the following class: public class MyThread extends Thread { protected volatile boolean running = true; public void run() { while (running) { synchronized (someObject) { while (someObject.someCondition() == false && running) { try { someObject.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } // do something useful with someObject } } } public void halt() { running = false; interrupt(); } } Assume the thread is running and the following statement is evaluated to true: while (someObject.someCondition() == false && running) Then, another thread calls MyThread.halt(). Eventhough this function sets 'running' to false (which is a volatile boolean) and interrupts the thread, the following statement is still executed: someObject.wait(); We have a deadlock. The thread will never be halted. Then I came up with this, but I am not sure if it is correct: public class MyThread extends Thread { protected volatile boolean running = true; public void run() { while (running) { synchronized (someObject) { while (someObject.someCondition() == false && running) { try { someObject.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } // do something useful with someObject } } } public void halt() { running = false; synchronized(someObject) { interrupt(); } } } Is this correct? Is this the most common way to do this? This seems like an obvious question, but I fail to come up with a solution. Thanks a lot for your help.

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• SQL SERVER Find Max Worker Count using DMV 32 Bit and 64 Bit

  During several recent training courses, I found it very interesting that Worker Thread is not quite known to everyone despite the fact that it is a very important feature. At some point in the discussion, one of the attendees mentioned that we can double the Worker Thread if we double the CPU (add the same [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Is SecureRandom thread safe?

  - by Yishai

  Is SecureRandom thread safe? That is, after initializing it, can access to the next random number be relied on to be thread safe? Examining the source code seems to show that it is, and this bug report seems to indicate that its lack of documentation as thread safe is a javadoc issue. Has anyone confirmed that it is in fact thread safe?

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• How a thread should close itself in Java?

  - by Roman

  This is a short question. At some point my thread understand that it should suicide. What is the best way to do it: Thread.currentThread().interrupt(); return; By the way, why in the first case we need to use currentThread? Is Thread does not refer to the current thread?

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• .NET threading: how can I capture an abort on an unstarted thread?

  - by Groxx

  I have a chunk of threads I wish to run in order, on an ASP site running .NET 2.0 with Visual Studio 2008 (no idea how much all that matters, but there it is), and they may have aborted-clean-up code which should be run regardless of how far through their task they are. So I make a thread like this: Thread t = new Thread(delegate() { try { /* do things */ System.Diagnostics.Debug.WriteLine("try"); } catch (ThreadAbortException) { /* cleanup */ System.Diagnostics.Debug.WriteLine("catch"); } }); Now, if I wish to abort the set of threads part way through, the cleanup may still be desirable later on down the line. Looking through MSDN implies you can .Abort() a thread that has not started, and then .Start() it, at which point it will receive the exception and perform normally. Or you can .Join() the aborted thread to wait for it to finish aborting. Presumably you can combine them. http://msdn.microsoft.com/en-us/library/ty8d3wta(v=VS.80).aspx To wait until a thread has aborted, you can call the Join method on the thread after calling the Abort method, but there is no guarantee the wait will end. If Abort is called on a thread that has not been started, the thread will abort when Start is called. If Abort is called on a thread that is blocked or is sleeping, the thread is interrupted and then aborted. Now, when I debug and step through this code: t.Abort(); // ThreadState == Unstarted | AbortRequested t.Start(); // throws ThreadStartException: "Thread failed to start." // so I comment it out, and t.Join(); // throws ThreadStateException: "Thread has not been started." At no point do I see any output, nor do any breakpoints on either the try or catch block get reached. Oddly, ThreadStartException is not listed as a possible throw of .Start(), from here: http://msdn.microsoft.com/en-us/library/a9fyxz7d(v=VS.80).aspx (or any other version) I understand this could be avoided by having a start parameter, which states if the thread should jump to cleanup code, and foregoing the Abort call (which is probably what I'll do). And I could .Start() the thread, and then .Abort() it. But as an indeterminate amount of time may pass between .Start and .Abort, I'm considering it unreliable, and the documentation seems to say my original method should work. Am I missing something? Is the documentation wrong? edit: ow. And you can't call .Start(param) on a non-parameterized Thread(Start). Is there a way to find out if a thread is parameterized or not, aside from trial and error? I see a private m_Delegate, but nothing public...

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• H12 timeout error on Heroku

  - by snowangel

  Can anyone shed some light on what's causing this timeout error on Heroku (at 2012-07-08T08:58:33+00:00)? The docs say that it's because of some long running process. I've set config.assets.initialize_on_precompile = false in config/application.rb. EmBP-2:bc Emma$ heroku restart Restarting processes... done EmBP-2:bc Emma$ heroku logs --tail 2012-07-08T08:47:21+00:00 heroku[nginx]: 82.69.50.215 - - [08/Jul/2012:08:47:21 +0000] "GET /assets/application.js HTTP/1.1" 200 311723 "https://codicology.co.uk/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/534.52.7 (KHTML, like Gecko) Version/5.1.2 Safari/534.52.7" codicology.co.uk 2012-07-08T08:47:21+00:00 heroku[nginx]: 127.0.0.1 - - [08/Jul/2012:08:47:21 +0000] "GET /assets/application.js HTTP/1.0" 200 1311615 "https://codicology.co.uk/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/534.52.7 (KHTML, like Gecko) Version/5.1.2 Safari/534.52.7" codicology.co.uk 2012-07-08T08:51:32+00:00 heroku[slugc]: Slug compilation started 2012-07-08T08:54:05+00:00 heroku[api]: Release v145 created by [email protected] 2012-07-08T08:54:05+00:00 heroku[api]: Deploy 8814b2f by [email protected] 2012-07-08T08:54:05+00:00 heroku[web.1]: State changed from up to starting 2012-07-08T08:54:06+00:00 heroku[slugc]: Slug compilation finished 2012-07-08T08:54:09+00:00 heroku[web.1]: Stopping all processes with SIGTERM 2012-07-08T08:54:09+00:00 heroku[worker.1]: Stopping all processes with SIGTERM 2012-07-08T08:54:09+00:00 heroku[web.1]: Starting process with command `bundle exec unicorn -p 22429 -c ./config/unicorn.rb` 2012-07-08T08:54:10+00:00 app[worker.1]: [Worker(host:2046e0bf-e109-40f2-abdb-10f69d224483 pid:1)] Exiting... 2012-07-08T08:54:11+00:00 app[web.1]: I, [2012-07-08T08:54:11.320616 #1] INFO -- : reaped #<Process::Status: pid 8 exit 0> worker=1 2012-07-08T08:54:11+00:00 app[web.1]: I, [2012-07-08T08:54:11.376765 #1] INFO -- : master complete 2012-07-08T08:54:11+00:00 app[web.1]: I, [2012-07-08T08:54:11.376272 #1] INFO -- : reaped #<Process::Status: pid 5 exit 0> worker=0 2012-07-08T08:54:12+00:00 app[web.1]: I, [2012-07-08T08:54:12.011695 #1] INFO -- : worker=0 spawning... 2012-07-08T08:54:12+00:00 app[web.1]: I, [2012-07-08T08:54:12.011386 #1] INFO -- : listening on addr=0.0.0.0:22429 fd=3 2012-07-08T08:54:12+00:00 app[web.1]: I, [2012-07-08T08:54:12.017917 #5] INFO -- : worker=0 spawned pid=5 2012-07-08T08:54:12+00:00 app[web.1]: I, [2012-07-08T08:54:12.019309 #1] INFO -- : master process ready 2012-07-08T08:54:12+00:00 app[web.1]: I, [2012-07-08T08:54:12.018250 #5] INFO -- : Refreshing Gem list 2012-07-08T08:54:12+00:00 app[web.1]: I, [2012-07-08T08:54:12.016768 #1] INFO -- : worker=1 spawning... 2012-07-08T08:54:12+00:00 app[web.1]: I, [2012-07-08T08:54:12.020863 #8] INFO -- : Refreshing Gem list 2012-07-08T08:54:12+00:00 app[web.1]: I, [2012-07-08T08:54:12.020617 #8] INFO -- : worker=1 spawned pid=8 2012-07-08T08:54:12+00:00 app[worker.1]: SQL (2.9ms) UPDATE "delayed_jobs" SET locked_by = null, locked_at = null WHERE (locked_by = 'host:2046e0bf-e109-40f2-abdb-10f69d224483 pid:1') 2012-07-08T08:54:12+00:00 heroku[web.1]: Process exited with status 0 2012-07-08T08:54:13+00:00 heroku[web.1]: State changed from starting to up 2012-07-08T08:54:14+00:00 heroku[worker.1]: Process exited with status 0 2012-07-08T08:54:14+00:00 heroku[worker.1]: State changed from up to down 2012-07-08T08:54:14+00:00 heroku[worker.1]: State changed from down to starting 2012-07-08T08:54:20+00:00 heroku[worker.1]: Starting process with command `bundle exec rake jobs:work` 2012-07-08T08:54:20+00:00 heroku[worker.1]: State changed from starting to up 2012-07-08T08:54:28+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:6) 2012-07-08T08:54:28+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:6) 2012-07-08T08:54:28+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:6) 2012-07-08T08:54:28+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:6) 2012-07-08T08:54:33+00:00 app[web.1]: Starting the New Relic Agent. 2012-07-08T08:54:33+00:00 app[web.1]: Starting the New Relic Agent. 2012-07-08T08:54:33+00:00 app[web.1]: Installed New Relic Browser Monitoring middleware 2012-07-08T08:54:33+00:00 app[web.1]: Installed New Relic Browser Monitoring middleware 2012-07-08T08:54:34+00:00 app[web.1]: 2012-07-08T08:54:34+00:00 app[web.1]: 2012-07-08T08:54:34+00:00 app[web.1]: [DEVISE] Devise.use_salt_as_remember_token is deprecated and has no effect. Please remove it. 2012-07-08T08:54:34+00:00 app[web.1]: 2012-07-08T08:54:34+00:00 app[web.1]: [DEVISE] Devise.use_salt_as_remember_token is deprecated and has no effect. Please remove it. 2012-07-08T08:54:34+00:00 app[web.1]: 2012-07-08T08:54:34+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant XLSX 2012-07-08T08:54:34+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant PDF 2012-07-08T08:54:34+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant PDF 2012-07-08T08:54:34+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant XLSX 2012-07-08T08:54:34+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant PDF 2012-07-08T08:54:34+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant PDF 2012-07-08T08:54:41+00:00 app[worker.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/Rakefile:10) 2012-07-08T08:54:41+00:00 app[worker.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/Rakefile:10) 2012-07-08T08:54:45+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importadvancecsv class 2012-07-08T08:54:45+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importpaymentcsv class 2012-07-08T08:54:45+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importpurchasecsv class 2012-07-08T08:54:45+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importadvancecsv class 2012-07-08T08:54:45+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importpaymentcsv class 2012-07-08T08:54:45+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importpurchasecsv class 2012-07-08T08:54:45+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importsalecsv class 2012-07-08T08:54:46+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Profitarchive class 2012-07-08T08:54:46+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importsalecsv class 2012-07-08T08:54:46+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Profitarchive class 2012-07-08T08:54:46+00:00 app[web.1]: [paperclip] Duplicate URL for xml with :s3_eu_url. This will clash with attachment defined in Onixarchive class 2012-07-08T08:54:47+00:00 app[web.1]: [paperclip] Duplicate URL for xml with :s3_eu_url. This will clash with attachment defined in Onixarchive class 2012-07-08T08:54:48+00:00 app[web.1]: I, [2012-07-08T08:54:48.467693 #8] INFO -- : worker=1 ready 2012-07-08T08:54:48+00:00 app[web.1]: I, [2012-07-08T08:54:48.823800 #5] INFO -- : worker=0 ready 2012-07-08T08:54:48+00:00 app[worker.1]: Starting the New Relic Agent. 2012-07-08T08:54:48+00:00 app[worker.1]: New Relic Agent not running. 2012-07-08T08:54:48+00:00 app[worker.1]: [Worker(host:1eabe514-7ec9-43b0-835b-ff3bd23bc266 pid:1)] New Relic Ruby Agent Monitoring DJ worker host:1eabe514-7ec9-43b0-835b-ff3bd23bc266 pid:1 2012-07-08T08:54:48+00:00 app[worker.1]: Installed New Relic Browser Monitoring middleware 2012-07-08T08:54:49+00:00 app[worker.1]: [Worker(host:1eabe514-7ec9-43b0-835b-ff3bd23bc266 pid:1)] Starting job worker 2012-07-08T08:57:54+00:00 heroku[web.1]: State changed from up to starting 2012-07-08T08:57:56+00:00 heroku[web.1]: Stopping all processes with SIGTERM 2012-07-08T08:57:57+00:00 app[web.1]: I, [2012-07-08T08:57:57.047386 #1] INFO -- : reaped #<Process::Status: pid 5 exit 0> worker=0 2012-07-08T08:57:57+00:00 app[web.1]: I, [2012-07-08T08:57:57.047753 #1] INFO -- : reaped #<Process::Status: pid 8 exit 0> worker=1 2012-07-08T08:57:57+00:00 app[web.1]: I, [2012-07-08T08:57:57.047999 #1] INFO -- : master complete 2012-07-08T08:57:57+00:00 heroku[worker.1]: Stopping all processes with SIGTERM 2012-07-08T08:57:58+00:00 heroku[web.1]: Process exited with status 0 2012-07-08T08:57:58+00:00 app[worker.1]: [Worker(host:1eabe514-7ec9-43b0-835b-ff3bd23bc266 pid:1)] Exiting... 2012-07-08T08:57:59+00:00 heroku[web.1]: Starting process with command `bundle exec unicorn -p 29766 -c ./config/unicorn.rb` 2012-07-08T08:58:01+00:00 app[worker.1]: SQL (27.9ms) UPDATE "delayed_jobs" SET locked_by = null, locked_at = null WHERE (locked_by = 'host:1eabe514-7ec9-43b0-835b-ff3bd23bc266 pid:1') 2012-07-08T08:58:02+00:00 app[web.1]: I, [2012-07-08T08:58:02.070527 #1] INFO -- : listening on addr=0.0.0.0:29766 fd=3 2012-07-08T08:58:02+00:00 app[web.1]: I, [2012-07-08T08:58:02.070782 #1] INFO -- : worker=0 spawning... 2012-07-08T08:58:02+00:00 app[web.1]: I, [2012-07-08T08:58:02.074498 #1] INFO -- : worker=1 spawning... 2012-07-08T08:58:02+00:00 app[web.1]: I, [2012-07-08T08:58:02.075702 #1] INFO -- : master process ready 2012-07-08T08:58:02+00:00 app[web.1]: I, [2012-07-08T08:58:02.076732 #5] INFO -- : worker=0 spawned pid=5 2012-07-08T08:58:02+00:00 app[web.1]: I, [2012-07-08T08:58:02.076957 #5] INFO -- : Refreshing Gem list 2012-07-08T08:58:02+00:00 app[web.1]: I, [2012-07-08T08:58:02.089022 #8] INFO -- : worker=1 spawned pid=8 2012-07-08T08:58:02+00:00 app[web.1]: I, [2012-07-08T08:58:02.089299 #8] INFO -- : Refreshing Gem list 2012-07-08T08:58:02+00:00 heroku[worker.1]: Process exited with status 0 2012-07-08T08:58:02+00:00 heroku[worker.1]: State changed from up to down 2012-07-08T08:58:02+00:00 heroku[worker.1]: State changed from down to starting 2012-07-08T08:58:02+00:00 heroku[web.1]: State changed from starting to up 2012-07-08T08:58:10+00:00 heroku[worker.1]: Starting process with command `bundle exec rake jobs:work` 2012-07-08T08:58:11+00:00 heroku[worker.1]: State changed from starting to up 2012-07-08T08:58:28+00:00 app[worker.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/Rakefile:10) 2012-07-08T08:58:28+00:00 app[worker.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/Rakefile:10) 2012-07-08T08:58:33+00:00 heroku[router]: Error H12 (Request timeout) -> GET codicology.co.uk/ dyno=web.1 queue= wait= service=30000ms status=503 bytes=0 2012-07-08T08:58:33+00:00 heroku[nginx]: 127.0.0.1 - - [08/Jul/2012:08:58:33 +0000] "GET / HTTP/1.0" 503 601 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/534.52.7 (KHTML, like Gecko) Version/5.1.2 Safari/534.52.7" codicology.co.uk 2012-07-08T08:58:33+00:00 heroku[nginx]: 82.69.50.215 - - [08/Jul/2012:08:58:33 +0000] "GET / HTTP/1.1" 503 601 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/534.52.7 (KHTML, like Gecko) Version/5.1.2 Safari/534.52.7" codicology.co.uk 2012-07-08T08:58:42+00:00 app[worker.1]: New Relic Agent not running. 2012-07-08T08:58:42+00:00 app[worker.1]: [Worker(host:b5fa9243-6f9b-4de4-8f64-adab767fe4b0 pid:1)] New Relic Ruby Agent Monitoring DJ worker host:b5fa9243-6f9b-4de4-8f64-adab767fe4b0 pid:1 2012-07-08T08:58:42+00:00 app[worker.1]: Starting the New Relic Agent. 2012-07-08T08:58:42+00:00 app[worker.1]: Installed New Relic Browser Monitoring middleware 2012-07-08T08:58:43+00:00 app[worker.1]: [Worker(host:b5fa9243-6f9b-4de4-8f64-adab767fe4b0 pid:1)] Starting job worker 2012-07-08T08:58:56+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:6) 2012-07-08T08:58:56+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:6) 2012-07-08T08:58:56+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:6) 2012-07-08T08:58:56+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:6) 2012-07-08T08:59:02+00:00 app[web.1]: Starting the New Relic Agent. 2012-07-08T08:59:02+00:00 app[web.1]: Installed New Relic Browser Monitoring middleware 2012-07-08T08:59:02+00:00 app[web.1]: Starting the New Relic Agent. 2012-07-08T08:59:02+00:00 app[web.1]: Installed New Relic Browser Monitoring middleware 2012-07-08T08:59:03+00:00 app[web.1]: 2012-07-08T08:59:03+00:00 app[web.1]: [DEVISE] Devise.use_salt_as_remember_token is deprecated and has no effect. Please remove it. 2012-07-08T08:59:03+00:00 app[web.1]: 2012-07-08T08:59:03+00:00 app[web.1]: 2012-07-08T08:59:03+00:00 app[web.1]: [DEVISE] Devise.use_salt_as_remember_token is deprecated and has no effect. Please remove it. 2012-07-08T08:59:03+00:00 app[web.1]: 2012-07-08T08:59:04+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant XLSX 2012-07-08T08:59:04+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant PDF 2012-07-08T08:59:04+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant PDF 2012-07-08T08:59:04+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant XLSX 2012-07-08T08:59:04+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant PDF 2012-07-08T08:59:04+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant PDF 2012-07-08T08:59:22+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importadvancecsv class 2012-07-08T08:59:22+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importpaymentcsv class 2012-07-08T08:59:22+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importpurchasecsv class 2012-07-08T08:59:22+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importsalecsv class 2012-07-08T08:59:22+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Profitarchive class 2012-07-08T08:59:23+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importadvancecsv class 2012-07-08T08:59:23+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importpaymentcsv class 2012-07-08T08:59:23+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importpurchasecsv class 2012-07-08T08:59:23+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importsalecsv class 2012-07-08T08:59:23+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Profitarchive class 2012-07-08T08:59:23+00:00 app[web.1]: [paperclip] Duplicate URL for xml with :s3_eu_url. This will clash with attachment defined in Onixarchive class 2012-07-08T08:59:24+00:00 app[web.1]: [paperclip] Duplicate URL for xml with :s3_eu_url. This will clash with attachment defined in Onixarchive class 2012-07-08T08:59:25+00:00 app[web.1]: I, [2012-07-08T08:59:25.555052 #5] INFO -- : worker=0 ready 2012-07-08T08:59:25+00:00 app[web.1]: 2012-07-08T08:59:25+00:00 app[web.1]: 2012-07-08T08:59:25+00:00 app[web.1]: Started GET "/" for 82.69.50.215 at 2012-07-08 08:59:25 +0000 2012-07-08T08:59:26+00:00 app[web.1]: Processing by PagesController#home as HTML 2012-07-08T08:59:26+00:00 app[web.1]: I, [2012-07-08T08:59:26.043501 #8] INFO -- : worker=1 ready 2012-07-08T08:59:26+00:00 app[web.1]: Rendered pages/home.html.haml within layouts/application (5.7ms) 2012-07-08T08:59:26+00:00 app[web.1]: (1.1ms) SELECT COUNT(*) FROM "delayed_jobs" 2012-07-08T08:59:26+00:00 app[web.1]: Rendered layouts/_header.html.erb (4.2ms) 2012-07-08T08:59:26+00:00 app[web.1]: Rendered layouts/_footer.html.haml (1.4ms) 2012-07-08T08:59:26+00:00 app[web.1]: Completed 200 OK in 326ms (Views: 258.4ms | ActiveRecord: 65.2ms)

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• System.Timers.Timer/Threading.Timer vs Thread with WhileLoop + Thread.Sleep For Periodic Tasks

  - by Alan

  In my application I have to send periodic heartbeats to a "brother" application. Is this better accomplished with System.Timers.Timer/Threading.Timer or Using a Thread with a while loop and a Thread.Sleep? The heartbeat interval is 1 second. while(!exit) { //do work Thread.Sleep(1000); } or myTimer.Start( () => { //do work }, 1000); //pseudo code (not actual syntax)...

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• Worker process reached its allowed processing time

  - by Confused

  We are experiencing this issue approximately once a month. It is very hard to pinpoint the cause so any help would be appreciated. This causes the App pool to stop and brings the site down. We have gone through all log files and have concluded nothing. We are using the 2.0.3 version on IIS 6.

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• C# thread with multiple parameters

  - by Lucas B

  Does anyone know how to pass multiple parameters into a Thread.Start routine? I thought of extending the class, but the C# Thread class is sealed. Here is what I think the code would look like: ... Thread standardTCPServerThread = new Thread(startSocketServerAsThread); standardServerThread.Start( orchestrator, initializeMemberBalance, arg, 60000); ... } static void startSocketServerAsThread(ServiceOrchestrator orchestrator, List<int> memberBalances, string arg, int port) { startSocketServer(orchestrator, memberBalances, arg, port); } Thank you in advance. BTW, I start a number of threads with different orchestrators, balances and ports. Please consider thread safety also.

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• Using EnterCriticalSection in Thread to update VCL label

  - by user257188

  I'm new to threads. I'm using a 3rd party library that uses threads which at times call a procedure I've provided. How do I update update a TLabel.Caption from my procedure when its called by the thread? If I've called InitializeCriticalSection elsewhere, is it as simple as EnterCriticalSection(CritSect); GlobalVariable := 'New TLabel.Caption'; LeaveCriticalSection(CritSect); And then in my main thread: EnterCriticalSection(CritSect); Label1.Caption:= 'New TLable.Caption'; LeaveCriticalSection(CritSect); But, how do I get the main thread code to be called? The thread can use SendMessage? Or is there some better/easier way (.OnIdle could check a flag set by the thread?) Thanks.

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• Make process run on non EDT (event dispatch thread) thread from EDT

  - by Aly

  I have a method running on the EDT and within that I want to make it execute something on a new (non EDT) thread. My current code is follows: @Override public void actionPerformed(ActionEvent arg0) { //gathering parameters from GUI //below code I want to run in new Thread and then kill this thread/(close the JFrame) new GameInitializer(userName, player, Constants.BLIND_STRUCTURE_FILES.get(blindStructure), handState); }

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• Thread local storage with __declspec(thread) fails in C++/CLI

  - by EFrank

  I'm working on a project where we mix .NET code and native C++ code via a C++/CLI layer. In this solution I want to use Thread Local Storage via the __declspec(thread) declaration: __declspec(thread) int lastId = 0; However, at the first access of the variable, I get a NullReferenceException. To be more precise, the declaration is done within a ref class (a .NET class implemented in C++/CLI). I have already read something about __declspec(thread) does not work with delay loaded DLLs. Am I using delay loaded DLLs automatically if I use .NET?

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• VB.NET 2.0 - StackOverflowException when using Thread Safe calls to Windows Forms Controls

  - by LamdaComplex

  I have a Windows Forms app that, unfortunately, must make calls to controls from a second thread. I've been using the thread-safe pattern described on the http://msdn.microsoft.com/en-us/library/ms171728.aspx. Which has worked great in the past. The specific problem I am having now: I have a WebBrowser control and I'm attempting to invoke the WebBrowser.Navigate() method using this Thread-Safe pattern and as a result I am getting StackOverflow exceptions. Here is the Thread-Safe Navigate method I've written. Private Delegate Sub NavigateControlCallback(ByRef wb As WebBrowser, ByVal url As String) Private Sub AsyncNavigate(ByRef wb As WebBrowser, ByVal URL As String) Try If wb.InvokeRequired Then Dim callback As New NavigateControlCallback(AddressOf AsyncNavigate) callback(wb, url) Else wb.Navigate(url) End If Catch ex As Exception End Try End Sub Is there a Thread-Safe way to interact with WinForms components without the side effect of these StackOverflowExceptions?

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• Thread Local Memory for Scratch Memory.

  - by Hassan Syed

  I am using Protocol Buffers and OpensSSL to generate, HMACs and then CBC encrypt the two fields to obfuscate the session cookies -- similar Kerberos tokens. Protocol Buffers' API communicates with std::strings and has a buffer caching mechanism; I exploit the caching mechanism, for successive calls in the the same thread, by placing it in thread local memory; additionally the OpenSSL HMAC and EVP CTX's are also placed in the same thread local memory structure ( see this question for some detail on why I use thread local memory and the massive amount of speedup it enables even with a single thread). The generation and deserialization, "my algorithms", of these cookie strings uses intermediary void *s and std::strings and since Protocol Buffers has an internal memory retention mechanism I want these characteristics for "my algorithms". So how do I implement a common scratch memory ? I don't know much about the rdbuf of the std::string object. I would presumeably need to grow it to the lowest common size ever encountered during the execution of "my algorithms". Thoughts ?

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• C++ boost thread id and Singleton

  - by aaa

  hi. Sorry to flood so many questions this week. I assume thread index returned by thread.get_id is implementation specific. In case of the pthreads, is index reused? IE, if thread 0 runs and joins, is thread launched afterwords going to have a different ID? the reason I ask this is a need to implement Singleton pattern with a twist: each thread gets its own instance. I know it sounds very crazy, but threads control hardware (cuda) which does not permit device memory sharing. What is a good way to implement such pattern?

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• Pass off execution to different/specific thread in Java

  - by Mike

  I have about 4 threads. One thread keeps checking some data that the other thread is updating. The others are doing some processing in the background. All have been started at this point. My question is when the checking thread sees that the data has not been updated yet I currently sleep for a little bit but is there any way for me to tell the system to back to executing the thread that does the updating? That or is there any way I can put something like a listener on the data(a String) and once its updated an event will fire that will do what it needs to do? I tried using yield() and it seemed to just keep returning to the thread I called yield() from. Thanks

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• Way to kill python thread from inside thread?

  - by user859434

  I have some python code that currently performs expensive computation by performing the computation in parallel through many threads. For a given time period, many threads are created and started on the fly that share the same code which is explicitly stated within the run method of the thread. My question is how do I stop/kill a thread at the end of its run method? (the run is only called once) I need to do this in order to create more threads for the next batch of computation. #Example class someThread(threading.Thread): def __init__(self): #some init code def run(self): #Explicitly Stated Code without constant loops #Something performed to stop/kill this thread

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• Installing Apache MPM Worker on Centos 5.5

  - by mrmartinblue

  I have a CentOS 5.5. server and am trying to switch from MPM Prefork to MPM worker. I have the standard yum httpd packages installed currently and from my reading I did the following: Uncomment the httpd.worker line in the /etc/sysconfig/httpd file. I also made sure that the httpd.worker file exists in the /usr/sbin/ directory. I also made sure that httpd service is stopped before making the above change. Ensured PHP was disabled for Apache. I'm fine with this and will use FastCGI to handle PHP files once I get the MPM worker up and running. Restart the httpd service, everything starts fine. Do a # httpd -V The console tells me it's still using prefork. If I do a # vi /etc/init.d/httpd the httpd.worker line is still commented out. I've tried changed this as well to no difference. Any suggestions? Things to look at? My application requires the worker MPM so the only choice I can think of is to go with ubuntu or another flavor that has the dedicated apache2-mpm-worker package. Is there something similar in the yum repos somewhere? Thanks in advance!

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• C++/CLI managed thread cleanup

  - by Guillermo Prandi

  Hi. I'm writing a managed C++/CLI library wrapper for the MySQL embedded server. The mysql C library requires me to call mysql_thread_init() for every thread that will be using it, and mysql_thread_end() for each thread that exits after using it. Debugging any given VB.Net project I can see at least seven threads; I suppose my library will see only one thread if VB doesn't explicitly create worker threads itself (any confirmations on that?). However, I need clients to my library to be able to create worker threads if they need to, so my library must be thread-aware to some degree. The first option I could think of is to expose some "EnterThread()" and "LeaveThread()" methods in my class, so the client code will explicitly call them at the beginning and before exiting their DoWork() method. This should work if (1) .Net doesn't "magically" create threads the user isn't aware of and (2) the user is careful enough to have the methods called in a try/finally structure of some sort. However, I don't like it very much to have the user handle things manually like that, and I wonder if I could give her a hand on that matter. In a pure Win32 C/C++ DLL I do have the DllMain DLL_THREAD_ATTACH and DLL_THREAD_DETACH pseudo-events, and I could use them for calling mysql_thread_init() and mysql_thread_end() as needed, but there seem to be no such thing in C++/CLI managed code. At the expense of some performance (not much, I think) I can use TLS for detecting the "usage from a new thread" case, but I can imagine no mechanism for the thread exiting case. So, my questions are: (1) could .net create application threads without the user being aware of them? and (2) is there any mechanism I could use similar to DLL_THREAD_ATTACH / DLL_THREAD_DETACH from managed C++/CLI? Thanks in advance.

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• Java - Thread problem

  - by Yatendra Goel

  My question is related to all those methods(including Thread.sleep(...)) which throw InterruptedException. I found a statement on Sun's tutorial saying InterruptedException is an exception that sleep throws when another thread interrupts the current thread while sleep is active. Is that means that the interrupt will be ignored if the sleep is not active at the time of interrupt? Suppose I have two threads: threadOne and threadTwo. threadOne creates and starts threadTwo. threadTwo executes a runnable whose run method is something like: public void run() { : : try { Thread.sleep(10 * 1000); } catch (InterruptedException e) { return; } : : : // In the middle of two sleep invocations : : try { Thread.sleep(10 * 1000); } catch (InterruptedException e) { return; } : : } After thread creation, threadOne interrupts threadTwo. Suppose the threadTwo is in the middle of two sleep invocations at the time of interrupt (when no sleep method was active), then will the second sleep method throw InterrupteException as soon as it is invoked? If not, then will this interrupt will be ignored forever? How to be sure that threadTwo will always know about the interrupt (doesn't matter whether its one of the sleep method is active or not)?

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• Is boost shared_ptr <XXX> thread safe?

  - by sxingfeng

  I have a question about boost :: shared_ptr. There are lots of thread. class CResource { xxxxxx } class CResourceBase { public: void SetResource(shared_ptr<CResource> res) { m_Res = res; } shared_ptr<CResource> GetResource() { return m_Res; } private: shared_ptr<CResource> m_Res; } CResourceBase base; //---------------------------------------------- Thread A: while (true) { ...... shared_ptr<CResource> nowResource = base.GetResource(); nowResource.doSomeThing(); ... } Thread B: shared_ptr<CResource> nowResource; base.SetResource(nowResource); ... //----------------------------------------------------------- If thread A do not care the nowResource is the newest . Will this part of code have problem? I mean when ThreadB do not SetResource completely, Thread A get a wrong smart point by GetResource? Another question : what does thread-safe mean? If I do not care about whether the resource is newest, will the shared_ptr nowResource crash the program when the nowResource is released or will the problem destroy the shared_point?

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• Sheet and thread memory problem

  - by Xident

  Hi Guys, recently I started a project which can export some precalculated Grafix/Audio to files, for after processing. All I was doing is to put a new Window (with progressindicator and an Abort Button) in my main xib and opened it using the following code: [NSApp beginSheet: REC_Sheet modalForWindow: MOTHER_WINDOW modalDelegate: self didEndSelector: nil contextInfo: nil]; NSModalSession session=[NSApp beginModalSessionForWindow:REC_Sheet]; RECISNOTDONE=YES; while (RECISNOTDONE) { if ([NSApp runModalSession:session]!=NSRunContinuesResponse) break; usleep(100); } [NSApp endModalSession:session]; A Background Thread (pthread) was started earlier, to actually perform the work and save all the targas/wave file. Which worked great, but after an amount of time, it turned out that the main thread was not responding anymore and my memory footprint raised unstoppable. I tried to debug it with Instruments, and saw a lot of CFHash etc stuff growing to infinity. By accident i clicked below the sheet, and temporary it helped, the main thread (AppKit ?) was releasing it's stuff, but just for a little time. I can't explain it to me, first of all I thought it was the access from my thread to the Progressbar to update the Progress (intervalled at 0,5sec), so I cut it out. But even if I'm not updating anything and did nothing with the Progressbar, my Application eat up all the Memory, because of not releasing it's "Main-Event" or whatsoever Stuff. Is there any possibility to "drain" this Main thread Memory stuff (Runloop / NSApp call?). And why the heck doesn't the Main thread respond anymore (after this simple task) ??? I don't have a clou anymore, please help ! Thanks in advance ! P.S. How do you guys implement "threaded long task" Stuff and updating your gui ???

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• How do I notify Oracle that an IIS Worker Process is about to recycle?

  - by Brien

  I have an ASP.NET web application with an Oracle back end. The worker process recycling in IIS is set for 40 minutes, and when that occurs, the Oracle server sets a mutex lock while it cleans up all of its open connections. During this cleanup (up to a few minutes in duration), all DB requests get a timeout. Is there a way for IIS to notify Oracle that a worker process recycle is about to occur, so Oracle can be smarter about how it cleans up its resources without locking the entire database?

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