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• Setting minimum threads in thread pool

  - by expert

  I have an application with 4 worker threads from the thread pool. It was waking up every 0.5 second. as written in msdn the thread pool monitors every 0,5 second to create idle threads. I set the nuber of minimum threads to 4 and it solved the problem - no more background activity all the time. My question is - I have another applicatiopn which has the same number of threads threads-4, but here setting min thread to 4 doesn't help but when setting min thread to 5 then the background monitoring stops. What might be the difference between 2 application with the same number of threads from the thread pool- 4 threads.On one setting min threads to 4 helps and the other only setting min threads to 5 helps?

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• Multi-threading does not work correctly using std::thread (C++ 11)

  - by user1364743

  I coded a small c++ program to try to understand how multi-threading works using std::thread. Here's the step of my program execution : Initialization of a 5x5 matrix of integers with a unique value '42' contained in the class 'Toto' (initialized in the main). I print the initialized 5x5 matrix. Declaration of std::vector of 5 threads. I attach all threads respectively with their task (threadTask method). Each thread will manipulate a std::vector<int> instance. I join all threads. I print the new state of my 5x5 matrix. Here's the output : 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 It should be : 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 0 0 0 0 0 1 1 1 1 1 2 2 2 2 2 3 3 3 3 3 4 4 4 4 4 Here's the code sample : #include <iostream> #include <vector> #include <thread> class Toto { public: /* ** Initialize a 5x5 matrix with the 42 value. */ void initData(void) { for (int y = 0; y < 5; y++) { std::vector<int> vec; for (int x = 0; x < 5; x++) { vec.push_back(42); } this->m_data.push_back(vec); } } /* ** Display the whole matrix. */ void printData(void) const { for (int y = 0; y < 5; y++) { for (int x = 0; x < 5; x++) { printf("%d ", this->m_data[y][x]); } printf("\n"); } printf("\n"); } /* ** Function attached to the thread (thread task). ** Replace the original '42' value by another one. */ void threadTask(std::vector<int> &list, int value) { for (int x = 0; x < 5; x++) { list[x] = value; } } /* ** Return the m_data instance propertie. */ std::vector<std::vector<int> > &getData(void) { return (this->m_data); } private: std::vector<std::vector<int> > m_data; }; int main(void) { Toto toto; toto.initData(); toto.printData(); //Display the original 5x5 matrix (first display). std::vector<std::thread> threadList(5); //Initialization of vector of 5 threads. for (int i = 0; i < 5; i++) { //Threads initializationss std::vector<int> vec = toto.getData()[i]; //Get each sub-vectors. threadList.at(i) = std::thread(&Toto::threadTask, toto, vec, i); //Each thread will be attached to a specific vector. } for (int j = 0; j < 5; j++) { threadList.at(j).join(); } toto.printData(); //Second display. getchar(); return (0); } However, in the method threadTask, if I print the variable list[x], the output is correct. I think I can't print the correct data in the main because the printData() call is in the main thread and the display in the threadTask function is correct because the method is executed in its own thread (not the main one). It's strange, it means that all threads created in a parent processes can't modified the data in this parent processes ? I think I forget something in my code. I'm really lost. Does anyone can help me, please ? Thank a lot in advance for your help.

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• Keeping up with Technology

  - by kennedysteve

  If you're like me, you have a hard time keeping up with all the technologies out there. The reality is there's too many new technologies (languages, methodologies,  tools, etc). One of the ways I try to keep up with everything is by using good ol' RSS feeds in conjunction with Google Reader. Google Reader is both an online aggregator of RSS feeds, and it also has a good companion app on Google Android. The nicest part of Google Reader for me is the "All Listings" view which gives me a reverse chronological view of ALL articles (mixed together) regardless of the actual RSS feed.  This way, I get to see the newest articles first. I can then choose to hide the articles I've viewed, etc. Here is a list of my RSS feeds. Admittedly, some of these are all over the spectrum. But you might find one or two interesting. .NET Rocks! RSS = http://feeds.feedburner.com/netRocksFullMp3Downloads Main Web Site = http://www.dotnetrocks.com Channel 9 RSS = http://channel9.msdn.com/Feeds/RSS Main Web Site = http://channel9.msdn.com/ CodePlex  RSS = http://www.codeplex.com/site/feeds/rss Main Web Site = http://www.codeplex.com/site/feeds/rss Connected Show Developer Podcast! RSS = http://feeds.connectedshow.com/ConnectedShow Main Web Site = http://www.ConnectedShow.com/ dnrTV RSS = http://feeds.feedburner.com/DnrtvWmv?format=xml Main Web Site = http://dnrtv.com ebookshare RSS = http://www.ebookshare.net/feed/ Main Web Site = http://www.ebookshare.net Geekswithblogs.net RSS = http://feeds.feedburner.com/geekswithblogs Main Web Site = http://geekswithblogs.net/mainfeed.aspx Gmail Blog RSS = http://feeds.feedburner.com/OfficialGmailBlog?format=xml Main Web Site = http://gmailblog.blogspot.com/ Google Mobile Blog RSS = http://feeds.feedburner.com/OfficialGoogleMobileBlog Main Web Site = http://googlemobile.blogspot.com/ Herding Code RSS = http://feeds.feedburner.com/herdingcode Main Web Site = http://herdingcode.com LearnVisualStudio.NET Videos RSS = http://www.learnvisualstudio.net/videos.rss Main Web Site = http://www.learnvisualstudio.net/ Microsoft Learning Upcoming = Microsoft Learning Upcoming Titles RSS = http://learning.microsoft.com/rss/en-US/upcomingtitles?brand=Learning Main Web Site = http://learning.microsoft.com:80/rss/en-US/upcomingtitles?brand=Learning MS On-demand Webcasts RSS = http://www.microsoft.com/communities/rss.aspx?&Title=On-Demand+Webcasts&RssTitle=Microsoft+Webcasts%3A+On-Demand+Webcasts&CMTYSvcSource=MSCOMMedia&WebNewsURL=http%3A%2F%2Fwww.microsoft.com%2Fevents%2FEventDetails.aspx&CMTYRawShape=list&Params=+%0D%0A%09~CMTYDataSvcParams%5E%0D%0A%09~arg+Name%3D'EventType'+Value%3D'OnDemandWebcast'%2F%5E%0D%0A%09~arg+Name%3D'ProviderID'+Value%3D'A6B43178-497C-4225-BA42-DF595171F04C'%2F%5E%0D%0A%09~arg+Name%3D'StartDate'+Value%3D'06%2F30%2F2006'%2F%5E%0D%0A%09~arg+Name%3D'EndDate'+Value%3D'Now%2B0'%2F%5E%0D%0A%09~%2FCMTYDataSvcParams%5E+&NumberOfItems=100 Main Web Site = http://www.microsoft.com/events/default.mspx MS Podcasts for Devs RSS = http://www.microsoft.com/events/podcasts/default.aspx?podcast=rss&audience=Audience-e5381407-359f-4922-97d0-0237af790eee&pageId=x40 Main Web Site = http://www.microsoft.com/events/podcasts/default.aspx?audience=Audience-e5381407-359f-4922-97d0-0237af790eee&pageId=x40&WT.rss_ev=f MSDN Blogs RSS = http://blogs.msdn.com/b/mainfeed.aspx?Type=BlogsOnly Main Web Site = http://blogs.msdn.com/b/ MSDN Radio RSS = http://www.microsoft.com/events/podcasts/default.aspx?topic=&audience=&view=&pageId=x73&seriesID=Series-b9139976-8d48-4249-9b89-ccd17891de1e.xml&podcast=rss&type=wma Main Web Site = http://www.microsoft.com/events/podcasts/default.aspx?seriesID=Series-b9139976-8d48-4249-9b89-ccd17891de1e.xml&pageId=x73&WT.rss_ev=f O'Reilly Deal of the Day RSS = http://feeds.feedburner.com/oreilly/ebookdealoftheday Main Web Site = http://oreilly.com O'Reilly New RSS = http://feeds.feedburner.com/oreilly/newbooks Main Web Site = http://oreilly.com/ Safari Books Online RSS = http://my.safaribooksonline.com/rss Main Web Site = http://my.safaribooksonline.com/ ScottGu's Blog RSS = http://weblogs.asp.net/scottgu/rss.aspx Main Web Site = http://weblogs.asp.net/scottgu/default.aspx SourceForge Community Blog RSS = http://sourceforge.net/blog/feed/ Main Web Site = http://sourceforge.net/blog Stack Overflow RSS = http://blog.stackoverflow.com/feed/ Main Web Site = http://blog.stackoverflow.com Stepcase Lifehack RSS = http://www.lifehack.org/feed/ Main Web Site = http://www.lifehack.org TechNet Radio RSS = http://www.microsoft.com/events/podcasts/default.aspx?topic=&audience=&view=&pageId=x73&seriesID=Series-cc4e3db2-9212-43c5-a57b-d43fa31e6452.xml&podcast=rss&type=wma Main Web Site = http://www.microsoft.com/events/podcasts/default.aspx?seriesID=Series-cc4e3db2-9212-43c5-a57b-d43fa31e6452.xml&pageId=x73&WT.rss_ev=f Wrox All New Titles RSS = http://www.wrox.com/WileyCDA/feed/RSS_WROX_ALLNEW.xml Main Web Site = http://www.wrox.com

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• JRE not working on firefox

  - by user1488595

  I am attempting to get JRE 7 run in firefox in ubuntu 12.04, 32 bit. I've tried to follow this article: www.liberiangeek.net/2012/04/install-oracle-java-runtime-jre-7-in-ubuntu-12-04-precise-pangolin/ . I've also tried this repository: www.webupd8.org/2012/06/how-to-install-oracle-java-7-in-debian.html As well as installing JDK, which contains JRE, by following this article: www.liberiangeek.net/2012/04/install-oracle-java-jdk-7-in-ubuntu-12-04-precise-pangolin/ With all above method of installation, I get the following error in firefox console when I run applet with firefox: java.io.IOException: Cannot run program "/usr/lib/jvm/jre1.7.0/bin/java": error=13, Permission denied at java.lang.ProcessBuilder.start(Unknown Source) at sun.plugin2.jvm.JVMLauncher.start(Unknown Source) at sun.plugin2.main.server.JVMInstance.startImpl(Unknown Source) at sun.plugin2.main.server.JVMInstance.start(Unknown Source) at sun.plugin2.main.server.JVMManager.getOrCreateBestJVMInstance(Unknown Source) at sun.plugin2.main.server.JVMManager.startAppletImpl(Unknown Source) at sun.plugin2.main.server.JVMManager.startApplet(Unknown Source) at sun.plugin2.main.server.JVMManager.startApplet(Unknown Source) at sun.plugin2.main.server.MozillaPlugin.maybeStartApplet(Unknown Source) at sun.plugin2.main.server.MozillaPlugin.setWindow(Unknown Source) Caused by: java.io.IOException: error=13, Permission denied at java.lang.UNIXProcess.forkAndExec(Native Method) at java.lang.UNIXProcess.(Unknown Source) at java.lang.ProcessImpl.start(Unknown Source) ... 10 more java.io.IOException at sun.plugin2.main.server.JVMInstance.startImpl(Unknown Source) at sun.plugin2.main.server.JVMInstance.start(Unknown Source) at sun.plugin2.main.server.JVMManager.getOrCreateBestJVMInstance(Unknown Source) at sun.plugin2.main.server.JVMManager.startAppletImpl(Unknown Source) at sun.plugin2.main.server.JVMManager.startApplet(Unknown Source) at sun.plugin2.main.server.JVMManager.startApplet(Unknown Source) at sun.plugin2.main.server.MozillaPlugin.maybeStartApplet(Unknown Source) at sun.plugin2.main.server.MozillaPlugin.setWindow(Unknown Source) Caused by: java.io.IOException: Cannot run program "/usr/lib/jvm/jre1.7.0/bin/java": error=13, Permission denied at java.lang.ProcessBuilder.start(Unknown Source) at sun.plugin2.jvm.JVMLauncher.start(Unknown Source) ... 8 more Caused by: java.io.IOException: error=13, Permission denied at java.lang.UNIXProcess.forkAndExec(Native Method) at java.lang.UNIXProcess.(Unknown Source) at java.lang.ProcessImpl.start(Unknown Source) ... 10 more Exception in thread "main" java.lang.RuntimeException: java.io.IOException at sun.plugin2.main.server.JVMManager.getOrCreateBestJVMInstance(Unknown Source) at sun.plugin2.main.server.JVMManager.startAppletImpl(Unknown Source) at sun.plugin2.main.server.JVMManager.startApplet(Unknown Source) at sun.plugin2.main.server.JVMManager.startApplet(Unknown Source) at sun.plugin2.main.server.MozillaPlugin.maybeStartApplet(Unknown Source) at sun.plugin2.main.server.MozillaPlugin.setWindow(Unknown Source) Caused by: java.io.IOException at sun.plugin2.main.server.JVMInstance.startImpl(Unknown Source) at sun.plugin2.main.server.JVMInstance.start(Unknown Source) ... 6 more Caused by: java.io.IOException: Cannot run program "/usr/lib/jvm/jre1.7.0/bin/java": error=13, Permission denied at java.lang.ProcessBuilder.start(Unknown Source) at sun.plugin2.jvm.JVMLauncher.start(Unknown Source) ... 8 more Caused by: java.io.IOException: error=13, Permission denied at java.lang.UNIXProcess.forkAndExec(Native Method) at java.lang.UNIXProcess.(Unknown Source) at java.lang.ProcessImpl.start(Unknown Source) ... 10 more I've tried to type: sudo chmod 777 /usr/lib/jvm/jre1.7.0/bin/java It did not work. I also tried to run Eclipse, which requires JRE to run. It did not work originally(it works now), returning the following error: java.lang.UnsatisfiedLinkError: Could not load SWT library. Reasons: no swt-gtk-3740 in java.library.path no swt-gtk in java.library.path Can't load library: /home/username/.swt/lib/linux/x86/libswt-gtk-3740.so Can't load library: /home/usename/.swt/lib/linux/x86/libswt-gtk.so at org.eclipse.swt.internal.Library.loadLibrary(Library.java:285) By running "ln -s /usr/lib/jni/libswt-* ~/.swt/lib/linux/x86/" (Thanks, stackoverflow.com/questions/10970754/cant-open-eclipse-in-ubuntu-12-04-java-lang-unsatisfiedlinkerror-could-not-l), Eclipse works again. I have been googling this for days, without luck. Any response would be appreciated.

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• 'sudo apt-get update' error on Ubuntu 12.04

  - by Mohd Arafat Hossain

  When I type in 'sudo apt-get update' I get this mohd-arafat-hossain@TUD:~$ sudo apt-get update [sudo] password for mohd-arafat-hossain: Ign http://bd.archive.ubuntu.com precise InRelease Ign http://bd.archive.ubuntu.com precise-updates InRelease Ign http://bd.archive.ubuntu.com precise-backports InRelease Ign http://bd.archive.ubuntu.com precise Release.gpg Ign http://bd.archive.ubuntu.com precise-updates Release.gpg Ign http://bd.archive.ubuntu.com precise-backports Release.gpg Ign http://bd.archive.ubuntu.com precise Release Ign http://bd.archive.ubuntu.com precise-updates Release Ign http://bd.archive.ubuntu.com precise-backports Release Ign http://extras.ubuntu.com precise InRelease Ign http://ppa.launchpad.net precise InRelease Hit http://extras.ubuntu.com precise Release.gpg Hit http://ppa.launchpad.net precise Release.gpg Hit http://extras.ubuntu.com precise Release Hit http://ppa.launchpad.net precise Release Hit http://extras.ubuntu.com precise/main Sources Hit http://bd.archive.ubuntu.com precise/main TranslationIndex Hit http://ppa.launchpad.net precise/main Sources Hit http://bd.archive.ubuntu.com precise/multiverse TranslationIndex Hit http://bd.archive.ubuntu.com precise/restricted TranslationIndex Hit http://extras.ubuntu.com precise/main i386 Packages Ign http://extras.ubuntu.com precise/main TranslationIndex Hit http://bd.archive.ubuntu.com precise/universe TranslationIndex Hit http://ppa.launchpad.net precise/main i386 Packages Ign http://ppa.launchpad.net precise/main TranslationIndex Ign http://security.ubuntu.com precise-security InRelease Hit http://security.ubuntu.com precise-security Release.gpg Hit http://bd.archive.ubuntu.com precise-updates/main TranslationIndex Hit http://security.ubuntu.com precise-security Release Hit http://bd.archive.ubuntu.com precise-updates/multiverse TranslationIndex Hit http://bd.archive.ubuntu.com precise-updates/restricted TranslationIndex Hit http://bd.archive.ubuntu.com precise-updates/universe TranslationIndex Hit http://security.ubuntu.com precise-security/main Sources Ign http://extras.ubuntu.com precise/main Translation-en_US Ign http://ppa.launchpad.net precise/main Translation-en_US Ign http://extras.ubuntu.com precise/main Translation-en Hit http://bd.archive.ubuntu.com precise-backports/main TranslationIndex Hit http://bd.archive.ubuntu.com precise-backports/multiverse TranslationIndex Hit http://bd.archive.ubuntu.com precise-backports/restricted TranslationIndex Ign http://ppa.launchpad.net precise/main Translation-en Hit http://bd.archive.ubuntu.com precise-backports/universe TranslationIndex Hit http://bd.archive.ubuntu.com precise/main Translation-en Hit http://bd.archive.ubuntu.com precise/multiverse Translation-en Hit http://bd.archive.ubuntu.com precise/restricted Translation-en Hit http://bd.archive.ubuntu.com precise/universe Translation-en Hit http://security.ubuntu.com precise-security/restricted Sources Hit http://security.ubuntu.com precise-security/universe Sources Hit http://security.ubuntu.com precise-security/multiverse Sources Hit http://security.ubuntu.com precise-security/main i386 Packages Hit http://security.ubuntu.com precise-security/restricted i386 Packages Hit http://bd.archive.ubuntu.com precise-updates/main Translation-en Hit http://bd.archive.ubuntu.com precise-updates/multiverse Translation-en Hit http://security.ubuntu.com precise-security/universe i386 Packages Hit http://security.ubuntu.com precise-security/multiverse i386 Packages Hit http://security.ubuntu.com precise-security/main TranslationIndex Hit http://security.ubuntu.com precise-security/multiverse TranslationIndex Hit http://security.ubuntu.com precise-security/restricted TranslationIndex Hit http://security.ubuntu.com precise-security/universe TranslationIndex Hit http://bd.archive.ubuntu.com precise-updates/restricted Translation-en Hit http://bd.archive.ubuntu.com precise-updates/universe Translation-en Hit http://security.ubuntu.com precise-security/main Translation-en Hit http://security.ubuntu.com precise-security/multiverse Translation-en Hit http://security.ubuntu.com precise-security/restricted Translation-en Hit http://security.ubuntu.com precise-security/universe Translation-en Hit http://bd.archive.ubuntu.com precise-backports/main Translation-en Hit http://bd.archive.ubuntu.com precise-backports/multiverse Translation-en Hit http://bd.archive.ubuntu.com precise-backports/restricted Translation-en Hit http://bd.archive.ubuntu.com precise-backports/universe Translation-en Err http://bd.archive.ubuntu.com precise/main Sources 404 Not Found Err http://bd.archive.ubuntu.com precise/restricted Sources 404 Not Found Err http://bd.archive.ubuntu.com precise/universe Sources 404 Not Found Err http://bd.archive.ubuntu.com precise/multiverse Sources 404 Not Found Err http://bd.archive.ubuntu.com precise/main i386 Packages 404 Not Found Err http://bd.archive.ubuntu.com precise/restricted i386 Packages 404 Not Found Err http://bd.archive.ubuntu.com precise/universe i386 Packages 404 Not Found Err http://bd.archive.ubuntu.com precise/multiverse i386 Packages 404 Not Found Err http://bd.archive.ubuntu.com precise-updates/main Sources 404 Not Found Err http://bd.archive.ubuntu.com precise-updates/restricted Sources 404 Not Found Err http://bd.archive.ubuntu.com precise-updates/universe Sources 404 Not Found Err http://bd.archive.ubuntu.com precise-updates/multiverse Sources 404 Not Found Err http://bd.archive.ubuntu.com precise-updates/main i386 Packages 404 Not Found Err http://bd.archive.ubuntu.com precise-updates/restricted i386 Packages 404 Not Found Err http://bd.archive.ubuntu.com precise-updates/universe i386 Packages 404 Not Found Err http://bd.archive.ubuntu.com precise-updates/multiverse i386 Packages 404 Not Found Err http://bd.archive.ubuntu.com precise-backports/main Sources 404 Not Found Err http://bd.archive.ubuntu.com precise-backports/restricted Sources 404 Not Found Err http://bd.archive.ubuntu.com precise-backports/universe Sources 404 Not Found Err http://bd.archive.ubuntu.com precise-backports/multiverse Sources 404 Not Found Err http://bd.archive.ubuntu.com precise-backports/main i386 Packages 404 Not Found Err http://bd.archive.ubuntu.com precise-backports/restricted i386 Packages 404 Not Found Err http://bd.archive.ubuntu.com precise-backports/universe i386 Packages 404 Not Found Err http://bd.archive.ubuntu.com precise-backports/multiverse i386 Packages 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise/main/source/Sources 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise/restricted/source/Sources 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise/universe/source/Sources 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise/multiverse/source/Sources 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise/main/binary-i386/Packages 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise/restricted/binary-i386/Packages 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise/universe/binary-i386/Packages 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise/multiverse/binary-i386/Packages 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-updates/main/source/Sources 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-updates/restricted/source/Sources 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-updates/universe/source/Sources 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-updates/multiverse/source/Sources 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-updates/main/binary-i386/Packages 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-updates/restricted/binary-i386/Packages 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-updates/universe/binary-i386/Packages 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-updates/multiverse/binary-i386/Packages 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-backports/main/source/Sources 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-backports/restricted/source/Sources 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-backports/universe/source/Sources 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-backports/multiverse/source/Sources 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-backports/main/binary-i386/Packages 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-backports/restricted/binary-i386/Packages 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-backports/universe/binary-i386/Packages 404 Not Found W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-backports/multiverse/binary-i386/Packages 404 Not Found E: Some index files failed to download. They have been ignored, or old ones used instead. How do solve this issue and not get this error. Please

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• Package Dependencies Error in almost every install

  - by Betaxpression

  New to Ubuntu. In the other sofware sources i have "Debian 4.0 eth" officially supported "non-us.debian.org/"; etc ... "ppa.launcpad.net" and installing applications has stopped working. I think i first came across this problem after installing Blender 2.58 When using update manager it is prompting for a partial upgrade. Almost every software when trying to install showing the same error Package Dependencies Error or GPG PUB KEY missing, tried to fixing to them but no luck. Output to: sudo apt-get update && sudo apt-get upgrade (links disabled http:// -- http:/ as new user can't put more no. of hyperlinks) Ign http:/non-us.debian.org stable/non-US InRelease Ign http:/non-us.debian.org stable/non-US Release.gpg Ign http:/non-us.debian.org stable/non-US Release Ign http:/non-us.debian.org stable/non-US/contrib TranslationIndex Ign http:/non-us.debian.org stable/non-US/main TranslationIndex Ign http:/non-us.debian.org stable/non-US/non-free TranslationIndex Err http:/non-us.debian.org stable/non-US/main Sources 503 Service Unavailable Err http:/non-us.debian.org stable/non-US/contrib Sources 503 Service Unavailable Err http:/non-us.debian.org stable/non-US/non-free Sources 503 Service Unavailable Err http:/non-us.debian.org stable/non-US/main amd64 Packages 503 Service Unavailable Err http:/non-us.debian.org stable/non-US/contrib amd64 Packages 503 Service Unavailable Err http:/non-us.debian.org stable/non-US/non-free amd64 Packages 503 Service Unavailable Ign http:/non-us.debian.org stable/non-US/contrib Translation-en_IN Ign http:/non-us.debian.org stable/non-US/contrib Translation-en Ign http:/non-us.debian.org stable/non-US/main Translation-en_IN Ign http:/non-us.debian.org stable/non-US/main Translation-en Ign http:/non-us.debian.org stable/non-US/non-free Translation-en_IN Ign http:/non-us.debian.org stable/non-US/non-free Translation-en Ign http:/archive.ubuntu.com natty InRelease Ign http:/archive.canonical.com natty InRelease Ign http:/extras.ubuntu.com natty InRelease Ign http:/http.us.debian.org stable InRelease Ign http:/ftp.us.debian.org etch InRelease Ign http:/archive.ubuntu.com natty-updates InRelease Hit http:/archive.canonical.com natty Release.gpg Get:1 http:/extras.ubuntu.com natty Release.gpg [72 B] Ign http:/ppa.launchpad.net natty InRelease Get:2 http:/http.us.debian.org stable Release.gpg [1,672 B] Ign http:/linux.dropbox.com natty InRelease Ign http:/ftp.us.debian.org etch Release.gpg Ign http:/archive.ubuntu.com natty-security InRelease Hit http:/archive.canonical.com natty Release Hit http:/extras.ubuntu.com natty Release Ign http:/ppa.launchpad.net natty InRelease Get:3 http:/linux.dropbox.com natty Release.gpg [489 B] Ign http:/ftp.us.debian.org etch Release Ign http:/dl.google.com stable InRelease Get:4 http:/archive.ubuntu.com natty Release.gpg [198 B] Ign http:/ppa.launchpad.net natty InRelease Hit http:/archive.canonical.com natty/partner Sources Hit http:/extras.ubuntu.com natty/main Sources Get:5 http:/linux.dropbox.com natty Release [2,599 B] Get:6 http:/archive.ubuntu.com natty-updates Release.gpg [198 B] Ign http:/ppa.launchpad.net natty InRelease Hit http:/archive.canonical.com natty/partner amd64 Packages Hit http:/extras.ubuntu.com natty/main amd64 Packages Get:7 http:/linux.dropbox.com natty/main amd64 Packages [784 B] Get:8 http:/archive.ubuntu.com natty-security Release.gpg [198 B] Ign http:/ppa.launchpad.net natty InRelease Ign http:/archive.canonical.com natty/partner TranslationIndex Ign http:/extras.ubuntu.com natty/main TranslationIndex Get:9 http:/http.us.debian.org stable Release [104 kB] Ign http:/linux.dropbox.com natty/main TranslationIndex Hit http:/archive.ubuntu.com natty Release Ign http:/ppa.launchpad.net natty InRelease Ign http:/http.us.debian.org stable Release Hit http:/archive.ubuntu.com natty-updates Release Get:10 http:/ppa.launchpad.net natty InRelease [316 B] Ign http:/ppa.launchpad.net natty InRelease Hit http:/archive.ubuntu.com natty-security Release Get:11 http:/ppa.launchpad.net natty InRelease [316 B] Ign http:/ppa.launchpad.net natty InRelease Hit http:/archive.ubuntu.com natty/restricted Sources Get:12 http:/ppa.launchpad.net natty Release.gpg [316 B] Ign http:/http.us.debian.org stable/main Sources/DiffIndex Get:13 http:/ppa.launchpad.net natty Release.gpg [316 B] Hit http:/archive.ubuntu.com natty/main Sources Ign http:/ftp.us.debian.org etch/contrib TranslationIndex Ign http:/http.us.debian.org stable/contrib Sources/DiffIndex Get:14 http:/ppa.launchpad.net natty Release.gpg [1,502 B] Ign http:/http.us.debian.org stable/non-free Sources/DiffIndex Ign http:/ftp.us.debian.org etch/main TranslationIndex Get:15 http:/ppa.launchpad.net natty Release.gpg [1,928 B] Ign http:/http.us.debian.org stable/main amd64 Packages/DiffIndex Ign http:/ftp.us.debian.org etch/non-free TranslationIndex Ign http:/ppa.launchpad.net natty Release.gpg Hit http:/http.us.debian.org stable/contrib amd64 Packages/DiffIndex W: GPG error: http:/http.us.debian.org stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY AED4B06F473041FA NO_PUBKEY 64481591B98321F9 W: GPG error: http:/ppa.launchpad.net natty InRelease: File /var/lib/apt/lists/partial/ppa.launchpad.net_sunab_kdenlive-release_ubuntu_dists_natty_InRelease doesn't start with a clearsigned message W: GPG error: http:/ppa.launchpad.net natty InRelease: File /var/lib/apt/lists/partial/ppa.launchpad.net_ubuntu-wine_ppa_ubuntu_dists_natty_InRelease doesn't start with a clearsigned message E: Could not open file /var/lib/apt/lists/http.us.debian.org_debian_dists_stable_contrib_binary-amd64_Packages.IndexDiff - open (2: No such file or directory) output to: sudo cat /etc/apt/sources.list # deb cdrom:[Ubuntu 11.04 _Natty Narwhal_ - Release amd64 (20110427.1)]/ natty main restricted # See http:/help.ubuntu.com/community/UpgradeNotes for how to upgrade to # newer versions of the distribution. deb http:/archive.ubuntu.com/ubuntu natty main restricted deb-src http:/archive.ubuntu.com/ubuntu natty restricted main multiverse universe #Added by software-properties ## Major bug fix updates produced after the final release of the ## distribution. deb http:/archive.ubuntu.com/ubuntu natty-updates main restricted deb-src http:/archive.ubuntu.com/ubuntu natty-updates restricted main multiverse universe #Added by software-properties ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team. Also, please note that software in universe WILL NOT receive any ## review or updates from the Ubuntu security team. deb http:/archive.ubuntu.com/ubuntu natty universe deb http:/archive.ubuntu.com/ubuntu natty-updates universe ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team, and may not be under a free licence. Please satisfy yourself as to ## your rights to use the software. Also, please note that software in ## multiverse WILL NOT receive any review or updates from the Ubuntu ## security team. deb http:/archive.ubuntu.com/ubuntu natty multiverse deb http:/archive.ubuntu.com/ubuntu natty-updates multiverse ## Uncomment the following two lines to add software from the 'backports' ## repository. ## N.B. software from this repository may not have been tested as ## extensively as that contained in the main release, although it includes ## newer versions of some applications which may provide useful features. ## Also, please note that software in backports WILL NOT receive any review ## or updates from the Ubuntu security team. # deb http:/us.archive.ubuntu.com/ubuntu/ natty-backports main restricted universe multiverse # deb-src http:/us.archive.ubuntu.com/ubuntu/ natty-backports main restricted universe multiverse deb http:/archive.ubuntu.com/ubuntu natty-security main restricted deb-src http:/archive.ubuntu.com/ubuntu natty-security restricted main multiverse universe #Added by software-properties deb http:/archive.ubuntu.com/ubuntu natty-security universe deb http:/archive.ubuntu.com/ubuntu natty-security multiverse ## Uncomment the following two lines to add software from Canonical's ## 'partner' repository. ## This software is not part of Ubuntu, but is offered by Canonical and the ## respective vendors as a service to Ubuntu users. deb http:/archive.canonical.com/ubuntu natty partner deb-src http:/archive.canonical.com/ubuntu natty partner ## This software is not part of Ubuntu, but is offered by third-party ## developers who want to ship their latest software. deb http:/extras.ubuntu.com/ubuntu natty main deb-src http:/extras.ubuntu.com/ubuntu natty main deb http:/ftp.us.debian.org/debian/ etch main contrib non-free deb-src http:/ftp.us.debian.org/debian/ etch main contrib non-free deb http:/http.us.debian.org/debian stable main contrib non-free deb-src http:/http.us.debian.org/debian stable main contrib non-free deb http:/non-us.debian.org/debian-non-US stable/non-US main contrib non-free deb-src http:/non-us.debian.org/debian-non-US stable/non-US main contrib non-free Thanks But after removing Debian repositories still getting this error: W:GPG error: http://ppa.launchpad.net natty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9BDB3D89CE49EC21, W:GPG error: http://ppa.launchpad.net natty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 80E7349A06ED541C, W:GPG error: http://ppa.launchpad.net natty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8C851674F96FD737, W:GPG error: http://ppa.launchpad.net natty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 94E58C34A8670E8C, E:Unable to parse package file /var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_natty-updates_multiverse_i18n_Index (1) I actually tried this before, but i am always getting this error --Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver keyserver.ubuntu.com --recv-keys 8C851674F96FD737 gpg: requesting key F96FD737 from hkp server keyserver.ubuntu.com ?: keyserver.ubuntu.com: Connection refused gpgkeys: HTTP fetch error 7: couldn't connect: Connection refused gpg: no valid OpenPGP data found. gpg: Total number processed: 0

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• Core Data managed object context thread synchronisation

  - by Ben Reeves

  I'm have an issue where i'm updating a many-to-many relationship in a background thread, which works fine in that threa, but when I send the object back to the main thread the changes do not show. If I close the app and reopen the data is saved fine and the changes show on the main thread. Also using [context lock] instead of a different managed object context works fine. I have tried NSManagedObjectContext: - (BOOL)save:(NSError **)error; - (void)refreshObject:(NSManagedObject *)object mergeChanges:(BOOL)flag; at different stages throughout the process but it doesn't seem to help. My core data code uses the following getter to ensure any operations are thread safe: - (NSManagedObjectContext *) managedObjectContext { NSThread * thisThread = [NSThread currentThread]; if (thisThread == [NSThread mainThread]) { //Main thread just return default context return managedObjectContext; } else { //Thread safe trickery NSManagedObjectContext * threadManagedObjectContext = [[thisThread threadDictionary] objectForKey:CONTEXT_KEY]; if (threadManagedObjectContext == nil) { threadManagedObjectContext = [[[NSManagedObjectContext alloc] init] autorelease]; [threadManagedObjectContext setPersistentStoreCoordinator: [self persistentStoreCoordinator]]; [[thisThread threadDictionary] setObject:threadManagedObjectContext forKey:CONTEXT_KEY]; } return threadManagedObjectContext; } } and when I pass object between threads i'm using -(NSManagedObject*)makeSafe:(NSManagedObject*)object { if ([object managedObjectContext] != [self managedObjectContext]) { NSError * error = nil; object = [[self managedObjectContext] existingObjectWithID:[object objectID] error:&error]; if (error) { NSLog(@"Error makeSafe: %@", error); } } return object; } Any help appreciated

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• WPF Background Thread Invocation

  - by jeffn825

  Maybe I'm mis-remembering how Winforms works or I'm overcomplicating the hell out of this, but here's my problem. I have a WPF client app application that talks to a server over WCF. The current user may "log out" of the WPF client, which closes all open screens, leaves only the navigation pane, and minimizes the program window. When the user re-maximizes the program window, they are prompted to log in. Simple. But sometimes things happen on background threads - like every 5 minutes the client tries to make a WCF calls that refreshes some cached data. And what if the user is logged out when this 5 minute timer triggers? Well, then the user should be prompted to log back in...and this must of course happen on the UI thread. private static ISecurityContext securityContext; public static ISecurityContext SecurityContext { get { if (securityContext == null) { // Login method shows a window and prompts the user to log in Application.Current.Dispatcher.Invoke((Action)Login); } return securityContext; } } So far so good, right? But what happens when multiple threads hit this spot of code? Well, my first intuition was that since I'm syncrhonizing across the Application.Current.Dispatcher, I should be fine, and whichever thread hit first would be responsible for showing the login form and getting the user logged in... Not the case... Thread 1 will hit the code and call ShowDialog on the login form Thread 2 will also hit the code and will call Login as soon as Thread 1 has called ShowDialog, since calling ShowDialog unblocked Thread 1 (I believe because of the way the WPF message pump works) All I want is a synchronized way of getting the user logged back into the application...what am I missing here? Thanks in advance.

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• Moving delegate-related function to a different thread

  - by Chris

  Hello everybody. We are developing a library in C# that communicates with the serial port. We have a function that is given to a delegate. The problem is that we want it to be run in a different thread. We tried creating a new thread (called DatafromBot) but keep using it as follows (first line): comPort.DataReceived += new SerialDataReceivedEventHandler(comPort_DataReceived); DatafromBot = new Thread(comPort_DataReceived); DatafromBot.Start(); comPort_DataReceived is defined as: Thread DatafromBot; public void comPort_DataReceived(object sender, SerialDataReceivedEventArgs e) { ... } The following errors occur: Error 3 The best overloaded method match for 'System.Threading.Thread.Thread(System.Threading.ThreadStart)' has some invalid arguments C:...\IR52cLow\CommunicationManager.cs 180 27 IR52cLow Error 4 Argument '1': cannot convert from 'method group' to 'System.Threading.ThreadStart' C:...\IR52cLow\CommunicationManager.cs 180 38 IR52cLow Any ideas of how we should convert this to get it to compile? Please note that comPort.DataReceived (pay attention to "." instead of "_") lies within a system library and cannot be modified. Thanks for your time! Chris

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• Is NSPasteboard thread-safe?

  - by Joe

  Is it safe to write data to an NSPasteboard object from a background thread? I can't seem to find a definitive answer anywhere. I think the assumption is that the data will be written to the pasteboard before the drag begins. Background: I have an application that is fetching data from Evernote. When the application first loads, it gets the meta data for each note, but not the note content. The note stubs are then listed in an outline view. When the user starts to drag a note, the notes are passed to the background thread that handles getting the note content from Evernote. Having the main thread block until the data is gotten results in a significant delay and a poor user experience, so I have the [outlineView:writeItems:toPasteboard:] function return YES while the background thread processes the data and invokes the main thread to write the data to the pasteboard object. If the note content gets transferred before the user drops the note somewhere, everything works perfectly. If the user drops the note somewhere before the data has been processed... well, everything blocks forever. Is it safe to just have the background thread write the data to the pasteboard?

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• Static variables and long running thread on IIS 7.5

  - by Dmitry

  Hello people. Help me solve next problem. I have ASP .NET MVC2 application. I run it on IIS 7.5. In one page user clicks button and handler for this button sends request to server (jquery.ajax). At server action in controller starts new thread (it makes long time import): var thread = new Thread(RefreshCitiesInDatabase); thread.Start(); State of import is available in static variable. New thread changes value of variable in the begin of work. User can check state of import too with the help of this variable, which is used in view. And user sees import's state. When I start this function few minutes everything is okey. On page I see right state of import, quantity of imported records is changed, I see changes in logs. But after few minutes begin troubles. When I refresh page with import state sometimes I see that import is okey but sometimes I see page with default values about import (like application is just started), but after that again I can see page with normal import's state. I tried to attach Visual Studio to IIS process and debug application. But when request comes to controller sometimes static variables have right values and sometimes they have default values (static int has 0, static string has "" etc.). Tell me what I do wrong. May be I must start additional thread in other way? Thanks in advance, Dmitry

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• How to know if all the Thread Pool's thread are already done with its tasks?

  - by mcxiand

  I have this application that will recurse all folders in a given directory and look for PDF. If a PDF file is found, the application will count its pages using ITextSharp. I did this by using a thread to recursively scan all the folders for pdf, then if then PDF is found, this will be queued to the thread pool. The code looks like this: //spawn a thread to handle the processing of pdf on each folder. var th = new Thread(() => { pdfDirectories = Directory.GetDirectories(pdfPath); processDir(pdfDirectories); }); th.Start(); private void processDir(string[] dirs) { foreach (var dir in dirs) { pdfFiles = Directory.GetFiles(dir, "*.pdf"); processFiles(pdfFiles); string[] newdir = Directory.GetDirectories(dir); processDir(newdir); } } private void processFiles(string[] files) { foreach (var pdf in files) { ThreadPoolHelper.QueueUserWorkItem( new { path = pdf }, (data) => { processPDF(data.path); } ); } } My problem is, how do i know that the thread pool's thread has finished processing all the queued items so i can tell the user that the application is done with its intended task?

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• c++ multithread

  - by chnet

  I use c++ to implement a thread class. The code is in the following. I initialize two objects, wish it will start two threads (I use pthread_self() to look the thread Id). But the result shows that there is only one thread beside the main thread. I am a bit confused... class Thread { public: int mask; pthread_t thread; Thread( int ); void start(); static void * EntryPoint (void *); void Run(); }; Thread::Thread( int a) { mask =a; } void Thread::Run() { cout<<"thread begin to run" <<endl; cout <<" Thread Id is: "<< pthread_self() << endl; // the same thread Id. } void * Thread::EntryPoint(void * pthis) { cout << "entry" <<endl; Thread *pt = (Thread *) pthis; pt->Run(); } void Thread::start() { pthread_create(&thread, NULL, EntryPoint, (void *)ThreadId ); pthread_join(thread, NULL); } int main() { int input_array[8]={3,1,2,5,6,8,7,4}; Thread t1(1); Thread t2(2); t1.start(); t2.start() }

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• c++ multithread

  - by chnet

  I use C++ to implement a thread class. My code shows in the following. I have a problem about how to access thread data. In the class Thread, I create a thread use pthread_create() function. then it calls EntryPoint() function to start thread created. In the Run function, I want to access the mask variable, it always shows segment fault. So, my question is whether the new created thread copy the data in original class? How to access the thread own data? class Thread { public: int mask; pthread_t thread; Thread( int ); void start(); static void * EntryPoint (void *); void Run(); }; Thread::Thread( int a) { mask =a; } void Thread::Run() { cout<<"thread begin to run" <<endl; cout << mask <<endl; // it always show segmentfault here } void * Thread::EntryPoint(void * pthis) { cout << "entry" <<endl; Thread *pt = (Thread *) pthis; pt->Run(); } void Thread::start() { pthread_create(&thread, NULL, EntryPoint, (void *)ThreadId ); pthread_join(thread, NULL); } int main() { int input_array[8]={3,1,2,5,6,8,7,4}; Thread t1(1); t1.start(); }

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• Disposing ActiveX resources owned by another thread

  - by Stefan Teitge

  I've got a problem problem with threading and disposing resources. I've got a C# Windows Forms application which runs expensive operation in a thread. This thread instantiates an ActiveX control (AxControl). This control must be disposed as it uses a high amount of memory. So I implemented a Dispose() method and even a destructor. After the thread ends the destructor is called. This is sadly called by the UI thread. So invoking activexControl.Dispose(); fails with the message "COM object that has been separated from its underlying RCW", as the object belongs to another thread. How to do this correctly or is it just a bad design I use? (I stripped the code down to the minimum including removing any safety concerns.) class Program { [STAThread] static void Main() { // do stuff here, e.g. open a form new Thread(new ThreadStart(RunStuff); // do more stuff } private void RunStuff() { DoStuff stuff = new DoStuff(); stuff.PerformStuff(); } } class DoStuff : IDisposable { private AxControl activexControl; DoStuff() { activexControl = new AxControl(); activexControl.CreateControl(); // force instance } ~DoStuff() { Dispose(); } public void Dispose() { activexControl.Dispose(); } public void PerformStuff() { // invent perpetuum mobile here, takes time } }

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• Determine if the current thread has low I/O priority

  - by Magnus Hoff

  I have a background thread that does some I/O-intensive background type work. To please the other threads and processes running, I set the thread priority to "background mode" using SetThreadPriority, like this: SetThreadPriority(GetCurrentThread(), THREAD_MODE_BACKGROUND_BEGIN); However, THREAD_MODE_BACKGROUND_BEGIN is only available in Windows Server 2008 or newer, as well as Windows Vista and newer, but the program needs to work well on Windows Server 2003 and XP as well. So the real code is more like this: if (!SetThreadPriority(GetCurrentThread(), THREAD_MODE_BACKGROUND_BEGIN)) { SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_LOWEST); } The problem with this is that on Windows XP it will totally disrupt the system by using too much I/O. I have a plan for a ugly and shameful way of mitigating this problem, but that depends on me being able to determine if the current thread has low I/O priority or not. Now, I know I can store which thread priority I ended up setting, but the control flow in the program is not really well suited for this. I would rather like to be able to test later whether or not the current thread has low I/O priority -- if it is in "background mode". GetThreadPriority does not seem to give me this information. Is there any way to determine if the current thread has low I/O priority?

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• Why do InterruptedExceptions clear a thread's interrupted status?

  - by Hanno Fietz

  If a thread is interrupted while inside Object.wait() or Thread.join(), it throws an InterruptedException, which resets the thread's interrupted status. I. e., if I have a loop like this inside a Runnable.run(): while (!this._workerThread.isInterrupted()) { // do something try { synchronized (this) { this.wait(this._waitPeriod); } } catch (InterruptedException e) { if (!this._isStopping()) { this._handleFault(e); } } } the thread will continue to run after calling interrupt(). This means I have to explicitly break out of the loop by checking for my own stop flag in the loop condition, rethrow the exception, or add a break. Now, this is not exactly a problem, since this behaviour is well documented and doesn't prevent me from doing anything the way I want. However, I don't seem to understand the concept behind it: Why is a thread not considered interrupted anymore once the exception has been thrown? A similar behaviour also occurs if you get the interrupted status with interrupted() instead of isInterrupted(), then, too, the thread will only appear interrupted once. Am I doing something unusual here? For example, is it more common to catch the InterruptedException outside the loop? (Even though I'm not exactly a beginner, I tagged this "beginner", because it seems like a very basic question to me, looking at it.)

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• how to call the method in thread with aruguments and return some value

  - by ratty

  i like to call the method in thread with aruguments and return some value here example class Program { static void Main() { Stopwatch stop = new Stopwatch(); stop.Start(); Thread FirstThread = new Thread(new ThreadStart(Fun1)); Thread SecondThread = new Thread(new ThreadStart(Fun2)); FirstThread.Start(); SecondThread.Start(); } public static void Fun1() { for (int i = 1; i <= 1000; i++) { Console.WriteLine("Fun1 writes:{0}", i); } } public static void Fun2() { for (int i = 1000; i >= 6; i--) { Console.WriteLine("Fun2 writes:{0}", i); } } } i know this above example run successfully but if method fun1 like this public int fun1(int i) { for (int n = i; n >= i+10; n++) { Console.WriteLine("Fun2 writes:{0}", i); } } then how can i call this in thread. Is it possible .Any body Help for me

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• Call event from original thread ??

  - by user311883

  Hi all, Here is my problem, I have a class which have a object who throw an event and in this event I throw a custom event from my class. But unfortunately the original object throw the event from another thread and so my event is also throw on another thread. This cause a exception when my custom event try to access from controls. Here is a code sample to better understand : class MyClass { // Original object private OriginalObject myObject; // My event public delegate void StatsUpdatedDelegate(object sender, StatsArgs args); public event StatsUpdatedDelegate StatsUpdated; public MyClass() { // Original object event myObject.AnEvent += new EventHandler(myObject_AnEvent); } // This event is called on another thread private void myObject_AnEvent(object sender, EventArgs e) { // Throw my custom event here StatsArgs args = new StatsArgs(..........); StatsUpdated(this, args); } } So when on my windows form I call try to update a control from the event StatsUpdated I get a cross thread exception cause it has been called on another thread. What I want to do is throw my custom event on the original class thread, so control can be used within it. Anyone can help me ?

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• How to end a thread in perl

  - by user1672190

  I am new to perl and i have a question about perl thread. I am trying to create a new thread to check if the running function is timed out, and my way of doing it is as below. Logic is 1.create a new thread 2.run the main function and see if it is timed out, if ture, kill it Sample code: $exit_tread = false; # a flag to make sure timeout thread will run my $thr_timeout = threads->new( \&timeout ); execute main function here; $exit_thread = true # set the flag to true to force thread ends $thr_timeout->join(); #wait for the timeout thread ends Code of timeout function sub timeout { $timeout = false; my $start_time = time(); while (!$exit_thread) { sleep(1); last if (main function is executed); if (time() - $start_time >= configured time ) { logmsg "process is killed as request timed out"; _kill_remote_process(); $timeout = true; last; } } } now the code is running as i expected, but i am just not very clear if the code $exit_thread = true works because there is a "last" at the end of while loop. Can anybody give me a answer? Thanks

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• The cross-thread usage of "HttpContext.Current" property and related things

  - by smwikipedia

  I read from < Essential ASP.NET with Examples in C# the following statement: Another useful property to know about is the static Current property of the HttpContext class. This property always points to the current instance of the HttpContext class for the request being serviced. This can be convenient if you are writing helper classes that will be used from pages or other pipeline classes and may need to access the context for whatever reason. By using the static Current property to retrieve the context, you can avoid passing a reference to it to helper classes. For example, the class shown in Listing 4-1 uses the Current property of the context to access the QueryString and print something to the current response buffer. Note that for this static property to be correctly initialized, the caller must be executing on the original request thread, so if you have spawned additional threads to perform work during a request, you must take care to provide access to the context class yourself. I am wondering about the root cause of the bold part, and one thing leads to another, here is my thoughts: We know that a process can have multiple threads. Each of these threads have their own stacks, respectively. These threads also have access to a shared memory area, the heap. The stack then, as I understand it, is kind of where all the context for that thread is stored. For a thread to access something in the heap it must use a pointer, and the pointer is stored on its stack. So when we make some cross-thread calls, we must make sure that all the necessary context info is passed from the caller thread's stack to the callee thread's stack. But I am not quite sure if I made any mistake. Any comments will be deeply appreciated. Thanks. ADD Here the stack is limited to user stack.

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• Why are my thread being terminated ?

  - by Sephy

  Hi, I'm trying to repeat calls to methods through 3 differents threads. But after I start my threads, during the next iteration of my loop, they are all terminated so nothing is executed... The code is as follows : public static void main(String[] args) { main = new Main(); pollingThread.start(); } static Thread pollingThread = new Thread() { @Override public void run() { while (isRunning) { main.poll(); // test the state of the threads try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } }; }; public void poll() { if (clientThread == null) { clientThread = new Thread(new Runnable() { @Override public void run() { //create some objects } }); clientThread.start(); } else if (clientThread.isAlive()) { // do some treatment } if (gestionnaireThread == null) { gestionnaireThread = new Thread(new Runnable() { @Override public void run() { //create some objects }; }); gestionnaireThread.start(); } else if (gestionnaireThread.isAlive()) { // do some treatment } if (marchandThread == null) { marchandThread = new Thread(new Runnable() { @Override public void run() { // create some objects }; }); marchandThread.start(); } else if (marchandThread.isAlive()) { // do some treatment } } And for some reason, when I test the state of my different threads, they appear as runnable and then a the 2nd iteration, they are all terminated... What am I doing wrong? I actually have no error, but the threads are terminated and so my loop keeps looping and telling me the threads are terminated.... Thanks for any help.

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• run two thread at the same time in java

  - by user1805005

  i have used timertask to schedule my java program. now when the run method of timertask is in process, i want to run two threads which run at the same time and do different functions. here is my code.. please help me.. import java.util.Calendar; import java.util.Date; import java.util.Timer; import java.util.TimerTask; public class timercheck extends TimerTask{ // my first thread Thread t1 = new Thread(){ public void run(){ for(int i = 1;i <= 10;i++) { System.out.println(i); } } }; // my second thread Thread t2 = new Thread(){ public void run(){ for(int i = 11;i <= 20;i++) { System.out.println(i); } } }; public static void main(String[] args){ long ONCE_PER_DAY = 1000*60*60*24; Calendar calendar = Calendar.getInstance(); calendar.set(Calendar.HOUR_OF_DAY, 12); calendar.set(Calendar.MINUTE, 05); calendar.set(Calendar.SECOND, 00); Date time = calendar.getTime(); TimerTask check = new timercheck(); Timer timer = new Timer(); timer.scheduleAtFixedRate(check, time ,ONCE_PER_DAY); } @Override // run method of timer task public void run() { t1.start(); t2.start(); } }

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• How do I install the main repositories for RHEL6

  - by eisaacson

  We've setup RHEL6 on a new server. As far as we can tell, our subscription is all setup properly. However, when I run yum repolist, it doesn't show any repositories. /etc/yum.repos.d/redhat.repo is empty. I tried pasting in the content from another RHEL6 server's redhat.repo but as soon as I run yum, it wipes it out again. I just need to get the basic RedHat repositories setup so I can install packages. EDIT: Using the GUI, I went to System Administration Red Hat Subscription Manager. Under the 'Products' tab, it did not show any products. EDIT: When I run yum update, here's what I get: # yum update Loaded plugins: product-id, refresh-packagekit, security, subscription-manager This system is receiving updates from Red Hat Subscription Management. Setting up Update Process No Packages marked for Update When I log in to RedHat customer portal, it shows that subscription as active. EDIT: To make sure I wasn't having a subscription issue. I re-registered and re-subscribed. I get all the same results. # subscription-manager register --force # subscription-manager subscribe --pool=*redacted* EDIT: contents of /etc/yum.conf [main] cachedir=/var/cache/yum/$basearch/$releasever keepcache=0 debuglevel=2 logfile=/var/log/yum.log exactarch=1 obsoletes=1 gpgcheck=1 plugins=1 installonly_limit=3 contents of /etc/yum/pluginconf.d/rhnplugin.conf: [main] enabled = 0 gpgcheck = 1

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• Getting a per thread cpu stats

  - by viraptor

  I'm interested in the current usage of cpu - precisely cpu% and wait% - for each thread in a specific application. Is it possible to get that information from somewhere? I know that top can split information per real thread (ones with pid), but it doesn't show the system/user/wait cpu usage split for each of them. I would also like some way to log that info. Do you know any apps (or apis) that can do that?

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