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  • efficient thread-safe singleton in C++

    - by user168715
    The usual pattern for a singleton class is something like static Foo &getInst() { static Foo *inst = NULL; if(inst == NULL) inst = new Foo(...); return *inst; } However, it's my understanding that this solution is not thread-safe, since 1) Foo's constructor might be called more than once (which may or may not matter) and 2) inst may not be fully constructed before it is returned to a different thread. One solution is to wrap a mutex around the whole method, but then I'm paying for synchronization overhead long after I actually need it. An alternative is something like static Foo &getInst() { static Foo *inst = NULL; if(inst == NULL) { pthread_mutex_lock(&mutex); if(inst == NULL) inst = new Foo(...); pthread_mutex_unlock(&mutex); } return *inst; } Is this the right way to do it, or are there any pitfalls I should be aware of? For instance, are there any static initialization order problems that might occur, i.e. is inst always guaranteed to be NULL the first time getInst is called?

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  • .net thread safety

    - by george9170
    Why is locking a type considered very bad? For example, lock(typeof(DateTime)) I understand that static methods of any class in .net is considered thread safe, and that instance members are not. So it isn't necessary to lock DateTime while you are using it. The book I am reading doesn't explain why it is bad it just says it is. Any explanation will be great.

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  • Simple thread-safe non-blocking file logger class in c#

    - by Jason Renlan
    I have a web application, that will log some information to a file. I am looking for a simple thread-safe non-blocking file logger class in c#. I have little experience with threading. I known there are great logging components out there like log4Net, Enterprise Library Logging Block, ELMAH, but I do not want an external dependence for my application. I was thinking about using this queue implementation http://www.codeproject.com/KB/cpp/lockfreeq.aspx

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  • May volatile be in user defined types to help writing thread-safe code

    - by David Rodríguez - dribeas
    I know, it has been made quite clear in a couple of questions/answers before, that volatile is related to the visible state of the c++ memory model and not to multithreading. On the other hand, this article by Alexandrescu uses the volatile keyword not as a runtime feature but rather as a compile time check to force the compiler into failing to accept code that could be not thread safe. In the article the keyword is used more like a required_thread_safety tag than the actual intended use of volatile. Is this (ab)use of volatile appropriate? What possible gotchas may be hidden in the approach? The first thing that comes to mind is added confusion: volatile is not related to thread safety, but by lack of a better tool I could accept it. Basic simplification of the article: If you declare a variable volatile, only volatile member methods can be called on it, so the compiler will block calling code to other methods. Declaring an std::vector instance as volatile will block all uses of the class. Adding a wrapper in the shape of a locking pointer that performs a const_cast to release the volatile requirement, any access through the locking pointer will be allowed. Stealing from the article: template <typename T> class LockingPtr { public: // Constructors/destructors LockingPtr(volatile T& obj, Mutex& mtx) : pObj_(const_cast<T*>(&obj)), pMtx_(&mtx) { mtx.Lock(); } ~LockingPtr() { pMtx_->Unlock(); } // Pointer behavior T& operator*() { return *pObj_; } T* operator->() { return pObj_; } private: T* pObj_; Mutex* pMtx_; LockingPtr(const LockingPtr&); LockingPtr& operator=(const LockingPtr&); }; class SyncBuf { public: void Thread1() { LockingPtr<BufT> lpBuf(buffer_, mtx_); BufT::iterator i = lpBuf->begin(); for (; i != lpBuf->end(); ++i) { // ... use *i ... } } void Thread2(); private: typedef vector<char> BufT; volatile BufT buffer_; Mutex mtx_; // controls access to buffer_ };

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  • Linux's thread local storage implementation

    - by anon
    __thread Foo foo; How is "foo" actually resolved? Does the compiler silently replace every instance of "foo" with a function call? Is "foo" stored somewhere relative to the bottom of the stack, and the compiler stores this as "hey, for each thread, have this space near the bottom of the stack, and foo is stored as 'offset x from bottom of stack'"?

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  • Fast inter-thread communication mechanism

    - by Stan
    I need a fast inter-thread communication mechanism for passing work (void*) from TBB tasks to several workers which are running blocking operations. Currently I'm looking into using pipe()+libevent. Is there a faster and more elegant alternative for use with Intel Threading Building Blocks?

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  • How do I write a analyzable thread dump format

    - by gamue
    I'm creating a global exception handling which collects some information before shutting down in some cases. One of this information is the current thread dump. i do this with following code: ManagementFactory.getThreadMXBean().dumpAllThreads(true, true); The problem is to write the information into a analyzable format for TDA. Is there a "simple" way to format the information instead of writing the format on my own?

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  • C# event handlers not thread safe?

    - by Daniel
    So i've read around that instead of calling a event directly with if (SomeEvent != null) SomeEvent(this, null); i should be doing SomeEventHandler temp = SomeEvent; if (temp != null) temp(this, null); Why is this so? How does the second version become thread safe? What is the best practice?

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  • Java: thread-safe RandomAccessFile

    - by Folkert van Heusden
    Hi, After some serious googleing I found out that the RandomAccessFile-class is not thread-safe. Now I could use one semaphore to lock all reads and writes but I don't think that performs very well. In theory it should be possible to do multiple reads and one write at a time. How can I do this in Java? Is it possible at all? Thanks!

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  • Run a form in another thread

    - by Smith
    i have five forms in my c# project. one host an httplistener that i want to run continionsly. when the listener gets a message, it passes it to a static class, which in turn calls the appropriate forms for another processing. is it possible that the static class calls the new form in a new thread? if so please help me out

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  • C++ Thread level constants

    - by Gokul
    Is there a way by which we can simulate thread level constants in C++? For example, if i have to make a call to template functions, then i need to mention the constants as template level parameters? I can use static const variables for template metaprogramming, but they are process level constants. I know, i am asking a question with a high probability of 'No'. Just thought of asking this to capitalize on the very rare probability :)) Thanks, Gokul.

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  • Thread safety in C# arrays

    - by Betamoo
    Does having 2 different threads : one reading from a C# array (e.g from first location), and another one writing to the same C# array but to a different location(e.g to the last location) is thread safe or not? (And I mean here without locking reading nor writing)

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  • Problem with thread after SCREEN_OFF in Android

    - by michael
    I’m doing an application that listens to the android.intent.action.SCREEN_OFF in a Service (if that matter) and then it is supposed to wait a few seconds and launch an action, I’ve tried a timer schedule method, thread and handler postDelay method but all of them seems to fail, they are never executed on a device, it seems like it’s being freezed/killed after phone is locked. It works on emulator and on device attached to USB, but never with device working on battery only, which actually is a main scenario. Do you know any solutions to this?

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  • how a thread can signal when it's finished?

    - by Kyle
    #include <iostream> #include <boost/thread.hpp> using std::endl; using std::cout; using namespace boost; mutex running_mutex; struct dostuff { volatile bool running; dostuff() : running(true) {} void operator()(int x) { cout << "dostuff beginning " << x << endl; this_thread::sleep(posix_time::seconds(2)); cout << "dostuff is done doing stuff" << endl; mutex::scoped_lock running_lock(running_mutex); running = false; } }; bool is_running(dostuff& doer) { mutex::scoped_lock running_lock(running_mutex); return doer.running; } int main() { cout << "Begin.." << endl; dostuff doer; thread t(doer, 4); if (is_running(doer)) cout << "Cool, it's running.\n"; this_thread::sleep(posix_time::seconds(3)); if (!is_running(doer)) cout << "Cool, it's done now.\n"; else cout << "still running? why\n"; // This happens! :( return 0; } Why is the output of the above program: Begin.. Cool, it's running. dostuff beginning 4 dostuff is done doing stuff still running? why How can dostuff correctly flag when it is done? I do not want to sit around waiting for it, I just want to be notified when it's done.

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  • "Something wicked happened" error in apt-get

    - by Dragon
    Everytime I try to install through terminal I get this" I am not able to install or update and I can't find working answer for this here. Here is my apt-get update result: Hit http://ppa.launchpad.net raring Release.gpg Hit http://deb.opera.com stable Release.gpg Hit http://ppa.launchpad.net raring Release.gpg Hit http://deb.opera.com stable Release Hit http://ppa.launchpad.net raring Release Hit http://deb.opera.com stable/non-free i386 Packages Hit http://ppa.launchpad.net raring Release Hit http://ppa.launchpad.net raring/main i386 Packages Hit http://ppa.launchpad.net raring/main i386 Packages Ign http://deb.opera.com stable/non-free Translation-en_US Ign http://deb.opera.com stable/non-free Translation-en Ign http://ppa.launchpad.net raring/main Translation-en_US Ign http://ppa.launchpad.net raring/main Translation-en Ign http://ppa.launchpad.net raring/main Translation-en_US Ign http://ppa.launchpad.net raring/main Translation-en Err http://archive.ubuntu.com raring Release.gpg Something wicked happened resolving 'archive.ubuntu.com:http' (-11 - System error) Err http://extras.ubuntu.com raring Release.gpg Something wicked happened resolving 'extras.ubuntu.com:http' (-11 - System error) Err http://dl.google.com stable Release.gpg Something wicked happened resolving 'dl.google.com:http' (-11 - System error) Ign https://private-ppa.launchpad.net quantal Release.gpg Err http://archive.ubuntu.com raring-updates Release.gpg Something wicked happened resolving 'archive.ubuntu.com:http' (-11 - System error) Get:1 http://archive.ubuntu.com raring-security Release.gpg [933 B] Get:2 http://archive.ubuntu.com raring-proposed Release.gpg [933 B] Get:3 http://archive.ubuntu.com raring-backports Release.gpg [933 B] Hit http://archive.ubuntu.com raring Release Get:4 http://archive.ubuntu.com raring-updates Release [40.8 kB] Get:5 http://archive.ubuntu.com raring-security Release [40.8 kB] Ign http://extras.ubuntu.com raring Release Ign http://dl.google.com stable Release Ign https://private-ppa.launchpad.net quantal Release Get:6 http://archive.ubuntu.com raring-proposed Release [40.8 kB] Hit http://archive.ubuntu.com raring-backports Release Ign http://archive.ubuntu.com raring/main Sources/DiffIndex Ign http://archive.ubuntu.com raring/restricted Sources/DiffIndex Ign http://archive.ubuntu.com raring/universe Sources/DiffIndex Ign http://archive.ubuntu.com raring/multiverse Sources/DiffIndex Ign http://archive.ubuntu.com raring/main i386 Packages/DiffIndex Ign http://archive.ubuntu.com raring/restricted i386 Packages/DiffIndex Ign http://archive.ubuntu.com raring/universe i386 Packages/DiffIndex Ign http://archive.ubuntu.com raring/multiverse i386 Packages/DiffIndex Hit http://archive.ubuntu.com raring/main Translation-en Hit http://archive.ubuntu.com raring/multiverse Translation-en Hit http://archive.ubuntu.com raring/restricted Translation-en Ign http://dl.google.com stable/main i386 Packages/DiffIndex Hit http://archive.ubuntu.com raring/universe Translation-en Ign http://archive.ubuntu.com raring-updates/main Sources/DiffIndex Ign http://archive.ubuntu.com raring-updates/restricted Sources/DiffIndex Ign http://archive.ubuntu.com raring-updates/universe Sources/DiffIndex Ign https://private-ppa.launchpad.net quantal/main i386 Packages/DiffIndex Ign http://archive.ubuntu.com raring-updates/multiverse Sources/DiffIndex Ign http://archive.ubuntu.com raring-updates/main i386 Packages/DiffIndex Hit http://dl.google.com stable/main i386 Packages Ign http://archive.ubuntu.com raring-updates/restricted i386 Packages/DiffIndex Ign http://archive.ubuntu.com raring-updates/universe i386 Packages/DiffIndex Ign http://archive.ubuntu.com raring-updates/multiverse i386 Packages/DiffIndex Hit http://archive.ubuntu.com raring-updates/main Translation-en Hit http://archive.ubuntu.com raring-updates/multiverse Translation-en Hit http://archive.ubuntu.com raring-updates/restricted Translation-en Hit http://archive.ubuntu.com raring-updates/universe Translation-en Get:7 http://archive.ubuntu.com raring-security/main Sources [24.7 kB] Get:8 http://archive.ubuntu.com raring-security/restricted Sources [14 B] Get:9 http://archive.ubuntu.com raring-security/universe Sources [4,802 B] Get:10 http://archive.ubuntu.com raring-security/multiverse Sources [690 B] Hit https://private-ppa.launchpad.net quantal/main i386 Packages Ign http://dl.google.com stable/main Translation-en_US Get:11 http://archive.ubuntu.com raring-security/main i386 Packages [67.9 kB] Ign http://dl.google.com stable/main Translation-en Get:12 http://archive.ubuntu.com raring-security/restricted i386 Packages [14 B] Get:13 http://archive.ubuntu.com raring-security/universe i386 Packages [19.2 kB] Get:14 http://archive.ubuntu.com raring-security/multiverse i386 Packages [1,403 B] Hit http://archive.ubuntu.com raring-security/main Translation-en Ign http://extras.ubuntu.com raring/main Sources/DiffIndex Hit http://archive.ubuntu.com raring-security/multiverse Translation-en Hit http://archive.ubuntu.com raring-security/restricted Translation-en Hit http://archive.ubuntu.com raring-security/universe Translation-en Get:15 http://archive.ubuntu.com raring-proposed/universe i386 Packages [18.0 kB] Get:16 http://archive.ubuntu.com raring-proposed/main i386 Packages [29.9 kB] Get:17 http://archive.ubuntu.com raring-proposed/multiverse i386 Packages [14 B] Get:18 http://archive.ubuntu.com raring-proposed/restricted i386 Packages [14 B] Hit http://archive.ubuntu.com raring-proposed/main Translation-en Hit http://archive.ubuntu.com raring-proposed/multiverse Translation-en Hit http://archive.ubuntu.com raring-proposed/restricted Translation-en Hit http://archive.ubuntu.com raring-proposed/universe Translation-en Hit http://archive.ubuntu.com raring-backports/multiverse i386 Packages Hit http://archive.ubuntu.com raring-backports/main i386 Packages Hit http://archive.ubuntu.com raring-backports/restricted i386 Packages Hit http://archive.ubuntu.com raring-backports/universe i386 Packages Hit http://archive.ubuntu.com raring-backports/main Translation-en Ign https://private-ppa.launchpad.net quantal/main Translation-en_US Hit http://archive.ubuntu.com raring-backports/multiverse Translation-en Hit http://archive.ubuntu.com raring-backports/restricted Translation-en Hit http://archive.ubuntu.com raring-backports/universe Translation-en Hit http://archive.ubuntu.com raring/main Sources Ign https://private-ppa.launchpad.net quantal/main Translation-en Hit http://archive.ubuntu.com raring/restricted Sources Hit http://archive.ubuntu.com raring/universe Sources Hit http://archive.ubuntu.com raring/multiverse Sources Hit http://archive.ubuntu.com raring/main i386 Packages Hit http://archive.ubuntu.com raring/restricted i386 Packages Hit http://archive.ubuntu.com raring/universe i386 Packages Hit http://archive.ubuntu.com raring/multiverse i386 Packages Get:19 http://archive.ubuntu.com raring-updates/main Sources [37.0 kB] Get:20 http://archive.ubuntu.com raring-updates/restricted Sources [14 B] Get:21 http://archive.ubuntu.com raring-updates/universe Sources [49.8 kB] Ign http://extras.ubuntu.com raring/main i386 Packages/DiffIndex Get:22 http://archive.ubuntu.com raring-updates/multiverse Sources [690 B] Get:23 http://archive.ubuntu.com raring-updates/main i386 Packages [93.5 kB] Get:24 http://archive.ubuntu.com raring-updates/restricted i386 Packages [14 B] Get:25 http://archive.ubuntu.com raring-updates/universe i386 Packages [94.2 kB] Get:26 http://archive.ubuntu.com raring-updates/multiverse i386 Packages [1,403 B] Ign http://archive.ubuntu.com raring/main Translation-en_US Ign http://archive.ubuntu.com raring/multiverse Translation-en_US Ign http://archive.ubuntu.com raring/restricted Translation-en_US Ign http://archive.ubuntu.com raring/universe Translation-en_US Ign http://archive.ubuntu.com raring-updates/main Translation-en_US Ign http://archive.ubuntu.com raring-updates/multiverse Translation-en_US Ign http://archive.ubuntu.com raring-updates/restricted Translation-en_US Ign http://archive.ubuntu.com raring-updates/universe Translation-en_US Ign http://archive.ubuntu.com raring-security/main Translation-en_US Ign http://archive.ubuntu.com raring-security/multiverse Translation-en_US Ign http://archive.ubuntu.com raring-security/restricted Translation-en_US Ign http://archive.ubuntu.com raring-security/universe Translation-en_US Ign http://archive.ubuntu.com raring-proposed/main Translation-en_US Ign http://archive.ubuntu.com raring-proposed/multiverse Translation-en_US Ign http://archive.ubuntu.com raring-proposed/restricted Translation-en_US Ign http://archive.ubuntu.com raring-proposed/universe Translation-en_US Ign http://archive.ubuntu.com raring-backports/main Translation-en_US Ign http://archive.ubuntu.com raring-backports/multiverse Translation-en_US Ign http://archive.ubuntu.com raring-backports/restricted Translation-en_US Ign http://archive.ubuntu.com raring-backports/universe Translation-en_US Err http://extras.ubuntu.com raring/main Translation-en_US Something wicked happened resolving 'extras.ubuntu.com:http' (-11 - System error) Err http://extras.ubuntu.com raring/main Translation-en Something wicked happened resolving 'extras.ubuntu.com:http' (-11 - System error) Err http://extras.ubuntu.com raring/main Sources Something wicked happened resolving 'extras.ubuntu.com:http' (-11 - System error) Err http://extras.ubuntu.com raring/main i386 Packages Something wicked happened resolving 'extras.ubuntu.com:http' (-11 - System error) Fetched 568 kB in 8min 0s (1,181 B/s) W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring/Release.gpg Something wicked happened resolving 'archive.ubuntu.com:http' (-11 - System error) W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring-updates/Release.gpg Something wicked happened resolving 'archive.ubuntu.com:http' (-11 - System error) W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/raring/Release.gpg Something wicked happened resolving 'extras.ubuntu.com:http' (-11 - System error) W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg Something wicked happened resolving 'dl.google.com:http' (-11 - System error) W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/raring/main/i18n/Translation-en_US Something wicked happened resolving 'extras.ubuntu.com:http' (-11 - System error) W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/raring/main/i18n/Translation-en Something wicked happened resolving 'extras.ubuntu.com:http' (-11 - System error) W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/raring/main/source/Sources Something wicked happened resolving 'extras.ubuntu.com:http' (-11 - System error) W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/raring/main/binary-i386/Packages Something wicked happened resolving 'extras.ubuntu.com:http' (-11 - System error) E: Some index files failed to download. They have been ignored, or old ones used instead.

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  • Long running calculation on background thread

    - by SundayMonday
    In my Cocos2D game for iOS I have a relatively long running calculation that happens at a fairly regular interval (every 1-2 seconds). I'd like to run the calculation on a background thread so the main thread can keep the animation smooth. The calculation is done on a grid. Average grid size is about 100x100 where each cell stores an integer. Should I copy this grid when I pass it to the background thread? Or can I pass a reference and just make sure I don't write to the grid from the main thread before the background thread is done? Copying seems a bit wasteful but passing a reference seems risky. So I thought I'd ask.

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  • Cannot update, apt-get cannot fetch index files

    - by Evan
    I have a fresh install of Ubuntu 11.10 from the iso 'ubuntu-11.10-desktop-amd64.iso'. I installed this in VMWare Fusion 4.1.1 running on OSX 10.7.3. When setting up the VM, I allowed easy install to take care of creating my user and installing VMWare tools. No problems during installation, everything seems to be working great. The problem is that apt-get will NOT update, so I can't do software updates or install any software with apt-get install. I have been searching high and low, and have found several threads covering similar issues. How to fix a ruined package catalog? is one, Update manager generates 404 error while attempting update. Will not update is another, Ubuntu 11.10 Update issue (failed to fetch...) is a third I have tried changing my software source download location to "Main Server" rather than "Server for United States", to no avail. Same errors. Tried sudo apt-get clean, sudo apt-get autoclean, Have done a sudo rm /var/lib/apt/lists/*, still having the exact same problem. As I said, this is a brand new installation as of yesterday evening. Since I know it will be needed, here is my output from a sudo apt-get update: evan@ubuntu:~$ sudo apt-get update Ign http://archive.ubuntu.com oneiric InRelease Ign http://archive.ubuntu.com oneiric-updates InRelease Ign http://archive.ubuntu.com oneiric-backports InRelease Ign http://archive.ubuntu.com oneiric-security InRelease Ign http://archive.ubuntu.com oneiric Release.gpg Ign http://archive.ubuntu.com oneiric-updates Release.gpg Ign http://archive.ubuntu.com oneiric-backports Release.gpg Ign http://archive.ubuntu.com oneiric-security Release.gpg Ign http://archive.ubuntu.com oneiric Release Ign http://archive.ubuntu.com oneiric-updates Release Ign http://archive.ubuntu.com oneiric-backports Release Ign http://archive.ubuntu.com oneiric-security Release Ign http://archive.ubuntu.com oneiric/main TranslationIndex Ign http://archive.ubuntu.com oneiric/multiverse TranslationIndex Ign http://archive.ubuntu.com oneiric/restricted TranslationIndex Ign http://archive.ubuntu.com oneiric/universe TranslationIndex Ign http://archive.ubuntu.com oneiric-updates/main TranslationIndex Ign http://archive.ubuntu.com oneiric-updates/multiverse TranslationIndex Ign http://archive.ubuntu.com oneiric-updates/restricted TranslationIndex Ign http://archive.ubuntu.com oneiric-updates/universe TranslationIndex Ign http://archive.ubuntu.com oneiric-backports/main TranslationIndex Ign http://archive.ubuntu.com oneiric-backports/multiverse TranslationIndex Ign http://archive.ubuntu.com oneiric-backports/restricted TranslationIndex Ign http://archive.ubuntu.com oneiric-backports/universe TranslationIndex Ign http://archive.ubuntu.com oneiric-security/main TranslationIndex Ign http://archive.ubuntu.com oneiric-security/multiverse TranslationIndex Ign http://archive.ubuntu.com oneiric-security/restricted TranslationIndex Ign http://archive.ubuntu.com oneiric-security/universe TranslationIndex Err http://archive.ubuntu.com oneiric/main Sources 404 Not Found Err http://archive.ubuntu.com oneiric/restricted Sources 404 Not Found Err http://archive.ubuntu.com oneiric/universe Sources 404 Not Found Err http://archive.ubuntu.com oneiric/multiverse Sources 404 Not Found Err http://archive.ubuntu.com oneiric/main amd64 Packages 404 Not Found Err http://archive.ubuntu.com oneiric/restricted amd64 Packages 404 Not Found Err http://archive.ubuntu.com oneiric/universe amd64 Packages 404 Not Found Err http://archive.ubuntu.com oneiric/multiverse amd64 Packages 404 Not Found Err http://archive.ubuntu.com oneiric/main i386 Packages 404 Not Found Err http://archive.ubuntu.com oneiric/restricted i386 Packages 404 Not Found Err http://archive.ubuntu.com oneiric/universe i386 Packages 404 Not Found Err http://archive.ubuntu.com oneiric/multiverse i386 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-updates/main Sources 404 Not Found Err http://archive.ubuntu.com oneiric-updates/restricted Sources 404 Not Found Err http://archive.ubuntu.com oneiric-updates/universe Sources 404 Not Found Err http://archive.ubuntu.com oneiric-updates/multiverse Sources 404 Not Found Err http://archive.ubuntu.com oneiric-updates/main amd64 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-updates/restricted amd64 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-updates/universe amd64 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-updates/multiverse amd64 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-updates/main i386 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-updates/restricted i386 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-updates/universe i386 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-updates/multiverse i386 Packages 404 Not Found Ign http://extras.ubuntu.com oneiric InRelease Err http://archive.ubuntu.com oneiric-backports/main Sources 404 Not Found Err http://archive.ubuntu.com oneiric-backports/restricted Sources 404 Not Found Err http://archive.ubuntu.com oneiric-backports/universe Sources 404 Not Found Err http://archive.ubuntu.com oneiric-backports/multiverse Sources 404 Not Found Err http://archive.ubuntu.com oneiric-backports/main amd64 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-backports/restricted amd64 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-backports/universe amd64 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-backports/multiverse amd64 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-backports/main i386 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-backports/restricted i386 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-backports/universe i386 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-backports/multiverse i386 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-security/main Sources 404 Not Found Err http://archive.ubuntu.com oneiric-security/restricted Sources 404 Not Found Err http://archive.ubuntu.com oneiric-security/universe Sources 404 Not Found Err http://archive.ubuntu.com oneiric-security/multiverse Sources 404 Not Found Err http://archive.ubuntu.com oneiric-security/main amd64 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-security/restricted amd64 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-security/universe amd64 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-security/multiverse amd64 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-security/main i386 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-security/restricted i386 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-security/universe i386 Packages 404 Not Found Err http://archive.ubuntu.com oneiric-security/multiverse i386 Packages 404 Not Found Ign http://archive.ubuntu.com oneiric/main Translation-en_US Ign http://archive.ubuntu.com oneiric/main Translation-en Ign http://archive.ubuntu.com oneiric/multiverse Translation-en_US Ign http://archive.ubuntu.com oneiric/multiverse Translation-en Ign http://archive.ubuntu.com oneiric/restricted Translation-en_US Ign http://archive.ubuntu.com oneiric/restricted Translation-en Ign http://archive.ubuntu.com oneiric/universe Translation-en_US Ign http://archive.ubuntu.com oneiric/universe Translation-en Ign http://archive.ubuntu.com oneiric-updates/main Translation-en_US Ign http://archive.ubuntu.com oneiric-updates/main Translation-en Ign http://archive.ubuntu.com oneiric-updates/multiverse Translation-en_US Ign http://archive.ubuntu.com oneiric-updates/multiverse Translation-en Ign http://archive.ubuntu.com oneiric-updates/restricted Translation-en_US Ign http://archive.ubuntu.com oneiric-updates/restricted Translation-en Ign http://archive.ubuntu.com oneiric-updates/universe Translation-en_US Ign http://archive.ubuntu.com oneiric-updates/universe Translation-en Ign http://archive.ubuntu.com oneiric-backports/main Translation-en_US Ign http://archive.ubuntu.com oneiric-backports/main Translation-en Ign http://archive.ubuntu.com oneiric-backports/multiverse Translation-en_US Ign http://archive.ubuntu.com oneiric-backports/multiverse Translation-en Ign http://archive.ubuntu.com oneiric-backports/restricted Translation-en_US Ign http://archive.ubuntu.com oneiric-backports/restricted Translation-en Ign http://archive.ubuntu.com oneiric-backports/universe Translation-en_US Ign http://archive.ubuntu.com oneiric-backports/universe Translation-en Ign http://archive.ubuntu.com oneiric-security/main Translation-en_US Ign http://archive.ubuntu.com oneiric-security/main Translation-en Ign http://archive.ubuntu.com oneiric-security/multiverse Translation-en_US Ign http://archive.ubuntu.com oneiric-security/multiverse Translation-en Ign http://archive.ubuntu.com oneiric-security/restricted Translation-en_US Ign http://archive.ubuntu.com oneiric-security/restricted Translation-en Ign http://archive.ubuntu.com oneiric-security/universe Translation-en_US Ign http://archive.ubuntu.com oneiric-security/universe Translation-en Hit http://extras.ubuntu.com oneiric Release.gpg Hit http://extras.ubuntu.com oneiric Release Hit http://extras.ubuntu.com oneiric/main Sources Hit http://extras.ubuntu.com oneiric/main amd64 Packages Hit http://extras.ubuntu.com oneiric/main i386 Packages Ign http://extras.ubuntu.com oneiric/main TranslationIndex Ign http://extras.ubuntu.com oneiric/main Translation-en_US Ign http://extras.ubuntu.com oneiric/main Translation-en W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric/main/source/Sources 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric/restricted/source/Sources 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric/universe/source/Sources 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric/multiverse/source/Sources 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric/main/binary-amd64/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric/restricted/binary-amd64/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric/universe/binary-amd64/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric/multiverse/binary-amd64/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric/main/binary-i386/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric/restricted/binary-i386/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric/universe/binary-i386/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric/multiverse/binary-i386/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-updates/main/source/Sources 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-updates/restricted/source/Sources 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-updates/universe/source/Sources 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-updates/multiverse/source/Sources 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-updates/main/binary-amd64/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-updates/restricted/binary-amd64/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-updates/universe/binary-amd64/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-updates/multiverse/binary-amd64/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-updates/main/binary-i386/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-updates/restricted/binary-i386/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-updates/universe/binary-i386/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-updates/multiverse/binary-i386/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-backports/main/source/Sources 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-backports/restricted/source/Sources 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-backports/universe/source/Sources 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-backports/multiverse/source/Sources 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-backports/main/binary-amd64/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-backports/restricted/binary-amd64/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-backports/universe/binary-amd64/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-backports/multiverse/binary-amd64/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-backports/main/binary-i386/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-backports/restricted/binary-i386/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-backports/universe/binary-i386/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-backports/multiverse/binary-i386/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-security/main/source/Sources 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-security/restricted/source/Sources 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-security/universe/source/Sources 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-security/multiverse/source/Sources 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-security/main/binary-amd64/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-security/restricted/binary-amd64/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-security/universe/binary-amd64/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-security/multiverse/binary-amd64/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-security/main/binary-i386/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-security/restricted/binary-i386/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-security/universe/binary-i386/Packages 404 Not Found W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-security/multiverse/binary-i386/Packages 404 Not Found E: Some index files failed to download. They have been ignored, or old ones used instead. Here is my /etc/apt/source.list: evan@ubuntu:~$ cat /etc/apt/sources.list # deb cdrom:[Ubuntu 11.10 _Oneiric Ocelot_ - Release amd64 (20111012)]/ dists/oneiric/main/binary-i386/ # deb cdrom:[Ubuntu 11.10 _Oneiric Ocelot_ - Release amd64 (20111012)]/ oneiric 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 oneiric main restricted deb-src http://archive.ubuntu.com/ubuntu oneiric main restricted ## Major bug fix updates produced after the final release of the ## distribution. deb http://archive.ubuntu.com/ubuntu oneiric-updates main restricted deb-src http://archive.ubuntu.com/ubuntu oneiric-updates main restricted ## 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 oneiric universe deb-src http://archive.ubuntu.com/ubuntu oneiric universe deb http://archive.ubuntu.com/ubuntu oneiric-updates universe deb-src http://archive.ubuntu.com/ubuntu oneiric-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 oneiric multiverse deb-src http://archive.ubuntu.com/ubuntu oneiric multiverse deb http://archive.ubuntu.com/ubuntu oneiric-updates multiverse deb-src http://archive.ubuntu.com/ubuntu oneiric-updates multiverse ## 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://archive.ubuntu.com/ubuntu oneiric-backports main restricted universe multiverse deb-src http://archive.ubuntu.com/ubuntu oneiric-backports main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu oneiric-security main restricted deb-src http://archive.ubuntu.com/ubuntu oneiric-security main restricted deb http://archive.ubuntu.com/ubuntu oneiric-security universe deb-src http://archive.ubuntu.com/ubuntu oneiric-security universe deb http://archive.ubuntu.com/ubuntu oneiric-security multiverse deb-src http://archive.ubuntu.com/ubuntu oneiric-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 oneiric partner # deb-src http://archive.canonical.com/ubuntu oneiric 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 oneiric main deb-src http://extras.ubuntu.com/ubuntu oneiric main And here is my output from lsb_release -a: evan@ubuntu:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 11.10 Release: 11.10 Codename: oneiric If anyone could help me out here, that would be wonderful!

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  • Java - Call to start method on thread : how does it route to Runnable interface's run () ?

    - by Bhaskar
    Ok , I know the two standard ways to create a new thread and run it in Java : 1 Implement Runnable in a class , define run method ,and pass an instance of the class to a new Thread. When the start method on the thread instance is called , the run method of the class instance will be invoked. 2 Let the class derive from Thread, so it can to override the method run() and then when a new instance's start method is called , the call is routed to overridden method. In both methods , basically a new Thread object is created and its start method invoked. However , while in the second method , the mechanism of the call being routed to the user defined run() method is very clear ,( its a simple runtime polymorphism in play ), I dont understand how the call to start method on the Thread object gets routed to run() method of the class implementing Runnable interface. Does the Thread class have an private field of Type Runnable which it checks first , and if it is set then invokes the run method if it set to an object ? that would be a strange mechanism IMO. How does the call to start() on a thread get routed to the run method of the Runnable interface implemented by the class whose object is passed as a parameter when contructing the thread ?

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