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• Proper way to have an endless worker thread?

  - by Neil N

  I have an object that requires a lot of initialization (1-2 seconds on a beefy machine). Though once it is initialized it only takes about 20 miliseconds to do a typical "job" In order to prevent it from being re-initialized every time an app wants to use it (which could be 50 times a second or not at all for minutes in typical usage), I decided to give it a job que, and have it run on its own thread, checking to see if there is any work for it in the que. However I'm not entirely sure how to make a thread that runs indefinetly with or without work. Here's what I have so far, any critique is welcomed private void DoWork() { while (true) { if (JobQue.Count > 0) { // do work on JobQue.Pop() } else { System.Threading.Thread.Sleep(50); } } } After thought: I was thinking I may need to kill this thread gracefully insead of letting it run forever, so I think I will add a Job type that tells the thread to end. Any thoughts on how to end a thread like this also appreciated.

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• c++ thread running time

  - by chnet

  I want to know whether I can calculate the running time for each thread. I implement a multithread program in C++ using pthread. As we know, each thread will compete the CPU. Can I use clock() function to calculate the actual number of CPU clocks each thread consumes? my program looks like: Class Thread () { Start(); Run(); Computing(); }; Start() is to start multiple threads. Then each thread will run Computing function to do something. My question is how I can calculate the running time of each thread for Computing function

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• How to tell if there is an available thread in a thread pool in java

  - by Gormcito

  I am trying to proccess a queue of tasks from a database table as fast as possible while also limiting the number of threads to process the tasks. I am using a fixed sized thread pool with Executors.newFixedThreadPool(N); I want to know if there is a way of knowing if the thread pool is full, by that I mean are there currently 50 threads running, if so then I'll wait for a thread to be available before starting a new one instead of sleeping the main thread. Code of what I would like to do: ExecutorService executor = Executors.newFixedThreadPool(N); ResultSet results; while( true ) { results = getWaitingTasksStmt.executeQuery(); while( results.next() && executor.notFull() ) { executor.submit( new thread( new runnableInheritedClass(results) ) ); } }

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• Thread 0 crashed with X86 Thread State (32-bit): in cocoa Application

  - by John

  I am doing crash fixing in an osx application .The crash report shows Date/Time: 2012-05-01 16:05:58.004 +0200 OS Version: Mac OS X 10.5.8 (9L31a) Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x00000000545f5f00 Crashed Thread: 8 Thread 8 crashed with X86 Thread State (32-bit): eax: 0x140e0850 ebx: 0x00060fc8 ecx: 0x92df0ec0 edx: 0xc0000003 edi: 0x545f5f00 esi: 0x140e0870 ebp: 0xb0445988 esp: 0xb0445964 ss: 0x0000001f efl: 0x00010206 eip: 0x92dca68c cs: 0x00000017 ds: 0x0000001f es: 0x0000001f fs: 0x0000001f gs: 0x00000037 cr2: 0x545f5f00 How to tares the application code with this report? what is Thread 0 crashed with X86 Thread State (32-bit)? if anybody know please help me. Thanks in advance.

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• Java - Could not find the main class?

  - by asmo

  I'm having a hard-time with a Java error. I'm getting this when double-clicking on my compiled project Jar file in order to run it: Could not find the main class: testPackage.testFrame. Program will exit. However, my main class is cleary defined in the project properties. Furthermore, everything works fine when I run the project directly from NetBeans. I'm using the ip2c.jar third-party library to determine countries from IP addresses. If I comment the class that is using the ip2c.jar file, I don't get the error. How can a third-party library be preventing the JVM from finding my main class?

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• Catch a thread's exception in the caller thread in Python

  - by Mikee

  Hi Everyone, I'm very new to Python and multithreaded programming in general. Basically, I have a script that will copy files to another location. I would like this to be placed in another thread so I can output "...." to indicate that the script is still running. The problem that I am having is that if the files cannot be copied it will throw an exception. This is ok if running in the main thread; however, having the following code does not work: try: threadClass = TheThread(param1, param2, etc.) threadClass.start() ##### **Exception takes place here** except: print "Caught an exception" In the thread class itself, I tried to re-throw the exception, but it does not work. I have seen people on here ask similar questions, but they all seem to be doing something more specific than what I am trying to do (and I don't quite understand the solutions offered). I have seen people mention the usage of sys.exc_info(), however I do not know where or how to use it. All help is greatly appreciated! EDIT: The code for the thread class is below: class TheThread(threading.Thread): def __init__(self, sourceFolder, destFolder): threading.Thread.__init__(self) self.sourceFolder = sourceFolder self.destFolder = destFolder def run(self): try: shul.copytree(self.sourceFolder, self.destFolder) except: raise

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• Suggestions for lightweight, thread-safe scheduler

  - by nirvanai

  I am trying to write a round-robin scheduler for lightweight threads (fibers). It must scale to handle as many concurrently-scheduled fibers as possible. I also need to be able to schedule fibers from threads other than the one the run loop is on, and preferably unschedule them from arbitrary threads as well (though I could live with only being able to unschedule them from the run loop). My current idea is to have a circular doubly-linked list, where each fiber is a node and the scheduler holds a reference to the current node. This is what I have so far: using Interlocked = System.Threading.Interlocked; public class Thread { internal Future current_fiber; public void RunLoop () { while (true) { var fiber = current_fiber; if (fiber == null) { // block the thread until a fiber is scheduled continue; } if (fiber.Fulfilled) fiber.Unschedule (); else fiber.Resume (); //if (current_fiber == fiber) current_fiber = fiber.next; Interlocked.CompareExchange<Future> (ref current_fiber, fiber.next, fiber); } } } public abstract class Future { public bool Fulfilled { get; protected set; } internal Future previous, next; // this must be thread-safe // it inserts this node before thread.current_fiber // (getting the exact position doesn't matter, as long as the // chosen nodes haven't been unscheduled) public void Schedule (Thread thread) { next = this; // maintain circularity, even if this is the only node previous = this; try_again: var current = Interlocked.CompareExchange<Future> (ref thread.current_fiber, this, null); if (current == null) return; var target = current.previous; while (target == null) { // current was unscheduled; negotiate for new current_fiber var potential = current.next; var actual = Interlocked.CompareExchange<Future> (ref thread.current_fiber, potential, current); current = (actual == current? potential : actual); if (current == null) goto try_again; target = current.previous; } // I would lock "current" and "target" at this point. // How can I do this w/o risk of deadlock? next = current; previous = target; target.next = this; current.previous = this; } // this would ideally be thread-safe public void Unschedule () { var prev = previous; if (prev == null) { // already unscheduled return; } previous = null; if (next == this) { next = null; return; } // Again, I would lock "prev" and "next" here // How can I do this w/o risk of deadlock? prev.next = next; next.previous = prev; } public abstract void Resume (); } As you can see, my sticking point is that I cannot ensure the order of locking, so I can't lock more than one node without risking deadlock. Or can I? I don't want to have a global lock on the Thread object, since the amount of lock contention would be extreme. Plus, I don't especially care about insertion position, so if I lock each node separately then Schedule() could use something like Monitor.TryEnter and just keep walking the list until it finds an unlocked node. Overall, I'm not invested in any particular implementation, as long as it meets the requirements I've mentioned. Any ideas would be greatly appreciated. Thanks! P.S- For the curious, this is for an open source project I'm starting at http://github.com/nirvanai/Cirrus

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• evaluation of a java thread dump

  - by raticulin

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

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

  - by ILIA BROUDNO

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

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

  - by Tiyoal

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

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• sudo apt-get update problem

  - by Jeon

  I have a problem with sudo apt-get update that I can't seem to fix and It's causing problems with alot of installations I want to do. I run Ubuntu 12.04. Ign http://ftp.availo.se precise InRelease Ign http://ftp.availo.se precise-updates InRelease Ign http://ftp.availo.se precise-backports InRelease Ign http://ftp.availo.se precise-security InRelease Get:1 http://repository.spotify.com stable InRelease [2,979 B] Ign http://ppa.launchpad.net precise InRelease Ign http://extras.ubuntu.com precise InRelease Ign http://archive.canonical.com precise InRelease Ign http://ppa.launchpad.net precise InRelease Ign http://ppa.launchpad.net precise InRelease Ign http://repository.spotify.com stable InRelease Ign http://ftp.availo.se precise Release.gpg Ign http://ftp.availo.se precise-updates Release.gpg Ign http://ftp.availo.se precise-backports Release.gpg Ign http://repository.spotify.com stable/non-free amd64 Packages/DiffIndex Hit http://ppa.launchpad.net precise Release.gpg Hit http://ppa.launchpad.net precise Release.gpg Hit http://archive.canonical.com precise Release.gpg Hit http://extras.ubuntu.com precise Release.gpg Ign http://ftp.availo.se precise-security Release.gpg Ign http://repository.spotify.com stable/non-free i386 Packages/DiffIndex Ign http://repository.spotify.com stable/non-free TranslationIndex Hit http://ppa.launchpad.net precise Release.gpg Hit http://archive.canonical.com precise Release Hit http://extras.ubuntu.com precise Release Ign http://ftp.availo.se precise Release Ign http://ftp.availo.se precise-updates Release Hit http://ppa.launchpad.net precise Release Hit http://archive.canonical.com precise/partner amd64 Packages Hit http://extras.ubuntu.com precise/main Sources Ign http://ftp.availo.se precise-backports Release Ign http://ftp.availo.se precise-security Release Hit http://ppa.launchpad.net precise Release Hit http://archive.canonical.com precise/partner i386 Packages Ign http://archive.canonical.com precise/partner TranslationIndex Hit http://ppa.launchpad.net precise Release Hit http://extras.ubuntu.com precise/main amd64 Packages Hit http://extras.ubuntu.com precise/main i386 Packages Ign http://ftp.availo.se precise/main TranslationIndex Ign http://ftp.availo.se precise/multiverse TranslationIndex Ign http://ftp.availo.se precise/restricted TranslationIndex Hit http://ppa.launchpad.net precise/main Sources Hit http://ppa.launchpad.net precise/main amd64 Packages Hit http://ppa.launchpad.net precise/main i386 Packages Ign http://ppa.launchpad.net precise/main TranslationIndex Ign http://extras.ubuntu.com precise/main TranslationIndex Ign http://ftp.availo.se precise/universe TranslationIndex Hit http://ppa.launchpad.net precise/main Sources Hit http://ppa.launchpad.net precise/main amd64 Packages Hit http://ppa.launchpad.net precise/main i386 Packages Ign http://ppa.launchpad.net precise/main TranslationIndex Hit http://ppa.launchpad.net precise/main Sources Hit http://ppa.launchpad.net precise/main amd64 Packages Hit http://ppa.launchpad.net precise/main i386 Packages Ign http://ppa.launchpad.net precise/main TranslationIndex Ign http://ftp.availo.se precise-updates/main TranslationIndex Ign http://ftp.availo.se precise-updates/multiverse TranslationIndex Ign http://ftp.availo.se precise-updates/restricted TranslationIndex Ign http://ftp.availo.se precise-updates/universe TranslationIndex Hit http://repository.spotify.com stable/non-free amd64 Packages Ign http://ftp.availo.se precise-backports/main TranslationIndex Ign http://ftp.availo.se precise-backports/multiverse TranslationIndex Ign http://ftp.availo.se precise-backports/restricted TranslationIndex Ign http://ftp.availo.se precise-backports/universe TranslationIndex Hit http://repository.spotify.com stable/non-free i386 Packages Ign http://archive.canonical.com precise/partner Translation-en_US Ign http://ftp.availo.se precise-security/main TranslationIndex Ign http://ftp.availo.se precise-security/multiverse TranslationIndex Ign http://ftp.availo.se precise-security/restricted TranslationIndex Ign http://ftp.availo.se precise-security/universe TranslationIndex Ign http://repository.spotify.com stable/non-free Translation-en_US Ign http://archive.canonical.com precise/partner Translation-en Ign http://repository.spotify.com stable/non-free Translation-en Ign http://extras.ubuntu.com precise/main Translation-en_US Ign http://extras.ubuntu.com precise/main Translation-en Ign http://ppa.launchpad.net precise/main Translation-en_US Ign http://ppa.launchpad.net precise/main Translation-en Ign http://ppa.launchpad.net precise/main Translation-en_US Ign http://ppa.launchpad.net precise/main Translation-en Ign http://ppa.launchpad.net precise/main Translation-en_US Ign http://ppa.launchpad.net precise/main Translation-en Err http://ftp.availo.se precise/main Sources 404 Not Found Err http://ftp.availo.se precise/restricted Sources 404 Not Found Err http://ftp.availo.se precise/universe Sources 404 Not Found Err http://ftp.availo.se precise/multiverse Sources 404 Not Found Err http://ftp.availo.se precise/main amd64 Packages 404 Not Found Err http://ftp.availo.se precise/restricted amd64 Packages 404 Not Found Err http://ftp.availo.se precise/universe amd64 Packages 404 Not Found Err http://ftp.availo.se precise/multiverse amd64 Packages 404 Not Found Err http://ftp.availo.se precise/main i386 Packages 404 Not Found Err http://ftp.availo.se precise/restricted i386 Packages 404 Not Found Err http://ftp.availo.se precise/universe i386 Packages 404 Not Found Err http://ftp.availo.se precise/multiverse i386 Packages 404 Not Found Err http://ftp.availo.se precise-updates/main Sources 404 Not Found Err http://ftp.availo.se precise-updates/restricted Sources 404 Not Found Err http://ftp.availo.se precise-updates/universe Sources 404 Not Found Err http://ftp.availo.se precise-updates/multiverse Sources 404 Not Found Err http://ftp.availo.se precise-updates/main amd64 Packages 404 Not Found Err http://ftp.availo.se precise-updates/restricted amd64 Packages 404 Not Found Err http://ftp.availo.se precise-updates/universe amd64 Packages 404 Not Found Err http://ftp.availo.se precise-updates/multiverse amd64 Packages 404 Not Found Err http://ftp.availo.se precise-updates/main i386 Packages 404 Not Found Err http://ftp.availo.se precise-updates/restricted i386 Packages 404 Not Found Err http://ftp.availo.se precise-updates/universe i386 Packages 404 Not Found Err http://ftp.availo.se precise-updates/multiverse i386 Packages 404 Not Found Err http://ftp.availo.se precise-backports/main Sources 404 Not Found Err http://ftp.availo.se precise-backports/restricted Sources 404 Not Found Err http://ftp.availo.se precise-backports/universe Sources 404 Not Found Err http://ftp.availo.se precise-backports/multiverse Sources 404 Not Found Err http://ftp.availo.se precise-backports/main amd64 Packages 404 Not Found Err http://ftp.availo.se precise-backports/restricted amd64 Packages 404 Not Found Err http://ftp.availo.se precise-backports/universe amd64 Packages 404 Not Found Err http://ftp.availo.se precise-backports/multiverse amd64 Packages 404 Not Found Err http://ftp.availo.se precise-backports/main i386 Packages 404 Not Found Err http://ftp.availo.se precise-backports/restricted i386 Packages 404 Not Found Err http://ftp.availo.se precise-backports/universe i386 Packages 404 Not Found Err http://ftp.availo.se precise-backports/multiverse i386 Packages 404 Not Found Err http://ftp.availo.se precise-security/main Sources 404 Not Found Err http://ftp.availo.se precise-security/restricted Sources 404 Not Found Err http://ftp.availo.se precise-security/universe Sources 404 Not Found Err http://ftp.availo.se precise-security/multiverse Sources 404 Not Found Err http://ftp.availo.se precise-security/main amd64 Packages 404 Not Found Err http://ftp.availo.se precise-security/restricted amd64 Packages 404 Not Found Err http://ftp.availo.se precise-security/universe amd64 Packages 404 Not Found Err http://ftp.availo.se precise-security/multiverse amd64 Packages 404 Not Found Err http://ftp.availo.se precise-security/main i386 Packages 404 Not Found Err http://ftp.availo.se precise-security/restricted i386 Packages 404 Not Found Err http://ftp.availo.se precise-security/universe i386 Packages 404 Not Found Err http://ftp.availo.se precise-security/multiverse i386 Packages 404 Not Found Ign http://ftp.availo.se precise/main Translation-en_US Ign http://ftp.availo.se precise/main Translation-en Ign http://ftp.availo.se precise/multiverse Translation-en_US Ign http://ftp.availo.se precise/multiverse Translation-en Ign http://ftp.availo.se precise/restricted Translation-en_US Ign http://ftp.availo.se precise/restricted Translation-en Ign http://ftp.availo.se precise/universe Translation-en_US Ign http://ftp.availo.se precise/universe Translation-en Ign http://ftp.availo.se precise-updates/main Translation-en_US Ign http://ftp.availo.se precise-updates/main Translation-en Ign http://ftp.availo.se precise-updates/multiverse Translation-en_US Ign http://ftp.availo.se precise-updates/multiverse Translation-en Ign http://ftp.availo.se precise-updates/restricted Translation-en_US Ign http://ftp.availo.se precise-updates/restricted Translation-en Ign http://ftp.availo.se precise-updates/universe Translation-en_US Ign http://ftp.availo.se precise-updates/universe Translation-en Ign http://ftp.availo.se precise-backports/main Translation-en_US Ign http://ftp.availo.se precise-backports/main Translation-en Ign http://ftp.availo.se precise-backports/multiverse Translation-en_US Ign http://ftp.availo.se precise-backports/multiverse Translation-en Ign http://ftp.availo.se precise-backports/restricted Translation-en_US Ign http://ftp.availo.se precise-backports/restricted Translation-en Ign http://ftp.availo.se precise-backports/universe Translation-en_US Ign http://ftp.availo.se precise-backports/universe Translation-en Ign http://ftp.availo.se precise-security/main Translation-en_US Ign http://ftp.availo.se precise-security/main Translation-en Ign http://ftp.availo.se precise-security/multiverse Translation-en_US Ign http://ftp.availo.se precise-security/multiverse Translation-en Ign http://ftp.availo.se precise-security/restricted Translation-en_US Ign http://ftp.availo.se precise-security/restricted Translation-en Ign http://ftp.availo.se precise-security/universe Translation-en_US Ign http://ftp.availo.se precise-security/universe Translation-en Fetched 2,979 B in 9s (328 B/s) W: GPG error: http://repository.spotify.com stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 082CCEDF94558F59 W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/main/source/Sources 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/restricted/source/Sources 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/universe/source/Sources 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/multiverse/source/Sources 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/main/binary-amd64/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/restricted/binary-amd64/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/universe/binary-amd64/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/multiverse/binary-amd64/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/main/binary-i386/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/restricted/binary-i386/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/universe/binary-i386/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise/multiverse/binary-i386/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/main/source/Sources 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/restricted/source/Sources 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/universe/source/Sources 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/multiverse/source/Sources 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/main/binary-amd64/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/restricted/binary-amd64/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/universe/binary-amd64/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/multiverse/binary-amd64/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/main/binary-i386/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/restricted/binary-i386/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/universe/binary-i386/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-updates/multiverse/binary-i386/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/main/source/Sources 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/restricted/source/Sources 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/universe/source/Sources 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/multiverse/source/Sources 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/main/binary-amd64/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/restricted/binary-amd64/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/universe/binary-amd64/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/multiverse/binary-amd64/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/main/binary-i386/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/restricted/binary-i386/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/universe/binary-i386/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-backports/multiverse/binary-i386/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/main/source/Sources 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/restricted/source/Sources 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/universe/source/Sources 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/multiverse/source/Sources 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/main/binary-amd64/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/restricted/binary-amd64/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/universe/binary-amd64/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/multiverse/binary-amd64/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/main/binary-i386/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/restricted/binary-i386/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/universe/binary-i386/Packages 404 Not Found W: Failed to fetch http://ftp.availo.se/ubuntu/dists/precise-security/multiverse/binary-i386/Packages 404 Not Found E: Some index files failed to download. They have been ignored, or old ones used instead. I would appreciate a fix to this. Thank you for the help.

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• C# Way to name Main() method by yourself ?

  - by Chilln

  Quick question, is there a way to call your main method whatever you like ? Or does it have to be called "Main()" ?

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• main vs initialize in Ruby

  - by Dave

  Okay, so I've looked through a couple of my ruby books and done some googling to no avail. What is the difference between main and initialize in Ruby? I've seen code that uses class Blahblah def main some logic here end #more methods... end and then calls it using Blahblah.new. Isn't new reserved only for initialize? if not, then what's the difference between the two?

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• Java Beginner question about String[] args in the main method

  - by happysoul

  So I just tried excluding String[] args from the main method It compiled alright ! But JVM is showing an exception Why did it compile when String[] args HAS to be included every time ? What is going on here ? Why won't it show a compilation error ? typing this made me think that may be compiler did not see it as THE main method ..is that so ?

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• Iterate through main function in C?

  - by Mohit Deshpande

  Here is my main function: int main(int argc, char **argv) { LoadFile(); Node *temp; char *key; switch (GetUserInput()) { case 1: temp = malloc(sizeof(Node)); printf("\nEnter the key of the new node: "); scanf("%s", temp->key); printf("\nEnter the value of the new node: "); scanf("%s", temp->value); AddNode(temp); free(temp); break; case 2: key = malloc(sizeof(char *)); printf("Enter the key of the node you want to delete: "); scanf("%s", key); DeleteNode(key); free(key); break; case 3: PrintAll(); break; case 4: SaveFile(); break; case 5: return 0; break; default: printf("\nWrong choice!\n"); break; } return 0; } The only problem with it is that after any case statement breaks, the program just exits out. I understand why, but I don't know how to fix it. I want the program to repeat itself each time even after the case statements. Would I just say: main(argc, argv); before every break statement?

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• Is SecureRandom thread safe?

  - by Yishai

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

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• How a thread should close itself in Java?

  - by Roman

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

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

  - by Groxx

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

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• 12.04: Apt-Get Update: failure to fetch; can't connect to any sources

  - by weberc2

  I realize there are dozens of "apt-get update: failure to fetch" questions (I read through all I could find), but my present circumstance is unique to 12.04 and it affects all sources; not just launchpad. Additionally, I've tried several different servers in Europe and the U.S. as well as the "main server" (wherever that is) and they all yield the same result: I can't connect to any software sources. Additionally, I'm fairly certain the problem stems from the upgrade from 11.10-12.04 I performed this morning, as updates worked immediately before. Updates from the Update Manager worked fine and I could download some things (mutter) from the Software Center without incident, which makes me think I can connect to some subset of the Ubuntu servers (however, several other Ubuntu servers--like extras--and some canonical servers are listed as 'unable to connect'). Here is the output from sudo apt-get update: sudo apt-get update Ign http://ftp.u-picardie.fr precise InRelease Ign http://archive.canonical.com precise InRelease Ign http://ftp.u-picardie.fr precise-updates InRelease Ign http://ftp.u-picardie.fr precise-backports InRelease Err http://ftp.u-picardie.fr precise-security InRelease Err http://ftp.u-picardie.fr precise Release.gpg Unable to connect to ftp.u-picardie.fr:http: Err http://ftp.u-picardie.fr precise-updates Release.gpg Unable to connect to ftp.u-picardie.fr:http: Err http://ftp.u-picardie.fr precise-backports Release.gpg Unable to connect to ftp.u-picardie.fr:http: Err http://ftp.u-picardie.fr precise-security Release.gpg Unable to connect to ftp.u-picardie.fr:http: Hit http://archive.canonical.com precise Release.gpg Hit http://archive.canonical.com precise Release Hit http://archive.canonical.com precise/partner i386 Packages Ign http://archive.canonical.com precise/partner TranslationIndex Ign http://dl.google.com stable InRelease Ign http://dl.google.com stable InRelease Err http://archive.canonical.com precise/partner Translation-en_US Unable to connect to archive.canonical.com:http: [IP: 91.189.92.150 80] Err http://archive.canonical.com precise/partner Translation-en Unable to connect to archive.canonical.com:http: [IP: 91.189.92.150 80] Ign http://extras.ubuntu.com precise InRelease Get:1 http://dl.google.com stable Release.gpg [198 B] Err http://extras.ubuntu.com precise Release.gpg Could not connect to extras.ubuntu.com:80 (91.189.88.33). - connect (111: Connection refused) Ign http://ppa.launchpad.net precise InRelease Err http://ppa.launchpad.net precise InRelease Err http://ppa.launchpad.net precise InRelease Err http://ppa.launchpad.net precise InRelease Err http://ppa.launchpad.net precise InRelease Err http://ppa.launchpad.net precise InRelease Err http://ppa.launchpad.net precise InRelease Err http://ppa.launchpad.net precise InRelease Err http://ppa.launchpad.net precise InRelease Get:2 http://dl.google.com stable Release.gpg [198 B] Err http://ppa.launchpad.net precise Release.gpg Unable to connect to ppa.launchpad.net:http: Err http://ppa.launchpad.net precise Release.gpg Unable to connect to ppa.launchpad.net:http: Err http://ppa.launchpad.net precise Release.gpg Unable to connect to ppa.launchpad.net:http: Err http://ppa.launchpad.net precise Release.gpg Unable to connect to ppa.launchpad.net:http: Err http://ppa.launchpad.net precise Release.gpg Unable to connect to ppa.launchpad.net:http: Err http://ppa.launchpad.net precise Release.gpg Unable to connect to ppa.launchpad.net:http: Err http://ppa.launchpad.net precise Release.gpg Unable to connect to ppa.launchpad.net:http: Err http://ppa.launchpad.net precise Release.gpg Unable to connect to ppa.launchpad.net:http: Err http://ppa.launchpad.net precise Release.gpg Unable to connect to ppa.launchpad.net:http: Get:3 http://dl.google.com stable Release [1,347 B] Get:4 http://dl.google.com stable Release [1,347 B] Get:5 http://dl.google.com stable/main i386 Packages [1,268 B] Ign http://dl.google.com stable/main TranslationIndex Get:6 http://dl.google.com stable/main i386 Packages [769 B] Ign http://dl.google.com stable/main TranslationIndex Ign http://dl.google.com stable/main Translation-en_US Ign http://dl.google.com stable/main Translation-en Ign http://dl.google.com stable/main Translation-en_US Ign http://dl.google.com stable/main Translation-en Fetched 5,127 B in 7s (673 B/s) Reading package lists... Done W: Failed to fetch http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/dists/precise-security/InRelease W: Failed to fetch http://ppa.launchpad.net/elementary-os/stable/ubuntu/dists/precise/InRelease W: Failed to fetch http://ppa.launchpad.net/elementaryart/elementary-dev/ubuntu/dists/precise/InRelease W: Failed to fetch http://ppa.launchpad.net/midori/ppa/ubuntu/dists/precise/InRelease W: Failed to fetch http://ppa.launchpad.net/nemequ/sqlheavy/ubuntu/dists/precise/InRelease W: Failed to fetch http://ppa.launchpad.net/ricotz/docky/ubuntu/dists/precise/InRelease W: Failed to fetch http://ppa.launchpad.net/sgringwe/beatbox/ubuntu/dists/precise/InRelease W: Failed to fetch http://ppa.launchpad.net/webupd8team/y-ppa-manager/ubuntu/dists/precise/InRelease W: Failed to fetch http://ppa.launchpad.net/yorba/ppa/ubuntu/dists/precise/InRelease W: Failed to fetch http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/dists/precise/Release.gpg Unable to connect to ftp.u-picardie.fr:http: W: Failed to fetch http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/dists/precise-updates/Release.gpg Unable to connect to ftp.u-picardie.fr:http: W: Failed to fetch http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/dists/precise-backports/Release.gpg Unable to connect to ftp.u-picardie.fr:http: W: Failed to fetch http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/dists/precise-security/Release.gpg Unable to connect to ftp.u-picardie.fr:http: W: Failed to fetch http://archive.canonical.com/ubuntu/dists/precise/partner/i18n/Translation-en_US Unable to connect to archive.canonical.com:http: [IP: 91.189.92.150 80] W: Failed to fetch http://archive.canonical.com/ubuntu/dists/precise/partner/i18n/Translation-en Unable to connect to archive.canonical.com:http: [IP: 91.189.92.150 80] W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/Release.gpg Could not connect to extras.ubuntu.com:80 (91.189.88.33). - connect (111: Connection refused) W: Failed to fetch http://ppa.launchpad.net/caffeine-developers/ppa/ubuntu/dists/precise/Release.gpg Unable to connect to ppa.launchpad.net:http: W: Failed to fetch http://ppa.launchpad.net/elementary-os/stable/ubuntu/dists/precise/Release.gpg Unable to connect to ppa.launchpad.net:http: W: Failed to fetch http://ppa.launchpad.net/elementaryart/elementary-dev/ubuntu/dists/precise/Release.gpg Unable to connect to ppa.launchpad.net:http: W: Failed to fetch http://ppa.launchpad.net/midori/ppa/ubuntu/dists/precise/Release.gpg Unable to connect to ppa.launchpad.net:http: W: Failed to fetch http://ppa.launchpad.net/nemequ/sqlheavy/ubuntu/dists/precise/Release.gpg Unable to connect to ppa.launchpad.net:http: W: Failed to fetch http://ppa.launchpad.net/ricotz/docky/ubuntu/dists/precise/Release.gpg Unable to connect to ppa.launchpad.net:http: W: Failed to fetch http://ppa.launchpad.net/sgringwe/beatbox/ubuntu/dists/precise/Release.gpg Unable to connect to ppa.launchpad.net:http: W: Failed to fetch http://ppa.launchpad.net/webupd8team/y-ppa-manager/ubuntu/dists/precise/Release.gpg Unable to connect to ppa.launchpad.net:http: W: Failed to fetch http://ppa.launchpad.net/yorba/ppa/ubuntu/dists/precise/Release.gpg Unable to connect to ppa.launchpad.net:http: W: Some index files failed to download. They have been ignored, or old ones used instead. W: Duplicate sources.list entry http://ppa.launchpad.net/nemequ/sqlheavy/ubuntu/ precise/main i386 Packages (/var/lib/apt/lists/ppa.launchpad.net_nemequ_sqlheavy_ubuntu_dists_precise_main_binary-i386_Packages) W: Duplicate sources.list entry http://ppa.launchpad.net/sgringwe/beatbox/ubuntu/ precise/main i386 Packages (/var/lib/apt/lists/ppa.launchpad.net_sgringwe_beatbox_ubuntu_dists_precise_main_binary-i386_Packages) Contents of /etc/apt/sources.list: # deb cdrom:[Ubuntu 11.10 _Oneiric Ocelot_ - Release i386 (20111012)]/ oneiric main restricted deb-src http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise main restricted #Added by software-properties # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to # newer versions of the distribution. deb http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise main restricted deb-src http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise multiverse universe #Added by software-properties ## Major bug fix updates produced after the final release of the ## distribution. deb http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise-updates main restricted deb-src http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise-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://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise universe deb http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise-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://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise multiverse deb http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise-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://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise-backports main restricted universe multiverse deb-src http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise-backports main restricted universe multiverse #Added by software-properties deb http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise-security main restricted deb-src http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise-security restricted main multiverse universe #Added by software-properties deb http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise-security universe deb http://ftp.u-picardie.fr/mirror/ubuntu/ubuntu/ precise-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 precise main deb-src http://extras.ubuntu.com/ubuntu precise main Testing Alternate sources.list file These are the steps I followed to produce the following output: Please backup your sources.list: sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup and then replace the contents of /etc/apt/sources.list with the below lines and run apt-get update: deb http://archive.ubuntu.com/ubuntu/ precise main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ precise-updates main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse deb http://security.ubuntu.com/ubuntu precise-security main restricted universe multiverse deb http://archive.canonical.com/ubuntu precise partner deb http://extras.ubuntu.com/ubuntu precise main Output: someone@someone-UBook:~$ sudo apt-get update Ign http://archive.canonical.com precise InRelease Hit http://archive.canonical.com precise Release.gpg Hit http://archive.canonical.com precise Release Ign http://archive.ubuntu.com precise InRelease Ign http://extras.ubuntu.com precise InRelease Ign http://archive.ubuntu.com precise-updates InRelease Hit http://archive.canonical.com precise/partner i386 Packages Hit http://extras.ubuntu.com precise Release.gpg Ign http://archive.ubuntu.com precise-backports InRelease Ign http://archive.canonical.com precise/partner TranslationIndex Err http://archive.canonical.com precise/partner Translation-en_US Unable to connect to archive.canonical.com:http: [IP: 91.189.92.150 80] Err http://archive.canonical.com precise/partner Translation-en Unable to connect to archive.canonical.com:http: [IP: 91.189.92.150 80] Hit http://extras.ubuntu.com precise Release Get:1 http://archive.ubuntu.com precise Release.gpg [198 B] Ign http://dl.google.com stable InRelease Err http://dl.google.com stable InRelease Err http://dl.google.com stable Release.gpg Unable to connect to dl.google.com:http: [IP: 173.194.34.38 80] Err http://dl.google.com stable Release.gpg Unable to connect to dl.google.com:http: [IP: 173.194.34.38 80] Get:2 http://archive.ubuntu.com precise-updates Release.gpg [198 B] Hit http://extras.ubuntu.com precise/main i386 Packages Get:3 http://archive.ubuntu.com precise-backports Release.gpg [198 B] Ign http://security.ubuntu.com precise-security InRelease Ign http://extras.ubuntu.com precise/main TranslationIndex Err http://extras.ubuntu.com precise/main Translation-en_US Unable to connect to extras.ubuntu.com:http: Err http://extras.ubuntu.com precise/main Translation-en Unable to connect to extras.ubuntu.com:http: Get:4 http://security.ubuntu.com precise-security Release.gpg [198 B] Get:5 http://archive.ubuntu.com precise Release [49.6 kB] Get:6 http://security.ubuntu.com precise-security Release [49.6 kB] Get:7 http://archive.ubuntu.com precise-updates Release [49.6 kB] Get:8 http://archive.ubuntu.com precise-backports Release [49.6 kB] Get:9 http://security.ubuntu.com precise-security/main i386 Packages [32.9 kB] Get:10 http://archive.ubuntu.com precise/main i386 Packages [1,274 kB] Get:11 http://security.ubuntu.com precise-security/restricted i386 Packages [14 B] Get:12 http://security.ubuntu.com precise-security/universe i386 Packages [8,594 B] Get:13 http://security.ubuntu.com precise-security/multiverse i386 Packages [1,393 B] Get:14 http://security.ubuntu.com precise-security/main TranslationIndex [73 B] Get:15 http://security.ubuntu.com precise-security/multiverse TranslationIndex [71 B] Get:16 http://security.ubuntu.com precise-security/restricted TranslationIndex [70 B] Get:17 http://security.ubuntu.com precise-security/universe TranslationIndex [72 B] Get:18 http://security.ubuntu.com precise-security/main Translation-en [13.6 kB] Get:19 http://security.ubuntu.com precise-security/multiverse Translation-en [587 B] Get:20 http://security.ubuntu.com precise-security/restricted Translation-en [14 B] Get:21 http://security.ubuntu.com precise-security/universe Translation-en [6,261 B] Get:22 http://archive.ubuntu.com precise/restricted i386 Packages [8,431 B] Get:23 http://archive.ubuntu.com precise/universe i386 Packages [4,796 kB] Ign http://ppa.launchpad.net precise InRelease Ign http://ppa.launchpad.net precise InRelease Ign http://ppa.launchpad.net precise InRelease Ign http://ppa.launchpad.net precise InRelease Ign http://ppa.launchpad.net precise InRelease Ign http://ppa.launchpad.net precise InRelease Ign http://ppa.launchpad.net precise InRelease Ign http://ppa.launchpad.net precise InRelease Ign http://ppa.launchpad.net precise InRelease Ign http://ppa.launchpad.net precise InRelease Ign http://ppa.launchpad.net precise InRelease Get:24 http://ppa.launchpad.net precise Release.gpg [316 B] Get:25 http://ppa.launchpad.net precise Release.gpg [316 B] Get:26 http://ppa.launchpad.net precise Release.gpg [316 B] Ign http://ppa.launchpad.net precise Release.gpg Get:27 http://ppa.launchpad.net precise Release.gpg [316 B] Hit http://ppa.launchpad.net precise Release.gpg Get:28 http://ppa.launchpad.net precise Release.gpg [316 B] Get:29 http://ppa.launchpad.net precise Release.gpg [316 B] Hit http://ppa.launchpad.net precise Release.gpg Get:30 http://ppa.launchpad.net precise Release.gpg [316 B] Hit http://ppa.launchpad.net precise Release.gpg Get:31 http://ppa.launchpad.net precise Release [11.9 kB] Get:32 http://ppa.launchpad.net precise Release [11.9 kB] Get:33 http://archive.ubuntu.com precise/multiverse i386 Packages [121 kB] Get:34 http://ppa.launchpad.net precise Release [11.9 kB] Ign http://ppa.launchpad.net precise Release Get:35 http://ppa.launchpad.net precise Release [11.9 kB] Hit http://archive.ubuntu.com precise/main TranslationIndex Hit http://archive.ubuntu.com precise/multiverse TranslationIndex Hit http://ppa.launchpad.net precise Release Hit http://archive.ubuntu.com precise/restricted TranslationIndex Get:36 http://ppa.launchpad.net precise Release [11.9 kB] Hit http://archive.ubuntu.com precise/universe TranslationIndex Get:37 http://ppa.launchpad.net precise Release [11.9 kB] Get:38 http://archive.ubuntu.com precise-updates/main i386 Packages [96.5 kB] Hit http://ppa.launchpad.net precise Release Get:39 http://ppa.launchpad.net precise Release [11.9 kB] Get:40 http://archive.ubuntu.com precise-updates/restricted i386 Packages [770 B] Hit http://ppa.launchpad.net precise Release Get:41 http://archive.ubuntu.com precise-updates/universe i386 Packages [27.7 kB] Get:42 http://ppa.launchpad.net precise/main Sources [524 B] Get:43 http://archive.ubuntu.com precise-updates/multiverse i386 Packages [1,393 B] Get:44 http://ppa.launchpad.net precise/main i386 Packages [507 B] Hit http://archive.ubuntu.com precise-updates/main TranslationIndex Ign http://ppa.launchpad.net precise/main TranslationIndex Hit http://archive.ubuntu.com precise-updates/multiverse TranslationIndex Hit http://archive.ubuntu.com precise-updates/restricted TranslationIndex Get:45 http://ppa.launchpad.net precise/main Sources [932 B] Hit http://archive.ubuntu.com precise-updates/universe TranslationIndex Get:46 http://ppa.launchpad.net precise/main i386 Packages [1,017 B] Get:47 http://archive.ubuntu.com precise-backports/main i386 Packages [559 B] Ign http://ppa.launchpad.net precise/main TranslationIndex Get:48 http://archive.ubuntu.com precise-backports/restricted i386 Packages [14 B] Get:49 http://archive.ubuntu.com precise-backports/universe i386 Packages [1,391 B] Get:50 http://ppa.launchpad.net precise/main Sources [1,402 B] Get:51 http://archive.ubuntu.com precise-backports/multiverse i386 Packages [14 B] Hit http://archive.ubuntu.com precise-backports/main TranslationIndex Get:52 http://ppa.launchpad.net precise/main i386 Packages [1,605 B] Hit http://archive.ubuntu.com precise-backports/multiverse TranslationIndex Ign http://ppa.launchpad.net precise/main TranslationIndex Hit http://archive.ubuntu.com precise-backports/restricted TranslationIndex Hit http://archive.ubuntu.com precise-backports/universe TranslationIndex Hit http://archive.ubuntu.com precise/main Translation-en Ign http://ppa.launchpad.net precise/main TranslationIndex Hit http://archive.ubuntu.com precise/multiverse Translation-en Get:53 http://ppa.launchpad.net precise/main Sources [931 B] Hit http://archive.ubuntu.com precise/restricted Translation-en Get:54 http://ppa.launchpad.net precise/main i386 Packages [1,079 B] Hit http://archive.ubuntu.com precise/universe Translation-en Ign http://ppa.launchpad.net precise/main TranslationIndex Hit http://archive.ubuntu.com precise-updates/main Translation-en Hit http://ppa.launchpad.net precise/main Sources Hit http://archive.ubuntu.com precise-updates/multiverse Translation-en Hit http://ppa.launchpad.net precise/main i386 Packages Hit http://archive.ubuntu.com precise-updates/restricted Translation-en Ign http://ppa.launchpad.net precise/main TranslationIndex Hit http://archive.ubuntu.com precise-updates/universe Translation-en Get:55 http://ppa.launchpad.net precise/main Sources [3,611 B] Hit http://archive.ubuntu.com precise-backports/main Translation-en Get:56 http://ppa.launchpad.net precise/main i386 Packages [2,468 B] Hit http://archive.ubuntu.com precise-backports/multiverse Translation-en Ign http://ppa.launchpad.net precise/main TranslationIndex Hit http://archive.ubuntu.com precise-backports/restricted Translation-en Hit http://archive.ubuntu.com precise-backports/universe Translation-en Get:57 http://ppa.launchpad.net precise/main Sources [1,524 B] Get:58 http://ppa.launchpad.net precise/main i386 Packages [2,719 B] Ign http://ppa.launchpad.net precise/main TranslationIndex Hit http://ppa.launchpad.net precise/main Sources Hit http://ppa.launchpad.net precise/main i386 Packages Ign http://ppa.launchpad.net precise/main TranslationIndex Get:59 http://ppa.launchpad.net precise/main Sources [1,052 B] Get:60 http://ppa.launchpad.net precise/main i386 Packages [1,388 B] Ign http://ppa.launchpad.net precise/main TranslationIndex Get:61 http://ppa.launchpad.net precise/main Sources [1,185 B] Get:62 http://ppa.launchpad.net precise/main i386 Packages [1,698 B] Ign http://ppa.launchpad.net precise/main TranslationIndex Err http://ppa.launchpad.net precise/main Sources 404 Not Found Err http://ppa.launchpad.net precise/main i386 Packages 404 Not Found Ign http://ppa.launchpad.net precise/main Translation-en_US Ign http://ppa.launchpad.net precise/main Translation-en Ign http://ppa.launchpad.net precise/main Translation-en_US Ign http://ppa.launchpad.net precise/main Translation-en Ign http://ppa.launchpad.net precise/main Translation-en_US Ign http://ppa.launchpad.net precise/main Translation-en Ign http://ppa.launchpad.net precise/main Translation-en_US Ign http://ppa.launchpad.net precise/main Translation-en Ign http://ppa.launchpad.net precise/main Translation-en_US Ign http://ppa.launchpad.net precise/main Translation-en Ign http://ppa.launchpad.net precise/main Translation-en_US Ign http://ppa.launchpad.net precise/main Translation-en Ign http://ppa.launchpad.net precise/main Translation-en_US Ign http://ppa.launchpad.net precise/main Translation-en Ign http://ppa.launchpad.net precise/main Translation-en_US Ign http://ppa.launchpad.net precise/main Translation-en Ign http://ppa.launchpad.net precise/main Translation-en_US Ign http://ppa.launchpad.net precise/main Translation-en Ign http://ppa.launchpad.net precise/main Translation-en_US Ign http://ppa.launchpad.net precise/main Translation-en Ign http://ppa.launchpad.net precise/main Translation-en_US Ign http://ppa.launchpad.net precise/main Translation-en Fetched 6,699 kB in 15s (445 kB/s) Reading package lists... Done W: Failed to fetch http://dl.google.com/linux/talkplugin/deb/dists/stable/InRelease W: Failed to fetch http://archive.canonical.com/ubuntu/dists/precise/partner/i18n/Translation-en_US Unable to connect to archive.canonical.com:http: [IP: 91.189.92.150 80] W: Failed to fetch http://archive.canonical.com/ubuntu/dists/precise/partner/i18n/Translation-en Unable to connect to archive.canonical.com:http: [IP: 91.189.92.150 80] W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/sta

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

  - by Alan

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

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• Two main function

  - by user242581

  Can we have two main() functions in a C++ program?

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• Two main functions

  - by user242581

  Can we have two main() functions in a C++ program?

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• C# thread with multiple parameters

  - by Lucas B

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

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• Using EnterCriticalSection in Thread to update VCL label

  - by user257188

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

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

  - by Aly

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

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