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• How to fire off a asych thread in a web application, and gaurantee only 1 thread fires?

  - by Blankman

  I want to cache a object in memory. Regenerating the object when the cache expires is fairly expensive, so I want to do the following: When the cache is "about" to expire, I want to fire off a asychronous thread that will go and rebuild the object and then reset the cache. One thing I am worry about is multiple threads firing to fetch the object to cache, I only want a single thread doing this, realizing many people will be hitting the website. This might not be the best use case to do this, but I want to know how to do this sort of thing.

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• Catch unhandled exception of invisible thread

  - by user346804

  In my C++ application i use an activeX component that runs its own thread (or several I don't know). Sometimes this components throws exceptions. I would like to catch these exceptions and do recovery instead of my entire application crashing. But since I don't have access to its source code or thread I am unsure how it would be done. The only solution I can think of is to run it in its own process. Using something like CreateProcess and then CreateRemoteThread, unsure how it could be implemented. Any suggestion on how to go about solving this?

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• MS Exam 70-536 - How to throw and handle exception from thread?

  - by Max Gontar

  Hello! In MS Exam 70-536 .Net Foundation, Chapter 7 "Threading" in Lesson 1 Creating Threads there is a text: Be aware that because the WorkWithParameter method takes an object, Thread.Start could be called with any object instead of the string it expects. Being careful in choosing your starting method for a thread to deal with unknown types is crucial to good threading code. Instead of blindly casting the method parameter into our string, it is a better practice to test the type of the object, as shown in the following example: ' VB Dim info As String = o as String If info Is Nothing Then Throw InvalidProgramException("Parameter for thread must be a string") End If // C# string info = o as string; if (info == null) { throw InvalidProgramException("Parameter for thread must be a string"); } So, I've tried this but exception is not handled properly (no console exception entry, program is terminated), what is wrong with my code (below)? class Program { static void Main(string[] args) { Thread thread = new Thread(SomeWork); try { thread.Start(null); thread.Join(); } catch (InvalidProgramException ex) { Console.WriteLine(ex.Message); } finally { Console.ReadKey(); } } private static void SomeWork(Object o) { String value = (String)o; if (value == null) { throw new InvalidProgramException("Parameter for "+ "thread must be a string"); } } } Thanks for your time!

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• How to use a delay in a swing application

  - by M.R.

  I am building a swing application. At some point, I have to start an "animation": ... jpanel1.setBackground(Color.Black); Delay(milli) jpanel1.setBackground(Color.White); ... and so on. The gui itself and all the logic behind it work.It is just this time depended color-changing that does not. I have read, that swing is not thread safe, but all the examples I found showed me how to start another thread (for example in the background) but never how to stop the current swing-gui thread.

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• Mouse move and thread

  - by bsebi

  When I move the mouse over the window, the program runs much faster (cc. 3 times). This is a real time webcam .Net/Mono application running on a MacBook. On Windows works perfect. Is this maybe a power saving function of the laptop? The code: Thread t = new Thread(Foo); t.Priority = ThreadPriority.Highest; // I've tried without priority too, doesn't matter t.Start(); ... void Foo() { while (true) { ++k; // then write k to the window somehow } }

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• java.lang.OutOfMemoryError: unable to create new native thread for multiple threads

  - by Kaustubh Ranjan Singh

  static class solver implements Runnable { static calculator(problem){ //Some code if(condition) {solver s = new solver(newproblem); new Thread(s).start();} } Public solver(int newproblem) { this.problem = newproblem ; } public void run() { // TODO Auto-generated method stub calculator(promblem); } } i am having a big array maze of 100x100 and i am trying to solve it and i am getting an error java.lang.OutOfMemoryError: unable to create new native thread(after running a code for some times). How can solve this , How can i use ExecutorService i think that will solve the problem or i want something like thisIf Number of generated threads4K then stop the first 100 threads

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• Command Not working in separate thread in J2me.

  - by RishiPatel

  I am creating a bluetooth application. I created a simple midlet with a exit command and i create a thread for finding the service and discovering the device. While doing so it displays a animated screen on which i added the parent commandListener for exit command. After successful connection both user is represented with greetings(Current screen calls the parent Display method setCurrent for displaying itself). This screen also have CommandListener set to the parent. Now i want to add few more commands. I Implemented the CommandLIstener Interface in this class, added few commands but the commands are not working. I dont whats wen wrong. I am giving u Code snippets to fully describle my issue : - package name Imports here public class MyMidlet extends MIDlet implements CommandListener { public CommandListener theListener; public Display theDisplay; public Command exitCommand; public MyMidlet() { // Retrieve the display for this MIDlet //Create the initial screen } public void startApp() throws MIDletStateChangeException { } public void pauseApp() { } public void destroyApp(boolean unconditional) { } public void commandAction(Command c, Displayable d) { // Determine if the exit command was selected if (c == exitCommand) { //End application here notifyDestroyed(); } else { //Start the new thread here } } } Now here is the code for the class which is invoked by the above midlet in a separate thread; package here; imports here public class MyService implements Runnable, CommandListener { private MyMidlet parent; private StreamConnection conn; private OutputStream output; private InputStream input; public Command sendCommand; private TextField messageToSend Form form; public BChatService(boolean isServer, BChatMidlet parent) { //some stuff here this.parent = parent; } public void run() { //functino for showing animation here try { input = conn.openInputStream(); output = conn.openOutputStream(); } catch (IOException e) { displayError("IO Error", "An error occurred while opening " + "the input and output streams" + "(IOException: " + e.getMessage() + ")"); try { conn.close(); } catch (Exception ex) { } return; } // Create the Form here when service is discoverd and greets the users Command sendCommand = new Command("Send", Command.ITEM, 2); exitCommand = new Command("Exit", Command.EXIT, 1); form.addCommand(exitCommand); form.addCommand(sendCommand); parent.theDisplay.setCurrent(form); form.setCommandListener(this); public void commandAction(Command c, Displayable d) { if (c == exitCommand) { // End the game parent.destroyApp(true); parent.notifyDestroyed(); } if(c == sendCommand) { form.append("SOme text here"); } } } When i select the Send command, the string doesnt append in form neither exit command works. What can be the possible cause for it?? I need to implement this functionality...Is there any other way to achieve this??

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• Push notification or thread with timer

  - by neha

  Hi all, In my application, I'm having functionality like twitter that when you have not refreshed your screen, and if there're new messages then you get this message that "You have n new messages" and a refresh button, which on press will refresh the screen. I'm basically fetching all the data from an xml with some url. In case of thread, I need to call a timer after some time period which might affect the app performance. Can anybody please suggest wheather what will be better to use push notifications or thread with timer? Thanx in advance.

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• what is the logic behind the Thread.sleep() in java

  - by Suresh S

  Anybody know ,what is the logic behind Thread.sleep in java? . Are they using timer

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• Does thread pool size keep growing for scheduledthreadpoolexecutor?

  - by Sourajit Basak

  Imagine a situation where tasks are being added to scheduledthreadpoolexecutor. Each of these tasks will keep on running at different periodic intervals. Although all such tasks will not be running at the same time because each is set at different intervals, there may be a situation where a high number of threads are competing for execution. Is there any restriction on total number of threads ? It seems there is a restriction on the total number of idle threads. And does this concept of idle thread imply that long running tasks (thread) may be destroyed and recreated when needed ?

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• Parent Thread exiting before Child Threads [python]

  - by crgwbr

  I'm using Python in a webapp (CGI for testing, FastCGI for production) that needs to send an occasional email (when a user registers or something else important happens). Since communicating with an SMTP server takes a long time, I'd like to spawn a thread for the mail function so that the rest of the app can finish up the request without waiting for the email to finish sending. I tried using thread.start_new(func, (args)), but the Parent return's and exits before the sending is complete, thereby killing the sending process before it does anything useful. Is there anyway to keep the process alive long enough for the child process to finish?

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• Simple Thread Programming

  - by mike

  I have started to play with threads in c#, but need now help, here is my code: public partial class Form1 : Form { public Form1() { InitializeComponent(); DoCount(); } public void DoCount() { for (int i = 0; i < 100; i++) { objTextBox.Text = i.ToString(); Thread.Sleep(100); } } } its a simple win forms with a textbox, i want to see the "counting", but as you see in my code, the textbox shows me 99, it count till 99 and then shows up.. i`ll think, i have to manage this in a new thread but dont know how!

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• Handle error at non-UI thread

  - by DreamTeam Mobile

  For some reason unhandled exception which occur at non-UI thread don't handled by App_UnhandledException handler. This approach works well for Windows Phone apps to globally handle, track and analyze exceptions but doesn't work for Windows 8 apps. this.UnhandledException += App_UnhandledException; //doesn't handle private void Button_Click_1(object sender, RoutedEventArgs e) { var task = new Task(() => { throw new NullReferenceException("Test exc in UI thread"); }); task.Start(); } Please, advise.

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• Implementing Runnable vs. extending Thread

  - by abson

  Why is implementing Runnable a better option than extending from Thread class?

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• Grails background call vie camle or background-thread

  - by user304217

  I need to improve the response time for a Grails application, so I need to use concurrent processing to separate work that can be done after the users web page is refreshed It seems like the Camel and background-thread plugins can do this for me. I tried the Camel way, but get 'Session does not exists' errors, which looks like hibernate can not operate in an Camel acynchonouse call. In the background-thread description they mention that they solved this problem. Can any one tell me which which will be the better choice and which ones plays nicely with Hibernate? All the best Ulrich

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• Strange C++ thread function invocation

  - by Tony

  I have the following: class DThread { virtual void run()=0; _beginthreadex(NULL,0,tfunc,this,0,&m_UIThreadID); // class itself being passed as param to thread function... static unsigned int __stdcall tfunc(void* thisptr) { static_cast<DThread*>(thisptr)->run(); return 0; } //other stuff } The run function is implemented in a derived class. Why is the function that's being called in the thread being called through a cast this pointer? Is this good practise? Can't it just be called directly? The actual function needing to run is in the derived class. My question is

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• Application window sent behind other windows on closing different thread (C#)

  - by david.murrant

  I'm writing a Windows Forms Application in C#.NET On startup, the application displays a splash screen which is running in a separate thread. Whilst the splash screen is showing, the main application is initialising. Once the main application has finished initialising, the main form of the application is displayed, and the splash screen still shows over the top. Everything so far is as expected. Then, the Splash screen is closed, which causes that thread to exit. For some reason, at the point, the main application windows gets sent behind all other open Windows, notably the Windows Explorer window where you clicked the .exe file to run the application in the first place! What could be causing the windows to suddenly jump "behind" like this?

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• C# thread safety for class instances

  - by Steveng

  I am learning C# and I am confused with the thread safety of the copies of the class instances as below: eg: classA objA; classA objB = objA; objA.field1 = value2; //do I need lock around modification of field1? //let say we pass the objB to another thread objB.field1 = value1 //do I need a lock for objB because of the modification of field1? I am confused because coming from the background of C++, the class in C# is the reference type. If both objA and objB refer to the same memory underlying, then I would need a lock to protect the simultaneous writing to the field1. Could someone confirm with this or am I missing something? Thanks.

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• Simulators for thread scheduling on multicore

  - by shijie xu

  I am seeking a simulator for thread scheduling at multi-core architecture, that is mapping threads to the cores at runtime. During runtime, simulator collects overall cache and IPC statistics. I checked below simulators, but seems there are not sufficient for me: Simplescalar: A simulator only for single core. SESC: multiprocessor simulator with detailed power, thermal, and performance models, QSim: provides instruction-level control of the emulated environment and detailed information about the executing instruction stream. It seems both SESC and QSim supports instructions scheduling instead of thread scheduling on the cores? Anyone can help provide some clues or share experience for this part?

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• ??Data Guard???????Redo GAP

  - by JaneZhang(???)

    ?Oracle Data Guard?,Redo Gap??????????????????redo????????????,?????????redo??????????,?????????????:ARC:????MRP:Media Recovery Process,????????redoRFS:Remote File Server ,???????????redo??FAL:Fetch Archive Log????:?????????gap?,??????????gap?????:Oracle 11.2.0.2 on Linux 5.????:1.?????????????:Primary:MAX(SEQUENCE#)--------------           86Standby:MAX(SEQUENCE#)--------------           862. ??????,??gap:????????: #ifconfig eth0 down???????switch logfile:SQL>alter system switch logfile;SQL>alter system switch logfile;...Primary:MAX(SEQUENCE#)--------------           96????alert log?????????????:TNS-00513: Destination host unreachable   nt secondary err code: 101   nt OS err code: 0Error 12543 received logging on to the standbyFAL[server, ARCp]: Error 12543 creating remote archivelog file 'STANDBY'FAL[server, ARCp]: FAL archive failed, see trace file.ARCH: FAL archive failed. Archiver continuingORACLE Instance orcl - Archival Error. Archiver continuing.3.??????????????,????????????:mv *.arc ../4. ???????:#ifconfig eth0 up5.??,???ARC???????????????????MRP???gap??gap fetching.??alert log:Thu Mar 29 19:58:49 2012Media Recovery Waiting for thread 1 sequence 87 (in transit) <====  ?????,??87...Thu Mar 29 20:08:45 2012...Media Recovery Waiting for thread 1 sequence 94Thu Mar 29 20:11:01 2012RFS[61]: Assigned to RFS process 13643RFS[61]: Opened log for thread 1 sequence 97 dbid 1285401128 branch 757620395Archived Log entry 80 added for thread 1 sequence 97 rlc 757620395 ID 0x4c9d8928 dest 2:Thu Mar 29 20:11:02 2012RFS[62]: Assigned to RFS process 13645RFS[62]: Selected log 4 for thread 1 sequence 98 dbid 1285401128 branch 757620395Thu Mar 29 20:11:02 2012Primary database is in MAXIMUM PERFORMANCE modeRe-archiving standby log 4 thread 1 sequence 98Thu Mar 29 20:11:02 2012Archived Log entry 81 added for thread 1 sequence 98 ID 0x4c9d8928 dest 1:RFS[63]: Assigned to RFS process 13647RFS[63]: Selected log 4 for thread 1 sequence 99 dbid 1285401128 branch 757620395Thu Mar 29 20:11:05 2012Fetching gap sequence in thread 1, gap sequence 94-96 <===========?gap...6.??MRP?trace,?????MRP ??fetching gap:MRP trace:*** 2012-03-29 20:08:45.375 4265 krsh.cMedia Recovery Waiting for thread 1 sequence 94*** 2012-03-29 20:11:05.543*** 2012-03-29 20:11:05.543 4265 krsh.cFetching gap sequence in thread 1, gap sequence 94-96 <==========MRP?gap.Redo shipping client performing standby login*** 2012-03-29 20:11:05.593 4595 krsu.cLogged on to standby successfullyClient logon and security negotiation successful!7.????????????,???RFS????????, MRP ????????apply.Thu Mar 29 20:12:06 2012RFS[64]: Assigned to RFS process 13649RFS[64]: Opened log for thread 1 sequence 94 dbid 1285401128 branch 757620395Archived Log entry 82 added for thread 1 sequence 94 rlc 757620395 ID 0x4c9d8928 dest 2:Thu Mar 29 20:12:06 2012RFS[65]: Assigned to RFS process 13651RFS[65]: Opened log for thread 1 sequence 95 dbid 1285401128 branch 757620395Thu Mar 29 20:12:06 2012RFS[66]: Assigned to RFS process 13653RFS[66]: Opened log for thread 1 sequence 96 dbid 1285401128 branch 757620395Archived Log entry 83 added for thread 1 sequence 95 rlc 757620395 ID 0x4c9d8928 dest 2:Archived Log entry 84 added for thread 1 sequence 96 rlc 757620395 ID 0x4c9d8928 dest 2:Thu Mar 29 20:12:16 2012Media Recovery Log /home/oracle/arch1/standby/1_94_757620395.arcMedia Recovery Log /home/oracle/arch1/standby/1_95_757620395.arcMedia Recovery Log /home/oracle/arch1/standby/1_96_757620395.arcMedia Recovery Log /home/oracle/arch1/standby/1_97_757620395.arcMedia Recovery Log /home/oracle/arch1/standby/1_98_757620395.arc????:????????,????gap???,???ARC?????????gap??,????????????MRP???apply log??????gap,???????FAL????? ?:?11g,??????ARC??????RFS?MRP?????????????gap. 8. ????????MRP??FAL??gap??,????????????,??MRP?trace???:FAL[client, MRP0],?????FAL??? *** 2012-03-29 21:18:15.964 4265 krsh.cError 1031 received logging on to the standby*** 2012-03-29 21:18:15.964 4265 krsh.cFAL[client, MRP0]: Error 1031 connecting to PRIMARY for fetching gap sequence

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• Redhat 5.5: Multi-thread process only uses 1 CPU of the available 8

  - by Tonny

  Weird situation: Redhat Enterprise 5.5 (stock install, no updates, x64) on a HP z800 workstation. (Dual Xeon 2,2 Ghz. 8 cores, 16 if you count Hyper-threading. RH sees 16 cores.) We have an application that can utilize 1, 2 or 4 threads for heavy calculations. Somehow all these threads run on the same core at 100% load (the other 15 cores are nearly idle) so there is absolutely no benefit from the extra threads. In fact there is a slight slowdown as the threads get in each others way on the single core. How do I get them to run on separate cores (if possible)? Application is 64 bit. Can't change anything about the software except changing the threads setting. Is there some obscure Linux setting I can try to change? (I'm a True64 and Aix guy. I use Linux, but have no in depth knowledge of the process scheduling on Linux.)

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• Mindtouch with fcgid - Fast CGI apache worker thread.

  - by Stephan Kristyn

  Anyone got Dekiwiki / Mindtouch running with fcgid-module? I get 504 and 500 all the time. mod_fcgid: can't apply process slot for /var/www/html/dekiwiki/index.php [Tue Dec 28 06:14:03 2010] [warn] (104)Connection reset by peer: mod_fcgid: read data from fastcgi server error. [Tue Dec 28 06:14:03 2010] [error] [client 92.75.107.53] Premature end of script headers: index.php I'm currently fiddling with SuExec and fast-cgi wrapper directory permissions, because I also employ a chrooted SFTP jail. Sometimes the first line about the process slot does not appear now. I found a solution in german and will work it through now. http://debianforum.de/forum/viewtopic.php?f=8&t=122758&start=15

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• Is there a max thread per mongrel?

  - by Blankman

  I don't know much about ruby, much less how or what is involved with hosting a ruby on rails web app. BUT, I recall hearing someone saying that they have to run multiple mongrels b/c of a limit of 50 threads? Is this true (or something similiar)? Why does it have this limitation?

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• Multi Thread Rsync Transfer

  - by reefine

  For some reason when running a single rsync command I am getting 1 MB/sec to 2 MB/sec even when I connecting 2 servers both connected to 1 Gbps ports. rsync -v --progress -e ssh /backup/mysqldata/mysql-bin.000199 [email protected]:/secondary/mysqldata/mysqldata/mysql-bin.000199 I have over 800 GB of data to transfer split among 500 or so files all starting with: mysql-bin.000* I've found that running 25-30 rsync simultaneously from seperate SSH windows gets me upwards of 25 MB/sec but it will take me hours to run these all manually. Is there anyway to get the 25 MB/sec from a single rsync command?

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• Why is a single thread spread across CPU's?

  - by Marcus Lindblom

  I'm just curious why the scheduler constantly moves an app between CPUs, rather than keeping it on one. It looks a bit silly to have 4 cores at 25% rather than one at 100%. Does it has to do with heat, or is it more efficient somehow? Do other OS's do it differently? Insights or links to in-depth stuff would be nice. (Couldn't find much myself.) Update: By "spread out" I don't mean that it executes on several cpu's at once, but is being moved from one to the other several times per second, making the effect that it looks spread out.

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