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• Is O_LARGEFILE needed just to write a large file?

  - by Daniel Trebbien

  Is the O_LARGEFILE flag needed if all that I want to do is write a large file (O_WRONLY) or append to a large file (O_APPEND | O_WRONLY)? From a thread that I read titled "Cannot write 2gb index file" on the CLucene-dev mailing list, it appears that O_LARGEFILE might be needed to write large files, but participants in that discussion are using O_RDWR, not O_WRONLY, so I am not sure.

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• How do I find the list of functions executed to build a page?

  - by ashy_32bit

  I want the list of all functions executed to a certain point in code, somehow like debug_backtrace() but including functions not in the exact thread that leads to where debug_backtrace() is called. e.g : a(); function a() { b(); c(); d(); } function b() { } function c() { } function d() { print all_trace(); } would produce : a(), b(), c(), d() and not a(), d() like debug_backtrace() would

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• MS SQL tuning tools for finding overload

  - by SkyFox

  I use MS SQL server as a DBMS for my very big corporate DB (with different financial data). And some times my system go down. I don't understand why. What programs/tools I can use for finding process/program/thread, that overload my SQL-server? Thanks for all answers!

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• How would you name...

  - by BeowulfOF

  Since naming is a so important thing in programming, I would like to start a thread for giving help to all those that have same problems as I sometimes. Rules: Set a post with the description of the form||control||class or whatever you need to find a good name for. Get name hints in the answers.

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• Works on debug but not release

  - by user146780

  I have a thread that sets a value to true when it is done. Until then I wait: while(1) { if(done[0] == true) { break; } } This code works just fine in Debug but in Release it stays in the loop forever even though the debugger clearly says that it is true and not false. Why would this not work? Thanks

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• Why is COBOL still a preferred language in the business world?

  - by equilibrium

  Even though we have languages like C++, Java, Python etc., why is COBOL still a preferred language in the business world? EDIT: Why was it so popular? Sorry for not creating a separate thread for this question.

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• Threading heap and stack

  - by DJ

  How memory is allocated in case of spawning a new thread, i.e how memory heap, memory stack, and threads are related? I know this is fundamental (.net framework concept) but somehow I am not much aware of this concept.

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• Protected Class In C#

  - by ChloeRadshaw

  This compiles well for me - However other people on a different thread are saying that protected classes cannot be declared in c# at top level Is that the case? using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication1 { protected class CsvReader { } }

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• Prevent ListBox scrolling to top when updated

  - by WDZ

  I'm trying to build a simple music player with a ListBox playlist. When adding audio files to the playlist, it first fills the ListBox with the filenames and then (on a separate thread) extracts the ID3 data and overwrites the filenames with the correct Artist - Title information (much like Winamp). But while the ListBox is being updated, it's unscrollable, as it always jumps to the top on every item overwrite. Any way to prevent this?

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• My Android game runs out of memory when it is closed and opened and couple times.

  - by sirconnorstack

  I have an Android game that has an activity for the menu, and then another activity for the game that creates a SurfaceView and Thread to deal with canvas drawing and game logic. When you exit the game and start it up again too much or if you open and close the keyboard (thus restarting the activity), the game runs out of memory, usually when loading a bitmap: java.lang.OutOfMemoryError: bitmap size exceeds VM budget How can I keep all my images in memory without loading them again when the game changes state, or how can I release them from memory and let them reload when the game is restarted?

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• Locking individual elements in a static collection?

  - by user638474

  I have a static collection of objects that will be frequently updated from multiple threads. Is it possible to lock individual objects in a collection instead of locking the entire collection so that only threads trying to access the same object in the collection would get blocked instead of every thread? If there is a better way to update objects in a collection from multiple threads, I'm all ears.

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• C: Making golbal static variables multithread safe

  - by giladsah

  I have global static variables in a C library, which generate exceptions in a multithread run. I need to make them safe in some way (i.e. - each thread should relate to a different instance of these variables). Any recommended methods? 10x

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• C# empty statement

  - by dotnetdev

  In C#, I can write something like: using (new MyDisposableClass().MethodA()); The semicolon causes a compiler warning to be shown which states possible mistaken empty statement. I haven't run the above code but won't the method still be called? What uses is there of this type of coding convention? I saw another thread on here about this but I ask in case there areny differences now/therefore different replies. Thanks

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• Preventing threads from writing to the same file

  - by EpsilonVector

  I'm implementing an FTP-like protocol in Linux kernel 2.4 (homework), and I was under the impression that if a file is open for writing any subsequent attempt to open it by another thread should fail, until I actually tried it and discovered it goes through. How do I prevent this from happening? PS: I'm using open() to open the file.

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• C# Threading in a method

  - by user177883

  I have the following method : public List<string> someMethod() { // populate list of strings // dump them to csv file //return to output } Question is: i dont want the user to wait for csv dump, which might take a while. If i use a thread for csvdump, will it complete? before or after the return of output?

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• What's the memory overhead for a single windows threads?

  - by DayOne

  Is it 1 Mb of stack per thread? Or is that just CLR threads? I want to know the memory over head of native windows threads (c++) and CLR threads as view via Task Manager. Thanks

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• Run Jar in Background on Linux

  - by Benny

  I have a jar that runs forever (infinite loop with socket listening thread) and need it to run in the background at all times. An example would be: "java -jar test.jar" How do I do this? Thanks in advance!

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• How to implement a timer callback that executes in the same execution context

  - by Waldorf

  Some programming environments like C++ builder have timer components with a callback function which executes in the same execution contexts as where the timer object is created. I was wondering how to do something similar in plain c++ with threading. Or are there any other ways to have a callback which is periodically called to perform some task and runs in the same execution context as the calling thread?

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• simulating slow internet connection on localhost

  - by Praveen Prasad

  iam using c#,asp.net and iis, i want to simulate slow internet connection on my pc for testing my app. is it possible i can control bandwidth of iis. please dont suggest System.Threading.Thread.Sleep(someDuration); in c# file.

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• Making global static variables multithread safe

  - by giladsah

  I have global static variables in a C library, which generate exceptions in a multithread run. I need to make them safe in some way (i.e., each thread should relate to a different instance of these variables). Any recommended methods?

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• Debugging windows service without consuming code from another app

  - by dotnetdev

  Hi, Is it possible to debug a windows service or class library without consuming the code in a launchable app? There is a thread about doing this, but the techniques don't work and keep saying "Cannot start service..." as I am using a windows service. Thanks

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• Track user with log4net for a website

  - by Xstahef

  Hi, I am searching for the best way for track user on a web site based on asp.net. We are using log4net to log some business actions (enter on this page, click on button, etc.). But for multiple users, log file cannot be read easily. So I need add a property 'UserName' on the config file like this : <conversionPattern value="%date [%thread] - %property{UserName} - %-5level - %logger - %message%newline"/> Do you hae any idea about the way to set 'UserName' ? thanks for your help

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• The device is not connected exception

  - by Dani

  I try to open a large number of files but after 5000 files or so I get Exception in thread "Main" java.io.IOException: The device is not connected Is this the expected behavior? Is there a way around it? I want to leave my code as straightforward as possible.

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• Is it safe to make GL calls with multiple threads?

  - by user146780

  I was wondering if it was safe to make GL calls with multiple threads. Basically I'm using a GLUtesselator and was wondering if I could divide the objects to draw into 4 and assign a thread to each one. I'm just wondering if this would cause trouble since the tesselator uses callback functions. Can 2 threads run the same callback at the same time as long as that callback does not access ant global variables? Are there also other ways I could optimize OpenGL drawing using multithreading? Thanks

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• Running IronPython Script in C# Asynchronously

  - by Adam Haile

  In C# 4.0 and IronPython 2.6, is it possible to execute a python script in it's own thread? I would like to spawn off the script after passing in some event handler objects so that it can update the GUI as it runs.

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