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• Monitoring pthread context switching

  - by simon

  I would like to monitor the the context switching behavior in a multi-threaded pthread application. In other RTOSes(Micro C OS) I have been able to register a context switch callback for each thread in the application, and then log (or toggle a gpio) and watch the thread context switching in real time. This was a valuable tool for debugging the real time behavior and interaction of the multiple threads. My current environment is embedded linux utilizing the pthread api. Is there a way to montior each of the context switches?

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• Changing postgres user password in a master-slave setup

  - by NRS

  We have PITR setup and WAL shipping enabled. We would like to change the password for the user postgres. The process is simple enough. However, since we cannot connect to the SLAVE how would we make sure all passwords are in synch? Would temporarily disabling WAL shipping allow me to connect to the slave to change the password there? I cant seem to find documentation on a clean way to implement this password change and I don't have a test environment.

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• Silverlight 4 - encoding PCM data from the microphone

  - by Richard

  Hi I've written a basic SL4 application to capture audio data from the microphone using CaptureSource. The trouble is, it's raw PCM output - which means huge and uncompressed. Given that I need this application to run purely within a SL4 environment, how can I compress the PCM audio data into something that can be delivered to a remote server more easily? In conversation, people have suggested Speex and WMA for instance, but I haven't found any libraries or examples that work without requiring reference to DLL's that won't work in a SL4 project. Thanks, Richard.

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• I need git-svn to act as a Subversion v1.5+ client

  - by Ben Ward

  I'm running git 1.7 on Mac OSX, installed via Homebrew. I'm trying to use git svn to work with a Subversion server that requires Subversion 1.5 clients (a restriction enforced via a pre-commit hook.) Running git svn --version reveals that as far as git is concerned, git svn is equivalent to svn v1.4.4. I can't establish whether git svn is a total clone of subversion, and thus needs to be updated to meet subversion v1.5 functionality, or if git is compiled against or just points to some version of subversion under the hood. I've struggled finding anyone else trying to upgrade the version of git-svn, and I'm guessing this client version restriction is unusual, but I'm stuck with it (corporate environment.) Is it possible to have git operate as svn 1.5?

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• ORM in the realworld

  - by josh

  I am begining a new project that i think will last for some years. Am in the point of deciding the ORM framework to use (or whether to use one at all). Can anyone with experience tell me whether orm frameworks are used in realworld applications. The problem i have in mind is this: The orm tool will generate for me tables and columns etc as i create and modify my entities. However, after the project has gone live and is in production, certain database changes will not be possible. Can this hinder the advancement of the project. If i had used a framework like ibatis for example, i know i would only need to adjust the sql statements based on the database changes. Can someone tell me whether ORM tools have survived the live environment. At my office, we use java based ERP that was done long ago and it was never done using any ORM framework. Regards. Josh

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• .NET Active Directory Password Expiration on Windows 2008

  - by Brent Pabst

  Searched SO and Everywhere else, including the .net developers guide to directory services programming book - no luck. I am trying to create a simple password reset web page that allows the user to change their password. The change password portion of the code is working fine. For the users I would also like to display when their current password will expire next. Using the sample code from the book mentioned above I was able to get all of the code setup however, the attribute that is returned is always equal to Long.MinValue and hence cannot be inverted to a positive number, plus this means it did not find the proper domain setting. Does anyone have sample code or references for getting the password expiration in a Windows 2008 or R2 domain environment where password policies can be different for each user?

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• C++ project type: unicode vs multi-byte; pros and cons

  - by Stefan Valianu

  I'm wondering what the Stack Overflow community thinks when it comes to creating a project (thinking primarily c++ here) with a unicode or a multi-byte character set. Are there pros to going Unicode straight from the start, implying all your strings will be in wide format? Are there performance issues / larger memory requirements because of a standard use of a larger character? Is there an advantage to this method? Do some processor architectures handle wide characters better? Are there any reasons to make your project Unicode if you don't plan on supporting additional languages? What reasons would one have for creating a project with a multi-byte character set? How do all of the factors above collide in a high performance environment (such as a modern video game) ?

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• Query and/or Search for SharePoint Document ID

  - by Paul-Jan

  We have the sharepoint 2010 environment with Document ID's enabled. Given (part of) a Doc ID, we want to programmatically retrieve the document(s) matching that ID. The problem seems to be that this column is rather special, in that it might need special handling. Using an SPSiteDataQuery, fetching the _dlc_DocId field as part of the viewfields works fine. However, including it as part of the where query never results in any documents being fetched. Using the Search API has gotten us nowhere at all. Has anyone pulled this off, or any suggestions on how to tackle this problem? [Update] Looks like DocumentIdProvider.GetDocumentUrlsById might be used for this purpose. If necessary, the matching SPListItem can then be found by querying on the URL. However, the MSDN documentation doesn't document the documentId arugment properly, so I'm unsure whether partial ID's are allowed and in what format.

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• Best Database Change Control Methodologies

  - by SnapJag

  As a database architect, developer, and consultant, there are many questions that can be answered. One, though I was asked recently and still can't answer good, is... "What is one of, or some of, the best methods or techniques to keep database changes documented, organized, and yet able to roll out effectively either in a single-developer or multi-developer environment." This may involve stored procedures and other object scripts, but especially schemas - from documentation, to the new physical update scripts, to rollout, and then full-circle. There are applications to make this happen, but require schema hooks and overhead. I would rather like to know about techniques used without a lot of extra third-party involvement.

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• theming sencha touch error: File to import not found or unreadable: sencha-tou ch/default/all

  - by dan

  I just cant find a workarround for this, please help my config.rb in location $PROJECT_HOME/assets/www/theming dir = File.dirname('..Path_to_project_home..\assets\www\theming\config.rb') load File.join(dir, '..', 'lib', 'touch', 'resources', 'themes') sass_path = dir css_path = dir environment = :production output_style = :compressed this is my app.scss: @import 'sencha-touch/default/all'; @include sencha-panel; @include sencha-buttons; @include sencha-toolbar; @include sencha-list; @include sencha-layout; @include sencha-sheet; @include sencha-msgbox; in the console in the directory of the 'sass_path' I run compass compile app.scss but I get the following error: File to import not found or unreadable: sencha-touch/default/all. Please help, cant solve this.

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• Database Network Latency

  - by Karl

  Hi All, I am currently working on an n-tier system and battling some database performance issues. One area we have been investigating is the latency between the database server and the application server. In our test environment the average ping times between the two boxes is in the region of 0.2ms however on the clients site its more in the region of 8.2 ms. Is that somthing we should be worried about? For your average system what do you guys consider a resonable latency and how would you go about testing/measuring the latency? Karl

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• Modifying an old Windows program not to call exit after a keypress without source access

  - by rustyn2

  I have an older C++ Windows program that I've been asked to get run in a kiosk style environment for a student project. From the main menu, hitting ESC will exit the program, which is undesirable. In ye olden days I would have trapped the keyboard interrupt or whatever and dug around to NOOP whatever JMP or CALL was getting referenced in the case statement that likely decides all that, but on Windows everything goes through various registered event handlers, and I haven't done any windows internals work in about 10 years. Is there a good tool to breakpoint a program on certain WM_EVENT (WM_KEYDOWN being a prime target) messages or similar, so that I can narrow down where in the executable the check is made? I'm currently stepping back from various potential system calls made before the various thread cleanups and final exit calls but it seems like there has to be a better way to do this that I'm forgetting.

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• Performance Testing Versus Unit Testing

  - by Mystagogue

  I'm reading Osherove's "The Art of Unit Testing," and though I've not yet seen him say anything about performance testing, two thoughts still cross my mind: Performance tests generally can't be unit tests, because performance tests generally need to run for long periods of time. Performance tests generally can't be unit tests, because performance issues too often manifest at an integration or system level (or at least the logic of a single unit test needed to re-create the performance of the integration environment would be too involved to be a unit test). Particularly for the first reason stated above, I doubt it makes sense for performance tests to be handled by a unit testing framework (such as NUnit). My question is: do my findings / leanings correspond with the thoughts of the community?

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• Persist an object that is not marked as serializable

  - by lasseeskildsen

  Hi, I need to persist an object that is not marked with the serializable attribute. The object is from a 3rd party library which I cannot change. I need to store it in a persist place, like for example the file system, so the optimal solution would be to serialize the object to a file, but since it isn't marked as serializable, that is not a straight forward solution. It's a pretty complex object, which also holds a collection of other objects. Do you guys have any input on how to solve this? The code will never run in a production environment, so I'm ok with almost any solution and performance.

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• making a new opensource WebOs ?

  - by Ayman

  hello guys, trying to make a new webos for my graduation project, I'm a computer science guy, and this project will be my graduation project. two days ago i sat with ghost OS R&D operation manager and he told me it's a big project and i should not thinking in a project like this. anyway i have an experience, and i can made it using GWT and some programing languages for server side. and am gonna make it as a development environment, OS with specific API that allows any body to write an applications, or some modifications to add a 3rd party apps. i need some feedback and what about making it open-source project, what do you think guys ?

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• Memory allocation in Xvfb

  - by michael

  Hi, I have following this blog in setting Xvfb in my ubuntu environment: http://corpocrat.com/2008/08/19/how-to-install-xvfb-x11-server-in-linux-server/ So I did this: Xvfb :1 -screen 0 800x600x24& My question is does Xvfb only allocate memory during initialization? i.e. just enough for a display of 800x600x24? So as I have more and more programs (different programs or same program multiple times) display to the Xvfb , it does not allocate more memory? Thank you.

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• dynamic log4net appender name?

  - by sanjeev40084

  Let's say i have 3 smtp appenders in same log4net file whose names are: <appender name = "emailDevelopment".. /> <appender name = "emailBeta".. /> <appender name = "emailProduction".. /> Let's say i have 3 different servers(Dev, Beta, Production). Depending upon the server, i want to fire the log. In case of Development server, it would fire log from "emailDevelopment". I have a system variable in each server named "ApplicationEnvironment" whose value is Development, Beta, Production based on the server names. Now is there anyway i can setup root in log4net so that it fires email depending upon the server name. <root> <priority value="ALL" /> <appender-ref ref="email<environment name from whose appender should be used>" /> </root>

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• Cannot Access Rails Server From Outside LAN

  - by Mike

  Hello All This is my first post here. I have a rails server I'm running on a dedicated server that I have jail shell access to. I can start up a rails server and access it just fine using the text-based browser elinks running in that jail shell using both internal and public IP's. However, I cannot access the rails server from outside that chrooted environment. Does anyone have any ideas as to what might be going on? Any help would be appreciated. Thanks.

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• WCF - Compact Framework - Pull data from mobile client

  - by jagse

  Hello guys, I want to communicate xml serialized objects from the server to the client and the other way arround. Now it is (probably) easy to invoke methods from a mobile client (compact framework) using WCF, but is there a way so that the server can invoke methods on the client side or some other way to pull data from the client? I know that callback contracts are not available in the compact framework as you can see here: http://blogs.msdn.com/andrewarnottms/archive/2007/09/13/calling-wcf-services-from-netcf-3-5-using-compact-wcf-and-netcfsvcutil-exe.aspx Originally I thought of socket programming and of developing this by myself, then someone here mentioned WCF. But it seems like WCF only would work in a non mobile environment as I need callbacks. Anyone can help me with this? Is it possible to develop a two way communication with a desktop server and multiple mobile clients using WCF, or will I have to do socket programming? Thanks for any advice or any kind of help!

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• Paperclip - Stream not recognized by identify command

  - by user117046

  I'm getting a paperclip error every time that I upload an image: [paperclip] An error was received while processing: #<Paperclip::NotIdentifiedByImageMagickError: /tmp/stream20100531-1921-uvlewk-0 is not recognized by the 'identify' command.> I'm running: Ubuntu 10.04, Imagemagick 6.5.1-0 (via apt-get), Paperclip 3.2.1.1 My path to identify is 'usr/bin/identify' and have confirmed Imagemagick works via command line I've tried putting adding the path to the options, but to no avail. I've tried: Paperclip.options[:command_path] = "usr/bin" or Paperclip.options.merge!(:command_path => "/usr/bin") in environment.rb or config/initializers/paperclip.rb. Though it makes no rational sense, I also tried "usr/local/bin" since this is the default for most people. Any thoughts on getting around this? Thanks!

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• SQL Server CLR Integration to acheive Encryption/Decryption

  - by Aakash

  I have a requirement to store the data in encrypted form in database tables. I want to do it at database level but the problems I am facing: ( a) Data Type of the field should be Varbinary. ( b) Encryption is not supported by Workgroup edition ( c) Is it possible to encrypt Numeric Fields? I want to access the encrypted data in tables to fetch in views and stored procedure for some processing but due to above problems I am not able to. Here is my Environment: Development Platform - ASP.Net,.Net Framework 3.5,Visual studio 2008 Server Operating System - Windows Server 2008 Database - SQL Server 2008 Work group edition I was also thinking to adopt a different approach to resolve this issue (yet to test it's feasibility). I was just wondering if I could create a CLR function (which could take parameters to encrypt and decrypt data using Cryptography types provided in .Net framework) and use the CLR integration feature of SQL Server and call that function from stored procedure and views. I am not sure if I am thinking in right direction? Any advice on this as well please.

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• Properly handling unicode characters in Rails

  - by Gdeglin

  By default Rails allows users of our application to input non-utf8 data, such as: ¶®«¼ However when we attempt to retrieve the data from our database and render it in a template Rails incorrectly assumes that it is in UTF-8 format and throws an error. ArgumentError: invalid byte sequence in UTF-8 What is the best way to handle this? I have seen one fix that suggested sanitizing the data in every place the user can input it. However, that would involve changing a considerable amount of code and it would strip out the characters entirely. Ideally we would want some characters converted to their UTF-8 equivalents. Our environment: Ruby: 1.9.1 Rails 2.3.5 MySql Gem: 2.8.1 This is a serious and urgent problem for us so your answers are very appreciated!

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• Random blank pages on Safari when developing webapp

  - by Ali

  Hey guys, I've been experiencing a safari problem while building a web application. The screen goes completely blank (white) and refreshing won't help. Going to another page on the site gives the same problem. Then magically, after a little while, everything goes back to normal and pages are rendered correctly! This started happening around the same time that I SUSPECT my hosting automatically upgraded from PHP 5.2.x to 5.3 (all of a sudden, we got 'deprecated function' errors and the error settings and handling were unchanged) I also have to mention that this doesn't happen in our dev environment (PHP 5.2.9, Apache 2) Settings Safari 4.0.2 and the latest one (don't know the version) Server side: PHP 5.3, MySQL 5.0.90, Apache is cPanel Easy Apache v3.2.0 Does anyone know why this is happening at all, or how to fix it? I appreciate any help or pointers you might have. Thanks!

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• Invalidate (MFC) debug assertion failed error message

  - by kobac

  I've made a custom control, and when I want it to repaint on the screen I call Invalidate(), and afterwards UpdateWindow(), but i get message: debug assertion failed for a file afxwin2.inl in line 150 which is: AFXWIN_INLINE void CWnd::Invalidate(BOOL bErase) { ASSERT(::IsWindow(m_hWnd)); ::InvalidateRect(m_hWnd, NULL, bErase); } The thing is that when I run the same app in release mode, it doesn't report any message! So this clue makes me think it's about some environment configuration I should change. What do you think? Thanks.

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• How to set up jndi.properties for DataStore?

  - by FarmBoy

  I'm struggling to set connect a Java program to MySQL using JPA/Hibernate. I'm currently getting the following error when I try to call createEntityManagerFactory(): [main] ERROR org.hibernate.connection.DatasourceConnectionProvider - Could not find datasource: java:jdbc/myDataDS javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:645) at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:288) at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:325) at javax.naming.InitialContext.lookup(InitialContext.java:392) at org.hibernate.connection.DatasourceConnectionProvider.configure(DatasourceConnectionProvider.java:75) Googling seems to indicate that I need a jndi.properties file in META-INF in my classpath, but I can't seem to find any information about what that file should contain in my case.

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