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  • Mapping functions of 2D numpy arrays

    - by perimosocordiae
    I have a function foo that takes a NxM numpy array as an argument and returns a scalar value. I have a AxNxM numpy array data, over which I'd like to map foo to give me a resultant numpy array of length A. Curently, I'm doing this: result = numpy.array([foo(x) for x in data]) It works, but it seems like I'm not taking advantage of the numpy magic (and speed). Is there a better way? I've looked at numpy.vectorize, and numpy.apply_along_axis, but neither works for a function of 2D arrays. EDIT: I'm doing boosted regression on 24x24 image patches, so my AxNxM is something like 1000x24x24. What I called foo above applies a Haar-like feature to a patch (so, not terribly computationally intensive).

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  • asp.net MVC Partial Views how to initialise javascript

    - by Simon G
    Hi, I have an edit form that uses an ajax form to submit to the controller. Depending on the data submitted I redirect the user to one of two pages (by returning a partial view). Both pages rely on javascript/jquery and neither use anything common between the pages. What is the best way to initialise these javascripts on each page? I know there is the AjaxOption OnComplete but both pages are quite dynamic depending on the Model passed and I would rather keep the javascript for both pages seperate rather than having a common method. Thanks

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  • jquery stop image slider when accordian menu is closed

    - by Nik
    http://jsbin.com/emoba5/3/edit click here to view demo This accordion menu/image slider works well except - When the page loads and when all accordion menu items are closed I need it to show a single image on right. At the moment the page loads a blank picture area and when an accordion menu item is closed it just restarts that menu items picture slider. (So on page load and when all accordions are closed I need it default to an image on the right.) Some of the items only have 1 picture i.e. posture 3 you will notice when you click on it, it shows the image and then goes blank, can it just fade the image in and leave it there if there is only 1 image? Thanks to aSeptik for his help so far, feel free to make a revision of the posted code. Thanks guys Nik

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  • Excel VBA: NetworkDays Error 2015

    - by Martin
    Hi All, I have the this bit of code in a VBA class which is to workout the number of days between a property of the class (a date) and today’s date. Dim EmailDate As Date EmailDate = Me.Email.DateReceived Debug.Print EmailDate, Date Debug.Print NetworkDays(EmailDate), Date, Range("BankHolidays")) When I run it I get the following output 23/04/2010 19/05/2010 [GetMacroRegId] 'NETWORKDAYS' < [GetMacroRegId] 'NETWORKDAYS' -> '699990072' > Error 2015 I have tested it in a module, using dummy data, and get the correct answer. Can anyone see why this would be giving an error in a class? I have referenced atpvbaen.xls. Edit: I have found that when I run the code through a menu option I have created on the menu bar it fails, but when I run it via a button or through the VB Editor it works fine. Looks like it is something to do with the menu. Thanks, Martin

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  • Json select a specific item out for editing with javascript

    - by minus4
    I have the following JSon: {"DPI":"66.8213457076566", "width":"563.341067", "editable":"True", "pricecat":"6", "numpages":"2", "height":"400", "page":[{"filename":"999_9_1.jpg", "line":[{"test":"test 1",lineid:22}, {"test":"test 2",lineid:22}, {"test":"test 3",lineid:22}, {"test":"test 4",lineid:22}, {"test":"blank",lineid:22}]}, {"filename":"999_9_2.jpg", "line":[]}]}# i can do most things with lines like measurements.page[0].line[0].lineid; but what i am really stuck with is when i want to edit a specific line but i only have lineid available and not the line number in the array, for example: measurements.page[0].line[0].test = "new changed value"; however i dod not know the line number I.E 0 line[0] is there a way for me to get the line number of a line that has a lineid value of say 22 ???? and all within javascript thanks

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  • Can't get Xdebug to work on Windows 7

    - by Derek
    I installed the latest XAMPP package which includes PHP 5.3.0. I am trying to enable Xdebug, but it just won't work. Here's what I changed in the php.ini shipped with XAMPP: ; uncommented zend_extension = "X:\xampp\php\ext\php_xdebug.dll" ; added the following lines: xdebug.remote_enable=true xdebug.remote_host=localhost xdebug.remote_port=9000 xdebug.remote_handler=dbgp Apache starts fine, but when I open http://localhost/ in my browser, I get the following error If I click the Close the program button, the error message will reappear in a second as if it was in an infinite loop. I'd greatly appreciate any help in getting this to work. I am running a fresh install of Windows 7 Ultimate 64-bit. EDIT: From the result of phpinfo(): Zend Extension Build API220090626,TS,VC6 PHP Extension Build API20090626,TS,VC6 Debug Build no Thread Safety enabled

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  • WPF exception handling when launched from WinForms

    - by Sonic Soul
    so i came across this interesting article on WPF exception handling: http://srtsolutions.com/public/item/251263 it works by declaring DispatcherUnhandledException handler in xaml <application> node. but what if a WPF window is launched from win forms application? where can i declare a general exception handler? The problem is that when WPF crashes, it brings down the whole WinForms app with it. *Edit what if instead of launching the WPF window directly, i launched an "Application" which than defined a start window?? is that possible/advisable?

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  • Chrome history problem

    - by Parhs
    $("#table_exams tbody tr").click(function (event) { window.location.href="#" +$(this).attr("exam_ID"); window.location.href="/medilab/prototypes/exams/edit?examId=" + $(this).attr("exam_ID") +"&referer=" + referer; row_select(this); }); $(document).keypress(function (event) { if(event.keyCode==13) $(row_selected).trigger("click"); }); I have a little problem with this only in chrome...When user goes back chrome ignores the last href hash that my script added..but when i do a doubleclick its ok... IE and Firefox work great...

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  • CodePlex Daily Summary for Monday, November 07, 2011

    CodePlex Daily Summary for Monday, November 07, 2011Popular ReleasesGoogleMap Control: GoogleMap Control 6.0: Major design changes to the control in order to achieve better scalability and extensibility for the new features comming with GoogleMaps API. GoogleMap control switched to GoogleMaps API v3 and .NET 4.0. GoogleMap control is 100% ScriptControl now, it requires ScriptManager to be registered on the pages where and before it is used. Markers, polylines, polygons and directions were implemented as ExtenderControl, instead of being inner properties of GoogleMap control. Better perfomance. Better...WDTVHubGen - Adds Metadata, thumbnails and subtitles to WDTV Live Hubs: V2.1: Version 2.1 (click on the right) this uses V4.0 of .net Version 2.1 adds the following features: (apologize if I forget some, added a lot of little things) Manual Lookup with TV or Movie (finally huh!), you can look up a movie or TV episode directly, you can right click on anythign, and choose manual lookup, then will allow you to type anything you want to look up and it will assign it to the file you right clicked. No Rename: a very popular request, this is an option you can set so that t...Bulk Copy Test Cases Tool for Microsoft Test Manager & TFS: Bulk Copy Test Cases Tool: A while ago I had written a blog post Microsoft Test Manager Test Case Versioning on how to manage Test Cases over multiple releases which required you to manually copy test cases individually. Now there is a tool to help with the bulk copying of Test Cases that updates the Iteration field at the same time.Self-Tracking Entity Generator for WPF and Silverlight: Self-Tracking Entity Generator v 0.9.9 Update 2: Self-Tracking Entity Generator v 0.9.9 for Entity Framework 4.0. No change to the self-tracking entity generator v 0.9.9. WPF sample (SchoolSample) is updated with unit testing for both ViewModel and Model classes.SubExtractor: Release 1020: Feature: added "baseline double quotes" character to selector box Feature: added option to save SRT files as ANSI (instead of previous UTF-8 only) Feature: made "Save Sup files to Source directory" apply to both Sup and Idx source files. Fix: removed SDH text (...) or [...] that is split over 2 lines Fix: better decision-making in when to prefix a line with a '-' because SDH was removedAcDown????? - Anime&Comic Downloader: AcDown????? v3.6.1: ?? ● AcDown??????????、??????,??????????????????????,???????Acfun、Bilibili、???、???、???、Tucao.cc、SF???、?????80????,???????????、?????????。 ● AcDown???????????????????????????,???,???????????????????。 ● AcDown???????C#??,????.NET Framework 2.0??。?????"Acfun?????"。 ????32??64? Windows XP/Vista/7 ????????????? ??:????????Windows XP???,?????????.NET Framework 2.0???(x86)?.NET Framework 2.0???(x64),?????"?????????"??? ??????????????,??????????: ??"AcDown?????"????????? ?? v3.6.1?? ??.hlv...Track Folder Changes: Track Folder Changes 1.1: Fixed exception when right-clicking the root nodeKinect Toolbox: Kinect Toolbox v1.1.0.2: This version adds support for the Kinect for Windows SDK beta 2.MapWindow 4: MapWindow GIS v4.8.6 - Final release - 32Bit: This is the final release of MapWindow v4.8. It has 4.8.6 as version number. This version has been thoroughly tested. If you do get an exception send the exception to us. Don't forget to include your e-mail address. Use the forums at http://www.mapwindow.org/phorum/ for questions. Please consider donating a small portion of the money you have saved by having free GIS tools: http://www.mapwindow.org/pages/donate.php What’s New in 4.8.6 (Final release) · A few minor issues have been fixed Wha...Kinect Mouse Cursor: Kinect Mouse Cursor 1.1: Updated for Kinect for Windows SDK v1.0 Beta 2!Coding4Fun Kinect Toolkit: Coding4Fun Kinect Toolkit 1.1: Updated for Kinect for Windows SDK v1.0 Beta 2!Async Executor: 1.0: Source code of the AsyncExecutorMedia Companion: MC 3.421b Weekly: Ensure .NET 4.0 Full Framework is installed. (Available from http://www.microsoft.com/download/en/details.aspx?id=17718) Ensure the NFO ID fix is applied when transitioning from versions prior to 3.416b. (Details here) TV Show Resolutions... Fix to show the season-specials.tbn when selecting an episode from season 00. Before, MC would try & load season00.tbn Fix for issue #197 - new show added by 'Manually Add Path' not being picked up. Also made non-visible the same thing in Root Folders...Nearforums - ASP.NET MVC forum engine: Nearforums v7.0: Version 7.0 of Nearforums, the ASP.NET MVC Forum Engine, containing new features: UI: Flexible layout to handle both list and table-like template layouts. Theming - Visual choice of themes: Deliver some templates on installation, export/import functionality, preview. Allow site owners to choose default list sort order for the forums. Forum latest activity. Visit the project Roadmap for more details. Webdeploy packages sha1 checksum: e6bb913e591543ab292a753d1a16cdb779488c10?????????? - ????????: All-In-One Code Framework ??? 2011-11-02: http://download.codeplex.com/Project/Download/FileDownload.aspx?ProjectName=1codechs&DownloadId=216140 ??????,11??,?????20????Microsoft OneCode Sample,????6?Program Language Sample,2?Windows Base Sample,2?GDI+ Sample,4?Internet Explorer Sample?6?ASP.NET Sample。?????????????。 ????,?????。http://i3.codeplex.com/Project/Download/FileDownload.aspx?ProjectName=1code&DownloadId=128165 Program Language CSImageFullScreenSlideShow VBImageFullScreenSlideShow CSDynamicallyBuildLambdaExpressionWithFie...Python Tools for Visual Studio: 1.1 Alpha: We’re pleased to announce the release of Python Tools for Visual Studio 1.1 Alpha. Python Tools for Visual Studio (PTVS) is an open-source plug-in for Visual Studio which supports programming with the Python programming language. This release includes new core IDE features, a couple of new sample libraries for interacting with Kinect and Excel, and many bug fixes for issues reported since the release of 1.0. For the core IDE features we’ve added many new features which improve the basic edit...BExplorer (Better Explorer): Better Explorer 2.0.0.631 Alpha: Changelog: Added: Some new functions in ribbon Added: Possibility to choose displayed columns Added: Basic Search Fixed: Some bugs after navigation Fixed: Attempt to fix slow navigation and slow start Known issues: - BreadcrumbBar fails on some situations - Basic search not work quite well in some situations Please if anyone find bugs be kind and report them at the Issue Tracker! Thanks!DotNetNuke® Community Edition: 05.06.04: Major Highlights Fixed issue with upgrades on systems that had upgraded the Telerik library to 6.0.0 Fixed issue with Razor Host upgrade to 5.6.3 The logic for module administration checks contains incorrect logic in 1 place, opening the possibility of a user with edit permissions gaining access to functionality they should not have through a particularly crafted url Security FixesBrowsers support the ability to remember common strings such as usernames/addresses etc. Code was adde...Terminals: Version 2.0 - Beta 3 Release: Beta 3 Refresh Dont forget to backup your config files BEFORE upgrading! The team has finally put the nail into the official release date for version 2.0. As bugs are winding down on the 2.0 Roadmap we decided to push out another build - the first 2.0 Beta build. Please take time to use and abuse this release. We left logging in place, and this is a debug build so be sure to submit your logs on each bug reported, and please do report all bugs! Check the source code page on the site, th...iTuner - The iTunes Companion: iTuner 1.4.4322: Added German (unverified, apologies if incorrect) Properly source invariant resources with correct resIDs Replaced obsolete lyric providers with working providers Fix Pseudolater to correctly morph every third char Fix null reference in CatalogBaseNew ProjectsA Blog: This is a blog plus personal web page frameworkAccess 1-D Intersection: This is an Access VBA Module containing functions that allow make it easy to determine overlaps in 1-D intervals. For instance if table A contains a range of 0-7 and Table B contains a range of 5-10, the intersection is 5-7.AkismetPC: A C# implementation of the popular anti-spam plugin Akismet. There aren't many .NET versions of Akismet so I decided to write one and that can be used with .NET blog engines such as Subtext, etc.AlertMonkey: A multicast chat client that enables users to send html, images, sounds, and files to connected users. Provides specialized alert types such as lunch and happy hour, as well as channel support.Azzeton: azzetonBKWork: private project.Blue: Blue is a web application for italian baseball and softball umpires.Build Javascript Models from .Net Classes: Build JavaScript Data Models from .Net Classes automaticallycmpp: cmppCRM 2011 TreeView for Dependent Picklist: This utility will allow CRM Customizer to configure Dependent Picklist items which will be shown as TreeView control on CRM form.DirSign: DirSign is a console exe that evaluates or checks directory signature. DirSign is used to check if something in a directory tree has changed (a file date or a file size or a new or missing file). You can use DirSign in scenario where you need to check if something changed since last time but where you can't install a file system watcher.epictactics: Game for WP7Export SharePoint 2010 External List to Excel: Export SharePoint 2010 external list to Excel with custom ribbon plugin. Export current external list with selected view to office 97 - 2003 or office 2007 - 2010.Floridum: Project for a XML Database.GNU ISO8583: GISO (GNU ISO) is a tool that makes it easier to analyze ISO 8583 financial transactions and also provides a platform to create a host simulator, capable of receiving requests and sending back the responses. It’s a WinForms application and it’s developed using C#.G's Syndication Pocket: G's Syndication Pocket is simple RSS Aggregate application. This is suitable for .NET Compact Framework. I checked it on Sharp's W-ZERO3.Hatena Netfx Library: .NET Library for Hatena Services.inohigo: a programming language that was developed by inohiro.Internet Cache Examiner: Internet Cache Examiner allows Internet Explorer INDEX.DAT files to be read directly, allowing the extraction of more information than is displayed in Internet Explorer, and without being limited to viewing only the activity of the current user. It's developed in C#.Javascript to IQueryable: javascript to IQueryable is an implementation that allows to write a simple query in javascript and then execute it on the server with EntityFramework or a linq provider that implement IQueryable.kisd: Just my code, wanted to keep it safe.LUCA UI for Silverlight 4: LUCA UI is a collection of flexible layout controls for Silverlight 4. Basically, using these controls you can create the same type of user-definable UI that Visual Studio and Expression Blend have.Messenger Game - Starter Kit: Kom godt i gang med at lave spil til Messenger med dette komplette Starter Kit. Indeholder et komplet netværksspil lavet med Messenger Activity API og Silverlight.Music Keys: Music KeysMyNote: MyNoteOpen Source Data System: DataSystem is a file based database system that is thread safe. It is a dynamically generated database meaning developers can either structure it outside the application prior or development. PhotoDesktop: Create background images for your desktop using hundreds of your photos off your local computer. (coming soon - use flickr [or other RSS] feeds)SharePoint Backup Augmentation Cmdlets: The SharePoint Backup Augmentation Cmdlets (SharePointBAC) provide administrators with additional PowerShell cmdlets to complement and extend SharePoint 2010's native backup and restore capabilities. SharePointBAC makes it possible to groom backup sets, archive backups, and more.SharpClassifier: C "Classifier" is an AI software component that tries to classify instances from given evidence (if shiny then diamond). A famous example is classifying email spam, separating it from ham. SharpClassifier currently only contains a single classifier - A Bayesian Naive Classifier. Most Bayesian Naive Classifiers for C# you'll find out there only handles two classes (spam/ham), but this implementation supports any number of classses.Shell Sort Web service and Application: this is a webservice of Sorting methode. use Shell sort methode to sorthing a unsorted number, and it can give a boundary as you input this project is made by Information System students, Ma Chung University , Malang - East Java - Indonesia [url:www.Machung.ac.id] Anna Letizia & SetiawanEka Prayuda Barbiezztissa@gmail.com & setya_09@hotmail.comSistema UELS: adsfasdfSorting Number use Insertion Sort on Web Service: This program can simulate the insertion sort easily.TA_Sorted_App01: First implementation of TA_Sorted Algorithm ThinkDeeper MVC framework: ThinkDeeper MVC is a WPF MVC for .NET 3.5. Typing Game: The Nottingham Game Developer's first game.xBlog: xBlog is a project to build a simple and extensible Blog Engine based on xml and linqXNA DebugDrawer Using Spritebatch: This project serves to show how to draw lines and rectangles using XNA's Spritebatch. This project uses XNA 4.0 and C# programming languageYet another Scedule Planner: YASP - Yet another Scedule Planner

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  • Verify mail server connection programmatically in ColdFusion

    - by Sergii
    I'm using custom SMTP servers and would like to verify the connection when user enters his own server credentials. Exactly the same type of check as Adobe CF and Railo allow to do when adding mail server. Sure, this does not guarantee that delivery will be working, but at least to check that entered server/username/pass are valid. I can see one tricky way: try to send the email with cfmail and check the mail log. But I believe that it can be done with more elegant. Is there any Java library available with standard ACF/Railo distro to help me? How would I use them? Examples are highly appreciated. Thanks in advance. EDIT: Please don't be confused with Java tag present. Solution needed in CFML. Though it can use some Java libraries, if applicable.

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  • Sharing a custom datasource between Winforms and Webforms

    - by Earlz
    Hello, I'd like to create a custom datasource that is shared between a Winforms and Webforms project. This functions as a middle layer for a reporting tool(DevExpress Reporting). The Webforms project is a designer for these reports. So we want for the reports to be capable of going to the server to get data and such. So our datasource would abstract away all the communication overhead. Then, for consistency, the datasource would also run on the server for reporting, except for their would be no communication. What would be the best course of action? There doesn't seem to be such a thing as a DataSource in Winforms. Is DataSource not the thing I'm looking for? Edit: After some research, it appears that IDataAdapter may be good for my purpose. Any opinion on that?

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  • ZedGraph labels

    - by eKek0
    In ZedGraph how to show text labels for each point and in the XAxis all together? EDIT: If I do myPane.XAxis.Type = AxisType.Text; myPane.XAxis.Scale.TextLabels = array_of_string; I get labels on the XAxis like this And if I do for (int i = 0; i < myCurve.Points.Count; i++) { PointPair pt = myCurve.Points[i]; // Create a text label from the Y data value TextObj text = new TextObj(pt.Y.ToString("f0"), pt.X, pt.Y + 0.1, CoordType.AxisXYScale, AlignH.Left, AlignV.Center); text.ZOrder = ZOrder.A_InFront; text.FontSpec.Angle = 0; myPane.GraphObjList.Add(text); } I get labels on the curve, like this But if I do both at the same time, labels on the curve disappear. Is there a way to combine both kind of labels?

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  • Silverlight project builds in VS2008 but fails when using MSBuild

    - by Tom
    Hi, We have 2 Silverlight projects in the same solution; SLGlobalResource and SLData. SLData references SLGlobalResource (using references add reference projects). When we build it in debug within VS2008, everything builds fine and all is good. But when we build it using: msbuild TheSolution.sln /p:Configuration=Debug /t:rebuild SLData fails with the following error: ViewModels\ImportViewModel.cs : error CS0246: The type of name space "SLGlobalResource" could not be found (are you missing a using directive or an assembly reference?) This also happens in TeamCity (I guess because the TeamCity vs2008 runner uses MSBuild) Any ideas? Thanks Edit: There are actually 33 projects in total in the solution. I didn't think this was relevant before but now I'm thinking it could be - could this be a build order thing?

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  • Could not load ruby textmate?

    - by mchenja
    I have a MacBook Pro, running Mavericks, but I'm not too acquainted with its inner workings. I'm just a humble CS student. After install Ruby 1.9.3 and Rails 4.0.0, I get this annoying message every time I open a new terminal window: Unknown ruby interpreter version (do not know how to handle): textmate. Could not load ruby textmate. The message is in bright red, so it worries me. What can I do to fix it/get rid of it? Thanks! EDIT: As it turns out, the message stopped showing, but I can't recall what I did to make it stop. In any case - thanks for reading!

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  • Use same project to create multiple applications on same device

    - by Mark.Prof
    I am deploying a reader application with it's document packaged in the asset folder. Any branding is done by dynamically generating xml and resources as appropriate. The application name itself is also generated. Since it is the tag's "package" property that needs to be unique, I nevertheless have a problem installing more than one instance of this app. I would like to dynamically edit the manifest package attribute's value to reflect the document and brand that I am building. But this causes build problems, specifically the location of R.java is no longer available to the component package under which the code resides. Originally, the component package is the same as the application manifest package. But precisely this manifest package name is the part that needs to be variable. How should I best proceed?

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  • macro returning length of arguments in C

    - by anon
    Is it possible to write a C macro that returns the length of its arguments? I want something that does: foo(1) -> 1 foo(cat, dog) -> 2 foo(red, green, blue) -> 3 Even better if this macro can be defined in such a way that it works with ## so that foo(1) -> bar1(1) foo(cat, dog) -> bar2(cat, dog) foo(red, green, blue) -> car3(red, green, blue) Thanks! EDIT: I really want a macro, not a function. Suggestions to use functions will be downvoted.

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  • How to define GPS module in Android?

    - by Osama Gamal
    I'm porting android to Devkit8000 which is a BeagleBoard clone. I have a GPS module connected on /dev/ttyS0. I could successfully get NMEA output when writing "cat /dev/ttyS0" in the terminal emulator. I want to know how to let android know that there is a GPS module on /dev/ttyS0 and it is outputting NMEA standard? To be able to use the android.location class with it! Is there something to edit in the android's source? adding driver for example, writing a code with android-ndk or what?

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  • prototype/javascript - firefox not firing keypress/keydown event unless focus is in textbox

    - by Chloraphil
    The following works fine on IE6, IE7, and chrome. Not working on ff 3.0.7. <html><head> <script src="prototype.js" type="text/javascript" ></script> <script type="text/javascript"> Event.observe(window, 'load', function(){ Event.observe(document.body, 'keydown', myEventHandler); alert('window load'); }); function myEventHandler(evt) { alert(evt); } </script> </head> <body > <input type="text" /><br><br> </body></html> EDIT: By "not working" I mean myEventHandler is not firing in firefox. EDIT2: Furthermore, it works fine when focus is on the input element. I want it fire for all keydowns.

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  • Update DataBase on clicking in button, after editing gridview (not automatically saving in DB, but a

    - by gaponte69
    0 vote down star I am using GridView in asp .net and editing data with edit command field property (as we know after updating the edited row, we automatically update the database), and I want to use transactions (with begin to commit statement - including rollback) to commit this update query in database, after clicking in some button (after some events for example), not automatically to insert or update the edited data from grid directly to the DB...so I want to save them somewhere temporary (even many edited rows - not just one row) and then to confirm the transaction - to update the real tables in database... Any suggestions are welcomed... I've used some good links, but very helpful, like: http://www.asp.net/learn/data-access/tutorial-63-cs.aspx http://www.asp.net/learn/data-access/tutorial-66-cs.aspx etc... etc...

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  • Is it ever a bad idea to publish a sitemap for a blog?

    - by mipadi
    I have a blog, and I have been considering publishing a sitemap for it, which would include the index page, archives page, and an entry for each individual blog post. Is this ever a bad idea? Is it a good (or useful) idea? I'm particularly interested in the <changefreq> element: I edit posts from time to time, and while that's not a common occurrence, I don't want to set a particularly infrequent change frequency that prevents search engines like Google from indexing the edits. (The sitemaps protocol says that search engines may still crawl the pages more frequently, but has no further details on the matter.)

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  • Modelling boost::Lockable with semaphore rather than mutex (previously titled: Unlocking a mutex fr

    - by dan
    I'm using the C++ boost::thread library, which in my case means I'm using pthreads. Officially, a mutex must be unlocked from the same thread which locks it, and I want the effect of being able to lock in one thread and then unlock in another. There are many ways to accomplish this. One possibility would be to write a new mutex class which allows this behavior. For example: class inter_thread_mutex{ bool locked; boost::mutex mx; boost::condition_variable cv; public: void lock(){ boost::unique_lock<boost::mutex> lck(mx); while(locked) cv.wait(lck); locked=true; } void unlock(){ { boost::lock_guard<boost::mutex> lck(mx); if(!locked) error(); locked=false; } cv.notify_one(); } // bool try_lock(); void error(); etc. } I should point out that the above code doesn't guarantee FIFO access, since if one thread calls lock() while another calls unlock(), this first thread may acquire the lock ahead of other threads which are waiting. (Come to think of it, the boost::thread documentation doesn't appear to make any explicit scheduling guarantees for either mutexes or condition variables). But let's just ignore that (and any other bugs) for now. My question is, if I decide to go this route, would I be able to use such a mutex as a model for the boost Lockable concept. For example, would anything go wrong if I use a boost::unique_lock< inter_thread_mutex for RAII-style access, and then pass this lock to boost::condition_variable_any.wait(), etc. On one hand I don't see why not. On the other hand, "I don't see why not" is usually a very bad way of determining whether something will work. The reason I ask is that if it turns out that I have to write wrapper classes for RAII locks and condition variables and whatever else, then I'd rather just find some other way to achieve the same effect. EDIT: The kind of behavior I want is basically as follows. I have an object, and it needs to be locked whenever it is modified. I want to lock the object from one thread, and do some work on it. Then I want to keep the object locked while I tell another worker thread to complete the work. So the first thread can go on and do something else while the worker thread finishes up. When the worker thread gets done, it unlocks the mutex. And I want the transition to be seemless so nobody else can get the mutex lock in between when thread 1 starts the work and thread 2 completes it. Something like inter_thread_mutex seems like it would work, and it would also allow the program to interact with it as if it were an ordinary mutex. So it seems like a clean solution. If there's a better solution, I'd be happy to hear that also. EDIT AGAIN: The reason I need locks to begin with is that there are multiple master threads, and the locks are there to prevent them from accessing shared objects concurrently in invalid ways. So the code already uses loop-level lock-free sequencing of operations at the master thread level. Also, in the original implementation, there were no worker threads, and the mutexes were ordinary kosher mutexes. The inter_thread_thingy came up as an optimization, primarily to improve response time. In many cases, it was sufficient to guarantee that the "first part" of operation A, occurs before the "first part" of operation B. As a dumb example, say I punch object 1 and give it a black eye. Then I tell object 1 to change it's internal structure to reflect all the tissue damage. I don't want to wait around for the tissue damage before I move on to punch object 2. However, I do want the tissue damage to occur as part of the same operation; for example, in the interim, I don't want any other thread to reconfigure the object in such a way that would make tissue damage an invalid operation. (yes, this example is imperfect in many ways, and no I'm not working on a game) So we made the change to a model where ownership of an object can be passed to a worker thread to complete an operation, and it actually works quite nicely; each master thread is able to get a lot more operations done because it doesn't need to wait for them all to complete. And, since the event sequencing at the master thread level is still loop-based, it is easy to write high-level master-thread operations, as they can be based on the assumption that an operation is complete when the corresponding function call returns. Finally, I thought it would be nice to use inter_thread mutex/semaphore thingies using RAII with boost locks to encapsulate the necessary synchronization that is required to make the whole thing work.

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  • Practical non-Turing-complete languages?

    - by Kyle Cronin
    Nearly all programming languages used are Turing Complete, and while this affords the language to represent any computable algorithm, it also comes with its own set of problems. Seeing as all the algorithms I write are intended to halt, I would like to be able to represent them in a language that guarantees they will halt. Regular expressions used for matching strings and finite state machines are used when lexing, but I'm wondering if there's a more general, broadly language that's not Turing complete? edit: I should clarify, by 'general purpose' I don't necessarily want to be able to write all halting algorithms in the language (I don't think that such a language would exist) but I suspect that there are common threads in halting proofs that can be generalized to produce a language in which all algorithms are guaranteed to halt. There's also another way to tackle this problem - eliminate the need for theoretically infinite memory. Once you limit the amount of memory the machine is allowed, the number of states the machine is in is finite and countable, and therefore you can determine if the algorithm will halt (by not allowing the machine to move into a state it's been in before).

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  • How do I use NTLM authentication with Active Directory

    - by Jon Works
    I am trying to implement NTLM authentication on one of our internal sites and everything is working. The one piece of the puzzle I do not have is how to take the information from NTLM and authenticate with Active Directory. There is a good description of NTLM and the encryption used for the passwords, which I used to implement this, but I am not sure of how to verify if the user's password is valid. I am using Coldfusion but a solution to this problem can be in any language (Java, Python, PHP, etc). Edit: I am using Coldfusion on Redhat Enterprise Linux. Unfortunately we cannot use IIS to manage this and instead have to write or use a 3rd party tool for this.

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  • Use AJAX to load webpage content into DIV

    - by arik-so
    Hello. I have a text field. When I type something into than text field, I want to load stuff into the DIV below. That's my code equivalent: <input type="text" onkeyup="/* I am not sure, how it's done, but I'll just write: */ document.getElementById('search_results').innerHTML = getContents('search.php?query='+this.value);" /><br/> <div id="search_results"></div> Hope you can help. Thanks in advance! EDIT: I would appreciate it if the solution did not involve using jQuery - as long as it's possible.

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  • Algorithm for finding the smallest power of two that's greater or equal to a given value

    - by Boyan
    I need to find the smallest power of two that's greater or equal to a given value. So far, I have this: int value = 3221; // 3221 is just an example, could be any number int result = 1; while (result < value) result <<= 1; It works fine, but feels kind of naive. Is there a better algorithm for that problem? EDIT. There were some nice Assembler suggestions, so I'm adding those tags to the question.

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