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• multithreading in c#

  - by Lalit Dhake

  Hi, I have console application. In that i have some process that fetch the data from database through different layers ( business and Data access). stores the fetched data in respective objects. Like if data is fetched for student then this data will store (assigned ) to Student object. same for school. and them a delegate call the certain method that generates outputs as per requirement. This process will execute many times say 10 times. Ok? I want to run simultaneously this process. not one will start, it will finish and then second will start. I want after starting 1'st process, just 2'nd , 3rd....10'th must be start. Means it should be multithreading. how can i achieve this ? is that will give me error while connection with data base open and close ? I have tried this concept . but when thread 1'st is starting then data will fetched for thread 1 will stored in its respective (student , school) objects. ok? when simultaneous 2'nd thread starts , but the data is changing of 1'st object ,while control flowing in program. What have to do?

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• Using IsolatedStorage on a IIS server

  - by JoeBilly

  I'am a bit confusing about the use of Isolated Storage on an IIS server. I understand the goal of Isolated Storage : provides a safe place to store data with no worry about how and where is this place. Since Isolated Storage has a by-user and by-assembly approach, I'am not to wild about using it on a IIS server where applications have almost their own identity. I haven't really seen the interest of impersonating a web application and almost never seen impersonated web applications myself but this is my point of view. Using Isolated Storage on a server mean : Using Isolated stores in \Documents and Settings\<user>\ Which mean \Documents and Settings\Default User\ when the application pool is owned by Local System or Network Services I guess Which also mean Write rights on this folder for Local System or Network Services Using of impersonation Regarding a web application (logic), these ideas are confusing me... Document and Settings ? Default User ? Enable impersonation just for storage ? No control about storage on server ? Uh ? And then I'am a front of a dilema : use System.IO.Packaging (with Isolated Storage inside) on web applications or find an alternative ? Am I wrong in my approach ? Did I miss something ? Any point of view is appreciated and an explanation about the Isolated Storage with IIS philosophy could be an anwser. Thanks !

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• Custom Error Handling

  - by Michael

  Using GoDaddy to host my site (I know that's my first problem)! :-) Trying to setup customer error messages for my site using IIS7. GoDaddy allows you to setup a 404 in their control panel, but I can't override this, or setup any additional error redirects, specifically a 500-server error. Here is my web.config file: <configuration> <system.webServer> <rewrite> <rules> <rule name="Redirect to WWW" stopProcessing="true"> <match url=".*" /> <conditions> <add input="{HTTP_HOST}" pattern="^mysite.com$" /> </conditions> <action type="Redirect" url="http://www.mysite.com/{R:0}" redirectType="Permanent" /> </rule> </rules> </rewrite> </system.webServer> <system.web> <customErrors mode="On" defaultRedirect="http://www.mysite.com/oops.php"> <error statusCode="404" redirect="http://www.mysite.com/oops.php?error=404" /> <error statusCode="500" redirect="http://www.mysite.com/oops.php?error=500" /> </customErrors> </system.web> </configuration>

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• Custom Error Handling

  - by Michael

  Using GoDaddy to host my site (I know that's my first problem)! :-) Trying to setup custom error messages for my site using IIS7. GoDaddy allows you to setup a 404 in their control panel, but I can't override this, or setup any additional error redirects, specifically a 500-server error. Here is my web.config file: <configuration> <system.webServer> <rewrite> <rules> <rule name="Redirect to WWW" stopProcessing="true"> <match url=".*" /> <conditions> <add input="{HTTP_HOST}" pattern="^mysite.com$" /> </conditions> <action type="Redirect" url="http://www.mysite.com/{R:0}" redirectType="Permanent" /> </rule> </rules> </rewrite> </system.webServer> <system.web> <customErrors mode="On" defaultRedirect="http://www.mysite.com/oops.php"> <error statusCode="404" redirect="http://www.mysite.com/oops.php?error=404" /> <error statusCode="500" redirect="http://www.mysite.com/oops.php?error=500" /> </customErrors> </system.web> </configuration>

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• How to test an HTTP 301 redirect?

  - by NoozNooz42

  How can one easily test HTTP return codes, like, say, a 301 redirect? For example, if I want to "see what's going on", I can use telnet to do something like this: ... $ telnet nytimes.com 80 Trying 199.239.136.200... Connected to nytimes.com. Escape character is '^]'. GET / HTTP/1.0 (enter) (enter) HTTP/1.1 200 OK Server: Sun-ONE-Web-Server/6.1 Date: Mon, 14 Jun 2010 12:18:04 GMT Content-type: text/html Set-cookie: RMID=007af83f42dd4c161dfcce7d; expires=Tuesday, 14-Jun-2011 12:18:04 GMT; path=/; domain=.nytimes.com Set-cookie: adxcs=-; path=/; domain=.nytimes.com Set-cookie: adxcs=-; path=/; domain=.nytimes.com Set-cookie: adxcs=-; path=/; domain=.nytimes.com Expires: Thu, 01 Dec 1994 16:00:00 GMT Cache-control: no-cache Pragma: no-cache Connection: close <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> ... Which is an easy way to access quite some infos. But now I want to test that a 301 redirect is indeed a 301 redirect. How can I do so? Basically, instead of getting a HTTP/1.1 200 OK I'd like to know how I can get the 301? I know that I can enter the name of the URL in a browser and "see" that I'm redirected, but I'd like to know what tool(s) can be used to actually really "see" the 301 redirect. Btw, I did test with a telnet, but when I enter www.example.org, which I redirected to example.org (without the www), all I can see is an "200 OK", I don't get to see the 301.

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• Sys is undefined

  - by James

  I have an ASP.Net/AJAX control kit project that i am working on. 80% of the time there is no problem. The page runs as it should. If you refresh the page it will sometimes show a javascript error "Sys is undefined". It doesn't happen all the time, but it is reproducible. When it happens, the user has to shut down their browser and reopen the page. This leads me to believe that it could be an IIS setting. Another note. I looked at the page source both when I get the error, and when not. When the page throws errors the following code is missing: <script src="/ScriptResource.axd?d=EAvfjPfYejDh0Z2Zq5zTR_TXqL0DgVcj_h1wz8cst6uXazNiprV1LnAGq3uL8N2vRbpXu46VsAMFGSgpfovx9_cO8tpy2so6Qm_0HXVGg_Y1&amp;t=baeb8cc" type="text/javascript"></script> <script type="text/javascript"> //<![CDATA[ if (typeof(Sys) === 'undefined') throw new Error('ASP.NET Ajax client-side framework failed to load.'); //]]> </script>

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• Did you love the game Mouse Trap as a kid, or something similar? (Programmer Psychology) [closed]

  - by Robert Oschler

  When I was a kid I absolutely fell in love with games that had as a core feature, the need to understand interconnecting structures. My favorite of all time was Mouse Trap. For the younger crowd out there, this was a very cool board game where you built the mouse trap out of the included plastic pieces as you played, with the end goal to trigger the mouse trap. The fully assembled mouse trap was a Rube Goldberg style invention where one operation triggered the next and the next and so on, until the last step dropped a cage on a little plastic mouse. Sometimes when I'm programming and I'm reviewing a particularly complex interaction between components and objects, while tracking the flow path mentally, I say to myself "It's a Mouse Trap!" and I wonder if my early addiction to that game and others like it was portent to my becoming a programmer. Another realization I have sometimes when looking at my code is how daunted I feel at the share complexity involved, followed by a darker comedic amazement at my expectation that it will all come together and work. How about you? Did you find yourself drawn to games that at their heart featured interacting control paths when growing up? Robert.

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• a floating toolbar in WTL

  - by freefallr

  I've created a multimedia app that uses DirectShow to display multiple media streams simultaneously. The app is a WTL MDI application. For video windows, I use a CWindowImpl derived class - one per CChildFrame. I'd like to add controls to the video windows (volume ctrls etc). I'd initially thought about adding a slider (volume) control and a couple of buttons to a context menu - but later thought that this might not be the best approach. I was looking at MS Word 2007 - which has a floating toolbar that allows you to change options on highlighted text. I'd like to implement a similar floating toolbar for the video controls. I googled around a bit and found an old post about floating toolbars in WTL. The response was - for a floating toolbar, create a popup window and make it's parent the main window. I think that this sounds like a reasonable approach. my questions: Is this a good approach, or is there a more standard approach for a floating toolbar now in WTL? Should I make the toolbar a child of the video window or the CChildFrame that contains the video window, in order to ensure that it always remains on top of the video? How can I implement transparency in the floating toolbar, as in the floating toolbar in MS word?

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• Browser Based Streaming Video/Audio (not progressive download)

  - by Josh

  Hello, I am trying to understand conceptually the best way to deliver real streaming audio and video content. I would want it to be consumed with a web browser, utilizing the least amount of proprietary technology. I wouldn't be serving static files and using progressive download, this would be real audio streams being captured live. How does one broadcast a stream that will be reasonably in sync with the source? What kind of protocol is suitable? Edit: In research I've found that there are a few protocols: RTSP, HTTP Streaming, RTMP, and RTP. HTTP streaming is somewhat unsuitable if you are streaming a live performance/communication of some kind because it relies on TCP (as its HTTP based) and you don't lose packets. In a low bandwidth situation, the client can get significantly behind in playback. ref RTMP is a proprietary technology, requiring flash media server. Crap on that. The reason I looked at flash is because they are extremely flexible as far as user experience goes. SoundManager2 provides an excellent javascript interface for playing media with flash. This is what I would look for in a client application. RTSP/RTP is what Microsoft switched to using, deprecating their MMS protocol. RTSP is the control protocol. Its similar to HTTP with a few distinct difference -- server can also talk to the client, and there are additional commands, like PAUSE. Its also a stateful protocol, which is maintained with a session id. RTP is the protocol for delivering the payload (encoded audio or video). There are a few open sourced projects, one of them being supported by apple here. It seems like this might do what I want it to, and it looks like quite a few players support it. It sounds like it would be suitable for a "live" broadcast from this page here. Thanks, Josh

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• Record/Playback with AudioQueue on iPhone

  - by Biranchi

  Hi, I am currently using Audio Queues on the iPhone to record and playback audio. What I would like to be able to do is to record some audio, allow the user to pause the record queue, and to seek back and forward through the audio to select a position from where they can start recording from again. I have got over the seeking issue by making the playback AudioQueueBuffer sizes small enough so that the play audio queue callback happens at a rate that allows the user to use a slider control to hear the audio as they adjust the slider back and forth. I think I can achieve the recording at a new position by setting the inStartingPacket parameter of the AudioFileWritePackets function that I call from the Audio Recording Queue callback. The trouble is this only inserts audio over the previously recorded audio. The file length obviously doesn't change so if the user were to go backwards and record less audio than before, the old audio still remains after the end of the newly recorded audio. Is there a way I can get the AudioFile to truncate at the point the user starts to insert the new audio, is there some other way I can remove the old audio starting at the insert position or is there a better way about going about this task? Thanks

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• WinForms Load Event / Static Initialization Strangeness

  - by Eric J.

  Background I'm troubleshooting an WinForms 2.0 program that's already been burned to CD for distribution to an internet-challenged target audience. Some users are experiencing a fatal error that I can reproduce locally. Reproducing the Error I get the fatal error when I log into my Vista box using a standard user that I just created, even if I run the program as administrator. I do not get the fatal error when I log in as local administrator. I'm not sure that being administrator is necessarily the trigger (since runas did not help). I have reproduced this half a dozen times under each account with consistent results. The faulty code Base.cs (base class for several user controls, only one of which is shown on first screen) private void BaseWindow_Load(object sender, EventArgs e) { // This message shown once in both cases MessageBox.Show("BaseWindow_Load for " + this.GetType().FullName); SkinManager.ApplySkin(this); } SkinManager.cs private static Skin skin = null; public static void ApplySkin(UserControl applyTo) { if (skin == null) { skin = new Skin(SkinsDirectory, "Default"); } } Skin.cs internal Skin(string skinPath, string skinName) { config = SkinConfig.Load(path); } SkinConfig.cs public static SkinConfig Load(string path) { // This message shown only once running as Admin but twice running as standard user System.Windows.Forms.MessageBox.Show("@1"); // !!! LOCK path HERE !!! } A user control loads on the first form, which triggers a call to SkinManager.ApplySkin, which checks if skin is null and, if so assigns it (without thread synchronization or recursion protection), which ultimately causes a file to be opened. When logged in as local admin, that sequence completes just fine. When logged in as my test standard user, ApplySkin is always called a second time while skin is still null, causing a second attempt to load, causing the file to be locked on the second attempt. The error handling is draconian at this point and the program terminates. The Question While this code can be easily fixed, I would like to understand why the error is happening only in some cases.

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• Timeout reading verity collection - CF8

  - by Gary

  For a long time now I've been having a problem with using the verity search service bundled with ColdFusion 8. The issue is with timeout errors occurring when perfoming any operation on a collection. It's intermittent, and usually occurs after a few operations have been successfully performed. For instance: If I'm adding records to a collection the first, say 15 records, will go through with no problems, but all subsequent records will timeout until the service is rebooted. I'm on a shared server, Windows 2008, 64bit as far as I know. The error I receive is: "An error occurred while performing an operation in the Search Engine library. Error reading collection information.: com.verity.api.administration.ConfigurationException: java.io.IOException: Read timed out" Having spoken to my hosting company, and after doing some research, it's been suggested that the number of collections on a server may cause this issue. I've reduced the amount of collections I use, and there are currently 39 collections on the server. As I'm on a shared server, I have no control over how many collections other customers use, however I've read that the limit is 128 collections, so I don't see why 39 should cause it to become unusable. The collections aren't big, there's maybe around 5,000 records between all of them. Any ideas?

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• Applications on the Web/Cloud the way to go? over Desktop apps?

  - by jiewmeng

  i am currently a mainly web developer, but is quite attracted to the performance and great integration with the OS (eg. Windows 7, Jump Lists, Taskbar Thumbnails, etc) something like WPF/C# can provide to the user, improving workflow and productivity. privacy and performance seems like a major downside of web/cloud apps compared to desktop apps. applications on the cloud/web work on the go, increased popularity of smartphones/netbooks majority of users may not benefit as much from increased performance of desktop apps, eg. internet surfing, word processing, probably benefit more from decreased startup times, lower costs and data on the cloud desktop applications increased performance benefits power users like 3D rendering, HD video/photo editing, gamers (i wonder if such processing maybe offset to cloud processing) integration with OS increases productivity (maybe such features can be adapted to a web version? maybe with a local desktop app to work with Web App API) more control over privacy (maybe fixed by encryption?) local data access (esp. large files) guaranteed and fast (YouTube HD fast enough most of the time) work not affected by intermittent/slow/availability internet connections (i know this is changing tho) what do you think?

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• Tabs in asp.net mvc

  - by Xulfee

  I have three tabs on page and one user control. I want to RenderPartial on each tab. <script type="text/javascript"> $(document).ready(function() { $("#tabs").tabs(); }); </script> <div id="tabs"> <ul> <li><a href="#tabs-1">Text 1</a></li> <li><a href="#tabs-2">Text 2</a></li> <li><a href="#tabs-3">Text 3</a></li> </ul> <div id="tabs-1"> <% Html.RenderPartial("usercontrol", Model); %> </div> <div id="tabs-2"> <% Html.RenderPartial("usercontrol", Model); %> </div> <div id="tabs-3"> <% Html.RenderPartial("usercontrol", Model); %> </div> </div> how can i get values from different tabs.

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• batch file to merge .js files from subfolders into one combined file

  - by Andrew Johns

  I'm struggling to get this to work. Plenty of examples on the web, but they all do something just slightly different to what I'm aiming to do, and every time I think I can solve it, I get hit by an error that means nothing to me. After giving up on the JSLint.VS plugin, I'm attempting to create a batch file that I can call from a Visual Studio build event, or perhaps from cruise control, which will generate JSLint warnings for a project. The final goal is to get a combined js file that I can pass to jslint, using: cscript jslint.js < tmp.js which would validate that my scripts are ready to be combined into one file for use in a js minifier, or output a bunch of errors using standard output. but the js files that would make up tmp.js are likely to be in multiple subfolders in the project, e.g: D:\_projects\trunk\web\projectname\js\somefile.debug.js D:\_projects\trunk\web\projectname\js\jquery\plugins\jquery.plugin.js The ideal solution would be to be able to call a batch file along the lines of: jslint.bat %ProjectPath% and this would then combine all the js files within the project into one temp js file. This way I would have flexibility in which project was being passed to the batch file. I've been trying to make this work with copy, xcopy, type, and echo, and using a for do loop, with dir /s etc, to make it do what I want, but whatever I try I get an error.

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• Selecting a Java framework for large application w/ only ONE user

  - by Bijan

  I am building a large application that will be hosted on an AWS server. I'm trying to select a web framework for assisting me with code organization, template design, and generally presentation aspects. Here are some points of consideration: Require security/login/user authentication. I may add the ability in the future to allow more than just an administrator to access the web app, but it is not a public facing website. AJAX support would be helpful. There are a couple widgets that I don't want to recreate. One is a tree object, where the user can expand/contract items in the list, can create new branches, add/edit objects. This would be better off in some dynamic view rather than all done in ugly html. Generally, this is just to provide the application with a face for control, management, and monitoring. Having an easier time adding buttons, CSS, AJAX widgets are great additions though, but not the primary purpose. I'm considering: Wicket Spring Seam GWT Stripe and the list goes on, as I'm sure you all know. I originally planned on using GWT, but then started to feel that GWT didn't cover my primary needs. I could be wrong about this, but there seems to be a lot of support for GWT AND Wicket/Spring. All of this 'getting lost in java frameworks' got me thinking outside the java realm for a framework that would suit my needs that was a clear option, like: JRuby/Rails Jython/Django Groovy/Grails Guice (just throwing this in there... I don't clearly understand the main purposes of all these frameworks. It doesn't seem like DInjection is something I need for a single purpose application) Thanks as always. This community makes Googling for esoteric programming information an order of magnitude better.

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• Binding WPF ComboBox in XAML - Why is it Empty?

  - by mdiehl13

  I am trying to learn how to bind my simple database (.sdf) to a combobox. I created a dataset with my tables in it. I then dragged a table from the DataSource onto my control. There are no build warnings/errors, and when it runs, the ComboBox is empty. <UserControl x:Class="OurFamilyFinances.TabItems.TransactionTab" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" mc:Ignorable="d" d:DesignHeight="414" d:DesignWidth="578" xmlns:my="clr-namespace:OurFamilyFinances" Loaded="UserControl_Loaded_1"> <UserControl.Resources> <my:FinancesDataDataSet x:Key="financesDataDataSet" /> <CollectionViewSource x:Key="accountViewSource" Source="{Binding Path=Account, Source={StaticResource financesDataDataSet}}" /> </UserControl.Resources> <Grid> <ComboBox DisplayMemberPath="Name" Height="23" HorizontalAlignment="Left" ItemsSource="{Binding Source={StaticResource accountViewSource}}" Margin="3,141,0,0" Name="accountComboBox" SelectedValuePath="ID" VerticalAlignment="Top" Width="120"> <ComboBox.ItemsPanel> <ItemsPanelTemplate> <VirtualizingStackPanel /> </ItemsPanelTemplate> </ComboBox.ItemsPanel> </ComboBox> </Grid> The paths that is shows are correct, the selectedPath is "ID" and the displaypath is "Name". If I do this in Linq to Sql, the combo box does populate: this.accountComboBox.ItemsSource = from o in db.Account select new { o.ID, o.Name }; But I would like to learn how to do this in XAML. I have dragged datagrids from the DataSource as well, but they are not populated either. Any idea?

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• custom view on iphone's native media player(MPMoviePlayerController)

  - by sneha

  I am building an application that implements a custom view on iPhone’s native media player. I want your help in deciding directions to lay this effort. At present I have find out that iPhone SDK doesn’t support APIs to customize media player. I need these things in the player: I would like to have custom views i.e. want to change all control buttons on player like Play/Pause, seek bar etc. The background of player will also need to be different. The player has to play audio or video file from local/remote location. Can i use MPMoviePlayerController if it can be customized (How to do it ??). However, any other third party player approved by iPhone which has an ability to download and play the media file from local/remote location is also fine. It will be great to have an access to media player buffer so that it can be encrypted. I have following questions: 1.Any help in building/customizing player..... 2.Do you see issues in signing of application? 3.Does Apple have any restrictions on customizing media player? 4.Any sample iPhone application where media player is customized Any help in this regard is highly appreciated.

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• C# UserControl Validation

  - by Barry

  Hi, I have a UserControl with a Tab Control containing three tabs. Within the tabs are multiple controls - Datetimepickers, textboxes, comboboxes. There is also a Save button which when clicked, calls this.ValidateChildren(ValidationConstraints.Enabled) Now, I click save and a geniune validation error occurs. I correct the error and then click save again - valdiation errors occur on comboboxes on a different tab. If I navigate to this tab and click save, everything works fine. How can this be? I haven't changed any values in the comboboxes so how can the fail validation then pass validation? The comboboxes are bound to a dataset with their selectedValue and Text set. I just don't understand what is happening here. This behaviour also occurs for some textboxes too. The validation rule is that they have to be a decimal - the default value is zero, which is allowed. The same thing happens, they fail validation the first time - I make no changes, click save again and they pass validation. If you need any further information please let me know thanks Barry

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• YUI DataTable - Howto have just one paginator?

  - by Rollo Tomazzi

  Hello, I'm using the YUI DataTable in a Grails 1.1 project using the Grails UI plugin 1.0.2 (YUI being 2.6.1). By default, the DataTable displays 2 paginators: one above and another one below the table. Looking up the YUI API documentation, I could see that I can pass an array of YUI containers as a config parameter but - what are the names of these containers? I've tried loooking at the HTML of the page using Firebug. The ID of the divs containing the paginators are: yui-dt0-paginator0 (above) and yui-dt0-paginator1 (below). If I use them to configure the containers for the navigator, then the navigator is just not displayed at all. Here's the relevant extract of the GSP page containing the Datatable element. <div class="body"> <h1>This is the List of Control Accounts</h1> <g:if test="${flash.message}"> <div class="message">${flash.message}</div> </g:if> <div class="yui-skin-sam"> <gui:dataTable controller="controlAccount" action="enhancedListDataTableJSON" columnDefs="[ [key:'id', label:'ID'], [key:'col1', label:'Col 1', sortable: true, resizeable: true], [key:'col2', label:'Col 2', sortable: true, resizeable: true] ]" sortedBy="col1" rowsPerPage="20" paginatorConfig="[ template:'{PreviousPageLink} {PageLinks} {NextPageLink} {CurrentPageReport}', pageReportTemplate:'{totalRecords} total accounts', alwaysVisible:true, containers:'yui-dt0-paginator1' ]" rowExpansion="true" /> </div> </div> Any help? Thanks! Rollo

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• LINQ compiled query DataBind issue

  - by Brian

  Hello All, I have a pretty extensive reporting page that uses LINQ. There is one main function that returns an IQueryable object. I then further filter / aggregate the returned query depending on the report the user needs. I changed this function to a compiled query, it worked great, and the speed increase was astonishing. The only problem comes when i want to databind the results. I am databinding to a standard asp.net GridView and it works fine, no problems. I am also databinding to an asp.net chart control, this is where my page is throwing an error. this works well: GridView gv = new GridView(); gv.DataSource = gridSource; But this does not: Series s1 = new Series("Series One"); s1.Points.DataBindXY(gridSource, "Month", gridSource, "Success"); The error i receive is this: System.NotSupportedException Specified method is not supported When i look into my gridSource var at run time i see this using a typical linq query: SELECT [t33].[value2] AS [Year], [t33].[value22] AS [Month], [t33].[value3] AS [Calls]...... I see this after i change the query to compiled: {System.Linq.OrderedEnumerable<<>f__AnonymousType15<string,int,int,int,int,int,int,int>,string>} This is obviously the reason why the databindxy is no longer working, but i am not sure how to get around it. Any help would be appreciated! Thanks

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• How can I improve my real-time behavior in multi-threaded app using pthreads and condition variables

  - by WilliamKF

  I have a multi-threaded application that is using pthreads. I have a mutex() lock and condition variables(). There are two threads, one thread is producing data for the second thread, a worker, which is trying to process the produced data in a real time fashion such that one chuck is processed as close to the elapsing of a fixed time period as possible. This works pretty well, however, occasionally when the producer thread releases the condition upon which the worker is waiting, a delay of up to almost a whole second is seen before the worker thread gets control and executes again. I know this because right before the producer releases the condition upon which the worker is waiting, it does a chuck of processing for the worker if it is time to process another chuck, then immediately upon receiving the condition in the worker thread, it also does a chuck of processing if it is time to process another chuck. In this later case, I am seeing that I am late processing the chuck many times. I'd like to eliminate this lost efficiency and do what I can to keep the chucks ticking away as close to possible to the desired frequency. Is there anything I can do to reduce the delay between the release condition from the producer and the detection that that condition is released such that the worker resumes processing? For example, would it help for the producer to call something to force itself to be context switched out? Bottom line is the worker has to wait each time it asks the producer to create work for itself so that the producer can muck with the worker's data structures before telling the worker it is ready to run in parallel again. This period of exclusive access by the producer is meant to be short, but during this period, I am also checking for real-time work to be done by the producer on behalf of the worker while the producer has exclusive access. Somehow my hand off back to running in parallel again results in significant delay occasionally that I would like to avoid. Please suggest how this might be best accomplished.

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• Browser back button restores empty fields

  - by Pierre

  I have a web page x.php (in a password protected area of my web site) which has a form and a button which uses the POST method to send the form data and opens x.php#abc. This works pretty well. However, if the users decides to navigate back in Internet Explorer 7, all the fields in the original x.php get cleared and everything must be typed in again. I cannot save the posted information in a session and I am trying to understand how I can get IE7 to behave the way I want. I've searched the web and found answers which suggest that the HTTP header should contain explicit caching information. Currently, I've tried this : session_name("FOO"); session_start(); header("Pragma: public"); header("Expires: Fri, 7 Nov 2008 23:00:00 GMT"); header("Cache-Control: public, max-age=3600, must-revalidate"); header("Last-Modified: Thu, 30 Oct 2008 17:00:00 GMT"); and variations thereof. Without success. Looking at the returned headers with a tool such as WireShark shows me that Apache is indeed honouring my headers. So my question is: what am I doing wrong?

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• Wysiwyg with image copy/paste

  - by jW

  First, I understand that an image cannot be "copied" from a local machine into a website. I understand that it must be uploaded. I am a web programmer, and am familiar with common web wysiwyg tools such as TinyMCE and FCKEditor. My question is if there exists a program or web module or something of the sort that works will perform an automatic upload of images for a wysiwyg. I have a client that is constantly complaining about not being able to copy/paste documents with images from MS Word into a wysiwyg to create content on their website. I have looked into TX Text Control (http://labs.textcontrol.com/) and was looking into a possibly flash wysiwyg that could upload the file automatically behind the scenes. I don't know if this exists, and google did not much help me in my search, so I thought I would ask other coders. I am open to any sort of server technology, or browser requirements. I am looking for some browser based tool instead of an application tool such as Dreamweaver or otherwise. If no good solution to the problem exists, I am willing to accept that at this point. Note: This was a request from a client, and to me it seemed rather unreasonable. I decided to gather community advice instead of just tell the client 'No' and the options here have been extremely helpful and informative in presenting possible solutions.

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• RFC regarding WAM

  - by Noctis Skytower

  Request For Comment regarding Whitespace's Assembly Mnemonics What follows in a first generation attempt at creating mnemonics for a whitespace assembly language. STACK ===== push number copy copy number swap away away number MATH ==== add sub mul div mod HEAP ==== set get FLOW ==== part label call label goto label zero label less label back exit I/O === ochr oint ichr iint In the interest of making improvements to this small and simple instruction set, this is a second attempt. hold N Push the number onto the stack copy Duplicate the top item on the stack copy N Copy the nth item on the stack (given by the argument) onto the top of the stack swap Swap the top two items on the stack drop Discard the top item on the stack drop N Slide n items off the stack, keeping the top item add Addition sub Subtraction mul Multiplication div Integer Division mod Modulo save Store load Retrieve L: Mark a location in the program call L Call a subroutine goto L Jump unconditionally to a label if=0 L Jump to a label if the top of the stack is zero if<0 L Jump to a label if the top of the stack is negative return End a subroutine and transfer control back to the caller exit End the program print chr Output the character at the top of the stack print int Output the number at the top of the stack input chr Read a character and place it in the location given by the top of the stack input int Read a number and place it in the location given by the top of the stack What do you think of the following revised list for Whitespace's assembly instructions? I'm still thinking outside of the box somewhat and trying to come up with a better mnemonic set than last time. When the previous interpreter was written, it was completed over two contiguous, rushed evenings. This rewrite deserves significantly more time now that it is the summer. Of course, the next version of Whitespace (0.4) may have its instructions revised even more, but this is just a redesign of what originally was done in a very short amount of time. Hopefully, the instructions make more sense once someone new to programmings thinks about them.

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