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• Where to start when programming process synchronization algorithms like clone/fork, semaphores

  - by David

  I am writing a program that simulates process synchronization. I am trying to implement the fork and semaphore techniques in C++, but am having trouble starting off. Do I just create a process and send it to fork from the very beginning? Is the program just going to be one infinite loop that goes back and forth between parent/child processes? And how do you create the idea of 'shared memory' in C++, explicit memory address or just some global variable? I just need to get the overall structure/idea of the flow of the program. Any references would be appreciated.

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• Problem generating APN SSL certificate after submitting to apple store

  - by MikeQ

  I'm having trouble getting Apple to generate an APN SSL certificate for my app ID. I've submitted the application to the Apple store, and it is pending review. I tested the application using an Ad Hoc app ID "${bundle_id}.adHoc" and everything went fine. I submitted to the Apple store with app ID "${bundle_id}.release". Now I want to generate my production APN SSL certificate for use with my release application ID - but the developer portal doesn't want to. When I upload my certificate request, it sits for about a minute before telling me: "We are not able to generate your Profile at this time. Please try again later or try using the Provisioning Portal" Is it impossible to generate your certificate while the application is under review or something? Should I have generated it prior to submission?

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• how to manage vim plugin

  - by Haiyuan Zhang

  I want to know how do you manage your vim plugins. As it is, One of the biggest fun of using is that one can easily try many interesing new plugins, just download it and unzip it in under ~/.vim. But if you try too often and try too much, you might get trouble as confilct of key mapping , in compatitble script version, dpendency between different plugin ..... Then you want to remove some plugin ,kind of like rollback your vim to a sound condition. But, the rollback could be very painful . cus for some "giant" plugin, like perl-support ( it's great plugin, anyway), will consist of many vim scripts which spread in different dirctories. To remove single one giant plugin will be anoying, not too mention if you remvoe many plugin at one time. In a word , I'm looking for good practice for managing vim plugins.

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• mysql gem for snow leopard

  - by Will

  I had trouble with the gem at first but got it to work when I installed the 64-bit MySQL and reinsatlled the gem with arch flags. So it work in rails. The error I used to get was uninitialized constant MysqlCompat::MysqlRes but that is now gone :) However in Xcode when I run a RubyCocoa project I still get the old error of uninitialized constant MysqlCompat::MysqlRes Does anyone know why this may be? Is it because the gdb is 64-bit? How can it work in Rails but not in RubyCocoa? A little debugging shows that it fails to load mysql_api.bundle /Library/Ruby/Gems/1.8/gems/mysql-2.8.1/lib/mysql_api.bundle: dlopen(/Library/Ruby/Gems/1.8/gems/mysql-2.8.1/lib/mysql_api.bundle, 9): no suitable image found. Did find: (LoadError) /Library/Ruby/Gems/1.8/gems/mysql-2.8.1/lib/mysql_api.bundle: mach-o, but wrong architecture - /Library/Ruby/Gems/1.8/gems/mysql-2.8.1/lib/mysql_api.bundle from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require'

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• Can't Install ADT. org.eclipse.wst.xml.ui is missing

  - by Michael

  I am having trouble getting the Android Development Tools to install. I overcame one error involving the GEF. I now have a new error. Missing requirement: Android Development Tools 0.9.6.v201002051504-24846 (com.android.ide.eclipse.adt.feature.group 0.9.6.v201002051504-24846) requires 'org.eclipse.wst.xml.ui 0.0.0' but it could not be found I am running Kubuntu 9.10 and Eclipse 3.5. I have managed to get the Android DDMS to install. But I keep running into blocks with the Development Tools. I have the Android SDK installed. What do I need to do in order get the missing component?

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• Strange thing about .NET 4.0 filesystem enumeration functionality

  - by codymanix

  I just read a page of "Whats new .NET Framework 4.0". I have trouble understanding the last paragraph: To remove open handles on enumerated directories or files Create a custom method (or function in Visual Basic) to contain your enumeration code. Apply the MethodImplAttribute attribute with the NoInlining option to the new method. For example: [MethodImplAttribute(MethodImplOptions.NoInlining)] Private void Enumerate() Include the following method calls, to run after your enumeration code: * The GC.Collect() method (no parameters). * The GC.WaitForPendingFinalizers() method. Why the attribute NoInlining? What harm would inlining do here? Why call the garbage collector manually, why not making the enumerator implement IDisposable in the first place? I suspect they use FindFirstFile()/FindNextFile() API calls for the imlementation, so FindClose() has to be called in any case if the enumeration is done.

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• How to call an extended procedure from a function

  - by Alan Featherston Lago

  hi im having trouble trying to get the following function to work. CREATE FUNCTION test ( @nt_group VARCHAR(128) ) RETURNS @nt_usr TABLE ( [name] [nchar](128) NULL , [type] [char](8) NULL , [privilege] [char](9) NULL , [mapped login name] [nchar](128) NULL , [permission path] [nchar](128) NULL ) AS BEGIN INSERT INTO @nt_usr EXEC master.dbo.xp_logininfo 'DOMAIN\USER', @nt_group RETURN END As far as i know i should be allowed to call an extended stored procedure, im getting the following error Mes 443, Level 16, State 14 Could it be that xp_logininfo might return different result sets depending on the parameters? When i use openquery i can overcome this by setting this: SET FMTONLY OFF. Does anyone know if there's a similar workaround for my problem?

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• Theory of computation - Using the pumping lemma for context free languages

  - by Tony

  I'm reviewing my notes for my course on theory of computation and I'm having trouble understanding how to complete a certain proof. Here is the question: A = {0^n 1^m 0^n | n>=1, m>=1} Prove that A is not regular. It's pretty obvious that the pumping lemma has to be used for this. So, we have |vy| = 1 |vxy| <= p (p being the pumping length, = 1) uv^ixy^iz exists in A for all i = 0 Trying to think of the correct string to choose seems a bit iffy for this. I was thinking 0^p 1^q 0^p, but I don't know if I can obscurely make a q, and since there is no bound on u, this could make things unruly.. So, how would one go about this?

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• Win32 call order

  - by DD

  Hi all, I have two windows that I send scripted input to. The procedure goes as this BringWindowToTop( window1 ); i = Build input structures( window1 ); SendInput(i); BringWindowToTop( window2 ); i = Build input structures( window2 ); SendInput(i); I was having trouble with inputs not being sent and the correct time. I put delays after each call and saw that input from the first SendInput() was processed after window2 is brought to top. Same thing at the end of the loop as well. Are SendInput calls buffered? If so, how can I make sure of a serial execution of this code? Thanks

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• touchesBegan and other touch events not getting detected in UINavigationController

  - by SaltyNuts

  In short, I want to detect a touch on the navigation controller titlebar, but having trouble actually catching any touches at all! Everything is done without IB, if that makes a difference. My app delegate's .m file contains: MyViewController *viewController = [[MyViewController alloc] init]; navigationController = [[UINavigationController alloc] initWithRootViewController:viewController]; [window addSubview:navigationController.view]; There are a few other subviews added to this window in a way that overlays navigationController leaving only the navigation bar visible. MyViewController is a subclass of UIViewController and its .m file contains: - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { for (UITouch *touch in touches) { NSLog(@"ended\n"); } } -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { for (UITouch *touch in touches) { NSLog(@"began\n"); } } I also tried putting these functions directly into app delegate's .m file, but the console remains blank. What am I doing wrong?

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• How do you authenticate user generated "apps" for your app?

  - by Brian Armstrong

  I'm think something like Facebook apps here. User generated pieces of code that people can write to interact with my app. I understand how an authenticated API works, but this seems a little more complicated because not only does the APP have to authenticate itself (with a regular api-key) but the USER using the app has to be authenticated somehow too, without giving the app free reign. I've been reading a bit here to see how FB does it: http://wiki.developers.facebook.com/index.php/How_Facebook_Authenticates_Your_Application And it looks like you have to pass a signature in addition to the api-key along with every call, but I'm having trouble wrapping my head around how this gets generated and used on the other end (my server). Figure there must be a simple explanation of this out there? Thanks! P.S. I'm building a Rails app if there are any applicable gems/plugins.

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• Insert Comment Reply Form Into Page Using Jquery

  - by Joe

  I have been making a threaded comment system as a way to learn php and javascript/jquery properly. Ive done bits and bobs in the past but ive made a new years resolution to learn it properly. Im having trouble inserting a reply form into the comment tree below the comment being replied to. I know this is probably pretty basic but how do you insert html into a page when someone clicks a link. This code wasn't working for me: $(document).ready(function(){ $(function() { $('a#reply').click(function() { $(this).append("the html blah"); }); }); }); Anyone see where im going wrong?

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• Python Threading

  - by anteater7171

  I'm trying to make a simple program that continually displays and updates a label that displays the CPU usage, while having other unrelated things going on. I've done enough research to know that threading is likely going to be involved. However, I'm having trouble applying what I've seen in simple examples of threading to what I'm trying to do. What I currently have going: import Tkinter import psutil,time from PIL import Image, ImageTk class simpleapp_tk(Tkinter.Tk): def __init__(self,parent): Tkinter.Tk.__init__(self,parent) self.parent = parent self.initialize() def initialize(self): self.labelVariable = Tkinter.StringVar() self.label = Tkinter.Label(self,textvariable=self.labelVariable) self.label.pack() self.button = Tkinter.Button(self,text='button',command=self.A) self.button.pack() def A (self): G = str(round(psutil.cpu_percent(), 1)) + '%' print G self.labelVariable.set(G) def B (self): print "hello" if __name__ == "__main__": app = simpleapp_tk(None) app.mainloop() In the above code I'm basically trying to get command A continually running, while allowing command B to be done when the users presses the button.

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• code to edit the text in an EditText widgit

  - by user293663

  Hello, I am a newbi programmer and am having trouble with a measurement conversion program I am working on. What I would like to do is have several EditText boxes. When one is filled in and a calculate button is hit then the rest will be populated with a converted number. The part I am getting stuck on is outputting the answers to EditText widgets. ex: There are three EditText Widgets. a user inputs the number 6 into the first one (labeled inches) and presses calculate. I would like the next box to display .5 (labeled feet) and the last to display .1666 (this would be yards) .setText() apparently does not work to modify the text in an EditText any help would be greatly appreciated.

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• Re-factoring a CURL request to Ruby's RestClient

  - by user94154

  I'm having trouble translating this CURL request into Ruby using RestClient: system("curl --digest -u #{@user}:#{@pass} '#{@endpoint}/#{id}' --form image_file=@'#{path}' -X PUT") I keep getting 400 Bad Request errors. As far as I can tell, the request does get properly authenticated, but hangs up from the file upload part. Here are my best attempts, all of which get me those 400 errors: resource = RestClient::Resource.new "#{@endpoint}/#{id}", @user, @pass #attempt 1 resource.put :image_file => File.new(path, 'rb'), :content_type => 'image/jpg' #attempt 2 resource.put File.read(path), :content_type => 'image/jpg' #attempt 3 resource.put File.open(path) {|f| f.read}, :content_type => 'image/jpg'

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• Regular Expression Help in .NET

  - by Matt H.

  I have a simple pattern I am trying to match, any characters captured between parenthesis at the end of an HTML paragraph. I am running into trouble any time there is additional parentheticals in that paragraph: i.e. If the input string is "..... (321)</p" i want to get the value (321) However, if the paragraph has this text: "... (123) (321)</p" my regex is returning "(123) (321)" (everything between the opening "(" and closing ")" I am using the regex pattern "\s(.+)</p" How can I grab the correct value (using VB.NET) This is what I'm doing so far: Dim reg As New Regex("\s\(.+\)</P>", RegexOptions.IgnoreCase) Dim matchC As MatchCollection = reg.Matches(su.Question) If matchC.Count > 0 Then Dim lastMatch As Match = matchC(matchC.Count - 1) Dim DesiredValue As String = lastMatch.Value End If

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• Equality Comparison with Multiple Instances/IEqualityComparer problems in LINQ

  - by Stacey

  This is similar to my last question; but from a different angle. http://stackoverflow.com/questions/2792393/see-if-item-exists-once-in-enumerable-linq Given the following set of items, and lists containing them... Item 1 Item 2 Item 3 Item 4 Item 5 class Item { string Name { get; set; } } List<Item> available = new List<Item>() { Item 1 Item 1 Item 2 Item 3 Item 5 } List<Item> selected = new List<Item>() { Item 1 Item 2 Item 3 } I need to make a third List that has everything from "available", except what is in "selected". However 'Item 1' is in 'available' twice, but only in 'selected' once. Since they are instances of the same item, I am having trouble figuring out the appropriate logic to accomodate this. The final array should look like... List<Item> selectable = new List<Item>() { Item 1 Item5 }

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• Can CultureInfo.CurrentCulture differ per application pool?

  - by Peter

  I'm having trouble with CultureInfo in our ASP.NET web application. Our web application returns a different culture, depending on which application pool it is in. In application pool A, it is en-US, but in application pool B, it's nl-BE. I'd like it to be nl-BE, but can't find where to change this (IIS6 by the way). I'm not even sure if this can be changed on an app-pool level. I'm checking with CultureInfo.CurrentCulture.Name. Is it possible to change this for an application pool? Or what else could influence this? In the regional settings of the server, we have selected 'Dutch (Belgium)', which translates to nl-BE, I believe. So where could this application pool be getting the en-US?

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• Static Access To Multiple Instance Variable

  - by Qua

  I have a singleton instance that is referenced throughout the project which works like a charm. It saves me the trouble from having to pass around an instance of the object to every little class in the project. However, now I need to manage multiple instances of the previous setup, which means that the singleton pattern breaks since each instance would need it's own singleton instance. What options are there to still maintain static access to the singleton? To be more specific, we have our game engine and several components and plugins reference the engine through a static property. Now our server needs to host multiple game instances each having their own engine, which means that on the server side the singleton pattern breaks. I'm trying to avoid all the classes having the engine in the constructor.

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• Are Symphony and CakePHP too slow to be usable?

  - by Aziz Light

  Until now, I have always said that CakePHP is too bloated and slow. I don't really know that, I just saw "some" benchmarks. What I really want to know, is that if those two frameworks (Symfony and CakePHP) are too slow to be usable in a way that the user will get frustrated. I already know that those frameworks are slower than other alternatives, but that's not the question. I ask the question because I want to create a project management web application and I still hesitate between a couple frameworks. I've had some trouble learning Zend, but imho I haven't tried hard enough. So in conclusion, in addition to the first question above, I would like to ask another question: If I want to create a project management tool (which is a pretty big project), which of the following should you suggest, considering the developement time, the speed of the resulting application, and the robustness of the final product: Symphony CakePHP Zend Framework Also I should mention that I don't know any of those frameworks, and that I want to learn one of them (at least).

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• My Header over External Content

  - by TrivaniJoanne

  I can see this web site is somewhat over my head, but I'm having trouble finding an answer. I want to put my header, with links to other pages, over external content. Here's why: My MLM gives me a replicated web site that they maintain. I want to add links to my blog, contact info, even meta tags to the site. I though I had it done by using an iframe. I have my content at the top, and the MLM site shows up in the iframe. (here is the link www.trivanijoanne.com) The problem is that the iframe doesn't resize when the external content changes, and it is confusing for the user to need to scroll up to see the page. Also, the pdf pages don't load inside the iframe. I looked around online and see that iframes are a thing of the past. What should I be using to accomplish this task?

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• What resources will help me understand the fundamentals of Relational Database Systems.

  - by Rachel

  This are few of the fundamental database questions which has always given me trouble. I have tried using google and wiki but I somehow I miss out on understanding the functionality rather than terminology. If possible would really appreciate if someone can share more insights on this questions using some visual representative examples. What is a key? A candidate key? A primary key? An alternate key? A foreign key? What is an index and how does it help your database? What are the data types available and when to use which ones?

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• iPhone: Infinitely looping content inside UIScrollView

  - by Cuzog

  In my app, I'm designing a custom picker that allows the user to choose an item by scrolling horizontally and touching it. I need the buttons inside that view to loop around infinitely as the user scrolls in a certain direction. What would be the best way to tackle this feature while maintaining the inertial scrolling of UIScrollView when the content loops around out of the view? From my research of others trying to attempt this, they have trouble maintaining the deceleration animation if the scroll position is programatically shifted mid-scroll after the user lifts their finger. How can I work around this limitation? An example of an app that currently has this feature is Apple's MobileMe Gallery app. In the interface, after choosing a gallery, at the top, there is a horizontally scrollable photo picker that loops infinitely as it is dragged one direction. Any advice is greatly appreciated.

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• Delayed_Job - on site5 server

  - by Matenia Rossides

  I am currently using a site5 server and would like rake jobs:work pretty much running all the time. I currently cannot send out the jobs unless i'm logged into the server. I hope that someone out there can help me with this. Had alot of trouble with ar_mailer and the whenever gem ... but have about another 5 gems working perfectly within my rails app. can someone shed some light on a solution for this please? greatly appreciated. (installed delayed_job as a plugin)

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• Problems with jquery selector

  - by Gandalf StormCrow

  I have a trouble with selecting element attributes with jquery here is my HTML: <a class="myselector" rel="I need this value"></a> <div class="someClass" id="someID"> ...bunch of elements/content <input type="button" name="myInput" id="inputID" title="myInput Title" /> ...bunch of elements/content </div> ...bunch of elements/content Here I'm trying to get the rel value of myselector here is how I tried but its not working : $('#inputID').live('click',function(){ console.log($(this).closest('a.myselector').attr('rel')); }); Also tried this since all is wrapped in wrapper div : $('#inputID').live('click',function(){ console.log($(this).parent('div.wrapper').find('a.myselector').attr('rel')); }); I get undefined value in firebug in both cases, I use live because div#someID is loaded in the document its not there when page first loads. Any advice, how can I get my selector rel value?

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