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  • understanding computers [closed]

    - by Ashwin
    Possible Duplicate: Good resources to understand how a program interacts with machine hardware I don't know if this is the correct StackExchange site to ask this question. But I could not find any other. I want to understand how a computer works from the software level to the internal structure. For example what happens when I press a button on keyboard. The OS interprets it and then what changes happen in the flip-flops. How is an operating system written? If it is written using some programming language, then how is that interpreter written. At some point it has to come down to the hardware, right? I know to program in c, c++ and java. But after all these years I am still not sure about what is happening inside. I would be grateful to anyone who points me to to a link or a video that explains this to the deep.

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  • Wine throwing errors since going to 13.10

    - by serilain
    After upgrading to Ubuntu 13.10, running any program in Wine produces the following errors (via CLI): wine: Unhandled page fault on read access to 0x00000000 at address (nil) (thread 000f), starting debugger... wine: Unhandled page fault on read access to 0x00000000 at address (nil) (thread 0014), starting debugger... wine client error:14: write: Bad file descriptor err:wineboot:start_services_process Unexpected termination of services.exe - exit code -1073741819 (These also generate two popup windows saying that an undefined application has crashed). After this, the program I was trying to run in the first place executes as normal. Any idea how to fix this?

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  • Assign programs permanently to different sound-outputs in Pulseaudio?

    - by Mood
    I want to assign Skype input and output to my USB-headset while the rest of my laptop uses the internal sound-card. This is an easy task with PulseAudio Volume control (pavucontrol). The only problem I have is every time a call is made I manually have to set the output and input for Skype to my USB-device . When I hang up, Skype disappears from Volume Control. It reappears again with the next call only this time the default sound-card is selected again. It shouldn’t be hard to let PulseAudio look or the USB-headset is connected when Skype audio comes is before selecting the default. The way to do it is obvious not through Volume Control.

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  • Dependency problem while missing package is already installed

    - by hakermania
    I am trying to install a program but I am getting a dependency error. The error clearly points out: Dependency is not satisfiable: libc6-amd64 (>= 2.14) I went on to investigate and I found out that I have 2.19 version installed, actually: alex@MaD-pc:~$ apt-cache policy libc6-amd64 libc6-amd64:i386: Installed: 2.19-0ubuntu6 Candidate: 2.19-0ubuntu6 Version table: *** 2.19-0ubuntu6 0 500 http://us.archive.ubuntu.com/ubuntu/ trusty/main i386 Packages 100 /var/lib/dpkg/status Why am I getting this error if I already have this package? I also should probably mention that the system is 100% up to date. I run the updates and upgrades, restarted the system and then tried to install the package again with the same error popping up. Edit 1: I am using amd64 but I have installed some 32-bit libraries required by some program installed via wine if I recall correctly.

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  • What should NOT be included in comments? (opinion on a dictum by the inventor of Forth)

    - by AKE
    The often provocative Chuck Moore (inventor of the Forth language) gave the following advice (paraphrasing): "Use comments sparingly. Programs are self-documenting, with a modicum of help from mnemonics. Comments should say WHAT the program is doing, not HOW." My question: Should comments say WHY the program is doing what it is doing? Update: In addition to the answers below, these two provide additional insight. 1: Beginner's guide to writing comments? 2: http://programmers.stackexchange.com/a/98609/62203

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  • AMP 3.0 Mobility Platform

    Early adopter program available for Antenna's next-generation blend of AMP and Concert development environments Antenna - Radio - Shopping - Business - Telecommunication

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  • Upgrade from ubuntu 9.10 to 11.10

    - by Chinnu
    Our project definition is to develop CUDA programs. Our workstation has CUDA 3.1 installed in Ubuntu 9.10. We need to program in CUDA 5.0 which can be installed only on ubuntu 11.10 or 12.04. We tried upgrading but were faced with many problems as 9.10 is no longer supported. So we chose to proceed with a clean installation. Since we have a shared workstation, we need to back up the settings. We decided to use clonezilla for cloning the system. Booting from the LiveCD showed an unexpected error. Another option was to install 11.10 in an external HDD by partitioning it, but Gparted could not be installed and terminated with the error "installArchives() failed" which we couldn't solve even after modifying the sources.list. We are stuck either ways. Have no idea how to proceed and we have a deadline to submit our CUDA program. Any suggestion is welcome.

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  • The sign of a true manager is delegation (C# style)

    - by MarkPearl
    Today I thought I would write a bit about delegates in C#. Up till recently I have managed to side step any real understanding of what delegates do and why they are useful – I mean, I know roughly what they do and have used them a lot, but I have never really got down dirty with them and mucked about. Recently however with my renewed interest in Silverlight delegates came up again as a possible solution to a particular problem, and suddenly I found myself opening a bland little console application to just see exactly how far I could take delegates with my limited knowledge. So, let’s first look at the MSDN definition of delegates… A delegate declaration defines a reference type that can be used to encapsulate a method with a specific signature. A delegate instance encapsulates a static or an instance method. Delegates are roughly similar to function pointers in C++; however, delegates are type-safe and secure. Well, don’t you love MSDN for such a useful definition. I must give it credit though… later on it really explains it a bit better by saying “A delegate lets you pass a function as a parameter. The type safety of delegates requires the function you pass as a delegate to have the same signature as the delegate declaration.” A little more reading up on delegates mentions that delegates are similar to interfaces in that they enable the separation of specification and implementation. A delegate declares a single method, while an interface declares a group of methods. So enough reading - lets look at some code and see a basic example of a delegate… Let’s assume we have a console application with a simple delegate declared called AdjustValue like below… class Program { private delegate int AdjustValue(int val); static void Main(string[] args) { } } In a sense, all we have said is that we will be creating one or more methods that follow the same pattern as AdjustValue – i.e. they will take one input value of type int and return an integer. We could then expand our code to have various methods that match the structure of our delegate AdjustValue (remember the structure is int xxx (int xxx)) class Program { private delegate int AdjustValue(int val); private static int Dbl(int val) { return val * 2; } private static int AlwaysOne(int val) { return 1; } static void Main(string[] args) { } }  Above I have expanded my project to have two methods, one called Dbl and the other AlwaysOne. Dbl always returns double the input val and AlwaysOne always returns 1. I could now declare a variable and assign it to be one of those functions, like the following… class Program { private delegate int AdjustValue(int val); private static int Dbl(int val) { return val * 2; } private static int AlwaysOne(int val) { return 1; } static void Main(string[] args) { AdjustValue myDelegate; myDelegate = Dbl; Console.WriteLine(myDelegate(1).ToString()); Console.ReadLine(); } } In this instance I have declared an instance of the AdjustValue delegate called myDelegate; I have then told myDelegate to point to the method Dbl, and then called myDelegate(1). What would the result be? Yes, in this instance it would be exactly the same as me calling the following code… static void Main(string[] args) { Console.WriteLine(Dbl(1).ToString()); Console.ReadLine(); }   So why all the extra work for delegates when we could just do what we did above and call the method directly? Well… that separation of specification to implementation comes to mind. So, this all seems pretty simple. Let’s take a slightly more complicated variation to the console application. Assume that my project is the same as the one previously except that my main method is adjusted as follows… static void Main(string[] args) { AdjustValue myDelegate; myDelegate = Dbl; myDelegate = AlwaysOne; Console.WriteLine(myDelegate(1).ToString()); Console.ReadLine(); } What would happen in this scenario? Quite simply “1” would be written to the console, the reason being that myDelegate was last pointing to the AlwaysOne method before it was called. Make sense? In a way, the myDelegate is a variable method that can be swapped and changed when needed. Let’s make the code a little more confusing by using a delegate in the declaration of another delegate as shown below… class Program { private delegate int AdjustValue(InputValue val); private delegate int InputValue(); private static int Dbl(InputValue val) { return val()*2; } private static int GetInputVal() { Console.WriteLine("Enter a whole number : "); return Convert.ToInt32(Console.ReadLine()); } static void Main(string[] args) { AdjustValue myDelegate; myDelegate = Dbl; Console.WriteLine(myDelegate(GetInputVal).ToString()); Console.ReadLine(); } }   Now it gets really interesting because it looks like we have passed a method into a function in the main method by declaring… Console.WriteLine(myDelegate(GetInputVal).ToString()); So, what it the output? Well, try take a guess on what will happen – then copy the code and see if you got it right. Well that brings me to the end of this short explanation of Delegates. Hopefully it made sense!

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  • Awesome line up for SQLBits 8

    - by simonsabin
    We’ve got some really exciting things happening at SQLBits 8. I’ve been dying to tell everyone since I found out. The first is our line up from  Microsoft. We mentioned in the announcement of SQLBits that the SQLCAT team would be back. Well thats just the tip of the iceberg. Today we have announced that we will have the following speakers from the SQL Team. Mark Souza – General Manager for SQL Server Thomas Kejser - Senior Program Manager, SQL Server CAT Lubor Kollar – Principal Group Program...(read more)

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  • how to make new window always raise-up?

    - by user211923
    I got an issue of Ubuntu 13.10, the new created window does not always raise-up to the front. It is annoying, which makes me have to click the icons on unity launcher to focus on the new window. Furthermore, if I turn on a program which has already been opened, the system does not bring me to the program, only blinks its icon on the unity launcher. Again, I need to click the icon to get focus on the window. Seems the system does not smart enough to determine which window should be focused to. I'm pretty sure it did not happen in previous versions of Ubuntu. Any idea how to fix it?

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  • Ubuntu server 12.04 on AWS - How does the passwordless sudo work for the ubuntu user?

    - by aychedee
    I'm using Ubuntu server 12.04 on Amazon. I want to add a new user that has the same behaviour as the default ubuntu user. Specifically I want passwordless sudo for this new user. So I've added a new user and went to edit /etc/sudoers (using visudo of course). From reading that file it seemed like the default ubuntu user was getting it's passwordless sudo from being a member of the admin group. So I added my new user to that. Which didn't work. Then I tried adding the NOPASSWD directive to sudoers. Which also didn't work. Anyway, now I'm just curious. How does the ubuntu user get passwordless privileges if they aren't defined in /etc/sudoers. What is the mechanism that allows this?

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  • Where does ntpdate get its settings from and what is the "no servers can be used" error about?

    - by wilhil
    When I run ntpdate on its own, I get the following output: 8 Jun 15:47:46 ntpdate[31251]: no servers can be used, exiting If I run it with the -q ntp.ubuntu.com switch, it seems to query just fine. I have been hunting through many files and the most relevant one I have found is /etc/default/ntpdate, however, even with NTPDATE_USE_CONF set to no, I just can't understand/see how this error is occurring Any ideas? Update-- been looking non stop... It appears that ntupdate-debianworks fine and is the actual command that makes use of /etc/default/ntupdate, but, this doesn't answer the main question and I still can't find it...

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  • IIS isn't propagating domain

    - by ErocM
    I called Godaddy and 'verified' my settings for the two ips were correct. ns1.asezo.com = xx.xx.xx.15 ns2.asezo.com = xx.xx.xx.16 then I set the nameserver of asezo.com to the ns1/ns2 above, which Godaddy tech support says is right. When I try to visit my site, it says Oops! Google Chrome could not find asezo.com. When I try to ping the website, it gives me a time out. I have the bindings in IIS for the default website as: http - xx.xx.xx.15 - 80 www.asezo.com and http - xx.xx.xx.15 - 80 asezo.com And I'm still getting nothing. I can go directly to the ip http://xx.xx.xx.15/ and it gives me the IIS default website, I just can't get the url to propagate. What am I doing wrong?

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  • Naming interfaces for persistent values

    - by orip
    I have 2 distinct types of persistent values that I'm having trouble naming well. They're defined with the following Java-esque structure, borrowing Guava's Optional for the example and using generic names to avoid anchoring: interface Foo<T> { T get(); void set(T value); } interface Bar<T> { Optional<T> get(); void set(T value); } With Foo, if the value hasn't been set explicitly then there's some default value available or pre-set. With Bar, if the value hasn't been set explicitly then there's a distinct "no value" state. I'm trying to optimize the names for their call sites. For example, someone using Foo may not care whether there's a default value involved, only that they're guaranteed to always have a value. How would you go about naming these interfaces?

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  • how do you find a file's location?

    - by home-directory
    Noob here. OK, I 1 Open the Dash. 2 Type "file". An app appears, called "files", icon looks like ta 2-drawer file cabinet. I click that, the app opens 3: I click the "Search button". I type the file name in the box and hit Enter. 4: The program thinks for a while, then displays a result. Great! the program found the file I was ilooking for! IT knows where myfile.foo is, BUT I DON'T! IT DOESN'T F%*%#ING SAY WHERE IT IS!!!! How do I find out where it is, please? I hate to say this, but is there an app that works like Windows Explorer (but doesn't crash every 2 minutes)?

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  • Kindle for PC via Wine

    - by Mollikins
    I've been checking out all the free books on Amazon and I really want to get the Kindle PC program running on my computer so I can download, read, and manage my e-books. I realize that Calibre can be used to manage e-books and I do have that downloaded. However, Amazon won't let me download ebooks unless my PC is registered in their little Kindle program and I'd like to just keep things streamlined by playing by the rules for once. I've viewed so many tutorials and advice for setting it up. I have Wine, I have Kindle for PC, I set it to Win98, all of that. However, when I try to open KindlePC from the Wine menu or from the desktop icon, nothing happens. No error messages, nothing. I don't know what might be wrong. Please let me know if you have any experience with this and any suggestions!

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  • EPM 11.1.2 - Receive Anonymous Level Security token message in IE8 when trying to access Shared Services or Workspace URL

    - by Ahmed A
    If you get "Receive Anonymous Level Security token" message in IE8 when trying to access Shared Services or Workspace URL.Workaround:a. Go to Start > Run and enter dcomcnfgb. Expand Component Services, Expand Computers and right click on My Computer and select Propertiesc. Click on the Default Properties tab.  Change the Default Authentication Level to Connect.  Click apply and then OK.d. Launch the IE browser again and you will be able to access the URL.

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  • USB printer doesn't finish in 12.04

    - by 213441265152351
    I have an HP Deskjet 720C connected through a USB cable to an Ubuntu 12.04 laptop. When I plugged the printer for the first time into the fresh 12.04 laptop install, it auto-detected the printer correctly and choose the recommended drivers without a problem. The document print fine until they reach the end of the page, then suddenly stop just about the end leaving the page unfinished. I have checked that the margins are the correct ones. I have the latest version of cups installed. I have also tried changing the options of usb-unidir-default and usb-no-reattach-default via lpadmin, but the printing stops even earlier. Any ideas?

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  • Using OpenCl to jiggle the Pipe

    - by TOAOGG
    I've got the Idea to use OpenCL to program a simple Renderer. A clear contra is, that this approach won't benefit from the hardware as the functions on the device (I think). Would it be useful to do this in OpenCL..lets say we want to Cull as early as possible so we won't have many per vertex operations. Is it correct, that Culling is done after the Vertex-Shader? For static-vertecies who won't get effected by the shader it could be interesting to cull them before. Another idea would be an deferred renderer. So the main question is: Would it make sense to program a renderer in OpenCL (aside the effort)? The resulting picture would be drawn in OpenGL.

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  • If you need more than 3 levels of indentation, you're screwed?

    - by jokoon
    Per the Linux kernel coding style document: The answer to that is that if you need more than 3 levels of indentation, you're screwed anyway, and should fix your program. What can I deduct from this quote? On top of the fact that too long methods are hard to maintain, are they hard or impossible to optimize for the compiler? I don't really understand if this quote encourages better coding practice or is really a mathematical / algorithmic sort of truth. I also read in some C++ optimizing guide that dividing up a program into more function improves its design is a common thing taught at school, but it should be not done too much, since it can turn into a lot of JMP calls (even if the compiler can inline some methods by itself).

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  • 12.10 starts up to just my desktop background [closed]

    - by Alex
    Possible Duplicate: Unity does not start after installing the fglrx drivers on 12.10 I have only just started using linux more than just instlling it on an old pc for fun and have just changed the driver settings from the default option. The computer starts up and goes through everything else well, but at slightly lower resolution. Once signing on to Ubuntu, it only displays my desktop background and cursor. Can i restore it to the default driver settings? I've spent a while transferring files and don't want to reinstall Ubuntu.

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  • WWDC 2010 : Apple présente Safari 5 pour Mac et Windows, plus rapide et avec de nouvelles options po

    WWDC 2010 : Apple annonce Safari 5 pour Mac et Windows, le navigateur est plus rapide et disponible au téléchargement Apple vient de présenter et rendre disponible au téléchargement son nouveau navigateur. 30% plus rapide que Safari 4, 3% plus rapide que Google Chrome, Safari 5 permet de choisir parmi les moteurs de recherche Google, Yahoo! ou Bing. Les outils intégrés pour les développeurs ont été améliorés, de même que le support du HTML5 (plus de détails plus bas). Mais la grosse nouveauté est qu'avec Safari 5, Apple annonce également la possibilité pour les développeurs de créer des extensions à Safari. En plus de l'iPhone developer program à 99$/an et du Mac developer program, à 99$...

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