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• How to manually detect deadlocks

  - by Dawson

  I understand the concepts of deadlock well enough, but when I'm given a problem like the one below I'm not sure how to go about solving it. I can draw a resource allocation graph, but I'm not sure how to solve it from there. Is there a better more formal way of solving this? Consider a system with five processes, P1 through P5, and five resources, R1 through R5. Resource ownership is as follows. • P1 holds R1 and wants R3 • P2 holds R2 and wants R1 • P3 holds R3 and wants R5 • P4 holds R5 and wants R2 • P5 holds R4 and wants R2 Is this system deadlocked? Justify your answer. If the system is deadlocked, list the involved processes.

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• Kansas City SQL Saturday 2012: BBQ Crawl

  - by Bill Graziano

  The next Kansas City SQL Saturday is coming up on August 4th.  We’ll have the usual SQL Saturday goodness: lots of technical sessions, great networking events and a fantastic speaker dinner.  And we’ll have the Third Annual Kansas City SQL Saturday BBQ Crawl.  On Friday afternoon we’ll visit a few BBQ places in town.  We tend to order big sampler plates and just share everything around.  It’s a great way to try a variety of styles.  This year we’ll be hitting an all new selection of BBQ joints. You don’t need to be a speaker to attend.  However the call for speakers is open until June 28th (hint, hint).  Locals and out-of-towners are all welcome. If you’re interested in attending send me an email and I’ll get you added to the list. We finish in plenty of time to get you to the speaker dinner – as if you could eat any more.

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• EAV - is it really bad in all scenarios?

  - by Giedrius

  I'm thinking to use EAV for some of the stuff in one of the projects, but all questions about it in stackoverflow end up to answers calling EAV an anti pattern. But I'm wondering, if is it that wrong in all cases? Let's say shop product entity, it has common features, like name, description, image, price, etc., that take part in logic many places and has (semi)unique features, like watch and beach ball would be described by completely different aspects. So I think EAV would fit for storing those (semi)unique features? All this is assuming, that for showing product list, it is enough info in product table (that means no EAV is involved) and just when showing one product/comparing up to 5 products/etc. data saved using EAV is used. I've seen such approach in Magento commerce and it is quite popular, so may be there are cases, when EAV is reasonable?

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• Show Ubuntu logo in Byobu (tmux) status bar?

  - by RSoul

  For some reason my Byobu (tmux) status bar is showing TAB instead of the ubuntu logo. This: where it should be this: I've tried installing some different fonts, but have not corrected the issue yet. Any ideas? Further information: sudo apt-get install ttf-ubuntu-font-family Reading package lists... Done Building dependency tree Reading state information... Done ttf-ubuntu-font-family is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. Update: fc-list on my computer shows all the fonts with the prefix /usr/share/fonts/ e.g., /usr/share/fonts/truetype/ubuntu-font-family/UbuntuMono-R.ttf: Ubuntu Mono:style=Regular But the same command on a working system shows fonts listed thus: Ubuntu Mono:style=Bold Italic Perhaps it's a font location problem?

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• Logic or Algorithm to solve this problem [closed]

  - by jade

  I have two lists. List1 {a,b,c,d,e} and List2 {f,g,h,i,j} The relation between the two list is as follows a->g,a->h,h->c,h->d,d->i,d->j Now I have these two lists displayed. Based on the relation above on selecting element a from List1, List2 shows g,h. On selecting h from List2, in List1 c,d are shown in List1. On selecting d from List1 it shows i,j in List2. How to trace back to initial state by deselecting the elements in reverse order in which they have been selected?

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• What are some tablets that can run Ubuntu?

  - by tacozmeister

  I can't believe I'm actually asking this, but what are some good, cheap tablets that can run Ubuntu? I'm considering getting a tablet, but I don't really want an expensive one like an iPad. And I love Ubuntu. So what tablets are out there that are cheap, but can also run Ubuntu 12.04 without much lag if it's installed after purchase? Personal anecdotes would be appreciated! Note: I'm not asking you to help me shop, just to formulate a list of tablets (+personal preference) that can use Ubuntu.

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• Did You Know Facebook Has Built-In Shortcut Keys?

  - by The Geek

  I was spending some time browsing around Facebook today (translation: wasting time), when I noticed that they have some shortcut keys for navigating around the site using the keyboard, so I put together a list for everybody. Note: for each of these shortcut keys, if you’re using Firefox, you’ll need to use Shift+Alt instead of just Alt, and for Internet Explorer you’ll need to hit the Enter key after the shortcut to trigger it. If you’re using a Mac, you’ll need to use Ctrl+Opt instead of Alt Latest Features How-To Geek ETC How To Boot 10 Different Live CDs From 1 USB Flash Drive The 20 Best How-To Geek Linux Articles of 2010 The 50 Best How-To Geek Windows Articles of 2010 The 20 Best How-To Geek Explainer Topics for 2010 How to Disable Caps Lock Key in Windows 7 or Vista How to Use the Avira Rescue CD to Clean Your Infected PC 2011 International Space Station Calendar Available for Download (Free) Ultimate Elimination – Lego Black Ops [Video] BotSync Enables Secure FTP File Synchronization on Android Devices Enjoy Beautiful City Views with the Cityscape Theme for Windows 7 Luigi Installs Any OS on Google’s Cr-48 Notebook DIY iPad Stylus Offers Pen-Based Interaction on the Cheap

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• PAE on Ubuntu 12.04

  - by JamesStewy

  I am having trouble using PAE on Ubuntu 12.04 LTS 32bit. I recently upgraded from 4 to 8gb of RAM but PAE doesn't appear to have picked this up. When I run "grep --color=always -i PAE /proc/cpuinfo" I get pae in the list. When I run "dmidecode | grep Size | grep MB" Installed Size is 3825 but the Maximum Total Memory Size: 8192 MB. When I check the BIOS it says there is 8192 MB available and the computer fully supports I have followed everything I can find on the internet (including this https://help.ubuntu.com/community/EnablingPAE) and nothing is working. My Computer is a Toshiba Portege m750. It has an Intel Centrino Core 2 Duo processor. Bought in 2009 Thanks, JamesStewy

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• What is a *slightly* less extreme equivalent to being "fluent" in a language?

  - by Mehrdad

  tl;dr: What is a less extreme (but still noticeable) alternative to the word "fluent", when saying e.g. "I am fluent in C++/Python/whatever?" I think I can call myself "fluent" in C#, because I know the language and runtime very well, and I'm very familiar with the .NET framework's APIs and classes, etc. I would like to claim the same thing for Python and C++. But while I can program in Python (I did so for an entire summer, making a website with Django), for example, I would not call myself fluent because my code isn't always "Pythonic" (e.g. using map/filter vs. list comprehensions), and I'm not too intimate with some aspects of the language and standard library yet (e.g. the introspection API, etc.). Is there a word or phrase I can use on e.g. a resume to describe what I know? I can think of "very familiar with", but is there a better word/phrase I can use?

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• Most supported/easiest to get started gamedev language?

  - by user1009013

  In what language are the most libraries/frameworks (like lwjgl for Java, XNA for C#)? What language is the easiest to start making a game (very easy to get a 3D-environment rendered)? What language has the friendliest learning curve? Say I want to make a game and I don't know any programming languages, I want to develop for any platform(so don't give the answer "the one you know best/the platform you are working on"), then what is the best language to start with. I get this question a lot "I have this and that ideas for a game and want to make it, what language should I use"(mostly asked by beginning programmers), but I don't know how to answer that. The answer "use the one you are most familiar with", because sometimes they don't even know a language yet... I am not asking for someone's personal opinion, but an objective list of what languages are the easiest/most supported/have the most/best libraries/frameworks to get started with gamedevelopment.

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• Wireless problems on HP

  - by Sat93

  I'm not able to enable Wireless using the hardware switch on my HP ProBook4430s. Because of this the Enable Wireless option is greyd out and I cannot enable it. The greyd out option can be seen in the screenshot below. The results of iwconfig for my system are as follows, lo no wireless extensions. wlan0 IEEE 802.11bgn ESSID:off/any Mode:Managed Access Point: Not-Associated Tx-Power=off Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off eth0 no wireless extensions. Also I tried to do the following, sudo ifconfig wlan0 up but I got an error as below, SIOCSIFFLAGS: Operation not possible due to RF-kill Also the result of sudo rfkill list all for my system is as follows, 0: phy0: Wireless LAN Soft blocked: no Hard blocked: yes 1: hp-wifi: Wireless LAN Soft blocked: no Hard blocked: no 2: hp-bluetooth: Bluetooth Soft blocked: no Hard blocked: no 3: hci0: Bluetooth Soft blocked: no Hard blocked: no How do I fix this problem? Thanku!

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• Read an object from compressed file generated from ActionScript 3

  - by Last Chance

  I have made a simple game Map Editor and I want to save a array that contain map tile info to a file, as below: var arr:Array = [.....2d tile info in it...]; var ba:ByteArray = new ByteArray(); ba.writeObject(arr); ba.compress(); var file:File = new File(); file.save(ba); I had successfully saved a compressed object to a file. Now the problem is my server side need to read this file and decompress the array out from the file, then convert it to a Python list. Is that possible?

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• Only one resolution available in Xorg.conf

  - by Kévin Guilbeault

  I recently upgraded to Ubuntu 12.10 and when I try to change my resolution in NVIDIA X server settings, I only get the native one (1600x900). When I had 12.04 installed, all resolutions were available in the drop down list. My goal is to have twinview working again. I used to set my two screens to twinview and clones, using my HDTV resolution (1360x768) which was previously available in 12.04 for my laptop screen too. In 12.10, I tried to install all of the NVIDIA drivers available except the nouveau driver. I tried to add a new mode using Xrandr --newmode / --addmode, but it didn't work; it coudn't detect my output. I'd like to know if this is a known bug and if there's something to do with that. Thanks!

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• I want to fix a bug. Where do I start?

  - by Ingo Gerth

  Although I am not a professional programmer, I have written a program or two. Yet, nowadays every engineer and scientist learns to program a bit as well, and as such I am used to writing programs in Python, C and MATLAB. Now I want to give back a bit to Ubuntu and its great folks and fix a bug! I had a look at the list of the bitesize campaign and had to find that most of them are not that easy for me to fix as I suspect they require a lot of time to get into the matter, and I do not have that. Still I discovered this one and it looks manageable and like a cool feature to me. As I have never written a patch or released a program to the wild before though, I have no idea where to start. What should be my first step to tackle that problem? Bottom line: Where and how do I start fixing that guy?

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• play sound from different applications on different output devices (speakers, headphones)

  - by Mike

  I want music (played e.g. via Audacious) to be played on speaker system, and all other sounds produced by other applications (including ubuntu sound effects) to be played on headphones. My computer has sound connectors at its back, and also connectors on its front panel. When I connect both headphones and speakers, only headphones work (I take it, the front connectors take precedence?). Should I purchase another sound card (in addition to the motherboard-integrated sound I have)? When I go to Audacious output settings, I see only the ouput plugin selection list, with PulseAudio selected and options like ALSA, OSS4 etc. But there's no facility to select particular output device (and I guess it wouldn't magically appear even if I had the second soundcard). Is this at all possible to bind specific application to particular output device?

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• What does it mean for SVN "to pollute the local source tree"?

  - by asd

  I'm reading "Professional Team Foundation Server 2010" by Wrox, and in an advantages/disadvantages list, the said: "Like CVS, SVN makes use of .svn directories inside the source folders to store state of the local working copy, and to allow synchronization with the server. However, it can have the affect of polluting the local source tree, and can cause performance issues wiht very large projects or files." What does the bit about pollution mean? I've used SVN for C# & ASP.NET projects for a long time and haven't encountered any problems. What probably does this quote think I should have been watching out for?

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• How can I really master a programming language?

  - by cprogcr

  I know that learning a language, you can simply buy a book, follow the examples, and whenever possible try the exercises. But what I'm really looking is how to master the language once you've learned it. Now I know that experience is one major factor, but what about learning the internals of the language, what is the underlying structure, etc. There are articles out there saying read this book, read that book, make this game and that game. But to me this doesn't mean to master a language. I want to be able to read other people's code and understand it, no matter how hard that is. To understand when to use a function and when another, etc etc. The list could go on and on but I believe I've made the point. :) And finally, take whatever language as an example if needed, though best would be if C was taken as an example.

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• I need a flexible VPS like gandi.com [duplicate]

  - by Sharen Eayrs

  This question already has an answer here: How to find web hosting that meets my requirements? 5 answers What are the alternative? I do not ask for which one you recommend. I am simply asking for list of similar service. That being said if there is any you've used and happy with please let me know. This is what I am considering http://en.gandi.net/ Some says it's overpriced. It's like amazon aws I think. So I need VPS hosting where I can easily change the CPU requirement, etc.

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• Why can't I get into my repositories?

  - by ken1943

  Upgraded from 10.04 to 10.10 by mistake and am having problems with some of my programs. They either don't work or they disappear from view on the screen. The Repositories menu item in Synaptic Packages Manager is a case in point. The computer does nothing when I choose this item. I am locked out of unless I edit /etc/apt/sources.list. The rest of the application seems to work, however. Update Manager just flashes on screen then disappears without doing, as does Printing. How do I downgrade from a higher to a lower level repository? I need to downgrade from 10.10 to 10.04. Each time Ubuntu upgrades to 10.10 evil things happen and the operating system really gets messed up. I really do not want to have to erase and install my operating system all over again if I can help it.

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• On-board HDMI Audio

  - by TrackStar

  I have tried searching for answers to this issue but have had no luck. My HDMI display is working but I have no audio from the HDMI .There is no option for HDMI under sound preferences hardware or output. Purging and re-installing pulse audio doesn't change anything. I am using the on-board HDMI port on my motherboard, I do not have a PCI graphics card installed. CPU: i7-3770 Mobo: Asus Sabertooth z77 Kernel: 2.6.39-3-bb03 running aplay -l returns ** List of PLAYBACK Hardware Devices ** card 0: Intel [HDA Intel], device 0: ALC892 Analog [ALC892 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: Intel [HDA Intel], device 1: ALC892 Digital [ALC892 Digital] Subdevices: 1/1 Subdevice #0: subdevice #0 Seems as if the system doesn't even recognize the possibilty of HDMI audio output. Any ideas?

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• How to remove shells?

  - by MyNameIs...

  I installed few shells that I wanted to try out on Ubuntu 12.04, but none of them worked at all. It could be that I installed them all at the same time, meaning the OS didn't get a chance to work everything out, but either way, they didn't work. I would now like to remove them. The one's that I installed are Fluxbox, OpenBox, XFCE, and MATE. I installed them through the help of this site. Everything seemed to have been working properly until I actually tried to use the shells and nothing loaded at all. Except for Fluxbox, I think that one worked. I want to know of any way to repair or perhaps just remove the packages entirely. I might have already removed them because I did the apt-get remove command on all of them, but they were still in the list on the login screen.

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• Easy QueryBuilder - A User-Friendly Ad-Hoc Advanced Search Solution

  Constructing an easy and powerful QueryBuilder interface becomes more important for complex data grid filtering and accurate reporting services. In this article, I'll discuss how to build a query search engine using ASP.NET AJAX and dynamic SQL. The main goal is to provide an interactive interface to allow users select query attributes, operators, attribute values, and T-SQL operators so that the data context query list can be easily composed and a search engine is invoked.Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Is the tap-to-click issue solved

  - by AWE

  I'm just an average Joe when it comes to computing (maybe less then the average Joe) but I hate tap-to-click. In system and settings there is no touchpad tab? Is it true that this has been fixed? I'm using Dell inspiron N5110 xinput list: ? Virtual core pointer id=2 [master pointer (3)] ? ? Virtual core XTEST pointer id=4 [slave pointer (2)] ? ? PS/2 Generic Mouse id=13 [slave pointer (2)] This is really strange because Dell is one of the top manufacturers in laptops and Ubuntu one of the top distros in Linux and Canonical claims that they are working closely with Dell.

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• What Application Indicators are available?

  - by user8592

  I installed Ubuntu 11.04 on one of my systems and I am using the Unity interface. Unity is working quite well so far but I really miss panel applets for net speed, cpu temp, and system monitor. These applets are useful for viewing quick info. Unlike 10.10, there is no other way to get this info onto the panel or unity launcher. There are solutions like screenlets and conky but they don't feel appropriate for a clean desktop look. If you know one then please list out any third party indicators with links so that they can be found.

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• read object from compressed file that generate from actionscript3

  - by Last Chance

  I have made a simple game Map Editor, and I want to save a array that contain map tile info to a file, as below: var arr:Array = [.....2d tile info in it...]; var ba:ByteArray = new ByteArray(); ba.writeObject(arr); ba.compress(); var file:File = new File(); file.save(ba); now I had successful save a compressed object to a file. now the problem is my server side need to read this file and decompress get the arr out from file, then convert it as python list. is that prossible?

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