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  • MySQLwith mutiple threads and processes

    - by Abhan
    I'm developing a telecom messaging platform in C, and I'm going to need multiple processes to be working with MySQL DB. How can I make two processes read/write to/from a Mysql DB and, if/when one of them goes down, get the other to seamlessly take over the work until the dead process gets back to work? I was thinking/googling some options and am stuck in place where I don't know which one to choose. What I think so far is that table lock is not the best option to go for, as it will stall the other process until the table is unlocked. The other option is to use row-level locks or manual locks, but I can't find the best way to do it.

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  • Identifying which pattern fits better.

    - by Daniel Grillo
    I'm developing a software to program a device. I have some commands like Reset, Read_Version, Read_memory, Write_memory, Erase_memory. Reset and Read_Version are fixed. They don't need parameters. Read_memory and Erase_memory need the same parameters that are Length and Address. Write_memory needs Lenght, Address and Data. For each command, I have the same steps in sequence, that are something like this sendCommand, waitForResponse, treatResponse. I'm having difficulty to identify which pattern should I use. Factory, Template Method, Strategy or other pattern. Edit I'll try to explain better taking in count the given comments and answers. I've already done this software and now I'm trying to refactoring it. I'm trying to use patterns, even if it is not necessary because I'm taking advantage of this little software to learn about some patterns. Despite I think that one (or more) pattern fits here and it could improve my code. When I want to read version of the software of my device, I don't have to assembly the command with parameters. It is fixed. So I have to send it. After wait for response. If there is a response, treat (or parse) it and returns. To read a portion of the memory (maximum of 256 bytes), I have to assembly the command using the parameters Len and Address. So I have to send it. After wait for response. If there is a response, treat (or parse) it and returns. To write a portion in the memory (maximum of 256 bytes), I have to assembly the command using the parameters Len, Address and Data. So I have to send it. After wait for response. If there is a response, treat (or parse) it and returns. I think that I could use Template Method because I have almost the same algorithm for all. But the problem is some commands are fixes, others have 2 or 3 parameters. I think that parameters should be passed on the constructor of the class. But each class will have a constructor overriding the abstract class constructor. Is this a problem for the template method? Should I use other pattern?

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  • E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution)

    - by B Jo
    I would like to upgrade to Ubuntu 13.04 since almost a month now. Am a pretty novice in linux and in software in general. My /boot is full : bijo@bijo-AMILO-Xi-2428:~$ df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/ubuntu-root 228G 7.7G 208G 4% / udev 1001M 4.0K 1001M 1% /dev tmpfs 404M 836K 403M 1% /run none 5.0M 0 5.0M 0% /run/lock none 1008M 156K 1008M 1% /run/shm none 100M 48K 100M 1% /run/user /dev/sda1 228M 222M 0 100% /boot I tried the : sudo apt-get purge $( dpkg --list | grep -P -o "linux-image-\d\S+" | grep -v $(uname -r | grep -P -o ".+\d") ) but i got this as reply E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). infact I'm going round and round ... Can someone guide me through please? Thanks in advance for ur time

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  • How to make Runescape work on 12.04?

    - by Alex
    I'm trying to play Runescape on Chromium, but it runs really slowly. I have IcedTea Java from the Software Center. I had to install it for the game to work at all, but it's not playable. Does anyone have some good settings for me to use, or do I need a better way to have Java and Chromium work together so Runescape can run? Memory: 4.8GB CPU: AMD Athlon(tm) II X4 620 Processor × 4 GPU: Gallium 0.4 on NV50 (driver) = Geforce 8800 GTS OS type: 64bit

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  • Change administrator username

    - by Fazlan
    I have accidentally typed my name wrong when I created the administrator account. Although I managed to change the user name at the login screen, I am unable to rename the /home/oldusername to /home/newusername. I tried most of the online tutorials, and it failed. The code I tried was this: usermod -l newusername -m -d /home/newusername oldusername But the output is: cannot lock /etc/passwd; try again later. How can I fix the issue and change the folder to newusername and expect all the applications to work as before?

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  • Ubuntu Philosophy Question

    - by The-Ever-Kid
    I was just switching from Windows to Ubuntu and I started to read this. And there were quite a few things I did not understand one was : "OpenOffice decided not to have a learning curve" And "Firefox tries very hard to make sure pages written in 1995 look like they did in 1995. " And Finally "Windows isn't a poor man's Linux." In the final statement shouldn't the statement be the opposite.

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  • Title Tag Optimization For SEO - (Search Engine Optimization)

    In this article we have discussed the importance of the title tag in search engine optimization and further we have discussed important techniques for the title tag optimization that can get good results for search engine optimization. Title tag optimization can play a dramatic role in increasing the ranking of a web page in search engine results pages.

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  • Ranking on the First Page in Search Engines

    How important is it to rank on the first page of the search result pages displayed by search engines when keywords are typed in and the enter key is pressed? This is a question that every website administrator must have asked himself at least a zillion times during the course of optimizing his website and continues to ask himself even though his website has been fully optimized and it has achieved a ranking on the search engines.

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  • Is it possible to increase the levels of abstraction I can hold in my head/reason about at once? How would I go about this? [closed]

    - by invaliduser
    I'd like to be able to read through fifteen pages of assembly code and know what it does. I'd like to be able to write programs that write programs that write programs that write programs. We've made a lot of strides in taking load off our brains by with good tools (Chrome dev mode/Firebug for web stuff, REPL's for many languages, IDEs), but I'd like my brain to be able to handle a bigger load, as opposed to paring the load down with tools.

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  • Upcoming eSeminars by PTS

    - by Javier Puerta
    The following eSeminars by PTS are already scheduled. Click on the links for more info and registration eSeminar - Oracle Database In-Memory Option August 29, 2014 @10:00am CEST ">(maximum duration 1 hour) September 29,2014 @10:00am CEST (maximum duration 1 hour) eSeminar - Oracle Database Multitenant option September 12, 2014 @10:00am CEST (maximum duration 1 hour) Learn from the experts!

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  • Upcoming eSeminars by PTS

    - by Javier Puerta
    The following eSeminars by PTS are already scheduled. Click on the links for more info and registration eSeminar - Oracle Database In-Memory Option August 29, 2014 @10:00am CEST ">(maximum duration 1 hour) September 29,2014 @10:00am CEST (maximum duration 1 hour) eSeminar - Oracle Database Multitenant option September 12, 2014 @10:00am CEST (maximum duration 1 hour) Learn from the experts!

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  • The SEO Basics

    Search Engine Optimization or SEO is indeed an essential part of web marketing as it can help you promote your site by optimizing web pages or your entire website so that it will be able to get a higher position in search results. Although this can help you a lot in promoting your website, it cannot be a guarantee that your website will be able to get high ranking in search results especially if you are ignoring the basic rules.

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  • Google Analytics content experiment vs. funnel visualization

    - by Full Decent
    I am running an experiment on one of the pages in my funnel (the "Choose shipping options" page). But the numbers on the different reports do not correspond. First, I am expecting the 70 entrances in the funnel to equal the 131 experiment visits. Also, I expect the 23 conversions in the funnel to match the 21 transactions below. But they do not. How should I read this information to make good decisions?

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  • Android : les API ne peuvent être soumises au Copyright, décide le juge chargé de l'affaire, Oracle compte faire appel

    Android : les API ne peuvent être soumises au Copyright Décide le juge chargé de l'affaire, Oracle compte faire appel Mise à jour du 04 juin 2012 par Idelways Encore un dur revers pour Oracle qui revient bredouille, ou presque, de la rude bataille juridique qu'il a déclarée à Google et à son Android. Le juge William Alsup (développeur lui aussi à ses heures perdues) vient de prononcer le verdict de l'affaire dans un document de 41 pages. Il y explique qu'en dépit de la nature « ingénieuse » des éléments qui con...

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  • JHeadstart search with default values

    - by christian.bischof
    JHeadstart has a powerful generator for ADF Faces pages. One of the features of the generator is the generation of search functionality into a page. The search functionality offers a "Quicksearch" with a single search item and an "Advanced Search" for multiple search criteria. Sometimes it would be nice to have initial values for the search criteria, but this is not supplied by JHeadstart by default.

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  • EntityDataSource Control Basics

    The Entity Framework can be easily used to create websites based on ASP.NET. The EntityDataSource control, which is one of a set of Web Server Datasource controls, can be used to to bind an Entity Data Model (EDM) to data-bound controls on the page. Thse controls can be editable grids, forms, drop-down list controls and master-detail pages which can then be used to create, read, update, and delete data. Joydip tells you what you need to get started.

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  • Has Your Site Been Sandboxed?

    In the first place, you want to avoid getting in to the 'box, and there are several ways this can be done. The first thing you should do is to be careful about how many links you get in the beginning. Submitting your new site to thousands of directories is sure to trigger some filters because it's not seen as natural. Similarly, a new site with thousands of pages could trigger a filter because websites generally grow over time.

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  • It is a Good Idea to Buy Backlinks

    Have you heard of backlinks? These are specific links from other websites that come to your website with the purpose of linking due to relevance in terms of content or in terms of merchandise, etc. For instance, if you are a modern art artist and specialize in customized art work, then you can have your service posted on relevant web pages, like an arts and craft website, etc.

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  • How to specify importance of html elements?

    - by Julien Fouilhé
    Is it possible to specify what elements of the page are important, or, more specifically, what elements of the page are not important? I'm using HTML5 new elements (nav, header, footer, section, article, aside...), but in the description of the website, there's sometimes my login form (in the header of my page though) in the Google description of my website pages... Is there a solution to resolve this problem? Thank you.

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  • CUPS Authentication for Admin on localhost:631 interface

    - by Tony Kruse
    I have searched quite a bit, saw the one response that purported to have a solution to this but it did not work in my case. My Brother printer is not shown in CUPS so I go to Admin-Add Printer it gives me the User Name/Password popup with refuses to recognize my user name on the machine. This is a brand new install of 13.1. My Restrict Access to the admin pages section has: Order allow, deny Allow localhost

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  • Avoiding and Identifying False Sharing Among Threads

    In symmetric multiprocessor (SMP) systems, each processor has a local cache. The memory system must guarantee cache coherence. False sharing occurs when threads on different processors modify variables that reside on the same cache line. Learn methods to detect and correct false sharing.

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