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  • Use the right tool for the job: embedded programming

    - by EmbeddedProg
    I'm interested in programming languages well suited for embedded programming. In particular: Is it possible to program embedded systems in C++? Or is it better to use pure C? Or is C++ OK only if some features of the language (e.g. RTTI, exceptions and templates) are excluded? What about Java in this domain? Thanks.

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  • Do you have to pay for GNU GPL software that is "for sale"?

    - by DisgruntledGoat
    I've seen some software (a Joomla component, to be exact) for sale on a web site. The web site says it is licensed under the GNU GPL2. However it also says you need to pay for every site you use the software on (with bulk discounts). I know it's perfectly acceptable to sell software under the GPL, however the license implies that the source code must be distributed at no cost. So is this a legitimate use of the GPL, or is it violating the license? Is it legal to download the software for free (say, from Bittorrent) and use it as I wish?

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  • Custom DDL Templates for Visual Studio 2010

    - by Stacey
    I was wondering if anyone knows of some good community distributed custom DDL templates for Entity Framework 4.0. The default DDL to SQL10 Works well enough, but we're looking to do some customization to the naming convention that it just isn't offering us. I'm not really finding many samples out there of people doing this, so I was hoping someone might know of a resource I'm overlooking (perhaps I am searching for it wrong, or misunderstanding how the whole process works) Specifically we're wanting to change up how it writes out fields from relationships. For instance, the default template puts in.. tablename_propertyendpoint_propertyname. We're wanting to find tune this to our naming scheme a little more. And none of us can quite figure out where in the .tt files it is doing this exact behavior.

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  • If i write in assembly or machine language, will the program work on any computer with a compatible processor?

    - by user663425
    Basically, i'm wanting to know if i can use either machine or assembly language to write a program that will work on any computer with an x86 processor, despite differences in operating systems. For example, you run a program and no matter what computer it's on, it'll display "Hello, World!" I know it's a little crazy to want to know either of these to languages, but i figure it's an incredible thing to learn, so why not?

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  • Fonts in a multi-platform environment

    - by Stephen Burke
    What is the best way to deal with fonts in a multi-platform distributed system? If I want to use a common font across all systems to show to the user, what's the best way to do this. From the little I've been reading each platform looks to have fonts that are of the same family (ie serif, sans-serif) but with different names. CSS looks to have the functionality baked in where it will make the best selection it can of font on the users machine. Is there similar functionality either in system libraries or external libraries for Windows & Linux. I'm using C++ mainly? Can someone point me in the right direction for documentation as well? Thanks

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  • Java: Do something on event in SQL Database?

    - by wretrOvian
    Hello I'm building an application with distributed parts. Meaning, while one part (writer) maybe inserting, updating information to a database, the other part (reader) is reading off and acting on that information. Now, i wish to trigger an action event in the reader and reload information from the DB whenever i insert something from the writer. Is there a simple way about this? Would this be a good idea? : // READER while(true) { connect(); // reload info from DB executeQuery("select * from foo"); disconnect(); }

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  • Real World Examples of read-write in concurrent software

    - by Richard Fabian
    I'm looking for real world examples of needing read and write access to the same value in concurrent systems. In my opinion, many semaphores or locks are present because there's no known alternative (to the implementer,) but do you know of any patterns where mutexes seem to be a requirement? In a way I'm asking for candidates for the standard set of HARD problems for concurrent software in the real world.

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  • Game network physics collision

    - by Jonas Byström
    How to simulating two client-controlled vehicles colliding (sensibly) in a typical client/server setup for a network game? I did read this eminent blog post on how to do distributed network physics in general (without traditional client prediction), but this question is specifically on how to handle collisions of owned objects. Example Say client A is 20 ms ahead of server, client B 300 ms ahead of server (counting both latency and maximum jitter). This means that when the two vehicles collide, both clients will see the other as 320 ms behind - in the opposite direction of the velocity of the other vehicle. Head-to-head on a Swedish highway means a difference of 16 meters/17.5 yards! What not to try It is virtually impossible to extrapolate the positions, since I also have very complex vehicles with joints and bodies all over, which in turn have linear and angular positions, velocities and accelerations, not to mention states from user input.

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  • Out of browser silverlight 4 application with local database that will run and install on windows or

    - by user360894
    I am researching using silverlight 4 to develop a desktop application that can be installed from a browser window, now the tricky part is that I want a lightweight database embedded into the application. The database should install with the rest of the application and it should ideally work on both windows and mac systems. Originally I was thinking sqlite would be suitable for this but I have learned that it is not compatible with silverlight. Does anyone know of a solution for this?

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  • How to schedule hundreds of thousands of tasks?

    - by wehriam
    We have hundreds of thousands of tasks that need to be run at a variety of arbitrary intervals, some every hour, some every day, and so on. The tasks are resource intensive and need to be distributed across many machines. Right now tasks are stored in a database with an "execute at this time" timestamp. To find tasks that need to be executed, we query the database for jobs that are due to be executed, then update the timestamps when the task is complete. Naturally this leads to a substantial write load on the database. As far as I can tell, we are looking for something to release tasks into a queue at a set interval. (Workers could then request tasks from that queue.) What is the best way to schedule recurring tasks at scale? For what it's worth we're largely using Python, although we have no problems using components (RabbitMQ?) written in other languages.

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  • How to manage reports/files distribution to different destinations in Unix?

    - by mossie
    The reporting tools will generate a huge numbers of reports/files in the file system (a Unix directory). There's a list of destinations (email addresses and shared folders) where a different set of reports/files (can have overlap) are required to be distributed at each destinations. Would like to know if there's a way to efficiently manage this reports delivery using shell scripts so that the maintenance of the list of reports and destinations will not become a mess in future. It's quite an open ended question, the constraint however is that it should work within the boundaries of managing the reports in a Unix FS.

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  • Python: What's a correct and good way to implement __hash__()?

    - by random-name
    What's a correct and good way to implement hash()? I am talking about the function that returns a hashcode that is then used to insert objects into hashtables aka dictionaries. As hash() returns an integer and is used for "binning" objects into hashtables I assume that the values of the returned integer should be uniformly distributed for common data (to minimize collisions). What's a good practice to get such values? Are collisions a problem? In my case I have a small class which acts as a container class holding some ints, some floats and a string.

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  • Squid logs on mongodb

    - by user306241
    Hi, I'm planning to log my squid instances to a mongodb, but the actual problem is that we have a huge traffic to be logged, every access authenticated with user/pass. Eventually we have to make some reports based on logs. I was thinking to insert the logs distributed by months and by users, so my collection will look like this: {month: 'april', users: [{user: 'loop0', logs: [{timestamp: 12345678.9, url: 'http://stackoverflow.com/question/ask', ... }]}] So if I want to generate my reports based on the month of april I just have to get the right month instead of looking in zillions of lines to fetch the lines that timestamp match between April, 1 and April, 30. Of course this type of insert will be slower than just insert the log line directly. So my question is: is there a best way to do this? Nowadays we have around 12 million lines of log by day.

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  • How to access constant defined in child class from parent class functions?

    - by kavoir.com
    I saw this example from php.net: <?php class MyClass { const MY_CONST = "yonder"; public function __construct() { $c = get_class( $this ); echo $c::MY_CONST; } } class ChildClass extends MyClass { const MY_CONST = "bar"; } $x = new ChildClass(); // prints 'bar' $y = new MyClass(); // prints 'yonder' ?> But $c::MY_CONST is only recognized in version 5.3.0 or later. The class I'm writing may be distributed a lot. Basically, I have defined a constant in ChildClass and one of the functions in MyClass (father class) needs to use the constant. Any idea?

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  • How can I get the behavior of GNU's readlink -f on a Mac?

    - by troelskn
    On Linux, the readlink utility accepts an option -f that follows additional links. This doesn't seem to work on Mac and possibly BSD based systems. What would the equivalent be? Here's some debug information: $ which readlink; readlink -f /usr/bin/readlink readlink: illegal option -f usage: readlink [-n] [file ...]

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  • Django Project Done and Working. Now What?

    - by Rodrogo
    Hi, I just finished what I would call a small django project and pretty soon it's going live. It's only 6 models but a fairly complex view layer and a lot of records saving and retrieving. Of course, forgetting the obvious huge amount of bugs that will, probably, fill my inbox to the top, what would it be the next step towards a website with best performance. What could be tweaked? I'm using jmeter a lot recently and feel confident that I have a good baseline for future performance comparisons, but the thing is: I'm not sure what is the best start, since I'm a greedy bastard that wants to work the least possible and gather the best results. For instance, should I try an approach towards infrastructure, like a distributed database, or should I go with the code itself and in that case, is there something that specifically results in better performance? In your experience, whats pays off more? Personal anecdotes are welcome, but some fact based opinions are even more. :) Thanks very much.

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  • [Drupal] SQL error reporting by mail

    - by Paul
    I was wondering if its possible to have some kind of SQL error reporting that sends me an email that includes the error and the website that it's been found on. I'd like to take this precaution because of hosting multiple drupal systems. There is a PHP error variant: http://drupal.org/project/php_errors Hope you guys know a way to become aware of any possible SQL errors by not loggin in to check the error report.

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  • Getting all rows from a Table where the column contains only 0

    - by Auro
    I got a little problem i need a sql query that gives all rows back that only contains 0 in it. the column is defined as varchar2(6) the values in the column looks like this: 0 00 00 100 bc00 000000 00000 my first solution would be like this: Oracle: substr('000000' || COLUMN_NAME, -6) = '000000' SQL Server: right('000000' + COLUMN_NAME, 6) = '000000' is there an other way? (it needs to work on both systems)

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  • Java 1.7ea: Files.probeContentType(path) returns null

    - by Cybertizzen
    Hi, I'm having a bit of a strange problem with an application using the Files.probeContentType(path)-method to test for file type: On both my Ubuntu and Fedora systems, it works fine, but when moved to a RedHat Enterprise server (2.6.18-194.el5 #1 x86_64 x86_64 x86_64 GNU/Linux), it only returns null. I'm using java 7 early access (1.7.0-ea-b84). I have to use this version due to functionality that isn't included in 1.6. Does anyone have an idea of what might be the problem here?

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  • What you would learn. [closed]

    - by NDeveloper
    Hi, I have a little free time and would like to learn new development language/technology. I know it can be very subective, but please share with us what you would learn and why. I have about 4 years of .NET development experience mostly distributed applications. And a little more than 2 years of c/c++. There are a lot of options to choose like Google Go/F#/Python/Scala/Java/ASP.NET/Mobile App development like for Android, BB, iPhone.../DB (MS SQL, Oracle or even MongoDB or CouchDB)/any new concepts, etc... I would like to use the time for investment, so gained knowledge will be useful.

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