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• Licencing: release the same software with double licence

  - by Luca

  In my free time, I develop (alone, sigh) a project, in particoular an application library. I've released it using GPL v3. At this time, this project has come very useful for a job. I'd like to release my OSS library toghether with the application using the same GPL v3 licence, with the exception that it can be linked for the specific application, or for the specific application vendor. AFAIK, the copyright owner can handle the entire source and licencing it, I did it; and probably the licence owner could cut&paste its own code, change its licence and use for other projects, isn't? But an GPL'ed library cannot be linked with a proprietary software, right? But software could be double-licenced, as MySQL does. So the question is: what should I do to allow the distribution of my GPL'ed library with a proprietary software, being the copyright owner?

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• Read nested Lua table who key is a System.Double

  - by Robert Kerr

  Using C# and LuaInterface, I am trying to read a nested table, but am getting a null LuaTable when I try to open the key containing the table. The .lua file: DB = { ["inventory"] = { [10001] = { ["row"] = 140, ["count"] = 20, }, [10021] = { ["row"] = 83, ["count"] = 3, }, [10075] = { ["row"] = 927, ["count"] = 15, }, } } I can successfully foreach the entries under inventory, by opening that table with: LuaTable tbl = lua.GetTable("DB.inventory"); foreach (DictionaryEntry de in tbl) ... What I cannot do is open an inventory item and enumerate its entries the same way. Is this because the key is a System.Double type? This fails: LuaTable tbl = lua.GetTable("DB.inventory.10001"); foreach (DictionaryEntry de in tbl) with an exception, because tbl is null. Effectively, once I enumerate the keys (inventory items), I then want to drill down into the nested table and work with those contents. As you can see, I am not able to get a reference to the nested table the way I am doing it.

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• Convert Double to String without precision loss in javascript

  - by holger

  I would like to convert a floating point variable to a string without losing any precision. I.e. I would like the string to have the same information as my floating point variable contains, since I use the output for further processing (even if it means that the string will be very long and readable). To put this more clearly, I would like to have functions for cyclic conversion var dA = 323423.23423423e4; var sA = toString(dA); var dnA = toDouble(sA); and I would like dnA and dA to be equal Thanks PS: Sources on the internet usually talk about how to round strings but I have not found information on exact representation. Also I am not interested in Arbitrary Precision calculations, I just need double precision floating point arithmetic.

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• Is it safe to lock a static variable in a non-static class?

  - by Dario Solera

  I've got a class that manages a shared resource. Now, since access to the resource depends on many parameters, this class is instantiated and disposed several times during the normal execution of the program. The shared resource does not support concurrency, so some kind of locking is needed. The first thing that came into my mind is having a static instance in the class, and acquire locks on it, like this: // This thing is static! static readonly object MyLock = new object(); // This thing is NOT static! MyResource _resource = ...; public DoSomeWork() { lock(MyLock) { _resource.Access(); } } Does that make sense, or would you use another approach?

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• ZooKeeper and RabbitMQ/Qpid together - overkill or a good combination?

  - by Chris Sears

  Greetings, I'm evaluating some components for a multi-data center distributed system. We're going to be using message queues (via either RabbitMQ or Qpid) so agents can make asynchronous requests to other agents without worrying about addressing, routing, load balancing or retransmission. In many cases, the agents will be interacting with components that were not designed for highly concurrent access, so locking and cross-agent coordination will be needed to avoid race conditions. Also, we'd like the system to automatically respond to agent or data center failures. With the above use cases in mind, ZooKeeper seemed like it might be a good fit. But I'm wondering if trying to use both ZK and message queuing is overkill. It seems like what Zookeeper does could be accomplished by my own cluster manager using AMQP messaging, but that would be hard to get really right. On the other hand, I've seen some examples where ZooKeeper was used to implement message queuing, but I think RabbitMQ/Qpid are a more natural fit for that. Has anyone out there used a combination like this? Thanks in advance, -Chris

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• Are we asking too much of transactional memory?

  - by Carl Seleborg

  I've been reading up a lot about transactional memory lately. There is a bit of hype around TM, so a lot of people are enthusiastic about it, and it does provide solutions for painful problems with locking, but you regularly also see complaints: You can't do I/O You have to write your atomic sections so they can run several times (be careful with your local variables!) Software transactional memory offers poor performance [Insert your pet peeve here] I understand these concerns: more often than not, you find articles about STMs that only run on some particular hardware that supports some really nifty atomic operation (like LL/SC), or it has to be supported by some imaginary compiler, or it requires that all accesses to memory be transactional, it introduces type constraints monad-style, etc. And above all: these are real problems. This has lead me to ask myself: what speaks against local use of transactional memory as a replacement for locks? Would this already bring enough value, or must transactional memory be used all over the place if used at all?

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• TinyMCE: Double forecolor and backcolor buttons?

  - by petsson

  I'm having a problem using TinyMCE. In IE8, the forecolor and backcolor, for some random reason, is displayed twice. See picture below. Source code (I add the forecolor and backcolor in theme_advanced_buttons2): tinyMCE.init({ mode : "exact", elements : "<%= editArea.ClientID %>", custom_shortcuts : false, language : "en", relative_urls : false, convert_urls : false, forced_root_block : false, force_p_newlines : true, force_br_newlines : false, fix_nesting : true, plugins : "pagebreak,table", pagebreak_separator : '<div style="page-break-after:always;"></div>', theme : "advanced", skin : "o2k7", skin_variant : "blue", width : "540", height : "470", theme_advanced_toolbar_location : "top", theme_advanced_statusbar_location : "none", theme_advanced_font_sizes : "1,2,3,4,5,6,7", font_size_style_values : "0.6em,0.8em,1em,1.2em,1.5em,2em,3em", theme_advanced_buttons1 : "newdocument,|,copy,cut,paste,|,hr,pagebreak,|,undo,redo,|,code|,image,code", theme_advanced_buttons2 : "fontselect,fontsizeselect,|,bold,italic,underline,strikethrough,|,justifyleft,justifycenter,justifyright,justifyfull,|,forecolor,backcolor", // <-- This gives me double forecolor and backcolor theme_advanced_buttons3 : "table,|,row_props,cell_props,|,col_before,col_after,row_before,row_after,|,split_cells,merge_cells,|,delete_col,delete_row," });

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• how to convert string to double with proper cultureinfo

  - by Vinay Pandey

  Hi All, I have two nvarchar fields in database to store the DataType and DefaultValue, I have a DataType Double and value as 65.89875 in english format. Now I want the user to see the value as per the selected browser language format (65.89875 in English should be displayed as 65,89875 in german). Now if the user edits from german format to 65,89875 which is 65.89875 equivalent in english, and the other user views from english browser it comes as 6589875. This happens because in DB it was stored as 65,89875 and when converted using english culture it becomes 6589875 since it considers , as seperator. Any Idea how I get this working for all the browsers?

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• How do I use modulus for float/double?

  - by ShrimpCrackers

  I'm creating an RPN calculator for a school project. I'm having trouble with the modulus operator. Since we're using the double data type, modulus won't work on floating point numbers. For example, 0.5 % 0.3 should return 0.2 but I'm getting a division by zero exception. The instruction says to use fmod(). I've looked everywhere for fmod(), including javadocs but I can't find it. I'm starting to think it's a method I'm going to have to create? edit: hmm, strange. I just plugged in those numbers again and it seems to be working fine...but just in case. Do I need to watch out using the mod operator in Java when using floating types? I know something like this can't be done in C++ (I think).

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• Perl: parsing string enclosed by double quotes

  - by sfactor

  I need to parse tab/space delimited files that have a lot of columns in Perl. The values are such that the there are large strings enclosed within double quotes. These strings can have any characters such as tabs and spaces or anything else. When I try to parse them with the split function it splits these strings as well. Now how can I make perl understand that the strings within the " " are a single column entry? A simple example is, 12 345546.67677 "Hello World!!!" -567.55656 0.5465767 "Hello_Again; "

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• Problem with double quotes and Input

  - by Axel

  Hi, i have the following code : <input type="text" value="<?php echo $_GET['msg']; ?>"> This input is automatically filled with the name that is writen in the previous page. So, if the user wrote : i like "apples" and banana The input will be broken because it will close the tag after the double quotes. I know i can avoid that by html entiting the value, but i don't want this, is there another solution or is there an <<< EOD in html ? Thanks

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• Double Negation in C++ code.

  - by Brian Gianforcaro

  I just came onto a project with a pretty huge code base. I'm mostly dealing with C++ and a lot of the code they write uses double negation for their boolean logic. if (!!variable && (!!api.lookup("some-string"))) { do_some_stuff(); } I know these guys are intelligent programmers, it's obvious they aren't doing this by accident. I'm no seasoned C++ expert, my only guess at why they are doing this is that they want to make absolutely positive that the value being evaluated is the actual boolean representation. So they negate it, then negate that again to get it back to its actual boolean value. Is this a correct? or am I missing something else? Thanks, Brian Gianforcaro

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• Must all Concurrent Data Store (CDB) locks be explicitly released when closing a Berkeley DB?

  - by Steve Emmerson

  I have an application that comprises multiple processes each accessing a single Berkeley DB Concurrent Data Store (CDB) database. Each process is single-threaded and does no explicit locking of the database. When each process terminates normally, it calls DB-close() and DB_ENV-close(). When all processes have terminated, there should be no locks on the database. Episodically, however, the database behaves as if some process was holding a write-lock on it even though all processes have terminated normally. Does each process need to explicitly release all locks before calling DB_ENV-close()? If so, how does the process obtain the "locker" parameter for the call to DB_ENV-loc_vec()?

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• regex jquery remove all double spaces

  - by michael

  Hi I have this code, I want it to remove all the double spaces from a text area, but it will only remove the first occurrence each time. $(document).ready(function(){ $("#article").blur(function(){ ///alert($(this).val()); $(this).val($(this).val().replace(/\s\s+/, ' ')); }); }); I've also tried removeAll(), but it won't work at all. any help would be great, thanks. I have a live example online at http://jsbin.com/ogasu/2/edit

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• [Single|Double|Or no] Quotes when using grep?

  - by Hamy

  Grep acts differently depending on what kind of quotes I surround the regex with. I can't seem to get a clear understanding of why this is. Here is an example of the problem: hamiltont$ grep -e show\( test.txt variable.show(); variable.show(a); variable.show(abc, 132); variableshow(); hamiltont$ grep -e "show\(" test.txt grep: Unmatched ( or \( hamiltont$ grep -e 'show\(' test.txt grep: Unmatched ( or \( I am just assuming there is some proper way to enclose the regex with single/double quotes. Any help? FWIW, grep --version returns grep (GNU grep) 2.5.1

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• double slash apache configuration

  - by VP

  Hi, i'm deploying a ror application and now i have to rewrite the url (in apache) to add a prefix www to the url add / to the end of the url So i took the following approach: RewriteCond %{REQUEST_URI} ^/[^\.]+[^/]$ RewriteRule ^(.*)$ http://%{HTTP_HOST}/$1/ [R=301,L] RewriteCond %{HTTP_HOST} ^foo\.com RewriteRule ^(.*)$ http://www.foo.com/$1 [R=301,L] The problem is that it is appending two trailing slash to my url So for example a resource /question/ask are becoming: http://foo.com//question/ask I tried to add the following Rule before all my Rewrite rules to try to remove the double //: RewriteCond %{REQUEST_URI} ^// RewriteRule ([^/]*)/+(.*) http://www.foo.com/$1/$2 [R=301,L] but it didnt work.. any idea to rip off all extras "//" added to the url?

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• What can cause a double page request?

  - by johnnietheblack

  I am currently investigating a double request problem on my site. Not all the time, but sometimes, a requested page will in fact load twice...which is not a problem really until it is on a page with PHP that inserts stuff into my db on request (my tracking script). I have read that an empty src in an image tag, and an empty url() in a css background could potentially cause the page to be requested twice. However, I can't find any problems with those. Is there anything else that could be causing something like this?

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• Splitting a double vector into equal parts

  - by Cosmin

  Greetings, Any input on a way to divide a std::vector into two equal parts ? I need to find the smallest possible difference between |part1 - part2|. This is how I'm doing it now, but from what you can probably tell it will yield a non-optimal split in some cases. auto mid = std::find_if(prim, ultim, [&](double temp) -> bool { if(tempsum >= sum) return true; tempsum += temp; sum -= temp; return false; }); The vector is sorted, highest to lowest, values can indeed appear twice. I'm not expecting part1 and part2 to have the same numbers of elements, but sum(part1) should be as close as possible to sum(part2) For example if we would have { 2.4, 0.12, 1.26, 0.51, 0.70 }, the best split would be { 2.4, 0.12 } and { 1.26, 0.51, 0.70 }. If it helps, I'm trying to achieve the splitting algorithm for the Shannon Fano encoding. Any input is appreciated, thanks!

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• double fork using vfork

  - by Oren S

  HI I am writing a part of a server which should dispatch some other child processes. Because I want to wait on some of the processes, and dispatch others without waiting for completion, I use double fork for the second kind of processes (thus avoiding the zombie processes). Problem is, my server holds a lot of memory, so forking takes a long time (even the copy-on-write fork used in Linux which copies only the paging tables) I want to replace the fork() with vfork(), and it's easy for the second fork (as it only calls execve() in the child), but I couldn't find any way I can replace the first one. Does anyone know how I can do that? Thanks! The server is a linux (RH5U4), written in C++.

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• How can two threads access a common array of buffers with minimal blocking ? (c#)

  - by Jelly Amma

  Hello, I'm working on an image processing application where I have two threads on top of my main thread: 1 - CameraThread that captures images from the webcam and writes them into a buffer 2 - ImageProcessingThread that takes the latest image from that buffer for filtering. The reason why this is multithreaded is because speed is critical and I need to have CameraThread to keep grabbing pictures and making the latest capture ready to pick up by ImageProcessingThread while it's still processing the previous image. My problem is about finding a fast and thread-safe way to access that common buffer and I've figured that, ideally, it should be a triple buffer (image[3]) so that if ImageProcessingThread is slow, then CameraThread can keep on writing on the two other images and vice versa. What sort of locking mechanism would be the most appropriate for this to be thread-safe ? I looked at the lock statement but it seems like it would make a thread block-waiting for another one to be finished and that would be against the point of triple buffering. Thanks in advance for any idea or advice. J.

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• hibernate versioning parent entity

  - by Priit

  Consider two entities Parent and Child. Child is part of Parent's transient collection Child has a ManyToOne mapping to parent with FetchType.LAZY Both are displayed on the same form to a user. When user saves the data we first update Parent instance and then Child collection (both using merge). Now comes the tricky part. When user modifies only Child property on the form then hibernate dirty checking does not update Parent instance and thus does not increase optimistic locking version number for that entity. I would like to see situation where only Parent is versioned and every time I call merge for Parent then version is always updated even if actual update is not executed in db.

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• What is Ruby's double-colon (::) all about?

  - by Meltemi

  I'd probably be able to answer this for myself if "::" wasn't so hard to Google. Didn't see anything on SO so thought I'd try my luck. What is this double-colon :: all about? I see it everywhere in Rails: class User < ActiveRecord::Base or… ActionController::Routing::Routes.draw do |map| I found a definition from this guy: The :: is a unary operator that allows: constants, instance methods and class methods defined within a class or module, to be accessed from anywhere outside the class or module. but that just leads to more questions. What good is scope (private, protected) if you can just use :: to expose anything?

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• Making a Mac double-clickable application in NetBeans

  - by skiaddict1

  I have recently moved to a MacBook Pro, which has meant leaving my beloved JBuilder 2005 behind. Since there is no such thing any more (AFAIK) as a free JBuilder, I'm having to choose a new IDE. I can't live with the code-formatting of Eclipse (yes, I know, it can be customised up the wazoo, but the fact that it will NOT respect my inserted returns means I can't live with it) so I'm seriously considering NetBeans. However, I can't find any way of getting it to build a double-clickable Mac application! (I used to use XCode for this step, but it seems that XCode no longer wants to know about Java...) I cannot be the first person who's wanted to do this...can anyone help me with advice as to how to go about it? Grateful thanks in advance

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• C++ -malign-double compiler flag

  - by Martin

  I need some help on compiler flags in c++. I'm using a library that is a port to linux from windows, that has to be compiled with the -malign-double flag, "for Win32 compatibility". It's my understanding that this mean I absolutely have to compile my own code with this flag as well? How about other .so shared libraries, do they have be recompiled with this flag as well? If so, is there any way around this? I'm a linux newbie (and c++), so even though I tried to recompile all the libraries I'm using for my project, it was just too complicated to recursively find the source for all the libraries and the libraries they're dependent on, and recompile everything.

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• IIS Active Directory double handshake hickup

  - by AngryHacker

  I have a .net 2.0 click-once application that connects to IIS web services on Windows 2003 R2 64-bits. The IIS is setup with Integrated Windows Authentication. So whenever a web service call is made to IIS web services, there is a double handshake taking place: Client Request #1 GetEmployeeList Server Response #1 <- 401 HTTP/1.1 401 Unauthorized WWW-Authenticate: Negotiate WWW-Authenticate: NTLM Client Request #2 REQUEST Header... Server Response #2 <- 200 Data Received Lately, however, Server Response #1 will sometimes (a good 20 percent of the calls) take a massive amount of time (like 25 to 30 seconds). How do I debug this problem? Is this a Active Directory problem or a Domain Controller problem?

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