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• Is Stopwatch really broken?

  - by Jakub Šturc

  At MSDN page for Stopwatch class I discovered link to interesting article which makes following statement about Stopwatch: However there are some serious issues: This can be unreliable on a PC with multiple processors. Due to a bug in the BIOS, Start() and Stop() must be executed on the same processor to get a correct result. This is unreliable on processors that do not have a constant clock speed (most processors can reduce the clock speed to conserve energy). This is explained in detail here. I am little confused. I've seen tons of examples of using Stopwatch and nobody mention this drawbacks. How serious is this? Should I avoid using Stopwatch?

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• Cleaning strings in R: add punctuation w/o overwriting last character

  - by spearmint

  I'm new to R and unable to find other threads with a similar issue. I'm cleaning data that requires punctuation at the end of each line. I am unable to add, say, a period without overwriting the final character of the line preceding the carriage return + line feed. Sample code: Data1 <- "%trn: dads sheep\r\n*MOT: hunn.\r\n%trn: yes.\r\n*MOT: ana mu\r\n%trn: where is it?" Data2 <- gsub("[^[:punct:]]\r\n\\*", ".\r\n\\*", Data1) The contents of Data2: [1] "%trn: dads shee.\r\n*MOT: hunn.\r\n%trn: yes.\r\n*MOT: ana mu\r\n%trn: where is it?" Notice the "p" of sheep was overwritten with the period. Any thoughts on how I could avoid this?

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• C++: Everytime I read in by fstream I got 1 extra character at the end

  - by Harry Pham

  Everytime I read in by fstream I got 1 extra character at the end, How can I avoid this? EDIT: ifstream readfile(inputFile); ofstream writefile(outputFile); char c; while(!readfile.eof()){ readfile >> c; //c = shiftChar(c, RIGHT, shift); writefile << c; } readfile.close(); writefile.close();

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• Generate links for routes with non-parameter url segments on ASP.NET MVC 2

  - by spapaseit

  I have a route defined with several hardcoded (non-parameter) segments: routes.MapRoute(null, "suggestion/list/by/{tag}", new { controller = "Suggestion", action = "List", tag = UrlParameter.Optional }); Suppose I'm in the Index view of SuggestionController, which has a Suggestion object for Model, how can I create a link that matches that route? I'd rather use one of the provided helpers and keep the route name as null in order to avoid hard-coding to much on my views, but I can't figure out how to user these non-parameter segments in Html.ActionLink or RouteLink methods. I've even tried to render the link using plain ol' html <a href="/suggestion/list/by/<%=Model.Tag %>"><%=Model.Tag %></a> but this somehow didn't match the route either. There's probably a very simple solution and I might be over-complicating things in mi mind, but I'm at a loss. Any ideas? Thanks in advance.

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• How would you make a blog with a TDD approach?

  - by Earlz

  I'm considering remaking my blog(currently in PHP, but <100 lines of non-layout code) in Ruby on Rails just for the fun of it. I want to make another project in Rails, but I should learn Rails(more than hello world) before I go to try to create a full project. Another thing I want to do while remaking my blog is to at least figure out what TDD is all about. So how would you go about taking a Test Driven approach to the creation of a blog? What tests would you write? How would you begin? Everytime I visualize writing a blog it'd end up needing a million tests for a single component to fully test it. How do I avoid writing too many tests? Also, I am making this community wiki because I intend for this to basically be made into a mini tutorial/knowledge base...

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• Lazy loading in Hibernate

  - by Steve

  My Java Web application uses Hibernate to perform ORM. In some of my objects, I use lazy loading to avoid getting data until I absolutely need it. The problem is that I load the initial object in a session, and then that session is destroyed. When I later attempt to resolve the lazy-loaded collections in my object I get the following error: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: common.model.impl.User.groups, no session or session was closed I tried associating a new session with the collection and then resolving, but this gives the same results. Does anyone know how I can resolve the lazy collections once the original session is gone? Thanks... --Steve

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• Extending Object in Javasript

  - by smsteel

  I'm trying to extend Object functionality this way: Object.prototype.get_type = function() { if(this.constructor) { var r = /\W*function\s+([\w\$]+)\(/; var match = r.exec(this.constructor.toString()); return match ? match[1].toLowerCase() : undefined; } else { return typeof this; } } It's great, but there is a problem: var foo = { 'bar' : 'eggs' }; for(var key in foo) { alert(key); } There'll be 3 passages of cycle. Is there any way to avoid this?

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• Windows 32 or 64 bit using HKEY_LOCAL_MACHINE\Software\WOW6432 Node

  - by JimDel

  I'm looking for a very simple way of determining if the version of Windows the customer is using is 32bit or 64bit. I know there are ways using .NEt but I'm looking to avoid them. I simply want to use something similar the below pseudo code and want to know if this method can be reliable. If Registry Key exists (HKEY_LOCAL_MACHINE\Software\WOW6432Node) Then Assume 64bit else Assume 32bit Thanks! EDIT: To be more specific, I know there a several different ways to accomplish the goal of finding out if the OS is 32 or 64bit. But I want to know if the above alone method would be reliable.

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• How to force asp.net MVC 2 to redirect to default controller/action

  - by Chris

  In a brand new ASP.NET MVC2 project, I want the user to be redirected to http://<mysite>/home/index rather than http://<mysite>/ We do this with our other sites for tracking purposes, to avoid the scenario where hits to the same default page show up as http://<mysite>/ http://<mysite>/default.aspx How do I accomplish this so that http://<mysite>/ automatically redirects to whatever default controller/action I have set up in my routing? Please note that I am aware the two are functionally equivalent, as the default controller action will be executed either way. I'm just interested in forcing consistent URLs in the browser.

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• How to configure MySQL connection properties with Spring, Hibernate 3.3 and c3p0?

  - by sfussenegger

  I am currently in the process of upgrading an application from Hibernate 3.2 to Hibernate 3.3. I though I'd stick with the default connection pool (Hibernate changed its default from Commons DBCP to c3p0) as I don't have any good reason to choose a non-default pool. At least non but having used DBCP before. The upgrade went pretty much without any problems so far. The only thing I can't get to work is passing properties to the underlying MySQL JDBC4Connection. Up to now, I used DBCP's BasicDataSource.addConnectionProperty(String,String) to pass properties (useUnicode=true, characterEncodin=UTF-8, characterSetResults=UTF-8, zeroDateTimeBehavior=convertToNull). However, I can't find any way to do the same with c3p0 other than including them in the JDBC URL. (That's something I'd like to avoid as I wanna keep the URL configurable without forcing users to include those parameters.) So far, I've tried to use a ConnectionCustomizer without success. Any other suggestions?

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• cscript - print output on same line on console?

  - by Guy

  If I have a cscript that outputs lines tothe screen, how do I avoid the "line feed" after each print? Example: for a = 1 to 10 print "." REM (do something) next The expected output should be: .......... Not: . . . . . . . . . . In the past I've used to print the "up arrow character" ASCII code. Can this be done in cscript?

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• linux thread synchronization

  - by johnnycrash

  I am new to linux and linux threads. I have spent some time googling to try to understand the differences between all the functions available for thread synchronization. I still have some questions. I have found all of these different types of synchronizations, each with a number of functions for locking, unlocking, testing the lock, etc. gcc atomic operations futexes mutexes spinlocks seqlocks rculocks conditions semaphores My current (but probably flawed) understanding is this: semaphores are process wide, involve the filesystem (virtually I assume), and are probably the slowest. Futexes might be the base locking mechanism used by mutexes, spinlocks, seqlocks, and rculocks. Futexes might be faster than the locking mechanisms that are based on them. Spinlocks dont block and thus avoid context swtiches. However they avoid the context switch at the expense of consuming all the cycles on a CPU until the lock is released (spinning). They should only should be used on multi processor systems for obvious reasons. Never sleep in a spinlock. The seq lock just tells you when you finished your work if a writer changed the data the work was based on. You have to go back and repeat the work in this case. Atomic operations are the fastest synch call, and probably are used in all the above locking mechanisms. You do not want to use atomic operations on all the fields in your shared data. You want to use a lock (mutex, futex, spin, seq, rcu) or a single atomic opertation on a lock flag when you are accessing multiple data fields. My questions go like this: Am I right so far with my assumptions? Does anyone know the cpu cycle cost of the various options? I am adding parallelism to the app so we can get better wall time response at the expense of running fewer app instances per box. Performances is the utmost consideration. I don't want to consume cpu with context switching, spinning, or lots of extra cpu cycles to read and write shared memory. I am absolutely concerned with number of cpu cycles consumed. Which (if any) of the locks prevent interruption of a thread by the scheduler or interrupt...or am I just an idiot and all synchonization mechanisms do this. What kinds of interruption are prevented? Can I block all threads or threads just on the locking thread's CPU? This question stems from my fear of interrupting a thread holding a lock for a very commonly used function. I expect that the scheduler might schedule any number of other workers who will likely run into this function and then block because it was locked. A lot of context switching would be wasted until the thread with the lock gets rescheduled and finishes. I can re-write this function to minimize lock time, but still it is so commonly called I would like to use a lock that prevents interruption...across all processors. I am writing user code...so I get software interrupts, not hardware ones...right? I should stay away from any functions (spin/seq locks) that have the word "irq" in them. Which locks are for writing kernel or driver code and which are meant for user mode? Does anyone think using an atomic operation to have multiple threads move through a linked list is nuts? I am thinking to atomicly change the current item pointer to the next item in the list. If the attempt works, then the thread can safely use the data the current item pointed to before it was moved. Other threads would now be moved along the list. futexes? Any reason to use them instead of mutexes? Is there a better way than using a condition to sleep a thread when there is no work? When using gcc atomic ops, specifically the test_and_set, can I get a performance increase by doing a non atomic test first and then using test_and_set to confirm? *I know this will be case specific, so here is the case. There is a large collection of work items, say thousands. Each work item has a flag that is initialized to 0. When a thread has exclusive access to the work item, the flag will be one. There will be lots of worker threads. Any time a thread is looking for work, they can non atomicly test for 1. If they read a 1, we know for certain that the work is unavailable. If they read a zero, they need to perform the atomic test_and_set to confirm. So if the atomic test_and_set is 500 cpu cycles because it is disabling pipelining, causes cpu's to communicate and L2 caches to flush/fill .... and a simple test is 1 cycle .... then as long as I had a better ratio of 500 to 1 when it came to stumbling upon already completed work items....this would be a win.* I hope to use mutexes or spinlocks to sparilngly protect sections of code that I want only one thread on the SYSTEM (not jsut the CPU) to access at a time. I hope to sparingly use gcc atomic ops to select work and minimize use of mutexes and spinlocks. For instance: a flag in a work item can be checked to see if a thread has worked it (0=no, 1=yes or in progress). A simple test_and_set tells the thread if it has work or needs to move on. I hope to use conditions to wake up threads when there is work. Thanks!

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• Ivy: Publishing all artefacts in a directory

  - by Dave Flowers

  I'm looking to move to Apache Ivy for dependency management on one of our existing projects. The project publishes many artefacts, and the artefacts it produces are likely to change in the future, so I don't want to enumerate all of the publications in the ivy.xml file -- I'd like Ivy to just publish all the files in a given directory. I considered auto-generating a list of the files built and using XSLT to insert it into the ivy.xml, but that seems a little cumbersome for what I'd expect to be a reasonably common requirement. Is there a better way to do this? Can Ivy pick up all the files in a directory and ignore the publications in the Ivy file? Or is there some way to get Ivy to use different files for publication and for fetching, so I can avoid having to use XSLT to merge the files.

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• Bitbanging a PIO on Coldfire/ucLinux

  - by G Forty

  Here's the problem: I need to program some hardware via 2 pins of the PIO (1 clock, 1 data). Timing constraints are tight - 10ms clock cycle time. All this, of course, whilst I maintain very high level services (CAN bus, TCP/IP). The downstream unit also ACKS by asserting a PIO pin, configured as an input, high. So this loop has to both read and write. I need to send 16 bits in the serial stream. Is there an established way to do this sort of thing or should I simply get the hardware guys to add a PIC or somesuch. I'd much prefer to avoid exotics like RTAI extensions at this stage. I did once see a reference to user-mode IO which implied a possible interrupt driven driver but lost track of it. Any pointers welcomed.

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• Alternatives to javascript function-based iteration (e.g. jQuery.each())

  - by Colin

  I've been watching Google Tech Talks' Speed Up Your Javascript and in talking about loops, the speaker mentions to stay away from function-based iterations such as jQuery.each() (among others, at about 24:05 in the video). He briefly explains why to avoid them which makes sense, but admittedly I don't quite understand what an alternative would be. Say, in the case I want to iterate through a column of table cells and use the value to manipulate the adjacent cell's value (just a quick example). Can anyone explain and give an example of an alternative to function-based iteration?

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• Pointer to auto_ptr instead of a classical double pointer

  - by Pin

  Hello. I'm quite new to smart pointers and was trying to refactor some existing code to use auto_ptr. The question I have is about double pointers and their auto_ptr equivalent, if that makes sense. I have a function that accepts a double pointer as its parameter and the function allocates resources for it: void foo ( Image** img ) { ... *img = new Image(); ...} This function is then used like this: Image* img = NULL; foo ( &img ); ... delete img; I want to use auto_ptr to avoid having to call delete explicitly. Is the following correct? void foo ( auto_ptr<Image>* img ); and then auto_ptr<Image> img = NULL; foo ( &img ); Thanks.

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• How to edit localized forms all at one time in Visual Studio

  - by SoMoS

  Hello, I have several forms that are localized to multiple languages. If I do a change on one form (for example, changing the size of a textbox) the change is done only on the localized version of the Form that I have currently selected. Is there a way of extending the change I've done the different localized versions of the same Form to avoid having to go one by one doing the same change by hand? Thanks in advance for your help. EDIT: I'm talking about different forms when the real thign is that you have one form and several resources. The point is that at the end is just like if you have different forms for each locale because the form is built with the data from the resource. The problem is still the same because the edits done on the form are stored at one resource file and I have to put by hand those edits in all the resources.

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• Help with complex sql query

  - by eugeneK

  To make story short, i'm building self-learning banner management system. Users will be able to insert these banners to their site when banners will be shown based on sales/impressions ratio. I have 4 tables Banners bannerID int bannerImage varchar.... SmartBanners smartBannerID int smartBannerArrayID int bannerID int impressionsCount int visibility tinyint (percents) SmartBannerArrays smartBannerArrayID int userID int Statistics bannerID int saleAmountPerDay decimal... Each night i need to generate new "visibility" for each SmartBanner based on whole SmartBannerArray that same user has. So i need to get sum of impressions and sales for each bannerID in SmartBannerArray. All comes to my mind is to use double cursor, one will loop thought SmartBannerArrays get needed values for sum of impressions and sales and then inner loop which will access each SmartBanner and change it's "visibility" percentage based on (sales/impressions)/(sumOfSales/sumOfImpressions)*100 Hope you get the picture... Is there any other way to design better tables or not to use double cursor to avoid server overload ?

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• Unable to make 2 parallel TCP requests to the same TCP Client

  - by soldieraman

  Error: Unable to read data from the transport connection: A blocking operation was interrupted by a call to WSACancelBlockingCall Situation There is a TCP Server My web application connects to this TCP Server Using the below code: TcpClientInfo = new TcpClient(); _result = TcpClientInfo.BeginConnect(<serverAddress>,<portNumber>, null, null); bool success = _result.AsyncWaitHandle.WaitOne(20000, true); if (!success) { TcpClientInfo.Close(); throw new Exception("Connection Timeout: Failed to establish connection."); } NetworkStreamInfo = TcpClientInfo.GetStream(); NetworkStreamInfo.ReadTimeout = 20000; 2 Users use the same application from two different location to access information from this server at the SAME TIME Server takes around 2sec to reply Both Connect But One of the user gets above error "Unable to read data from the transport connection: A blocking operation was interrupted by a call to WSACancelBlockingCall" when trying to read data from stream How can I resolve this issue? Use a better way of connecting to the server Can't because it's a server issue if a server issue, how should the server handle request to avoid this problem

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• Launching Vim via Lua

  - by Keith Pimmel

  I'm writing a simple little Lua commandline app that will build a static website. I'm storing my fragments in a sqlite database. Retrieving the data from the db is straightforward as is saving it; my question comes from editing the data. Is there an elegant way to pipe the data from Lua to vim? Can vim edit a memory buffer and return it? I was planning on launching the editor via os.execute('vim') but only after grabbing a temporary file handle and dumping the database output into that. I would like to have to avoid touching the filesystem that way but that is my contingency plan.

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• Handling Java stdout and stderr in Perl

  - by syker

  I am trying to run a Java program from my Perl script. I would like to avoid using System.exit(1) and System.exit(-1) commands in Java. I am however printing to STDOUT and STDERR from Java. In my Perl script, I am reading from Java's stdout and using that line by line output. How do I print stderr and fail if I ever see stderr? This is what I have so far: my $java_command = ...; open(DATA, ">$java_command"); while (<DATA>) { chomp($_); .... .... }

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• In LaTeX prefer figures on text-heavy pages.

  - by bjarkef

  Hi LaTeX seems to have a preference for placing figures together on a page, and placing surrounding text on a separate page. Can I somehow change that balance a bit, as I prefer figures to break up the text to avoid too black text-heavy pages. Example: \section{Some section} [Half a page of text] \begin{figure} [...] \caption{Figure text 1} \end{figure} [Half a page of text] \begin{figure} [...] \caption{Figure text 2} \end{figure} [More text] So what LaTeX usually does is to stack the two half pages of text on a single page, and the figures on the following page. I believe this really gives a bad balance, and bores the reader. So can I change that somehow? I know about postfixing the \begin{figure} with [ht!], but often it does not really matter. I would like to configure the balancing algorithms in LaTeX to naturally prefer pages with combined figures and text.

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• Saving gzipped string into Sqlite3 via Rails throws unrecognized token error

  - by user141146

  Hi, I'm using rails 2.3 and I'm trying to compress (gzip) text that I'd like to save using ActiveRecord into a sqlite database. However, the compressed text isn't being saved b/c I get this type of error: SQLite3::SQLException: unrecognized token: "'x##U?#7 Any thoughts on what I can do to avoid this error? should I compress the text in some other fashion? should I save the data using some other method(s)? Relevant code is below. # compress my text require 'zlib' defl = Zlib::Deflate test_string = "<h3>some text</h3>some additional text<p>here's some more text</p>" compressed_string = defl.deflate(test_string) => "x\234\263\3110\266+\316\317MU(I\255(\261\321\207\361\022SR2K2\363\363\022s \022\005v\031\251E\251\352\305\n`\331\334\374\"\230\206\002;\000\0225\027\222" ModelClass.new(:attribute1 => compressed_string).save ActiveRecord::StatementInvalid: SQLite3::SQLException: unrecognized token: "'x#####+##MU(I#(#?####2K2#### v#E####

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• How do I adjust overall width of rdlc report when some columns are hidden?

  - by user115487

  I have a customizable rdlc report where the user can choose which columns to show. All the columns are included in the report designer, and I use parameters to hide/show columns based on the user's choice. The report renders correctly, and only shows the selected columns, HOWEVER, the overall width of the report is the same as if all the columns were visible. This means that the report can have a huge empty area to the right of the selected columns, which looks very silly. So my question: Is there a way to adjust the report width dynamically at runtime to avoid a large silly empty area in the report? I attempted to do this in the designer by assigning a parameter to the width of the report body....but that was not allowed. The width cannot be an expression of any kind in the designer, only an actual value is allowed. Any suggestions?

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• Automatically deleting pyc files when corresponding py is moved (Mercurial)

  - by Oddthinking

  (I foresaw this problem might happen 3 months ago, and was told to be diligent to avoid it. Yesterday, I was bitten by it, hard, and now that it has cost me real money, I am keen to fix it.) If I move one of my Python source files into another directory, I need to remember to tell Mercurial that it moved (hg move). When I deploy the new software to my server with Mercurial, it carefully deletes the old Python file and creates it in the new directory. However, Mercurial is unaware of the pyc file in the same directory, and leaves it behind. The old pyc is used preferentially over new python file by other modules in the same directory. What ensues is NOT hilarity. How can I persuade Mercurial to automatically delete my old pyc file when I move the python file? Is there another better practice? Trying to remember to delete the pyc file from all the Mercurial repositories isn't working.

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