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• Benefits of classic OOP over Go-like language

  - by tylerl

  I've been thinking a lot about language design and what elements would be necessary for an "ideal" programming language, and studying Google's Go has led me to question a lot of otherwise common knowledge. Specifically, Go seems to have all of the interesting benefits from object oriented programming without actually having any of the structure of an object oriented language. There are no classes, only structures; there is no class/structure inheritance -- only structure embedding. There aren't any hierarchies, no parent classes, no explicit interface implementations. Instead, type casting rules are based on a loose system similar to duck-typing, such that if a struct implements the necessary elements of a "Reader" or a "Request" or an "Encoding", then you can cast it and use it as one. Does such a system obsolete the concept of OOP? Or is there something about OOP as implemented in C++ and Java and C# that is inherently more capable, more maintainable, somehow more powerful that you have to give up when moving to a language like Go? What benefit do you have to give up to gain the simplicity that this new paradigm represents?

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• What can be done against language inertia?

  - by gerrit

  Often, projects use programming language X, but would use programming language Y if they were started from scratch. For example, big numerical models may be written entirely in Fortran. Whereas this might be a reasonable choice for the components that need to run fast (alternative would be C or C++), it might be a poor choice for components that either do not need to run fast (such as things dealing with human input or simple visualisations), or where runtime is not the limiting factor (such as I/O, particularly when from the network). Another example may be when a project is built using a propriety language (such as Matlab; no, FOSS clones are not good enough) and was started at a time when FOSS alternatives were not viable, but ten years later, they are; and it would be beneficial to migrate. However, due to language inertia, a migration does not happen. Code that works should not be touched, porting code is a time-consuming, expensive process, and programmers are familiar in language X but not necessarily in language Y. Still, in the long term, a migration would likely be beneficial. Can anything be done to mitigate the problems associated with language inertia? Are there any notable examples of big projects that have successfully overcome this problem? Or is a project bound to stick forever with the initial choices?

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• What's the proper term for a function inverse to a constructor? Deconstructor, destructor, or something else?

  - by Petr Pudlák

  Edit: I'm rephrasing the question a bit. Apparently I caused some confusion because I didn't realize that the term destructor is used in OOP for something quite different - it's a function invoked when an object is being destroyed. In functional programming we (try to) avoid mutable state so there is no such equivalent to it. (I added the proper tag to the question.) Instead, I've seen that the record field for unwrapping a value (especially for single-valued data types such as newtypes) is sometimes called destructor or perhaps deconstructor. For example, let's have (in Haskell): newtype Wrap = Wrap { unwrap :: Int } Here Wrap is the constructor and unwrap is what? I've seen both, for example: ... Most often, one supplies smart constructors and destructors for these to ease working with them. ... at Haskell wiki, or ... The general theme here is to fuse constructor - deconstructor pairs like ... at Haskell wikibook (here it's probably meant in a bit more general sense). The questions are: How do we call unwrap in functional programming? Deconstructor? Destructor? Or by some other term? And to clarify, is this terminology applicable to other functional languages, or is it used just in the Has

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• Where to Start?

  - by freemann098

  my name is Chase. I've been programming for over 3 years now and I've made very little progress towards game development. I blame myself for it due to reasons. I have experience in many languages such as C++, C#, and Java. I have a little bit of knowledge in JavaScript/HTML and Python. My question is where to start on actually understanding jumping into game development. Whenever I watch game development tutorials it mostly makes sense until points of things like OpenGL or advanced topics that make no sense at all. An example is something like glOrhho Matrix or whatever. Videos either don't explain things like this or they're not explained very well. Do I not know enough basics? I find myself always copying code from a video but understanding very little of it. It's like i'm memorizing things I don't understand which makes it hard to program at all. If I were to want to get to the point where I could write my own game engine or just a game by myself in general in C++ using at the most documentation how would I start at mastering to that level. Should I learn C first, or get really good at basics in general with C++. I know there is a similar posted question on this site but it's not the same due to the fact the person asking the question has a well knowledge level in programming. I'm stuck in a loop of learning the same things but if I go farther I don't understand. I'm stuck in the same spot and need to make progress.

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• Uses of persistent data structures in non-functional languages

  - by Ray Toal

  Languages that are purely functional or near-purely functional benefit from persistent data structures because they are immutable and fit well with the stateless style of functional programming. But from time to time we see libraries of persistent data structures for (state-based, OOP) languages like Java. A claim often heard in favor of persistent data structures is that because they are immutable, they are thread-safe. However, the reason that persistent data structures are thread-safe is that if one thread were to "add" an element to a persistent collection, the operation returns a new collection like the original but with the element added. Other threads therefore see the original collection. The two collections share a lot of internal state, of course -- that's why these persistent structures are efficient. But since different threads see different states of data, it would seem that persistent data structures are not in themselves sufficient to handle scenarios where one thread makes a change that is visible to other threads. For this, it seems we must use devices such as atoms, references, software transactional memory, or even classic locks and synchronization mechanisms. Why then, is the immutability of PDSs touted as something beneficial for "thread safety"? Are there any real examples where PDSs help in synchronization, or solving concurrency problems? Or are PDSs simply a way to provide a stateless interface to an object in support of a functional programming style?

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• What's the proper term for a function inverse to a constructor - to unwrap a value from a data type?

  - by Petr Pudlák

  Edit: I'm rephrasing the question a bit. Apparently I caused some confusion because I didn't realize that the term destructor is used in OOP for something quite different - it's a function invoked when an object is being destroyed. In functional programming we (try to) avoid mutable state so there is no such equivalent to it. (I added the proper tag to the question.) Instead, I've seen that the record field for unwrapping a value (especially for single-valued data types such as newtypes) is sometimes called destructor or perhaps deconstructor. For example, let's have (in Haskell): newtype Wrap = Wrap { unwrap :: Int } Here Wrap is the constructor and unwrap is what? The questions are: How do we call unwrap in functional programming? Deconstructor? Destructor? Or by some other term? And to clarify, is this/other terminology applicable to other functional languages, or is it used just in the Haskell? Perhaps also, is there any terminology for this in general, in non-functional languages? I've seen both terms, for example: ... Most often, one supplies smart constructors and destructors for these to ease working with them. ... at Haskell wiki, or ... The general theme here is to fuse constructor - deconstructor pairs like ... at Haskell wikibook (here it's probably meant in a bit more general sense), or newtype DList a = DL { unDL :: [a] -> [a] } The unDL function is our deconstructor, which removes the DL constructor. ... in The Real World Haskell.

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• When can you call yourself good at language X?

  - by SoulBeaver

  This goes back to a conversation I've had with my girlfriend. I tried to tell her that I simply don't feel adequate enough in my programming language (C++) to call myself good. She then asked me, "Well, when do you consider yourself good enough?" That's an interesting question. I didn't know what to tell her. So I'm asking you. For any programming language, framework or the like, when do you reach a point were you sit back, look at what you've done and say, "Hey, I'm actually pretty good at this."? How do you define "good" so that you can tell others, honestly, "Yeah, I'm good at X". Additionally, do you reach these conclusions by comparing what others can do? Additional Info I have read the canonical paper on how it takes ten-thousand hours before you are an expert on the field. (Props to anybody that knows what this paper is called again) I have also read various articles from Coding Horror about interviewing people. Some people, it was said, "Cannot function outside of a framework." So they may be "good" for that framework, but not otherwise in the language. Is this true?

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• What are some techniques I can use to refactor Object Oriented code into Functional code?

  - by tieTYT

  I've spent about 20-40 hours developing part of a game using JavaScript and HTML5 canvas. When I started I had no idea what I was doing. So it started as a proof of concept and is coming along nicely now, but it has no automated tests. The game is starting to become complex enough that it could benefit from some automated testing, but it seems tough to do because the code depends on mutating global state. I'd like to refactor the whole thing using Underscore.js, a functional programming library for JavaScript. Part of me thinks I should just start from scratch using a Functional Programming style and testing. But, I think refactoring the imperative code into declarative code might be a better learning experience and a safer way to get to my current state of functionality. Problem is, I know what I want my code to look like in the end, but I don't know how to turn my current code into it. I'm hoping some people here could give me some tips a la the Refactoring book and Working Effectively With Legacy Code. For example, as a first step I'm thinking about "banning" global state. Take every function that uses a global variable and pass it in as a parameter instead. Next step may be to "ban" mutation, and to always return a new object. Any advice would be appreciated. I've never taken OO code and refactored it into Functional code before.

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• What are some ways to separate game logic from animations and the draw loop?

  - by TMV

  I have only previously made flash games, using MovieClips and such to separate out my animations from my game logic. Now I am getting into trying my hand at making a game for Android, but the game programming theory around separating these things still confuses me. I come from a background of developing non game web applications so I am versed in more MVC like patterns and am stuck in that mindset as I approach game programming. I want to do things like abstract my game by having, for example, a game board class that contains the data for a grid of tiles with instances of a tile class that each contain properties. I can give my draw loop access to this and have it draw the game board based on the properties of each tile on the game board, but I don't understand where exactly animation should go. As far as I can tell, animation sort of sits between the abstracted game logic (model) and the draw loop (view). With my MVC mindset, it's frustrating trying to decide where animation is actually supposed to go. It would have quite a bit of data associated with it like a model, but seemingly needs to be very closely coupled with the draw loop in order to have things like frame independent animation. How can I break out of this mindset and start thinking about patterns that make more sense for games?

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• Are specific types still necessary?

  - by MKO

  One thing that occurred to me the other day, are specific types still necessary or a legacy that is holding us back. What I mean is: do we really need short, int, long, bigint etc etc. I understand the reasoning, variables/objects are kept in memory, memory needs to be allocated and therefore we need to know how big a variable can be. But really, shouldn't a modern programming language be able to handle "adaptive types", ie, if something is only ever allocated in the shortint range it uses fewer bytes, and if something is suddenly allocated a very big number the memory is allocated accordinly for that particular instance. Float, real and double's are a bit trickier since the type depends on what precision you need. Strings should however be able to take upp less memory in many instances (in .Net) where mostly ascii is used buth strings always take up double the memory because of unicode encoding. One argument for specific types might be that it's part of the specification, ie for example a variable should not be able to be bigger than a certain value so we set it to shortint. But why not have type constraints instead? It would be much more flexible and powerful to be able to set permissible ranges and values on variables (and properties). I realize the immense problem in revamping the type architecture since it's so tightly integrated with underlying hardware and things like serialization might become tricky indeed. But from a programming perspective it should be great no?

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• How do I daemonify my daemon?

  - by jonobacon

  As part of the Ubuntu Accomplishments system I have a daemon that runs as well as a client that connects to it. The daemon is written in Python (using Twisted) and provides a dbus service and a means of processing requests from the clients. Right now the daemon is just a program I run before I run the client and it sets up the dbus service and provides an API that can be used by the clients. I want to transform this into something that can be installed and run as a system service for the user's session (e.g. starting on boot) and providing a means to start and stop it etc. The problem is, I am not sure what I need to do to properly daemonify it so it can run as this service. I wanted to ask if others can provide some guidance. Some things I need to ask: How can I treat it as a service that is run for the current user service (not a system service right now)? How do I ensure I can start, stop, and restart this session service? When packaging this, how do I ensure that it installs it as a service for the user's session and is started on login etc? In responding, if you can point me to specific examples or solutions I need to implement, that would be helpful. :-) Thanks! Jono

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• Spending a good fortune on a certificate holding Scrum Master or a Veteran XP coach?

  - by ashy_32bit

  There is a very prestigious company that delivers a well-sold software about financial systems. It has more that 20 years of history, and is staffed with about 20 programmers and much larger number of managerial staff. Dissatisfied customers have reported strange bugs and no one has a clue what is wrong, hard to read code, and customization is prohibitively expensive. In a word, the software is rotten. The company decided to spend a fortune and found the Agile thing as the remedy but they are stuck about what it is they need most urgently. Is it about the process or the developers or both? The challenge breaks down to the following options: They can hire a certificate holding Scrum Master to teach them Scrum. When asked about the value of doing it, the SM responded: "I will prepare them to embrace Agile and only then they can go Agile and save the product". They can as well hire a veteran XP coach. When posed with the same question he responded : "The most urgent problem is with the programmers and not the management, XP will save the product from rot and only then Scrum will make sense" Developers are far from capable of doing agile programming practices at the moment. No unit tests, no pair programmings, no CI (huh? what is it?) ... you get the idea. Some say they would be far better trying to improve their programming first (hire option 2) and then go with the process. Many say quite the opposite. Any insights ?

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• Laser range finder, what language to use? Beginner advice

  - by DrOnline

  I hope this is the right place. I am a programming beginner, and I want to make a laser range finder, and I need advice about how to proceed etc. In a few weeks I will get a lot of dirt cheap 3-5V lasers and some cheap usb webcams. I will point the laser and webcam in parallel, and somehow use trigonometry and programming to determined distance. I have seen online that others made done it this way, I have purposefully not looked at the details too much because I want to develop it on my own, and learn, but I know the general outline. I have a general idea of how to proceed. The program loads in a picture from the webcam, and I dunno how images work really, but I imagine there is a format that is basically an array of RGB values.. is this right? I will load in the red values, and find the most red one. I know the height difference between the laser and the cam. I know the center dot in the image, I know the redmost dot. I'm sure there's some way to figure out some range there. TO THE POINT: 1) Is my reasoning sound thus far, especially in terms of image analysis? I don't need complete solutions, just general points 2) What I need to figure out, is what platform to use. I have an arduino... apparently, I've read it's too weak to process images. Read that online. I know some C I know some Python I have Matlab. Which is the best option? I do not need high sampling rates, I have not decided on whether it should be automated or whether I should make a GUI with a button to press for samples. I will keep it simple and expand I think. I also do not need it to be super accurate, I'm just having fun here. Advice!

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• Weird exception in linkbutton in a datalist

  - by user308806

  Dear all, I have written this datalist : <div class="story" runat="server"> <asp:DataList ID="DataList2" runat="server" Height="16px" Width="412px"> <SeparatorTemplate> <hr /> </SeparatorTemplate> <ItemTemplate> <asp:LinkButton ID="LinkButton1" runat ="server" Text='<%# Eval("Name") %>' PostBackUrl='<%#Eval("Url")%>' /> <br /> Description: <asp:Label ID="new" Text='<%#Eval("Description") %>' runat="server" /> </ItemTemplate> </asp:DataList> </div> It raises an exception saying that the linkbutton has to be placed in a tag that contains runat="server" although it exists. Here is the trace [HttpException (0x80004005): Le contrôle 'DataList2_ctl00_LinkButton1' de type 'LinkButton' doit être placé dans une balise form avec runat=server.] System.Web.UI.Page.VerifyRenderingInServerForm(Control control) +8689747 System.Web.UI.WebControls.LinkButton.AddAttributesToRender(HtmlTextWriter writer) +39 System.Web.UI.WebControls.WebControl.RenderBeginTag(HtmlTextWriter writer) +20 System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +20 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19 System.Web.UI.WebControls.WebControl.RenderContents(HtmlTextWriter writer) +10 System.Web.UI.WebControls.DataListItem.RenderItemInternal(HtmlTextWriter writer, Boolean extractRows, Boolean tableLayout) +51 System.Web.UI.WebControls.DataListItem.RenderItem(HtmlTextWriter writer, Boolean extractRows, Boolean tableLayout) +57 System.Web.UI.WebControls.DataList.System.Web.UI.WebControls.IRepeatInfoUser.RenderItem(ListItemType itemType, Int32 repeatIndex, RepeatInfo repeatInfo, HtmlTextWriter writer) +64 System.Web.UI.WebControls.RepeatInfo.RenderVerticalRepeater(HtmlTextWriter writer, IRepeatInfoUser user, Style controlStyle, WebControl baseControl) +262 System.Web.UI.WebControls.RepeatInfo.RenderRepeater(HtmlTextWriter writer, IRepeatInfoUser user, Style controlStyle, WebControl baseControl) +27 System.Web.UI.WebControls.DataList.RenderContents(HtmlTextWriter writer) +208 System.Web.UI.WebControls.BaseDataList.Render(HtmlTextWriter writer) +30 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19 System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +32 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19 System.Web.UI.Page.Render(HtmlTextWriter writer) +29 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1266

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• Instance Failure in asp.net

  - by user85511

  I have a web application that is working perfectly in my system. However, when I copied it to another system, I couldn't login to the application. There is an error: Server Error in '/' Application. -------------------------------------------------------------------------------- Instance failure. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidOperationException: Instance failure. Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace: [InvalidOperationException: Instance failure.] System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject) +4858423 System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64 timerExpire, SqlConnection owningObject) +90 System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart) +257 System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) +221 System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) +189 System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) +4859187 System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) +31 System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) +433 System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) +66 System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +499 System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +65 System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +117 System.Data.SqlClient.SqlConnection.Open() +122 System.Web.DataAccess.SqlConnectionHolder.Open(HttpContext context, Boolean revertImpersonate) +87 System.Web.DataAccess.SqlConnectionHelper.GetConnection(String connectionString, Boolean revertImpersonation) +221 System.Web.Security.SqlMembershipProvider.GetPasswordWithFormat(String username, Boolean updateLastLoginActivityDate, Int32& status, String& password, Int32& passwordFormat, String& passwordSalt, Int32& failedPasswordAttemptCount, Int32& failedPasswordAnswerAttemptCount, Boolean& isApproved, DateTime& lastLoginDate, DateTime& lastActivityDate) +815 System.Web.Security.SqlMembershipProvider.CheckPassword(String username, String password, Boolean updateLastLoginActivityDate, Boolean failIfNotApproved, String& salt, Int32& passwordFormat) +105 System.Web.Security.SqlMembershipProvider.CheckPassword(String username, String password, Boolean updateLastLoginActivityDate, Boolean failIfNotApproved) +42 System.Web.Security.SqlMembershipProvider.ValidateUser(String username, String password) +78 System.Web.UI.WebControls.Login.AuthenticateUsingMembershipProvider(AuthenticateEventArgs e) +60 System.Web.UI.WebControls.Login.OnAuthenticate(AuthenticateEventArgs e) +119 System.Web.UI.WebControls.Login.AttemptLogin() +115 System.Web.UI.WebControls.Login.OnBubbleEvent(Object source, EventArgs e) +101 System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +37 System.Web.UI.WebControls.Button.OnCommand(CommandEventArgs e) +118 System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +166 System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10 System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13 System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565 -------------------------------------------------------------------------------- Version Information: Microsoft .NET Framework Version:2.0.50727.3053; ASP.NET Version:2.0.50727.3053 What could be the reason for such an error? How could I solve this?

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• C#: System.Collections.Concurrent.ConcurrentQueue vs. Queue

  - by James Michael Hare

  I love new toys, so of course when .NET 4.0 came out I felt like the proverbial kid in the candy store!  Now, some people get all excited about the IDE and it’s new features or about changes to WPF and Silver Light and yes, those are all very fine and grand.  But me, I get all excited about things that tend to affect my life on the backside of development.  That’s why when I heard there were going to be concurrent container implementations in the latest version of .NET I was salivating like Pavlov’s dog at the dinner bell. They seem so simple, really, that one could easily overlook them.  Essentially they are implementations of containers (many that mirror the generic collections, others are new) that have either been optimized with very efficient, limited, or no locking but are still completely thread safe -- and I just had to see what kind of an improvement that would translate into. Since part of my job as a solutions architect here where I work is to help design, develop, and maintain the systems that process tons of requests each second, the thought of extremely efficient thread-safe containers was extremely appealing.  Of course, they also rolled out a whole parallel development framework which I won’t get into in this post but will cover bits and pieces of as time goes by. This time, I was mainly curious as to how well these new concurrent containers would perform compared to areas in our code where we manually synchronize them using lock or some other mechanism.  So I set about to run a processing test with a series of producers and consumers that would be either processing a traditional System.Collections.Generic.Queue or a System.Collection.Concurrent.ConcurrentQueue. Now, I wanted to keep the code as common as possible to make sure that the only variance was the container, so I created a test Producer and a test Consumer.  The test Producer takes an Action<string> delegate which is responsible for taking a string and placing it on whichever queue we’re testing in a thread-safe manner: 1: internal class Producer 2: { 3: public int Iterations { get; set; } 4: public Action<string> ProduceDelegate { get; set; } 5: 6: public void Produce() 7: { 8: for (int i = 0; i < Iterations; i++) 9: { 10: ProduceDelegate(“Hello”); 11: } 12: } 13: } Then likewise, I created a consumer that took a Func<string> that would read from whichever queue we’re testing and return either the string if data exists or null if not.  Then, if the item doesn’t exist, it will do a 10 ms wait before testing again.  Once all the producers are done and join the main thread, a flag will be set in each of the consumers to tell them once the queue is empty they can shut down since no other data is coming: 1: internal class Consumer 2: { 3: public Func<string> ConsumeDelegate { get; set; } 4: public bool HaltWhenEmpty { get; set; } 5: 6: public void Consume() 7: { 8: bool processing = true; 9: 10: while (processing) 11: { 12: string result = ConsumeDelegate(); 13: 14: if(result == null) 15: { 16: if (HaltWhenEmpty) 17: { 18: processing = false; 19: } 20: else 21: { 22: Thread.Sleep(TimeSpan.FromMilliseconds(10)); 23: } 24: } 25: else 26: { 27: DoWork(); // do something non-trivial so consumers lag behind a bit 28: } 29: } 30: } 31: } Okay, now that we’ve done that, we can launch threads of varying numbers using lambdas for each different method of production/consumption.  First let's look at the lambdas for a typical System.Collections.Generics.Queue with locking: 1: // lambda for putting to typical Queue with locking... 2: var productionDelegate = s => 3: { 4: lock (_mutex) 5: { 6: _mutexQueue.Enqueue(s); 7: } 8: }; 9:  10: // and lambda for typical getting from Queue with locking... 11: var consumptionDelegate = () => 12: { 13: lock (_mutex) 14: { 15: if (_mutexQueue.Count > 0) 16: { 17: return _mutexQueue.Dequeue(); 18: } 19: } 20: return null; 21: }; Nothing new or interesting here.  Just typical locks on an internal object instance.  Now let's look at using a ConcurrentQueue from the System.Collections.Concurrent library: 1: // lambda for putting to a ConcurrentQueue, notice it needs no locking! 2: var productionDelegate = s => 3: { 4: _concurrentQueue.Enqueue(s); 5: }; 6:  7: // lambda for getting from a ConcurrentQueue, once again, no locking required. 8: var consumptionDelegate = () => 9: { 10: string s; 11: return _concurrentQueue.TryDequeue(out s) ? s : null; 12: }; So I pass each of these lambdas and the number of producer and consumers threads to launch and take a look at the timing results.  Basically I’m timing from the time all threads start and begin producing/consuming to the time that all threads rejoin.  I won't bore you with the test code, basically it just launches code that creates the producers and consumers and launches them in their own threads, then waits for them all to rejoin.  The following are the timings from the start of all threads to the Join() on all threads completing.  The producers create 10,000,000 items evenly between themselves and then when all producers are done they trigger the consumers to stop once the queue is empty. These are the results in milliseconds from the ordinary Queue with locking: 1: Consumers Producers 1 2 3 Time (ms) 2: ---------- ---------- ------ ------ ------ --------- 3: 1 1 4284 5153 4226 4554.33 4: 10 10 4044 3831 5010 4295.00 5: 100 100 5497 5378 5612 5495.67 6: 1000 1000 24234 25409 27160 25601.00 And the following are the results in milliseconds from the ConcurrentQueue with no locking necessary: 1: Consumers Producers 1 2 3 Time (ms) 2: ---------- ---------- ------ ------ ------ --------- 3: 1 1 3647 3643 3718 3669.33 4: 10 10 2311 2136 2142 2196.33 5: 100 100 2480 2416 2190 2362.00 6: 1000 1000 7289 6897 7061 7082.33 Note that even though obviously 2000 threads is quite extreme, the concurrent queue actually scales really well, whereas the traditional queue with simple locking scales much more poorly. I love the new concurrent collections, they look so much simpler without littering your code with the locking logic, and they perform much better.  All in all, a great new toy to add to your arsenal of multi-threaded processing!

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• Unable to use factory girl with Cucumber and rails 3 (bundler problem)

  - by jbpros

  Hi there, I'm trying to run cucumber features with factory girl factories on a fresh Rails 3 application. Here is my Gemfile: source "http://gemcutter.org" gem "rails", "3.0.0.beta" gem "pg" gem "factory_girl", :git => "git://github.com/thoughtbot/factory_girl.git", :branch => "rails3" gem "rspec-rails", ">= 2.0.0.beta.4" gem "capybara" gem "database_cleaner" gem "cucumber-rails", :require => false Then the bundle install commande just runs smoothly: $ bundle install /usr/lib/ruby/gems/1.8/gems/bundler-0.9.3/lib/bundler/installer.rb:81:Warning: Gem::Dependency#version_requirements is deprecated and will be removed on or after August 2010. Use #requirement Updating git://github.com/thoughtbot/factory_girl.git Fetching source index from http://gemcutter.org Resolving dependencies Installing abstract (1.0.0) from system gems Installing actionmailer (3.0.0.beta) from system gems Installing actionpack (3.0.0.beta) from system gems Installing activemodel (3.0.0.beta) from system gems Installing activerecord (3.0.0.beta) from system gems Installing activeresource (3.0.0.beta) from system gems Installing activesupport (3.0.0.beta) from system gems Installing arel (0.2.1) from system gems Installing builder (2.1.2) from system gems Installing bundler (0.9.13) from system gems Installing capybara (0.3.6) from system gems Installing cucumber (0.6.3) from system gems Installing cucumber-rails (0.3.0) from system gems Installing culerity (0.2.9) from system gems Installing database_cleaner (0.5.0) from system gems Installing diff-lcs (1.1.2) from system gems Installing erubis (2.6.5) from system gems Installing factory_girl (1.2.3) from git://github.com/thoughtbot/factory_girl.git (at rails3) Installing ffi (0.6.3) from system gems Installing i18n (0.3.6) from system gems Installing json_pure (1.2.3) from system gems Installing mail (2.1.3) from system gems Installing memcache-client (1.7.8) from system gems Installing mime-types (1.16) from system gems Installing nokogiri (1.4.1) from system gems Installing pg (0.9.0) from system gems Installing polyglot (0.3.0) from system gems Installing rack (1.1.0) from system gems Installing rack-mount (0.4.7) from system gems Installing rack-test (0.5.3) from system gems Installing rails (3.0.0.beta) from system gems Installing railties (3.0.0.beta) from system gems Installing rake (0.8.7) from system gems Installing rspec (2.0.0.beta.4) from system gems Installing rspec-core (2.0.0.beta.4) from system gems Installing rspec-expectations (2.0.0.beta.4) from system gems Installing rspec-mocks (2.0.0.beta.4) from system gems Installing rspec-rails (2.0.0.beta.4) from system gems Installing selenium-webdriver (0.0.17) from system gems Installing term-ansicolor (1.0.5) from system gems Installing text-format (1.0.0) from system gems Installing text-hyphen (1.0.0) from system gems Installing thor (0.13.4) from system gems Installing treetop (1.4.4) from system gems Installing tzinfo (0.3.17) from system gems Installing webrat (0.7.0) from system gems Your bundle is complete! When I run cucumber, here is the error I get: $ rake cucumber (in /home/jbpros/projects/deorbitburn) /usr/lib/ruby/gems/1.8/gems/bundler-0.9.3/lib/bundler/resolver.rb:97:Warning: Gem::Dependency#version_requirements is deprecated and will be removed on or after August 2010. Use #requirement NOTICE: CREATE TABLE will create implicit sequence "posts_id_seq" for serial column "posts.id" NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "posts_pkey" for table "posts" /usr/bin/ruby1.8 -I "/usr/lib/ruby/gems/1.8/gems/cucumber-0.6.3/lib:lib" "/usr/lib/ruby/gems/1.8/gems/cucumber-0.6.3/bin/cucumber" --profile default Using the default profile... git://github.com/thoughtbot/factory_girl.git (at rails3) is not checked out. Please run `bundle install` (Bundler::PathError) /home/jbpros/.bundle/gems/bundler-0.9.13/lib/bundler/source.rb:282:in `load_spec_files' /home/jbpros/.bundle/gems/bundler-0.9.13/lib/bundler/source.rb:190:in `local_specs' /home/jbpros/.bundle/gems/bundler-0.9.13/lib/bundler/environment.rb:36:in `runtime_gems' /home/jbpros/.bundle/gems/bundler-0.9.13/lib/bundler/environment.rb:35:in `each' /home/jbpros/.bundle/gems/bundler-0.9.13/lib/bundler/environment.rb:35:in `runtime_gems' /home/jbpros/.bundle/gems/bundler-0.9.13/lib/bundler/index.rb:5:in `build' /home/jbpros/.bundle/gems/bundler-0.9.13/lib/bundler/environment.rb:34:in `runtime_gems' /home/jbpros/.bundle/gems/bundler-0.9.13/lib/bundler/environment.rb:14:in `index' /home/jbpros/.bundle/gems/bundler-0.9.13/lib/bundler/index.rb:5:in `build' /home/jbpros/.bundle/gems/bundler-0.9.13/lib/bundler/environment.rb:13:in `index' /home/jbpros/.bundle/gems/bundler-0.9.13/lib/bundler/environment.rb:55:in `resolve_locally' /home/jbpros/.bundle/gems/bundler-0.9.13/lib/bundler/environment.rb:28:in `specs' /home/jbpros/.bundle/gems/bundler-0.9.13/lib/bundler/environment.rb:65:in `specs_for' /home/jbpros/.bundle/gems/bundler-0.9.13/lib/bundler/environment.rb:23:in `requested_specs' /home/jbpros/.bundle/gems/bundler-0.9.13/lib/bundler/runtime.rb:18:in `setup' /home/jbpros/.bundle/gems/bundler-0.9.13/lib/bundler.rb:68:in `setup' /home/jbpros/projects/deorbitburn/config/boot.rb:7 /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require' /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `polyglot_original_require' /usr/lib/ruby/gems/1.8/gems/polyglot-0.3.0/lib/polyglot.rb:65:in `require' /home/jbpros/projects/deorbitburn/config/application.rb:1 /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require' /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `polyglot_original_require' /usr/lib/ruby/gems/1.8/gems/polyglot-0.3.0/lib/polyglot.rb:65:in `require' /home/jbpros/projects/deorbitburn/config/environment.rb:2 /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require' /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `polyglot_original_require' /usr/lib/ruby/gems/1.8/gems/polyglot-0.3.0/lib/polyglot.rb:65:in `require' /home/jbpros/projects/deorbitburn/features/support/env.rb:8 /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require' /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `polyglot_original_require' /usr/lib/ruby/gems/1.8/gems/polyglot-0.3.0/lib/polyglot.rb:65:in `require' /usr/lib/ruby/gems/1.8/gems/cucumber-0.6.3/bin/../lib/cucumber/rb_support/rb_language.rb:124:in `load_code_file' /usr/lib/ruby/gems/1.8/gems/cucumber-0.6.3/bin/../lib/cucumber/step_mother.rb:85:in `load_code_file' /usr/lib/ruby/gems/1.8/gems/cucumber-0.6.3/bin/../lib/cucumber/step_mother.rb:77:in `load_code_files' /usr/lib/ruby/gems/1.8/gems/cucumber-0.6.3/bin/../lib/cucumber/step_mother.rb:76:in `each' /usr/lib/ruby/gems/1.8/gems/cucumber-0.6.3/bin/../lib/cucumber/step_mother.rb:76:in `load_code_files' /usr/lib/ruby/gems/1.8/gems/cucumber-0.6.3/bin/../lib/cucumber/cli/main.rb:48:in `execute!' /usr/lib/ruby/gems/1.8/gems/cucumber-0.6.3/bin/../lib/cucumber/cli/main.rb:20:in `execute' /usr/lib/ruby/gems/1.8/gems/cucumber-0.6.3/bin/cucumber:8 rake aborted! Command failed with status (1): [/usr/bin/ruby1.8 -I "/usr/lib/ruby/gems/1....] (See full trace by running task with --trace) Do I have to do something special for bundler to check out factory girl's repository on github?

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• Is the IP from the source or target in this System.Net.Sockets.SocketException?

  - by Jeremy Mullin

  I'm making an outbound connection using a DNS name to a server other than the localhost, and I get this exception: System.Net.WebException: Unable to connect to the remote server --- System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it 127.0.0.1:5555 The text implies that the TARGET machine refused the connection, but the IP address and port are from the localhost, which is kind of confusing. So is that IP address really the outgoing IP and port, even though the exception was caused by the target refusing the connection? Or is the exception from the local firewall blocking the outgoing connection?

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• What is the best way to documentate a system metaphor?

  - by SDReyes

  A metaphor help us to communicate with our project stakeholders, using a shared set of concepts and analogies. we develop them all the time, in one way or another. even the XP- programming highly recommend to get it defined since project start. How do you write such thing down in a document (specially if it already exists)? maybe a dictionary-like approach?

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• What is the best way to document a system metaphor?

  - by SDReyes

  A metaphor help us to communicate with our project stakeholders, using a shared set of concepts and analogies. we develop them all the time, in one way or another. even the XP- programming highly recommend to get it defined since project start. How do you write such thing down in a document (specially if it already exists)? maybe a dictionary-like approach? UPDATE: perhaps a thesaurus would do it better (synonyms sum).

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• How is a new programming language actually formed/created ?

  - by hory.incpp

  Fortran-Algol-Cpl-Bcpl-C-C++-Java ..... Seems like every language is built upon an ancestor language. My question : New languages extend parent ones or there is some kind of a trick? e.g. System.out.print() in Java ; is it actually printf() in C, and so on (printf is actually .. in Cpl)? If so, doesn't this make every further language be slower and need more memory? What separates a new language from a framework?

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• iTunes crashes with "Attempt to allocate 1073741824 bytes for NS/CFData failed" error

  - by kubi

  This is a pretty common occurrence. Every two days or so iTunes will crash on me with this error. FYI, 1073741824 is 2^30, which is gigabyte. The crash log is below if you're interested. Process: iTunes [40778] Path: /Applications/iTunes.app/Contents/MacOS/iTunes Identifier: com.apple.iTunes Version: 9.0.1 (9.0.1) Build Info: iTunes-9010901~2 Code Type: X86 (Native) Parent Process: launchd [638] Date/Time: 2009-10-21 11:35:55.159 -0400 OS Version: Mac OS X 10.6.1 (10B504) Report Version: 6 Interval Since Last Report: 38292 sec Per-App Interval Since Last Report: 63956 sec Per-App Crashes Since Last Report: 1 Anonymous UUID: A7149D8A-1161-4740-976B-DB99AE1B01DD Exception Type: EXC_BREAKPOINT (SIGTRAP) Exception Codes: 0x0000000000000002, 0x0000000000000000 Crashed Thread: 13 Application Specific Information: *** Terminating app due to uncaught exception 'NSMallocException', reason: 'Attempt to allocate 1073741824 bytes for NS/CFData failed' *** Call stack at first throw: ( 0 CoreFoundation 0x9924958a __raiseError + 410 1 libobjc.A.dylib 0x9440df49 objc_exception_throw + 56 2 Foundation 0x945e2fda _NSSearchForNameInPath + 0 3 CoreFoundation 0x99262ca5 __CFDataHandleOutOfMemory + 101 4 CoreFoundation 0x9919f27d __CFDataGrow + 717 5 CoreFoundation 0x9919ce0a CFDataReplaceBytes + 362 6 CoreFoundation 0x9919e63a CFDataAppendBytes + 154 7 iTunes 0x00522808 0x0 + 5384200 8 iTunes 0x00523471 0x0 + 5387377 9 iTunes 0x00441bc8 0x0 + 4463560 10 CoreFoundation 0x9923eba3 _signalEventSync + 99 11 CoreFoundation 0x9923f58e _cfstream_solo_signalEventSync + 126 12 CoreFoundation 0x9923f4d7 CFReadStreamSignalEvent + 39 13 CFNetwork 0x97374c23 _ZN14HTTPReadStream11streamEventEm + 169 14 CoreFoundation 0x9923eba3 _signalEventSync + 99 15 CoreFoundation 0x9923eb1a _cfstream_shared_signalEventSync + 458 16 CoreFoundation 0x991b58cb __CFRunLoopDoSources0 + 1563 17 CoreFoundation 0x991b385f __CFRunLoopRun + 1071 18 CoreFoundation 0x991b2d34 CFRunLoopRunSpecific + 452 19 CoreFoundation 0x991b87a4 CFRunLoopRun + 84 20 iTunes 0x0000ade8 0x0 + 44520 21 libSystem.B.dylib 0x96de9f39 _pthread_start + 345 22 libSystem.B.dylib 0x96de9dbe thread_start + 34 ) Thread 0: Dispatch queue: com.apple.main-thread 0 libSystem.B.dylib 0x96dbc7da mach_msg_trap + 10 1 libSystem.B.dylib 0x96dbcf47 mach_msg + 68 2 com.apple.CoreFoundation 0x991b3dbf __CFRunLoopRun + 2447 3 com.apple.CoreFoundation 0x991b2d34 CFRunLoopRunSpecific + 452 4 com.apple.CoreFoundation 0x991b2b61 CFRunLoopRunInMode + 97 5 com.apple.HIToolbox 0x97c3bfec RunCurrentEventLoopInMode + 392 6 com.apple.HIToolbox 0x97c3bda3 ReceiveNextEventCommon + 354 7 com.apple.HIToolbox 0x97dc3d91 ReceiveNextEvent + 83 8 com.apple.iTunes 0x00135fae 0x1000 + 1265582 9 com.apple.HIToolbox 0x97c0f129 DispatchEventToHandlers(EventTargetRec*, OpaqueEventRef*, HandlerCallRec*) + 1567 10 com.apple.HIToolbox 0x97c0e3f0 SendEventToEventTargetInternal(OpaqueEventRef*, OpaqueEventTargetRef*, HandlerCallRec*) + 411 11 com.apple.HIToolbox 0x97c0e24f SendEventToEventTargetWithOptions + 58 12 com.apple.HIToolbox 0x97c42c0c ToolboxEventDispatcherHandler(OpaqueEventHandlerCallRef*, OpaqueEventRef*, void*) + 3006 13 com.apple.HIToolbox 0x97c0f57a DispatchEventToHandlers(EventTargetRec*, OpaqueEventRef*, HandlerCallRec*) + 2672 14 com.apple.HIToolbox 0x97c0e3f0 SendEventToEventTargetInternal(OpaqueEventRef*, OpaqueEventTargetRef*, HandlerCallRec*) + 411 15 com.apple.HIToolbox 0x97c30a81 SendEventToEventTarget + 52 16 com.apple.HIToolbox 0x97db98f7 ToolboxEventDispatcher + 86 17 com.apple.HIToolbox 0x97db9a2f RunApplicationEventLoop + 243 18 com.apple.iTunes 0x00135d84 0x1000 + 1265028 19 com.apple.iTunes 0x00135c70 0x1000 + 1264752 20 com.apple.iTunes 0x0000d2af 0x1000 + 49839 21 com.apple.iTunes 0x000049a8 0x1000 + 14760 22 com.apple.iTunes 0x00002bfb 0x1000 + 7163 23 com.apple.iTunes 0x00002b29 0x1000 + 6953 Thread 1: Dispatch queue: com.apple.libdispatch-manager 0 libSystem.B.dylib 0x96de303a kevent + 10 1 libSystem.B.dylib 0x96de3768 _dispatch_mgr_invoke + 215 2 libSystem.B.dylib 0x96de2bf9 _dispatch_queue_invoke + 183 3 libSystem.B.dylib 0x96de298a _dispatch_worker_thread2 + 234 4 libSystem.B.dylib 0x96de2401 _pthread_wqthread + 390 5 libSystem.B.dylib 0x96de2246 start_wqthread + 30 Thread 2: 0 libSystem.B.dylib 0x96dbc7da mach_msg_trap + 10 1 libSystem.B.dylib 0x96dbcf47 mach_msg + 68 2 com.apple.CoreFoundation 0x991b3dbf __CFRunLoopRun + 2447 3 com.apple.CoreFoundation 0x991b2d34 CFRunLoopRunSpecific + 452 4 com.apple.CoreFoundation 0x991b87a4 CFRunLoopRun + 84 5 com.apple.iTunes 0x0000ade8 0x1000 + 40424 6 libSystem.B.dylib 0x96de9f39 _pthread_start + 345 7 libSystem.B.dylib 0x96de9dbe thread_start + 34 Thread 3: 0 libSystem.B.dylib 0x96ddb756 select$DARWIN_EXTSN + 10 1 com.apple.CoreFoundation 0x991f304d __CFSocketManager + 1085 2 libSystem.B.dylib 0x96de9f39 _pthread_start + 345 3 libSystem.B.dylib 0x96de9dbe thread_start + 34 Thread 4: 0 libSystem.B.dylib 0x96e84766 accept$NOCANCEL$UNIX2003 + 10 1 libSystem.B.dylib 0x96e8363e accept + 32 2 com.apple.iTunes 0x0044c792 0x1000 + 4503442 3 com.apple.iTunes 0x004a86cd 0x1000 + 4880077 4 com.apple.iTunes 0x004a879b 0x1000 + 4880283 5 libSystem.B.dylib 0x96de9f39 _pthread_start + 345 6 libSystem.B.dylib 0x96de9dbe thread_start + 34 Thread 5: 0 libSystem.B.dylib 0x96e84766 accept$NOCANCEL$UNIX2003 + 10 1 libSystem.B.dylib 0x96e8363e accept + 32 2 com.apple.iTunes 0x0044c792 0x1000 + 4503442 3 com.apple.iTunes 0x004a86cd 0x1000 + 4880077 4 com.apple.iTunes 0x004a879b 0x1000 + 4880283 5 libSystem.B.dylib 0x96de9f39 _pthread_start + 345 6 libSystem.B.dylib 0x96de9dbe thread_start + 34 Thread 6: 0 libSystem.B.dylib 0x96dbc7da mach_msg_trap + 10 1 libSystem.B.dylib 0x96dbcf47 mach_msg + 68 2 com.apple.CoreFoundation 0x991b3dbf __CFRunLoopRun + 2447 3 com.apple.CoreFoundation 0x991b2d34 CFRunLoopRunSpecific + 452 4 com.apple.CoreFoundation 0x991b87a4 CFRunLoopRun + 84 5 com.apple.iTunes 0x00135e09 0x1000 + 1265161 6 com.apple.iTunes 0x00135cc5 0x1000 + 1264837 7 libSystem.B.dylib 0x96de9f39 _pthread_start + 345 8 libSystem.B.dylib 0x96de9dbe thread_start + 34 Thread 7: 0 libSystem.B.dylib 0x96dbc7da mach_msg_trap + 10 1 libSystem.B.dylib 0x96dbcf47 mach_msg + 68 2 com.apple.CoreFoundation 0x991b3dbf __CFRunLoopRun + 2447 3 com.apple.CoreFoundation 0x991b2d34 CFRunLoopRunSpecific + 452 4 com.apple.CoreFoundation 0x991b87a4 CFRunLoopRun + 84 5 com.apple.iTunes 0x0000ade8 0x1000 + 40424 6 libSystem.B.dylib 0x96de9f39 _pthread_start + 345 7 libSystem.B.dylib 0x96de9dbe thread_start + 34 Thread 8: 0 libSystem.B.dylib 0x96dbc83a semaphore_timedwait_signal_trap + 10 1 libSystem.B.dylib 0x96dea3c1 _pthread_cond_wait + 1066 2 libSystem.B.dylib 0x96e19208 pthread_cond_timedwait_relative_np + 47 3 com.apple.iTunes 0x0004ca83 0x1000 + 309891 4 com.apple.iTunes 0x0004c7cb 0x1000 + 309195 5 com.apple.iTunes 0x0004c76a 0x1000 + 309098 6 com.apple.iTunes 0x0004c5bb 0x1000 + 308667 7 libSystem.B.dylib 0x96de9f39 _pthread_start + 345 8 libSystem.B.dylib 0x96de9dbe thread_start + 34 Thread 9: 0 libSystem.B.dylib 0x96dbc7da mach_msg_trap + 10 1 libSystem.B.dylib 0x96dbcf47 mach_msg + 68 2 com.apple.CoreFoundation 0x991b3dbf __CFRunLoopRun + 2447 3 com.apple.CoreFoundation 0x991b2d34 CFRunLoopRunSpecific + 452 4 com.apple.CoreFoundation 0x991b87a4 CFRunLoopRun + 84 5 com.apple.iTunes 0x0000ade8 0x1000 + 40424 6 libSystem.B.dylib 0x96de9f39 _pthread_start + 345 7 libSystem.B.dylib 0x96de9dbe thread_start + 34 Thread 10: 0 libSystem.B.dylib 0x96dbc7da mach_msg_trap + 10 1 libSystem.B.dylib 0x96dbcf47 mach_msg + 68 2 com.apple.CoreFoundation 0x991b3dbf __CFRunLoopRun + 2447 3 com.apple.CoreFoundation 0x991b2d34 CFRunLoopRunSpecific + 452 4 com.apple.CoreFoundation 0x991b87a4 CFRunLoopRun + 84 5 com.apple.iTunes 0x0000ade8 0x1000 + 40424 6 libSystem.B.dylib 0x96de9f39 _pthread_start + 345 7 libSystem.B.dylib 0x96de9dbe thread_start + 34 Thread 11: 0 libSystem.B.dylib 0x96dbc7da mach_msg_trap + 10 1 libSystem.B.dylib 0x96dbcf47 mach_msg + 68 2 com.apple.CoreFoundation 0x991b3dbf __CFRunLoopRun + 2447 3 com.apple.CoreFoundation 0x991b2d34 CFRunLoopRunSpecific + 452 4 com.apple.CoreFoundation 0x991b87a4 CFRunLoopRun + 84 5 com.apple.iTunes 0x0000ade8 0x1000 + 40424 6 libSystem.B.dylib 0x96de9f39 _pthread_start + 345 7 libSystem.B.dylib 0x96de9dbe thread_start + 34 Thread 12: 0 libSystem.B.dylib 0x96dbc822 semaphore_wait_signal_trap + 10 1 libSystem.B.dylib 0x96dea3d8 _pthread_cond_wait + 1089 2 libSystem.B.dylib 0x96e3370f pthread_cond_wait + 48 3 com.apple.iTunes 0x0000ae70 0x1000 + 40560 4 com.apple.iTunes 0x0000ad06 0x1000 + 40198 5 com.apple.iTunes 0x004418a1 0x1000 + 4458657 6 com.apple.iTunes 0x0043f960 0x1000 + 4450656 7 com.apple.iTunes 0x00525475 0x1000 + 5391477 8 com.apple.iTunes 0x00525c0d 0x1000 + 5393421 9 com.apple.iTunes 0x0004c62c 0x1000 + 308780 10 libSystem.B.dylib 0x96de9f39 _pthread_start + 345 11 libSystem.B.dylib 0x96de9dbe thread_start + 34 Thread 13 Crashed: 0 com.apple.CoreFoundation 0x99293b07 ___TERMINATING_DUE_TO_UNCAUGHT_EXCEPTION___ + 7 1 libobjc.A.dylib 0x9440df49 objc_exception_throw + 56 2 com.apple.CoreFoundation 0x991b2fbc CFRunLoopRunSpecific + 1100 3 com.apple.CoreFoundation 0x991b87a4 CFRunLoopRun + 84 4 com.apple.iTunes 0x0000ade8 0x1000 + 40424 5 libSystem.B.dylib 0x96de9f39 _pthread_start + 345 6 libSystem.B.dylib 0x96de9dbe thread_start + 34 Thread 14: 0 libSystem.B.dylib 0x96dbc7da mach_msg_trap + 10 1 libSystem.B.dylib 0x96dbcf47 mach_msg + 68 2 com.apple.CoreFoundation 0x991b3dbf __CFRunLoopRun + 2447 3 com.apple.CoreFoundation 0x991b2d34 CFRunLoopRunSpecific + 452 4 com.apple.CoreFoundation 0x991b87a4 CFRunLoopRun + 84 5 com.apple.iTunes 0x0000ade8 0x1000 + 40424 6 libSystem.B.dylib 0x96de9f39 _pthread_start + 345 7 libSystem.B.dylib 0x96de9dbe thread_start + 34 Thread 15: 0 libSystem.B.dylib 0x96dbc822 semaphore_wait_signal_trap + 10 1 libSystem.B.dylib 0x96dea3d8 _pthread_cond_wait + 1089 2 libSystem.B.dylib 0x96e3370f pthread_cond_wait + 48 3 ...ickTimeComponents.component 0x915275b7 jpegdecompress_MPLoop + 79 4 libSystem.B.dylib 0x96de9f39 _pthread_start + 345 5 libSystem.B.dylib 0x96de9dbe thread_start + 34 Thread 16: 0 libSystem.B.dylib 0x96dbc822 semaphore_wait_signal_trap + 10 1 libSystem.B.dylib 0x96dea3d8 _pthread_cond_wait + 1089 2 libSystem.B.dylib 0x96e3370f pthread_cond_wait + 48 3 com.apple.iTunes 0x00025d27 0x1000 + 150823 4 com.apple.iTunes 0x00025237 0x1000 + 148023 5 libSystem.B.dylib 0x96de9f39 _pthread_start + 345 6 libSystem.B.dylib 0x96de9dbe thread_start + 34 Thread 17: 0 libSystem.B.dylib 0x96de2092 __workq_kernreturn + 10 1 libSystem.B.dylib 0x96de2628 _pthread_wqthread + 941 2 libSystem.B.dylib 0x96de2246 start_wqthread + 30 Thread 18: 0 libSystem.B.dylib 0x96dbc83a semaphore_timedwait_signal_trap + 10 1 libSystem.B.dylib 0x96dea3c1 _pthread_cond_wait + 1066 2 libSystem.B.dylib 0x96e19208 pthread_cond_timedwait_relative_np + 47 3 com.apple.iTunes 0x0004ca83 0x1000 + 309891 4 com.apple.iTunes 0x0004c7cb 0x1000 + 309195 5 com.apple.iTunes 0x0004c76a 0x1000 + 309098 6 com.apple.iTunes 0x0004c5bb 0x1000 + 308667 7 libSystem.B.dylib 0x96de9f39 _pthread_start + 345 8 libSystem.B.dylib 0x96de9dbe thread_start + 34 Thread 13 crashed with X86 Thread State (32-bit): eax: 0x00000000 ebx: 0x9440df25 ecx: 0xb08b2000 edx: 0x0000003b edi: 0xa0737ab0 esi: 0x19685e20 ebp: 0xb08b1de8 esp: 0xb08b1dd0 ss: 0x0000001f efl: 0x00000282 eip: 0x99293b07 cs: 0x00000017 ds: 0x0000001f es: 0x0000001f fs: 0x0000001f gs: 0x00000037 cr2: 0x00ff9000 Binary Images: 0x1000 - 0xbd9ff8 com.apple.iTunes 9.0.1 (9.0.1) <18B3F1D1-1E3E-6DD1-CB52-F346ACB01921> /Applications/iTunes.app/Contents/MacOS/iTunes 0xdf9000 - 0xe01ff7 com.apple.ipodsynchronization 3.0 (116) <B41B2240-34E9-4A5E-A210-F02D99E3C00E> /System/Library/PrivateFrameworks/iPodSync.framework/Versions/A/iPodSync 0xe09000 - 0xe0eff7 com.apple.iPod 1.6 (17) <4CCD2720-D270-C0D2-1E14-1374779C2401> /System/Library/PrivateFrameworks/iPod.framework/Versions/A/iPod 0xe14000 - 0xe9bfe3 com.apple.iTunes.iPodUpdater 9.0 (9.0) <474ED35C-EDCE-1FEB-AC8C-075B806977A8> /Applications/iTunes.app/Contents/Frameworks/iPodUpdater.framework/Versions/A/iPodUpdater 0xee7000 - 0xf27ff7 com.apple.vmutils 4.2 (106) <834EA6B0-C91B-4CF1-ED3C-229C26459578> /System/Library/PrivateFrameworks/vmutils.framework/Versions/A/vmutils 0x14be000 - 0x14beff7 libmx.A.dylib ??? (???) <01401BF8-3FC7-19CF-ACCE-0F292BFD2F25> /usr/lib/libmx.A.dylib 0x14d0000 - 0x14d0ff7 +net.sourceforge.SafariAdBlockLoader 0.4.0 RC3 (0.4.0 RC3) <8E9A6641-9CE7-5416-DC84-883DB8BAFDDA> /Library/InputManagers/Safari AdBlock/Safari AdBlock Loader.bundle/Contents/MacOS/Safari AdBlock Loader 0x15f8000 - 0x15f9ff7 com.apple.textencoding.unicode 2.3 (2.3) <78A61FD5-70EE-19EA-48D4-3481C640B70D> /System/Library/TextEncodings/Unicode Encodings.bundle/Contents/MacOS/Unicode Encodings 0x1778000 - 0x179efff libssl.0.9.7.dylib ??? (???) <8BF98B2F-0F55-40CA-C082-43C76707BD24> /usr/lib/libssl.0.9.7.dylib 0x17e6000 - 0x17eaff3 com.apple.audio.AudioIPCPlugIn 1.1.0 (1.1.0) <39CD9296-183C-5603-94A4-0A0EC327BA69> /System/Library/Extensions/AudioIPCDriver.kext/Contents/Resources/AudioIPCPlugIn.bundle/Contents/MacOS/AudioIPCPlugIn 0x17ef000 - 0x17f4ffb com.apple.audio.AppleHDAHALPlugIn 1.7.4 (1.7.4a1) <B4217DD8-4BDE-CC1C-70FF-06EA901F376D> /System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn 0x12800000 - 0x138eaff7 com.apple.CoreFP 1.5.18 (1.5) <740FE25C-0539-AEFF-2108-C2C0D338CDCE> /System/Library/PrivateFrameworks/CoreFP.framework/CoreFP 0x1390f000 - 0x139c4fe7 libcrypto.0.9.7.dylib ??? (???) <4917E4F2-817F-5AC4-3FBE-54BC96360448> /usr/lib/libcrypto.0.9.7.dylib 0x13a0a000 - 0x13a50ff3 com.apple.mobiledevice 251.6 (251.6) <E998830A-CFBF-3060-4770-1089AED68444> /System/Library/PrivateFrameworks/MobileDevice.framework/MobileDevice 0x167f5000 - 0x167f7ff7 com.apple.PDFImporter 2.1 (???) <C78368B0-3712-067C-9467-55932890C979> /System/Library/Components/PDFImporter.component/Contents/MacOS/PDFImporter 0x16900000 - 0x16905ff7 com.apple.QuartzComposer.iTunesPlugIn 1.2 (16) <8511A037-AFDE-5D1A-67DA-1B4837432D85> /Library/iTunes/iTunes Plug-ins/Quartz Composer Visualizer.bundle/Contents/MacOS/Quartz Composer Visualizer 0x17fa8000 - 0x181cbfe7 com.apple.audio.codecs.Components 2.0 (2.0) <064E9181-38CC-C2D3-070D-4D162D2903E8> /System/Library/Components/AudioCodecs.component/Contents/MacOS/AudioCodecs 0x18764000 - 0x1877efc3 com.apple.AppleIntermediateCodec 1.2 (145) /Library/QuickTime/AppleIntermediateCodec.component/Contents/MacOS/AppleIntermediateCodec 0x18783000 - 0x18788ff7 com.apple.AppleMPEG2Codec 1.0.1 (220) <6FDFF3C8-7ECE-CB74-1374-9C0230C54F78> /Library/QuickTime/AppleMPEG2Codec.component/Contents/MacOS/AppleMPEG2Codec 0x19137000 - 0x1918cfef com.apple.AppleProResDecoder 2.0 (223) <793BA98A-2E7D-1C39-998D-805B60034DF4> /System/Library/QuickTime/AppleProResDecoder.component/Contents/MacOS/AppleProResDecoder 0x191c4000 - 0x191ddfe7 com.apple.applepixletvideo 1.2.19 (1.2d19) <4A68731C-8071-6CF5-012C-40F00CD1333A> /System/Library/QuickTime/ApplePixletVideo.component/Contents/MacOS/ApplePixletVideo 0x19400000 - 0x19479fef com.apple.AppleVAH264HW.component 2.0 (1.0) <FFC0DED4-1AA1-267E-CE43-0261727DA31D> /System/Library/QuickTime/AppleVAH264HW.component/Contents/MacOS/AppleVAH264HW 0x1953b000 - 0x19577fe3 com.apple.QuickTimeFireWireDV.component 7.6.3 (1584) <8E3D38A3-1005-305C-7B70-D400AB4AC0F3> /System/Library/QuickTime/QuickTimeFireWireDV.component/Contents/MacOS/QuickTimeFireWireDV 0x1a000000 - 0x1a312fe0 +org.perian.Perian 1.1.4 (1.1.4) <577A3B05-0FF7-FC3D-3223-88718A00D84C> /Library/QuickTime/Perian.component/Contents/MacOS/Perian 0x70000000 - 0x700cbfe7 com.apple.audio.units.Components 1.6 (1.6) <A568FC6D-1D2D-A04B-FD1A-AFF6E326E020> /System/Library/Components/CoreAudio.component/Contents/MacOS/CoreAudio 0x8fe00000 - 0x8fe4162b dyld 132.1 (???) <211AF0DD-42D9-79C8-BB6A-1F4BEEF4B4AB> /usr/lib/dyld 0x900cb000 - 0x900ccff7 com.apple.audio.units.AudioUnit 1.6 (1.6) <68180B96-381C-A09D-5576-606A134FD953> /System/Library/Frameworks/AudioUnit.framework/Versions/A/AudioUnit 0x900cd000 - 0x908b2fe7 com.apple.WebCore 6531 (6531.9) <F9A9848B-9EB0-B912-49F5-7E8010AF2CF1> /System/Library/Frameworks/WebKit.framework/Versions/A/Frameworks/WebCore.framework/Versions/A/WebCore 0x908b3000 - 0x908effff com.apple.CoreMediaIOServices 101.0 (715) <FD86FB28-9BA1-0993-1172-F10F61EA6344> /System/Library/PrivateFrameworks/CoreMediaIOServices.framework/Versions/A/CoreMediaIOServices 0x9095f000 - 0x90970ff7 com.apple.LangAnalysis 1.6.5 (1.6.5) <E77440D0-76EE-EB4C-3D00-9EDE417F13CF> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/LangAnalysis.framework/Versions/A/LangAnalysis 0x909ba000 - 0x90bb7feb com.apple.AddressBook.framework 5.0 (862) <BD05B213-46CF-8EFD-B801-CF741408600D> /System/Library/Frameworks/AddressBook.framework/Versions/A/AddressBook 0x90bd9000 - 0x90c03ff7 com.apple.shortcut 1.1 (1.1) <B0514FA9-7CAE-AD94-93CA-7B2A2C5F7B8A> /System/Library/PrivateFrameworks/Shortcut.framework/Versions/A/Shortcut 0x90c04000 - 0x90c23fe7 com.apple.opencl 11 (11) <372A42E7-FB10-B74D-E1A0-980E94D07021> /System/Library/Frameworks/OpenCL.framework/Versions/A/OpenCL 0x90c24000 - 0x90c24ff7 com.apple.Accelerate 1.5 (Accelerate 1.5) <F642E7A0-3720-FA19-0190-E6DBD9EF2D9B> /System/Library/Frameworks/Accelerate.framework/Versions/A/Accelerate 0x90c25000 - 0x90c25ff7 com.apple.ApplicationServices 38 (38) <8012B504-3D83-BFBB-DA65-065E061CFE03> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices 0x90d7c000 - 0x90db6fe7 libFontRegistry.dylib ??? (???) <EE633CF6-8827-EF05-10A4-5F2937120227> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/libFontRegistry.dylib 0x90db7000 - 0x91d45ff7 com.apple.QuickTimeComponents.component 7.6.3 (1584) /System/Library/QuickTime/QuickTimeComponents.component/Contents/MacOS/QuickTimeComponents 0x91d46000 - 0x91d7cfff libtidy.A.dylib ??? (???) <DDFAB560-3883-A6A2-7BDD-D91730982B48> /usr/lib/libtidy.A.dylib 0x91d8d000 - 0x91d92ff7 com.apple.OpenDirectory 10.6 (10.6) <92582807-E8F3-3DD9-EB42-4195CFB754A1> /System/Library/Frameworks/OpenDirectory.framework/Versions/A/OpenDirectory 0x91d93000 - 0x91d9aff7 com.apple.agl 3.0.12 (AGL-3.0.12) <6BF89127-C18C-27A9-F94A-981836A822FE> /System/Library/Frameworks/AGL.framework/Versions/A/AGL 0x91d9b000 - 0x91ddbff3 com.apple.securityinterface 4.0 (36981) <F024C5CA-0762-1599-5BAB-17F785E51075> /System/Library/Frameworks/SecurityInterface.framework/Versions/A/SecurityInterface 0x91e0d000 - 0x91e5dfe7 libGLU.dylib ??? (???) <55A69DCE-1237-341E-F239-CDFE1F5B19BB> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLU.dylib 0x91e5e000 - 0x91ee0ffb SecurityFoundation ??? (???) <29C27E0E-B2B3-BF6B-B1F8-5783B8B01535> /System/Library/Frameworks/SecurityFoundation.framework/Versions/A/SecurityFoundation 0x91f28000 - 0x9235dff7 libLAPACK.dylib ??? (???) <5E2D2283-57DE-9A49-1DB0-CD027FEFA6C2> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLAPACK.dylib 0x9236b000 - 0x9237ffe7 libbsm.0.dylib ??? (???) <14CB053A-7C47-96DA-E415-0906BA1B78C9> /usr/lib/libbsm.0.dylib 0x923bb000 - 0x924e4fe7 com.apple.audio.toolbox.AudioToolbox 1.6 (1.6) <62BEEBE6-68FC-4A48-91CF-39DA2BD793F1> /System/Library/Frameworks/AudioToolbox.framework/Versions/A/AudioToolbox 0x924fe000 - 0x925b0ffb libFontParser.dylib ??? (???) <EB089832-660F-0B34-3AC8-CCDA937987D9> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/libFontParser.dylib 0x9264d000 - 0x9264fff7 libRadiance.dylib ??? (???) <0E03CF64-0931-7B9A-F617-4387B809D6D8> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libRadiance.dylib 0x92650000 - 0x92696ff7 libauto.dylib ??? (???) <FAB17F30-A28B-E33D-6E21-C7119C9C83ED> /usr/lib/libauto.dylib 0x92697000 - 0x928c2ff3 com.apple.QuartzComposer 4.0 (156.6) <D1D3A5A8-75BC-4556-85FA-8A9F487106DD> /System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/QuartzComposer.framework/Versions/A/QuartzComposer 0x928c3000 - 0x92913ff7 com.apple.framework.familycontrols 2.0 (2.0) <50617342-E578-4C1C-938A-19A37ECA91CA> /System/Library/PrivateFrameworks/FamilyControls.framework/Versions/A/FamilyControls 0x92914000 - 0x92c0dfef com.apple.QuickTime 7.6.3 (1584) <687233E1-F428-5224-08D5-5874BEA2300D> /System/Library/Frameworks/QuickTime.framework/Versions/A/QuickTime 0x92c22000 - 0x92d62ff7 com.apple.syncservices 5.0 (575) <61B36E07-6D14-97DC-122F-41EDE1F6DB03> /System/Library/Frameworks/SyncServices.framework/Versions/A/SyncServices 0x92d6e000 - 0x92d9fff3 libTrueTypeScaler.dylib ??? (???) <F326E053-7425-2F10-F883-CBD56A1E1B72> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/libTrueTypeScaler.dylib 0x92da0000 - 0x92dc0fe7 libresolv.9.dylib ??? (???) <A48921CB-3FA7-3071-AF9C-2D86FB493A3A> /usr/lib/libresolv.9.dylib 0x92dca000 - 0x92ed7ff7 com.apple.MediaToolbox 0.420.17 (420.17) <EE843140-C79F-3D8C-B89E-893CD74C3633> /System/Library/PrivateFrameworks/MediaToolbox.framework/Versions/A/MediaToolbox 0x92f4a000 - 0x92ff9fe3 com.apple.QuickTimeImporters.component 7.6.3 (1584) <34BF4FBA-BFCD-9A47-4BA9-E2B155C5C881> /System/Library/QuickTime/QuickTimeImporters.component/Contents/MacOS/QuickTimeImporters 0x92ffa000 - 0x930a9fef com.apple.ColorSync 4.6.0 (4.6.0) <66ABAE86-B0EC-D641-913D-08ACA965F9FA> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ColorSync.framework/Versions/A/ColorSync 0x930aa000 - 0x931a0ff7 libGLProgrammability.dylib ??? (???) <B8E40851-3A01-7D01-2F96-537BF7FA63B5> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLProgrammability.dylib 0x931a8000 - 0x93200fe7 com.apple.datadetectorscore 2.0 (80.7) <A40AA74A-9D13-2A6C-5440-B50905923251> /System/Library/PrivateFrameworks/DataDetectorsCore.framework/Versions/A/DataDetectorsCore 0x93201000 - 0x93228ff7 com.apple.quartzfilters 1.6.0 (1.6.0) <879A3B93-87A6-88FE-305D-DF1EAED04756> /System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/QuartzFilters.framework/Versions/A/QuartzFilters 0x93229000 - 0x9327aff7 com.apple.HIServices 1.8.0 (???) <B8EC13DB-A81A-91BF-8C82-66E840C64C91> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/HIServices 0x9327b000 - 0x932b6fe7 com.apple.DebugSymbols 1.1 (70) <05013716-CFCF-801E-5535-D0643869BDCD> /System/Library/PrivateFrameworks/DebugSymbols.framework/Versions/A/DebugSymbols 0x932b7000 - 0x93304feb com.apple.DirectoryService.PasswordServerFramework 6.0 (6.0) <BF66BA5D-BBC8-78A5-DBE2-F9DE3DD1D775> /System/Library/PrivateFrameworks/PasswordServer.framework/Versions/A/PasswordServer 0x93305000 - 0x93319ffb com.apple.speech.synthesis.framework 3.10.35 (3.10.35) <57DD5458-4F24-DA7D-0927-C3321A65D743> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/SpeechSynthesis.framework/Versions/A/SpeechSynthesis 0x9331a000 - 0x9335eff3 com.apple.coreui 0.2 (112) <A810DFFD-6314-5E2B-93A4-D5626634B1EE> /System/Library/PrivateFrameworks/CoreUI.framework/Versions/A/CoreUI 0x9335f000 - 0x93418fe7 libsqlite3.dylib ??? (???) <16CEF8E8-8C9A-94CD-EF5D-05477844C005> /usr/lib/libsqlite3.dylib 0x93419000 - 0x93473ff7 com.apple.framework.IOKit 2.0 (???) <7618DDEC-2E3B-9C6E-FDC9-15169E24B4FB> /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit 0x93474000 - 0x934edff3 com.apple.audio.CoreAudio 3.2.0 (3.2) <91AE891E-6015-AABE-3512-2D5EBCA0937B> /System/Library/Frameworks/CoreAudio.framework/Versions/A/CoreAudio 0x934ee000 - 0x935effe7 libxml2.2.dylib ??? (???) <C242A74D-280A-90C3-3F79-891624AA45D2> /usr/lib/libxml2.2.dylib 0x935f0000 - 0x93634fe7 com.apple.Metadata 10.6.0 (507.1) <CBD1B22B-5F10-C784-03A2-35106B97DF3F> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/Metadata.framework/Versions/A/Metadata 0x93635000 - 0x93637ff7 com.apple.QuickTimeH264.component 7.6.3 (1584) /System/Library/QuickTime/QuickTimeH264.component/Contents/MacOS/QuickTimeH264 0x93639000 - 0x93654ff7 libPng.dylib ??? (???) <38DD4AA1-0643-85A0-F2F5-EE9269729975> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libPng.dylib 0x93655000 - 0x936affe7 com.apple.CorePDF 1.0 (1.0) <590244C9-15D7-7A65-13AF-6F597123746B> /System/Library/PrivateFrameworks/CorePDF.framework/Versions/A/CorePDF 0x936b0000 - 0x936e8ff7 com.apple.LDAPFramework 2.0 (120.1) <8C7F3F42-6A4D-D37A-4232-685D44E8769E> /System/Library/Frameworks/LDAP.framework/Versions/A/LDAP 0x93723000 - 0x93757ff7 libcups.2.dylib ??? (???) <9078BA07-DEE1-6597-D15D-7BE3A20CB5A0> /usr/lib/libcups.2.dylib 0x93758000 - 0x93758ff7 liblangid.dylib ??? (???) <B99607FC-5646-32C8-2C16-AFB5EA9097C2> /usr/lib/liblangid.dylib 0x93759000 - 0x9375cffb com.apple.help 1.3.1 (41) <67F1F424-3983-7A2A-EC21-867BE838E90B> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Help.framework/Versions/A/Help 0x9375d000 - 0x937d4feb com.apple.backup.framework 1.1 (1.0) <73C642BD-

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• FluentPath: a fluent wrapper around System.IO

  - by Bertrand Le Roy

  .NET is now more than eight years old, and some of its APIs got old with more grace than others. System.IO in particular has always been a little awkward. It’s mostly static method calls (Path.*, Directory.*, etc.) and some stateful classes (DirectoryInfo, FileInfo). In these APIs, paths are plain strings. Since .NET v1, lots of good things happened to C#: lambda expressions, extension methods, optional parameters to name just a few. Outside of .NET, other interesting things happened as well. For example, you might have heard about this JavaScript library that had some success introducing a fluent API to handle the hierarchical structure of the HTML DOM. You know? jQuery. Knowing all that, every time I need to use the stuff in System.IO, I cringe. So I thought I’d just build a more modern wrapper around it. I used a fluent API based on an essentially immutable Path type and an enumeration of such path objects. To achieve the fluent style, a healthy dose of lambda expressions is being used to act on the objects. Without further ado, here’s an example of what you can do with the new API. In that example, I’m using a Media Center extension that wants all video files to be in their own folder. For that, I need a small tool that creates directories for each video file and moves the files in there. Here’s the code for it: Path.Get(args[0]) .Select(p => p.Extension == ".avi" || p.Extension == ".m4v" || p.Extension == ".wmv" || p.Extension == ".mp4" || p.Extension == ".dvr-ms" || p.Extension == ".mpg" || p.Extension == ".mkv") .CreateDirectory(p => p.Parent .Combine(p.FileNameWithoutExtension)) .Previous() .Move(p => p.Parent .Combine(p.FileNameWithoutExtension) .Combine(p.FileName)); This code creates a Path object pointing at the path pointed to by the first command line argument of my executable. It then selects all video files. After that, it creates directories that have the same names as each of the files, but without their extension. The result of that operation is the set of created directories. We can now get back to the previous set using the Previous method, and finally we can move each of the files in the set to the corresponding freshly created directory, whose name is the combination of the parent directory and the filename without extension. The new fluent path library covers a fair part of what’s in System.IO in a single, convenient API. Check it out, I hope you’ll enjoy it. Suggestions are more than welcome. For example, should I make this its own project on CodePlex or is this informal style just OK? Anything missing that you’d like to see? Is there a specific example you’d like to see expressed with the new API? Bugs? The code can be downloaded from here (this is under a new BSD license): http://weblogs.asp.net/blogs/bleroy/Samples/FluentPath.zip

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• Swap not available on System Monitor

  - by Zaki

  I had a swap partition of 1GB (RAM 1GB, Ubuntu 12.04 lts). Now swap is not shown on System Monitor neither can I hibernate my pc (sudo pm-hibernate). blkid output: /dev/sda1: UUID="B8B4FBB1B4FB706C" TYPE="ntfs" /dev/sda2: UUID="2ea7d608-2d89-4e41-9436-d05cb3ce8871" TYPE="swap" /dev/sda3: UUID="3219d03a-67e4-454b-8ce7-a27831846e35" TYPE="ext4" /dev/sda5: LABEL="Softwares" UUID="AC1CC3301CC2F47C" TYPE="ntfs" /dev/sda6: LABEL="Education" UUID="1E103E6C103E4B53" TYPE="ntfs" /dev/sda7: LABEL="Recreation" UUID="2CC8D181C8D149AA" TYPE="ntfs" /dev/sda8: LABEL="Miscellaneous" UUID="0274D6B174D6A727" TYPE="ntfs" /etc/fstab # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc nodev,noexec,nosuid 0 0 # / was on /dev/sda6 during installation UUID=3219d03a-67e4-454b-8ce7-a27831846e35 / ext4 errors=remount-ro 0 1 # swap was on /dev/sda5 during installation UUID=2ea7d608-2d89-4e41-9436-d05cb3ce8871 none swap sw 0 0 free -m total used free shared buffers cached Mem: 991 867 123 0 27 418 -/+ buffers/cache: 421 569 Swap: 0 0 0 cat /proc/swaps Filename Type Size Used Priority fdisk -l Disk /dev/sda: 160.0 GB, 160041885696 bytes 255 heads, 63 sectors/track, 19457 cylinders, total 312581808 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x9f369f36 Device Boot Start End Blocks Id System /dev/sda1 * 63 31471334 15735636 7 HPFS/NTFS/exFAT /dev/sda2 31471616 33470447 999416 82 Linux swap / Solaris /dev/sda3 33472512 62539775 14533632 83 Linux /dev/sda4 62541045 312592769 125025862+ f W95 Ext'd (LBA) /dev/sda5 62541108 125066024 31262458+ 7 HPFS/NTFS/exFAT /dev/sda6 125066088 187591004 31262458+ 7 HPFS/NTFS/exFAT /dev/sda7 187591068 250115984 31262458+ 7 HPFS/NTFS/exFAT /dev/sda8 250116048 312576704 31230328+ 7 HPFS/NTFS/exFAT swapon --all swapon: /dev/sda2: swapon failed: Invalid argument dmesg | grep -A 5 -B 5 -i swap [ 9.487404] EXT4-fs (sda3): ext4_orphan_cleanup: deleting unreferenced inode 131645 [ 9.487413] EXT4-fs (sda3): ext4_orphan_cleanup: deleting unreferenced inode 131330 [ 9.487418] EXT4-fs (sda3): 16 orphan inodes deleted [ 9.487420] EXT4-fs (sda3): recovery complete [ 9.578600] EXT4-fs (sda3): mounted filesystem with ordered data mode. Opts: (null) [ 20.580539] Swap area shorter than signature indicates [ 20.588363] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready [ 20.619443] udevd[330]: starting version 175 [ 20.649959] lp: driver loaded but no devices found [ 20.662972] [drm] Initialized drm 1.1.0 20060810 [ 20.675515] i915 0000:00:02.0: setting latency timer to 64 -- [ 72.288573] PM: thaw of drv:sr dev:3:0:0:0 complete after 178.143 msecs [ 72.288578] PM: thaw of drv:scsi_device dev:3:0:0:0 complete after 178.136 msecs [ 72.299677] PM: thaw of drv:scsi_device dev:2:0:0:0 complete after 189.270 msecs [ 72.309473] PM: thaw of devices complete after 202.763 msecs [ 72.309668] PM: writing image. [ 72.309670] PM: Cannot find swap device, try swapon -a. [ 72.309699] PM: Cannot get swap writer [ 72.329896] Restarting tasks ... done. [ 72.331777] PM: Basic memory bitmaps freed [ 72.331792] video LNXVIDEO:00: Restoring backlight state [ 72.420048] option1 ttyUSB0: option_instat_callback: error -84 [ 72.804047] option1 ttyUSB0: option_instat_callback: error -84 -- [ 145.960625] sd 7:0:0:0: Attached scsi generic sg2 type 0 [ 145.972036] sd 7:0:0:0: [sdb] Attached SCSI removable disk [ 172.430508] PPP BSD Compression module registered [ 172.455583] PPP Deflate Compression module registered [ 332.260789] type=1400 audit(1381814763.342:27): apparmor="DENIED" operation="capable" parent=1 profile="/usr/sbin/cupsd" pid=636 comm="cupsd" pid=636 comm="cupsd" capability=36 capname="block_suspend" [ 1913.030998] Swap area shorter than signature indicates [ 2022.530155] type=1400 audit(1381816453.610:28): apparmor="DENIED" operation="capable" parent=1 profile="/usr/sbin/cupsd" pid=636 comm="cupsd" pid=636 comm="cupsd" capability=36 capname="block_suspend" [ 4062.729509] Swap area shorter than signature indicates Please help. Thanks in advance. df -h Filesystem Size Used Avail Use% Mounted on /dev/sda3 14G 6.1G 7.0G 47% / udev 488M 4.0K 488M 1% /dev tmpfs 199M 868K 198M 1% /run none 5.0M 4.0K 5.0M 1% /run/lock none 496M 224K 496M 1% /run/shm

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• what differs a computer scientist/software engineer to regular people who learn programming language and APIs?

  - by Amumu

  In University, we learn and reinvent the wheel a lot to truly learn the programming concepts. For example, we may learn assembly language to understand, what happens inside the box, and how the system operates, when we execute our code. This helps understanding higher level concepts deeper. For example, memory management like in C is just an abstraction of manually managed memory contents and addresses. The problem is, when we're going to work, usually productivity is required more. I could program my own containers, or string class, or date/time (using POSIX with C system call) to do the job, but then, it would take much longer time to use existing STL or Boost library, which abstract all of those thing and very easy to use. This leads to an issue, that a regular person doesn't need to get through all the low level/under the hood stuffs, who learns only one programming language and using language-related APIs. These people may eventually compete with the mainstream graduates from computer science or software engineer and call themselves programmers. At first, I don't think it's valid to call them programmers. I used to think, a real programmer needs to understand the computer deeply (but not at the electronic level). But then I changed my mind. After all, they get the job done and satisfy all the test criteria (logic, performance, security...), and in business environment, who cares if you're an expert and understand how computer works or not. You may get behind the "amateurs" if you spend to much time learning about how things work inside. It is totally valid for those people to call themselves programmers. This makes me confuse. So, after all, programming should be considered an universal skill? Does programming language and concepts matter or the problems we solve matter? For example, many C/C++ vs Java and other high level language, one of the main reason is because C/C++ features performance, as well as accessing low level facility. One of the main reason (in my opinion), is coding in C/C++ seems complex, so people feel good about it (not trolling anyone, just my observation, and my experience as well. Try to google "C hacker syndrome"). While Java on the other hand, made for simplifying programming tasks to help developers concentrate on solving their problems. Based on Java rationale, if the programing language keeps evolve, one day everyone can map their logic directly with natural language. Everyone can program. On that day, maybe real programmers are mathematicians, who could perform most complex logic (including business logic and academic logic) without worrying about installing/configuring compiler, IDEs? What's our job as a computer scientist/software engineer? To solve computer specific problems or to solve problems in general? For example, take a look at this exame: http://cm.baylor.edu/ICPCWiki/attach/Problem%20Resources/2010WorldFinalProblemSet.pdf . The example requires only basic knowledge about the programming language, but focus more on problem solving with the language. In sum, what differs a computer scientist/software engineer to regular people who learn programming language and APIs? A mathematician can be considered a programmer, if he is good enough to use programming language to implement his formula. Can we programmer do this? Probably not for most of us, since we specialize about computer, not math. An electronic engineer, who learns how to use C to program for his devices, can be considered a programmer. If the programming languages keep being simplified, may one day the software engineers, who implements business logic and create softwares, be obsolete? (Not for computer scientist though, since many of the CS topics are scientific, and science won't change, but technology will).

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