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  • why do i see THROW in a C library

    - by Bhagya
    When I do: less /usr/include/stdio.h (which is only a C library - nothing to do with C++) I see __THROW after quite a few function declarations. Also, comments above a few functions say that 'This function is a possible cancellation point and therefore not marked with __THROW' What is all this for? THROW is meant to be for exception handling.. but as far as I know, C doesn't provide any support for it... Plz explain.

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  • What Does an OS Actually Do?

    - by Ell
    What exactly does an operating system do? I know that operating systems can be programmed, in, for example, C++, but I previously believed that C++ programs must be run under an operating system? Can somebody please explain and give links? thanks in advance, ell

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  • ajax/JS timed countdown?

    - by kieran
    Let me explain what I'm trying to do. I want to make a simple box which counts down numbers at intervals I specify. For example, I'd like to set it to start at 150, and then I want to set it to drop by 15 every 30 seconds. Is this possible with AJAX/Javascript? If so, could someone point me in the right direction? Would really appreciate any help on this script, been Googling for hours now! :( Cheers Kieran

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  • street light and shadow in opengl ?

    - by Abhilash M
    To make a scene street illuminated, i tried, point source light, used glMaterial and used ambient light...... I get a scene fully illuminated, not exactly the way like street light, can anyone share resources or explain how exactly i can achieve this?? I went through many light resources in net, could not properly understand....

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  • Setup Turtoise SVN+SubWeaver for existing dreamweaver site?

    - by John Isaacks
    I installed both Turtoise SVN and SubWeaver, I now have a SubWeaver drop down menu on the top of dreamweaver. I read a lot of the help files which basically explains how the system works and explains Copy-Modify-Merge. I am trying to set this up for my already existing dreamweaver site though, I am not finding information on how to do that. Can anyone explain this to me? Thanks!

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  • ALTER TABLE error

    - by Travis
    Can someone explain to me why I am receiving the following error? I want to rename the column "exerciseID" to "ID" in a mysql table using the following syntax. ALTER TABLE `exercises` CHANGE `exerciseID` `ID` INT( 11 ) NOT NULL AUTO_INCREMENT However I receive the following error: MySQL said: #1025 - Error on rename of './balance/#sql-de_110e' to './balance/exercises' (errno: 150) Any suggestions would be much appreciated

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  • iPhone "touchesBegan" and "touchesMoved" message ... do not move to centre of touch

    - by Nippysaurus
    I am modifying the "MoveMe" example from the apple web site. When I get the "touchesMoved" message I move the centre of the target view to the centre of the touch. Is there a way that when the touch starts ("touchesBegan" message) I can remember the offset from the target view and keep that offset. Let me know if this is hard to understand and I will try to explain it a bit better.

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  • Is this a Java DateFormat bug?

    - by anonymous
    The pattern is "dd-MM-yyyy" I think the string "01-01-2010mwwwwwwwwwwwwwww" does not satisfy the pattern, but the following code shows the contrary. Anyone can explain why? public static void main(String[] args) throws Exception { SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy"); Date date = df.parse("01-01-2010mwwwwwwwwwwwwwww"); System.out.println(date); } Thanks

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  • 10 gigabit or 1 gigabit switch

    - by Guntis
    We are planning to move mysql to dedicated box. At this moment we have web servers and mysql is running on each. Question is: cheaper is to buy 10G switch and put 10G network card into mysql server. Or buy normal gigabit switch and connect mysql box to switch with multiple network cables. In 1G scenario then we give each web server different mysql IP address. I don't think, that mysql box with one 1G link is enough to to satisfy multiple web box mysql traffic. At this moment we have 3 servers witch are running mysql/web. Plan is to add fourth server for mysql only. Thanks. Edit: if we buy 1G switch with mini-GBIC ports. Can we put in mini-GBIC 10G connectors and then connect mysql box to that port?

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  • Apache configuration: choose a site to display according to visitor's IP address

    - by user64294
    Hi all. I would like to set a special configuration in our apache web server. I would like to display sites to the users according their IP addresses. We plan to upgrade our web sites. During the upgrade we'll put a maintenance site: so all the users which will connect to our web sites will get this site. but in order to test the upgrade i need to set apache to let only my IP address to access to asked site. If my IP address is a.b.c.d and if i ask for test_dot_com i want to see it. but all other users, having a different IP address, should get the maintenane site even if they look for test_dot_com. Is there a way to do this? PS: sorry As i'm a new user i can't use more than one link. so test_dot_com = test.com Thank you.

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  • What does this eclipse symbol mean?

    - by ikky
    Hi, i can't seem to find this symbol in the Eclipse documentation, and i'm no expert in using Eclipse. Can anyone explain to me what it means? The symbol: It's the arrow that confuses me. Can it be a shared resource? Thanks in advance!

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  • C: do {...} while(0)?

    - by igul222
    I'm working on some C code filled with macros like this: #define SAFE_FREE(x) do { if ((x) != NULL) {free(x); x=NULL;} } while(0) Can anyone explain what this macro does, and why do {} while(0) is needed? Wouldn't that just execute the code once?

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  • error while adding web service to server in website panel

    - by sam
    I got following error while creating website for user in website panel.I am not able to create any hosting space in server's hosting plan it is showing 0 mb space. Stack Trace: [SoapException: System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.UriFormatException: Invalid URI: The Authority/Host could not be parsed. at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind) at System.Uri..ctor(String uriString) at Microsoft.Web.Services3.WebServicesClientProtocol.set_Url(String value) at WebsitePanel.Server.Client.ServerProxyConfigurator.Configure(WebServicesClientProtocol proxy) at WebsitePanel.EnterpriseServer.ServiceProviderProxy.ServerInit(WebServicesClientProtocol proxy, ServerProxyConfigurator cnfg, String serverUrl, String serverPassword) at WebsitePanel.EnterpriseServer.ServiceProviderProxy.ServerInit(WebServicesClientProtocol proxy, ServerProxyConfigurator cnfg, Int32 serverId) at WebsitePanel.EnterpriseServer.ServiceProviderProxy.Init(WebServicesClientProtocol proxy, Int32 serviceId) at WebsitePanel.EnterpriseServer.WebAppGalleryController.InitFeedsByServiceId(Int32 UserId, Int32 serviceId) at WebsitePanel.EnterpriseServer.esWebApplicationGallery.GetGalleryApplicationsByServiceId(Int32 serviceId) --- End of inner exception stack trace ---] System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall) +1485877 System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters) +221 WebsitePanel.EnterpriseServer.esWebApplicationGallery.GetGalleryApplicationsByServiceId(Int32 serviceId) +68 WebsitePanel.Portal.WebAppGalleryHelpers.GetGalleryApplicationsByServiceId(Int32 serviceId) +31 can anybody help me in this.

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  • Are periodic full backups really necessary on an incremental backup setup?

    - by user2229980
    I intend to use an old computer I have as a remote backup server for myself and a few other people. We are all geographically separated, and the plan is to do incremental daily backups using rsync and ssh. My original idea was to make one initial full backup then never again have to deal with the overhead of doing it, and from that moment on only copy the files changed since the last backup. I've been told that this could be bad, but I fail to understand why. Since each snapshot is comprised of hard links to the unchanged files plus the original changed ones, isn't it going to be identical to a new full backup? Why would I want to make another full backup?

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  • I can't find my custom TextBox control in Visual Studio

    - by Gold
    Hi, I'm creating a custom WinForms TextBox control, like this: class MyTest : TextBox { protected override void OnEnter(EventArgs e) { this.BackColor = Color.Yellow; } protected override void OnLeave(EventArgs e) { this.BackColor = Color.White; } } When I build the project, I cannot see the control. Can anyone explain why not? Thanks in advance.

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  • Closure Tables - Is this enough data to display a tree view?

    - by James Pitt
    Here is the table I have created by testing the closure table method. | id | parentId | childId | hops | | | | | 270 | 6 | 6 | 0 | 271 | 7 | 7 | 0 | 272 | 8 | 8 | 0 | 273 | 9 | 9 | 0 | 276 | 10 | 10 | 0 | 281 | 9 | 10 | 1 | 282 | 7 | 9 | 1 | 283 | 7 | 10 | 2 | 285 | 7 | 8 | 1 | 286 | 6 | 7 | 1 | 287 | 6 | 9 | 2 | 288 | 6 | 10 | 3 | 289 | 6 | 8 | 2 | 293 | 6 | 9 | 1 | 294 | 6 | 10 | 2 I am trying to create a simple tree of this using PHP. There does not seem to be enough data to create the table. For example, when I look purely at parentId = 6: -Part 6 -Part 7 - ? - ? -Part 9 - ? - ? We know that parts 8 and 10 exists below Part 7 or 9, but not which. We know that part 10 exists at both 3 and 4 nodes deep but where? If I look at other data in the table it is possible to tell it should be: - Part 6 - Part 7 - Part 9 - Part 10 - Part 9 - Part 10 I thought one of the benefits of closure tables was there was no need for recursive queries? Could you help explain what I am doing wrong? EDIT: For clarification, this is a mapping table. There is another table called "parts" which has a column called part_id that correlates to both the parentId and childId columns in the "closure" table. The "id" column in the table above (closure) is just for the purposes of maintaining a primary key. It is not really necessary. The methods I have used to create this closure table is described in the following article: http://dirtsimple.org/2010/11/simplest-way-to-do-tree-based-queries.html EDIT2: It can have two and three hops. I will explain easier by assigning names to the items. Part 6 = Bicycle Part 7 = Gears Part 8 = Chain Part 9 = Bolt Part 10 = Nut Nut is part of Bolt. The Bolt and Nut combo exists directly within Bicycle and within Gears which is part of Bicycle. In relation to what method to use I have looked at Adjacency, Edges, Enum Paths, Closures, DAGS(networks) and the Nested Set Model. I am still trying to work out what is what, but this is an extremely complex component database where there are multiple parents and any modification to a sub-tree must propogate through the other trees. More importantly there will be insertions, deletions and tree views that I wish to avoid recursion during general use, even at the cost of database space and query time during entry.

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  • What is meant by porting an application X to a platform Y ?

    - by Neeraj
    Pretty clear from the title itself, what is meant by porting an application X to a platform Y? Say for example I have an application X running on some OS, say Y, What do I do to port this application to another OS say Z? Does this mean rewriting a new application A for Operating system Z that necessarily imitates the behavior of application X on Operating System Y. Please explain.

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  • Why does the task name contain "now / 30"?

    - by Jaroslav Záruba
    In the video/PDF from "Data pipelines with Google App Engine" Brett puts "now / 30" into the task name noting that he will explain the reason later, but somehow he never does. :) http://www.youtube.com/watch?v=zSDC_TU7rtc#t=41m35 task_name = '%s-%d-%d' % (sum_name, int(now / 30), index) Do you have any idea about the reason? Does it have anything to do with the 7 day period in which one can't re-use task names? URL to the session page: http://tinyurl.com/3523mej

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