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  • crude Runtime.exec to call java -cp not working in linux

    - by pstanton
    I'm using a java process to spawn many other java processes using Runtime.exec(cmd) where cmd is like the following: java -cp "MyJar.jar" pkg.MyClass some-more-arguments running the same command from the command line works fine in windows and linux, however when my spawning java process calls the command via Runtime.exec it works in windows but not in linux. in linux i get Exception in thread "main" java.lang.NoClassDefFoundError: pkg/MyClass any ideas?

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  • getting the list of all functions executed like call stack in asp.net

    - by sridhar
    Hi, I am having trouble with debugging one of the problems that I am having in our website. This is the problem. I have a webpage that contains the photo of an employee and information related to the employee. When the user logins to our website, we are storing the details of the employee in session. I am setting the image url for the photo of an employee as follows. imgEEPhoto.ImageUrl = imgPhoto.aspx?Company=XXXX&Empno=YYYY. Inside the page imgPhoto.aspx, I am checking if the session is alive for that user. when I login to the page that has the employee photo sometimes the photo is not displayed. It is because I am checking whether the session is alive inside the imgPhoto.aspx page. sometimes the session is alive and sometimes the session is not alive. It looks like there is some function that is setting the session to null asynchronously. I am not knowing how to track that function. so I am thinking that inside the imgPhoto.aspx page, if I can get the list of all functions that have been executed so far, I could track the function that is resetting the session. Is there a way to find this? If there is no another way to debug this problem, please let me know. Thanks, sridhar.

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  • Continuation (call/cc) in Scheme

    - by darkie15
    Hi All, I need to understand Continuations in Scheme for my upcoming exams and I have no idea about continuations at all. Can anyone please suggest me sources of how to go about learning continuations? Regards, darkie

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  • Call pushview from a subview

    - by slaapwagen
    Hello everyone, Here is the thing. I currently have a tabBar controller, with several navigation controllers in it. Just like this : http://tof.canardpc.com/view/d27d1361-c81b-43a0-9b5b-abb13d78e422.jpg In my first navigation controller, i have a view controller called NewsViewsController. Here is its nib (see picture). My goal is to show/hide the subviews (with tableview inside) according to the position of the segmented control. This way, I can have two separates viewControllers for each tableview. This is actually working. And here is the result (see picture). My problem is the following one. When i try to click on a cell, the pushview doesn't work. Indeed my self.navigationController is null. How can i push my detail view using the parent navigation controller ? Is the architecture of my application wrong ? Thank you =)

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  • ASP.NET MVC - PartialView html not changing via jQuery html() call

    - by Bryan Roth
    When I change the selection in a DropDownList, a PartialView gets updated via a GET request. When updating the PartialView via the jQuery html() function, the html returned is correct but when it displayed in the browser it is not correct. For example, certain checkboxes within the PartialView should become enabled but they remain disabled even though the html returned says they should be. When I do a view source in the browser the html never gets updated. I'm a little perplexed. Thoughts? Search.aspx <%@ Page Title="" Language="VB" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage" %> <asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server"> Search </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <script type="text/javascript"> $(document).ready(function () { $("#Sections").change(function () { var section = $("#Sections").val(); var township = $("#Townships").val(); var range = $("#Ranges").val(); $.get("Search/Search?section=" + section + "&township=" + township + "&range=" + range, function (response) { $("#cornerDiv").html(response) }); }); }); </script> <h2>Search</h2> <%--The line below is a workaround for a VB / ASPX designer bug--%> <%=""%> <% Using Ajax.BeginForm("Search", New AjaxOptions With {.UpdateTargetId = "searchResults", .LoadingElementId = "loader"})%> Township <%= Html.DropDownList("Townships")%> Range <%= Html.DropDownList("Ranges")%> Section <%= Html.DropDownList("Sections")%> <div id="cornerDiv"> <% Html.RenderPartial("Corners")%> </div> <input type="submit" value="Search" /> <span id="loader">Searching...</span> <% End Using%> <div id="searchResults"></div> </asp:Content>

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  • Perl open call failing.

    - by benjamin button
    I am new to perl coding. I am facing a problem while executing a small script i have: open is not able to find the file which i am giving as an argument.Please see below: File is available: ls -l DLmissing_months.sql -rwxr-xr-x 1 tlmwrk61 aimsys 2842 May 16 09:44 DLmissing_months.sql My perl script: #!/usr/local/bin/perl use strict; use warnings; my $this_line = ""; my $do_next = 0; my $file_name = $ARGV[0]; open( my $fh, '<', '$file_name') or die "Error opening file - $!\n"; close($fh); executing the perl script : > new.pl DLmissing_months.sql Error opening file - No such file or directory what is the problem with my perl script.

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  • Grails - Recursive computing call "StackOverflowError" and don't update on show

    - by Kedare
    Hello, I have a little problem, I have made a Category domain on Grails, but I want to "cache" the string representation on the database by generating it when the representation field is empty or NULL (to avoid recursive queries at each toString), here is the code : package devkedare class Category { String title; String description; String representation; Date dateCreated; Date lastUpdate; Category parent; static constraints = { title(blank:false, nullable:false, size:2..100); description(blank:true, nullable:false); dateCreated(nullable:true); lastUpdate(nullable:true); autoTimestamp: true; } static hasMany = [childs:Category] @Override String toString() { if((!this.representation) || (this.representation == "")) { this.computeRepresentation(true) } return this.representation; } String computeRepresentation(boolean updateChilds) { if(updateChilds) { for(child in this.childs) { child.representation = child.computeRepresentation(true); } } if(this.parent) { this.representation = "${this.parent.computeRepresentation(false)}/${this.title}"; } else { this.representation = this.title } return this.representation; } void beforeUpdate() { this.computeRepresentation(true); } } There is 2 problems : It don't update the representation when the representation if NULL or empty and toString id called, it only update it on save, how to fix that ? On some category, updating it throw a StackOverflowError, here is an example of my actual category table as CSV : Uploaded the csv file here, pasting csv looks buggy: http://kedare.free.fr/Dist/01.csv Updating the representation works everywhere except on "IT" that throw a StackOverlowError (this is the only category that has many childs). Any idea of how can I fix those 2 problems ? Thank you !

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  • Parse XML function names and call within whole assembly

    - by Matt Clarkson
    Hello all, I have written an application that unit tests our hardware via a internet browser. I have command classes in the assembly that are a wrapper around individual web browser actions such as ticking a checkbox, selecting from a dropdown box as such: BasicConfigurationCommands EventConfigurationCommands StabilizationCommands and a set of test classes, that use the command classes to perform scripted tests: ConfigurationTests StabilizationTests These are then invoked via the GUI to run prescripted tests by our QA team. However, as the firmware is changed quite quickly between the releases it would be great if a developer could write an XML file that could invoke either the tests or the commands: <?xml version="1.0" encoding="UTF-8" ?> <testsuite> <StabilizationTests> <StressTest repetition="10" /> </StabilizationTests> <BasicConfigurationCommands> <SelectConfig number="2" /> <ChangeConfigProperties name="Weeeeee" timeOut="15000" delay="1000"/> <ApplyConfig /> </BasicConfigurationCommands> </testsuite> I have been looking at the System.Reflection class and have seen examples using GetMethod and then Invoke. This requires me to create the class object at compile time and I would like to do all of this at runtime. I would need to scan the whole assembly for the class name and then scan for the method within the class. This seems a large solution, so any information pointing me (and future readers of this post) towards an answer would be great! Thanks for reading, Matt

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  • How can I call a function at the very end of document.ready

    - by Umair
    I have multiple document.ready functions on a page and I want a function to be called when all my document.ready functions have been executed. I simply want the function to be called at the very end, after all other document.ready functions have executed. An example of this could be that each document.ready function increments a global variable when it has been executed, and the last function needs to check the value of that variable at the very end. Any ideas ?

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  • How to call a scalar function in a stored procedure

    - by Luke101
    I am wacking y head over the problem with this code. DECLARE @root hierarchyid declare @lastchild hierarchyid SELECT @root = NodeHierarchyID from NodeHierarchy where ID = 1 set @lastchild = getlastchild(@root) it says it does not recognize getlastchild function. What am I doing wrong here

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  • WCF contracts - namespaces and SerializationExceptions

    - by qntmfred
    I am using a third party web service that offers the following calls and responses http://api.athirdparty.com/rest/foo?apikey=1234 <response> <foo>this is a foo</foo> </response> and http://api.athirdparty.com/rest/bar?apikey=1234 <response> <bar>this is a bar</bar> </response> This is the contract and supporting types I wrote [ServiceContract] [XmlSerializerFormat] public interface IFooBarService { [OperationContract] [WebGet( BodyStyle = WebMessageBodyStyle.Bare, ResponseFormat = WebMessageFormat.Xml, UriTemplate = "foo?key={apikey}")] FooResponse GetFoo(string apikey); [OperationContract] [WebGet( BodyStyle = WebMessageBodyStyle.Bare, ResponseFormat = WebMessageFormat.Xml, UriTemplate = "bar?key={apikey}")] BarResponse GetBar(string apikey); } [XmlRoot("response")] public class FooResponse { [XmlElement("foo")] public string Foo { get; set; } } [XmlRoot("response")] public class BarResponse { [XmlElement("bar")] public string Bar { get; set; } } and then my client looks like this static void Main(string[] args) { using (WebChannelFactory<IFooBarService> cf = new WebChannelFactory<IFooBarService>("thirdparty")) { var channel = cf.CreateChannel(); FooResponse result = channel.GetFoo("1234"); } } When I run this I get the following exception Unable to deserialize XML body with root name 'response' and root namespace '' (for operation 'GetFoo' and contract ('IFooBarService', 'http://tempuri.org/')) using XmlSerializer. Ensure that the type corresponding to the XML is added to the known types collection of the service. If I comment out the GetBar operation from IFooBarService, it works fine. I know I'm missing an important concept here - just don't know quite what to look for. What is the proper way to construct my contract types, so that they can be properly deserialized?

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  • how to call the methos

    - by vicky
    for (i = 0; i < 4; i++) { DeCheBX = $('MyDiv').insert(new Element('input', { 'type': 'checkbox', 'id': "Img" + obj[i].Nam, 'value': obj[i].IM, 'onClick': 'shohide()' })); document.body.appendChild(DeCheBX); DeImg = $('MyDiv').insert(new Element('img', { 'id': "Imgx" + obj[i].Nam, 'src': obj[i].IM })); document.body.appendChild(DeImg); } function shohide() { for (i = 0; i < 4; i++) { ($('Img' + obj[i].Nam).checked == true) { alert("press" + obj[i].Nam); } } }

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  • Navigation to call action for bean class

    - by Muthu
    I am using JSF 2.0 and PrimeFaces 3.0. I have uploaded the images and have to crop the image. The images are uploaded and successfully displayed in the upload pages. When I select the images and click the crop button the corresponding crop bean is not called. If I don't select the image and click the crop button the corresponding crop bean class is called but a NullPointerException occurred. What is the problem? The Facelet view is: <h:form> <p:panel header="FILE UPLOAD WITH CROPPER" style="width:900px; margin: 0 auto; margin-top:0px"> <p:fileUpload fileUploadListener="#{photoUploadAction.handleImageUpload}" mode="advanced" update="getImageId,messages" auto="false" allowTypes="/(\.|\/)(gif|jpe?g|png)$/"/> <p:growl id="messages" showDetail="true"/> <p:growl id="uploadMessages" showSummary="true" showDetail="true"/> <h:panelGrid columns="2" > <p:imageCropper value="#{photoUploadAction.croppedImage}" id="getImageId" image="images/#{photoUploadVO.imageName}"/> </h:panelGrid> <p:commandButton value="Crop" update="getImageId" action="#{imageCropperBean.crop}" /> </p:panel> </h:form> BACKING BEAN for ImageCropper: @ManagedBean(name="imageCrop") @RequestScoped public class ImageCropperBean { private CroppedImage croppedImage; private String newFileName; private String imageName; public String getImageName() { return imageName; } public void setImageName(String imageName) { System.out.println("TEH IMAGE NAME ===="+imageName); this.imageName = imageName; } public String getNewFileName() { return newFileName; } public void setNewFileName(String newFileName) { System.out.println("AAAAAAAAAAAAAA"+this.newFileName); this.newFileName = newFileName; } public CroppedImage getCroppedImage() { return croppedImage; } public void setCroppedImage(CroppedImage croppedImage) { System.out.println("cRRRRRRRRRRRRR"+croppedImage); this.croppedImage = croppedImage; } public ImageCropperBean(){ } public String crop() { System.out.println("WELCOMEMMMMMMMMMMMMMM"); FacesContext context = FacesContext.getCurrentInstance(); ImageCropperBean imageCropperBean = (ImageCropperBean) context.getApplication().evaluateExpressionGet(context, "#{imageCropperBean}", ImageCropperBean.class); ServletContext servletContext = (ServletContext) FacesContext.getCurrentInstance().getExternalContext().getContext(); newFileName = servletContext.getRealPath("") + File.separator + "cropImage" + File.separator+ "croppedImage.jpg"; System.out.println("FILE NAME NAME NAME NAME "+newFileName); String file = new File(newFileName).getName(); System.out.println("DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD"+file); imageCropperBean.setImageName(file); File fileFolder = new File("e:/Mecherie_project/image_web/WebContent/cropImages",file); System.out.println("FILE ANE"+file); // String target=null; FileImageOutputStream imageOutput; try { imageOutput = new FileImageOutputStream(fileFolder); System.out.println("HHHHHHHHHH=="+imageOutput); imageOutput.write(croppedImage.getBytes(), 0, croppedImage.getBytes().length); imageOutput.close(); FacesMessage msg = new FacesMessage("Succesful", file + " is cropped."); FacesContext.getCurrentInstance().addMessage(null, msg); } catch (FileNotFoundException e) { FacesMessage error = new FacesMessage(FacesMessage.SEVERITY_ERROR, "The files were not Cropped!", ""); FacesContext.getCurrentInstance().addMessage(null, error); e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); FacesMessage error = new FacesMessage(FacesMessage.SEVERITY_ERROR, "The files were not Cropped!", ""); FacesContext.getCurrentInstance().addMessage(null, error); } // System.out.println("ghfhgfghgh"+target); return "success"; } }

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  • javascript textbox call event when value changes

    - by Senica Gonzalez
    I have a textbox, and whenever the value of the box changes, I want to check and see if 20 digits have been entered. I thought that I would use the onChange event, but this seems to be interpreted as the onBlur event on IE. So then I thought I would use onKeyDown, but the problem comes in if the user wants to paste a value into the field, then the function never gets called. There are no other form boxes so I can't rely on onBlur or expect that they will change focus ever. How do I do this? I just want to evaluate the value of the textbox everytime the value of the textbox changes. <input type="text" onKeyDown="myfunction()">

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  • Objectiveflickr set properties, more than one call

    - by user295944
    I cant to set Meta and set Location in ObjectiveFlickr if I do only one it works fine, but if I do both it only does the first one - (void)flickrAPIRequest:(OFFlickrAPIRequest *)inRequest didCompleteWithResponse:(NSDictionary *)inResponseDictionary { NSLog(@"%s %@ %@", PRETTY_FUNCTION, inRequest.sessionInfo, inResponseDictionary); if (inRequest.sessionInfo == kUploadImageStep) { snapPictureDescriptionLabel.text = @"Setting properties..."; NSLog(@"%@", inResponseDictionary); NSString *photoID = [[inResponseDictionary valueForKeyPath:@"photoid"] textContent]; flickrRequest.sessionInfo = kSetImagePropertiesStep; [flickrRequest callAPIMethodWithPOST:@"flickr.photos.setMeta" arguments:[NSDictionary dictionaryWithObjectsAndKeys:photoID, @"photo_id", @"Snap and Run", @"title", @"Uploaded from my iPhone/iPod Touch", @"description", nil]]; flickrRequest.sessionInfo = kSetImagePropertiesStep; [flickrRequest callAPIMethodWithPOST:@"flickr.photos.geo.setLocation" arguments:[NSDictionary dictionaryWithObjectsAndKeys:photoID, @"photo_id",@"34" ,@"lat",@"-118",@"lon", nil]]; } else if (inRequest.sessionInfo == kSetImagePropertiesStep) { [self updateUserInterface:nil]; snapPictureDescriptionLabel.text = @"Done"; [UIApplication sharedApplication].idleTimerDisabled = NO; } }

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  • MVC2 Client Validation isn't working when getting form from ajax call

    - by devlife
    I'm trying to use MVC2 client-side validation in a partial view that is rendered via $.get. However, the client validation isn't working. I'm not quite sure what the deal is. [Required(ErrorMessage = "Email is required")] public string Email { get; set; } <% using ( Ajax.BeginForm( new AjaxOptions { Confirm = "You sure?" } ) ) { %> <%: Html.TextBoxFor( m => m.Email, new { @class = "TextBox150" } )%> <%= Html.ValidationMessageFor( m => m.Email )%> <input type="submit" value="Add/Save" style="float: right;" /> <% } %> I'm not doing anything special to render the the partial view. Just putting the html into a div and showing it in a modal popup. On a side note, does anyone know if it's possible to submit the form with client validation without a submit button?

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  • Client Web Service call over SSL using Apache Axis

    - by java_pill
    I'm using Apache Axis 1.5.1 to code a web service client connecting to a service over SSL. My application is running in Tomcat with SSL configuration setup in JKS. However, when I connect to the server, the connection is failing because the cert from our client is not being sent to the server. Is this something that has to be set in the client through code? Also note that the server does not need any user name or password authentication. With SSL turned off, everything works fine. Thanks,

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  • how to call sql string from nhibernate

    - by frosty
    i have the following method, at the moment it's return the whole sql string. How would i execute the following. using (ITransaction transaction = session.BeginTransaction()) { string sql = string.Format( @"DECLARE @Cost money SET @Cost = -1 select @Cost = MAX(Cost) from item_costings where Item_ID = {0} and {1} >= Qty1 and {1} <= Qty2 RETURN (@Cost)", itemId, quantity); string mystring = session .CreateSQLQuery(sql) .ToString(); transaction.Commit(); return mystring; } // EDIT here is the final version using criteria using (ISession session = NHibernateHelper.OpenSession()) { decimal cost = session .CreateCriteria(typeof (ItemCosting)) .SetProjection(Projections.Max("Cost")) .Add(Restrictions.Eq("ItemId", itemId)) .Add(Restrictions.Le("Qty1", quantity)) .Add(Restrictions.Ge("Qty2", quantity)) .UniqueResult<decimal>(); return cost; }

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  • Usability: call for action

    - by Shyam
    I am designing a page, with tiny portlets. Now, I personally like my actions on the right side, yet I wonder if there are methodologies that are targeted about usability. After all, most applications are aimed at the user. What about yourself? Do you prefer information to be on top, on the left or on the right? I've you need to take some sort of action, do you prefer buttons on the left? References to good books and webpages are very welcome!

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  • Silverlight and WCF Ria Services

    - by Flex_Addicted
    Hi guys, I've created a new Silverlight 3 Business Application with VS 2008. The creation has completed correctly. When I try to open the xaml, it opens but in meanwhile this error is shown: Failed to load metadata assembly System.Windows.Controls.Data.Input.Design, Version=2.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35. Exception message: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.. Stack Trace: at System.Reflection.Module._GetTypesInternal(StackCrawlMark& stackMark) at System.Reflection.Assembly.GetTypes() at MS.Internal.Package.MetadataLoader.RegisterDesignTimeMetadata(Assembly assembly, LogCallback logger)An exception of type ArgumentNullException was caught when calling IRegisterMetadata on type System.Windows.Controls.Data.Input.VisualStudio.Design.MetadataRegistration. Exception Message: Value cannot be null. Parameter name: type. Stack Trace: at Microsoft.Windows.Design.Metadata.AttributeTableBuilder.AddCallback(Type type, AttributeCallback callback) at System.Windows.Controls.Data.Input.VisualStudio.Design.MetadataRegistration.AddAttributes(AttributeTableBuilder builder) at System.Windows.Controls.Design.Common.MetadataRegistrationBase.BuildAttributeTable() at System.Windows.Controls.Data.Input.VisualStudio.Design.MetadataRegistration.Register() at MS.Internal.Package.MetadataLoader.RegisterDesignTimeMetadata(Assembly assembly, LogCallback logger)Failed to load metadata assembly System.Windows.Controls.Design, Version=2.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35. Exception message: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.. Stack Trace: at System.Reflection.Module._GetTypesInternal(StackCrawlMark& stackMark) at System.Reflection.Assembly.GetTypes() at MS.Internal.Package.MetadataLoader.RegisterDesignTimeMetadata(Assembly assembly, LogCallback logger)Failed to load metadata assembly System.Windows.Controls.Navigation.Design, Version=2.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35. Exception message: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.. Stack Trace: at System.Reflection.Module._GetTypesInternal(StackCrawlMark& stackMark) at System.Reflection.Assembly.GetTypes() at MS.Internal.Package.MetadataLoader.RegisterDesignTimeMetadata(Assembly assembly, LogCallback logger) Why? Any solutions? Thank you in advance.

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  • Call to C++ COM interface from C# being blocked

    - by dauphic
    I have a C++ DLL that exposes a COM interface. A C# application uses the COM interface. I've recently run into a problem where some calls to the COM interface are taking 500-5000 ms to return, though they should return almost instantly (no longer than 10 ms). Profiling the application shows that all of the delay is being caused by the 'thread being blocked;' no other information is available. There are no locks, etc. in my code, so the blocking has to be occurring internally in the COM/interop code. Only one thread interfaces with the COM DLL. Any ideas what could be causing this, and how I would fix it? EDIT: Further investigation shows that the block is occuring when the C++ returns to the C#.

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  • jQuery plugin Breaks after ajax call

    - by Jason
    Hello, I am quite a newbie to jQuery/ajax but am having a problem with my site that im making. Basically at first the page loads fine. On the boxes is a fade caption, when the title of the caption is clicked you are brought to an ajax page. Once you use the 'Back' button on browser, or the 'Back to list' button i've made the caption fade plugin no longer works and the box i had previously clicked is no longer clickable. can anyone help? heres my website: http://www.jcianfrone.com/testing jquery: h**p://www.jcianfrone.com/testing/script.js HTML: <div id="pageContent"> <div class="item"><a href="#page6"><img src="images/wrk-kd.jpg" width="286" height="200" alt="Koodikkki"></a><span id="caption"><a href="#">Title</a><p>Description</p></span></div> <div class="item"><a href="#page7"><img src="images/wrk-kd.jpg" width="286" height="200" alt="Koodikkki"></a><span id="caption"><a href="#">Title</a><p>Description</p></span></div> <div class="item"><a href="#page8"><img src="images/wrk-kd.jpg" width="286" height="200" alt="Koodikkki"></a><span id="caption"><a href="#">Title</a><p>Description</p></span></div> <div class="item"><a href="#page9"><img src="images/wrk-kd.jpg" width="286" height="200" alt="Koodikkki"></a><span id="caption"><a href="#">Title</a><p>Description</p></span></div> </div> Many thanks in advance

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  • Python Process won't call atexit

    - by Brian M. Hunt
    I'm trying to use atexit in a Process, but unfortunately it doesn't seem to work. Here's some example code: import time import atexit import logging import multiprocessing logging.basicConfig(level=logging.DEBUG) class W(multiprocessing.Process): def run(self): logging.debug("%s Started" % self.name) @atexit.register def log_terminate(): # ever called? logging.debug("%s Terminated!" % self.name) while True: time.sleep(10) @atexit.register def log_exit(): logging.debug("Main process terminated") logging.debug("Main process started") a = W() b = W() a.start() b.start() time.sleep(1) a.terminate() b.terminate() The output of this code is: DEBUG:root:Main process started DEBUG:root:W-1 Started DEBUG:root:W-2 Started DEBUG:root:Main process terminated I would expect that the W.run.log_terminate() would be called when a.terminate() and b.terminate() are called, and the output to be something likeso (emphasis added)!: DEBUG:root:Main process started DEBUG:root:W-1 Started DEBUG:root:W-2 Started DEBUG:root:W-1 Terminated! DEBUG:root:W-2 Terminated! DEBUG:root:Main process terminated Why isn't this working, and is there a better way to log a message (from the Process context) when a Process is terminated? Thank you for your input - it's much appreciated.

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  • About fork system call and global variables

    - by lurks
    I have this program in C++ that forks two new processes: #include <pthread.h> #include <iostream> #include <unistd.h> #include <sys/types.h> #include <sys/wait.h> #include <cstdlib> using namespace std; int shared; void func(){ extern int shared; for (int i=0; i<10;i++) shared++; cout<<"Process "<<getpid()<<", shared " <<shared<<", &shared " <<&shared<<endl; } int main(){ extern int shared; pid_t p1,p2; int status; shared=0; if ((p1=fork())==0) {func();exit(0);}; if ((p2=fork())==0) {func();exit(0);}; for(int i=0;i<10;i++) shared++; waitpid(p1,&status,0); waitpid(p2,&status,0);; cout<<"shared variable is: "<<shared<<endl; cout<<"Process "<<getpid()<<", shared " <<shared<<", &shared " <<&shared<<endl; } The two forked processes make an increment on the shared variables and the parent process does the same. As the variable belongs to the data segment of each process, the final value is 10 because the increment is independent. However, the memory address of the shared variables is the same, you can try compiling and watching the output of the program. How can that be explained ? I cannot understand that, I thought I knew how the fork() works, but this seems very odd.. I need an explanation on why the address is the same, although they are separate variables.

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