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  • Is memory allocation in linux non-blocking?

    - by Mark
    I am curious to know if the allocating memory using a default new operator is a non-blocking operation. e.g. struct Node { int a,b; }; ... Node foo = new Node(); If multiple threads tried to create a new Node and if one of them was suspended by the OS in the middle of allocation, would it block other threads from making progress? The reason why I ask is because I had a concurrent data structure that created new nodes. I then modified the algorithm to recycle the nodes. The throughput performance of the two algorithms was virtually identical on a 24 core machine. However, I then created an interference program that ran on all the system cores in order to create as much OS pre-emption as possible. The throughput performance of the algorithm that created new nodes decreased by a factor of 5 relative the the algorithm that recycled nodes. I'm curious to know why this would occur. Thanks. *Edit : pointing me to the code for the c++ memory allocator for linux would be helpful as well. I tried looking before posting this question, but had trouble finding it.

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  • Removing Redundant Data from a List<T>

    - by Mark
    I have a List of objects which are ordered. I would like to remove redundant objects where redundant does not necessarily mean duplicate. Here is an example: List<Point> points = new List<Point> { new Point(0, 10), new Point(1, 12), new Point(2, 16), new Point(3, 16), new Point(4, 16), new Point(5, 13), new Point(6, 16), }; I am interested in removing the new Point(3, 16) entry because it doesn't provide useful information; I already know that the element at 2=16 and the element at 4=16. The information that 3=16 doesn't do me any good in my application (because I already have the bounds {2,4}=16), so I would like to remove that entry. I'd also like to not that I want to keep the 5th and 6th entry because there are not consecutive entries where Y=16. Is there a slick way to do this with linq?

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  • Php mail pulling form data from previous page

    - by Mark
    So I have a form being filled out on one php like so: <p> <label for="first_name">First Name: </label> <input type="text" size="30" name="first_name" id="first_name"/> </p> <p> <label for="last_name"> Last Name:</label> <input type="text" size="30" name="last_name" id="last_name"/> </p> <p> <label for="address_street">Street:</label> <input type="text" size="30" name="address_street" id="address_street"/> </p> <p> <label for="address_city">City:</label> <input type="text" size="30" name="address_city" id="address_city"/> </p> <p> <label for="address_state">State/Province:</label> <input type="text" size="30" name="address_state" id="address_state"/> </p> <p> <label for="email">Your e-mail: </label> <input type="text" size="30" name="email" id="email"/> </p> <p> <label for="phone">Your phone number: </label> <input type="text" size="30" name="phone" id="phone"/> </p> This is on one php page. From here, it goes to another php which part of it contains script to send a html email to recipient. Problem is, I cannot seem to get it to pull the variables even though I thought I declared them correctly and mixed them into the html correctly. <?php $first_name = $_POST['first_name']; $last_name = $_POST['last_name']; $to = "[email protected], [email protected]"; $subject = "HTML email for ALPS"; $message .= ' <html> <body> <div style="display: inline-block; width: 28%; float: left;"> <img src="http://englishintheusa.com/images/alps-logo.jpg" alt="ALPS Language School" /> </div> <div style="display: inline-block; width: 68%; float: right;"> <p style="color: #4F81BD; font-size: 20px; text-decoration: underline;">Thanks You For Your Inquiry!</p> </div> <div style="padding-left: 20px; color: #666666; font-size: 16.8px; clear: both;"> <p>Dear $first_name $last_name ,</p> </br > <p>Thank you for the following inquiry:</p> </br > </br > </br > </br > <p>****Comment goes here****</p> </br > </br > <p>We will contact you within 2 business days. Our office is open Monday-Friday, 8:30 AM - 5:00 PM Pacific Standard Time.</p> </br > <p>Thank you for your interest!</p> </br > </br > <p>Best Regards,</p> </br > </br > <p>ALPS Language School</p> </br > </br > <p>430 Broadway East</p> <p>Seattle WA 98102</p> <p>Phone: 206.720.6363</p> <p>Fax: 206. 720.1806</p> <p>Email: [email protected]</p> </div> </body> </html>'; // Always set content-type when sending HTML email $headers .= "MIME-Version: 1.0" . "\r\n"; $headers .= "Content-type:text/html;charset=UTF-8" . "\r\n"; // More headers mail($to,$subject,$message,$headers); ?> So you see where I am trying to get first_name and last_name. Well it doesn't come out correctly. Can someone help here?

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  • Are PDO prepared statements sufficient to prevent SQL injection?

    - by Mark Biek
    Let's say I have code like this: $dbh = new PDO("blahblah"); $stmt = $dbh->prepare('SELECT * FROM users where username = :username'); $stmt->execute( array(':username' => $_REQUEST['username']) ); The PDO documentation says The parameters to prepared statements don't need to be quoted; the driver handles it for you. Is that truly all I need to do to avoid SQL injections? Is it really that easy? You can assume MySQL if it makes a difference. Also, I'm really only curious about the use of prepared statements against SQL injection. In this context, I don't care about XSS or other possible vulnerabilities.

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  • In Symfony how can you instantely cache the routing.yml?

    - by Mark
    I have a file located at [application]/config/routing.yml, when I change something in there, the changes aren't active. This probably has to do with the cache as when I go into that directory [cache]/[application]/prod/config the currently active file can be seen config_routing.yml.php. The lifetime of the cache is generally 86400 seconds, is there a way that I can immediately view/activate the changes?

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  • Restoring web reference in Visual Studio 2008

    - by Mark Cheeseborough
    I had a web reference set in my VS2008 ASP.NET project, but due to some source control weirdness it is no longer listed in the project. I have the set of files in the Web References folder under my project. There's a .wsdl, .disco and several .datasource files. Is there any way to re-add this web reference through the existing files rather than using the "Add Web Reference" dialog?

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  • hibernate insert to a collection causes a delete then all the items in the collection to be inserted

    - by Mark
    I have a many to may relationship CohortGroup and Employee. Any time I insert an Employee into the CohortGroup hibernate deletes the group from the resolution table and inserts all the members again, plus the new one. Why not just add the new one? The annotation in the Group: @ManyToMany(cascade = { PERSIST, MERGE, REFRESH }) @JoinTable(name="MYSITE_RES_COHORT_GROUP_STAFF", joinColumns={@JoinColumn(name="COHORT_GROUPID")}, inverseJoinColumns={@JoinColumn(name="USERID")}) public List<Employee> getMembers(){ return members; } The other side in the Employee @ManyToMany(mappedBy="members",cascade = { PERSIST, MERGE, REFRESH } ) public List<CohortGroup> getMemberGroups(){ return memberGroups; } Code snipit Employee emp = edao.findByID(cohortId); CohortGroup group = cgdao.findByID(Long.decode(groupId)); group.getMembers().add(emp); cgdao.persist(group); below is the sql reported in the log delete from swas.MYSITE_RES_COHORT_GROUP_STAFF where COHORT_GROUPID=? insert into swas.MYSITE_RES_COHORT_GROUP_STAFF (COHORT_GROUPID, USERID) values (?, ?) insert into swas.MYSITE_RES_COHORT_GROUP_STAFF (COHORT_GROUPID, USERID) values (?, ?) insert into swas.MYSITE_RES_COHORT_GROUP_STAFF (COHORT_GROUPID, USERID) values (?, ?) insert into swas.MYSITE_RES_COHORT_GROUP_STAFF (COHORT_GROUPID, USERID) values (?, ?) insert into swas.MYSITE_RES_COHORT_GROUP_STAFF (COHORT_GROUPID, USERID) values (?, ?) insert into swas.MYSITE_RES_COHORT_GROUP_STAFF (COHORT_GROUPID, USERID) values (?, ?) This seams really inefficient and is causing some issues. If sevral requests are made to add an employee to the group then some get over written.

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  • ASP.NET MVC: trying out a script injection hangs Visual Studio 2010 completely?

    - by Mark Redman
    Wondering if anyone has an idea of whats going on: I am new to ASP.NET MVC and am trying out a few things with jquery/ajax. The basic scenario is a dropdownlist with an add button next to it. Clicking the add button launches a jquery ui dialog with a textbox form, entering a value saves the item to the database and refreshes the drop-downlist. The dropdownlist is re-populated using a JSON result. This all works ok. I thought I would try a script injetion attack, ie add the text: alert("oh dear") to seee what would happen and to check if I need to encode anything. When I try and save this item (similar to the same process of adding a plain text entry) Visual Studio 2010 Beta 2 hangs completely. Any ideas? UPDATE: It happens when posting: "</"

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  • Default for generic type?

    - by Mark
    Is it possible to do something like public class PriorityQueue<TValue, TPriority=int> where TPriority : IComparable (note the =int) ? Before you suggest it, yes, I know I can just add another line: public class PriorityQueue<TValue> : PriorityQueue<TValue, int> { } But I'm wondering if it's possible to do it as a param.

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  • TargetInvocationException?

    - by Mark
    Why would these lines of code cause that exception private Dispatcher dispatcher = null; public DownloadManager(Dispatcher dispatcher = null) { this.dispatcher = dispatcher ?? Dispatcher.CurrentDispatcher; } When the DownloadManager is instantiated in the XAML like <Window.DataContext> <c:DownloadManager /> </Window.DataContext> ?

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  • Use alternative browser with Subversion URLs

    - by Mark Howard
    We have subversion setup with http access through apache at http ://svn.local/ This provides access through svn clients and the standard svn repository browser. We also have a separate repository browser installed at http ://svn-browser.local/ (fisheye in this case). Is it possible to change the subversion/apache server so that browser requests are redirected to the subversion browser, but requests from svn clients go to the subversion server? Essentially, I'd like to use a single URL to identify a resource in both svn clients and the svn browser and be able to copy the url from a svn client into a web browser to have the enhanced functionality provided by the browser.

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  • asp.net and Visual studio root directory question

    - by Mark Kadlec
    I am seeing something very odd and thought I would ask the Stackoverflow community if they knew the answer. I have an asp.net project that runs fine in one environment, but couldn't figure out what happened to the styles in another environment. In the first environment (Windows 2008 Server), the following link worked fine: <link href="/Styles/09/style.css" rel="stylesheet" type="text/css" /> but in the other environment (it's a Windows 7), I had to change it to work: <link href="../Styles/09/style.css" rel="stylesheet" type="text/css" /> Notice that the directories seemed to shift ahead one directory in the Win7, what's going on? It's like the "running" directory seems now be the \bin directory instead of the home! Which environment is configured correctly? How do I determine execution directory level? My concern going forward is pushing to a prod environment and guessing which configuration is correct. Any insight would be appreciated!

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  • Is there a way to simplify this Django query?

    - by Mark
    accepted_bids = Bid.objects.filter(shipment__user=u, status='acc').select_related('shipment') completed_shipments = [] for b in accepted_bids: completed_shipments.append(b.shipment) vehicles_shipped = [] for s in completed_shipments: vehicles_shipped.extend(s.items.all()) In the end, I want a list of shipped vehicles. A vehicle is shipped if it's part of a shipment that's completed. A shipment is completed if it has an accepted bid. I'd prefer not to iterate over the querysets thereby forcing a hit to the DB before its necessary... isn't there a way to get all the associated shipments from a list of bids, for example?

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  • iPhone: How can you draw a piece of an image

    - by Mark
    Code sample - (void)drawRect:(CGRect)rect { [super drawRect:rect]; CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSaveGState(context); CGContextTranslateCTM(context, 0, self.frame.size.height); CGContextScaleCTM(context, 1.0, -1.0); CGContextDrawImage(context, CGRectMake(0.0, 0.0, self.frame.size.width, self.frame.size.height), [UIImage imageNamed:@"sample.png"].CGImage); CGContextRestoreGState(context); } ================ I would like to copy a certain rect within an image to the context, so not the entire image is drawn but just a piece of the image. Does anyone have a solution for this? I can't find anything on google nor the documentation. I know there are alternatives like: 1. Create a UIView with clipping and then just position the UIImageView within it. 2. Create the UIImageView within the UIScrollView and use content offset. But I think those are lame...

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  • Asynchronous database update in Django?

    - by Mark
    I have a big form on my site. When the users fill it out and submit it, most of the data just gets dumped to the database, and then they get redirected to a new page. However, I'd also like to use the data to query another site, and then parse the results. That might take a bit longer. It's not essential that the user sees these results right away, so I was wondering if it's possible to asynchronously call a function that will handle this, and then return an HttpResponse from my view like usual without making them wait? If so... how? Any particular libraries I should look at?

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  • After a period of time, nslookup still works, but pinging, and an auto-refeshed website, fails.

    - by Mark Hurd
    Contrary to this question this is for a dotted name (gw.localnet.au), and it doesn't happen straight away. Only after some period of time (quite a long time, possibly days). In fact this is for my ADSL router and its internal IP address which I have named within the router itself and in my Windows Server 2003 Domain Controller DNS Service. Specifically, localnet.au is a Active-Directory-backed primary domain. In fact, an ipconfig /flushdns may fix the problem, but only after a while (about the time it took me to type in this question :-) ). That doesn't explain the root cause though...

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  • How to display data into datagridview using multi thread?

    - by Mark
    Hi, I have application where I read/receive data all the time (text) and I need to display this data into datagridview, what is the best way to do that in real time, so the data will be changed all the time. I thought about multi threading, if this is a good idea can you guide me with link to explain how to implement it. Thanks

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  • Creating an enum/class from a Database Table

    - by Mark
    I have a database table that essentially contains different types of things. I'll use animals as an example. I have a table called AnimalTypes: AnimalTypes { ID:int, Name:string } I then populate it with: 1:Dog, 2:Cat, 3:Fish I would like to then have some sort of C# object created that functions similar to this enum be entirely read from the database: enum AnimalTypes { Dog = 1, Cat = 2, Fish = 3 } Is there a way to create an enum/class from a database table as described? I basically want to be able to reference things in the AnimalTypes table using intellisense and AnimalTypes.Dog as an example; I don't actually need an enum, just something that kind of functions like one. Is this possible? Edit: I'm not really that thrilled about generating a DLL as I've seen in other related problems. I feel like this should be possible with reflection.

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  • How to set utf8 in the auto-generated PHP code of flash builder 4 ?

    - by Mark
    HI, PHP problem here (I think): I've just created a Flex (Flash Builder) project with a datagrid linked to a database - the database is all utf8. When I run the project using the auto-generated code in flex4, the non-English part comes like ????? while the English part comes fine. The auto-generated PHP code uses mysqli. I've tried: $this->connection->set_charset('utf8'); or mysqli_query($this->connection,"SET NAMES utf8"); I also tried writing the code myself (I'm not a PHP guy): mysql_query("set names utf8"); was fine - but that's mysql and not mysqli (that's an "i" after the mysql) and I want to use the auto-generated code... any help is appreciated.

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  • How can I quickly sum all numbers in a file?

    - by Mark Roberts
    I have a file which contains several thousand numbers, each on it's own line: 34 42 11 6 2 99 ... I'm looking to write a script which will print the sum of all numbers in the file. I've got a solution, but it's not very efficient. (It takes several minutes to run.) I'm looking for a more efficient solution. Any suggestions?

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