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  • Do really need a count lock on Multi threads with one CPU core?

    - by MrROY
    If i have some code looks like this(Please ignore the syntax, i want to understand it without a specified language): count = 0 def countDown(): count += 1 if __name__ == '__main__': thread1(countDown) thread2(countDown) thread3(countDown) Here i have a CPU with only one core, do i really need a lock to the variable count in case of it could be over-written by other threads. I don't know, but if the language cares a lot, please explain it under Java?C and Python, So many thanks.

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  • Play! Framework - Can my view template be localised when rendering it as an AsyncResult?

    - by avik
    I've recently started using the Play! framework (v2.0.4) for writing a Java web application. In the majority of my controllers I'm following the paradigm of suspending the HTTP request until the promise of a web service response has been fulfilled. Once the promise has been fulfilled, I return an AsyncResult. This is what most of my actions look like (with a bunch of code omitted): public static Result myActionMethod() { Promise<MyWSResponse> wsResponse; // Perform a web service call that will return the promise of a MyWSResponse... return async(wsResponse.map(new Function<MyWSResponse, Result>() { @Override public Result apply(MyWSResponse response) { // Validate response... return ok(myScalaViewTemplate.render(response.data())); } })); } I'm now trying to internationalise my app, but hit the following error when I try to render a template from an async method: [error] play - Waiting for a promise, but got an error: There is no HTTP Context available from here. java.lang.RuntimeException: There is no HTTP Context available from here. at play.mvc.Http$Context.current(Http.java:27) ~[play_2.9.1.jar:2.0.4] at play.mvc.Http$Context$Implicit.lang(Http.java:124) ~[play_2.9.1.jar:2.0.4] at play.i18n.Messages.get(Messages.java:38) ~[play_2.9.1.jar:2.0.4] at views.html.myScalaViewTemplate$.apply(myScalaViewTemplate.template.scala:40) ~[classes/:na] at views.html.myScalaViewTemplate$.render(myScalaViewTemplate.template.scala:87) ~[classes/:na] at views.html.myScalaViewTemplate.render(myScalaViewTemplate.template.scala) ~[classes/:na] In short, where I've got a message bundle lookup in my view template, some Play! code is attempting to access the original HTTP request and retrieve the accept-languages header, in order to know which message bundle to use. But it seems that the HTTP request is inaccessible from the async method. I can see a couple of (unsatisfactory) ways to work around this: Go back to the 'one thread per request' paradigm and have threads block waiting for responses. Figure out which language to use at Controller level, and feed that choice into my template. I also suspect this might not be an issue on trunk. I know that there is a similar issue in 2.0.4 with regards to not being able to access or modify the Session object which has recently been fixed. However I'm stuck on 2.0.4 for the time being, so is there a better way that I can resolve this problem?

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  • C++ vector and segmentation faults

    - by Headspin
    I am working on a simple mathematical parser. Something that just reads number = 1 + 2; I have a vector containing these tokens. They store a type and string value of the character. I am trying to step through the vector to build an AST of these tokens, and I keep getting segmentation faults, even when I am under the impression my code should prevent this from happening. Here is the bit of code that builds the AST: struct ASTGen { const vector<Token> &Tokens; unsigned int size, pointer; ASTGen(const vector<Token> &t) : Tokens(t), pointer(0) { size = Tokens.size() - 1; } unsigned int next() { return pointer + 1; } Node* Statement() { if(next() <= size) { switch(Tokens[next()].type) { case EQUALS : Node* n = Assignment_Expr(); return n; } } advance(); } void advance() { if(next() <= size) ++pointer; } Node* Assignment_Expr() { Node* lnode = new Node(Tokens[pointer], NULL, NULL); advance(); Node* n = new Node(Tokens[pointer], lnode, Expression()); return n; } Node* Expression() { if(next() <= size) { advance(); if(Tokens[next()].type == SEMICOLON) { Node* n = new Node(Tokens[pointer], NULL, NULL); return n; } if(Tokens[next()].type == PLUS) { Node* lnode = new Node(Tokens[pointer], NULL, NULL); advance(); Node* n = new Node(Tokens[pointer], lnode, Expression()); return n; } } } }; ... ASTGen AST(Tokens); Node* Tree = AST.Statement(); cout << Tree->Right->Data.svalue << endl; I can access Tree->Data.svalue and get the = Node's token info, so I know that node is getting spawned, and I can also get Tree->Left->Data.svalue and get the variable to the left of the = I have re-written it many times trying out different methods for stepping through the vector, but I always get a segmentation fault when I try to access the = right node (which should be the + node) Any help would be greatly appreciated.

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  • VBScript Can not Select XML nodes

    - by urbanMethod
    I am trying to Select nodes from some webservice response XML to no avail. For some reason I am able to select the root node ("xmldata") however, when I try to drill deeper("xmldata/customers") everything is returned empty! Below is the a sample of the XML that is returned by the webservice. <xmldata> <customers> <customerid>22506</customerid> <firstname>Jim</firstname> <issuperadmin>N</issuperadmin> <lastname>Jones</lastname> </customers> </xmldata> and here is the code I am trying to select customerid, firstname, and lastname; ' Send the Xml oXMLHttp.send Xml_to_Send ' Validate the Xml dim xmlDoc set xmlDoc = Server.CreateObject("Msxml2.DOMDocument") xmlDoc.load (oXMLHttp.ResponseXML.text) if(len(xmlDoc.text) = 0) then Xml_Returned = "<B>ERROR in Response xml:<BR>ERROR DETAILS:</B><BR><HR><BR>" end if dim nodeList Set nodeList = xmlDoc.SelectNodes("xmldata/customers") For Each itemAttrib In nodeList dim custID, custLname, custFname custID =itemAttrib.selectSingleNode("customerid").text custLname =itemAttrib.selectSingleNode("lastname").text custFname =itemAttrib.selectSingleNode("firstname").text response.write("News Subject: " & custID) response.write("<br />News Subject: " & custLname) response.write("<br />News Date: " & custFname) Next The result of the code above is zilch! nothing is written to the page. One strange thing is if I select the root element and get its length as follows; Set nodeList = xmlDoc.SelectNodes("xmldata") Response.Write(nodeList.length) '1 is written to page It correctly determines the length of 1. However when I try the same with the next node down as follows; Set nodeList2 = xmlDoc.SelectNodes("xmldata/customers") Response.Write(nodeList.length) '0 is written to page It returns a length of 0. WHY! Please note that this isn't the only way I have attempted to access the values of these nodes. I just can not work out what I am doing wrong. Could someone please help me out. Cheers.

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  • Create a Counter within a For-Loop?

    - by Todd Hartman
    I am a novice programmer and apologize upfront for the complicated question. I am trying to create a lexical decision task for experimental research, in which respondents must decide if a series of letters presented on the screen make a "word" or "not a word". Everything works reasonably well except for the bit where I want to randomly select a word (category A) or nonword (category B) for each of 80 trials from a separate input file (input.txt). The randomization works, but some elements from each list (category A or B) are skipped because I have used "round.catIndex = j;" where "j" is a loop for each successive trial. Because some trials randomly select from Category A and other from Category B, "j" does not move successively down the list for each category. Instead, elements from the Category A list may be selected from something like 1, 2, 5, 8, 9, 10, and so on (it varies each time because of the randomization). To make a long story short(!), how do I create a counter that will work within the for-loop for each trial, so that every word and nonword from Category A and B, respectively, will be used for the lexical decision task? Everything I have tried thus far does not work properly or breaks the javascript entirely. Below is my code snippet and the full code is available at http://50.17.194.59/LDT/trunk/LDT.js. Also, the full lexical decision task can be accessed at http://50.17.194.59/LDT/trunk/LDT.php. Thanks! function initRounds() { numlst = []; for (var k = 0; k<numrounds; k++) { if (k % 2 == 0) numlst[k] = 0; else numlst[k] = 1; } numlst.sort(function() {return 0.5 - Math.random()}) for (var j = 0; j<numrounds; j++) { var round = new LDTround(); if (numlst[j] == 0) { round.category = input.catA.datalabel; } else if (numlst[j] == 1) { round.category = input.catB.datalabel; } // pick a category & stimulus if (round.category == input.catA.datalabel) { round.itemtype = input.catA.itemtype; round.correct = 1; round.catIndex = j; } else if (round.category == input.catB.datalabel) { round.itemtype = input.catB.itemtype; round.correct = 2; round.catIndex = j; } roundArray[i].push(round); } return roundArray; }

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  • Smart Cards Development

    - by user292395
    I need a 'java' source code on how to extract a cap file from the computer and divide it into blocks in order to send it using APDUs to the smart card to install or load or delete an application. Thanks in advance.

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  • Using visual studio 6 c++ compiler from within emacs

    - by jörg
    Hey guys, I'm just getting started with c++ development and I would like to use emacs to write the code and then compile and run it from within emacs using the visual studio 6 compiler. I have already googled around a bit but just can't seem to find an explanation of how this is done. Any pointers? Thanks for your help, joerg

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  • Audio Recording in C++

    - by Cenoc
    Hey, I was wondering, what was a good cross-platform utility for doing audio recording/ playback/ seeking in C++? I was thinking going the route of ALUT (OpenAL), but is there a better way? If not, do you guys know of any good tutorials/sample code for ALUT?

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  • Insert into textarea | JavaScript

    - by Wayne
    I'm trying to insert the image url where the point of the is to be when editing the textarea value. function addImageURL() { var imageurl = prompt("Enter image URL", "Your name") var post = document.getElementById("message-put").value; document.getElementById('message-put').value = post + '[img]' + imageurl + '[/img]'; } This code grabs the value inside the adds the image url next to it which I don't want, I need it to insert it where the point was when editing the textarea Thanks

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  • Server.Transfer does not work?

    - by trnTash
    I want to redirect to another page using Server.Transfer and I have this simple code: if (Page.IsPostBack) { try { Server.Transfer("AnotherPage.aspx"); } catch (Exception) { throw ; } } But I'm getting an error: "Error executing child request for AnotherPage.aspx.". Could not find the solution on the net. Just to mention, Response.Redirect works flawlessly.

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  • python feedparser with yahoo weather rss

    - by mudder
    I'm trying to use feedparser to get some data from yahoos weather rss. It looks like feed parser strips out the yweather namespace data: http://weather.yahooapis.com/forecastrss?w=24260013&u=c <yweather:condition text="Fair" code="34" temp="23" date="Wed, 19 May 2010 5:55 pm EDT" /> looks like feedparser is completely ignoring that. is there away to get it?

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  • Can XPath concatenate two nodeset values? (for use in XForms)

    - by iHeartGreek
    Hi! I am wanting to concatenate two nodeset values using XPath in XForms. I know that XPath has a concat(string, string) function, but how would I go about concatenating two nodeset values? BEGIN EDIT: I tried concat function.. I tried this.. and variations of it to make it work, but it doesn't <xf:value ref="concat(instance('param_choices')/choice/root, .)"/> END EDIT Below is a simplified code example of what I am trying to achieve. XForms model: <xf:instance id="param_choices" xmlns=""> <choices> <root label="Param Choices">/param</root> <choice label="Name">/@AAA</choice> <choice label="Value">/@BBB</choice> </choices> </xf:instance> XForms ui code that I currently have: <xf:select ref="instance('criteria_data')/criteria/criterion" appearance="full"> <xf:label>Param choices:</xf:label> <br/> <xf:itemset nodeset="instance('param_choices')/choice"> <xf:label ref="@label"></xf:label> <xf:value ref="."></xf:value> </xf:itemset> </xf:select> (if user selects "Name" checkbox..) the XML output is: <criterion>/@BBB</criterion> However! I want to combine the root nodeset value with the current choice nodeset value. Essentially: <xf:value ref="(instance('definition_choices')/choice/root) + ."/> to achieve the following XML output: <criterion>/param/@BBB</criterion> Any suggestions on how to do this? (I am fairly new to XPath and XForms) p.s. what I am asking makes sense to me when I typed it out, but if you have trouble figuring out what I'm asking, just let me know.. thanks!

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  • Iphone sdk - How to setup a 'template'

    - by Dave
    I've been working on a Cook Book App and I've been making each page individually which takes a really long time to do, I asked a question similar to this and it was brought to my attention that you can setup a way to automate the design process so all you need to do is input your data. Can someone please explain in as much detail as possible how you setup your xcode files/code to automate this process Thanks

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  • Is the google docs embeddable previewer out of beta and will it have an have an API?

    - by Jonathan Hendler
    https://docs.google.com/viewer is awesome, but there are some customizations I need to make, and documentation would be helpful. Discovered here http://googlesystem.blogspot.com... . Haven't seen any public documentation that would help. http://code.google.com/apis/documents/overview.html covers the Google docs - where the above is more a clone of the Google Books previewer http://books.google.com/books .

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  • How to get the path of app(without app.exe)?

    - by iPhoney
    I want to get the path of my app like: "\\ProgramFiles\\myApp", I try to use the following code: string path = System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase; But it returns a path which has "\\myapp.exe" at the end. I also tried: string path = System.IO.Directory.GetCurrentDirectory(); But it throws an “NotSupportedException”. Is there any way to get a path without .exe at the end?

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  • Table View in iPhone

    - by user265260
    I have this code [tableView deselectRowAtIndexPath:indexPath animated:YES]; Why doesn't the table view deselect the row, What am i doing wrong. EDIT: -(void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath{ [tableView deselectRowAtIndexPath:indexPath animated:YES]; }

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  • How to access nested iframes?

    - by Debugger
    I need to send post message to iframe. currently its working if i have single iframe inside parent page.But I want to make it work for nested iframes. Criterias are : I can just add listener code in last leaf iframe. Do not know length of iframe nesting. Need both way communication , from parent to child also by leaf iframe to parent. I am sick of third part iframes , please suggest me some appropriate solution.

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  • Lift session valid ajax callback from a static javascript

    - by ChrisJamesC
    I am currently implementing a graph visualisation tool using lift on the server side and d3 ( a javascript visualisation framework) for all the visualisation. The problem I have is that in the script I want to get session dependent data from the server. So basically, my objective is to write lift-valid ajax callbacks in a static js script. Here is what I tried so far: What I have tried so far If you feel that the best solution is one that I already tried feel free to post a detailed answer telling me how to use it exactly and how it completely solves my problem. REST interface Usually what one would do to get data from a javascript function in lift is to create a REST interface. However this interface will not be linked to any session. This is the solution I got from my previous question: Get json data in d3 from lift snippet Give function as argument of script Another solution would be to give the ajaxcallback as an argument of the main script called to generate my graph. However I expect to have a lot of callbacks and I don't want to have to mess with the arguments of my script. Write the ajax callback in another script using lift and call it from the main script This solution, which is similar to a hidden text input is probably the more likely to work. However it is not elegant and it would mean that I would have to load a lot of scripts on load, which is not really conveniant. Write the whole script in lift and then serve it to the client This solution can be elegant, however my script is very long and I would really prefer that it remainss static. What I want On client side While reviewing the source code of my webpage I found that the callback for an ajaxSelect is: <select onchange="liftAjax.lift_ajaxHandler('F966066257023LYKF4=' + encodeURIComponent(this.value), null, null, null)" name="F96606625703QXTSWU" id="node_delete" class="input"> Moreover, there is a variable containing the state of the page in the end of the webpage: var lift_page = "F96606625700QRXLDO"; So, I am wondering if it is possible to simulate that my ajaxcall is valid using this liftAjax.lift_ajaxHandler function. However I don't know the exact synthax to use. On server side Since I "forged" a request on client side, I would now like to get the request on client side and to dispatch it to the correct function. This is where the LiftRules.dispatch object seems the best solution: when it is called, all the session management has been made (the request is authentified and linked to a session), however I don't know how to write the correct piece of code in the append function. Remark In lift all names of variables are changed to a random string in order to increase the security, I would like to have the same behavior in my application even if that will probably mean that I will have to "give" the javascript these values. However an array of 15 string values is still a better tradeoff than 15 functions as argument of a javascript function.

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