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  • How is spin lock implemented under the hood?

    - by httpinterpret
    This is a lock that can be held by only one thread of execution at a time. An attempt to acquire the lock by another thread of execution makes the latter loop until the lock is released. How does it handle the case when two threads try to acquire the lock exactly the same time? I think this question also applies to various of other mutex implementation.

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  • cscope with Clearcase codebase

    - by codingfreak
    Hi I have a small doubt in using cscope with clearcase views. Before I used to use ctags and used to run script which creates tag files within the directories of codebase for each clearcase view as a result I can use multiple clearcase views with different codebases at once. But in case of cscope, database is getting created in my home directory as a result I have to build cscope database everytime and not able to use parallely different clearcase views with different codebases. Is there any solution for this problem ??

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  • Gravatar : Is there a default image?

    - by Ritesh M Nayak
    I have implemented gravatar for a portal I am building and wanted to know if there is a default image URL for gravatar? Not all people who visit the site are logged in or have email addresses, in such a case, is there a default image that can be shown (accessible via gravatar url)

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  • is there a default back key(on device) listener in android???

    - by androidbase Praveen
    hi all, i am having two activities A and B. when i click the button in A that will shows B. when i click the Button in B it backs to A. i had set the overridePendingTransition method after the finish() method. it works properly. but in case the current Activity is B. on that time i click the default back button in the device. it shows the right to left transition to show the Activity A. how i can listen that Default back key on device.?????

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  • Git for Websites / post-receive / Separation of Test and Production Sites

    - by Walt W
    Hi all, I'm using Git to manage my website's source code and deployment, and currently have the test and live sites running on the same box. Following this resource http://toroid.org/ams/git-website-howto originally, I came up with the following post-receive hook script to differentiate between pushes to my live site and pushes to my test site: while read ref do #echo "Ref updated:" #echo $ref -- would print something like example at top of file result=`echo $ref | gawk -F' ' '{ print $3 }'` if [ $result != "" ]; then echo "Branch found: " echo $result case $result in refs/heads/master ) git --work-tree=c:/temp/BLAH checkout -f master echo "Updated master" ;; refs/heads/testbranch ) git --work-tree=c:/temp/BLAH2 checkout -f testbranch echo "Updated testbranch" ;; * ) echo "No update known for $result" ;; esac fi done echo "Post-receive updates complete" However, I have doubts that this is actually safe :) I'm by no means a Git expert, but I am guessing that Git probably keeps track of the current checked-out branch head, and this approach probably has the potential to confuse it to no end. So a few questions: IS this safe? Would a better approach be to have my base repository be the test site repository (with corresponding working directory), and then have that repository push changes to a new live site repository, which has a corresponding working directory to the live site base? This would also allow me to move the production to a different server and keep the deployment chain intact. Is there something I'm missing? Is there a different, clean way to differentiate between test and production deployments when using Git for managing websites? As an additional note in light of Vi's answer, is there a good way to do this that would handle deletions without mucking with the file system much? Thank you, -Walt PS - The script I came up with for the multiple repos (and am using unless I hear better) is as follows: sitename=`basename \`pwd\`` while read ref do #echo "Ref updated:" #echo $ref -- would print something like example at top of file result=`echo $ref | gawk -F' ' '{ print $3 }'` if [ $result != "" ]; then echo "Branch found: " echo $result case $result in refs/heads/master ) git checkout -q -f master if [ $? -eq 0 ]; then echo "Test Site checked out properly" else echo "Failed to checkout test site!" fi ;; refs/heads/live-site ) git push -q ../Live/$sitename live-site:master if [ $? -eq 0 ]; then echo "Live Site received updates properly" else echo "Failed to push updates to Live Site" fi ;; * ) echo "No update known for $result" ;; esac fi done echo "Post-receive updates complete" And then the repo in ../Live/$sitename (these are "bare" repos with working trees added after init) has the basic post-receive: git checkout -f if [ $? -eq 0 ]; then echo "Live site `basename \`pwd\`` checked out successfully" else echo "Live site failed to checkout" fi

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  • Django site on Nginx+FastCGI goes (504 gateway timeout)

    - by jack
    Sometimes my whole Django based site goes into 504 gateway timeout errors so none page can be displayed. Is it possible to write a shell program and cronjob it run every 5 minutes to detect such errors and restart FastCGI process if needed? I'm currently using command below to restart FastCGI in case it's crashed but it doesn't work for above situation because when 504 gateway errors occur, the processes are still running. ps ax | grep -v grep | grep port=8001 > /dev/null || restart_fcgi.sh

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  • Duplicate content in ASP.NET MVC because of custom routes MapRoute(), are areas the rescue?

    - by artvolk
    I use custom routes for my URLs and my action become accessible via two URLs (not counting trailing slash and lower\upper case letters): one via my custom route /my-custom-route-url/ and one via default /controller/action. I see one possible solution -- put all controllers which use default routing (they are mostly backend) in one area, and place all others in separate area and use it without default route. May be there is a better way?

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  • PHP Equivalent of Java Type-Casting Solution

    - by stjowa
    Since PHP has no custom-class type-casting, how would I go about doing the PHP equivalent of this Java code: CustomBaseObject cusBaseObject = cusBaseObjectDao.readCustomBaseObjectById(id); ((CustomChildObject) cusBaseObject).setChildAttribute1(value1); ((CustomChildObject) cusBaseObject).setChildAttribute2(value2); In my case, it would very nice if I could do this. However, trying this without type-casting support, it gives me an error that the methods do not exist for the object. Thanks, Steve

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  • "Fix" String encoding in Java

    - by Nico
    I have a String created from a byte[] array, using UTF8 encoding. However, it should have been created using another encoding (windows-1252). Is there a way to convert this string back to the right encoding? I know it's easy to do if you have access to the original byte array, but it my case it's too late because it's given by a closed source library. Thanks, Nico

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  • Handling empty UITableView in UITableViewController

    - by Travis
    I have a UITableViewController that is populated with some data. If the data comes back empty, obviously the table is empty. What is the appropriate method to use to handle this case and put up something like a UILabel with "No Data Available". I have been using - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section but it's proven a bit cumbersome and I'm not longer confident it's the best place to do this.

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  • How to work with this turing machine?

    - by Lazer
    This is a screenshot of the applet LogiCell 1.0, link to which I found here. As the bottom left corner shows, this is doing sum 0+1 and the result is 01b (bottom right hand side). I am not able to link what is displayed to what the inputs ans outputs are. For example in this case - seeing the snapshot, how do you determine that the inputs are 0 and 1 and the output is 01?

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  • matlab's phi symbol

    - by ldigas
    Not that significant, but annoying to no end. Why does matlab has no small phi (\varphi) symbol ? It has pretty much all other symbols LaTeX offers, but not this one. Why ? I may be wrong of course, in which case would be delighted if someone could prove me wrong...

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  • Pocket IE has some maximum width for textboxes?

    - by eidylon
    I have a page running on WinMo 6.1 Pocket IE. It seems I cannot make a textbox wider than 219 pixels, is this the case? I've tried width="100%" width="300px" style="width: 100%;" style="width: 300px;" columns="50" but no matter what I do, the textbox will not grow beyond 219 pixels wide, which looks kinda dorky on a 320x screen. Does pIE really limit the width of a textbox???

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  • Getting PHP error/warnings when using CodeIgniter 2 to send email

    - by Sparky672
    I'm using Ion Auth and trying to implement the forgotten password feature which relies upon an email being sent from CI. My LAMP server is on a shared cPanel account and uses sendmail. However, I have the ability to over-ride any PHP settings with my own php.ini file in the public_html directory. As per the CodeIgniter 2 documentation for configuring email sending, I have done the following... 1) created a file called located at application/config/email.php 2) email.php contains this code: <?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); /* | ------------------------------------------------------------------- | EMAIL SENDING SETTINGS | ------------------------------------------------------------------- */ $config['protocol'] = 'sendmail'; /* End of file email.php */ /* Location: ./application/config/email.php */ 3) The in the application/config/ion_auth.php file, I set this value to TRUE $config['use_ci_email'] = TRUE; The email is successfully sent, but I get a variety of PHP Error Warnings on all pages. These appear on all pages, sometimes two or three times in a row: A PHP Error was encountered Severity: Warning Message: date() [function.date]: It is not safe to rely on the system's timezone settings. You are required to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/New_York' for 'EST/-5.0/no DST' instead Filename: libraries/Email.php Line Number: 704 A PHP Error was encountered Severity: Warning Message: date() [function.date]: It is not safe to rely on the system's timezone settings. You are required to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/New_York' for 'EST/-5.0/no DST' instead Filename: libraries/Email.php Line Number: 709 In addition to the above, these two also show up after the forgotten password form is submitted: A PHP Error was encountered Severity: Warning Message: Cannot modify header information - headers already sent by (output started at /home/username/codeigniter/system/core/Exceptions.php:185) Filename: libraries/Session.php Line Number: 675 A PHP Error was encountered Severity: Warning Message: Cannot modify header information - headers already sent by (output started at /home/username/codeigniter/system/core/Exceptions.php:185) Filename: helpers/url_helper.php Line Number: 540 I'm not sure why I would be getting these Error Warnings or how else I am supposed to configure my email sending options. I don't see any other email sending options in the documentation that is related to these particular Warning Messages. When I remove my config/email.php file AND set Ion Auth's use_ci_email to FALSE, the Error Warnings go away. Where did I go wrong? Just before I hit the submit button, I solved this problem. I'm still going to post this question as a learning experience for others. If nobody solves this after a reasonable amount of time, I'll post the solution.

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  • Android: Unregister camera button

    - by niko
    Hi, I tried to bind some actions to a camera button: videoPreview.setOnKeyListener(new OnKeyListener(){ public boolean onKey(View v, int keyCode, KeyEvent event){ if(event.getAction() == KeyEvent.ACTION_DOWN) { switch(keyCode) { case KeyEvent.KEYCODE_CAMERA: //videoPreview.onCapture(settings); onCaptureButton(); ... } } return false; } }); Pressing the button however the application crashes because the original Camera application starts. Does anyone know how to prevent Camera application start when the camera button is pressed?

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  • UpdateProgress with UpdatePanel not showing up in User control when page is loading

    - by Carter
    Is this typical behavior of the UpdateProgress for an ASP.Net UpdatePanel? I have an update panel with the UpdateProgress control inside of a user control window on a page. If I then make the page in the background do some loading and click a button in the user control update panel the UpdateProgress does not show up at all. It's like the UpdatePanels refresh request is not even registered until after the actual page is done doing it's business. It's worth noting that it will show up if nothing is happening in the background. The functionality I want is what you would expect. I want to loader to show up if it has to wait for anything to get it's refresh done when after the button is clicked. I know I can get this functionality if I just use jquery ajax with a static web method, but you can't have static web methods inside of a user control. I could have it in the page but it really doesn't belong there. A full-blown wcf wouldn't really be worth it in this case either. I'm trying to compromise with an UpdatePanel but these things always seem to cause me some kind of trouble. Maybe this is just the way it works? Edit:So I'll clarify a bit what I'm doing. What's happening is I have a page and all it has on it are some tools on the side and a big map. When the page initially loads it takes some time to load the map. Now if while it's loading I open up the tool (a user control) that has the update panel in question in it and click the button on this user control that should refresh the update panel with new data and show the loading sign (in the updateprogress) then the UpdateProgress loading image does not show up. However, the code run by the button click does run after the page is done loading (as expected) and The UpdateProgress will show up if nothing on the page containing the user control is loading. I just want the loader to show up while the page is loading. I thought my problem was that perhaps the map loading is in an update panel and my UpdateProgress was only being associated with the update panel for the user control's update panel. Hence, I would get no loading icon when the map was loading. This is not the case though.

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  • Encrypt parameters passed to a swf

    - by 23tux
    Hi, does anyone know how to encrypt the parameters that are passed to a flash movie? The case is, that the user should not be able to read the parameters in the source code in plaintext. And of course, I have to able to decrypt the parameter in actionscript 3 ;-) thx, tux

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