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Do spurious wakeups in Java actually happen?
..._wait() function in Linux is implemented using the futex system call. Each blocking system call on Linux returns abruptly with EINTR when the process receives a signal. ... pthread_cond_wait() can't restart the waiting because it may miss a real wakeup in the little time it was outside the futex sys...
Changing variable names in Vim
...sume is going through obfuscated code where you're likely to have multiple blocks with same var names); but with the question name like that many people coming here from google searches probably look for a less situation-specific ways to rename variables in VIM -- and those can be more concise
I'm ...
java.net.SocketException: Connection reset
...tion. This exception is raised if the configured timeout is exceeded while blocked on a socket operation. The state of the socket itself is not changed when this exception is thrown, but if your exception handler closes the socket, and then tries to write to it, you'll be in a connection reset condi...
Calculate the center point of multiple latitude/longitude coordinate pairs
...
I found this post very useful so here is the solution in PHP. I've been using this successfully and just wanted to save another dev some time.
/**
* Get a center latitude,longitude from an array of like geopoints
*
* @param array data 2 dimensional array of latitudes and longit...
How to replace an entire line in a text file by line number
...ained in the comments: the 1 always evaluates true, so the associated code block always runs. But there is no associated code block, which means AWK does its default action of just printing the whole line. AWK is designed to allow terse programs like this.
...
Java Desktop application: SWT vs. Swing [closed]
...arison done on SWT/Swing/AWT.
http://www.developer.com/java/other/article.php/10936_2179061_2/Swing-and-SWT-A-Tale-of-Two-Java-GUI-Libraries.htm
And here's the site where you can get tutorial on basically anything on SWT (http://www.java2s.com/Tutorial/Java/0280__SWT/Catalog0280__SWT.htm)
Hope yo...
What does “%” (percent) do in PowerShell?
It seems that the % operation starts script blocks after the pipeline, although about_Script_Blocks indicates the % isn't necessary.
...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...ector component to rotate an ImageSprite on canvas. The Designer view and block view of this demo app are shown below.
Here’s how to implement the rotationSprite app:
On Screen1, there is a Canvas, Canvas1, which contains an ImageSprite (ArrowSprite) that we want to rotate. Label1 will show...
Style child element when hover on parent
...u.
.parentDiv{
margin : 25px;
}
.parentDiv span{
display : block;
padding : 10px;
text-align : center;
border: 5px solid #000;
margin : 5px;
}
.parentDiv div{
padding:30px;
border: 10px solid green;
display : inline-block;
align : cente;
}
.parentDiv:hover{
...
Ruby Array find_first object?
...
use array detect method if you wanted to return first value where block returns true
[1,2,3,11,34].detect(&:even?) #=> 2
OR
[1,2,3,11,34].detect{|i| i.even?} #=> 2
If you wanted to return all values where block returns true then use select
[1,2,3,11,34].select(&:even?) ...