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Multi-line commands in GHCi
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@Rog let begins a block; entries in a block are grouped by indentation; and the first non-whitespace character in a block sets the indentation by which they're grouped. Since the first non-whitespace character in the let block above is the a o...
Increasing the maximum number of TCP/IP connections in Linux
...o move session info from an application level session storage to redis via PHP. For some reason, I could not add more than 28230 sessions without adding lots of sleep in one go, with no errors seen either in php or on redis logs. We broke our heads on this for an entire day till I thought maybe prob...
Growing Amazon EBS Volume sizes [closed]
...it can't be done on the fly. You'll need to take a snapshot of the current block, add a new, larger block and re-attach your snapshot.
There's a simple walkthrough here based on using Amazon's EC2 command line tools
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What does auto do in margin:0 auto?
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From the CSS specification on Calculating widths and margins for Block-level, non-replaced elements in normal flow:
If both 'margin-left' and 'margin-right' are 'auto', their used values are equal. This horizontally centers the element with respect to the edges of the containing block....
What is the difference between atomic / volatile / synchronized?
... //thread-safe, SRSLy?
}
No two threads can enter the same synchronized block with the same lock. In this case (and similarly in your code) the lock object changes upon every execution, so synchronized effectively has no effect.
Even if you have used a final variable (or this) for synchronizatio...
After submitting a POST form open a new window showing the result
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var urlAction = 'whatever.php';
var data = {param1:'value1'};
var $form = $('<form target="_blank" method="POST" action="' + urlAction + '">');
$.each(data, function(k,v){
$form.append('<input type="hidden" name="' + k + '" value="' + v ...
What is an SSTable?
... in a specified key range. Internally, each SSTable contains a sequence of blocks (typically each block is 64KB in size, but this is configurable). A block index (stored at the end of the SSTable) is used to locate blocks; the index is loaded into memory when the SSTable is opened. A lookup can be p...
When to use Task.Delay, when to use Thread.Sleep?
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Use Thread.Sleep when you want to block the current thread.
Use Task.Delay when you want a logical delay without blocking the current thread.
Efficiency should not be a paramount concern with these methods. Their primary real-world use is as retry timers fo...
jQuery.inArray(), how to use it right?
...e is present in an array, follow the below practice:
myArray = new Array("php", "tutor");
if( $.inArray("php", myArray) !== -1 ) {
alert("found");
}
Reference
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MySQL query String contains
...ttacks. Also, mysql_real_escape_string is going to be deprecated in future PHP releases.
– Jack Tuck
Feb 3 '14 at 21:24
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