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Ruby, Difference between exec, system and %x() or Backticks
... This is not so simple. In my case it "was OK (and need) to block until the process complete" to then use popen3 to check the STDOUT/STDERR outputs.
– Nakilon
Sep 25 '16 at 3:06
...
Do zombies exist … in .NET?
...either using a lock statement instead, or putting the release in a finally block.
See also
Subtleties of C# IL
codegen
for a very subtle case where an exception can prevent a lock from
being released even when using the lock keyword (but only in .Net 3.5 and earlier)
Locks and exceptions do not
m...
trying to align html button at the center of the my page [duplicate]
...ut using text-align on the parent div by simple using margin:auto; display:block;
For example:
HTML
<div>
<button>Submit</button>
</div>
CSS
button {
margin:auto;
display:block;
}
SEE IT IN ACTION: CodePen
...
Simulate CREATE DATABASE IF NOT EXISTS for PostgreSQL?
...ment. The manual:
CREATE DATABASE cannot be executed inside a transaction block.
So it cannot be run directly inside a function or DO statement, where it would be inside a transaction block implicitly.
(SQL procedures, introduced with Postgres 11, cannot help with this either.)
Workaround from wit...
Where is Erlang used and why? [closed]
...ng shines.
handle many connections
It is very easy to build scalable non-blocking TCP/IP servers with erlang. In fact, it was designed to solve this problem.
And given it can spawn hundreds of thousand of processes (and not threads, it's a share-nothing approach, which is simpler to design), ejabb...
Why not use exceptions as regular flow of control?
...iew (I'm pretty sure the perfomance overhead is minimal). I don't like try-blocks all over the place.
Take this example:
try
{
DoSomeMethod(); //Can throw Exception1
DoSomeOtherMethod(); //Can throw Exception1 and Exception2
}
catch(Exception1)
{
//Okay something messed up, but is it So...
Is there a vr (vertical rule) in html?
...ment can be used to separate items vertically (anything you set to display:block and float:left with any height set)
– Andy Baird
Aug 4 '09 at 17:09
20
...
How do I create a Java string from the contents of a file?
...eople don't even notice Stream has a close() method. Be sure to use an ARM-block as shown.
If you are working with a source other than a file, you can use the lines() method in BufferedReader instead.
Memory utilization
The first method, that preserves line breaks, can temporarily require memory sev...
How many concurrent AJAX (XmlHttpRequest) requests are allowed in popular browsers?
...njoy it!!!
Just because I have had problems with my hosting provider
<?php /*
Author: Luis Siquot
Purpose: Check ajax performance and errors
License: GPL
site5: Please don't drop json requests (nor delay)!!!!
*/
$r = (int)$_GET['r'];
$w = (int)$_GET['w'];
if($r) {
sleep($w);
ech...
Best way to store password in database [closed]
...ssword: Best Practices?
Is it ever ok to store password in plain text in a php variable or php constant?
To clarify a bit further on the salting bit, the danger with simply hashing a password and storing that is that if a trespasser gets a hold of your database, they can still use what are known a...