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What is a semaphore?
...er person might enter.
It's simply a way to limit the number of consumers for a specific resource. For example, to limit the number of simultaneous calls to a database in an application.
Here is a very pedagogic example in C# :-)
using System;
using System.Collections.Generic;
using System.Text;
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How do I delete an exported environment variable?
Before installing gnuplot, I set the environment variable GNUPLOT_DRIVER_DIR = /home/gnuplot/build/src . During the installation, something went wrong.
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How to fix SSL certificate error when running Npm on Windows?
...orporate firewall under Windows - it's not fun. I'll try and keep this platform agnostic/aware where possible.
HTTP_PROXY & HTTPS_PROXY
HTTP_PROXY & HTTPS_PROXY are environment variables used by lots of software to know where your proxy is. Under Windows, lots of software also uses your OS...
Rails formatting date
I am posting a date to an API and the required format is as follows:
4 Answers
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Rails: FATAL - Peer authentication failed for user (PG::Error)
...rmed creating the database, user, password and set these privileges. Don't forget host: localhost.
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How to change language settings in R
...his changes the Lang temporarily(during the R session). To change it once for all , you need to add the environment variable to your system, and relaunch RStudio so thistake effect.
– agstudy
Dec 1 '12 at 15:51
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How can I drop all the tables in a PostgreSQL database?
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Version for not public schemas: select 'drop table if exists "' || schemaname || '"."' || tablename || '" cascade;' from pg_tables where schemaname = 'user_data';
– ludwig
Sep 16 '16 at 14:...
Tools for JPEG optimization? [closed]
...sslessly optimize JPEGs that I could integrate into our build environment? For PNGs I'm currently using PNGOUT , and it generally saves around 40% bandwidth/image size.
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Django class-based view: How do I pass additional parameters to the as_view method?
... Just curious, when/where is this "self.kwargs" populated ? I am looking for the base class function where this is set .
– binithb
Nov 23 '15 at 16:57
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Send email using the GMail SMTP server from a PHP page
...d to include @gmail if you have the server specified. Just type myaccount for username.
– Jack
Apr 16 '12 at 6:08
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