Filipe Varjão filipevarjao

Proposal: Eliminate STW stack re-scanning

Author(s): Austin Clements, Rick Hudson

Last updated: 2016-10-18

Discussion at https://golang.org/issue/17503.

Abstract

When does terminate/2 get called in a gen_server?

This is what the [official documentation][1] says about the terminate/2 callback for a gen_server:

This function is called by a gen_server when it is about to terminate. It should be the opposite of Module:init/1 and do any necessary cleaning up. When it returns, the gen_server terminates with Reason. The return value is ignored.

Reason is a term denoting the stop reason and State is the internal state of the gen_server.

Reason depends on why the gen_server is terminating. If it is because another callback function has returned a stop tuple {stop,..}, Reason will have the value specified in that tuple. If it is due to a failure, Reason is the error reason.

Add Git Branch Name to Terminal Prompt (Linux/Mac)

Open ~/.bash_profile in your favorite editor and add the following content to the bottom.

# Git branch in prompt.

parse_git_branch() {

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

-E: will describe the underlaying queries of the \ commands (cool for learning!)
-l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

	If you are facing an error like that on new MacOS version.

	xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun

	It means that you need to install XCode command line, open a Terminal and run this command:

	$ xcode-select --install

	Note:
	If you want to download and install Command Line tools manually, it can be downloaded from: https://developer.apple.com/download/more/

	#!/bin/bash
	#Autor: Emiliano Carlos de Moraes Firmino
	#Comentario: igual a usar "sar -A 1", mas sem a interface de rede
	# que não abre no kSar

	#Script Variables
	output_file="sar_data.txt" #arquivo de saída
	interval=1 #taxa de amostragem em segundos

	#Inicia rodada de testes

	These commands are based on a askubuntu answer http://askubuntu.com/a/581497
	To install gcc-6 (gcc-6.1.1), I had to do more stuff as shown below.
	USE THOSE COMMANDS AT YOUR OWN RISK. I SHALL NOT BE RESPONSIBLE FOR ANYTHING.
	ABSOLUTELY NO WARRANTY.

	If you are still reading let's carry on with the code.

	sudo apt-get update && \
	sudo apt-get install build-essential software-properties-common -y && \
	sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && \

	class List extends Object {
	List() { super(); }
	List append(List l) {
	return this; // dummy
	}
	}

	class Nil extends List {
	Nil() { super (); }

	package main

	import "fmt"

	type Node struct {
	prev *Node
	next *Node
	key interface{}
	}