DanielThomas

import java.time.Duration;
import java.util.List;
import java.util.concurrent.locks.ReentrantLock;
import java.util.stream.IntStream;
import java.util.stream.Stream;

/**
 * Demonstrate potential for deadlock on a {@link ReentrantLock} when there is both a synchronized and
 * non-synchronized path to that lock, which can allow a virtual thread to hold the lock, but
 * other pinned waiters to consume all the available workers. 

ScribbleGhost

Getting file names in a batch script

Remember:

• Replace double precentages with single precentage if you want to use it in CMD directly.
• When file names are printed out, they already include double quotes.

@echo off

lnattrass

import sys
import pprint
import struct
import socket
import ssl
from time import sleep 

# Standard "HELLO" message for TDS
prelogin_msg = bytearray([      0x12, 0x01, 0x00, 0x2f, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x1a, 0x00, 0x06, 0x01, 0x00, 0x20,
                                0x00, 0x01, 0x02, 0x00, 0x21, 0x00, 0x01, 0x03, 0x00, 0x22, 0x00, 0x04, 0x04, 0x00, 0x26, 0x00,

pokev25

# Install tmux 2.8 on Centos

# install deps
yum install gcc kernel-devel make ncurses-devel

# cd src
cd /usr/local/src

# DOWNLOAD SOURCES FOR LIBEVENT AND MAKE AND INSTALL
curl -LO https://github.com/libevent/libevent/releases/download/release-2.1.8-stable/libevent-2.1.8-stable.tar.gz

kevinchappell

parse_git_branch() {
  git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/(\1)/'
}
PS1='${debian_chroot:+($debian_chroot)}\[\033[1;31m\]\u\[\033[1;37m\]@\[\033[1;32m\]\h\[\033[1;37m\]:\[\033[1;36m\]\w \[\033[1;35m\]$(parse_git_branch) \[\033[1;33m\]\$ \[\033[0m\]'

readysetawesome

export PS1='$(git branch &>/dev/null; if [ $? -eq 0 ]; then \
echo "\[\e[0;32m\][GIT: \[\e[0;31m\]$(basename `pwd`); \[\e[0;33m\]$(git branch | grep ^*|sed s/\*\ //) \
$(echo `git status` | grep "nothing to commit" > /dev/null 2>&1; if [ "$?" -eq "0" ]; then \
echo "\[\e[0;32m\]clean"; else \
echo "\[\e[0;31m\]dirty"; fi)\[\e[0;32m\]] \$ "; else \
echo "\[\e[0;31m\][\w]\[\e[m\] \$ "; fi) \[\e[0m\]'

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

jmar71n

#!/bin/bash

### ABOUT: See: http://gist.github.com/366269
### Runs rsync, retrying on errors up to a maximum number of tries.
### On failure script waits for internect connection to come back up by pinging google.com before continuing.
###
### Usage: $ ./rsync-retry.sh source destination
### Example: $ ./rsync-retry.sh user@server.example.com:~/* ~/destination/path/
###
### INPORTANT: