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CODE FARM

Intro to .NET (Core)

07 Apr 2018

.NET .NET is a free, cross-platform, open source developer platform for building many different types of applications. With .NET, you can use multiple languages, editors, and libraries to build for web, mobile, desktop, gaming, and IoT. .NET Framework/.NET Core/Mono (Xamarin) C#/VB.NET/F# Assembly/DLL/MSIL Common Language Runtime (CLR) GC/JIT CoreCLR Base Class...
Introduction to Linux

06 Apr 2018

1. Multics/Unix Multics an influential early time-sharing operating system MIT, GE, Bell Labs Unix Ken Thompson The designer and implementer of the original Unix Since 2006, Thompson has worked at Google, where he co-invented the Go programming language. C and Unix Dennis Ritchie: the creator of the C programming language...
Setup Docker Engine on Centos Offline

30 Mar 2018

Let’s run a container with the command docker run --rm -it centos:7 bash as our operating environment. $ docker run --rm -it centos:7 bash [root@89b94344d402 /]# Use the following command to setup the docker stable repository. [root@5879a18a8be4 ~]# curl -sSL https://download.docker.com/linux/centos/docker-ce.repo -o /etc/yum.repos.d/ Use the yum list docker-ce --showduplicates |...
Unix Internals: The New Frontiers

03 Feb 2018

进程与内核 2.1 简介操作系统的主要功能是为用户程序（应用程序）提供可以运行的执行环境。这包括程序的执行定义的一个基本框架，并提供一整套服务（例如文件管理和I/O）和这些服务的接口（interface）。 UNIX 应用程序环境包含一个基本抽象——进程（process）。进程 (process) 地址空间 (address space) 指令系列进程控制点 (control point) 程序计数器 (program counter, PC) 硬件寄存器多个控制点 [线程 (thread)] UNIX 系统是一个多道编程环境（multiprogramming environment），即几个进程可以并发地在系统中活动。多道编程环境 (multiprogramming environment) 虚拟机 (virtual machine) 寄存器内存 I/O 进程的地址空间是虚拟的，并且通常只有部分地址空间与物理内存的位置对应。进程(虚拟)地址空间物理内存磁盘交换区 (swap area) 存页 (page, 固定大小的块) 每个进程都有一组寄存器，对应于实际的硬件寄存器。系统中会有很多活动进程，但只有一组硬件寄存器。内核将当前正在运行的进程的寄存器内容保存到硬件寄存器中，而将其他进程的寄存器内容保存在每个进程的数据结构中。进程之间会争用系统的各类资源，如处理器（又称中央处理器或 CPU），内存和外围设备。...
Calling Convention in x86 Assembly

23 Dec 2017

Registers Modern (i.e 386 and beyond) x86 processor have eight 32-bit general purpose registers, as decipted in following Figure. The register names are mostly hsitorical. For example, EAX used to be called accumulator since it was used to by a number of arithmetic operations, and ECX was known as the...
Understanding the Linux Kernel 02

26 Nov 2017

对枯燥的事情有所坚持—耗子 2.1 Memory Addresses Programmers casually refer to a memory address as the way to access the contents of a memory cell. But when dealing with Intel 80x86 microprocessors, we have to distinguish among three kinds of addresses: Logical address Included in the machine language instructions to specify the address...
Cloudera ODBC Driver for Impala on Debian/Linux with .NET

16 Nov 2017

1 What is ODBC? Open Database Connectivity (ODBC) is a standard software API specification for using database management system (DBMS). ODBC is independent of programming language, database system and operating system. ODBC was created by the SQL Access Group and first released in September, 1992. ODBC is based on the...
Understanding The Linux Kernel 01

12 Nov 2017

对枯燥的事情有所坚持—耗子 Linux is a member of the large family of Unix-like operating system. Linux was initially deveoped by Linus Torvalds in 1991 as an operating system for IBM-compatible personal computers based on the Intel 80386 microprocessor. Technically speaking, Linux is a true Unix kernel, although it is not a full...
Get Docker CE for Debian

09 Sep 2017

Install using the repository Before you install Docker CE for the first time on a new host machine, you need to set up the Docker repository. Afterward, you can install and update Docker from the repository. Set up the repository Update the apt package index: $ sudo apt-get update Install...
Deploy MongoDB with Docker

08 Sep 2017

0. Prerequisites Make sure you have already installed both Docker Engine and Docker Compose. You don’t need to install MongoDB, as it’s provided by Docker image. 1. Start a MongoDB Instance. $ docker run -d -p 27017:27017 --name db mongo:3 2. Start a MongoDB Instance with Access Control. $ docker...
Get Docker CE for CentOS

20 Jul 2017

Get Docker CE for CentOS # 1. Install required packages. $ sudo yum install -y yum-utils device-mapper-persistent-data lvm2 # 2. Use the following command to set up the stable repository. $ sudo yum-config-manager \ --add-repo \ https://download.docker.com/linux/centos/docker-ce.repo # 3. Update the yum package index. $ sudo yum makecache fast #...
Reflection in Go Language

10 Jul 2017

Go provides a mechnism to update variables and inspect their values at run time, to call their mehtods, and to apply the operations intrinsic to their representation, all without their types at compile time. This mechnism is called reflection. reflect.Type and reflect.Value Reflection is provided by the reflect package. It...
Testing in Go Language

01 Jul 2017

Go’s approach to testing relies on one command, go test, and a set of conventions for writing test functions that go test can run. It is effective for pure testing, and it extends naturally to benchmarks and systematic examples for documentation. The go test Tool The go test subcommand is...
Packages and the Go Tool in Go Language

24 Jun 2017

The purpose of any package system is to make the design and maintenance of large programs pratical by grouping related features together into units that can be easily understood and changed, independent of the other packages of the program. This modularity allows packages to be shared and reused by different...
Concurrency with Shared Variables in Go Language

17 Jun 2017

In a sequential program, that is, a program with only one groutine, the steps of the program happen in the familiar execution order determined by the program logic. For instance, in a sequence of statements, the first one happens before the second one, and so on. In a program with...
Goroutines and Channels in Go Lanugage

11 Jun 2017

Go enables two styles of concurrent programming, communicating sequential processes and shared memory multithreading. Goroutines and channels, which support communicating sequential processes or CSP, a model of concurrency in which values are passed between independent activities (goroutines) but variables are for the most part confined to a single activity. Goroutines...

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