Computer software development process

Logic design software

Problems understood
clearly problems input and output requirements
Algorithm design
including software architecture design, the modular decomposition, selecting a particular algorithm strategy, described in a suitable manner and stepwise refinement algorithm steps
Data structure design
on the one hand you want to select or design can effectively represent data structures stored data objects and application issues involved, but also select the data structures or algorithms designed to support policy implementation

Algorithm analysis
found the perfect place to improve returns to the second step, re-select or design algorithms and data structures
Programming
design of specific data storage access solutions, data structures, implementation details, the implementation details of the design process based on some operating systems, debug and run programs on your computer.
Program realization
in some computer programming language, define data structures, data storage, based on an operating system to write code that implements the algorithm, debug and compile the code and run the program on your computer, and optimize programming.

It used to store data to be processed, such as maze map
The algorithm used to implement policies, such as the example to explore the maze increment array direction, backtracking stack, or an array of special signs to avoid duplicate mark to go)

Algorithm design is to study various methods of operation of various types of data structures to solve computational problems

按照一定的算法把处理机分配给进程（线程），并对其进行有效的管理和控制。
进程控制
进程控制的主要功能是为作业创建进程、撤消已结束的进程，以及控制进程在运行过程中的状态转换。
进程调度
操作系统内的进程运行需经调度才能执行完成，即把CPU分配给哪个进程使之运行
进程同步
进程同步的主要任务是为多个进程的运行进行协调。
进程同步的两种协调方式
进程互斥方式，这是指诸进程（线程）在对临界资源进行访问时，应采用互斥方式；
进程同步方式，指进程相互合作去完成共同的任务时，诸进程之间的协调
进程通信
进程是指进程之间的信息交换。
进程通信方式
机器内
机器间

Memory Management

The user interface

依赖操作系统的程序编译方式
Do not rely on the operating system compiled by: cross-platform development
JAVA language is cross-platform language, JAVA virtual machine JVM is not cross-platform

After the data structure is determined, one of the main software: structured data management operations
CRUD, CRUD
Manual management
File system
Database Systems
Database Management System referred DBMS
SQL language
Distributed Database DDBS
(Distributed the DBS)
technology is crystalline product DB and network technology, communication technology.
Its characteristics are:
processing data dispersed on each node, each node of the data by the local DBMS management, among the nodes can
share data
full use of advantage of resources each node, reduce the network load