Operating system principles (OSP) Principles and Labs
读史兼怀计算机时代 AL
茫茫天宇化神工，草木虫猿一脉同。
万类轮回争剩勇，千秋疆场逞英雄。
炉中铜铁刀光冷，沙里硅晶智力聪。
娲祖当年曾料否，人机别后领长风。
copy one directory using multi-threads
Add a New System Call to list processes
阅读GPL许可证，浅谈自由软件运动(free software)在新时代的价值 HW02
An operating system (OS) is system software that manages computer hardware, software resources, and provides common services for computer programs.
Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, printing, and other resources.
For hardware functions such as input and output and memory allocation, the operating system acts as an intermediary between programs and the computer hardware,although the application code is usually executed directly by the hardware and frequently makes system calls to an OS function or is interrupted by it. Operating systems are found on many devices that contain a computer – from cellular phones and video game consoles to web servers and supercomputers.
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