design of unix operating system

Board. The test proves that the operation of the operating system in DSP chip can be tms320c6713, the reliability is guaranteed, and the real-time performance is greatly improved. At the same time, the porting method introduced in this paper has a strong universality in the same kind of DSP architecture processor, and it also has some instructive meanings to the porting of Μc/os-ⅱ

Operating System-process/thread internal communication-Critical Zone (Critical Regions), system-regions The previous article described the competition conditions between processes: multiple processes enter a shared area at the same time, resulting in data inconsistency. This article mainly describes how to solve this problem.I. Introduction to critical section To

. A file system must be installed on a block device to enter the operating system. Network devices are specially processed in Linux. Linux's network system is mainly based on BSD unix socket mechanism. A special data structure (sk_buff) is defined between the

, because like Linux and UNIX, the virtual console access mode is provided, allowing users to log on multiple times from the console at the same time. The choice of the virtual console can be achieved by pressing the Alt key and a function key, usually using the F1-F6 For example, after the user login, click the Alt-F2 key, the user can see "login:" prompt, the user sees the second virtual console. Then you just press the Alt-F1 key to go back to the

As we all know, CPU is the fastest part of the computer system, while external devices are the slowest part. There is a big difference between them. However, the CPU may always require access to peripherals. If each CPU operation has to wait for the completion of the peripherals, the valuable running time of the CPU will be greatly wasted. With the development of modern computer technology, most modern operating