types of operating system

. Asynchronous and concurrent execution of multiple programs brings two types of uncertainty. One is that the execution speed and time of each program (process) are uncertain, and the sequence of advancing between each program (process) is also uncertain. It is unpredictable. The other is that the execution results of each program (process) are uncertain, that is, the same program is given with the same initial conditions and executed multiple times i

[Strongly recommended operating system, desktop system size: 640KB] -- Linux general technology-Linux technology and application information. The following is a detailed description. Menuet It should be known by many people. It is very good to install it in a floppy disk as a backup system! Supports TCP and other n

Unix system introduction, unix Operating System I. Basic Knowledge 2. solaris installationReference: http://wenku.baidu.com/link? Url = install the Solaris10 ZF6WHQdnzOGc1why-ke86hU6JQfgsvjHP2s7Vek1AAFeu1aY_QmKPlovF2e7F-L94I7pG4yMEOhN5s5mxYuMfhspo_5g9pcWMOHVzJi9USy under the http://wenku.baidu.com/link Virtual Machine? Url = installation _ Virtual Machine insta

今天发现2012的操作系统远程桌面黑屏了，重启后发现只能看到CMD命令行。感觉是WINDOW的版本变成了无GUI的版本了。windows 2012 R2系统重启后进入系统还是只有CMD命令窗口，没有图形化界面，除了cmd其余的全部是黑的。解决这个方法很简单，不用重装系统，只需cmd里面一条命令即可。在cmd里面输入以下内容，输入完以后按回车键Dism/online/enable-feature/all/featurename:servercore-fullserver/featurename:server-gui-shell/featurename: Server-gui-mgmt按回车键以后什么都不用关，过一会系统就会自动重启，重启完以后进入系统就是图形化界面了。直接再CMD命令行输入上面的dism的相关命令，如：During the execution of the process, there will be a progress bar that automatically goes down.Finally, you are prompted to restart. We f

Ransomware virus in OS X system security risks of operating system X Mac hard disk being encrypted by hackers In the past, the security of OS X systems often gave users a sense of reliability and stability. However, with the increase in Mac user base and the increase in OS x information value, OS X has gradually become the target of hacker attacks in recent year

), the transfer time (the time it takes to read or write data from the disk).Disk scheduling algorithm (decision to find time): First come first service algorithm FCFS, the shortest time to find the first algorithm SSTF, scanning algorithm scan, cyclic scanning algorithm c-scan. bootloader: An initialization program that needs to be run when the computer starts.Boot control block: Includes information required by the system to boot the

creating too many processes.When a process is created, the initialization data (or input) is passed to the child process by the parent process, in addition to the various physical and logical resources.When a process creates a new process that is created, there are two possible types of executions: The parent process executes concurrently with the child process The parent process waits until one or all of the child processes have finishe

importantly, the fork "init" process to start the entire multi-task environment.We can add some specific content in init.(2) device drivers: Device Drivers occupy a large part of the Linux kernel. Like other operating systems, device drivers provide interfaces for the hardware devices and operating systems they control.In chapter 4, we will explain how to write the driver separately.(3) file

Operating system five major management functions, namely, job management, storage management, information management, equipment management and processor management. These management tasks are carried out by a large and complex set of procedures.Job management solves the problem of who is allowed to use the computer and how to use it.Storage management solves the problem of allocating, protecting, and expand

system, can only be applied to Apple's own production equipment, so the application surface is narrower. But because of the good sales performance of ipad and Apple's notebooks now, the use of the crowd also has a considerable scale. Its operation is very convenient, the user experience is quite perfect, but its application surface is much narrower.In the peace talks on the mobile phone operating

operating system that can be installed and run on a microcomputer, workstation, or mainframe to a giant computer. From the perspective of hardware development, the batch processing operating system, time-based operating system, a

The Birth and Development of Linux Linux is a clone system of UNIX operating systems. It was first officially announced in 1991, October 5 ). With the help of Internet networks and the joint efforts of computer enthusiasts around the world, it has become the most widely used UNIX operating system in the world today, a

In the field of information security, the industry is paying more and more attention to the security of server operating systems as attack technologies continue to upgrade and data leakage incidents surge. This article introduces two security operating system solutions starting with the study of the classified protection security

Embedded Operating System (wince) 1 Introduction to the embedded operating system Windows CE. netWindows CE. Net is a successor to Windows CE 3.0. Windows CE. NET is re-designed for the embedded market and provides a robust real-time operating

When learning about Linux, you may encounter a Linux partition problem. Here we will introduce the solution to the Linux operating system problem. Here we will share it with you. Boot Solaris 10, Linux, and Microsoft Windows on a portable computer. One of my initial tasks was to configure my laptop to boot multiple Solaris, Linux, and Microsoft Windows operating

four basic features of concurrency, sharing, virtualization, and uncertainty.The operating system can be broadly divided into 6 types.① single operating system. ② time-sharing system. ③ Real-time

least a single thread. Of course, a complex process such as word can have multiple threads, multiple threads can execute simultaneously, multithreading is performed the same way as multiple processes, and the operating system quickly switches between multiple threads, allowing each thread to run briefly alternately, seemingly as if it were executing concurrently. Of course, a multi-core CPU is required to

This blog for my own summary of relevant knowledge written, if there is similar, purely coincidental. The I/O system structure is categorized as follows: External memory Device controller: CD, tape, disk; Output device controller: CRT, laser printer, line printer, dot-matrix printer, color printer, speaker; Process controller: Process Control I/O equipment; Communication controller: Data communication equipment; Input device controller: keyboard, mous

Improve Linux operating system performance 2011-01-05 13:48 Anonymousfont Size:T | T This article explains in detail how to tune Linux system performance from disk, file and file system, memory and compilation. The tuning method provided in this article can improve the performance of Linux systems to varying degrees,

waits for your input to be read.C ShellBill Joy developed the C shell at the University of California in Berkeley in the early the 1980s. It is primarily intended to make it easier for users to use interactive features and to turn the grammatical structure of the ALGOL style into a C language style. It adds features such as command history, aliases, file name substitution, job control, and more.Korn ShellFor a long time, there were only two types of