spooling system

Transmission DoorSpooling technology--operating systemSpooling technology (simultaneous peripheral Operating on line)At the same time, on-line peripheral operation Technology, it is about how the slow-speed character device and computer host data exchange of a technology, often referred to as spooling technology.In the multi-channel program environment, using one or two programs in the multi-channel program to simulate the function of the peripheral c

The role of spooling technology: 1, the introduction of spooling technology is toeasing the contradiction between high-speed CPUs and low-speed I/O devices;2, spooling technology can allow more than one external device for online concurrent operation,Achieve Virtual Nature;In this technology used to buffer and channel, buffer everyone is more familiar with, her

fixed area, called an "output well" (for output), or "input well" (for input), respectively, in the secondary storage. In short, it is in memory to form a buffer, in the advanced equipment to form output wells and input wells, transmission, from the low-speed equipment into the buffer, and then to the high-speed equipment input wells, and then from the high-speed equipment output wells, to the buffer, and then spread to low-speed equipment. 2, the composition of the

value is A * returned. If The directory is empty, this would return an absent option. at */ - PrivateOptionalGetNextFile () { - /*Filter to exclude finished or hidden files*/ -FileFilter filter =NewFileFilter () { - PublicBoolean Accept (File candidate) { -String FileName =candidate.getname (); in if((Candidate.isdirectory ()) -||(Filename.endswith (completedsuffix)) to|| (Filename.startswith (".")) +||Ignorepattern.matcher (FileName). Matches ()) {

respective advantages and disadvantages. 13. Dynamic and Static links. 14. Basic paging and request paging storage management methods. 15. Basic Segmentation and request segmentation storage management methods. 16. Compare the advantages and disadvantages of the multipart paging mode. 17. Several Page Replacement algorithms calculate the number of pages to change. (How is the LRU application implemented ?) 18. Virtual Memory definition and implementation method. 19. Four features of the

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Devices Device I/O methods: inquiry, channel, and interruption I/O device allocation algorithm: first-come first-served (FCFS), allocation by priority 3. device management technology (1) I/O setting cache reasons Resolve the inconsistency between the arrival rate and departure rate of information; Cache acts as a transfer station; So that the information entered at one time can be used multiple times; You can set local registers in the channel or controller as the buffer memory to store I/O inf

users to use the computer to provide a good operating environment of a system software.2, the role of the operating system(1) Improve the efficiency of computer system through resource management;(2) To improve the human-machine interface, to provide users with a friendly working environment;3, the operating system fe

refers to the devices that are required to be allocated based on the user's I/O requests. The general principle of allocation is to give full play to the efficiency of the use of equipment, as far as possible to keep the equipment busy, but also to avoid due to unreasonable allocation method caused by process deadlock. Device features, the following three ways of using the device are called exclusive devices, shared devices and virtual devices. Spooling