Titlebook: Concepts of Operating Systems; Colin J. Theaker,Graham R. Brookes Textbook 1993Latest edition Colin J. Theaker and Graham R. Brookes 1993

厚脸皮

Operating System Performance,ing when processing power and memory were extremely expensive commodities. Nevertheless, the behaviour of computer systems as a whole is still of great concern. In many applications, the demand for processing capability is insatiable, and the wise and efficient usage of resources is still therefore a major issue for system designers.

humectant

https://doi.org/10.1007/b138142 the segmented system, namely: (a) fragmentation and (b) a potential deadlock situation when a number of processes are being multiprogrammed, since, although all the processes have some of their segments in memory, the number may not be enough to run (or at least to run efficiently).

垄断

,Homotopie et groupoïde de Poincaré,e ‘added value’ which the network itself may provide over and above that of the processing elements themselves. The wide acceptance of international standards has accelerated this process, allowing systems from many different manufacturers to be interconnected in a coherent way.

HAIRY

漂亮才会豪华

I/O Buffering,CPU and the peripheral devices, there was a need to provide some form of buffering. In this chapter, we review the characteristics of simple buffering systems, identify their deficiencies and consider more sophisticated buffering techniques. Other forms of I/O device handling are also considered, pa

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搏斗

,Memory Management — Basic Principles,em is supporting a large number of user processes, say ., in general it is impractical to keep all of them in memory, as on average only 1/. of the store will be in use at any given instant. Apart from the process that is currently running, some processes will be waiting for a time slice and some (u

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美学

File Management,ity does not result because of the nature of the facilities provided, rather because of the need to ensure the security and integrity of the file system. It is usually this aspect of an operating system’s design which has the greatest impact on users, and which also has the greatest visibility when

investigate

,Resource Management — Deadlocks,s resources, then undoubtedly it is .most important function. At a slightly more mundane level, processes need to drive peripherals such as magnetic tape decks or exchangeable disk drives, as users want to mount their own media and have close and dedicated control of the peripherals. In this chapter