General Features of Operating Syste

General Features of Operating Systems

An operating system is a master control program which controls the functions of the computer systemas a whole and the running of application programs. All computers do not use the same operating systems. Some software being only designed to run under the control of specific operating systems, it is important to assess the operating system used on a particular model before initial commitment. Some operating systems are adopted as “industry standards” and these are the ones which should be evaluated because theynormallyhave a good software base. The reason for this is that software houses are willing to expand resources on the development ofapplicationpackages for machines functioning under the control of an operating system which is widely used. The cost of software could belowerin such circumstances as the development costs are spread over a greater number of users, both actual and potential.

Mainframe computers usually process several application programs concurrently switching from one to the otherfor the purpose of increasing processing productivity. This is known as multiprogramming (multi-tasking in the context of microcomputers), which requires a powerful operating systemsincorporatingwork scheduling facilities to control the switching between programs. This entails that data are read for one program while the processor is performing computations on another and printing out results on yet another.

In multi-user environments an operating system is required to control terminal operations on a shared access basis as only one user can access the system at any moment of time. The operating system allocates control to each terminal in turn. Such systems also require a system for record locking and unlocking, to preventone user attempting to read a record whilst another user is updating it, for instance. The first user is allocated control to write to a record (or file in some instances) and other users are denied access until the record is updated and unlocked.

Some environments operate in concurrent batch and real-time mode. This means that a “background” job deals with routine batch processing whilst the “foreground” job deals withreal-time operations such as airline seat reservations, on-line booking of hotel accommodation, or control of warehouse stocks, etc. The real-time operation has priority, and the operating system interrupts batch processing to deal with real-time inquiries or file updates. The stage of batch processing attained at the time of the interrupt is temporarily transferred to backing storage. After the real-time operation has been dealt with, the interrupted program is transferred back tointernalmemory from backing storage. And processing recommences from a “restart” point. The operating system also copies to disk backing storage the state of the real-time system every few minutes (periodic check points) to provide a means of recovering the system in the event of a malfunction.

An operating system is stored on disk and has to be booted into the internal memory (RAM) where it must reside throughout processing so that commands are instantly available. The operating system commands may exceed the internal memory capacity of the computer in which case only that portion of the OS which is frequently used is retained internally, other modules being read in from disk as required. Many microcomputers function under the control of a disk operating system known as DOS.

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Общие характеристики операционных системОперационная система-это программа управления, которая контролирует функции компьютера systemas в целом и выполнение прикладных программ. Все компьютеры не используют же операционные системы. Некоторые программы, которые предназначены только для запуска под управлением определенных операционных систем, важно оценить операционной системы, используемой на конкретной модели до первоначального обязательства. Некоторые операционные системы принимаются как «отраслевые стандарты» и это те, которые должны быть оценены, потому что theynormallyhave хорошее программное обеспечение базы. Причиной этого является, что программное обеспечение дома готовы расширить ресурсы на развитие ofapplicationpackages для машин, работы под управлением операционной системы, которая широко используется. Стоимость программного обеспечения может belowerin такие обстоятельства, как развитие, расходы на распространение большего числа пользователей, как фактических, так и потенциальных.ЭВМ обычно обрабатывают несколько прикладных программ, одновременно переход от одного к otherfor цели повышения производительности обработки. Это называется мультипрограммированной, (multi-tasking в контексте микрокомпьютеры), который требует мощной работы systemsincorporatingwork планирования объектов для управления, переключение между программами. Это предполагает, что данные считываются для одной программы, в то время как процессор выполняет вычисления на другой и печать результатов на еще один.In multi-user environments an operating system is required to control terminal operations on a shared access basis as only one user can access the system at any moment of time. The operating system allocates control to each terminal in turn. Such systems also require a system for record locking and unlocking, to preventone user attempting to read a record whilst another user is updating it, for instance. The first user is allocated control to write to a record (or file in some instances) and other users are denied access until the record is updated and unlocked.Some environments operate in concurrent batch and real-time mode. This means that a “background” job deals with routine batch processing whilst the “foreground” job deals withreal-time operations such as airline seat reservations, on-line booking of hotel accommodation, or control of warehouse stocks, etc. The real-time operation has priority, and the operating system interrupts batch processing to deal with real-time inquiries or file updates. The stage of batch processing attained at the time of the interrupt is temporarily transferred to backing storage. After the real-time operation has been dealt with, the interrupted program is transferred back tointernalmemory from backing storage. And processing recommences from a “restart” point. The operating system also copies to disk backing storage the state of the real-time system every few minutes (periodic check points) to provide a means of recovering the system in the event of a malfunction.An operating system is stored on disk and has to be booted into the internal memory (RAM) where it must reside throughout processing so that commands are instantly available. The operating system commands may exceed the internal memory capacity of the computer in which case only that portion of the OS which is frequently used is retained internally, other modules being read in from disk as required. Many microcomputers function under the control of a disk operating system known as DOS.