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6 parça ders notları
İşletim sistemleri, bellek ve işlemci organizasyonu hakkında.

Chapter 1
Introduction to Operating Systems
1.1 General Definition
An OS is a program which acts as an interface between computer system users and the
computer hardware. It provides a user-friendly environment in which a user may easily
develop and execute programs. Otherwise, hardware knowledge would be mandatory for
computer programming. So, it can be said that an OS hides the complexity of hardware from
uninterested users.
In general, a computer system has some resources which may be utilized to solve a
problem. They are
• Memory
• Processor(s)
• I/O
• File System
etc.
The OS manages these resources and allocates them to specific programs and users. With
the management of the OS, a programmer is rid of difficult hardware considerations. An OS
provides services for
• Processor Management
• Memory Management
• File Management
• Device Management
• Concurrency Control
Another aspect for the usage of OS is that; it is used as a predefined library for hardwaresoftware
interaction and this is why, system programs apply to the installed OS since they
cannot reach hardware directly.

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