Operating System

Operating System

1. -OS functions.

   • It manages the hardware and software resources of the system. In a desktop computer, these resources include such things as the processor, memory, disk space .
   • It provides a stable, consistent way for applications to deal with the hardware without having to know all the details of the hardware.

2. -How it works?.

3. What's a OS??

   • Operatin system's is software that manages computer hardware, software resources and provides common services for computer programs,so that control all the programs of the computer.

4. Types of OS

   • Real-time
     • Responds to input instantly,general-purpose operating systems, such as DOS and UNIX, aren't real-time.
   • Multithreading
     • lows different parts of a single program to run concurrently.
   • Multitasking
     • Allows more than one program to run concurrently.
   • Multiprocessing
     • Supports running a program on more than one CPU
   • Multi-user
     • Allows two or more users to run programs at the same time.

5. OS developments

   • The computer as we know it today grew out of the Second World War, in the early 40s in those years there was not even the concept of "operating system" and programmers interacted directly with the hardware of the computers working in machine language (i.e., in binary, by programming only 0s and 1s).
     • The concept of operating system emerges in early 50 Operating System The first story was created in 1956 to an IBM 704 computer, and basically all I did was to start the execution of a program when the previous ended. In the 60s produced a revolution in the field of operating systems. Concepts like multitasking system, multiuser system, multiprocessor system and real-time system appear.
       • It is in this decade that UNIX appears, based on the vast majority of operating systems that exist today. In the 70s boom occurs within personal computers, bringing these to the general public so unthinkable before. This makes development multiply, creating the C programming language (specifically designed to completely rewrite the UNIX code).
         • As a result of this exponential growth of users, most of them without any knowledge of languages ​​low or high level, made ​​in the 80s, the priority when designing an operating system was the ease of use, arising well the first user interface.
           • In the 80 systems were born as MacOS, MS-DOS, Windows. In the 90s makes his appearance Linux, publishing the first kernel version in September 1991, which subsequently join the GNU project, a completely free operating system similar to UNIX, which lacked a functional core to run

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