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1615037
Operating Systems
Descrição
Mapa Mental sobre Operating Systems, criado por Nicholas Hurdman em 10-11-2014.
Mapa Mental por
Nicholas Hurdman
, atualizado more than 1 year ago
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Criado por
Nicholas Hurdman
mais de 9 anos atrás
13
1
1
Resumo de Recurso
Operating Systems
User Interface
A user interface is the communication between the computer and the user
Operating systems need to provide a means of communicating with them.
This means making it possible for the user to issue commands
Memory management
The essential requirement of memory management is to provide ways to dynamically allocate portions of memory to programs at their request
When a program is running it must be in the computer’s main memory (RAM). The main memory has a finite size.
The operating system must manage where in memory the programs will go
Peripheral Management
Peripherals are any computer hardware components that are not part of the CPU i.e. Input, Output or Storage devices.
A function of the operating system is to manage these devices
he operating system may need to find / ask user to install suitable drivers for the device to work
Security
Operating systems usually allow the authentication of users, i.e. they can be set up to check that users are who they say they are.
This normally involves users having user ids and password
Operating systems also handle file privileges, these are right assigned to users and group
Multi-tasking
Most systems commonly have several programs loaded into memory at the same time.
he operating system will also be running lots of background tasks just to manage the computer itself
A processor can only execute one instruction at a time (assuming it only has one core)
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