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15 Cards in this Set
- Front
- Back
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Goals of an operating system |
Execute user programs, make the computer easy to use, utilize hardware efficiently |
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An OS is... |
a resource allocator and a control program |
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Kernel |
The one program running at all times on the computer |
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Bootstrap Program |
The program that loads the kernel on boot. Stored in ROM or EEPROM |
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Can I/O and CPU execute concurrently? |
Yes |
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Device Controller |
Interrupt sent by I/O device saying that it's done with an operation |
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System call |
Requests to the OS |
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Device-status table |
A table with the ID and type of all I/O devices |
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Storage Structure |
Registers -> Cache -> Memory -> HDD -> Disk |
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Caching |
Copying the information into a faster storage system |
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Multiprocessor System |
System with multiple processors. Allows increased thoroughput |
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Multiprogramming |
When a task is waiting for I/O, switch to another task |
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Timesharing |
Quickly switch between users |
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Dual-mode |
Keeps the OS safe by having a "mode bit" that keeps track of user modes and kernel modes |
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User ID |
One user ID per user as a unique identifier |
