Shared Flashcard Set

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os1.3
fdsafds
5
Aviation
4th Grade
06/07/2009

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Cards

Term
What does Virtual memory allow?
Definition
a job to run while not completely in memory and to run programs that are larger than physical memory.
Term
Modern OS's are ________ driven?
Definition
interrupt
Term
Which two operating modes are, at the very least, required to ensure proper executing of the OS?
Definition
user mode
kernel mode
(supervisor, system, privileged)
mode bit indicates which mode it is in.
kernel(0) user (1)
Term
When a process executes a system call, what mode is the system in?
Definition
Kernel mode
Term
What can we use to prevent a user program from returning control to the OS?
Definition
When stuck in an infinite loop, or failing to call system services. We can fix this by using a timer – set to interrupt the computer after a specified period
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