Memory Management

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Segment provides multiple address spaces

Address space may not be of same size

Maintained in the segment descriptor table

PROGRAM sequence of machine instructions stored in main memory and executed by CPU

store data in the register

compute sum of two values

push or pop values from stack

PROCESS/TASK is set of resources created and maintained by the O/S to execute the program

PROCESS containes

program with initial code and data

private address space (actually virtual address pointing to the physical address)

system resources

unique identifier called PID

register info about the process

stack about the variables

States of a PROCESS

running, blocked, ready

Segmentation

PROGRAM