Operating Systems Questions

Distributed systems work in a network. They can share the network resources, communicate with each other.

A real time process is a process that must respond to the eventswithin a certain time period. A real time operating system is an operating system that can run realtime processes successfully.

Transferring the control from one process to other process requires saving the state of the old process and loading the saved state for new process. This task is known as context switching.

1. Mutual exclusion (where at least one resource is non-sharable)

2. Hold and wait (where a process holds one resource and waits for other resource)

3. No preemption (where the resources can’t be preempted)

4. Circular wait (where p[i] is waiting for p[j] to release a resource. i= 1,2,…n

j=if (i!=n) then i+1

else 1 )

Distributed systems work in a network. They can share the network resources,communicate with each other.

It is the transfer of sufficient amount of the state of process from one machine to the target machine.

Hardware device that maps virtual to physical address. In MMU scheme, the value in the relocation register is added to every address generated by a user process at the time it is sent to memory.

->The user program deals with logical addresses; it never sees the real physical addresses

It does not have the features like

1. ability to support multiple processors


2. virtual storage


3. source level debugging