Operating Systems Questions

• Job queue


• Ready queue


• Device queue

Main memory - only large storage media that the CPU can access directly.

Secondary storage - extension of main memory that provides large nonvolatile storage capacity.

In Windows NT, executive refers to the operating system code that runs in kernel mode.

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.

In batched operating system the users gives their jobs to the operator who sorts the programs according to their requirements and executes them. This is time consuming but makes the CPU busy all the time.

Turnaround time is the interval between the submission of a job and its completion. Response time is the interval between submission of a request, and the first response to that request.

DDks are device driver kits, which are equivalent to SDKs for writing device drivers. Windows NT includes DDks.

Paging is solution to external fragmentation problem which is to permit the logical address space of a process to be noncontiguous, thus allowing a process to be allocating physical memory wherever the latter is available.