[Q.41] Which condition is NOT one of Coffman's four necessary conditions for Deadlock?
The condition is 'No Preemption'. Preemption actually prevents/breaks deadlock.
[Q.42] What is a PCB (Process Control Block)?
PCB stores process state, PC, CPU registers, memory limits, and open file lists.
[Q.43] Shortest Remaining Time First (SRTF) is the preemptive version of:
SRTF preempts running process if a newly arrived process has shorter remaining burst time than current process.
[Q.44] In page-based virtual memory, what is the 'Dirty Bit' used for?
Dirty bit = 1 implies page was written to while in memory, so it must be flushed to disk upon eviction.
[Q.45] What is the main purpose of System Calls in an OS?
System calls allow user-space applications to safely invoke kernel-space routines.