Operating Systems
9 articles in this topic
fork() Questions in GATE
Trace three common fork() patterns without the off-by-one error, then handle return values, loops, printed output, and inherited buffers.
Operating System Interview Questions for Freshers: Top 50 with Answers
50 operating system interview questions for freshers, organised as follow-up chains: whiteboard-depth answers for process vs thread, context-switch cost, paging to thrashing and deadlock handling, plus quick-fire stems and a two-week plan grounded in KnowledgeGate's OS question bank.
IBPS SO IT Officer Operating Systems: professional knowledge topics
IBPS SO IT Officer Operating Systems: master processes, CPU scheduling, memory management, deadlock and process synchronization for the Mains PK paper.
File systems and disk scheduling in OS: allocation, directories and seek time
A file system is the operating system's answer to a simple-sounding question: where on the disk does each file's data actually live, and how do we find it again quickly? Disk scheduling is the follow-up: when many read and write requests are queued, in what order should the head service them so the disk arm travels least? Both are mechanical once you know the rules, and both are steady exam scorers. Let us take the file system first, then the moving arm.
Memory management in OS: paging and segmentation explained
Memory management is how the operating system decides where each process lives in physical memory and how a program's addresses get mapped to real hardware locations. Get the mapping right and many processes share one memory safely; get it wrong and you waste memory to fragmentation or crash into another process. This topic is a reliable source of numerical questions, and almost all of them come down to one skill: translating a logical address into a physical one. Let us buil
CPU scheduling algorithms: FCFS, SJF, Round Robin and priority explained
When several processes are ready to run and there is one CPU, the operating system has to choose who goes next. That choice is CPU scheduling, and the algorithm it uses decides how long each process waits and how responsive the system feels. This is the densest topic in Operating Systems for exams, and it is almost entirely mechanical once you can draw a Gantt chart and compute two numbers. Let us do exactly that, on one process set, across every algorithm you need.
Process Synchronization and Semaphores: race conditions, Peterson's solution, wait and signal
Process synchronization explained: the race condition, critical-section problem, Peterson's solution, binary and counting semaphores, and a worked trace.
Memory Hierarchy and Virtual Memory: paging, the TLB, and address translation
Memory hierarchy and virtual memory explained: registers to disk, locality, paging, page tables, the TLB, a worked address translation, and access time.
Operating Systems for GATE: How to Study Deadlocks, Scheduling and Memory
Operating Systems is one of the densest, most-tested GATE CS subjects. Here is how to study its three biggest areas (scheduling, deadlocks and memory) so the marks actually come.