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💻 Operating Systems — GATE CSE

An Operating System (OS) is the software layer between you and the hardware. It manages resources, runs programs, and keeps everything organized.

Key Topics for GATE​

1. Process Management​

  • Process vs Thread
  • Process states: New → Ready → Running → Waiting → Terminated
  • CPU Scheduling: FCFS, SJF, Round Robin, Priority

2. Memory Management​

  • Paging and Segmentation
  • Virtual Memory
  • Page Replacement: FIFO, LRU, Optimal

3. Deadlocks​

Four necessary conditions:

  1. Mutual Exclusion
  2. Hold and Wait
  3. No Preemption
  4. Circular Wait

If you break ANY one condition, deadlock cannot occur! 🔓

4. File Systems​

  • File allocation methods
  • Directory structures
  • Disk scheduling: FCFS, SSTF, SCAN, C-SCAN

Detailed notes with solved GATE questions coming soon... 📝