Task Scheduler

CPU time allocation and task execution order

Overview

The scheduler determines which task executes at any given time, ensuring fair CPU sharing among competing tasks.

Scheduling Algorithms

Round-Robin

Each task gets fixed time quantum
Tasks are queued circularly
Fair distribution across ready tasks

Priority-Based

Higher priority tasks execute first
Within same priority, round-robin applies
Allows real-time task guarantees

Scheduling Events

✓ Timer interrupt triggers context switch
✓ I/O blocking causes task yield
✓ Task completion removes from queue
✓ New task creation adds to ready queue

Key Takeaways

✓ Fair CPU time distribution
✓ Priority-based task selection
✓ Timer-driven context switching
✓ I/O blocking support
✓ Prevents CPU starvation