Scheduler Glossary

Short background notes on the general scheduling concepts the Scheduler article builds on. Each page explains the concept on its own, then closes with one line on how the Cosmos scheduler applies it. Replacing the policy itself is not a concept but a how-to: see Writing a scheduler.

Concept	Summary
Preemption	The kernel takes the CPU away on an interrupt; threads never have to volunteer
Virtual-time fair-share	Weighted CPU shares, enforced by always running the thread whose virtual clock is furthest behind
Interrupts at instruction boundaries	An interrupt lands after one instruction and before the next; nothing longer is atomic against it