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The XNU scheduler: bands, QoS, and how Mach decides who runs
Real-time, fixed-priority, timeshare, idle — four scheduling classes, 128 priorities, and a QoS layer on top. Here's how XNU picks a thread to put on a core.
machschedulerqoskernel
Mach ports: how every macOS process actually talks to another
Tasks, ports, messages, and rights — the IPC primitive that quietly carries every IPC on your Mac, from XPC to drag-and-drop.
machipckernelxnu