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REAL TIME PROGRAMMING, Part II

• ordinary scheduling runs threads in "time-share" mode, trying to find a balance between I/O bound and compute bound programs.
• completely fails for realtime programming: threads processing audio/MIDI must run whenever they need to (whenever I/O is possible).

THINGS THAT DELAY THREADS

• other threads running
• waiting for unrequested disk I/O (page fault handling)
• waiting for requested disk I/O
• blocked on some condition (kernel/user space locks + semaphores)
• IRQ's blocked