preemptive multitasking

[Logic Lord]

What exactly is the low-level operation of pre-emptive multitasking? As I
currently understand it, the process is given a fixed number of clocks
before being forcefully taskswitched.. allowing the kernel better control
over the behaviour of running applications.. This may be totally wrong.. if
it isn't, though, my next question would be: what mechanism is used for the
timing of however many clock cycles? Is it simply the PIT channel 2 on
interrupt 8?


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