Yes but you need to schedule for the interrupt, and you don't
necessarily know what 'current time' is at interrupt time.
So let's say you have "something" that's scheduled to run at times
- 1000
- 2000
- 3000
and free-until is 10000 or something high.
It can also happen without free-until, then it just depends which one of
the two - they're running in parallel now (linux doing time-travel
interrupt handling and adding the event, the other thing continuing to
schedule and doing the next entry) - asks the controller first.
Since they happen at the same time, most discrete event simulations make
the assumption, that the actual order of execution should not be part of
the semantics.
Although, most of the implementations demand a deterministic order (for
repetition) but even that requirement is sometimes lifted. So this is no
contradiction to common discrete event simulations.
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