Deterministic scheduling #8
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…ell (pid 0) each time. blocking shells cause their dependencies to step, but every shell gets to step exactly once per round.
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Most of #1 has been implemented: symbolic mode schedules processes in PID (i.e., creation) order, using demand to step processes early. (Now that we step EVERYONE, there's less of a reason to use demand at all. Things will definitely simplify if we pull that out, but then our schedules are just a bit more rigid.)
There are a bunch of other improvements listed in #1.