make Miri's scheduler proper round-robin #2197
Merged
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When thread N blocks or yields, we activate thread N+1 next, rather than always activating thread 0. This should guarantee that as long as all threads regularly yield, each thread eventually takes a step again.
Fixes the "multiple loops that yield playing ping-pong" part of #1388.
@cbeuw I hope this doesn't screw up the scheduler-dependent tests you are adding in your PR.