Mike Yuan
ad6b84d960
Subscribe() enables full signal delivery on API bus. But aside from that, if a unit/job is explicitly Ref()'d, manager also emits the signal. See bus_foreach_bus() for details. bus-wait-for-units refs every unit to wait for, so there's no need to Subscribe() on top of that. In verb_clean_or_freeze() Subscribe() is not called either.
System and Service Manager
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