* Vladimir Davydov <vdavydov.dev@xxxxxxxxx> [18/07/27 16:55]:
This is a prerequisite for switching scheduler-worker communication from
pthread mutex/cond to cbus, which in turn is needed to generate and send
deferred DELETEs from workers back to tx (#2129).
After this patch, pending tasks will be leaked on shutdown. This is OK,
as we leak a lot of objects on shutdown anyway. The proper way of fixing
this leak would be to rework shutdown without atexit() so that we can
use cbus till the very end.
Needed for #2129
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