It is now possible to define whether tasks are executed immediately or put
on the event queue of the worker thread. If task execution is in automatic
mode and the current executing thread is a worker thread, the
Task->execute method is called immediately.
This allows tasks to be posted from within worker threads. This is
intended to be used when purging of stale persistent connections and
printing diagnostic output via MaxAdmin. All of these actions are done
from within a worker thread.
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