Protect the thinker list in a map against changes during iteration/thinking.
While the list is frozen, additions and removals are not done. Only afterthe freeze ends will the added thinkers be added and removed thinkersremoved.
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Protect the thinker list in a map against changes during iteration/thinking.
While the list is frozen, additions and removals are not done. Only after
the freeze ends will the added thinkers be added and removed thinkers
removed.