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Exclusion was generating a new Task every time a lock was contended. That results in thousands of empty Task objects which contain a single Task item. Get rid of ExclusionState. Exclusion is now a simple weak_ptr to a Task. If the weak_ptr is expired, the Exclusion is unlocked. If the weak_ptr is not expired, it points to the Task which owns the Exclusion. try_lock now appends the Task attempting to lock the Exclusion directly to the owning Task, eliminating the need for Exclusion to have one. This also removes the need to call insert_task separately, though insert_task remains for other use cases. With no ExclusionState there is no need for a string argument to Exclusion's constructor, so get rid of that too. Signed-off-by: Zygo Blaxell <bees@furryterror.org>