rotate the epoch bags and reclaim any objects retired two epochs ago.

Used by Harris Original and Maged-Harris TODO: change this to return orc_unsafe_internal_ptr<T> instead.

Set the value pointed to by ptr to the bits that represent the empty object.

debugging purposes, only works in quiescent state

debugging purposes, only works in quiescent state

debugging purposes, only works in quiescent state

debugging purposes, only works in quiescent state

Return a snapshot if the atomic_ptr_type supports it, otherwise perform a regular atomic load

Swaps the currently stored shared pointer with the given shared pointer. This operation does not affect the reference counts of either shared pointer.

Called only from retire()