If shm_rmid_force (the default state) is not set then the shmids are only
marked as orphaned and does not require any add, delete, or locking of the tree
structure.
Seperate the sysctl on and off case, and only obtain the read lock. The newly
added list head can be deleted under the read lock beca
If shm_rmid_force is not set then we only mark the shmids as orphaned and
do not lock, add, or delete any entries into the tree. This is also the
default state.
Seperate the sysctl on and off case, and only obtain the read lock. The
newly aded list head can be deleted uner the read lock because
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