clib_spinlock_lock (&em->segment_handles_lock);
segment_idxp = hash_get (em->shared_segment_handles, segment_handle);
clib_spinlock_unlock (&em->segment_handles_lock);
clib_spinlock_lock (&em->segment_handles_lock);
segment_idxp = hash_get (em->shared_segment_handles, segment_handle);
clib_spinlock_unlock (&em->segment_handles_lock);