this is in plain text (row level locks)

Iam trying to acquire rowlevel locks in postgresql. I try doing this:
'select * from students where name='Larry' for update;
But by looking at the holding array of proclock , I've noticed that by doing 
this only
AccessShareLock gets acquired which is a table level lock.
How do I acquire rowlevelock and what fields of Lock or Proclock 
datastructures indicate it.
Thanks
Jenny

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