[Tracker] Search doesn't return anything while content being indexed

[Jimmy Huang <jimmy huang linux intel com>]

I noticed that search does not return any results while the system is
being indexed  (The search util came with tracker).  Is the SQLite
database being locked during indexing?  I was expecting that I can
search the content that has been indexed so far by the system.

If SQLite supports multi-reader/single writer architechure, if I extend
trackerd or write my own client that tries to have read only access the
SQLite database while it is being indexed, is there any issues?

Jimmy