DB- put blocking when database opened with DB_READ_UNCOMMITTED

Hi,
Please excuse me if I am missing something obvious, but is there any reason why a DB->put would block just because a database file is opened with the DB_READ_UNCOMMITTED?
I am using Berkeley DB 5.1.19 and I have been having some cursors block so I have added the DB_READ_UNCOMMITTED flag to my database file opens.
With the flag on the first time I try and put a record it just blocks indefinitely. When I remove the flag the put goes through no problem.
Gerard

I have been doing some testing on this and have found the following.
(1) I open the database with a DB_READ_UNCOMMITTED flag
(2) I create a cursor with the DB_READ_UNCOMMITTED flag and read the file
(3) I close the cursor with no problems (RC=0)
(4) I try a put operation and it blocks
(5) I run db_deadlock from the command line and the put returns DB_LOCK_DEADLOCK
If I change the cursor to be opened with DB_READ_COMMITTED I get the same situation.
If I comment out the DB_READ_UNCOMMITTED from the database open put does not block (as DB_READ_UNCOMMITTED is not honored for cursor if DB_READ_UNCOMMITTED is not specified for cursor).
If I remove the DB_READ_UNCOMMITTED or DB_READ_COMMITTED from the cursor the put also does not block.
From my reading the use of DB_READ_UNCOMMITTED should reduce the chance of a deadlock not guarantee a deadlock. Is this a bug or am I missing something.
BTW, the doco for cursor open says that DB_BULK is an option but there is no DB_BULK defined in db.h.
Any help greatly appreciated.
Gerard

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