Hi,
I'm using the latest amalgation of sqlite on Windows NTFS, compiled with
SQLITE_THREADSAFE=1, from Visual C++.
I have two threads which update a database.
Each thread uses sqlite_open_v2 to open a connection.
Both threads do essentially this:
if BEGIN EXCLUSIVE TRANSACTION successful then {
INSERT INTO...
DELETE FROM...
COMMIT
}
In the scenario I'm facing thread A blocks (as expected) in the BEGIN
EXCLUSIVE CALL and waits.
Thread B successfully opens the exclusive transaction, but then fails with
SQLITE_BUSY in the INSERT INTO (in the step() function).
How can this be?
My wrapper class uses a busy handler, and waits for quite a long time for
the lock to unblock. But it never unblocks. And this is within a
successfully opened exclusive transaction.
As far as I understood the documentation, BEGIN EXCLUSIVE makes sure that no
other thread/process has locks open etc. If it returns success, other
operations from within the same thread using the same connection cannot fail
with SQLITE_BUSY...
What do I overlook here? I'm puzzling with this for two days now, but
without success...
Thanks in advance for your ideas.
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