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It doesn't fully work yet, and doesn't yet have all the efficiency
that is planned, but it doesn't break anything and I wanted to get the
code in the tree to minimise the chance of collisions with the work
metze is doing.
- VERSION: should contain the current version. Will be made part of the filename.
- SO_VERSION: should contain the latest version that this on is compatible to. Will be used for setting the soname of the shared library.
Fix sonames and use them on platforms that support them
Remove symlinking code. ldconfig will take care of creating the symlinks now
that we set the soname.
more agressively coalesce entries in the linked list of the undo
log. The second is to ensure that writes during a transaction into the
hash table don't cause the size of the undo log linked list to grow.
These optimisations don't affect Samba much, but they make a huge
difference to the use of ldb in kde
the difference between these at all, and in the future the
fact that INIT_OBJ_FILES include smb_build.h will be sufficient to
have recompiles at the right time.
This patch changes the way lsb_search is called and the meaning of the returned integer.
The last argument of ldb_search is changed from struct ldb_message to struct ldb_result
which contains a pointer to a struct ldb_message list and a count of the number of messages.
The return is not the count of messages anymore but instead it is an ldb error value.
I tryed to keep the patch as tiny as possible bu as you can guess I had to change a good
amount of places. I also tried to double check all my changes being sure that the calling
functions would still behave as before. But this patch is big enough that I fear some bug
may have been introduced anyway even if it passes the test suite. So if you are currently
working on any file being touched please give it a deep look and blame me for any error.
Simo.
to msync/mmap not changing the mtime of the file. This patch ensures
that for successfully completed transactions we update the mtime.
I don't do this on all tdb writes as its too expensive, but doing it
just on transactions is bearable, as those cost quite a lot anyway.
the transaction lock in tdb_traverse_read(). This prevents a pattern
of locks which triggers the deadlock detection code in solaris10. I
suspect solaris10 is trying to prevent lock starvation by granting
locks in the order they were requested, which makes it much easier to
produce deadlocks.
allowing searches to proceed while another process is in a
transaction, then only upgrading the transaction lock to a write lock
on commit.
The solution is:
- split tdb_traverse() into two calls, called tdb_traverse() and
tdb_traverse_read(). The _read() version only gets read locks, and
will fail any write operations made in the callback from the
traverse.
- the normal tdb_traverse() call allows for read or write operations
in the callback, but gets the transaction lock, preventing
transastions from starting inside the traverse
In addition we enforce the following rule that you may not start a
transaction within a traverse callback, although you can start a
traverse within a transaction
With these rules in place I believe all the deadlock possibilities are
removed, and we can now allow for searches to happen in parallel with
transactions
