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This greatly reduces the fragmentation of databases where records
tend to grow slowly by a small amount each time. The case where this
is most seen is the ldb index records. Adding this overallocation
reduced the size of the resulting database by more than 20x when
running a test that adds 10k users.
The idea behind this is to recover from badly fragmented free
lists. Choosing the point where the file expands is fairly arbitrary,
but seems to work well.
During a transaction commit tdb normally uses fsync/msync calls to
make it crash safe. This can be disabled using the TDB_NOSYNC flag,
but it wasn't disabling all the code paths that caused a fsync/msync.
This is required because the deferred connect code skips the connect()
until sending the packet, but unless we catch this call, the connect()
never happens.
Andrew Bartlett
On my Linux box, this is definitely the more reliable strategy with unix domain
sockets, and according to my tests it also works correctly with TCP sockets.
A socket where the other side has closed only becomes readable. To catch
errors early when sitting in a pure writev, we need to also test for
readability.
This module didn't have any functionality that we actually used yet, and
it was quite small.
Tevent is quite low level and perhaps doesn't make much sense to expose
directly as a Python module. It was also causing build problems when used with a
system-tevent. We can always back later if necessary.
- Create separate macros for lock and unlock so that it's easier to identify
which request is being made.
- Initialize *ponce in the SMB_THREAD_ONCE macro in the non-thread-safe case,
rather than requiring each init function to determine if it's in the
non-thread-safe case and manually initialize.
Derrell
- This should make life easier for ourselves. We're no longer constrained to
the semantics of pthread_once, so let's allow passing a parameter to the
initialization function. Some of Samba's init functions return a
value. Although I haven't searched, I suspect that some of the init
functions require in input parameters. The parameter added here can be used
for input, output, or both, as necessary... or ignored, as is now done in
talloc_stackframe_init().
Derrell
- It would help if smb_thread_once did, eventually, set the variable that
prevents the init function from being run again. Sigh. It must be getting
late.
Derrell
