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The performance of these is minimal (these days) and they can return
invalid results when used as part of applications that do not use
sys_fork().
Autobuild-User: Jelmer Vernooij <jelmer@samba.org>
Autobuild-Date: Sat Mar 24 21:55:41 CET 2012 on sn-devel-104
This applies to all child processes making use of reinit_after_fork().
It is implemented by establishing a pipe between parent and child.
The child watches for EOF on the read end of the pipe, indidcating
an exited parent.
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
It's a bit confusing to mix low-level and high-level libraries. We had
multiple libraries in one directory, and there were have circular
dependencies with other libraries outside that directory (in this case,
samba-hostconfig).
Autobuild-User: Jelmer Vernooij <jelmer@samba.org>
Autobuild-Date: Sat Mar 10 23:13:01 CET 2012 on sn-devel-104
Because revoking read-only copies of records is expensive, we only
want ctdbd to do it for high-turnover records. A basic heuristic is
that if we don't find a local copy of the record, don't ask for a
read-only copy.
The fetch itself will cause ctdbd to migrate the record, so eventually
we will have a local copy. Next time it gets migrated away, we'll
call ctdbd_fetch() with local_copy = true.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
The new read-only record flags make determining if we can use a record
a bit more complex, so extract it into its own function.
The OLD logic was:
1) If the record doesn't exist, we can't use it.
2) If we are the dmaster for the record, we can use it.
The new logic is:
1) If the record doesn't exist, we can't use it.
2) If we are the dmaster for the record, we can use it IF we only
want read-only access, OR there are no read-only delegations.
3) If we are not dmaster, we can only use it if we want read-only
access and it is marked as a read-only copy.
This logic is unused until the next patches which begin to ask
for read-only copies of records.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
we were filling our logs with lock ordering debug lines
Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
Autobuild-User: Andrew Bartlett <abartlet@samba.org>
Autobuild-Date: Mon Feb 27 12:50:29 CET 2012 on sn-devel-104
