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It's a bit shocking how many references we have to global
contexts. Make this a bit more obvious.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This walks different code paths in the subsequent locker. And the one
that we did not test so far is in fact buggy
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Sat Nov 23 01:25:12 UTC 2019 on sn-devel-184
Now we have one fixed field for the exclusive lock holder and an array
of shared locks. This way we now prioritize writers over readers: If a
pending write comes in while readers are active, it will put itself
into the exclusive slot. Then it waits for the readers to vanish. Only
when all readers are gone the exclusive lock request is granted. New
readers will just look at the exclusive slot and see it's taken. They
will then line up as watchers, retrying whenever things change.
This also means that it will be cheaper to support many shared locks:
Granting a shared lock just means to extend the array. We don't have
to walk the array for possible conflicts.
This also adds explicit UPGRADE and DOWNGRADE operations for better
error checking.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
In the future, g_lock will not check for duplicate READ locks anymore,
as there might be many of them and the check might be expensive
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Soon the g_lock database format will change. There will be one
exclusive entry and an array of shared entries. In that format,
there's no need to attach a lock_type to each entry in the g_lock
database. Reflect this change in the g_lock_dump API
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This reflects that the messaging context is also used outside of the
server processes.
The command used for the rename:
find . -name '*.[hc]' -print0 | xargs -0 sed -i 's/server_messaging_context/global_messaging_context/'
Signed-off-by: Christof Schmitt <cs@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This reflects that the event context is also used outside of the server
processes.
The command used for the rename:
find . -name '*.[hc]' -print0 | xargs -0 sed -i 's/server_event_context/global_event_context/'
Signed-off-by: Christof Schmitt <cs@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
The fixes for #13195 were incomplete and did not cover upgrades
properly. It's all gone in master with the new code.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13195
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Autobuild-User(master): Volker Lendecke <vl@samba.org>
Autobuild-Date(master): Fri Aug 17 10:34:53 CEST 2018 on sn-devel-144
CLEAR_IF_FIRST doesn't really work in the cluster. This needs to be
applied to all tests, but lock6 is what I care about right now.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13195
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Do string_term_tdb_data just once, this is a leftover from a sweeping
change from "char *" to TDB_DATA as g_lock key.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13195
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
During development I had a bug that would have been found early
by this
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
