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Previously we could hang in poll with the callback pending (since we
fake it): explicitly call it immediately.
Note: I experienced corruption using DLIST_ADD_END (ctdb->pnn was blatted
when adding to the message_handler list). I switched them all to DLIST_ADD,
but maybe I'm using it wrong?
(This used to be ctdb commit 3727165f0d206999d2cfc2800ff8868640868c7c)
This is a bit tricky for those cases where we need to do multiple or
zero I/Os (eg. attachdb and readrecordlock), but works well for the
simple cases.
(This used to be ctdb commit ebe4dd724338c156423cfdcc10a75b68c2084cde)
This is a completely standalone library using only ctdb_protocol.h.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Header from folded patch 'libctdb-message-handling.patch':
libctdb: add message handling to libctdb.
Now clients can send and receive ctdb messages.
(This used to be ctdb commit 732cf6ead4aa2fbefc2b81328171f52c8d935341)
These simplifications mostly came up due to the implementation.
o Rename ctdb_context to ctdb_connection.
We already have a ctdb_context internally in ctdbd; don't confuse them!
o Rename ctdb_handle to struct ctdb_request.
From the user POV it's a request, and it's also useful internally to
avoid implicit cast to/from void *.
o Rename ctdb_db_context to ctdb_db.
o Introduce ctdb_lock.
This provides an explicit "lock object" you get from readrecordlock
and have to hand to those functions which need you to hold a lock.
o status args are "int" not int32_t.
Should this be a bool?
o Remove last traces on generic callback.
Without semi-sync API, this doesn't help anything and loses type safety.
o Remove the semi-async API.
We can add this later, but I think a sync and async API is enough for
our poor users for the moment :)
o Registering a message handler also takes a callback.
This way you can tell if it failed. Not sure if this is overkill, but it's
consistent.
o ctdb_service() takes an revents arg
Strictly not necessary for a nonblocking fd, but nice to know if a
read or write is possible.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
(This used to be ctdb commit 86e1f93df856f9627182ed0e18bfcff6866c0954)
This imports ctdb.h and tst.c from Ronnie's work: it's a separate commit
for now to make the changes obvious.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
(This used to be ctdb commit 09f05cbfc883e5aac33d3781b163cde178ece4cf)
