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The IDMAP term is normally associated with Winbind's idmap stuff.
These functions deal with id caching not id mapping.
Signed-off-by: Simo Sorce <idra@samba.org>
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We must leave the MSG_IDMAP_KILL operation in SMBD as it uses smbd
specific internal globals and makes sense only in the context of a smbd
daemon.
The rest is moved under lib/ as we need to deal with id cache cleanups
in other daemons too (like lsasd).
Signed-off-by: Simo Sorce <idra@samba.org>
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Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Simo Sorce <idra@samba.org>
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We have to be more careful when retiring children. We cannot stop
accepting connections as soon as the server tells us to quit because if
max_children is reached and we still have clients connected, the server will
not be able to spawn new children until one exits. And children will not exit
until all the clients closed the connections. So we keep operating past our
recall until we have 0 connections.
Also do not try to recall children that still have >= 1 clients connected, they
couldn't anyway.
Also use messaging to warn children and not SIGHUP.
Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Simo Sorce <idra@samba.org>
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Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Simo Sorce <idra@samba.org>
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Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Simo Sorce <idra@samba.org>
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Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Simo Sorce <idra@samba.org>
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Add a few util functions children side so that daemons do not have
to care about properly setting num_clients and state. Let a common
helper do it so that they are all consistent.
Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Simo Sorce <idra@samba.org>
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Children that are about to exit shouldn't be counted as a source of
connections, and also makes no sense to chenge their allowances if they are
about to exit.
Also children with negative num_clients are faulty, exclude them as well.
Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Simo Sorce <idra@samba.org>
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We can't have a clear idea of wether the worker is IDLE or BUSY.
The only things we can tell is if it is Alive, whether it is currently
Accepting connections or wether it is Exiting soon.
Remove PF_WORKER_IDLE, PF_WORKER_BUSY and replace their use with
PF_WORKER_ALIVE. Also properly assign PF_WORKER_ACCEPTING so that
users of the API can rely on the flag.
Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Simo Sorce <idra@samba.org>
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We used a lock mimicking what apache does for preforked children.
But it doesn't work properly in our case because we do not stop once a request
has been served. Clients are allowed to perform multiple requests and keep the
connection open.
This means that if we allow multiple clients per children, then a child could
take the lock and then be asked to do a long or even locking operation by a
client it already is serving. This woulkd cause the whole server to deadlock,
as the child is now busy and also holding on the lock.
Using a race on accept() by having a tevent_fd on the listening socket wait
for read events we never deadlock. At most we cause a bit of contention among
children. But in the generic case connections are much less frequent for us as
clients tend to be long lived. So the little contention we may have is not a
big deal.
Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Simo Sorce <idra@samba.org>
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Daemons using the prefork infrastructure may want to use these utils to
configure and manage a pool of children.
Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Simo Sorce <idra@samba.org>
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Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Simo Sorce <idra@samba.org>
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Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Simo Sorce <idra@samba.org>
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Autobuild-User: Jeremy Allison <jra@samba.org>
Autobuild-Date: Sat Aug 20 20:09:37 CEST 2011 on sn-devel-104
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get_cached_ldap_connect(), which much better describes it's function.
Now we always break at the right places in the loop, we can replace
the while (another_ldap_try(ldap_state, &rc, &attempts, abs_endtime))
construct with simply while (1).
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early out of the loop on success.
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functions that bracket the another_ldap_try() loop. We now never leave a
dangling alarm pending on success.
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lp_ldap_timeout() == 0.
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the LDAP timeout is zero.
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clustered. procid_is_me() is much cheaper to test and can optimize
up to 50% of the calls to serverid_exists(). Volker please check.
Autobuild-User: Jeremy Allison <jra@samba.org>
Autobuild-Date: Sat Aug 20 01:15:07 CEST 2011 on sn-devel-104
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* also log nesting transaction start/commit/cancel
* unify transaction log messages slightly
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termination is missing
Signed-off-by: Michael Adam <obnox@samba.org>
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termination is missing
Signed-off-by: Michael Adam <obnox@samba.org>
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Use the wrappers in util.h as they deal with trying to do the best they can on
platfroms that do not support mmap extensions.
Autobuild-User: Simo Sorce <idra@samba.org>
Autobuild-Date: Mon Aug 15 04:13:51 CEST 2011 on sn-devel-104
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This has been broken since ff0ac5b0 (May 2007).
Basically all messages were belonging to the General class except for CTDB
messages.
This fixed the message_send_all() function to correctly compute the class, and
fixes registrations to include all they need to cope with the fact not all
messages are of calss general (registrations rotted a bit because as long as
FLAG_MSG_GENERAL was defined the process woould receive all messages).
Signed-off-by: Andreas Schneider <asn@samba.org>
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The FLAG_MSG_PRINT_NOTIFY class is actually obsolete and never used, as the
only message belonging to it is not used either.
Signed-off-by: Andreas Schneider <asn@samba.org>
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Children Ids must start at 1 as 0 represent the father.
Also fix callbacks that restart logs to use a procedd global variable that
holds the Id so that they work correctly both fot the parent process and the
children.
Signed-off-by: Andreas Schneider <asn@samba.org>
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Signed-off-by: Andreas Schneider <asn@samba.org>
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Signed-off-by: Andreas Schneider <asn@samba.org>
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Pair-Programmed-With: Andreas Schneider <asn@samba.org>
Signed-off-by: Andreas Schneider <asn@samba.org>
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We need to properly handle preforked children so it is better to just do that
automatically.
If the parent needs/wants to intercept SIGCHLD events it can set a callback
that will be called by the prefork code once the internal cleanup function that
checks all prefork children has been executed.
Signed-off-by: Andreas Schneider <asn@samba.org>
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This way the parent doesn't need to know how to handle dead children and
keeps all of that within the prefork abstraction.
Signed-off-by: Andreas Schneider <asn@samba.org>
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Signed-off-by: Andreas Schneider <asn@samba.org>
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If this child has no clients, let the lock functions block for 1 second,
and then immediately reschedule the operation. This means we catch the lock
as soon as possible on a free child.
If, instead, we are already serving a client, we want to be non blocking,
so we timeout immediately on getting the lock, and then we sleep a 1/10th of
a second.
This means that a busy child will be slightly slower on picking up the lock,
but we won't block the existing client from communicating with us as we
immediately react to activity on the already opened file handler.
Signed-off-by: Andreas Schneider <asn@samba.org>
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Signed-off-by: Andreas Schneider <asn@samba.org>
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Signed-off-by: Andreas Schneider <asn@samba.org>
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Signed-off-by: Andreas Schneider <asn@samba.org>
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The allowed_clients var is a parent managed variable that tell children how
many clients they are allowed to handle at the same time. This way children
can overcommit but within parent controlled limits.
Signed-off-by: Andreas Schneider <asn@samba.org>
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To get a client connection it is now possible to use asynchronous functions.
Signed-off-by: Andreas Schneider <asn@samba.org>
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Primarily built for forked off rpc service daemons, but not tied to rpc
services and generic enough to be used elsewhere easily.
Signed-off-by: Andreas Schneider <asn@samba.org>
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Autobuild-User: Volker Lendecke <vlendec@samba.org>
Autobuild-Date: Wed Aug 10 18:10:39 CEST 2011 on sn-devel-104
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Ignore fd events without EVENT_FD_READ or EVENT_FD_WRITE also in
run_events_poll(). They are ignore when building the array
for the syscall in event_add_to_poll_args(), so we need to
ignore them run_events_poll() too.
metze
Signed-off-by: Andreas Schneider <asn@samba.org>
Autobuild-User: Stefan Metzmacher <metze@samba.org>
Autobuild-Date: Tue Aug 9 10:11:54 CEST 2011 on sn-devel-104
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registry.tdb
Signed-off-by: Michael Adam <obnox@samba.org>
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