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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>
Every time we accept a connection wanr the parent, so it can run management
routines and reallocate more resources if necessary.
Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Simo Sorce <idra@samba.org>
Also stop using the listening as now the prefork code properly sets
the PF_WORKER_ACCEPTING flag and it can be relied upon without having to keep
additional status around.
Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Simo Sorce <idra@samba.org>
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>
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>
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>
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>
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>
We were not properly managing allowed clients and pool management was
duplicated across a few callers.
Concentrate all management heuristics in one single function.
Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Simo Sorce <idra@samba.org>
Properly rotate log files in children by using a gloabl lsasd_child_id
variable.
Simplify code by using a global lsasd_pool variable, we can never use
more than one prefork pool in the same process anyway.
Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Simo Sorce <idra@samba.org>
Wtith this set of helper functions we make it easy to configure if we want to
use an embedded rpc server, or if we want to fork one. Or even just disable it
and let a third party server be used when the service is configured as
"external".
Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Simo Sorce <idra@samba.org>
