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path: root/source3/lib/server_prefork.c
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2011-08-21s3-prefrok: Handle only valid childrenSimo Sorce1-4/+19
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>
2011-08-21s3-prefork: Fix worker flags handling.Simo Sorce1-5/+19
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>
2011-08-21s3-prefork: do not use a lock_fd, just race on accept()Simo Sorce1-370/+20
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>
2011-08-21s3-prefork: Allow better management of allowed_clientsSimo Sorce1-0/+32
Signed-off-by: Andreas Schneider <asn@samba.org> Signed-off-by: Simo Sorce <idra@samba.org>
2011-08-21s3-prefork: Fix cast warning.Andreas Schneider1-2/+2
Signed-off-by: Andreas Schneider <asn@samba.org> Signed-off-by: Simo Sorce <idra@samba.org>
2011-08-15s3-prefork: Do not use mmap/mremap/munmap directlySimo Sorce1-9/+11
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
2011-08-10s3-prefork: Fix use of child id.Simo Sorce1-2/+2
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>
2011-08-10s3-prefork: Pass the child a child_idSimo Sorce1-2/+2
Signed-off-by: Andreas Schneider <asn@samba.org>
2011-08-10s3-prefork: Return tsocket_address for client and serverSimo Sorce1-16/+51
Signed-off-by: Andreas Schneider <asn@samba.org>
2011-08-10s3-prefork: Pass messaging context around tooSimo Sorce1-3/+8
Pair-Programmed-With: Andreas Schneider <asn@samba.org> Signed-off-by: Andreas Schneider <asn@samba.org>
2011-08-10s3-prefork: Set up a SIGCHLD handler by defaultSimo Sorce1-3/+57
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>
2011-08-10s3-prefork: Provide a cleanup functionSimo Sorce1-9/+17
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>
2011-08-10s3-prefork: better timing out semanticsSimo Sorce1-4/+14
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>
2011-08-10s3-prefork: add support for multiple listning file descriptorsSimo Sorce1-81/+66
Signed-off-by: Andreas Schneider <asn@samba.org>
2011-08-10s3-prefork: provide way to send a signal to all childrenSimo Sorce1-0/+14
Signed-off-by: Andreas Schneider <asn@samba.org>
2011-08-10s3-prefork: provide means to expand the pool sizeSimo Sorce1-0/+32
Signed-off-by: Andreas Schneider <asn@samba.org>
2011-08-10s3-prefork: add way to manage number of clients per childSimo Sorce1-2/+33
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>
2011-08-10s3-prefork: add asynchronous functionsSimo Sorce1-1/+259
To get a client connection it is now possible to use asynchronous functions. Signed-off-by: Andreas Schneider <asn@samba.org>
2011-08-10s3-prefork: implement prefork frameworkSimo Sorce1-0/+502
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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