Luke Kenneth Casson Leighton
lkcl at samba.org
Tue Aug 15 08:07:38 GMT 2000
this is one of the reasons why the nt client runs threads. the dce/rpc
service is *expected* to be threaded to match, one-for-one, the number of
threads that the client requests [a BIND_ALTER_CONTEXT PDU is sent for
each thread required].
consequently, a single-process implementation such as spoolssd, is going
to run into problems.
this will require some form of "emulation" of threads, to fix in a
chris frank, of linuxcare, described an "IO Queue" mechanism that is used
in VMS, that would be suitable, that he has formerly implemented [in a
kernel] that could be reimplemented with shared memory. i suggested the
use of mmap'd tdb as a possible candidate to use.
although emulating a "queue" structure using a database is a bit of a
pain, as long as the number of entries in the "queue" are not exceeded by
the number of "worker threads" [in this case, each "thread" is actually a
process on the other side of the shared memory tdb], then the possibility
of an entry in the "queue" not being dealt with due to the "queue" not
having FILO properties does not occur.
also been talking to andrew about a possible diagnosis that lack of
threads in samba is causing a benchmark program where the NT SMB client
*is* threaded is causing similar "blocking" problems in the benchmark
On Mon, 14 Aug 2000, Gerald Carter wrote:
> Heads up....
> I found a bug in the HEAD branch printing code. When
> a remote printer in /etc/printcap is unavailable, trying
> to browse the Printers folder on the Samba server.
> The spoolss_notify_cjobs() (called as a result of
> api_spoolss_rfnpcnex()) forks and waits for the child
> to exit. However, when the printer is unable (remote one
> of course) the child hangs until it times out.
> I'm working on the code, but if someone has a
> quick fix....let me know.
> Cheers, jerry
> /\ Gerald (Jerry) Carter Professional Services
> \/ http://www.valinux.com VA Linux Systems gcarter at valinux.com
> http://www.samba.org SAMBA Team jerry at samba.org
> "...a hundred billion castaways looking for a home."
> - Sting "Message in a Bottle" ( 1979 )
<a href=" mailto:lkcl at samba.org" > Luke Kenneth Casson Leighton </a>
<a href=" http://cb1.com/~lkcl" > Samba and Network Development </a>
<a href=" http://samba.org" > Samba Web site </a>
ISBN1578701503 DCE/RPC over SMB: Samba and Windows NT Domain Internals
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