Threading, commits, shared connection

Question

Have an applet with 2 threads sharing a connection, one is high
priority thread(T1), responds to user events, other is low
priority query thread (T2) that populates a display. Here is
sequence of events that causes problem (d1 and d2 are 2 separate
db tables):
Event 1 occurs,
T1 does the following:
select from d1 where account = 5 for update
update d1 set owner = me
commit
send message to T2 to query for more details and display
T2 does the following:
select from d2 where account = 5
process records from result set, write to display
wait for next message from T1
THEN, very soon after event 1 occurs, event 2 occurs,
T1 does the following:
select from d1 where account = 22 for update
update d2 set owner = me
commit
update d1 set owner = noone where account = 5
commit
Problem is this: the final commit hangs. And when I query the
db outside the applet, the d1 record associated with account 5 is
indeed locked (sqlplus hangs too on select for update!). It
looks like the original commit did not release the d1 record.
Possibilities:
1. Commit messes up other query statements on same connection.
2. Other query statements on same connection mess up commit.
3. Something else.
I am not using auto commit.
Any ideas?
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Answer 1

I'm not 100% sure what you mean, but I do know posting the same question within a few hours of each other is going to make people not want to respond.
- Anyhow, if you're saying a computer is connected to your files that you don't want you can simply unshare any files. (System Preferences>Sharing>uncheck "File Sharing")
If there is simply another computer listed under teh "Shared" section of finder, that isn't a big deal. They cannot access anything without you having shared the files, and vice versa. You may be able to click on that computer and look at their shared files, but odds are it'll come up "connection failed".
Is this at your home network? The office? A public wifi spot?
If it's your home network that means someone is connected to your wireless network. You should start by setting a password to access your wireless router. That is done differently depending on who manufactures your router. Consult their manual for advice there.
If you're on a public WiFi other computers will pop up, there really isn't anything you can do to "remove" them per-se. But I can assure you they cannot access anything on your computer unless you have shared the files under your "shared folder" (see the first point i made)
If you're at work/office/school it's the same deal. I'm looking at "shared" in Finder and there are 8-12 computers, none of which I know who they are. I cannot connect to any of them, if i try to it just says "Connection Failed". I'm not the most techy guy, but i believe you'll see any computer that is connect to the same network you are and has sharing activated (even if it's password protected).
If i'm missing what you're concerned about, let me know. Your question was worded pretty vaguely.