On 07/09/2010 15:14, Mark Hindess wrote:
In message<201009021351.o82dpaf1032...@d12av03.megacenter.de.ibm.com>,
Mark Hindess writes:
[SNIP]
There do seem to be problems though. Such as, if I run:
java
-Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=localhost:9900
-showversion HelloWorld
and then attach with:
/ri/jdk/bin/jdb -attach 9900
If I enter 'run' at the prompt I see "Hello World" output but then that
process hangs. It wouldn't surprise me if this and the problems you
are seeing are related.
I see the same behaviour on other recent milestones too.
Hmm . . . So I tried it again today and I didn't see the behaviour
on 6.0M2 and 6.0M1. It turns out if I type 'quit' in jdb before the
execution has "finished" then I don't get the hang but if the execution
has "finished" then it hangs.
So I thought this was a regression for a while but it turns out that is
down to my typing "quit" quicker this morning. (This may be an instance
of the socket problem that has an open JIRA where a blocking read is
not interrupted by a close on a different thread that we don't see when
GC is still running as USR2 signals are being generated regularly to
interrupt us.)
I see the same problem with the RI's jdb tool on Windows x86 in M1 and
M2. In windbg I see the stack trace points to the SelectRead() function
in JDWP. As you say, it is likely this is caused by a blocking socket
call being unable to be interruped.
I don't see this problem recreate when debugging with Eclipse or with
Harmony's jdb tool. I suspect this may be because they send a message
(maybe VM_DEATH) to the server side to tell it they are exiting, and
this causes JDWP to shutdown and exit rather than waiting for further
packets.
So, I see no regressions on jdwp or indeed java6 generally. What about
everyone else who raised issues? Any regressions/blockers?
I think this was the last issue that I felt might block the java 6
milestone. The other failures I see are not regressions.
Regards,
Oliver
-Mark.
--
Oliver Deakin
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