On Tue, 13 Nov 2001, Jose Alberto Fernandez <[EMAIL PROTECTED]>
wrote:
> From: "Stefan Bodewig" <[EMAIL PROTECTED]>
>
>> On Fri, 9 Nov 2001, Jose Alberto Fernandez
>> <[EMAIL PROTECTED]> wrote:
>>
>> > There are two issues here, first what to do with IO if not
>> > redirected;
>>
>> force it to /dev/null or NUL: or whatever - you cannot expect that
>> a detached process and Ant share the same IO streams IMHO.
>
> Well remember that in Ken escenario which was the one I used as the
> basis for the behaviour, the asynchonous process is *supposed* to
> finish before the VM ends, so things like being able to look at the
> IO being producced are fine.
It goes against my understanding of detached processes, but I could
live with it if it is really needed - it still is dangerous for many
BuildListeners to do so.
> What happens if you use all the threads management like Execute.java
> does? If you look at the patch, you will see that the process
> creation and lots of the other settings are performed outside of the
> deamon thread. It is only the process waitfor part and its
> surroundings that are done asynchronously.
OK, using
public static void main(String[] args) throws Throwable {
final Process p = Runtime.getRuntime().exec("xterm");
Thread t = new Thread() {
public void run() {
try {
p.waitFor();
} catch (Throwable e) {
e.printStackTrace();
}
}
};
t.setDaemon(true);
t.start();
}
it seems to work for JDK 1.3 and 1.4beta - JDK 1.1 still doesn't stop
the VM at all (and doesn't return control to the original shell) - I
guess there is a bug in the 1.1.8 VM that prevent stopping it when the
only threads left are daemon threads.
>> - but a java process [in JDK 1.4beta] keeps running, even after I
>> close the xterm.
I should add that this doesn't happen everytime I try it.
> Is it a "zombie" process by any chance?
Nope, "ps" didn't label them <defunct> like it would do on Linux.
> Any way you may know all this already.
;-)
> But why should only be your way.
Did I say so?
> We may need to rething a little and have some pseudo-task doing the
> daemon execution of the Thread.
That could help the BuildListeners, yes.
> No matter what we do, I think we will need to get a group of people
> with access to different OSs and JDKs to test is we can get some
> reliable behaviour as your tests have suggested.
Yes - I can provide Linux and FreeBSD-STABLE (not exactly stable JDK
1.2.2 only, as I try to not run in Linux emulation mode).
Stefan
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