Killing an exec'ed process from another thread

Hi all,
I written an application that executes some external OS - processes. There is a dispatcher thread, that starts the execution threads for some jobs. Every execution thread creates a Processes by calling runtime.exec(), adds this object to a TreeMap ( member of the dispatcher ), creates two threads for reading the output of the process ( sdtout & stderr ) and calls p.waitFor(). From this moment this thread is blocked. After the process is done, the results will be processed by this thread etc. Now I want to go ahead and let the application user kill the process. For them I let the dispatcher - thread, that has also a reference to the executed process to call destroy of it if necessary during the execution thread is blocked by waitFor() and two output threads are reading stdout & stderr. The problem is however that destroy() - call from another thread doesn't kill the subprocess. The subprocess is running until it's done or terminated from out of jvm. Have you an idea or example?
Thanks a lot & regards
Alex

>
I know you have been discussing your problem is that
you can't kill a "sleep" process. But just to be
sure, I tested your description by one thread exec-ing
a "not-sleep" program, and then another thread had no
trouble killing it.
I took your code and wrote a program around it such
that
Thread1 :
- creates a Job (but not a "sleep" job); creates a
JobMap ; puts Job in JobMap
- starts Thread2 (passing it JobMap)
- sleeps 15 seconds
- calls Job.kill() (your method)
Thread2 :
- gets Job from JobMap
- calls Job.execute() (your method)
It's quick and dirty and sloppy, but it works. The
result is when the kill takes place, the execute
method (Thread2) wakes from its waitFor, and gets
exitValue() = 1 for the Process.
so,
In order to kill the sleep process, which (according
to BIJ) is not the Process that you have from exec
call, maybe the only way to kill it is to get its PID
an exec a "kill -9" on it, same as you said you had to
do from the commandline. I don't know if you can get
the PID, maybe you can get the exec-ed process to spit
it onto stdout or stderr?
(I am on win, not *nix, right now, so I am just
throwing out a suggestion before bowing out of this
discussion.)
/MelHi Mel,
yes, it should work right on windows because you created probably the shell by cmd /c or something like this. If you kill the cmd - process, everithing executed by the interpretter will be killed too. My application is running on Windows and unix. On unix I have to execute the process from a shell ( in my case it is the born shell ). The problem is however, that the born shell has another behaviour as cmd and doesn't die. Do you have an idea how to get the pid of the process started by sh without command line? To kill the processes from the command line is exactly what my customers do now. But they want to get "a better service" ...:-)
Regards
Alex

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