Does it shutdown if you do this before the exit? (shutdown-agents)
On Thu, Apr 16, 2009 at 1:29 PM, Chas Emerick <cemer...@snowtide.com> wrote: > > I believe this is an issue related to how the threadpools used by > executors are populated by default, i.e. they use non-daemon threads. > > clojure.lang.Agent uses instances of these default threadpool > configurations, which is likely the cause of the delayed shutdown of > the JVM (I'll bet that if you let the process linger for a couple > minutes, the threadpools' timeouts will trip, the non-daemon threads > will die, and the process will exit gracefully). > > The solution would be for clojure.lang.Agent to create > ExecutorServices whose threadpools use a ThreadFactory that only > creates daemon threads. I don't really use agents though, so I'm not > at all in a position to write or test that patch (or be aware of what > other consequences might arise from having agents executing on daemon > threads -- I presume there aren't any, but...). > > - Chas > > On Apr 16, 12:25 pm, Drew Raines <aarai...@gmail.com> wrote: >> I have a command line utility that calls (exit 0) at the end of >> (-main). It looks like this: >> >> (defn exit [status] >> (shutdown-agents) >> (flush) >> (System/exit status)) >> >> Yet, despite this, the JVM never exits. Here is a snippet of jstack >> output: >> >> --8<---------------cut here---------------start------------->8--- >> "DestroyJavaVM" prio=10 tid=0x00000000406c7c00 nid=0x445d waiting on >> condition [0x0000000000000000..0x0000000041e48d10] >> java.lang.Thread.State: RUNNABLE >> >> Locked ownable synchronizers: >> - None >> >> "pool-1-thread-10" prio=10 tid=0x00007fd9744fac00 nid=0x447c waiting on >> condition [0x0000000042e58000..0x0000000042e58da0] >> java.lang.Thread.State: WAITING (parking) >> at sun.misc.Unsafe.park(Native Method) >> - parking to wait for <0x00007fd981140198> (a >> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) >> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158) >> at >> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925) >> at >> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358) >> at >> java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947) >> at >> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907) >> at java.lang.Thread.run(Thread.java:619) >> --8<---------------cut here---------------end--------------->8--- >> >> What else can I try to force everything to shut down? >> >> Thanks! >> >> -Drew >> >> jvm-hang.txt >> 11KViewDownload > > > -- R. Mark Volkmann Object Computing, Inc. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
