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List:       linux-java
Subject:    Re: AttachCurrentThread()
From:       Nathan Meyers <nmeyers () javalinux ! net>
Date:       2000-01-25 20:07:29
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Jeff Galyan wrote:
> 
> Hi, Mark,
> 
> First, you might want to check out Sheng Liang's excellent book on JNI,
> titled "The Java Native Interface". Also, Nathan Meyers' book, "Java
> Programming on Linux" is an excellent resource for Linux-specific Java
> programming questions, and (I think) includes a chapter or two covering
> JNI and Linux-specific gotchas.

You won't find anything about four-thread limits in my book :-). This
sounds pretty weird - you might try hitting Ctrl-\ in the terminal
running the JVM: this'll give you a dump you can examine for monitor
contention.

Nathan


> 
> Between the two of those, you should have just about all your JNI
> questions covered! :)
> 
> --Jeff
> 
> Mark Delafranier wrote:
> >
> > Java Linux Buffs:
> >
> > I have a mutli-threaded application using pthreads, RedHat 6.1, gcc 2.91.66,
> > libc 2.1.2.  This is a standard RedHat 6.1 install with no patches or upgrades.
> >
> > I have searched through the www.blackdown.org faqs on using JNI and I did not
> > find anything helpfull for this problem.
> >
> > I application spawns various threads to deal with client requests, like a web
> > server would spawn threads to deal with http requests.  The main process
> > performs the JNI_CreateJavaVM() which succeeds.
> >
> > When a thread is started it issues an AttachCurrentThread and then proceeds with
> > its work.  I am finding that this method succeeds for 4 threads and then blocks
> > for other threads.
> >
> > Its like AttachCurrentThread is hanging or blocked on mutex of some sort.  The
> > same code works under Solaris and NT.
> >
> > Is there a limit to the number of threads that can be attached to the VM?
> >
> > BTW: I believe I have everything setup so that the vm properly uses
> > native_threads.
> >
> > Any suggestions?
> >
> > Thanks
> > Mark DeLaFranier.
> >
> > ----------------------------------------------------------------------
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> 
> --
> Jeff Galyan
> http://www.anamorphic.com
> http://www.sun.com
> jeffrey dot galyan at sun dot com
> talisman at anamorphic dot com
> Sun Certified Java(TM) Programmer
> ======================================================================
> Linus Torvalds on Microsoft and software development:
> "... if it's a hobby for me and a job for you, why are you doing such a
> shoddy job of it?"
> 
> The views expressed herein do not necessarily reflect those of my
> employer.
> 
> Sun Microsystems, Inc., has no connection to my involvement with the
> Mozilla Organization.
> 
> ----------------------------------------------------------------------
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