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To: marc@bowtie.nl
Cc: erich@FreeBSD.org, freebsd-emulation@FreeBSD.org
Subject: Re: linux jdk on freebsd 
In-reply-to: Your message of "Sun, 27 Jul 1997 21:49:51 +0200."
             <199707271949.VAA24704@nietzsche.bowtie.nl> 
From: stephen farrell <stephen@farrell.org>
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Date: Mon, 28 Jul 1997 01:50:36 -0500
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>Yes, I saw it come by on the mailing list,
>
>Allthough I havent't tried it yet it seemed to be a problem in the 
>linux libraries (but this is from memory, I'll have to get back
>to you when I find the messages telling this)
>

>Did you try to install the latest linux-lib package from ports?


Yes... I've just been playing around with this some more.  It's
tantalizingly close to working beautifully--and noticeably faster than
it does under linux (!).


Basically we're working with the following:

steve byrne packaged up with 1.1.1-v3 libc.so.5.4.13, and
libdl.so.1.?.?  (he did not leave the version names on them, and
strings won't show me which libdl this is).  These reside in
jdk1.1.1/lib/i586/green_threads/, and are found by default unless you
rename them.

the latest linux_lib (2.4) includes libc.so.5.4.23 and
libdl.so.1.7.14.  (incidentally, either running "linux", or a note
that you need to do so before installing this port might be good.  I
was a little confused at first when it failed to run ldconfig)

Now, I can toggle between which of these is used by renaming the libs
in jdk1.1.1/lib/i586/green_threads/.  I find immediately that the
linux_lib libdl.so causes a "illegal instruction" error if I try to
use it.

It doesn't appear to matter much which libc I use... either one is
susceptible to the "pause hang".  This hang occurs rarely, but is
reproducible.  Sometimes it's more common, like when I was running the
trace below, the pause hang was more common.  It was particularly
reproducible, for example, in one program I can only get it to happen
if I try to open up a heirarchical list that takes a few seconds to
load under linux or solaris.

Here's a bit of a ktrace output, which appears to just repeat like
this indefinitely:

	http://www.farrell.org/stephen_paul/trace.html

--

Steve Farrell