Re: JPL Error With Thread.

On Fri, 17 Sep 1999, Larry Wall wrote:

> I don't believe that mixing Java threads and Perl threads is supported
> yet.  If you compile Perl without the Perl threads, then it just uses
> whatever Java thread happens to call it.

I managed to mix a threaded Perl with a threaded Java on Solaris, mainly
by moving -lthread to the front of the list of libraries when I linked
Perl.  Since I think (don't ask me where I got this idea, so don't quote
me as any sort of authority) that libpthread.so is a wrapper around
libthread.so, I think this might be OK.

I am pretty sure I posted something about this to p5p (via
[email protected]), but I don't follow p5p, so I'm not sure if there was
any followup on it.

In a nutshell, Sun recommends (er, demands) that you put -lthread first if
you plan to call Java, because it includes some functions that override
functions in libc.  It looked to me like Perl was loading other libraries
before libpthread, so the functions in libc weren't getting overwritten
(which made me wonder if this might cause problems for Perl itself).  
But, I really don't know - I'm a novice when it comes to this stuff.

In any case, there are instructions in the JPL README that let the AWT
test in JNI/test.pl put up a java.awt.Frame on Solaris 7 (but perhaps this
only works on one particular SPARC IPX sitting on one particular floor in
one particular house in Kingston, RI :-)

Brian Jepson * ([email protected])  *  http://users.ids.net/~bjepson