Important bug fix in current trunk

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Hi all,

1- Please test the current trunk and report back any problem you have.
2- It might be a good idea to refresh your sandbox with trunk code if
   you are testing multi-threaded applications.

I have started, yesterday, to attack bug 172, a bug where an assertion
was raised when copying an object during GC.  This seems weird, as it
happened even with --enable-magic.  After a long debugging session
involving core dump investigation, I finally found that the problem was
due to a concurrency bug when threads competed on preparing a method.

To solve the problem, I had to change the content of stack frames, which
lead to widespread changes.  I suspect that this should also solve some
other problems that Greg, Chris, and Sebastien V. were experiencing with
random crashes sometime, when starting multi-threaded applications.

Have fun, and thanks for your help testing the code!

Etienne

PS:  For those working on non-x86 platforms, I have created a temporary
branch /sablevm/branches/sablevm-lgpl which include the fix (my primary
development platform being Debian/PowerPC).  [The AL20 license change
lead to removal of license-incompatible non-86 port code.  This should
be eventually resolved using the atomic_ops library.]

-- 
Etienne M. Gagnon, Ph.D.            http://www.info2.uqam.ca/~egagnon/
SableVM:                                       http://www.sablevm.org/
SableCC:                                       http://www.sablecc.org/

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