[m-dev.] Update boehm_gc to gc3.3alpha2

[Fergus Henderson]

On 27-Oct-2003, Peter Ross <pro at missioncriticalit.com> wrote:
> I would like to update boehm_gc collector to gc3.3alpha2 for the
> following fix
> 
>     Partially merged a win32 patch from Ben Hutchings, and substantially
>     revised other parts of win32_threads.c.  It had several problems.
>     Under MinGW with a statically linked library, the main thread was
>     not registered.  Cygwin detached threads leaked thread descriptors.
>     There were several race conditions.  For now, unfortunately the
>     static threads limit remains, though we increased it, and made table
>     traversal cost depend on the actual thread count.
>     There is also still some code duplication with pthread_support.c.
>     (Thread descriptors did become much smaller, since Ben Hutchings
>     removed the thread context from them.)
> 
>     plus some more Darwin fixes 
> 
> all of which are needed here at MC.
> 
> Are there any objections.

That's fine with me.

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
The University of Melbourne         |  of excellence is a lethal habit"
WWW: <http://www.cs.mu.oz.au/~fjh>  |     -- the last words of T. S. Garp.
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