[Mono-dev] Thread shutdown hook patch

[Rodrigo Kumpera]

Hey,

The attached patch adds a new hook to allow threads to shutdown after the GC
finalizer has finished.
The motivation for it is to improve profiler's reliability at shutdown time.

The new callback notifies the thread when regular shutdown starts and gives
it a change to not
finish at this time.

Later on the same callback is used to notify the thread that the last stage
in the shutdown sequence
has been reached and it must shutdown.

The callback is per-thread as I don't want to have tools like the profiler
messing up with embedded users.

Please review.


Cheers,
Rodrigo
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