[boost] [thread] "Intentional memory leak" removed

From: Roland Schwarz (roland.schwarz_at_[hidden])
Date: 2006-09-29 15:38:24

I finally managed to get rid of the "intentional memory leak" that was 
present in the tss code.

I used a reference counting technique, where the global data structures
(containing boost::function objects and boost::mutex) are freed after
last handler or destructor (whichever comes last) has been run.

Since the order when they are run is not guaranteed, the ref counting
approach should compensate for this.

I have checked this in to HEAD awaiting regression results.
I would be very glad if someone could do a review before commiting
this to RC_1_34_0 too.

I have to admit that the code does not look very beautiful, but my
intent was to get it correct, without changing the logic too much
to avoid introducing new bugs.

N.b.: The memory leak was a major annoyance on Windows, since it makes
debugging a lot harder there.

Regards,
Roland