ping [PATCH] Fix a deadlock bug in static variable initialization in libsupc++

[Doug Kwan (關振德)]

Hi,

    I have sent this out in June.  Could someone please review this?
This patch fixes a deadlock problem in function scope static variable.
The current code there uses a big mutex for locking everything and the
mutex is acquired throughout the whole time a variable is being
initialized.  If the initalization code spawns and waits for another
another thread which needs to initialize another static variable, a
deadlock will result.  My fix is to use a bit per object for locking.
The bit is only accessed when the global mutex is acquired.  The mutex
is held only briefly.

Thanks.

-Doug
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