Why isn't the reference counter in boost::shared_ptr volatile?
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by Johann Gerell
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Published on 2010-03-26T11:02:27Z
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2010/03/26
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In the boost::shared_ptr destructor, this is done:
if(--*pn == 0)
{
boost::checked_delete(px);
delete pn;
}
where pn is a pointer to the reference counter, which is typedefed as
shared_ptr::count_type -> detail::atomic_count -> long
I would have expected the long to be volatile long, given threaded usage and the non-atomic 0-check-and-deletion in the shared_ptr destructor above. Why isn't it volatile?
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