Re: Singleton_pattern and Thread Safety
On Dec 11, 4:05 pm, "Chris M. Thomasson" <cris...@charter.net> wrote:
"Leigh Johnston" <le...@i42.co.uk> wrote in message
Hmm, I think I see why I might need the first barrier: is it
due to loads being made from the singleton object before the
pointer check causing problems for *clients* of the
function? any threading experts care to explain?
Basically, the only architecture out there which requires
a data-dependant acquire barrier after the initial atomic load
of the shared instance pointer is a DEC Alpha...
You must know something I don't: the documentation of the Sparc
architecture definitely says that it isn't guaranteed; I've also
heard that it fails on Itaniums, and that it is uncertain on
80x86. (My own reading of the Intel documentation fails to turn
up a guarantee, but I've not seen everything.)
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