Re: C++0x static local initialization thread safety

=?ISO-8859-1?Q?Daniel_Kr=FCgler?= <>
Wed, 27 Apr 2011 05:35:33 CST
On 2011-04-27 02:26, Alexander Terekhov wrote:

Daniel Kr?gler wrote:

"If control enters the declaration concurrently while the variable
is being initialized, the concurrent execution shall wait for
completion of the initialization.[footnote]"

The above is defective in the sense that it doesn't allow to mark the
declaration (in)feasible for concurrent control entering and hence
requires all static locals to pay the overhead even if it is not needed
for a particular static local: that's not good.

AFAIK, the second argument was considered as weak, because a suggested
implementation technique as outlined in

and it's predecessors seemed to indicate that this potential overhead
should be insignificant.

Since you seem to disagree with this interpretation, do you have a
specific use-case where the current requirements would be rather
ill-advised and would prevent writing high-performance programs?

Thanks & Greetings from Bremen,

Daniel Kr?gler

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