Subj : Re: Can C++ local static objects be made thread safe?
To   : comp.programming.threads
From : Alexander Terekhov
Date : Sat Feb 19 2005 04:54 pm


Marcin 'Qrczak' Kowalczyk wrote:
[...]
> It can be turned off, but not because it might not work (it doesn't
> break correct programs): "Most users should leave this alone,
> but embedded programmers may want to disable this by specifying
> -fno-threadsafe-statics for a small savings in code size."

It saves not only code size. Useless syncronization is expensive
and shall be avoided as a matter of principle (apart from its
negative impact on performance). That's why making all static
locals synchronized "just in case" is totally brain-dead. They
should have provided a pragma, attribute, keyword, or something
like that to control it on per instance bases.

regards,
alexander.

.