Re: [boost] [interprocess] (OS X) waiting on condition variable = CPU 100% + fans running loud

Subject: Re: [boost] [interprocess] (OS X) waiting on condition variable = CPU 100% + fans running loud
From: Tim Blechmann (tim_at_[hidden])
Date: 2013-01-08 11:32:18

hi peter,

> Clang has std::atomic though, doesn't it? 

probably not unless you enable c++11. clang/c++11/osx does not work on
10.6 (it does not ship a c++11 compliant standard library) and
clang/c++11/linux doesn't have a working std::thread implementation.

> Actually, it seems to support the even better __atomic intrinsics:
> 
> http://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html

again, this requires gcc-4.7 ... what about people who are stuck at an
older compiler? apple/gcc is probably still shipping 4.2, which does not
even implement __sync primitives in a portable manner ...

of course, if the compiler implements std::atomic, there is absolutely
no need for boost::atomic in the first place ... the whole point is to
provide a compatibility layer to provide c++11-style atomics for old
compilers, that don't support c++11 atomics ... which, btw is one of the
reason why the original author decided to use inline assembly instead of
compiler intrinsics

tim