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: Peter Dimov (lists_at_[hidden])
Date: 2013-01-06 17:59:52

Ion Gaztañaga wrote:
> Peter, very interesting, thanks for the hint, I'll add a ticket to avoid 
> missing it. There are quite a few gems hidden under smart_ptr: very 
> interesting the implementation of spinlock_xxx.hpp primitives, I'm not a 
> threading expert but I guess these are more efficient that current full 
> barrier atomic compare-exchange based interprocess primitives.
>
> Any chance to move those into boost/detail directory? These seem useful 
> outside smart_ptr (just like lightweight_mutex.hpp, interlocked.hpp, etc.)

These were in boost/detail at first, but I moved them into smart_ptr/detail 
so that it's clear to which library they belong; given that we'll be moving 
to separate repositories, this was obviously a good idea. :-)

For the spinlocks, the way forward is to use std::atomic_flag, and much of 
the other stuff is also obsoleted by the C++11 atomics. Unfortunately, I was 
unable to get yield(k) into the standard.