Re: [boost] boost lockfree queue.hpp - alternate implementation w/o compare_exchange

Subject: Re: [boost] boost lockfree queue.hpp - alternate implementation w/o compare_exchange
From: Giovanni Piero Deretta (gpderetta_at_[hidden])
Date: 2015-10-22 03:57:30

On 22 Oct 2015 3:26 a.m., <boost_at_[hidden]> wrote:
>>

>
> The yield can be removed without any ill effect except in cases of
over-subscription.  Without the yield performance is *very* poor because
the thread is forced to wait for other threads that aren't even running
(lines 355 & 378)...  Basically the yield is only a work-around for
something that is undesirable anyway (over-subsciption), but it limits the
'damage' in those scenarios.

It seems to me then it is not really lock free then, right?