Boost logo

Boost Users :

Subject: Re: [Boost-users] [thread] variables in thread examples require 'volatile'?
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2009-12-07 19:56:21


Gabriel Redner wrote:
> I'm involved in a bit of a dispute in which a colleague is claiming
> that 'volatile' is necessary to make certain synchronization patterns
> correct. As part of my response I pointed out that the boost.thread
> examples don't use it, but he maintains his position - saying that the
> examples are flawed. I'm frankly somewhat out of my element here, and
> I'd like to get input from people who have presumably thought about
> this stuff a good deal.
> The example in question is here, under "synopsis":
> The claim is that 'volatile' is needed on the boolean, otherwise the
> compiler might cache the boolean in a register, and the loop would
> never exit. He cites for support two articles:
> Who's right?

volatile is not needed in that example because access is protected by a

In Christ,
Steven Watanabe

Boost-users list run by williamkempf at, kalb at, bjorn.karlsson at, gregod at, wekempf at