Re: detail::atomic_counter

From: terekhov_at_[hidden]
Date: 2001-11-17 13:51:33

--- In boost_at_y..., "Peter Dimov" <pdimov_at_m...> wrote:
> In order to make shared_ptr thread safe (w.r.t. reference counting) 
we need
> an atomic_counter type, with the following operations defined:
> 
> atomic_counter a(n); // n is the initial value, convertible 
to 'long'
> ++a; // atomic increment, returns the new value (by value, 
type 'long')
> --a; // atomic decrement, returns the new value (by value, 
type 'long')
> a; // convertible to long, atomic read (to support use_count() and 
unique())
> 
> See below for a proposed implementation.
> 
> Comments are welcome.

info.

http://www.cs.umd.edu/~pugh/java/memoryModel/archive/0855.html
(Java: VOLATILE-ACQUIRE memory semantics == mutex.lock memory 
semantics; VOLATILE-RELEASE memory semantics == mutex.unlock 
memory semantics)

http://groups.google.com/groups?as_umsgid=3BC8463D.6E23002A%40web.de 
("READ MEMORY BARRIER" == mutex.lock memory semantics)

regards,
alexander.