[boost] Re: problem with shared_ptr

From: Alexander Terekhov (terekhov_at_[hidden])
Date: 2003-11-17 18:58:04

"Philippe A. Bouchard" wrote:
[...]
> Obviously the smart pointer will need to run on SPARC servers for

SPARC-RMO ("vaporware", AFAIK) and also "the" POWER (IBM) do have 
naked atomics and "disjoint" (with respect to atomics) load and 
store barriers (in various combination)... but, unfortunately, they 
are bidirectional load/store "fences" (that's way too heavy; for 
efficiency, you really need "hoist-only"/"sink-only" semantics in 
most cases), IIUC. 

> multithreaded environments.  It looked like shared_count_x86_exp2.cpp
> coudn't run on multiple platforms.

Yeah. refcount<> (and compilers with not-rocket-science knowledge 
of atomics with "hoist" and "sink" barriers... and that's no matter 
how screwed is the hardware -- compilers may reorder "as well") is 
the way to go. I guess.

http://groups.google.com/groups?selm=3F8128AD.344714AD%40web.de
http://groups.google.com/groups?selm=3F7AAF52.61390EA%40web.de

regards,
alexander.