[boost] Re: [Boost.Thread] mutex Win32 implementation changes

From: Alexander Terekhov (terekhov_at_[hidden])
Date: 2004-05-15 11:40:13

Michael Glassford wrote:
> 
> I've just checked in changes to Win32 implementations of the mutex and
> recursive_mutex classes. They now use a Win32 critical section instead

MS critical section (current implementation) doesn't perform well 
if there is contention. They handoff ownership. You can build more 
efficient mutex (with all three lock/trylock/timedlock operations) 
using atomic swap/xchg and auto-reset event. It will work on 386
(no CAS required)... but I just can't stop scratching my head over 
mysterious lack of xchg.rel on Itanic (they only have xchg.acq).

regards,
alexander.