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

From: Michael Glassford (glassfordm_at_[hidden])
Date: 2004-05-15 12:49:49

Alexander Terekhov wrote:

> 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. 

So I've heard.

> They handoff ownership. You can build more 
> efficient mutex (with all three lock/trylock/timedlock operations) 
> using atomic swap/xchg and auto-reset event. 

I hope to look into this at some point, but for now have higher-priority 
items on my Boost.Threads task list.

Do you have a full-fledged implementation for such a beast? I remember 
you posting sample code some time back, but don't remember how complete 
it was.

 > 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.
> 
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