Re: [boost] A fast-pathed rw-mutex algorithm for Boost...

From: Peter Dimov (pdimov_at_[hidden])
Date: 2006-10-26 21:20:57

Howard Hinnant wrote:

> Here is my implementation of Terekhov's *fair* read/write algorithm,
> with upgradable thrown in.  This algorithm is just as you say:  The
> OS alone decides who gets to run next.
>
> http://home.twcny.rr.com/hinnant/cpp_extensions/upgrade_mutex.html

I'm having trouble eliminating the notify_all from the unlock() "fast path". 
Under Windows, it is ridiculously expensive; all other algorithms run 
circles around it, even those that had errors in them. :-) Did you have an 
unconditional notify_all in your "real" unlock?