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From: Peter Dimov (pdimov_at_[hidden])
Date: 2008-04-23 09:15:34

Anthony Williams:
> shared_mutex algorithms are *hard* to get right.

I'm now tending towards the opinion that rwlocks are hard to use correctly
(and test). For the 2R+1W case I've been testing, it occurs to me that the
writer wait time is normal - statistically, the time for the two readers to
finish their timeslices of 1ms is expected to be 0.75ms.

A (possibly?) better test would not have a dedicated writer thread, but
would use a pool of generic worker threads that alternate between reading
and writing with a certain probability. I may try one at some point.

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