Re: [boost] rw_mutex

Anthony Williams wrote:

"Peter Dimov" <pdimov@mmltd.net> writes:

...

I have produced a read/write mutex implementation as a side effect, available at

http://www.pdimov.com/cpp/rw_mutex.cpp

that is lock-free when there is no contention (i.e. when a reader attempts a lock and no writers are active, or when a writer attempts a lock and the lock is free.)

wrlock() always locks not one, but *two* mutexes. I don't call that "lock free".

Yes, you are right, of course. Only rdlock() is lock-free when no writers are active.