...on apis that predate those kernel revisions. so, technically this might be able to run on xp. [*] GetThreadCookie optimization for all platforms
[+] IConditionMutex::TryLock() ... Timed is still too much of an ask for this interface, i think. There's a good reason as to why this isn't a iwaitable. This condvar interface must be as common and primitive as possible.
