Thank you very much for your review. - I have a TATAS lock implementation elsewhere: https://github.com/ademakov/MainMemory/blob/master/src/base/lock.h https:/

Thank you very much for your review. - I have a TATAS lock implementation elsewhere: https://github.com/ademakov/MainMemory/blob/master/src/base/lock.h https://github.com/ademakov/MainMemory/blob/master/src/base/... Could add it to Evenk as well. - Exchanged value in FutexLock is not discarded, it is used in the conditions of the `if` and `while` statements. In both cases the returned value of 0 means that we've got the lock and the next thing executed will be the `break` statement. If either value of 1 or 2 is returned then we need to proceed with spinning. The `if` condition relies on short-circuiting of || operator, so the exchange is only done if the `value` variable is equal to 1. If it were equal to 0 then the CAS in the for loop would have returned true leading to an early exit. The idea of using backoff before futex is picked from this article: http://locklessinc.com/articles/mutex_cv_futex/ http://locklessinc.com/articles/mutex_cv_futex/ The author suggests to spin a little in unlock as well, but I didn't go that far.