====== Usable lock implementation with SX-semantics ======

===== Technical contact =====
MaxLaier

===== Volunteers =====
DmitriyMarchenko
AttilioRao

===== Description =====

The current sx(9) implementation has several problems that make it unusable in many areas:
  * Might sleep (cv_wait) on the shared lock acquisition
  * implicit, hardcoded priority order without starvation protection
  * ...

Things to look at:
  * Solaris' rwlock
  * Use turnstiles instead of conditional variables
    * Priority propagation
    * No longer just one owner
    * shared/read locks might be acquired recursively

===== References =====
TBD