use key existence instead of value to indicate locking
use key existence instead of value to indicate locking

crchemist/scioncc,mkl-/scioncc,ooici/pyon,scionrep/scioncc,mkl-/scioncc,crchemist/scioncc,ooici/pyon,scionrep/scioncc,crchemist/scioncc,scionrep/scioncc,mkl-/scioncc