locks [-col] [directly] affected by func ...

Lists only those locks that may be affected (acquired, released, upgraded, or downgraded) as a result of calling the specified functions. If the keyword directly is used, only functions that use the threads library routines directly to affect a lock (acquire, release, upgrade, or downgrade) are listed. If the keyword directly is not used, any function that calls a function that affects a lock will be listed, and any function calling that function are listed, and so on.