dcmds

rwlock ::rwlock

Given the address of a readers-writers lock (see rwlock(9F)), display the current state of the lock and the list of waiting threads.

[ address ] ::wchaninfo [-v]

Given the address of a condition variable (see condvar(9F)) or semaphore (see semaphore(9F)), display the current number of waiters on this object. If no explicit address is specified, display all such objects that have waiting threads. If the -v option is specified, display the list of threads that are blocked on each object.