funcs [-adehlou] [directly] inverting lock ...

Lists only those functions that invert one or more of the specified locks. (See "Lock Inversions".) If directly is used, only those functions that themselves invert one or more of the locks (actually release them) are listed. If directly is not used, any function that is called with a lock already held, and then calls another function that inverts the lock, is also listed, and so on.

For example, in the following code, f3() directly inverts lock m, and f2() indirectly inverts it:

f1() { pthread_mutex_unlock(&m); f2(); pthread_mutex_lock(&m); }
f2() { f3(); }
f3() { pthread_mutex_unlock(&m); pthread_mutex_lock(&m); }