Add some cross references to locking.9 from related pages.

share/man/man9/condvar.9

@@ -200,6 +200,7 @@ will fail if:
 Timeout expired.
 .El
 .Sh SEE ALSO
+.Xr locking 9 ,
 .Xr mtx_pool 9 ,
 .Xr mutex 9 ,
 .Xr rwlock 9 ,

share/man/man9/lock.9

@@ -272,7 +272,13 @@ exclusive lock, and a
 .Xr panic 9
 will be the result of trying.
 .Sh SEE ALSO
+.Xr condvar 9 ,
+.Xr mutex 9 ,
+.Xr locking 9 ,
+.Xr mutex 9 ,
+.Xr rwlock 9 ,
 .Xr sleep 9 ,
+.Xr sx 9 ,
 .Xr mtx_assert 9 ,
 .Xr panic 9 ,
 .Xr VOP_PRINT 9

share/man/man9/mtx_pool.9

@@ -177,6 +177,7 @@ on each mutex in the specified pool,
 deallocates the memory associated with the pool,
 and assigns NULL to the pool pointer.
 .Sh SEE ALSO
+.Xr locking 9
 .Xr mutex 9
 .Sh HISTORY
 These routines first appeared in

share/man/man9/mutex.9

@@ -510,6 +510,7 @@ No locks are needed when calling these functions.
 .Sh SEE ALSO
 .Xr condvar 9 ,
 .Xr LOCK_PROFILING 9 ,
+.Xr locking 9 ,
 .Xr mtx_pool 9 ,
 .Xr panic 9 ,
 .Xr rwlock 9 ,

share/man/man9/rwlock.9

@@ -215,6 +215,7 @@ Assert that current thread holds neither a shared nor exclusive lock of
 .El
 .El
 .Sh SEE ALSO
+.Xr locking 9 ,
 .Xr mutex 9 ,
 .Xr panic 9 ,
 .Xr sema 9 ,

share/man/man9/sema.9

@@ -125,6 +125,7 @@ Timeout expired.
 .El
 .Sh SEE ALSO
 .Xr condvar 9 ,
+.Xr locking 9 ,
 .Xr mtx_pool 9 ,
 .Xr mutex 9 ,
 .Xr rwlock 9 ,

share/man/man9/sleep.9

@@ -264,6 +264,7 @@ A non-zero timeout was specified and the timeout expired.
 .El
 .Sh SEE ALSO
 .Xr ps 1 ,
+.Xr locking 9 ,
 .Xr malloc 9 ,
 .Xr mi_switch 9 ,
 .Xr mtx_sleep 9 ,

share/man/man9/sx.9

@@ -222,6 +222,8 @@ lock while another thread blocked on the same
 lock after acquiring a mutex, then the second thread would effectively
 end up sleeping while holding a mutex, which is not allowed.
 .Sh SEE ALSO
+.Xr locking 9 ,
+.Xr lock 9 ,
 .Xr mutex 9 ,
 .Xr panic 9 ,
 .Xr rwlock 9 ,