AssertLocked panics if m is not locked.

AssertRLocked panics if rw is not locked for reading or writing.

AssertWLocked panics if rw is not locked for writing.

ClosedChan returns a channel that's already closed.

NewSemaphore returns a semaphore with resource count n.

NewWaitGroupChan returns a new single-use WaitGroupChan.

Watch monitors mu for contention.

AtomicValue is the generic version of atomic.Value.

Semaphore is a counting semaphore.

WaitGroupChan is like a sync.WaitGroup, but has a chan that closes on completion that you can wait on.