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.

NewShardedMap returns a new ShardedMap with the given number of shards and sharding function.

NewWaitGroupChan returns a new single-use WaitGroupChan.

AtomicValue is the generic version of [atomic.Value].

Map is a Go map protected by a [sync.RWMutex].

Pool is the generic version of [sync.Pool].

Semaphore is a counting semaphore.

ShardedMap is a synchronized map[K]V, internally sharded by a user-defined K-sharding function.

WaitGroup is identical to [sync.WaitGroup], but provides a Go method to start a goroutine.

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