//! Thread synchronization primitives.
//!
//! * [`Parker`], a thread parking primitive.
//! * [`ShardedLock`], a sharded reader-writer lock with fast concurrent reads.
//! * [`WaitGroup`], for synchronizing the beginning or end of some computation.
//!
//! [`Parker`]: struct.Parker.html
//! [`ShardedLock`]: struct.ShardedLock.html
//! [`WaitGroup`]: struct.WaitGroup.html
pub use ;
pub use ;
pub use WaitGroup;