Add semaphore and barrier

Author: Stjepan Glavina

Cargo.toml

@@ -13,5 +13,7 @@ categories = ["asynchronous", "concurrency"]
 readme = "README.md"
 
 [dependencies]
-async-mutex = "1.1.5"
-async-rwlock = "1.0.1"
+async-barrier = "1.0.0"
+async-mutex = "1.2.0"
+async-rwlock = "1.1.0"
+async-semaphore = "1.0.0"

src/lib.rs

@@ -1,14 +1,13 @@
 //! Async locking primitives.
 //!
-//! This crate provides two primitives:
+//! This crate provides the following primitives:
 //!
+//! * [`Barrier`] - enables tasks to synchronize all together at the same time.
 //! * [`Mutex`] - a mutual exclusion lock.
 //! * [`RwLock`] - a reader-writer lock, allowing any number of readers or a single writer.
+//! * [`Semaphore`] - limits the number of concurrent operations.
 
 #![warn(missing_docs, missing_debug_implementations, rust_2018_idioms)]
 
 #[doc(inline)]
-pub use {
-    async_mutex::{Mutex, MutexGuard},
-    async_rwlock::{RwLock, RwLockReadGuard, RwLockWriteGuard},
-};
+pub use {async_barrier::*, async_mutex::*, async_rwlock::*, async_semaphore::*};