Crate usync

This library provides implementations of Mutex, RwLock, Condvar, Barrier, and Once that are smaller and faster than those in the Rust standard library. It also provides a ReentrantMutex type.

Everything is powered by lock-free thread queues in userspace which allows the synchronization primitives to be 1 word (usize) large. All thread blocking is done through std::thread::park for maximum portability.

Re-exports

pub use ::lock_api;

Structs

Barrier

A barrier enables multiple threads to synchronize the beginning of some computation.

BarrierWaitResult

A BarrierWaitResult is returned by Barrier::wait() when all threads in the Barrier have rendezvoused.

Condvar

A Condition Variable

Once

A synchronization primitive which can be used to run a one-time initialization. Useful for one-time initialization for globals, FFI or related functionality.

RawMutex

Raw mutex type implemented with lock-free userspace thread queues.

RawRwLock

Raw rwlock type implemented with lock-free userspace thread queues.

RawThreadId

Implementation of the GetThreadId trait for lock_api::ReentrantMutex.

WaitTimeoutResult

A type indicating whether a timed wait on a condition variable returned due to a time out or not.

Enums

OnceState

Current state of a Once.

Functions

const_mutex

Creates a new mutex in an unlocked state ready for use.

const_reentrant_mutex

Creates a new reentrant mutex in an unlocked state ready for use.

const_rwlock

Creates a new instance of an RwLock<T> which is unlocked.

Type Definitions

MappedMutexGuard

An RAII mutex guard returned by MutexGuard::map, which can point to a subfield of the protected data.

MappedReentrantMutexGuard

An RAII mutex guard returned by ReentrantMutexGuard::map, which can point to a subfield of the protected data.

MappedRwLockReadGuard

An RAII read lock guard returned by RwLockReadGuard::map, which can point to a subfield of the protected data.

MappedRwLockWriteGuard

An RAII write lock guard returned by RwLockWriteGuard::map, which can point to a subfield of the protected data.

Mutex

A mutual exclusion primitive useful for protecting shared data

MutexGuard

An RAII implementation of a “scoped lock” of a mutex. When this structure is dropped (falls out of scope), the lock will be unlocked.

ReentrantMutex

A mutex which can be recursively locked by a single thread.

ReentrantMutexGuard

An RAII implementation of a “scoped lock” of a reentrant mutex. When this structure is dropped (falls out of scope), the lock will be unlocked.

RwLock

A reader-writer lock

RwLockReadGuard

RAII structure used to release the shared read access of a lock when dropped.

RwLockWriteGuard

RAII structure used to release the exclusive write access of a lock when dropped.