Module sync

This module defines types which are thread safe if cfg!(feature = "concurrent") is true.

Lrc is an alias of either Rc or Arc.

Lock is a mutex. It internally uses parking_lot::Mutex if cfg!(parallel_queries) is true, RefCell otherwise.

RwLock is a read-write lock. It internally uses parking_lot::RwLock if cfg!(parallel_queries) is true, RefCell otherwise.

LockCell is a thread safe version of Cell, with set and get operations. It can never deadlock. It uses Cell when cfg!(parallel_queries) is false, otherwise it is a Lock.

MTLock is a mutex which disappears if cfg!(parallel_queries) is false.

MTRef is a immutable reference if cfg!(parallel_queries), and an mutable reference otherwise.

rustc_erase_owner! erases a OwningRef owner into Erased or Erased + Send + Sync depending on the value of cfg!(parallel_queries).

Structs

Lazy

A value which is initialized on the first access.

Lock

LockCell

Lrc

A thread-safe reference-counting pointer. ‘Arc’ stands for ‘Atomically Reference Counted’.

OnceCell

A thread-safe cell which can be written to only once.

RwLock

Traits

HashMapExt

Send

Types that can be transferred across thread boundaries.

Sync

Types for which it is safe to share references between threads.

Type Aliases

LockGuard

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

MappedLockGuard

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

MappedReadGuard

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

MappedWriteGuard

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

ReadGuard

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

WriteGuard

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