Module sync

Available on crate feature __common only.

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.