Flavors:

• Synchronous channels: Channel where send() can block. Limited capacity.
  • Mutex + Condvar + VecDeque
  • Atomic VecDeque (atomic queue) + thread::pack + thread::Thread::notify
• Asynchronous channels: Channel where send() cannot block. Unbounded.
  • Mutex + Condvar + VecDeque
  • Mutex + Condvar + LinkedList
  • AtomicLinkedList or Atomic Queue
  • Atomic linked list, linked list of T
  • Atomic block linked list, linked of atomic VecDeque
• Rendezvous channels: Synchronous with capacity = 0. Used for thread synchronization.
• Oneshot channels: Any capacity. In practice, only one call to send().