Expand description
A multi-producer, single-consumer queue for sending values across asynchronous tasks.
Similar to std, channel creation provides Receiver and Sender
handles. Receiver implements Stream and allows a task to read values
out of the channel. If there is no message to read, the current task will be
notified when a new value is sent. Sender implements the Sink trait
and allows sending messages into the channel. If the channel is at capacity,
the send is rejected and the task will be notified when additional capacity
is available. In other words, the channel provides backpressure.
Unbounded channels are also available using the unbounded_channel
constructor.
Disconnection
When all Sender handles have been dropped, it is no longer
possible to send values into the channel. This is considered the termination
event of the stream. As such, Receiver::poll returns Ok(Ready(None)).
If the Receiver handle is dropped, then messages can no longer
be read out of the channel. In this case, all further attempts to send will
result in an error.
Clean Shutdown
When the Receiver is dropped, it is possible for unprocessed messages to
remain in the channel. Instead, it is usually desirable to perform a “clean”
shutdown. To do this, the receiver first calls close, which will prevent
any further messages to be sent into the channel. Then, the receiver
consumes the channel to completion, at which point the receiver can be
dropped.
Modules
Channel error types
Structs
Receive values from the associated Sender.
Send values to the associated Receiver.
Receive values from the associated UnboundedSender.
Send values to the associated UnboundedReceiver.
Functions
Create a bounded mpsc channel for communicating between asynchronous tasks, returning the sender/receiver halves.
Create an unbounded mpsc channel for communicating between asynchronous tasks.