Non Blocking Channel Operations in Nim

import std/selectors
import std/asyncdispatch

proc main() =
  let messages = newChannel[string]()
  let signals = newChannel[bool]()

  # Here's a non-blocking receive. If a value is
  # available on `messages` then `select` will take
  # the `messages.recv()` case with that value. If not
  # it will immediately take the `else` case.
  select:
    case messages.recv(msg):
      echo "received message ", msg
    else:
      echo "no message received"

  # A non-blocking send works similarly. Here `msg`
  # cannot be sent to the `messages` channel, because
  # the channel has no buffer and there is no receiver.
  # Therefore the `else` case is selected.
  let msg = "hi"
  select:
    case messages.send(msg):
      echo "sent message ", msg
    else:
      echo "no message sent"

  # We can use multiple cases above the `else`
  # clause to implement a multi-way non-blocking
  # select. Here we attempt non-blocking receives
  # on both `messages` and `signals`.
  select:
    case messages.recv(msg):
      echo "received message ", msg
    case signals.recv(sig):
      echo "received signal ", sig
    else:
      echo "no activity"

main()

To run the program, save it as non_blocking_channel_operations.nim and use the Nim compiler:

$ nim c -r non_blocking_channel_operations.nim
no message received
no message sent
no activity

This example demonstrates non-blocking channel operations in Nim. The select statement is used to perform non-blocking operations on channels.

In Nim, we use the selectors and asyncdispatch modules to work with channels and asynchronous operations. The newChannel function creates a new channel, and the select statement is used for non-blocking operations.

The select statement in Nim works similarly to its counterpart, allowing you to specify multiple cases and an optional else clause for when no case is ready.

Note that Nim’s channel implementation might differ slightly from other languages, but the concept of non-blocking operations remains the same. Always refer to the Nim documentation for the most up-to-date and accurate information on using channels and asynchronous programming in Nim.

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Non Blocking Channel Operations in Nim