thomaswhiteway / channel

Channel

The Channel class is similar to the queue.Queue class from the standard library, but with support for the receiving side detecting when all items to be sent over the channel have been received.

This is achieved by splitting sending (tx) and receiving (rx) sides of the channel into separate objects and allowing tx objects to be closed. rx objects know there are no further items to come once the channel is empty, and all tx objects for the channel have been closed.

Example

from channel import Channel
import threading

def sender(tx, items):
    with tx:
        for item in items:
            tx.put(item)

channel = Channel(50)

threads = [threading.Thread(target=sender,
                            args=(channel.tx(), range(range_start, range_end)))
           for range_start, range_end in zip(range(0,   1000, 100),
                                             range(200, 1200, 100))]

for thread in threads:
    thread.start()

for item in channel.rx():
    print(item)