pythonstacklesspython-stackless

In stackless Python, can you send a channel over a channel?

I do not have stackless currently running, so I can not try this myself.

import stackless
ch1 = stackless.channel()
ch2 = stackless.channel()

ch1.send(ch2)
ch3 = ch1.receive()

Are ch2 and ch3 then the same channel? Say:

text = "Hallo"
ch2.send(text)
assert text == ch3.receive()

This feature reminded me of a talk about Newsqueak that Robert Pike (of Plan9 fame) gave at Google. In Newsqueak you could send channels over channels.

Solution

  • Yes. Just tested.

    >>> import stackless
>>> ch1 = stackless.channel()
>>> def a():
...  ch2 = stackless.channel()
...  ch1.send(ch2)
...  ch2.send("Hello")
...
>>> def b():
...  ch3 = ch1.receive()
...  print ch3.receive()
...
>>> stackless.tasklet(a)()
<stackless.tasklet object at 0x01C6FCB0>
>>> stackless.tasklet(b)()
<stackless.tasklet object at 0x01C6FAB0>
>>> stackless.run()
Hello