Is there a portable way to tell if data is available on a pipe?

[John Nagle]

I need some way to find out if a pipe has data available for
a read without blocking if it does not.

"select", unfortunately, doesn't work on pipes on Windows.

I think there's something proposed for Python 3000, but that's
not useful now.

I'd like to avoid having a thread to manage each pipe, but if I
have to, so be it.

John Nagle

 

[Scott David Daniels]

I need some way to find out if a pipe has data available for
a read without blocking if it does not. ....
I'd like to avoid having a thread to manage each pipe, but if I
have to, so be it.

Well, without granting your wish, put a Queue.Queue "in front" of
each pipe. The per-pipe thread reads a chunk, waiting if it has to,
and then writes to the queue. To read from a pipe w/o waiting from
one of these assemblies, you can use the get_nowait method on the
associated queue.

--Scott David Daniels
(e-mail address removed)

 

[John Nagle]

Well, without granting your wish, put a Queue.Queue "in front" of
each pipe. The per-pipe thread ...

That's what I thought. Oh, well.

John Nagle